//! Interchange: camera-raw-settings (`crs:`) develop fields from XMP → our develop settings.
//!
//! Other raw developers store their edits as `crs:` properties in XMP sidecars, in DNG-embedded
//! XMP and in XMP preset files. This module maps the commonly used, documented-by-observation
//! fields to a *partial* [`DevelopSettings`](lightcraft_develop::DevelopSettings) JSON object
//! (only the fields present in the packet), which is then merged like a preset. Our pipeline is
//! not theirs, so the result is a best-effort approximation of the look, not a pixel match.
//! The full table is in `docs/xmp-interop.md`.
//!
//! Implemented from the public XMP specification (ISO 16684-1) and black-box observation of what
//! each field means; no third-party code or preset content was used.

use std::collections::BTreeMap;

use lightcraft_develop::{MIXER_BANDS, Preset};
use serde_json::{Map, Value, json};

/// Properties keyed `prefix:name` (as produced by [`lightcraft_meta::parse_xmp`]).
pub type Props = BTreeMap<String, Vec<String>>;

/// What the mapped settings will develop. It decides how a `crs:` white balance is read: a raw
/// with a Kelvin scale (colour matrices in the file, or measured for its camera) takes `Temperature`
/// as Kelvin; everything developed relative to its as-shot look (rendered files, and raws without
/// matrices anywhere, [`lightcraft_catalog::relative_wb_camera`]) needs a shift from the other app's
/// as-shot white instead, because on that scale 6500 K / 0 means *as shot* (issue #510).
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum Target {
    /// A preset: raw or rendered unknown. Absolute Kelvin first, else the relative scale.
    Any,
    /// A rendered photo (or a raw shown from its embedded preview): `Incremental*` fields on our
    /// relative scale.
    Rendered,
    /// A raw developed with an absolute white balance (DNG and other files with matrices, and raws
    /// whose camera has measured matrices): Kelvin as written.
    RawAbsolute,
    /// A raw developed relative to its as-shot look ([`lightcraft_catalog::Photo::relative_wb`]).
    RawRelative,
}

impl Target {
    /// The target for a file of this media kind and format (its extension or Lightroom's
    /// `fileFormat` name) shot on `camera` (Exif make and model as the catalog keeps them, or
    /// empty when unknown); `preview_only` for a raw that can't be decoded yet.
    pub fn for_file(kind: lightcraft_catalog::MediaKind, format: &str, preview_only: bool, camera: &str) -> Target {
        if kind != lightcraft_catalog::MediaKind::Raw || preview_only {
            Target::Rendered
        } else if lightcraft_catalog::relative_wb_camera(format, camera) {
            Target::RawRelative
        } else {
            Target::RawAbsolute
        }
    }
    /// The target for a photo in the catalog.
    pub fn for_photo(p: &lightcraft_catalog::Photo) -> Target {
        Target::for_file(p.kind, &p.format, p.preview_only.is_some(), &p.meta.camera)
    }
}

/// Band names as they appear in `crs:` field names, in our mixer order.
const CRS_BANDS: [&str; 8] = ["Red", "Orange", "Yellow", "Green", "Aqua", "Blue", "Purple", "Magenta"];

/// `crs:` fields that describe the packet rather than an adjustment.
const NON_ADJUSTMENT: &[&str] = &[
    "crs:Version",
    "crs:ProcessVersion",
    "crs:Name",
    "crs:ShortName",
    "crs:Group",
    "crs:UUID",
    "crs:PresetType",
    "crs:SupportsAmount",
    "crs:SupportsColor",
    "crs:SupportsMonochrome",
    "crs:SupportsHighDynamicRange",
    "crs:SupportsNormalDynamicRange",
    "crs:SupportsSceneReferred",
    "crs:SupportsOutputReferred",
    "crs:CameraModelRestriction",
    "crs:Copyright",
    "crs:ContactInfo",
    "crs:HasSettings",
    "crs:AlreadyApplied",
    "crs:RawFileName",
    "crs:HasCrop",
    // preset/library bookkeeping and tool options that don't change the rendering
    "crs:Cluster",
    "crs:SupportsAmount2",
    "crs:RequiresRGBTables",
    "crs:SortName",
    "crs:Description",
    "crs:CropConstrainToWarp",
    "crs:OverrideLookVignette",
    // the file's as-shot white, recorded next to the edit (ours comes from the file itself)
    "crs:AsShotTemperature",
    "crs:AsShotTint",
];

/// True if the packet carries any `crs:` adjustment (not just bookkeeping fields).
pub fn has_adjustments(props: &Props) -> bool {
    if props.get("crs:AlreadyApplied").and_then(|v| v.first()).is_some_and(|s| s.eq_ignore_ascii_case("true")) {
        // The pixels already contain these settings (e.g. an exported/rendered file).
        return false;
    }
    props.keys().any(|k| k.starts_with("crs:") && !NON_ADJUSTMENT.contains(&k.split('/').next().unwrap_or(k)))
}

thread_local! {
    /// Keys read by [`to_partial`] while [`to_partial_report`] runs.
    static READ: std::cell::RefCell<Option<std::collections::BTreeSet<String>>> = const { std::cell::RefCell::new(None) };
    /// Adjustments [`to_partial`] read but deliberately left out, for the report.
    static SKIPPED: std::cell::RefCell<Option<Vec<String>>> = const { std::cell::RefCell::new(None) };
}

fn note(k: &str) {
    READ.with(|r| {
        if let Some(s) = r.borrow_mut().as_mut() {
            s.insert(k.to_string());
        }
    });
}

fn skipped(what: &str) {
    SKIPPED.with(|r| {
        if let Some(s) = r.borrow_mut().as_mut() {
            s.push(what.to_string());
        }
    });
}

fn first<'a>(props: &'a Props, k: &str) -> Option<&'a str> {
    note(k);
    props.get(k).and_then(|v| v.first()).map(|s| s.trim()).filter(|s| !s.is_empty())
}

fn num(props: &Props, k: &str) -> Option<f64> {
    let s = first(props, k)?;
    let s = s.strip_prefix('+').unwrap_or(s);
    if let Some((n, d)) = s.split_once('/') {
        let (n, d) = (n.trim().parse::<f64>().ok()?, d.trim().parse::<f64>().ok()?);
        return (d != 0.0).then_some(n / d).filter(|v| v.is_finite());
    }
    s.parse::<f64>().ok().filter(|v| v.is_finite())
}

fn boolean(props: &Props, k: &str) -> Option<bool> {
    first(props, k).map(|s| s.eq_ignore_ascii_case("true") || s == "1")
}

