import { createClient, WebDAVClient, FileStat } from 'webdav';
import { createReadStream, createWriteStream, statSync } from 'fs';
import { Readable } from 'stream';
import { configOperations } from '../db/database';

let webdavClient: WebDAVClient | null = null;

export interface WebDAVConfig {
  url: string;
  username: string;
  password: string;
  path: string;
}

/**
 * Get WebDAV configuration from database
 */
function getWebDAVConfig(): WebDAVConfig | null {
  const config = configOperations.getAll();

  if (config.webdavEnabled !== 'true') {
    return null;
  }

  if (!config.webdavUrl || !config.webdavUsername || !config.webdavPassword) {
    return null;
  }

  return {
    url: config.webdavUrl,
    username: config.webdavUsername,
    password: config.webdavPassword,
    path: config.webdavPath || '/vidrip/'
  };
}

/**
 * Create authenticated WebDAV client from config
 */
export function createWebDAVClient(config?: WebDAVConfig): WebDAVClient | null {
  const webdavConfig = config || getWebDAVConfig();

  if (!webdavConfig) {
    return null;
  }

  try {
    return createClient(webdavConfig.url, {
      username: webdavConfig.username,
      password: webdavConfig.password
    });
  } catch (error) {
    console.error('Failed to create WebDAV client:', error);
    return null;
  }
}

/**
 * Test WebDAV connection and permissions
 */
export async function testConnection(config: WebDAVConfig): Promise<{ success: boolean; message: string }> {
  try {
    const client = createWebDAVClient(config);

    if (!client) {
      return { success: false, message: 'Failed to create WebDAV client' };
    }

    // Ensure path ends with /
    const basePath = config.path.endsWith('/') ? config.path : `${config.path}/`;

    // Test connection by checking if base path exists
    const exists = await client.exists(basePath);

    if (!exists) {
      // Try to create the directory
      try {
        await client.createDirectory(basePath, { recursive: true });
        return { success: true, message: 'Connected successfully and created directory' };
      } catch (createError) {
        return { success: false, message: `Directory doesn't exist and cannot be created: ${createError}` };
      }
    }

    // Try to get directory contents to verify read permissions
    await client.getDirectoryContents(basePath);

    return { success: true, message: 'Connected successfully' };
  } catch (error) {
    console.error('WebDAV connection test failed:', error);
    return {
      success: false,
      message: error instanceof Error ? error.message : 'Connection failed'
    };
  }
}

/**
 * Get full WebDAV path for a video
 */
function getVideoPath(videoId: string): string {
  const config = getWebDAVConfig();
  if (!config) {
    throw new Error('WebDAV not configured');
  }

  const basePath = config.path.endsWith('/') ? config.path : `${config.path}/`;
  return `${basePath}${videoId}.mp4`;
}

/**
 * Upload video file to WebDAV
 */
export async function uploadVideo(localPath: string, videoId: string): Promise<void> {
  const config = getWebDAVConfig();

  if (!config) {
    throw new Error('WebDAV not configured');
  }

  const client = createWebDAVClient(config);

  if (!client) {
    throw new Error('Failed to create WebDAV client');
  }

  try {
    const remotePath = getVideoPath(videoId);
    const basePath = config.path.endsWith('/') ? config.path : `${config.path}/`;

    // Ensure directory exists
    const dirExists = await client.exists(basePath);
    if (!dirExists) {
      await client.createDirectory(basePath, { recursive: true });
    }

    // Upload file
    const fileStream = createReadStream(localPath);
    await client.putFileContents(remotePath, fileStream, {
      overwrite: true
    });

    console.log(`Successfully uploaded ${videoId}.mp4 to WebDAV`);
  } catch (error) {
    console.error('Failed to upload to WebDAV:', error);
    throw new Error(`WebDAV upload failed: ${error instanceof Error ? error.message : 'Unknown error'}`);
  }
}

/**
 * Delete video from WebDAV server
 */
export async function deleteVideo(videoId: string): Promise<void> {
  const config = getWebDAVConfig();

  if (!config) {
    // If WebDAV not configured, silently return (nothing to delete)
    return;
  }

  const client = createWebDAVClient(config);

  if (!client) {
    throw new Error('Failed to create WebDAV client');
  }

  try {
    const remotePath = getVideoPath(videoId);

    const exists = await client.exists(remotePath);
    if (exists) {
      await client.deleteFile(remotePath);
      console.log(`Successfully deleted ${videoId}.mp4 from WebDAV`);
    }
  } catch (error) {
    console.error('Failed to delete from WebDAV:', error);
    throw new Error(`WebDAV delete failed: ${error instanceof Error ? error.message : 'Unknown error'}`);
  }
}

/**
 * Get readable stream from WebDAV for proxying
 */
export async function streamVideo(videoId: string): Promise<Readable> {
  const config = getWebDAVConfig();

  if (!config) {
    throw new Error('WebDAV not configured');
  }

  const client = createWebDAVClient(config);

  if (!client) {
    throw new Error('Failed to create WebDAV client');
  }

  try {
    const remotePath = getVideoPath(videoId);

    const stream = client.createReadStream(remotePath);
    return stream as Readable;
  } catch (error) {
    console.error('Failed to stream from WebDAV:', error);
    throw new Error(`WebDAV stream failed: ${error instanceof Error ? error.message : 'Unknown error'}`);
  }
}

/**
 * Check if video exists on WebDAV
 */
export async function getVideoExists(videoId: string): Promise<boolean> {
  const config = getWebDAVConfig();

  if (!config) {
    return false;
  }

  const client = createWebDAVClient(config);

  if (!client) {
    return false;
  }

  try {
    const remotePath = getVideoPath(videoId);
    return await client.exists(remotePath);
  } catch (error) {
    console.error('Failed to check video existence on WebDAV:', error);
    return false;
  }
}

/**
 * Get video file stats from WebDAV
 */
export async function getVideoStats(videoId: string): Promise<FileStat | null> {
  const config = getWebDAVConfig();

  if (!config) {
    return null;
  }

  const client = createWebDAVClient(config);

  if (!client) {
    return null;
  }

  try {
    const remotePath = getVideoPath(videoId);
    const stat = await client.stat(remotePath) as FileStat;
    return stat;
  } catch (error) {
    console.error('Failed to get video stats from WebDAV:', error);
    return null;
  }
}

/**
 * Check if WebDAV is enabled and configured
 */
export function isWebDAVEnabled(): boolean {
  const config = getWebDAVConfig();
  return config !== null;
}