import { mkdir, mkdtemp, readFile, rm, stat, writeFile } from 'node:fs/promises';
import os from 'node:os';
import path from 'node:path';

import { describe, expect, it } from 'vitest';

import {
  callIdFromStorageKey,
  LocalRecordingClient,
  normalizeRemoteRelativePath,
  type PulledRecordingFile,
  type RecordingStore,
  RecordingTransferService,
  type RemoteRecordingClient,
  type RemoteRecordingFile,
  storageKeyFromReadyPath
} from './transfer.js';

class MemoryRemote implements RemoteRecordingClient {
  readonly deleted: string[] = [];

  constructor(private readonly files: Map<string, Buffer>) {}

  async listReadyFiles(): Promise<RemoteRecordingFile[]> {
    return Array.from(this.files.entries()).map(([relativePath, content]) => ({
      relativePath,
      bytes: content.length
    }));
  }

  async pullFile(file: RemoteRecordingFile, localPath: string): Promise<void> {
    const content = this.files.get(file.relativePath);
    if (!content) {
      throw new Error('missing remote file');
    }
    await writeFile(localPath, content);
  }

  async deleteFile(file: RemoteRecordingFile): Promise<void> {
    this.deleted.push(file.relativePath);
    this.files.delete(file.relativePath);
  }
}

class MemoryStore implements RecordingStore {
  readonly ready: PulledRecordingFile[] = [];

  async markReady(input: { storageKey: string; storagePath: string; sourceKey: string; sha256: string; bytes: bigint }): Promise<void> {
    this.ready.push({
      relativePath: input.sourceKey,
      bytes: Number(input.bytes),
      localPath: input.storagePath,
      sha256: input.sha256
    });
  }
}

describe('recording transfer', () => {
  it('normalizes ready paths safely', () => {
    expect(normalizeRemoteRelativePath('/2026/06/21/call.wav.ready')).toBe('2026/06/21/call.wav.ready');
    expect(storageKeyFromReadyPath('2026/06/21/call.wav.ready')).toBe('2026/06/21/call.wav');
    expect(() => normalizeRemoteRelativePath('../call.wav.ready')).toThrow(/Unsafe/);
    expect(() => storageKeyFromReadyPath('2026/06/21/call.wav')).toThrow(/ready/);
  });

  it('derives call IDs from RTPEngine recording names', () => {
    expect(callIdFromStorageKey('2026/06/22/s28-1782091361841-kntoq1y9%40lisglosips-t-c68d7ba1de875f62-mix.wav')).toBe(
      's28-1782091361841-kntoq1y9@lisglosips-t'
    );
  });

  it('copies, hashes, marks ready, and deletes source only after verification', async () => {
    const root = await mkdtemp(path.join(os.tmpdir(), 'lisglosips-rec-'));
    const remote = new MemoryRemote(new Map([['2026/06/21/call.wav.ready', Buffer.from('audio-bytes')]]));
    const store = new MemoryStore();
    const service = new RecordingTransferService(remote, store, {
      localRoot: root,
      deleteSourceAfterCopy: true,
      maxFilesPerScan: 10
    });

    try {
      const result = await service.scanOnce();
      expect(result).toEqual({ moved: 1, skipped: 0, failed: 0 });
      expect(store.ready).toHaveLength(1);
      expect(store.ready[0]?.sha256).toMatch(/^[a-f0-9]{64}$/);
      expect(remote.deleted).toEqual(['2026/06/21/call.wav.ready']);
      expect(await readFile(path.join(root, '2026/06/21/call.wav'), 'utf8')).toBe('audio-bytes');
    } finally {
      await rm(root, { recursive: true, force: true });
    }
  });

  it('lists, copies, and deletes ready files from a local source directory', async () => {
    const root = await mkdtemp(path.join(os.tmpdir(), 'lisglosips-local-rec-'));
    const readyDir = path.join(root, 'ready');
    const outputDir = path.join(root, 'recordings');
    const sourcePath = path.join(readyDir, '2026', '08', '27', 'call.wav.ready');
    const client = new LocalRecordingClient({ readyDir });
    const store = new MemoryStore();
    const service = new RecordingTransferService(client, store, {
      localRoot: outputDir,
      deleteSourceAfterCopy: true,
      maxFilesPerScan: 10
    });

    try {
      await mkdir(path.dirname(sourcePath), { recursive: true });
      await writeFile(sourcePath, 'local-audio');
      await writeFile(path.join(readyDir, 'ignored.part'), 'incomplete');

      await expect(client.listReadyFiles()).resolves.toEqual([
        { relativePath: '2026/08/27/call.wav.ready', bytes: 11 }
      ]);
      await expect(service.scanOnce()).resolves.toEqual({ moved: 1, skipped: 0, failed: 0 });
      await expect(readFile(path.join(outputDir, '2026', '08', '27', 'call.wav'), 'utf8')).resolves.toBe('local-audio');
      await expect(stat(sourcePath)).rejects.toThrow();
    } finally {
      await rm(root, { recursive: true, force: true });
    }
  });

  it('keeps source file when local size verification fails', async () => {
    const root = await mkdtemp(path.join(os.tmpdir(), 'lisglosips-rec-'));
    const remote = new MemoryRemote(new Map([['bad.wav.ready', Buffer.from('abc')]]));
    const originalList = remote.listReadyFiles.bind(remote);
    remote.listReadyFiles = async () => (await originalList()).map((file) => ({ ...file, bytes: file.bytes + 1 }));
    const store = new MemoryStore();
    const service = new RecordingTransferService(remote, store, {
      localRoot: root,
      deleteSourceAfterCopy: true,
      maxFilesPerScan: 10
    });

    try {
      const result = await service.scanOnce();
      expect(result).toEqual({ moved: 0, skipped: 0, failed: 1 });
      expect(store.ready).toHaveLength(0);
      expect(remote.deleted).toHaveLength(0);
      await expect(stat(path.join(root, 'bad.wav'))).rejects.toThrow();
    } finally {
      await rm(root, { recursive: true, force: true });
    }
  });
});