import { Authentication } from "./Authentication";

// Log interface
interface LogData {
  user_id: string;
  type: string;  // Standard types: "error", "update", "delete", "create", "login", "logout"
  part: string;  // The specific part/section being logged (can be multiple words, e.g., "profile settings", "resume upload")
  message: string;
}

export class SendLog {
  private auth: Authentication;
  private static instance: SendLog;
  private readonly COLLECTION_NAME = "logs"; // Make collection name a constant

  private constructor() {
    this.auth = Authentication.getInstance();
  }

  /**
   * Get the singleton instance of SendLog
   */
  public static getInstance(): SendLog {
    if (!SendLog.instance) {
      SendLog.instance = new SendLog();
    }
    return SendLog.instance;
  }

  /**
   * Gets the current authenticated user's ID
   * @returns The user ID or null if not authenticated
   */
  private getCurrentUserId(): string | null {
    const user = this.auth.getCurrentUser();
    if (!user) {
      console.debug("SendLog: No current user found");
      return null;
    }
    console.debug("SendLog: Current user ID:", user.id);
    return user.id;
  }

  /**
   * Sends a log entry to PocketBase
   * @param type The type of log entry
   * @param part The specific part/section being logged
   * @param message The log message
   * @param overrideUserId Optional user ID to override the current user
   * @returns Promise that resolves when the log is created
   */
  public async send(type: string, part: string, message: string, overrideUserId?: string): Promise<void> {
    try {
      // Check authentication first
      if (!this.auth.isAuthenticated()) {
        console.error("SendLog: User not authenticated");
        throw new Error("User must be authenticated to create logs");
      }

      // Get user ID
      const userId = overrideUserId || this.getCurrentUserId();
      if (!userId) {
        console.error("SendLog: No user ID available");
        throw new Error("No user ID available. User must be authenticated to create logs.");
      }

      // Prepare log data
      const logData: LogData = {
        user_id: userId,
        type,
        part,
        message
      };

      console.debug("SendLog: Preparing to send log:", {
        collection: this.COLLECTION_NAME,
        data: logData,
        authValid: this.auth.isAuthenticated(),
        userId
      });

      // Get PocketBase instance
      const pb = this.auth.getPocketBase();
      
      // Create the log entry
      await pb.collection(this.COLLECTION_NAME).create(logData);
      
      console.debug("SendLog: Log created successfully");
    } catch (error) {
      // Enhanced error logging
      if (error instanceof Error) {
        console.error("SendLog: Failed to send log:", {
          error: error.message,
          stack: error.stack,
          type,
          part,
          message
        });
      } else {
        console.error("SendLog: Unknown error:", error);
      }
      throw error;
    }
  }

  /**
   * Get logs for a specific user
   * @param userId The ID of the user to get logs for
   * @param type Optional log type to filter by
   * @param part Optional part/section to filter by
   * @returns Array of log entries
   */
  public async getUserLogs(userId: string, type?: string, part?: string): Promise<LogData[]> {
    if (!this.auth.isAuthenticated()) {
      throw new Error("User must be authenticated to retrieve logs");
    }

    try {
      let filter = `user_id = "${userId}"`;
      if (type) filter += ` && type = "${type}"`;
      if (part) filter += ` && part = "${part}"`;

      const result = await this.auth.getPocketBase().collection(this.COLLECTION_NAME).getFullList<LogData>({
        filter,
        sort: "-created"
      });

      return result;
    } catch (error) {
      console.error("SendLog: Failed to get user logs:", error);
      throw error;
    }
  }

  /**
   * Get recent logs for the current user
   * @param limit Maximum number of logs to retrieve
   * @param type Optional log type to filter by
   * @param part Optional part/section to filter by
   * @returns Array of recent log entries
   */
  public async getRecentLogs(limit: number = 10, type?: string, part?: string): Promise<LogData[]> {
    if (!this.auth.isAuthenticated()) {
      throw new Error("User must be authenticated to retrieve logs");
    }

    try {
      const userId = this.getCurrentUserId();
      if (!userId) {
        throw new Error("No user ID available");
      }

      let filter = `user_id = "${userId}"`;
      if (type) filter += ` && type = "${type}"`;
      if (part) filter += ` && part = "${part}"`;

      const result = await this.auth.getPocketBase().collection(this.COLLECTION_NAME).getList<LogData>(1, limit, {
        filter,
        sort: "-created"
      });

      return result.items;
    } catch (error) {
      console.error("SendLog: Failed to get recent logs:", error);
      throw error;
    }
  }
}