/**
 * Preload service tests
 *
 * TRACES: UR-004, UR-011 | DR-006, DR-015
 */

import { describe, it, expect, beforeEach, vi } from "vitest";
import { preloadUpcomingTracks, updateCacheConfig, getCacheConfig } from "./preload";
import type { CacheConfig } from "$lib/api/bindings";

// updateCacheConfig now takes a full CacheConfig (matches the backend command)
function makeConfig(overrides: Partial<CacheConfig> = {}): CacheConfig {
  return {
    queuePrecacheEnabled: true,
    queuePrecacheCount: 5,
    albumAffinityEnabled: false,
    albumAffinityThreshold: 0.75,
    storageLimit: 2 * 1024 * 1024 * 1024,
    wifiOnly: false,
    temporaryTtlHours: 24 * 7,
    ...overrides,
  };
}

vi.mock("@tauri-apps/api/core", () => ({
  invoke: vi.fn(async (command: string, args?: any) => {
    if (command === "player_preload_upcoming") {
      return {
        queuedCount: 3,
        alreadyDownloaded: 2,
        skipped: 1,
      };
    }
    if (command === "player_set_cache_config") {
      return undefined;
    }
    if (command === "player_get_cache_config") {
      return {
        queuePrecacheEnabled: true,
        queuePrecacheCount: 5,
        albumAffinityEnabled: true,
        albumAffinityThreshold: 0.8,
        storageLimit: 1024 * 1024 * 1024,
        wifiOnly: false,
      };
    }
    return null;
  }),
}));

vi.mock("$lib/stores/auth", () => ({
  auth: {
    getUserId: vi.fn(() => "user-123"),
  },
}));

describe("preload service", () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  describe("preloadUpcomingTracks", () => {
    it("should preload tracks without options", async () => {
      await expect(preloadUpcomingTracks()).resolves.toBeUndefined();
    });

    it("should invoke correct backend command", async () => {
      const { invoke } = await import("@tauri-apps/api/core");
      const invokeSpy = vi.mocked(invoke);

      await preloadUpcomingTracks();

      const call = invokeSpy.mock.calls.find((c) => c[0] === "player_preload_upcoming");
      expect(call).toBeDefined();
    });

    it("should include userId in command", async () => {
      const { invoke } = await import("@tauri-apps/api/core");
      const invokeSpy = vi.mocked(invoke);

      await preloadUpcomingTracks();

      const call = invokeSpy.mock.calls.find((c) => c[0] === "player_preload_upcoming");
      expect(call![1]).toHaveProperty("userId", "user-123");
    });

    it("should use override userId if provided", async () => {
      const { invoke } = await import("@tauri-apps/api/core");
      const invokeSpy = vi.mocked(invoke);

      await preloadUpcomingTracks({ userId: "user-456" });

      const call = invokeSpy.mock.calls.find((c) => c[0] === "player_preload_upcoming");
      expect(call![1]).toHaveProperty("userId", "user-456");
    });

    it("should skip if no active user", async () => {
      const { auth } = await import("$lib/stores/auth");
      const authModule = vi.mocked(auth);
      authModule.getUserId = vi.fn(() => null);

      const { invoke } = await import("@tauri-apps/api/core");
      const invokeSpy = vi.mocked(invoke);

      await preloadUpcomingTracks();

      const call = invokeSpy.mock.calls.find((c) => c[0] === "player_preload_upcoming");
      expect(call).toBeUndefined();
    });

    it("should handle preload result", async () => {
      // Should not throw even with result
      await expect(preloadUpcomingTracks()).resolves.toBeUndefined();
    });

    it("should handle errors gracefully", async () => {
      const { invoke } = await import("@tauri-apps/api/core");
      const invokeSpy = vi.mocked(invoke);

      invokeSpy.mockRejectedValueOnce(new Error("Backend error"));

      // Should not throw
      await expect(preloadUpcomingTracks()).resolves.toBeUndefined();
    });

    it("should support debug option", async () => {
      await expect(preloadUpcomingTracks({ debug: true })).resolves.toBeUndefined();
    });

    it("should support both debug and userId options", async () => {
      const { invoke } = await import("@tauri-apps/api/core");
      const invokeSpy = vi.mocked(invoke);

      await preloadUpcomingTracks({ debug: true, userId: "user-789" });

      const call = invokeSpy.mock.calls.find((c) => c[0] === "player_preload_upcoming");
      expect(call![1]).toHaveProperty("userId", "user-789");
    });
  });

  describe("updateCacheConfig", () => {
    it("should update cache config", async () => {
      const config = makeConfig({
        queuePrecacheEnabled: false,
        queuePrecacheCount: 10,
      });

      await expect(updateCacheConfig(config)).resolves.toBeUndefined();
    });

    it("should invoke correct backend command", async () => {
      const { invoke } = await import("@tauri-apps/api/core");
      const invokeSpy = vi.mocked(invoke);

      const config = makeConfig({ queuePrecacheEnabled: true });
      await updateCacheConfig(config);

      const call = invokeSpy.mock.calls.find((c) => c[0] === "player_set_cache_config");
      expect(call).toBeDefined();
      expect(call![1]).toHaveProperty("config", config);
    });

    it("should support overriding individual config options", async () => {
      const config = makeConfig({ wifiOnly: true });
      await expect(updateCacheConfig(config)).resolves.toBeUndefined();
    });

    it("should support all config options", async () => {
      const config = makeConfig({ wifiOnly: true, albumAffinityEnabled: false });

      await expect(updateCacheConfig(config)).resolves.toBeUndefined();
    });
  });

  describe("getCacheConfig", () => {
    it("should get cache config", async () => {
      const config = await getCacheConfig();

      expect(config).toBeDefined();
      expect(typeof config.queuePrecacheEnabled).toBe("boolean");
      expect(typeof config.queuePrecacheCount).toBe("number");
      expect(typeof config.albumAffinityEnabled).toBe("boolean");
      expect(typeof config.albumAffinityThreshold).toBe("number");
      expect(typeof config.storageLimit).toBe("number");
      expect(typeof config.wifiOnly).toBe("boolean");
    });

    it("should invoke correct backend command", async () => {
      const { invoke } = await import("@tauri-apps/api/core");
      const invokeSpy = vi.mocked(invoke);

      await getCacheConfig();

      const call = invokeSpy.mock.calls.find((c) => c[0] === "player_get_cache_config");
      expect(call).toBeDefined();
    });

    it("should return valid config structure", async () => {
      const config = await getCacheConfig();

      expect(config.queuePrecacheEnabled).toBe(true);
      expect(config.queuePrecacheCount).toBe(5);
      expect(config.albumAffinityEnabled).toBe(true);
      expect(config.albumAffinityThreshold).toBe(0.8);
      expect(config.storageLimit).toBe(1024 * 1024 * 1024);
      expect(config.wifiOnly).toBe(false);
    });
  });
});