//! File menu.

use effectcraft_color::Label;
use effectcraft_project::{FootageKind, ItemId, ItemKind, LayerSource, Project};
use serde_json::{Value, json};

use super::{CommandSpec, always, b_p, bad, str_p};
use crate::{EngineError, Result, Session, cmd};

fn has_path(s: &Session) -> std::result::Result<(), String> {
    if s.path.is_some() { Ok(()) } else { Err("the project has not been saved yet".into()) }
}

fn new_project(s: &mut Session, _: &Value) -> Result<Value> {
    // Settings ▸ Project ▸ New Project Loads Template: open the template as an untitled project.
    let tpl = s.prefs.project.template_path.trim().to_string();
    if s.prefs.project.use_template && !tpl.is_empty() {
        let bytes = s.services.read_file(&tpl).map_err(|e| EngineError::Other(format!("cannot read the new project template {tpl}: {e}")))?;
        let text = String::from_utf8(bytes).map_err(|_| EngineError::Other("the new project template is not a project file".into()))?;
        s.replace_project(Project::from_json(&text)?, None);
        s.update_sentinel();
        return Ok(json!({"template": tpl}));
    }
    s.replace_project(Project::default(), None);
    s.update_sentinel();
    Ok(Value::Null)
}

fn demo(s: &mut Session, _: &Value) -> Result<Value> {
    let p = crate::demo::demo_project();
    s.replace_project(p, None);
    if let Some(id) = s.project.items.values().find(|i| i.name == crate::demo::MAIN_COMP).map(|i| i.id) {
        s.open_comp(id);
        s.set_time(effectcraft_time::Tick::from_seconds_f64(2.5));
    }
    Ok(json!({"comp": s.state.active_comp.map(|c| c.0)}))
}

pub(crate) fn open(s: &mut Session, p: &Value) -> Result<Value> {
    let path = str_p(p, "path").ok_or_else(|| bad("file.open", "missing `path`"))?;
    let bytes = s.services.read_file(path).map_err(|e| EngineError::Other(format!("cannot read {path}: {e}")))?;
    let text = String::from_utf8(bytes).map_err(|_| EngineError::Other("not a text project file".into()))?;
    // XML copies (File ▸ Save a Copy As XML…) open like the JSON project.
    let text = if crate::xml_project::is_xml(&text) { crate::xml_project::from_xml(&text).map_err(EngineError::Other)? } else { text };
    let proj = Project::from_json(&text).map_err(|e| EngineError::Other(format!("{path} is not a project EffectCraft can open: {e}")))?;
    s.replace_project(proj, Some(path.to_string()));
    s.note_project_path(path);
    // Written by a newer EffectCraft: what this version doesn't know would be lost on saving.
    let saved_by = effectcraft_project::saved_by(&text);
    if let Some(v) = saved_by.as_deref().filter(|v| effectcraft_project::is_newer_version(v, effectcraft_project::APP_VERSION)) {
        s.toast(format!(
            "This project was saved by EffectCraft {v}, newer than this version ({}). Settings this version doesn't know are lost if you save it.",
            effectcraft_project::APP_VERSION
        ));
    }
    // Lazy open: footage is checked in the background (Progress panel), not before the
    // project shows.
    if s.check_footage_on_open {
        crate::footage_check::start(s, None, false)?;
    }
    Ok(json!({"path": path, "savedBy": saved_by}))
}

/// The project file's text for `path`: `.ecproj` JSON, or XML for `.ecprojx` / `.xml` (a
/// project opened from an XML copy saves as XML again). Fails, writing nothing, when the project
/// wouldn't read back.
pub(crate) fn file_text(s: &Session, path: &str) -> Result<String> {
    let json = s.project.to_file_json()?;
    if crate::xml_project::is_xml_path(path) { crate::xml_project::to_xml(&json).map_err(EngineError::Other) } else { Ok(json) }
}

fn save_to(s: &mut Session, path: &str) -> Result<Value> {
    let json = file_text(s, path)?;
    s.services.write_file(path, json.as_bytes()).map_err(|e| EngineError::Other(format!("cannot write {path}: {e}")))?;
    s.path = Some(path.to_string());
    s.mark_saved();
    s.note_project_path(path);
    s.toast(format!("Saved {path}"));
    Ok(json!({"path": path, "bytes": json.len()}))
}

fn save(s: &mut Session, p: &Value) -> Result<Value> {
    let path = str_p(p, "path").map(str::to_string).or_else(|| s.path.clone()).ok_or_else(|| bad("file.save", "no path: use file.saveAs {path}"))?;
    save_to(s, &path)
}

