import axios from 'axios';

export class RocketChatService {
  private apiUrl: string;
  private authToken: string;
  private userId: string;

  constructor() {
    // Extract the base URL from the iframe URL
    const baseUrl = process.env.NEXT_PUBLIC_IFRAME_PAROLE_URL?.split('/channel')[0] || '';
    this.apiUrl = baseUrl;
    this.authToken = process.env.ROCKET_CHAT_TOKEN || '';
    this.userId = process.env.ROCKET_CHAT_USER_ID || '';
  }

  /**
   * Create a new channel in Rocket.Chat
   * @param mission The mission data
   * @returns Channel ID or throws error
   */
  async createChannel(mission: any): Promise<string> {
    try {
      // First, get all mission users that need to be added to the channel
      const missionUserEmails = mission.missionUsers.map((mu: any) => mu.user.email);
      const rocketChatUsernames: string[] = [];
      
      for (const email of missionUserEmails) {
        const user = await this.getUserByEmail(email);
        if (user) {
          rocketChatUsernames.push(user.username);
        } else {
          console.warn(`User not found in Rocket.Chat: ${email}`);
        }
      }
      
      // Sanitize the channel name to comply with Rocket.Chat restrictions
      const channelName = this.sanitizeChannelName(mission.name);
      
      // Create the channel
      const response = await axios.post(
        `${this.apiUrl}/api/v1/channels.create`,
        {
          name: channelName,
          members: rocketChatUsernames,
          readOnly: false
        },
        {
          headers: {
            'Content-Type': 'application/json',
            'X-Auth-Token': this.authToken,
            'X-User-Id': this.userId
          }
        }
      );

      if (!response.data || !response.data.success) {
        throw new Error(`Failed to create Rocket.Chat channel: ${JSON.stringify(response.data)}`);
      }

      const channelId = response.data.channel._id;
      console.log(`Created Rocket.Chat channel with ID: ${channelId}`);

      // Make "Gardien de la Parole" users channel admins
      await this.setChannelAdmins(channelId, mission.missionUsers);

      return channelId;
    } catch (error) {
      console.error('Error creating Rocket.Chat channel:', error);
      throw new Error(`Rocket.Chat integration failed: ${error instanceof Error ? error.message : String(error)}`);
    }
  }

  /**
   * Make "Gardien de la Parole" users channel admins
   * @param channelId The Rocket.Chat channel ID
   * @param missionUsers The mission users with roles
   */
  async setChannelAdmins(channelId: string, missionUsers: any[]): Promise<void> {
    try {
      // Find "Gardien de la Parole" users
      const gardienParoleUsers = missionUsers.filter((mu: any) => mu.role === 'gardien-parole');

      for (const gardienUser of gardienParoleUsers) {
        const user = await this.getUserByEmail(gardienUser.user.email);
        if (user) {
          await this.makeUserChannelOwner(channelId, user._id);
        }
      }
    } catch (error) {
      console.error('Error setting channel admins:', error);
      // Don't fail if setting admins fails
    }
  }

  /**
   * Make a user a channel owner
   * @param channelId The Rocket.Chat channel ID
   * @param userId The Rocket.Chat user ID
   */
  async makeUserChannelOwner(channelId: string, userId: string): Promise<void> {
    try {
      const response = await axios.post(
        `${this.apiUrl}/api/v1/channels.addOwner`,
        {
          roomId: channelId,
          userId: userId
        },
        {
          headers: {
            'Content-Type': 'application/json',
            'X-Auth-Token': this.authToken,
            'X-User-Id': this.userId
          }
        }
      );

      if (!response.data || !response.data.success) {
        throw new Error(`Failed to make user channel owner: ${JSON.stringify(response.data)}`);
      }

      console.log(`Made user ${userId} an owner of channel ${channelId}`);
    } catch (error) {
      console.error(`Error making user ${userId} channel owner:`, error);
      // Don't fail if individual user assignment fails
    }
  }

  /**
   * Get a user by email
   * @param email The user email to search for
   * @returns The user object or null if not found
   */
  async getUserByEmail(email: string): Promise<any | null> {
    try {
      // First try exact email match
      const response = await axios.get(
        `${this.apiUrl}/api/v1/users.list`,
        {
          headers: {
            'X-Auth-Token': this.authToken,
            'X-User-Id': this.userId
          }
        }
      );

      if (!response.data || !response.data.success) {
        throw new Error(`Failed to get users: ${JSON.stringify(response.data)}`);
      }

      // First check if user exists by email
      const userByEmail = response.data.users.find((user: any) => 
        user.emails?.some((e: any) => e.address === email)
      );

      if (userByEmail) {
        return userByEmail;
      }

      // If not found by email, try by username (username might be the part before @)
      const username = email.split('@')[0];
      const userByUsername = response.data.users.find((user: any) => user.username === username);

      return userByUsername || null;
    } catch (error) {
      console.error('Error getting user by email:', error);
      return null;
    }
  }

  /**
   * Sanitize a channel name to comply with Rocket.Chat restrictions
   * @param name The original name
   * @returns The sanitized name
   */
  private sanitizeChannelName(name: string): string {
    // Replace spaces and invalid characters with hyphens
    // Channel names must match regex [0-9a-zA-Z-_.]+
    let sanitized = name.replace(/[^0-9a-zA-Z-_.]/g, '-');
    
    // Ensure no sequential hyphens
    sanitized = sanitized.replace(/-+/g, '-');
    
    // Trim hyphens from beginning and end
    sanitized = sanitized.replace(/^-+|-+$/g, '');
    
    // Ensure name is not empty after sanitization
    if (!sanitized) {
      sanitized = 'mission-channel';
    }
    
    return sanitized.toLowerCase();
  }

  /**
   * Delete a channel from Rocket.Chat
   * @param channelId The Rocket.Chat channel ID to delete
   * @returns True if successful, false otherwise
   */
  async deleteChannel(channelId: string): Promise<boolean> {
    try {
      const response = await axios.post(
        `${this.apiUrl}/api/v1/channels.delete`,
        {
          roomId: channelId
        },
        {
          headers: {
            'Content-Type': 'application/json',
            'X-Auth-Token': this.authToken,
            'X-User-Id': this.userId
          }
        }
      );

      return response.data && response.data.success === true;
    } catch (error) {
      console.error(`Error deleting Rocket.Chat channel ${channelId}:`, error);
      return false;
    }
  }
}