/// Insert `v` at the dotted `path` of a JSON object, creating intermediate objects.
fn put(out: &mut Value, path: &str, v: Value) {
    let mut cur = out;
    let mut parts = path.split('.').peekable();
    while let Some(p) = parts.next() {
        let Value::Object(m) = cur else { return };
        if parts.peek().is_none() {
            m.insert(p.to_string(), v);
            return;
        }
        cur = m.entry(p.to_string()).or_insert_with(|| Value::Object(Map::new()));
    }
}

/// Relative temperature (−100..100, used for rendered files) → Kelvin, matching the UI's scale
/// (a mired shift around 6500 K).
pub fn rel_to_kelvin(r: f64) -> f64 {
    1e6 / (1e6 / 6500.0 - r.clamp(-100.0, 100.0) * 0.8)
}

/// Parse a point curve stored as an `rdf:Seq` of `"x, y"` strings in 0..255.
fn curve(props: &Props, k: &str) -> Option<Value> {
    note(k);
    let items = props.get(k)?;
    let mut pts = Vec::new();
    for it in items {
        let (x, y) = it.split_once(',')?;
        // (`parse` reads "NaN" and "inf" too: a curve with such a point is not a curve)
        let (x, y) = (x.trim().parse::<f64>().ok().filter(|v| v.is_finite())?, y.trim().parse::<f64>().ok().filter(|v| v.is_finite())?);
        pts.push(json!({"x": (x / 255.0).clamp(0.0, 1.0), "y": (y / 255.0).clamp(0.0, 1.0)}));
    }
    if pts.len() < 2 {
        return None;
    }
    // A straight 0,0 → 255,255 line is the identity: store it as "no curve".
    let identity = pts.len() == 2 && items.iter().all(|it| it.split(',').map(|v| v.trim()).collect::<Vec<_>>().windows(2).all(|w| w[0] == w[1]));
    Some(if identity { json!([]) } else { Value::Array(pts) })
}

/// Map the `crs:` fields of an XMP packet to a partial develop-settings JSON object.
///
/// `target` decides how the white balance is read (see [`Target`]).
pub fn to_partial(props: &Props, target: Target) -> Value {
    let mut out = Value::Object(Map::new());
    let o = &mut out;
    let n = |o: &mut Value, crs: &str, path: &str| {
        if let Some(v) = num(props, &format!("crs:{crs}")) {
            put(o, path, json!(v));
        }
    };
    // ---- Light (process version 2012+ names)
    n(o, "Exposure2012", "light.exposure");
    n(o, "Contrast2012", "light.contrast");
    n(o, "Highlights2012", "light.highlights");
    n(o, "Shadows2012", "light.shadows");
    n(o, "Whites2012", "light.whites");
    n(o, "Blacks2012", "light.blacks");
    // Lightroom's Light panel "HDR" button
    if let Some(on) = boolean(props, "crs:HDREditMode") {
        put(o, "hdr.enabled", json!(on));
    }
    // older process versions (most `.lrtemplate` presets): approximate the 2012 sliders from the
    // earlier ones, relative to their defaults (contrast 25, blacks 5, brightness 50)
    let has = |o: &Value, path: &str| path.split('.').try_fold(o, |v, k| v.get(k)).is_some();
    // presets written by newer versions keep the old fields at their defaults: ignore them there
    let pv2012 = props.keys().any(|k| k.ends_with("2012"));
    let old = |o: &mut Value, crs: &str, path: &str, f: &dyn Fn(f64) -> f64| {
        let v = num(props, &format!("crs:{crs}"));
        if !pv2012
            && !has(o, path)
            && let Some(v) = v
        {
            put(o, path, json!(f(v).clamp(-100.0, 100.0)));
        }
    };
    old(o, "Exposure", "light.exposure", &|v| v);
    old(o, "Contrast", "light.contrast", &|v| v - 25.0);
    old(o, "HighlightRecovery", "light.highlights", &|v| -v);
    old(o, "FillLight", "light.shadows", &|v| v);
    old(o, "Shadows", "light.blacks", &|v| -(v - 5.0) * 4.0);
    old(o, "Brightness", "light.whites", &|v| (v - 50.0) * 0.6);
    // ---- Presence
    n(o, "Texture", "effects.texture");
    n(o, "Clarity2012", "effects.clarity");
    old(o, "Clarity", "effects.clarity", &|v| v);
    n(o, "Dehaze", "effects.dehaze");
    n(o, "Vibrance", "color.vibrance");
    n(o, "Saturation", "color.saturation");

    // ---- White balance
    let mode = first(props, "crs:WhiteBalance").map(|m| match m.to_ascii_lowercase().replace(' ', "").as_str() {
        "asshot" => "asShot",
        "auto" => "auto",
        "daylight" => "daylight",
        "cloudy" => "cloudy",
        "shade" => "shade",
        "tungsten" => "tungsten",
        "fluorescent" => "fluorescent",
        "flash" => "flash",
        _ => "custom",
    });
    let abs = num(props, "crs:Temperature").map(|t| (t, num(props, "crs:Tint")));
    let rel = num(props, "crs:IncrementalTemperature")
        .or(num(props, "crs:IncrementalTint").map(|_| 0.0))
        .map(|t| (rel_to_kelvin(t), num(props, "crs:IncrementalTint")));
    // A Kelvin value for something we develop relative to its as-shot look: the other app's
    // as-shot white (`AsShotTemperature` / `AsShotTint`, written next to the edit) is the
    // reference, so the edit is the same mired shift from ours (issue #510).
    let shifted = || {
        let (t, tint) = abs?;
        let as_shot = num(props, "crs:AsShotTemperature").filter(|k| *k > 0.0)?;
        if t <= 0.0 {
            return None;
        }
        let r = (1e6 / as_shot - 1e6 / t) / 0.8;
        let tint = tint.map(|v| v - num(props, "crs:AsShotTint").unwrap_or(0.0));
        Some((rel_to_kelvin(r), tint))
    };
    let wb = match target {
        Target::RawAbsolute => abs,
        Target::Any => abs.or(rel),
        Target::Rendered => rel.or_else(shifted).or(abs),
        Target::RawRelative => rel.or_else(shifted),
    };
    match (mode, wb) {
        (Some(m), _) if m != "custom" => put(o, "wb.mode", json!(m)),
        (m, Some((t, tint))) => {
            put(o, "wb.mode", json!(m.unwrap_or("custom")));
            put(o, "wb.temp", json!(t));
            if let Some(tint) = tint {
                put(o, "wb.tint", json!(tint));
            }
            // Kelvin as the other app wrote it: say so, so the value stays Kelvin on a raw with that scale (a
            // preset's Kelvin is read as the relative scale on the files that have only that, as before)
            if wb == abs && matches!(target, Target::RawAbsolute | Target::Any) {
                put(o, "wb.scale", json!("kelvin"));
            }
        }
        // a custom Kelvin with nothing to shift it from: read on the relative scale it would be a
        // large colour shift (ΔE 22 against Lightroom's export on the photos of issue #510), so
        // the photo stays As Shot (ΔE 12 there) and the report says so
        (_, None) if target == Target::RawRelative && abs.is_some() => {
            put(o, "wb.mode", json!("asShot"));
            skipped("Temperature, Tint (custom white balance without AsShotTemperature: kept As Shot)");
        }
        (Some(m), None) => put(o, "wb.mode", json!(m)),
        (None, None) => {}
    }