fn save_as(s: &mut Session, p: &Value) -> Result<Value> {
    let path = str_p(p, "path").ok_or_else(|| bad("file.saveAs", "missing `path`"))?;
    save_to(s, path)
}

fn increment_save(s: &mut Session, _: &Value) -> Result<Value> {
    let cur = s.path.clone().ok_or_else(|| bad("file.incrementAndSave", "save the project first"))?;
    // After Effects: `Intro.aep` → `Intro 2.aep` → `Intro 3.aep`.
    let next = crate::autosave::increment_path(&cur, |p| s.file_ops().is_file(std::path::Path::new(p)));
    save_to(s, &next)
}

fn revert(s: &mut Session, _: &Value) -> Result<Value> {
    let path = s.path.clone().ok_or_else(|| bad("file.revert", "not saved"))?;
    open(s, &json!({"path": path}))
}

/// File ▸ Import; with `addToComp` (files dropped on the Timeline or the Composition viewer) they
/// also become layers of the active comp ([`add_to_comp`]).
///
/// With `background` (files dropped on the window or picked in the Import dialog) the files are
/// probed on a background thread, so decoding a slow video doesn't freeze the app: the job shows
/// the file being read and how many are left (Window ▸ Progress, `jobs.list`), then adds them in
/// one undo step, selects them and reports how many arrived ("Imported 3 items").
fn import_cmd(s: &mut Session, p: &Value) -> Result<Value> {
    let target = s.active_comp_id();
    let mut pending = prepare_import(s, p)?;
    if b_p(p, "background").unwrap_or(false) && !pending.paths.is_empty() {
        let paths = std::mem::take(&mut pending.paths);
        let total = paths.len();
        let label = match paths.first() {
            Some(one) if total == 1 => format!("Importing {}", file_name(one)),
            _ => format!("Importing {total} files"),
        };
        let p = p.clone();
        return s.spawn_task("import", label, false, move |ctl| {
            let mut probed = Vec::with_capacity(total);
            for (k, path) in paths.into_iter().enumerate() {
                ctl.message(format!("{} ({} of {total})", file_name(&path), k + 1));
                if !ctl.progress(k as u64, total as u64) {
                    return Err(crate::render_queue::CANCELLED.into());
                }
                let r = pending.prober.probe(&path);
                probed.push(r);
            }
            ctl.progress(total as u64, total as u64);
            let apply: crate::jobs::Apply = Box::new(move |s: &mut Session| {
                let made = pending.comps.len() + probed.iter().filter(|r| r.is_ok()).count();
                let mut r = add_footage(s, pending, probed)?;
                finish_import(s, &mut r, target, &p);
                let mut toast = format!("Imported {made} item{}", if made == 1 { "" } else { "s" });
                let errors: Vec<&str> = r["errors"].as_array().into_iter().flatten().filter_map(Value::as_str).collect();
                match errors.as_slice() {
                    [] => {}
                    [one] => toast = format!("{toast}. {one}"),
                    [first, rest @ ..] => toast = format!("{toast}. {first} (and {} more)", rest.len()),
                }
                r["toast"] = json!(toast);
                Ok(r)
            });
            Ok(apply)
        });
    }
    let probed = pending.paths.iter().map(|path| pending.prober.probe(path)).collect();
    let mut r = add_footage(s, pending, probed)?;
    finish_import(s, &mut r, target, p);
    Ok(r)
}

/// The file name of a path, for labels.
fn file_name(path: &str) -> String {
    std::path::Path::new(path).file_name().map(|n| n.to_string_lossy().to_string()).unwrap_or_else(|| path.to_string())
}

/// After an import (its result `r`): with `addToComp`, the new items become layers of `target`;
/// what couldn't be added joins the result's errors.
fn finish_import(s: &mut Session, r: &mut Value, target: Option<ItemId>, p: &Value) {
    let errors = add_to_comp(s, r, target, p);
    if !errors.is_empty()
        && let Some(e) = r.get_mut("errors").and_then(Value::as_array_mut)
    {
        e.extend(errors.into_iter().map(Value::from));
    }
}

