import { beforeEach, describe, expect, it, vi } from "vitest";
import type { AssetEntry, SoundDef } from "@nengine/core";
import { createSoundPlayer, soundSrcAssetId, soundToAudioParams } from "../src/sound.js";

const def = (overrides: Partial<SoundDef> = {}): SoundDef => ({ id: "till", synth: { wave: "square", freq: 110, durationMs: 90, gain: 0.4 }, ...overrides });

beforeEach(() => {
  vi.useFakeTimers();
});

describe("soundToAudioParams (pure def → Web Audio mapping)", () => {
  it("maps a synth def to oscillator parameters", () => {
    expect(soundToAudioParams(def())).toEqual({
      wave: "square",
      freq: 110,
      durationMs: 90,
      gain: 0.4,
    });
  });

  it("defaults gain when absent", () => {
    const params = soundToAudioParams(def({ synth: { wave: "sine", freq: 520, durationMs: 160 } }));
    expect(params?.gain).toBe(0.3);
  });

  it("carries slideTo when present and omits it when absent", () => {
    expect(soundToAudioParams(def({ synth: { wave: "sine", freq: 880, durationMs: 120, slideTo: 1320 } }))?.slideTo).toBe(1320);
    expect(soundToAudioParams(def())?.slideTo).toBeUndefined();
  });

  it("returns undefined for a def with only a reserved src (no synth)", () => {
    expect(soundToAudioParams({ id: "voice", src: "reserved.ogg" })).toBeUndefined();
  });
});

describe("soundSrcAssetId (pure src mapping, D31)", () => {
  it("returns the asset id for a def with src", () => {
    expect(soundSrcAssetId({ id: "till", src: "drop-1" })).toBe("drop-1");
    expect(soundSrcAssetId({ id: "both", synth: { wave: "sine", freq: 1, durationMs: 1 }, src: "click-1" })).toBe("click-1");
  });

  it("returns undefined for a synth-only def or a blank src", () => {
    expect(soundSrcAssetId(def())).toBeUndefined();
    expect(soundSrcAssetId({ id: "x", src: "" })).toBeUndefined();
  });
});

describe("createSoundPlayer (event wiring + lazy AudioContext)", () => {
  function fakeAudioContext(): AudioContext & {
    nodeCalls: { start: any[]; stop: any[]; disconnect: any[] };
    transitionLog: [string, number, number][];
    gainValue: number;
  } {
    const transitionLog: [string, number, number][] = [];
    let gainValue = 0;
    const nodeCalls = { start: [] as any[], stop: [] as any[], disconnect: [] as any[] };
    const createGainLike = () => {
      return {
        setValueAtTime(v: number, t: number): void {
          gainValue = v;
          transitionLog.push(["setValueAtTime", v, t]);
        },
        linearRampToValueAtTime(v: number, t: number): void {
          gainValue = v;
          transitionLog.push(["linearRampToValueAtTime", v, t]);
        },
        get value(): number {
          return gainValue;
        },
        set value(v: number) {
          gainValue = v;
        },
      };
    };
    const sharedGain = createGainLike();
    const createNode = () => {
      const freqGain = createGainLike();
      return {
        type: "",
        frequency: {
          setValueAtTime(v: number, t: number): void {
            transitionLog.push(["setValueAtTime", v, t]);
          },
          linearRampToValueAtTime(v: number, t: number): void {
            transitionLog.push(["linearRampToValueAtTime", v, t]);
          },
        },
        gain: sharedGain,
        connect(): void {},
        disconnect(): void {
          nodeCalls.disconnect.push({});
        },
        start(...args: any[]): void {
          nodeCalls.start.push(args);
        },
        stop(...args: any[]): void {
          nodeCalls.stop.push(args);
        },
      };
    };
    const mainNode = createNode();
    return {
      currentTime: 1.25,
      state: "running",
      destination: {},
      createOscillator: () => createNode(),
      createGain: () => ({ gain: createGainLike(), connect(): void {} }),
      decodeAudioData: async () => {
        throw new Error("cannot decode fake ogg");
      },
      resume: async () => undefined,
      close: async () => undefined,
      nodeCalls,
      transitionLog,
      gainValue,
    } as unknown as AudioContext & {
      nodeCalls: { start: any[]; stop: any[]; disconnect: any[] };
      transitionLog: [string, number, number][];
      gainValue: number;
    };
  }