    // ---- Treatment + B&W mix
    if let Some(bw) = boolean(props, "crs:ConvertToGrayscale") {
        put(o, "treatment", json!(if bw { "bw" } else { "color" }));
    }
    for (band, crs) in MIXER_BANDS.iter().zip(CRS_BANDS) {
        n(o, &format!("HueAdjustment{crs}"), &format!("mixer.{band}.hue"));
        n(o, &format!("SaturationAdjustment{crs}"), &format!("mixer.{band}.sat"));
        n(o, &format!("LuminanceAdjustment{crs}"), &format!("mixer.{band}.lum"));
        n(o, &format!("GrayMixer{crs}"), &format!("bw_mix.{band}"));
    }

    // ---- Tone curve: parametric regions + point curves
    n(o, "ParametricShadows", "curve.shadows");
    n(o, "ParametricDarks", "curve.darks");
    n(o, "ParametricLights", "curve.lights");
    n(o, "ParametricHighlights", "curve.highlights");
    n(o, "ParametricShadowSplit", "curve.split_shadows");
    n(o, "ParametricMidtoneSplit", "curve.split_mid");
    n(o, "ParametricHighlightSplit", "curve.split_highlights");
    n(o, "CurveRefineSaturation", "curve.refine_saturation");
    if let Some(c) = curve(props, "crs:ToneCurve").filter(|c| c.as_array().is_some_and(|a| !a.is_empty())) {
        // the older single curve, used when no 2012 curve is present
        if !props.contains_key("crs:ToneCurvePV2012") {
            put(o, "curve.master", c);
        }
    }
    // Lightroom Classic reads the red / green / blue curves only when the packet holds the master
    // 2012 curve and all three channel curves (as its own packets always do): a packet missing any
    // of them imports without channel curves (master + red, master + red + green, or red / green /
    // blue without the master all leave the photo's channels unchanged there)
    if let Some(c) = curve(props, "crs:ToneCurvePV2012") {
        put(o, "curve.master", c);
        let channels = [("ToneCurvePV2012Red", "red"), ("ToneCurvePV2012Green", "green"), ("ToneCurvePV2012Blue", "blue")]
            .map(|(crs, ch)| (curve(props, &format!("crs:{crs}")), ch));
        if channels.iter().all(|(c, _)| c.is_some()) {
            for (c, ch) in channels {
                if let Some(c) = c {
                    put(o, &format!("curve.{ch}"), c);
                }
            }
        }
    }

    // ---- Color grading (split toning fields are shared with the older split-toning panel)
    n(o, "SplitToningShadowHue", "grading.shadows.hue");
    n(o, "SplitToningShadowSaturation", "grading.shadows.sat");
    n(o, "ColorGradeShadowLum", "grading.shadows.lum");
    n(o, "SplitToningHighlightHue", "grading.highlights.hue");
    n(o, "SplitToningHighlightSaturation", "grading.highlights.sat");
    n(o, "ColorGradeHighlightLum", "grading.highlights.lum");
    n(o, "ColorGradeMidtoneHue", "grading.midtones.hue");
    n(o, "ColorGradeMidtoneSat", "grading.midtones.sat");
    n(o, "ColorGradeMidtoneLum", "grading.midtones.lum");
    n(o, "ColorGradeGlobalHue", "grading.global.hue");
    n(o, "ColorGradeGlobalSat", "grading.global.sat");
    n(o, "ColorGradeGlobalLum", "grading.global.lum");
    n(o, "ColorGradeBlending", "grading.blending");
    n(o, "SplitToningBalance", "grading.balance");

    // ---- Detail
    n(o, "Sharpness", "detail.sharpen_amount");
    n(o, "SharpenRadius", "detail.sharpen_radius");
    n(o, "SharpenDetail", "detail.sharpen_detail");
    n(o, "SharpenEdgeMasking", "detail.sharpen_masking");
    n(o, "LuminanceSmoothing", "detail.nr_luminance");
    n(o, "LuminanceNoiseReductionDetail", "detail.nr_detail");
    n(o, "LuminanceNoiseReductionContrast", "detail.nr_contrast");
    n(o, "ColorNoiseReduction", "detail.nr_color");
    n(o, "ColorNoiseReductionDetail", "detail.nr_color_detail");
    n(o, "ColorNoiseReductionSmoothness", "detail.nr_color_smoothness");

    // ---- Effects: post-crop vignette + grain
    n(o, "PostCropVignetteAmount", "vignette.amount");
    n(o, "PostCropVignetteMidpoint", "vignette.midpoint");
    n(o, "PostCropVignetteRoundness", "vignette.roundness");
    n(o, "PostCropVignetteFeather", "vignette.feather");
    n(o, "PostCropVignetteHighlightContrast", "vignette.highlights");
    if let Some(st) = num(props, "crs:PostCropVignetteStyle") {
        let style = match st as i64 {
            2 => "colorPriority",
            3 => "paintOverlay",
            _ => "highlightPriority",
        };
        put(o, "vignette.style", json!(style));
    }
    n(o, "GrainAmount", "grain.amount");
    n(o, "GrainSize", "grain.size");
    n(o, "GrainFrequency", "grain.roughness");

    // ---- Optics (manual corrections; lens profiles are ours, only the switch carries over).
    // Our profile corrections are the file's own (DNG-embedded) ones, which Lightroom applies
    // whatever its "Enable Profile Corrections" box says [inferred]: so only an enabling switch
    // carries over, and `LensProfileEnable=0` (the default in most presets) leaves ours as it is.
    if boolean(props, "crs:LensProfileEnable") == Some(true) {
        put(o, "optics.lens_profile", json!(true));
    }
    if let Some(b) = boolean(props, "crs:AutoLateralCA") {
        put(o, "optics.remove_ca", json!(b));
    }
    n(o, "LensManualDistortionAmount", "optics.distortion");
    n(o, "VignetteAmount", "optics.vignetting");
    n(o, "VignetteMidpoint", "optics.vignetting_midpoint");
    n(o, "DefringePurpleAmount", "optics.defringe_purple_amount");
    n(o, "DefringePurpleHueLo", "optics.defringe_purple_hue_lo");
    n(o, "DefringePurpleHueHi", "optics.defringe_purple_hue_hi");
    n(o, "DefringeGreenAmount", "optics.defringe_green_amount");
    n(o, "DefringeGreenHueLo", "optics.defringe_green_hue_lo");
    n(o, "DefringeGreenHueHi", "optics.defringe_green_hue_hi");