/// With `addToComp`, put what an import (its result `r`) made into `target`, the comp that was
/// active before it, one layer under the other, at the drop's `time`, `index` and `position`
/// (as in `layer.addItem`): the comps of layered files (their layers' footage stays in the
/// Project panel) and the other footage. `target` stays open. Returns what couldn't be added.
pub(crate) fn add_to_comp(s: &mut Session, r: &Value, target: Option<ItemId>, p: &Value) -> Vec<String> {
    let Some(cid) = target.filter(|_| p.get("addToComp").and_then(Value::as_bool).unwrap_or(false)) else { return vec![] };
    let ids = |k: &str| r.get(k).and_then(Value::as_array).into_iter().flatten().filter_map(Value::as_u64).collect::<Vec<u64>>();
    let comps = ids("comps");
    let in_comps: std::collections::HashSet<u64> = comps
        .iter()
        .filter_map(|c| s.project.comp(ItemId(*c)))
        .flat_map(|c| c.layers.iter())
        .filter_map(|l| match l.source {
            LayerSource::Footage { item } | LayerSource::Comp { item } | LayerSource::Solid { item } => Some(item.0),
            _ => None,
        })
        .collect();
    let add: Vec<u64> = comps.iter().copied().chain(ids("items").into_iter().filter(|i| !in_comps.contains(i))).collect();
    let mut errors = vec![];
    for (k, item) in add.into_iter().enumerate() {
        let mut params = json!({"comp": cid.0, "item": item, "time": p.get("time"), "position": p.get("position")});
        if let Some(i) = p.get("index").and_then(Value::as_u64) {
            params["index"] = json!(i.saturating_add(k as u64));
        }
        if let Err(e) = s.execute("layer.addItem", params) {
            errors.push(e.to_string());
        }
    }
    if s.active_comp_id() != Some(cid) {
        s.open_comp(cid);
    }
    errors
}

/// File ▸ Import, all in one go (scripts and commands built on it); see [`import_cmd`].
pub(crate) fn import(s: &mut Session, p: &Value) -> Result<Value> {
    let pending = prepare_import(s, p)?;
    let probed = pending.paths.iter().map(|path| pending.prober.probe(path)).collect();
    add_footage(s, pending, probed)
}

/// An import whose layered files are already compositions: the files left to probe as footage,
/// how, and what the import made so far.
struct PendingImport {
    paths: Vec<String>,
    prober: Prober,
    comps: Vec<u64>,
    items: Vec<u64>,
    errors: Vec<String>,
}

/// Everything probing a file needs, apart from the session (it can run on a background thread).
struct Prober {
    importer: Option<std::sync::Arc<dyn crate::Importer>>,
    services: std::sync::Arc<dyn crate::Services>,
    /// Settings ▸ Import ▸ Report Missing Frames.
    report_missing_frames: bool,
    /// Settings ▸ Import ▸ Interpret Unlabeled Alpha As, for stills and for movies.
    still_alpha: Option<effectcraft_project::AlphaMode>,
    movie_alpha: Option<effectcraft_project::AlphaMode>,
    /// Settings ▸ Import ▸ Sequence Footage frames per second.
    sequence_rate: effectcraft_time::FrameRate,
    /// PDF / Illustrator page (0-based).
    page: u32,
    /// Choose Layer: one layer of a Photoshop document.
    psd_layer: Option<Value>,
}

/// A file probed as footage.
struct Probed {
    path: String,
    footage: effectcraft_project::Footage,
    /// Its alpha is unlabeled and Settings say Ask User: open Interpret Footage.
    ask_alpha: bool,
    warning: Option<String>,
}

