import assert from "node:assert/strict";
import { test } from "node:test";

import {
  runAddToPlaylistCommand,
  runCreatePlaylistCommand,
  runRemoveFromPlaylistCommand,
  runSearchAndAddCommand,
  searchAndAdd,
  validateTrackUris
} from "../src/playlists.js";
import type { CliDeps } from "../src/cli.js";
import type { SpotifyPlaylist } from "../src/types.js";

function createDeps(): { deps: CliDeps; stdout: () => string; stderr: () => string } {
  let stdout = "";
  let stderr = "";
  return {
    deps: {
      stdout: { write: (chunk: string) => { stdout += chunk; return true; } },
      stderr: { write: (chunk: string) => { stderr += chunk; return true; } }
    },
    stdout: () => stdout,
    stderr: () => stderr
  };
}

function playlist(name: string): SpotifyPlaylist {
  return {
    id: "playlist-id",
    uri: "spotify:playlist:playlist-id",
    name,
    public: false,
    owner: { id: "owner-id" },
    external_urls: { spotify: "https://open.spotify.com/playlist/playlist-id" }
  };
}

test("create playlist defaults private unless public flag is present", async () => {
  const io = createDeps();
  let observed: { name: string; public?: boolean; description?: string } | undefined;

  await runCreatePlaylistCommand(
    { command: "create-playlist", positional: ["My", "Mix"], json: true, public: false, description: "desc" },
    io.deps,
    {
      createPlaylist: async (name, options) => {
        observed = { name, ...options };
        return playlist(name);
      },
      addItemsToPlaylist: async () => [],
      removeItemsFromPlaylist: async () => [],
      searchTracks: async () => []
    }
  );

  assert.deepEqual(observed, { name: "My Mix", public: false, description: "desc" });
  assert.equal(JSON.parse(io.stdout()).playlist.id, "playlist-id");
});

test("create playlist treats omitted public flag as private", async () => {
  const io = createDeps();
  let observedPublic: boolean | undefined;

  await runCreatePlaylistCommand(
    { command: "create-playlist", positional: ["My Mix"], json: true },
    io.deps,
    {
      createPlaylist: async (name, options) => {
        observedPublic = options?.public;
        return playlist(name);
      },
      addItemsToPlaylist: async () => [],
      removeItemsFromPlaylist: async () => [],
      searchTracks: async () => []
    }
  );

  assert.equal(observedPublic, false);
});

test("validates spotify track uris", () => {
  assert.deepEqual(validateTrackUris(["spotify:track:1"]), ["spotify:track:1"]);
  assert.throws(() => validateTrackUris(["spotify:album:1"]), /Invalid Spotify track URI/);
});

test("add to playlist outputs mutation summary", async () => {
  const io = createDeps();
  let observedUris: string[] = [];
  await runAddToPlaylistCommand(
    { command: "add-to-playlist", positional: ["playlist-id", "spotify:track:1"], json: true, public: false },
    io.deps,
    {
      createPlaylist: async () => playlist("unused"),
      addItemsToPlaylist: async (_playlistId, uris) => {
        observedUris = uris;
        return [{ snapshot_id: "snap" }];
      },
      removeItemsFromPlaylist: async () => [],
      searchTracks: async () => []
    }
  );

  assert.deepEqual(observedUris, ["spotify:track:1"]);
  assert.deepEqual(JSON.parse(io.stdout()), { playlistId: "playlist-id", count: 1, snapshotIds: ["snap"] });
});

test("remove from playlist outputs mutation summary", async () => {
  const io = createDeps();
  await runRemoveFromPlaylistCommand(
    { command: "remove-from-playlist", positional: ["playlist-id", "spotify:track:1"], json: false, public: false },
    io.deps,
    {
      createPlaylist: async () => playlist("unused"),
      addItemsToPlaylist: async () => [],
      removeItemsFromPlaylist: async () => [{ snapshot_id: "snap" }],
      searchTracks: async () => []
    }
  );

  assert.equal(io.stdout(), "Removed 1 track(s) from playlist-id.\n");
});

test("searchAndAdd adds first matches and records misses", async () => {
  let observedUris: string[] = [];
  const result = await searchAndAdd("playlist-id", ["found", "missing"], {
    searchTracks: async (query) => query === "found"
      ? [{ id: "track-id", uri: "spotify:track:track-id", name: "Song", artists: [{ name: "Artist" }] }]
      : [],
    addItemsToPlaylist: async (_playlistId, uris) => {
      observedUris = uris;
      return [{ snapshot_id: "snap" }];
    }
  });

  assert.deepEqual(observedUris, ["spotify:track:track-id"]);
  assert.deepEqual(result, {
    added: [{ query: "found", uri: "spotify:track:track-id", name: "Song", artists: ["Artist"] }],
    missed: ["missing"],
    snapshotIds: ["snap"]
  });
});

test("search-and-add command writes JSON summary", async () => {
  const io = createDeps();
  await runSearchAndAddCommand(
    { command: "search-and-add", positional: ["playlist-id", "found"], json: true, public: false },
    io.deps,
    {
      createPlaylist: async () => playlist("unused"),
      addItemsToPlaylist: async () => [{ snapshot_id: "snap" }],
      removeItemsFromPlaylist: async () => [],
      searchTracks: async () => [{ id: "track-id", uri: "spotify:track:track-id", name: "Song", artists: [{ name: "Artist" }] }]
    }
  );

  assert.equal(JSON.parse(io.stdout()).added[0].uri, "spotify:track:track-id");
});