    // ---- Calibration
    n(o, "ShadowTint", "calibration.shadows_tint");
    n(o, "RedHue", "calibration.red_hue");
    n(o, "RedSaturation", "calibration.red_sat");
    n(o, "GreenHue", "calibration.green_hue");
    n(o, "GreenSaturation", "calibration.green_sat");
    n(o, "BlueHue", "calibration.blue_hue");
    n(o, "BlueSaturation", "calibration.blue_sat");

    // ---- Geometry
    n(o, "PerspectiveVertical", "geometry.vertical");
    n(o, "PerspectiveHorizontal", "geometry.horizontal");
    n(o, "PerspectiveRotate", "geometry.rotate");
    n(o, "PerspectiveScale", "geometry.scale");
    n(o, "PerspectiveAspect", "geometry.aspect");
    n(o, "PerspectiveX", "geometry.offset_x");
    n(o, "PerspectiveY", "geometry.offset_y");
    if let Some(u) = num(props, "crs:PerspectiveUpright") {
        let mode = match u as i64 {
            1 => "auto",
            2 => "level",
            3 => "vertical",
            4 => "full",
            5 => "guided",
            _ => "off",
        };
        put(o, "geometry.upright", json!(mode));
    }

    // ---- Crop (normalized edges of the unrotated image + straighten angle)
    match boolean(props, "crs:HasCrop") {
        Some(true) => {
            let e = |k: &str, d: f64| num(props, &format!("crs:Crop{k}")).unwrap_or(d).clamp(0.0, 1.0);
            let (l, t, r, b) = (e("Left", 0.0), e("Top", 0.0), e("Right", 1.0), e("Bottom", 1.0));
            if r > l && b > t {
                put(
                    o,
                    "crop.geometry",
                    json!({"rect": {"x0": l, "y0": t, "x1": r, "y1": b}, "angle": num(props, "crs:CropAngle").unwrap_or(0.0).clamp(-45.0, 45.0)}),
                );
            }
        }
        Some(false) => put(o, "crop.geometry", json!({"rect": {"x0": 0.0, "y0": 0.0, "x1": 1.0, "y1": 1.0}, "angle": 0.0})),
        None => {}
    }
    out
}

/// [`to_partial`], plus the adjustments in the packet it could not carry over (field names
/// without the `crs:` prefix, grouped: `CameraProfile`, `Look`, `MaskGroupBasedCorrections`…).
///
/// With `values` (the packet's structured properties), local corrections become masks too
/// ([`crate::crs_masks`]; radial masks fitted to `aspect` = width / height); components that
/// can't be carried over are reported as `Mask: <kind>`.
pub fn to_partial_report(props: &Props, values: Option<&crate::crs_masks::Values>, target: Target, aspect: f64) -> (Value, Vec<String>) {
    READ.with(|r| *r.borrow_mut() = Some(Default::default()));
    SKIPPED.with(|r| *r.borrow_mut() = Some(Vec::new()));
    let mut out = to_partial(props, target);
    let mut read = READ.with(|r| r.borrow_mut().take()).unwrap_or_default();
    let mut mask_skips = SKIPPED.with(|r| r.borrow_mut().take()).unwrap_or_default();
    if let Some(values) = values {
        let (masks, skipped) = crate::crs_masks::masks(values, aspect);
        if !masks.is_empty() {
            put(&mut out, "masks", Value::Array(masks));
        }
        if values.keys().any(|k| crate::crs_masks::CONTAINERS.contains(&k.as_str())) {
            read.extend(crate::crs_masks::CONTAINERS.iter().map(|c| c.to_string()));
            mask_skips.extend(skipped.into_iter().map(|k| format!("Mask: {k}")));
        }
        let (spots, skipped) = crate::crs_masks::spots(values, aspect);
        if !spots.is_empty() {
            put(&mut out, "spots", Value::Array(spots));
        }
        if values.keys().any(|k| crate::crs_masks::SPOT_CONTAINERS.contains(&k.as_str())) {
            read.extend(crate::crs_masks::SPOT_CONTAINERS.iter().map(|c| c.to_string()));
            mask_skips.extend(skipped.into_iter().map(|k| format!("Spot: {k}")));
        }
    }
    // fields that only switch a panel on/off or name things: not adjustments by themselves; and
    // Point Color slots that are all empty (-1)
    let value_is = |k: &str, f: &dyn Fn(&[String]) -> bool| props.get(&format!("crs:{k}")).is_some_and(|v| f(v));
    let empty_points = |v: &[String]| v.iter().all(|s| s.split(',').all(|n| n.trim().parse::<f64>().is_ok_and(|x| x == -1.0) || n.trim().is_empty()));
    let quiet = |k: &str| {
        k.starts_with("Enable")
            || k.starts_with("ToneCurveName")
            || k == "AutoTone"
            || k == "AutoGrayscaleMix"
            || (k == "PointColors" && value_is(k, &empty_points))
    };
    let mut unmapped: Vec<String> = props
        .keys()
        .filter(|k| k.starts_with("crs:"))
        .map(|k| k.split('/').next().unwrap_or(k))
        .filter(|k| !NON_ADJUSTMENT.contains(k) && !read.contains(*k))
        .map(|k| k.trim_start_matches("crs:").to_string())
        .filter(|k| !quiet(k))
        .collect();
    unmapped.dedup();
    unmapped.extend(mask_skips);
    (out, unmapped)
}

/// The selected camera profile name from an XMP packet. The name is metadata only: it does not
/// identify or carry the profile's rendering data.
pub fn camera_profile_name(props: &Props) -> Option<&str> {
    first(props, "crs:CameraProfile")
}

/// Whether an XMP packet contains a saved Lightroom Upright matrix. Lightroom's matrix uses a
/// coordinate convention that LightCraft does not currently import.
pub fn has_saved_upright_transform(props: &Props) -> bool {
    props.keys().any(|key| {
        key.strip_prefix("crs:").is_some_and(|name| {
            name.starts_with("UprightTransform_") && props.get(key).is_some_and(|values| values.iter().any(|v| !v.trim().is_empty()))
        })
    })
}