impl Prober {
    /// Probe `path` as footage; the error names the file.
    fn probe(&self, path: &str) -> std::result::Result<Probed, String> {
        let fail = |e: String| format!("{path}: {e}");
        // Data files (JSON, CSV, TSV) for data-driven animation: kept as text in the project.
        if let Some(f) = data_footage(self.services.as_ref(), path) {
            return f.map(|footage| Probed { path: path.to_string(), footage, ask_alpha: false, warning: None }).map_err(fail);
        }
        let importer = self.importer.as_ref().ok_or_else(|| fail("media import is not available in this build".into()))?;
        let mut f = importer.probe(path).map_err(fail)?;
        let mut warning = None;
        // Settings ▸ Import ▸ Report Missing Frames.
        if f.kind == FootageKind::Sequence
            && self.report_missing_frames
            && let Some(gaps) = missing_frames(&f.sequence)
        {
            warning = Some(format!("{path}: {gaps}"));
        }
        // Settings ▸ Import ▸ Interpret Unlabeled Alpha As: images only (a 3D model renders its
        // own alpha, and audio and data have none).
        let mut ask_alpha = false;
        if matches!(f.kind, FootageKind::Still | FootageKind::Sequence | FootageKind::Video)
            && f.alpha != effectcraft_project::AlphaMode::Ignore
            && !alpha_is_labeled(path, &f.codec)
        {
            let setting = if f.kind == FootageKind::Video { self.movie_alpha } else { self.still_alpha };
            match setting {
                Some(a) => f.alpha = a,
                None => ask_alpha = true,
            }
        }
        // Settings ▸ Import ▸ Sequence Footage frames per second.
        if f.kind == FootageKind::Sequence {
            let r = self.sequence_rate;
            let frames = f.frame_rate.frame_at(f.duration);
            f.frame_rate = r;
            f.duration = r.tick_of(frames.max(1));
        }
        // Page: another page of a PDF / Illustrator file.
        if self.page > 0 && matches!(f.codec.as_str(), "PDF" | "AI") {
            let doc = self
                .services
                .read_file(path)
                .map_err(|e| e.to_string())
                .and_then(|b| effectcraft_pdf::parse_page(&b, self.page as usize).map_err(|e| e.to_string()))
                .map_err(fail)?;
            (f.width, f.height) = doc.pixel_size();
            f.page = self.page;
        }
        // Choose Layer: one layer of a Photoshop document (document-sized).
        if let Some(sel) = &self.psd_layer
            && f.codec == "PSD"
        {
            let (index, name) = self
                .services
                .read_file(path)
                .ok()
                .and_then(|b| effectcraft_psd::Psd::parse(b).ok())
                .and_then(|d| find_psd_layer(&d, sel))
                .ok_or_else(|| fail(format!("no layer {sel}")))?;
            f.layer = Some(effectcraft_project::SourceLayer { index: index as u32, name, layer_size: false, embedded: None, placed: false });
        }
        Ok(Probed { path: path.to_string(), footage: f, ask_alpha, warning })
    }
}

/// The first part of an import: read the parameters, note the files as recent footage, and
/// import layered files (Photoshop, PDF, Illustrator, EPS) as compositions when `importAs` (or,
/// for dropped files, Default Drag Import As) asks for that. The other files are left to probe.
fn prepare_import(s: &mut Session, p: &Value) -> Result<PendingImport> {
    let paths: Vec<String> = match p.get("paths").or(p.get("path")) {
        Some(Value::Array(a)) => a.iter().filter_map(|v| v.as_str().map(str::to_string)).collect(),
        Some(Value::String(x)) => vec![x.clone()],
        _ => return Err(bad("file.import", "missing `paths`")),
    };
    // Photoshop documents as compositions (Import As: Composition / – Retain Layer Sizes).
    // Files dragged in follow Settings ▸ Import ▸ Default Drag Import As.
    let drag = p.get("drag").and_then(Value::as_bool).unwrap_or(false);
    let import_as = str_p(p, "importAs").unwrap_or(if drag { s.prefs.drag_import_as() } else { "footage" });
    for path in &paths {
        s.prefs.push_recent_footage(path);
    }
    s.save_prefs();
    let retain = match import_as {
        "footage" => None,
        "composition" | "comp" => Some(false),
        "compositionLayerSizes" | "compositionRetainLayerSizes" | "layerSizes" => Some(true),
        other => return Err(bad("file.import", format!("importAs: footage|composition|compositionLayerSizes, not `{other}`"))),
    };
    // PDF / Illustrator: which page (1-based, as in the Import dialog).
    let page = match p.get("page") {
        None | Some(Value::Null) => 0,
        Some(v) => match v.as_u64().or_else(|| v.as_f64().filter(|x| x.fract() == 0.0 && *x >= 1.0).map(|x| x as u64)) {
            Some(n) if n >= 1 => (n - 1) as u32,
            _ => return Err(bad("file.import", "page: a page number from 1")),
        },
    };
    let mut paths = paths;
    let mut comps = vec![];
    let mut items = vec![];
    let mut errors = vec![];
    if let Some(retain) = retain {
        let mut rest = vec![];
        for path in paths {
            let bytes = match s.services.read_file(&path) {
                Ok(b) if effectcraft_psd::is_psd(&b) => b,
                Ok(b) if effectcraft_pdf::sniff(&b).is_some() && !path.to_ascii_lowercase().ends_with(".svg") => {
                    // PDF / Illustrator / EPS: one layer per file layer.
                    match import_vector_comp(s, &path, &b, page) {
                        Ok((comp, made)) => {
                            comps.push(comp);
                            items.extend(made);
                        }
                        Err(e) => errors.push(e.to_string()),
                    }
                    continue;
                }
                _ => {
                    rest.push(path);
                    continue;
                }
            };
            match import_psd_comp(s, &path, bytes, retain) {
                Ok((comp, made, warnings)) => {
                    comps.push(comp);
                    items.extend(made);
                    errors.extend(warnings);
                }
                Err(e) => errors.push(format!("{path}: {e}")),
            }
        }
        paths = rest;
    }
    let prober = Prober {
        importer: s.importer.clone(),
        services: s.services.clone(),
        report_missing_frames: s.prefs.import.report_missing_frames,
        still_alpha: s.prefs.unlabeled_alpha(false),
        movie_alpha: s.prefs.unlabeled_alpha(true),
        sequence_rate: effectcraft_time::FrameRate::from_f64(s.prefs.import.sequence_fps),
        page,
        psd_layer: p.get("layer").cloned(),
    };
    Ok(PendingImport { paths, prober, comps, items, errors })
}