  it("ignores non-sound-play events and unknown sound ids", () => {
    const player = createSoundPlayer(fakeAudioContext);
    player.setCatalog([def()]);
    player.onEvent({ event: "player-intent", payload: { soundId: "till" } });
    player.onEvent({ event: "sound-play", payload: { soundId: "nope" } });
    player.destroy();
  });

  it("creates the AudioContext lazily only on play", () => {
    let created = 0;
    const player = createSoundPlayer(() => {
      created += 1;
      return fakeAudioContext();
    });
    expect(created).toBe(0);
    player.setCatalog([def()]);
    player.onEvent({ event: "sound-play", payload: { soundId: "till" } });
    expect(created).toBe(1);
    player.onEvent({ event: "sound-play", payload: { soundId: "till" } });
    expect(created).toBe(1);
    player.destroy();
  });

  it("synthesizes the resolved def with ramp parameters on a sound-play frame", () => {
    const createdNodes: { freq: number; slideTo?: number; durationMs: number; gain: number }[] = [];
    const context = fakeAudioContext();
    const ctx = context as unknown as {
      createOscillator(): { type: string; frequency: { setValueAtTime(v: number, t: number): void; linearRampToValueAtTime(v: number, t: number): void }; connect(): void; start(): void; stop(): void };
    };
    const orig = context.createOscillator;
    ctx.createOscillator = () => {
      const osc = orig.call(context) as { type: string; frequency: { setValueAtTime(v: number, t: number): void; linearRampToValueAtTime(v: number, t: number): void }; connect(): void; start(): void; stop(): void };
      osc.frequency.setValueAtTime = (v: number) => {
        createdNodes[createdNodes.length] = { freq: v, durationMs: 120, gain: 0.5 };
      };
      osc.frequency.linearRampToValueAtTime = (v: number) => {
        const last = createdNodes[createdNodes.length - 1];
        if (last) last.slideTo = v;
      };
      return osc;
    };
    const player = createSoundPlayer(() => context);
    player.setCatalog([def({ synth: { wave: "sine", freq: 880, durationMs: 120, gain: 0.5, slideTo: 1320 } })]);
    player.onEvent({ event: "sound-play", payload: { soundId: "till" } });
    expect(createdNodes[0]).toEqual({ freq: 880, durationMs: 120, gain: 0.5, slideTo: 1320 });
    player.destroy();
  });

  it("prime() creates the context on a user gesture without playing", () => {
    let created = 0;
    const player = createSoundPlayer(() => {
      created += 1;
      return fakeAudioContext();
    });
    player.prime();
    expect(created).toBe(1);
    player.destroy();
  });

  it("silently skips a src def whose audio asset is missing from the table", () => {
    let created = 0;
    const player = createSoundPlayer(() => {
      created += 1;
      return fakeAudioContext();
    });
    player.setCatalog([{ id: "till", src: "drop-1" }]);
    player.onEvent({ event: "sound-play", payload: { soundId: "till" } });
    expect(created).toBe(0);
    player.destroy();
  });

  it("silently skips a src def whose asset kind is not audio", () => {
    const assets: Record<string, AssetEntry> = { "drop-1": { kind: "image", mime: "image/png", data: "x" } };
    let created = 0;
    const player = createSoundPlayer(() => {
      created += 1;
      return fakeAudioContext();
    });
    player.setCatalog([{ id: "till", src: "drop-1" }]);
    player.setAssets(assets);
    player.onEvent({ event: "sound-play", payload: { soundId: "till" } });
    expect(created).toBe(0);
    player.destroy();
  });

  it("src takes precedence over synth at play time", () => {
    const assets: Record<string, AssetEntry> = { "click-1": { kind: "audio", mime: "audio/ogg", data: "T2dnUw==" } };
    const createdNodes: { freq?: number }[] = [];
    const context = fakeAudioContext();
    const ctx = context as unknown as {
      createOscillator(): { type: string; frequency: { setValueAtTime(v: number): void }; connect(): void; start(): void; stop(): void };
    };
    const orig = context.createOscillator;
    ctx.createOscillator = () => {
      const osc = orig.call(context) as { type: string; frequency: { setValueAtTime(v: number): void }; connect(): void; start(): void; stop(): void };
      osc.frequency.setValueAtTime = (v: number) => {
        createdNodes[createdNodes.length] = { freq: v };
      };
      return osc;
    };
    const player = createSoundPlayer(() => context);
    player.setCatalog([
      { id: "both", synth: { wave: "sine", freq: 880, durationMs: 100 }, src: "click-1" },
    ]);
    player.setAssets(assets);
    player.onEvent({ event: "sound-play", payload: { soundId: "both" } });
    // src path: decode fails (fake OGG bytes) → silently skipped, no oscillator
    expect(createdNodes).toHaveLength(0);
    player.destroy();
  });