/// Read an XMP preset (`crs:` fields + `crs:Name` / `crs:Group`) into one of our presets.
/// Returns `None` when the packet has no adjustments we understand.
pub fn preset_from_xmp(xmp: &str, fallback_name: &str) -> Option<Preset> {
    let d = lightcraft_meta::parse_xmp(xmp).ok()?;
    let props = &d.properties;
    let settings = to_partial(props, Target::Any);
    if settings.as_object().is_none_or(Map::is_empty) {
        return None;
    }
    let name = first(props, "crs:Name").unwrap_or(fallback_name).to_string();
    let group = first(props, "crs:Group").unwrap_or("Imported Presets").to_string();
    let uuid = first(props, "crs:UUID").map(|u| u.to_ascii_lowercase());
    let id = format!("user.xmp.{}", uuid.unwrap_or_else(|| crate::presets::slug(&format!("{group}-{name}"))));
    Some(Preset { id, name, group, settings, favorite: false, builtin: false })
}

#[cfg(test)]
mod tests {
    use super::*;
    use lightcraft_develop::{DevelopSettings, Upright, VignetteStyle, WbMode, apply_partial};

    /// A hand-written sidecar in attribute form (as many tools write it).
    const SIDECAR: &str = r#"<x:xmpmeta xmlns:x="adobe:ns:meta/">
 <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
  <rdf:Description rdf:about="" xmlns:crs="http://ns.adobe.com/camera-raw-settings/1.0/"
    crs:Version="99.0" crs:ProcessVersion="11.0" crs:WhiteBalance="Custom" crs:Temperature="5150" crs:Tint="+12"
    crs:Exposure2012="+0.65" crs:Contrast2012="-14" crs:Highlights2012="-58" crs:Shadows2012="+41"
    crs:Whites2012="+9" crs:Blacks2012="-17" crs:Texture="+6" crs:Clarity2012="+11" crs:Dehaze="+4"
    crs:Vibrance="+19" crs:Saturation="-3" crs:HueAdjustmentOrange="-7" crs:SaturationAdjustmentBlue="-22"
    crs:LuminanceAdjustmentAqua="+13" crs:ParametricShadows="+5" crs:ParametricHighlights="-8"
    crs:ParametricMidtoneSplit="55" crs:CurveRefineSaturation="40" crs:SplitToningShadowHue="210" crs:SplitToningShadowSaturation="14"
    crs:SplitToningHighlightHue="40" crs:SplitToningHighlightSaturation="9" crs:SplitToningBalance="+20"
    crs:ColorGradeMidtoneHue="120" crs:ColorGradeMidtoneSat="6" crs:ColorGradeBlending="70"
    crs:Sharpness="55" crs:SharpenRadius="+1.2" crs:SharpenDetail="30" crs:SharpenEdgeMasking="12"
    crs:LuminanceSmoothing="18" crs:ColorNoiseReduction="25" crs:PostCropVignetteAmount="-21"
    crs:PostCropVignetteStyle="2" crs:GrainAmount="15" crs:GrainSize="30" crs:GrainFrequency="60"
    crs:PerspectiveUpright="2" crs:PerspectiveVertical="-10" crs:AutoLateralCA="1" crs:ConvertToGrayscale="False"
    crs:ShadowTint="-7" crs:RedHue="+12" crs:RedSaturation="+20" crs:GreenHue="-5" crs:GreenSaturation="+3"
    crs:BlueHue="-15" crs:BlueSaturation="+25"
    crs:HasCrop="True" crs:CropTop="0.1" crs:CropLeft="0.05" crs:CropBottom="0.9" crs:CropRight="0.8" crs:CropAngle="1.5">
   <crs:ToneCurvePV2012>
    <rdf:Seq><rdf:li>0, 0</rdf:li><rdf:li>64, 52</rdf:li><rdf:li>192, 205</rdf:li><rdf:li>255, 255</rdf:li></rdf:Seq>
   </crs:ToneCurvePV2012>
   <crs:ToneCurvePV2012Red>
    <rdf:Seq><rdf:li>0, 0</rdf:li><rdf:li>255, 255</rdf:li></rdf:Seq>
   </crs:ToneCurvePV2012Red>
  </rdf:Description>
 </rdf:RDF>
</x:xmpmeta>"#;

    fn props(x: &str) -> Props {
        lightcraft_meta::parse_xmp(x).unwrap().properties
    }

    #[test]
    fn maps_common_fields() {
        let p = props(SIDECAR);
        assert!(has_adjustments(&p));
        let partial = to_partial(&p, Target::RawAbsolute);
        let s = apply_partial(&DevelopSettings::for_raw(5000.0, 0.0), &partial, 1.0);
        assert_eq!(s.wb.mode, WbMode::Custom);
        assert_eq!((s.wb.temp, s.wb.tint), (5150.0, 12.0));
        assert_eq!(s.light.exposure, 0.65);
        assert_eq!((s.light.contrast, s.light.highlights, s.light.shadows, s.light.whites, s.light.blacks), (-14.0, -58.0, 41.0, 9.0, -17.0));
        assert_eq!((s.effects.texture, s.effects.clarity, s.effects.dehaze), (6.0, 11.0, 4.0));
        assert_eq!((s.color.vibrance, s.color.saturation), (19.0, -3.0));
        assert_eq!(s.mixer.orange.hue, -7.0);
        assert_eq!(s.mixer.blue.sat, -22.0);
        assert_eq!(s.mixer.aqua.lum, 13.0);
        assert_eq!((s.curve.shadows, s.curve.highlights, s.curve.split_mid), (5.0, -8.0, 55.0));
        assert_eq!(s.curve.master.len(), 4);
        assert_eq!(s.curve.refine_saturation, 40.0);
        assert!((s.curve.master[1].x - 64.0 / 255.0).abs() < 1e-9 && (s.curve.master[1].y - 52.0 / 255.0).abs() < 1e-9);
        assert!(s.curve.red.is_empty(), "identity channel curve maps to no curve");
        assert_eq!((s.grading.shadows.hue, s.grading.shadows.sat), (210.0, 14.0));
        assert_eq!((s.grading.highlights.hue, s.grading.highlights.sat), (40.0, 9.0));
        assert_eq!((s.grading.midtones.hue, s.grading.midtones.sat), (120.0, 6.0));
        assert_eq!((s.grading.balance, s.grading.blending), (20.0, 70.0));
        assert_eq!((s.detail.sharpen_amount, s.detail.sharpen_radius, s.detail.sharpen_detail, s.detail.sharpen_masking), (55.0, 1.2, 30.0, 12.0));
        assert_eq!((s.detail.nr_luminance, s.detail.nr_color), (18.0, 25.0));
        assert_eq!(s.vignette.amount, -21.0);
        assert_eq!(s.vignette.style, VignetteStyle::ColorPriority);
        assert_eq!((s.grain.amount, s.grain.size, s.grain.roughness), (15.0, 30.0, 60.0));
        assert_eq!(s.geometry.upright, Upright::Level);
        assert_eq!(s.geometry.vertical, -10.0);
        assert!(s.optics.remove_ca);
        assert_eq!(s.treatment, lightcraft_develop::Treatment::Color);
        let cal = s.calibration;
        assert_eq!(
            (cal.shadows_tint, cal.red_hue, cal.red_sat, cal.green_hue, cal.green_sat, cal.blue_hue, cal.blue_sat),
            (-7.0, 12.0, 20.0, -5.0, 3.0, -15.0, 25.0)
        );
        let c = s.crop.geometry;
        assert_eq!((c.rect.x0, c.rect.y0, c.rect.x1, c.rect.y1, c.angle), (0.05, 0.1, 0.8, 0.9, 1.5));
    }