/// The last part of an import: add the probed files to the project (one undo step) and select
/// everything the import made, so the Project panel shows it.
fn add_footage(s: &mut Session, pending: PendingImport, probed: Vec<std::result::Result<Probed, String>>) -> Result<Value> {
    let PendingImport { comps, mut items, mut errors, .. } = pending;
    let mut found = vec![];
    let mut warnings = vec![];
    for r in probed {
        match r {
            Ok(f) => {
                warnings.extend(f.warning.clone());
                found.push(f);
            }
            Err(e) => errors.push(e),
        }
    }
    let mut asked: Vec<u64> = vec![];
    let made: Vec<ItemId> = comps.iter().map(|c| ItemId(*c)).collect();
    if !found.is_empty() {
        s.edit("Import", None, |proj, st| {
            let mut selection = made;
            for f in found {
                let name = file_name(&f.path);
                let footage = f.footage;
                let name = match &footage.layer {
                    Some(l) => format!("{}/{name}", l.name),
                    None if footage.page > 0 => format!("{name} (Page {})", footage.page + 1),
                    None => name,
                };
                let label = match footage.kind {
                    FootageKind::Still | FootageKind::Sequence => Label::Lavender,
                    FootageKind::Audio => Label::SeaFoam,
                    FootageKind::Video | FootageKind::Model => Label::Aqua,
                    FootageKind::Data => Label::Sandstone,
                };
                let id = proj.add_item(&name, label, None, ItemKind::Footage(footage));
                items.push(id.0);
                if f.ask_alpha {
                    asked.push(id.0);
                }
                selection.push(id);
            }
            st.project_selection = selection;
            Ok(())
        })?;
    }
    if let Some(c) = comps.first() {
        s.open_comp(ItemId(*c));
    }
    for w in &warnings {
        s.events.push(crate::Event::Toast { message: w.clone(), error: true });
    }
    // Ask User: the frontend opens Interpret Footage for footage with unlabeled alpha.
    if let Some(first) = asked.first() {
        s.events.push(crate::Event::Frontend { command: "file.interpretFootage".into(), params: json!({"item": first, "reason": "unlabeledAlpha"}) });
    }
    Ok(json!({"items": items, "comps": comps, "errors": errors, "warnings": warnings, "unlabeledAlpha": asked}))
}

/// Whether a file format states how its alpha is stored (PNG, GIF, WebP and PSD are straight by
/// definition, OpenEXR premultiplied); TGA, TIFF and movies with alpha don't.
fn alpha_is_labeled(path: &str, codec: &str) -> bool {
    let ext = std::path::Path::new(path).extension().map(|e| e.to_string_lossy().to_ascii_lowercase()).unwrap_or_default();
    matches!(ext.as_str(), "png" | "gif" | "webp" | "psd" | "psb" | "exr" | "svg" | "jpg" | "jpeg" | "ai" | "pdf" | "eps") || codec.eq_ignore_ascii_case("PSD")
}

/// Gaps in an image sequence's frame numbers ("missing frames 4–6, 9"), from the digit run at the
/// end of each file name. `None` when the numbering is continuous (or there is none).
pub(crate) fn missing_frames(files: &[String]) -> Option<String> {
    let num = |f: &String| -> Option<i64> {
        let stem = std::path::Path::new(f).file_stem()?.to_string_lossy().to_string();
        let digits: String = stem.chars().rev().take_while(char::is_ascii_digit).collect::<Vec<_>>().into_iter().rev().collect();
        digits.parse().ok()
    };
    let mut ns: Vec<i64> = files.iter().filter_map(num).collect();
    ns.sort_unstable();
    ns.dedup();
    let mut gaps = vec![];
    let mut total = 0;
    for w in ns.windows(2) {
        if w[1] - w[0] > 1 {
            let (a, b) = (w[0] + 1, w[1] - 1);
            total += b - a + 1;
            gaps.push(if a == b { a.to_string() } else { format!("{a}–{b}") });
        }
    }
    (!gaps.is_empty()).then(|| format!("{total} missing frame{} ({})", if total == 1 { "" } else { "s" }, gaps.join(", ")))
}

