//! Library preferences: import defaults (raw / other / per camera) applied by import, and their
//! persistence in prefs.json.

use std::path::{Path, PathBuf};

use lightcraft_catalog::MediaKind;
use lightcraft_develop::Preset;
use serde_json::json;

use crate::Session;

fn temp_dir(tag: &str) -> PathBuf {
    let d = std::env::temp_dir().join(format!("lc-prefs-{tag}-{}", std::process::id()));
    let _ = std::fs::remove_dir_all(&d);
    std::fs::create_dir_all(&d).unwrap();
    d
}

fn user_preset(id: &str, settings: serde_json::Value) -> Preset {
    Preset { id: id.into(), name: id.into(), group: "User Presets".into(), settings, favorite: false, builtin: false }
}

fn with_presets(s: &mut Session) {
    s.presets.push(user_preset("user.rawlook", json!({"light": {"exposure": 0.5}, "effects": {"clarity": 20.0}})));
    s.presets.push(user_preset("user.canonlook", json!({"light": {"contrast": 35.0}})));
    s.presets.push(user_preset("user.jpeglook", json!({"color": {"vibrance": 15.0}})));
}

fn dng(dir: &Path, name: &str, make: &str, model: &str) {
    let meta = lightcraft_meta::Metadata { make: Some(make.into()), model: Some(model.into()), ..Default::default() };
    std::fs::write(dir.join(name), crate::tests_xmp::synthetic_dng_with(None, meta)).unwrap();
}

fn png(path: &Path) {
    let (w, h) = (24usize, 16usize);
    let data: Vec<[u8; 4]> = (0..w * h).map(|i| [(i * 7) as u8, (i * 3) as u8, 90, 255]).collect();
    let img = lightcraft_raster::Rgba8 { width: w, height: h, data };
    let bytes = lightcraft_codecs::encode_png(&lightcraft_codecs::EncodeImage::rgba8(&img), &lightcraft_codecs::EncodeMeta::default()).unwrap();
    std::fs::write(path, bytes).unwrap();
}

fn photo_named<'a>(s: &'a Session, name: &str) -> &'a lightcraft_catalog::Photo {
    s.catalog.photos().find(|p| p.file_name == name).unwrap_or_else(|| panic!("{name} not imported"))
}

#[test]
fn raw_and_other_defaults_are_applied_on_import() {
    let src = temp_dir("apply");
    dng(&src, "nikon.dng", "Nikon", "Z 9");
    dng(&src, "canon.dng", "Canon", "EOS R5");
    png(&src.join("plain.png"));
    let mut s = Session::new().with_fs();
    with_presets(&mut s);
    let r = s
        .execute(
            "library.preferences",
            &json!({"import": {"rawPreset": "user.rawlook", "otherPreset": "user.jpeglook", "perCamera": true,
                "cameras": [{"camera": "Canon EOS R5", "preset": "user.canonlook"}]}}),
        )
        .unwrap();
    assert_eq!(r["import"]["rawPreset"], "user.rawlook", "{r}");
    assert!(s.execute("library.preferences", &json!({"import": {"rawPreset": "nope"}})).is_err(), "unknown presets are rejected");

    s.execute("library.import", &json!({"paths": [src.to_string_lossy()]})).unwrap();
    assert_eq!(s.catalog.len(), 3);
    let nikon = photo_named(&s, "nikon.dng");
    assert_eq!(nikon.kind, MediaKind::Raw);
    assert_eq!(nikon.meta.camera, "Nikon Z 9");
    assert_eq!((nikon.develop.light.exposure, nikon.develop.effects.clarity), (0.5, 20.0), "global raw default");
    assert_eq!(nikon.develop.detail.sharpen_amount, 40.0, "raw camera defaults stay underneath the preset");
    assert!(!nikon.is_edited(), "the default look counts as unedited");
    assert!(!crate::import::has_import_look(nikon), "a preset look isn't what the embedded preview shows");
    let canon = photo_named(&s, "canon.dng");
    assert_eq!((canon.develop.light.contrast, canon.develop.light.exposure), (35.0, 0.0), "per-camera default wins");
    let plain = photo_named(&s, "plain.png");
    assert_eq!((plain.develop.color.vibrance, plain.develop.light.exposure), (15.0, 0.0), "non-raw default");

    // editing then Reset returns to the default look
    let id = nikon.id;
    s.execute("library.select", &json!({"ids": [id.0]})).unwrap();
    s.execute("develop.set", &json!({"control": "light.exposure", "value": 2.0})).unwrap();
    assert!(s.catalog.photo(id).unwrap().is_edited());
    s.execute("develop.reset", &json!({})).unwrap();
    let p = s.catalog.photo(id).unwrap();
    assert_eq!(p.develop.light.exposure, 0.5);
    assert!(!p.is_edited());

    // per-camera off: the Canon gets the global raw default; clearing it gives the plain defaults
    let mut s2 = Session::new().with_fs();
    with_presets(&mut s2);
    s2.execute("library.preferences", &json!({"camera": {"camera": "canon eos r5", "preset": "user.canonlook"}})).unwrap();
    s2.execute("library.import", &json!({"paths": [src.join("canon.dng").to_string_lossy()]})).unwrap();
    let c = s2.catalog.photos().next().unwrap();
    assert_eq!(c.develop.light.contrast, 0.0, "per-camera defaults are off unless enabled");
    assert!(c.import_look.is_none());
    let _ = std::fs::remove_dir_all(&src);
}

#[test]
fn preferences_persist_with_the_library() {
    let lib = temp_dir("lib");
    {
        let mut s = Session::new().with_fs();
        s.open_library(&lib, false).unwrap();
        with_presets(&mut s);
        s.persist().unwrap(); // presets.json
        s.execute("library.xmpPreferences", &json!({"autoWrite": true})).unwrap();
        s.execute(
            "library.preferences",
            &json!({"import": {"rawPreset": "user.rawlook", "perCamera": true}, "camera": {"camera": "Canon EOS R5", "preset": "user.canonlook"}, "cacheMb": 512}),
        )
        .unwrap();
        s.close_library().unwrap();
    }
    let mut s = Session::new().with_fs();
    s.open_library(&lib, false).unwrap();
    assert!(s.xmp.auto_write);
    assert_eq!(s.import_defaults.raw_preset.as_deref(), Some("user.rawlook"));
    assert!(s.import_defaults.per_camera);
    assert_eq!(s.import_defaults.cameras.len(), 1);
    assert_eq!(s.import_defaults.preset_for(true, "Canon EOS R5"), Some("user.canonlook"));
    assert_eq!(s.cache_mb, 512);
    assert_eq!(s.cache_bytes(), 512 << 20);
    let r = s.execute("library.preferences", &json!({})).unwrap();
    assert_eq!(r["cacheMb"], 512);
    assert_eq!(r["persistent"], true);
    // older prefs.json files (snake_case `last_export`, no import section) still load
    std::fs::write(lib.join("prefs.json"), r#"{"xmp": {"autoWrite": false}, "last_export": {"format": "png"}}"#).unwrap();
    let mut s = Session::new().with_fs();
    s.open_library(&lib, false).unwrap();
    assert_eq!(s.last_export, Some(json!({"format": "png"})));
    assert_eq!(s.import_defaults, Default::default());
    let _ = std::fs::remove_dir_all(&lib);
}