    /// A sidecar curve with a `NaN` or `inf` point (Rust's `parse` reads both) is not a curve:
    /// it is left out, rather than stored with a point the curve editor can't place.
    #[test]
    fn curves_with_non_finite_points_are_left_out() {
        for bad in ["NaN, 0", "64, inf", "-inf, 3"] {
            let x = SIDECAR.replace("<rdf:li>64, 52</rdf:li>", &format!("<rdf:li>{bad}</rdf:li>"));
            let partial = to_partial(&props(&x), Target::RawAbsolute);
            let s = apply_partial(&DevelopSettings::for_raw(5000.0, 0.0), &partial, 1.0);
            assert!(s.curve.master.is_empty(), "{bad}: {:?}", s.curve.master);
            assert!(s.curve.master.iter().all(|p| p.x.is_finite() && p.y.is_finite()));
        }
    }

    #[test]
    fn only_present_fields_are_in_the_partial() {
        let x = r#"<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"><rdf:Description
            xmlns:c="http://ns.adobe.com/camera-raw-settings/1.0/" c:Vibrance="+30" c:GrainAmount="10"/></rdf:RDF>"#;
        let partial = to_partial(&props(x), Target::Any);
        assert_eq!(partial, json!({"color": {"vibrance": 30.0}, "grain": {"amount": 10.0}}));
    }

    #[test]
    fn hdr_edit_mode_turns_hdr_editing_on_or_off() {
        let x = |v: &str| {
            format!(
                r#"<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"><rdf:Description
                xmlns:crs="http://ns.adobe.com/camera-raw-settings/1.0/" crs:HDREditMode="{v}" crs:Exposure2012="+1.5"/></rdf:RDF>"#
            )
        };
        let on = apply_partial(&DevelopSettings::default(), &to_partial(&props(&x("1")), Target::RawAbsolute), 1.0);
        assert!(on.hdr.enabled);
        assert_eq!(on.light.exposure, 1.5);
        assert_eq!(on.hdr.max_ev, lightcraft_develop::Hdr::DEFAULT_MAX_EV, "the rest of the HDR settings keep their defaults");
        let true_form = apply_partial(&DevelopSettings::default(), &to_partial(&props(&x("True")), Target::RawAbsolute), 1.0);
        assert!(true_form.hdr.enabled);
        let mut hdr = DevelopSettings::default();
        hdr.hdr.enabled = true;
        assert!(!apply_partial(&hdr, &to_partial(&props(&x("0")), Target::RawAbsolute), 1.0).hdr.enabled, "0 turns it off");
        // without the field nothing about HDR changes
        let plain = r#"<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"><rdf:Description
            xmlns:crs="http://ns.adobe.com/camera-raw-settings/1.0/" crs:Exposure2012="+1.5"/></rdf:RDF>"#;
        assert!(to_partial(&props(plain), Target::RawAbsolute).get("hdr").is_none());
    }

    #[test]
    fn element_form_bw_and_incremental_wb() {
        let x = r#"<x:xmpmeta xmlns:x="adobe:ns:meta/"><rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
          <rdf:Description rdf:about="" xmlns:crs="http://ns.adobe.com/camera-raw-settings/1.0/">
            <crs:ConvertToGrayscale>True</crs:ConvertToGrayscale>
            <crs:GrayMixerBlue>-35</crs:GrayMixerBlue>
            <crs:IncrementalTemperature>25</crs:IncrementalTemperature>
            <crs:IncrementalTint>-6</crs:IncrementalTint>
            <crs:Temperature>4800</crs:Temperature>
          </rdf:Description></rdf:RDF></x:xmpmeta>"#;
        let p = props(x);
        let rendered = apply_partial(&DevelopSettings::default(), &to_partial(&p, Target::Rendered), 1.0);
        assert_eq!(rendered.treatment, lightcraft_develop::Treatment::Bw);
        assert_eq!(rendered.bw_mix.blue, -35.0);
        assert!((rendered.wb.temp - rel_to_kelvin(25.0)).abs() < 1e-6 && rendered.wb.temp > 6500.0);
        assert_eq!(rendered.wb.tint, -6.0);
        let raw = apply_partial(&DevelopSettings::default(), &to_partial(&p, Target::RawAbsolute), 1.0);
        assert_eq!(raw.wb.temp, 4800.0);
    }

    #[test]
    fn named_wb_and_already_applied() {
        let x = r#"<rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:crs="http://ns.adobe.com/camera-raw-settings/1.0/"
             crs:WhiteBalance="Daylight" crs:Temperature="5500" crs:Tint="10" crs:AlreadyApplied="True"/>"#;
        let p = props(x);
        assert_eq!(to_partial(&p, Target::RawAbsolute), json!({"wb": {"mode": "daylight"}}));
        assert!(!has_adjustments(&p));
        let bookkeeping = r#"<rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
             xmlns:crs="http://ns.adobe.com/camera-raw-settings/1.0/" crs:Version="1" crs:HasSettings="True"/>"#;
        assert!(!has_adjustments(&props(bookkeeping)));
    }