/// A Photoshop layer by index or name (pixel layers only).
fn find_psd_layer(d: &effectcraft_psd::Psd, sel: &Value) -> Option<(usize, String)> {
    let l = match sel {
        Value::Number(n) => d.layers.get(n.as_u64()? as usize)?,
        Value::String(name) => d.layers.iter().find(|l| &l.name == name)?,
        _ => return None,
    };
    Some((l.index, l.name.clone()))
}

/// Import a Photoshop document as a composition (one undo step). Returns (comp, items, warnings).
pub(crate) fn import_psd_comp(s: &mut Session, path: &str, bytes: Vec<u8>, retain: bool) -> Result<(u64, Vec<u64>, Vec<String>)> {
    let psd = effectcraft_psd::Psd::parse(bytes).map_err(|e| EngineError::Other(e.to_string()))?;
    let name = std::path::Path::new(path).file_stem().map(|n| n.to_string_lossy().to_string()).unwrap_or_else(|| "Photoshop".into());
    let rate = effectcraft_time::FrameRate::FPS_29_97;
    let secs = if s.prefs.import.still_footage == "seconds" { s.prefs.import.still_seconds } else { 10.0 };
    let duration = rate.snap_nearest(effectcraft_time::Tick::from_seconds_f64(secs));
    let r = s.edit("Import", None, |proj, st| {
        let r = crate::psd_import::import(proj, &psd, path, &name, retain, rate, duration);
        st.project_selection = vec![r.comp];
        Ok(r)
    })?;
    let mut items = vec![r.folder.0];
    items.extend(r.items.iter().map(|i| i.0));
    Ok((r.comp.0, items, r.warnings))
}

/// Import page `page` of a PDF / Illustrator / EPS file as a composition (one undo step).
/// Returns (comp, items).
fn import_vector_comp(s: &mut Session, path: &str, bytes: &[u8], page: u32) -> Result<(u64, Vec<u64>)> {
    let mut name = std::path::Path::new(path).file_stem().map(|n| n.to_string_lossy().to_string()).unwrap_or_else(|| "Vector".into());
    if page > 0 {
        name = format!("{name} (Page {})", page + 1);
    }
    let rate = effectcraft_time::FrameRate::FPS_29_97;
    let secs = if s.prefs.import.still_footage == "seconds" { s.prefs.import.still_seconds } else { 10.0 };
    let duration = rate.snap_nearest(effectcraft_time::Tick::from_seconds_f64(secs));
    let (comp, folder, items) = s.edit("Import", None, |proj, st| {
        let r = crate::vector::import_vector_comp(proj, path, bytes, &name, page, rate, duration).map_err(EngineError::Other)?;
        st.project_selection = vec![r.0];
        Ok(r)
    })?;
    let mut out = vec![folder.0];
    out.extend(items.iter().map(|i| i.0));
    Ok((comp.0, out))
}

/// Extensions imported as data footage.
pub const DATA_EXTENSIONS: &[&str] = &["json", "csv", "tsv"];

/// A data footage item for `path` (JSON / CSV / TSV), `None` for other files.
pub(crate) fn data_footage(services: &dyn crate::Services, path: &str) -> Option<std::result::Result<effectcraft_project::Footage, String>> {
    let ext = std::path::Path::new(path).extension().and_then(|e| e.to_str()).unwrap_or("").to_ascii_lowercase();
    if !DATA_EXTENSIONS.contains(&ext.as_str()) {
        return None;
    }
    Some((|| {
        let bytes = services.read_file(path).map_err(|e| e.to_string())?;
        let text = String::from_utf8(bytes).map_err(|_| "data files must be UTF-8 text".to_string())?;
        if ext == "json" {
            serde_json::from_str::<Value>(text.trim_start_matches('\u{feff}')).map_err(|e| format!("invalid JSON: {e}"))?;
        }
        Ok(effectcraft_project::Footage { path: path.to_string(), kind: FootageKind::Data, codec: ext.to_uppercase(), data: Some(text), ..Default::default() })
    })())
}