  it("TR-11.1: playBgm('A') → playBgm('B') → stopBgm(200): currentBgm transitions and fade transitions logged", () => {
    const context = fakeAudioContext();
    const player = createSoundPlayer(() => context);
    player.setCatalog([
      { id: "A", synth: { wave: "sine", freq: 440, durationMs: 500, gain: 0.6 } },
      { id: "B", synth: { wave: "triangle", freq: 660, durationMs: 500, gain: 0.5 } },
    ]);

    player.playBgm("A");
    expect(player.currentBgm()).toBe("A");

    player.playBgm("B");
    expect(player.currentBgm()).toBe("B");

    player.stopBgm(200);
    expect(player.currentBgm()).toBe("B");

    vi.advanceTimersByTime(300);
    expect(player.currentBgm()).toBeNull();

    const rampCount = context.transitionLog.filter(([op]) => op === "linearRampToValueAtTime").length;
    expect(rampCount).toBeGreaterThanOrEqual(2);

    player.destroy();
  });

  it("TR-11.2: setBgmVolume(0.3) applies gain value", () => {
    const context = fakeAudioContext();
    const player = createSoundPlayer(() => context);
    player.setCatalog([
      { id: "bgm1", synth: { wave: "sine", freq: 440, durationMs: 500, gain: 0.6 } },
    ]);

    player.playBgm("bgm1");
    player.setBgmVolume(0.3);

    const setValCalls = context.transitionLog.filter(
      ([op, v]) => op === "setValueAtTime" && Math.abs(v - 0.3) < 0.0001
    );
    expect(setValCalls.length).toBeGreaterThanOrEqual(1);

    player.destroy();
  });

  it("bgm-play and bgm-stop events dispatch to player methods", () => {
    const context = fakeAudioContext();
    const player = createSoundPlayer(() => context);
    player.setCatalog([
      { id: "track1", synth: { wave: "sine", freq: 440, durationMs: 500, gain: 0.6 } },
    ]);

    player.onEvent({ event: "bgm-play", payload: { soundId: "track1", fadeMs: 150 } });
    expect(player.currentBgm()).toBe("track1");

    player.onEvent({ event: "bgm-stop", payload: { fadeMs: 100 } });
    vi.advanceTimersByTime(200);
    expect(player.currentBgm()).toBeNull();

    player.destroy();
  });

  it("playBgm with a missing asset never claims the BGM slot and stopBgm clears cleanly", () => {
    const player = createSoundPlayer(fakeAudioContext);
    player.setCatalog([{ id: "ghost", src: "missing-asset" }]);
    player.setAssets({});
    player.playBgm("ghost");
    expect(player.currentBgm()).toBeNull(); // nothing started — no stale id
    player.stopBgm(100);
    expect(player.currentBgm()).toBeNull();
    player.destroy();
  });

  it("a src whose asset cannot be decoded stays silent and stops cleanly", async () => {
    const player = createSoundPlayer(fakeAudioContext); // fake decodeAudioData throws
    player.setCatalog([{ id: "track1", src: "res-1" }]);
    player.setAssets({ "res-1": { kind: "audio", mime: "audio/ogg", data: "bm90LW9nZzE=" } });
    player.playBgm("track1");
    await vi.runAllTimersAsync(); // flush the failing decode promise
    expect(player.currentBgm()).toBeNull();
    player.stopBgm(100);
    expect(player.currentBgm()).toBeNull();
    player.destroy();
  });

  it("a failed BGM does not prevent a later valid BGM from playing", () => {
    const player = createSoundPlayer(fakeAudioContext);
    player.setCatalog([
      { id: "ghost", src: "missing-asset" },
      { id: "real", synth: { wave: "sine", freq: 440, durationMs: 500, gain: 0.6 } },
    ]);
    player.playBgm("ghost");
    player.playBgm("real");
    expect(player.currentBgm()).toBe("real");
    player.destroy();
  });
});