    #[test]
    fn custom_kelvin_on_relative_wb_raws_shifts_from_the_as_shot_white() {
        // Issue #510: a Sony ARW edited in Lightroom to Custom 3578 K / −5 next to an as-shot white
        // of 3650 K / −2 (written for this test from the numbers in the issue).
        let x = r#"<rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:crs="http://ns.adobe.com/camera-raw-settings/1.0/"
             crs:WhiteBalance="Custom" crs:Temperature="3578" crs:Tint="-5" crs:AsShotTemperature="3650" crs:AsShotTint="-2"/>"#;
        let p = props(x);
        let rel = to_partial(&p, Target::RawRelative);
        // 3650 → 3578 K is +5.5 mired: the same shift from 6500 K lands near 6275 K on our scale
        let t = rel["wb"]["temp"].as_f64().unwrap();
        assert!((t - 6275.0).abs() < 5.0, "{t}");
        assert_eq!(rel["wb"]["tint"], -3.0);
        assert_eq!(rel["wb"]["mode"], "custom");
        // a rendered file without `Incremental*` fields shifts the same way; a raw with a measured
        // illuminant (and a preset) keeps the Kelvin value
        assert_eq!(to_partial(&p, Target::Rendered)["wb"]["temp"], rel["wb"]["temp"]);
        assert_eq!(to_partial(&p, Target::RawAbsolute)["wb"]["temp"], 3578.0);
        assert_eq!(to_partial(&p, Target::Any)["wb"]["temp"], 3578.0);
        // Kelvin read as Kelvin says so, so it stays Kelvin on a raw with that scale; a shift does not
        assert_eq!(to_partial(&p, Target::RawAbsolute)["wb"]["scale"], "kelvin");
        assert_eq!(to_partial(&p, Target::Any)["wb"]["scale"], "kelvin");
        assert!(rel["wb"].get("scale").is_none() && to_partial(&p, Target::Rendered)["wb"].get("scale").is_none());
        // the as-shot fields are a reference, not an adjustment: nothing to report
        assert!(to_partial_report(&p, None, Target::RawRelative, 1.5).1.is_empty());
        // no tint next to the as-shot tint: the custom tint is taken as the shift itself
        let no_tint = props(&x.replace(r#" crs:AsShotTint="-2""#, ""));
        assert_eq!(to_partial(&no_tint, Target::RawRelative)["wb"]["tint"], -5.0);
    }

    #[test]
    fn custom_kelvin_without_an_as_shot_reference_stays_as_shot_and_is_reported() {
        // The same edit from a Lightroom catalog, which keeps no as-shot white for Custom photos:
        // 3578 K read on the relative scale would be a large blue shift (issue #510)
        let x = r#"<rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:crs="http://ns.adobe.com/camera-raw-settings/1.0/"
             crs:WhiteBalance="Custom" crs:Temperature="3578" crs:Tint="-5" crs:Exposure2012="+0.3"/>"#;
        let p = props(x);
        let (partial, unmapped) = to_partial_report(&p, None, Target::RawRelative, 1.5);
        assert_eq!(partial["wb"], json!({"mode": "asShot"}));
        assert_eq!(partial["light"]["exposure"], 0.3);
        assert_eq!(unmapped.len(), 1, "{unmapped:?}");
        assert!(unmapped[0].starts_with("Temperature, Tint"), "{unmapped:?}");
        // a raw with a measured illuminant and a rendered file read it as before, and report nothing
        assert_eq!(to_partial(&p, Target::RawAbsolute)["wb"]["temp"], 3578.0);
        assert_eq!(to_partial(&p, Target::Rendered)["wb"]["temp"], 3578.0);
        assert!(to_partial_report(&p, None, Target::RawAbsolute, 1.5).1.is_empty());
        // an unusable reference (zero) counts as none
        let zero = props(&x.replace(r#" crs:Tint="-5""#, r#" crs:Tint="-5" crs:AsShotTemperature="0""#));
        assert_eq!(to_partial(&zero, Target::RawRelative)["wb"], json!({"mode": "asShot"}));
    }

    #[test]
    fn target_follows_the_file() {
        use lightcraft_catalog::MediaKind;
        assert_eq!(Target::for_file(MediaKind::Raw, "ARW", false, ""), Target::RawRelative);
        assert_eq!(Target::for_file(MediaKind::Raw, "nef", false, "NIKON CORPORATION NIKON D7500"), Target::RawRelative);
        // Lightroom's `fileFormat` name for proprietary raws
        assert_eq!(Target::for_file(MediaKind::Raw, "RAW", false, "SONY ILCE-7M2"), Target::RawRelative);
        assert_eq!(Target::for_file(MediaKind::Raw, "DNG", false, ""), Target::RawAbsolute);
        // a raw shown from its embedded preview develops like a rendered file
        assert_eq!(Target::for_file(MediaKind::Raw, "ARW", true, "SONY ILCE-7M3"), Target::Rendered);
        assert_eq!(Target::for_file(MediaKind::Image, "JPG", false, "SONY ILCE-7M3"), Target::Rendered);
        // a camera with measured matrices edits in Kelvin (issue #730), under any of its names
        assert_eq!(Target::for_file(MediaKind::Raw, "ARW", false, "SONY ILCE-7M3"), Target::RawAbsolute);
        assert_eq!(Target::for_file(MediaKind::Raw, "RAW", false, "ILCE-7M3"), Target::RawAbsolute);
        assert_eq!(Target::for_file(MediaKind::Raw, "NEF", false, "NIKON CORPORATION NIKON D850"), Target::RawAbsolute);
        assert_eq!(Target::for_file(MediaKind::Raw, "CR2", false, "Canon Canon EOS 5D Mark III"), Target::RawAbsolute);
        let mut p =
            lightcraft_catalog::Photo::new(lightcraft_catalog::PhotoId(1), lightcraft_catalog::Source::Demo { scene: 0 }, "a.arw", "ARW", 1, 1, "");
        p.kind = MediaKind::Raw;
        assert_eq!(Target::for_photo(&p), Target::RawRelative);
        p.meta.camera = "SONY ILCE-7M3".into();
        assert_eq!(Target::for_photo(&p), Target::RawAbsolute);
    }

    /// Lightroom writes `crs:Temperature` as Kelvin for a raw whose camera LightCraft has matrices for: the value
    /// is read as written, marked Kelvin, and the as-shot reference is not needed (issue #730); the same packet on
    /// a raw without matrices still takes the #510 shift.
    #[test]
    fn kelvin_is_direct_on_raws_whose_camera_has_matrices() {
        use lightcraft_catalog::MediaKind;
        let x = r#"<rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:crs="http://ns.adobe.com/camera-raw-settings/1.0/"
             crs:WhiteBalance="Custom" crs:Temperature="4650" crs:Tint="+3" crs:AsShotTemperature="5400" crs:AsShotTint="-1"/>"#;
        let p = props(x);
        let a7m3 = Target::for_file(MediaKind::Raw, "ARW", false, "SONY ILCE-7M3");
        assert_eq!(to_partial(&p, a7m3)["wb"], json!({"mode": "custom", "temp": 4650.0, "tint": 3.0, "scale": "kelvin"}));
        let a7m2 = Target::for_file(MediaKind::Raw, "ARW", false, "SONY ILCE-7M2");
        let shifted = to_partial(&p, a7m2);
        assert!(shifted["wb"]["temp"].as_f64().is_some_and(|t| t > 5000.0 && t < 6500.0), "{shifted}");
        assert_eq!(shifted["wb"]["tint"], 4.0);
        assert!(shifted["wb"].get("scale").is_none());
        // without the reference the Kelvin camera still reads it, the other stays As Shot
        let bare = props(&x.replace(r#" crs:AsShotTemperature="5400" crs:AsShotTint="-1""#, ""));
        assert_eq!(to_partial(&bare, a7m3)["wb"]["temp"], 4650.0);
        assert_eq!(to_partial(&bare, a7m2)["wb"], json!({"mode": "asShot"}));
        // a named preset carries no numbers either way
        let daylight = props(&x.replace(r#"crs:WhiteBalance="Custom""#, r#"crs:WhiteBalance="Daylight""#));
        assert_eq!(to_partial(&daylight, a7m3)["wb"], json!({"mode": "daylight"}));
    }