fn project_settings(s: &mut Session, p: &Value) -> Result<Value> {
    s.edit("Project Settings", None, |proj, _| {
        if let Some(b) = str_p(p, "bitDepth") {
            proj.settings.bit_depth = match b {
                "8" | "8bpc" | "8 bpc" => effectcraft_project::BitDepth::Bpc8,
                "16" | "16bpc" | "16 bpc" => effectcraft_project::BitDepth::Bpc16,
                "32" | "32bpc" | "32 bpc" => effectcraft_project::BitDepth::Bpc32,
                _ => return Err(bad("file.projectSettings", "bitDepth must be 8, 16 or 32")),
            };
        } else if let Some(n) = p.get("bitDepth").and_then(Value::as_u64) {
            proj.settings.bit_depth = match n {
                16 => effectcraft_project::BitDepth::Bpc16,
                32 => effectcraft_project::BitDepth::Bpc32,
                _ => effectcraft_project::BitDepth::Bpc8,
            };
        }
        if let Some(l) = p.get("linearize").and_then(Value::as_bool) {
            proj.settings.linearize = l;
        }
        if let Some(l) = p.get("blendLinear").or_else(|| p.get("blendColorsUsing1Gamma")).and_then(Value::as_bool) {
            proj.settings.blend_linear = l;
        }
        use effectcraft_project::{ColorEngine, ColorSpace, HdrMode};
        let cmd = "file.projectSettings";
        if let Some(e) = str_p(p, "colorEngine") {
            let engine = match e.to_ascii_lowercase().replace([' ', '-', '_'], "").as_str() {
                "adobe" | "adobemanaged" | "builtin" => ColorEngine::Adobe,
                "ocio" | "ociomanaged" => ColorEngine::Ocio,
                _ => return Err(bad(cmd, format!("colorEngine: adobe|ocio, not `{e}`"))),
            };
            if engine == ColorEngine::Ocio && proj.settings.color_engine != ColorEngine::Ocio {
                // The OCIO built-in config works in ACES and renders the display through its
                // tone-mapped view.
                if !proj.settings.working_space.is_some_and(|w| w.is_linear()) {
                    proj.settings.working_space = Some(ColorSpace::AcesCg);
                }
                if proj.settings.hdr == HdrMode::Clip {
                    proj.settings.hdr = HdrMode::ToneMap;
                }
            }
            proj.settings.color_engine = engine;
        }
        if let Some(w) = p.get("workingSpace") {
            let ids = ColorSpace::WORKING.iter().map(|c| c.id()).collect::<Vec<_>>().join("|");
            proj.settings.working_space = match w.as_str() {
                None | Some("none" | "None" | "") => None,
                Some(n) => Some(
                    ColorSpace::parse(n).filter(|c| ColorSpace::WORKING.contains(c)).ok_or_else(|| bad(cmd, format!("workingSpace: none|{ids}, not `{n}`")))?,
                ),
            };
        }
        if proj.settings.color_engine == ColorEngine::Ocio && !proj.settings.working_space.is_some_and(|w| w.is_linear()) {
            return Err(bad(cmd, "the OCIO built-in config's working spaces are acescg and aces2065"));
        }
        if let Some(h) = str_p(p, "hdr") {
            proj.settings.hdr = match h.to_ascii_lowercase().replace([' ', '-', '_'], "").as_str() {
                "clip" | "off" | "none" => HdrMode::Clip,
                "compand" => HdrMode::Compand,
                "tonemap" | "tonemapped" => HdrMode::ToneMap,
                _ => return Err(bad(cmd, format!("hdr: clip|compand|toneMap, not `{h}`"))),
            };
        }
        if let Some(o) = p.get("outputSpace") {
            proj.settings.output_space = match o.as_str() {
                None | Some("none" | "None" | "" | "default") => None,
                Some(n) => Some(ColorSpace::parse(n).ok_or_else(|| bad(cmd, format!("outputSpace: srgb|rec709|rec2020|p3|rec2100pq|rec2100hlg, not `{n}`")))?),
            };
        }
        if let Some(r) = p.get("renderer").or_else(|| p.get("gpuAcceleration")) {
            proj.settings.gpu_acceleration = match r {
                Value::Bool(b) => *b,
                Value::String(s) => match effectcraft_render::Backend::parse(s) {
                    Some(effectcraft_render::Backend::Cpu) => false,
                    Some(_) => true,
                    None => return Err(bad("file.projectSettings", format!("renderer: gpu|software, not `{s}`"))),
                },
                _ => return Err(bad("file.projectSettings", "renderer: gpu|software")),
            };
        }
        if let Some(t) = str_p(p, "timeDisplay") {
            proj.settings.time_display = effectcraft_project::TimeDisplayStyle::parse(t)
                .ok_or_else(|| bad("file.projectSettings", format!("timeDisplay: timecode|frames|feet35|feet16, not `{t}`")))?;
        }
        Ok(())
    })?;
    Ok(serde_json::to_value(&s.project.settings).unwrap_or_default())
}