    #[test]
    fn xmp_preset_with_name_and_group() {
        // Written for this test: a minimal preset-shaped packet with localized name/group.
        let x = r#"<x:xmpmeta xmlns:x="adobe:ns:meta/"><rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
          <rdf:Description rdf:about="" xmlns:crs="http://ns.adobe.com/camera-raw-settings/1.0/"
             crs:PresetType="Normal" crs:UUID="0123ABCD" crs:Contrast2012="+25" crs:SupportsAmount="True">
            <crs:Name><rdf:Alt><rdf:li xml:lang="x-default">Punchy Test</rdf:li></rdf:Alt></crs:Name>
            <crs:Group><rdf:Alt><rdf:li xml:lang="x-default">My Looks</rdf:li></rdf:Alt></crs:Group>
          </rdf:Description></rdf:RDF></x:xmpmeta>"#;
        let p = preset_from_xmp(x, "file").unwrap();
        assert_eq!((p.name.as_str(), p.group.as_str(), p.id.as_str()), ("Punchy Test", "My Looks", "user.xmp.0123abcd"));
        assert_eq!(p.settings, json!({"light": {"contrast": 25.0}}));
        assert!(!p.builtin);
        assert!(preset_from_xmp("<x/>", "f").is_none());
    }

    /// A preset packet (written for this test) with the bookkeeping fields Lightroom presets carry.
    fn preset_packet(extra_attrs: &str, extra_elems: &str) -> String {
        format!(
            r#"<x:xmpmeta xmlns:x="adobe:ns:meta/"><rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
          <rdf:Description rdf:about="" xmlns:crs="http://ns.adobe.com/camera-raw-settings/1.0/"
             crs:PresetType="Normal" crs:Cluster="" crs:UUID="0123ABCD" crs:SupportsAmount2="True" crs:SupportsAmount="True"
             crs:RequiresRGBTables="False" crs:Contrast2012="+25" crs:LensProfileEnable="0" crs:OverrideLookVignette="False"
             crs:CropConstrainToWarp="0" crs:AsShotTemperature="5500" crs:AsShotTint="10" {extra_attrs}>
            <crs:SortName><rdf:Alt><rdf:li xml:lang="x-default"/></rdf:Alt></crs:SortName>
            <crs:Description><rdf:Alt><rdf:li xml:lang="x-default"/></rdf:Alt></crs:Description>
            {extra_elems}
          </rdf:Description></rdf:RDF></x:xmpmeta>"#
        )
    }

    #[test]
    fn channel_curves_need_the_master_and_all_channel_curves() {
        // Lightroom applies red / green / blue curves only when the master and all three are present
        let seq = |name: &str, pts: &str| format!("<crs:{name}><rdf:Seq>{pts}</rdf:Seq></crs:{name}>");
        let identity = "<rdf:li>0, 0</rdf:li><rdf:li>255, 255</rdf:li>";
        let bent = "<rdf:li>0, 0</rdf:li><rdf:li>64, 40</rdf:li><rdf:li>255, 255</rdf:li>";
        let packet = |curves: &[String]| {
            format!(
                r#"<x:xmpmeta xmlns:x="adobe:ns:meta/"><rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
          <rdf:Description rdf:about="" xmlns:crs="http://ns.adobe.com/camera-raw-settings/1.0/" crs:ToneCurveName2012="Custom">{}
          </rdf:Description></rdf:RDF></x:xmpmeta>"#,
                curves.concat()
            )
        };
        let partial = |curves: &[String]| to_partial(&props(&packet(curves)), Target::RawAbsolute);
        let (master, red, green, blue) = (
            seq("ToneCurvePV2012", identity),
            seq("ToneCurvePV2012Red", identity),
            seq("ToneCurvePV2012Green", bent),
            seq("ToneCurvePV2012Blue", identity),
        );
        // a channel curve alone, or with the master but without its two siblings: ignored
        let alone = partial(std::slice::from_ref(&green));
        assert!(alone.pointer("/curve/green").is_none(), "{alone}");
        let master_and_green = partial(&[master.clone(), green.clone()]);
        assert!(master_and_green.pointer("/curve/green").is_none() && master_and_green.pointer("/curve/master").is_some(), "{master_and_green}");
        // all four: read
        let all = partial(&[master, red, green, blue]);
        assert!(["/curve/master", "/curve/red", "/curve/green", "/curve/blue"].iter().all(|p| all.pointer(p).is_some()), "{all}");
    }

    fn unmapped(x: &str) -> Vec<String> {
        to_partial_report(&props(x), None, Target::Any, 1.5).1
    }

    #[test]
    fn preset_bookkeeping_is_not_reported_but_real_gaps_are() {
        let empty_points = "<crs:PointColors><rdf:Seq><rdf:li>-1.000000, -1.000000, -1.000000, -1.000000</rdf:li></rdf:Seq></crs:PointColors>";
        assert_eq!(unmapped(&preset_packet(r#"crs:HDREditMode="0""#, empty_points)), Vec::<String>::new());
        // a used Point Color slot and an unknown adjustment still are (an HDR edit is carried over)
        let used_points = "<crs:PointColors><rdf:Seq><rdf:li>0.5, 0.2, 0.1, 10, 0, 0, 0, 0</rdf:li></rdf:Seq></crs:PointColors>";
        let got = unmapped(&preset_packet(r#"crs:HDREditMode="1" crs:FutureSlider="12""#, used_points));
        assert_eq!(got, ["FutureSlider", "PointColors"]);
    }

    #[test]
    fn disabled_lens_profile_switch_keeps_embedded_corrections() {
        // Lightroom applies a file's built-in lens corrections regardless of its profile switch,
        // and ours are only those: a preset's `LensProfileEnable=0` must not turn them off
        let p = props(&preset_packet("", ""));
        let mut d = DevelopSettings::default();
        d.optics.lens_profile = true;
        assert!(apply_partial(&d, &to_partial(&p, Target::Any), 1.0).optics.lens_profile);
        let on = props(&preset_packet("", "").replace(r#"crs:LensProfileEnable="0""#, r#"crs:LensProfileEnable="1""#));
        assert!(apply_partial(&DevelopSettings::default(), &to_partial(&on, Target::Any), 1.0).optics.lens_profile);
    }
}