/// Video Rendering and Effects: report or set the renderer (Mercury GPU Acceleration when a GPU
/// adapter exists, else Mercury Software Only).
fn render_backend(s: &mut Session, p: &Value) -> Result<Value> {
    if let Some(b) = p.get("backend").or_else(|| p.get("renderer")) {
        let gpu = match b {
            Value::Bool(b) => *b,
            Value::String(v) => match effectcraft_render::Backend::parse(v) {
                Some(effectcraft_render::Backend::Cpu) => false,
                Some(_) => true,
                None => return Err(bad("render.backend", format!("backend: gpu|cpu, not `{v}`"))),
            },
            _ => return Err(bad("render.backend", "backend: gpu|cpu")),
        };
        if gpu != s.project.settings.gpu_acceleration {
            s.edit("Project Settings", None, |proj, _| {
                proj.settings.gpu_acceleration = gpu;
                Ok(())
            })?;
        }
    }
    Ok(backend_status(s))
}

/// The renderer setting and what renders with it.
pub fn backend_status(s: &Session) -> Value {
    let adapter = s.accel.as_ref().map(|a| a.name());
    let gpu = s.project.settings.gpu_acceleration;
    // Why it renders on the CPU (#262).
    let why = if !gpu {
        Some("the project's renderer is Mercury Software Only".to_string())
    } else if adapter.is_none() {
        Some(s.accel_note.clone().unwrap_or_else(|| "no GPU compositor is attached".into()))
    } else {
        None
    };
    json!({
        "renderer": if gpu { "Mercury GPU Acceleration" } else { "Mercury Software Only" },
        "gpuAcceleration": gpu,
        "adapter": adapter,
        "active": if gpu && adapter.is_some() { "gpu" } else { "cpu" },
        "why": why,
    })
}

fn cycle_depth(s: &mut Session, _: &Value) -> Result<Value> {
    s.edit("Project Bit Depth", None, |proj, _| {
        proj.settings.bit_depth = proj.settings.bit_depth.next();
        Ok(())
    })?;
    Ok(json!(s.project.settings.bit_depth.label()))
}

pub fn specs() -> Vec<CommandSpec> {
    vec![
        cmd!("file.newProject", "New Project", ["File", "New"], Some("Cmd+Alt+N"), "{}", always, new_project),
        cmd!("file.openDemoProject", "Open Demo Project", ["Help"], None, "{}", always, demo),
        cmd!("file.open", "Open Project...", ["File"], Some("Cmd+O"), "{path}", always, open),
        cmd!("file.save", "Save", ["File"], Some("Cmd+S"), "{path?}", always, save),
        cmd!("file.saveAs", "Save As...", ["File", "Save As"], Some("Cmd+Shift+S"), "{path}", always, save_as),
        cmd!("file.incrementAndSave", "Increment and Save", ["File"], Some("Cmd+Alt+Shift+S"), "{}", has_path, increment_save),
        cmd!("file.revert", "Revert", ["File"], None, "{}", has_path, revert),
        cmd!(
            "file.import",
            "File...",
            ["File", "Import"],
            Some("Cmd+I"),
            "{paths: [string], importAs?: footage|composition|compositionLayerSizes (Photoshop, PDF, Illustrator and EPS files), layer?: name|index (footage of one Photoshop layer), page?: number from 1 (PDF / Illustrator page), drag?: bool (dropped files: Settings ▸ Import ▸ Default Drag Import As), addToComp?: bool (also add them to the active comp, at time?, index?, position? as in layer.addItem), background?: bool (probe the files in a background job, jobs.list / jobs.wait; returns {job})}",
            always,
            import_cmd
        ),
        cmd!(
            "file.projectSettings",
            "Project Settings...",
            ["File"],
            Some("Cmd+Alt+Shift+K"),
            "{bitDepth?: 8|16|32, colorEngine?: adobe|ocio, workingSpace?: none|srgb|rec709|rec2020|p3|acescg|aces2065, linearize?, blendLinear?, hdr?: clip|compand|toneMap, outputSpace?: srgb|rec709|rec2020|p3|rec2100pq|rec2100hlg, renderer?: gpu|software, timeDisplay?: timecode|frames|feet35|feet16}",
            always,
            project_settings
        ),
        cmd!("file.cycleBitDepth", "Cycle Project Bit Depth", [], None, "{}", always, cycle_depth),
        cmd!("render.backend", "Video Rendering and Effects", [], None, "{backend?: gpu|cpu}", always, render_backend),
    ]
}