/**
 * @ai-summary HTTP request handlers for admin station oversight
 * @ai-context Handles admin operations on global stations and user-saved stations
 */

import { FastifyRequest, FastifyReply } from 'fastify';
import { StationOversightService } from '../domain/station-oversight.service';
import { logger } from '../../../core/logging/logger';

interface StationListQuery {
  limit?: string;
  offset?: string;
  search?: string;
}

interface CreateStationBody {
  placeId: string;
  name: string;
  address: string;
  latitude: number;
  longitude: number;
  priceRegular?: number;
  pricePremium?: number;
  priceDiesel?: number;
  rating?: number;
  photoUrl?: string;
}

interface UpdateStationBody {
  name?: string;
  address?: string;
  latitude?: number;
  longitude?: number;
  priceRegular?: number;
  pricePremium?: number;
  priceDiesel?: number;
  rating?: number;
  photoUrl?: string;
}

interface StationParams {
  stationId: string;
}

interface UserStationParams {
  userId: string;
  stationId: string;
}

interface DeleteQuery {
  force?: string;
}

export class StationsController {
  constructor(private service: StationOversightService) {}

  /**
   * GET /api/admin/stations
   * List all stations globally with pagination and search
   */
  async listAllStations(
    request: FastifyRequest<{ Querystring: StationListQuery }>,
    reply: FastifyReply
  ): Promise<void> {
    try {
      const actorId = request.userContext?.userId;
      if (!actorId) {
        return reply.code(401).send({ error: 'Unauthorized' });
      }

      const limit = request.query.limit ? parseInt(request.query.limit, 10) : 100;
      const offset = request.query.offset ? parseInt(request.query.offset, 10) : 0;
      const search = request.query.search;

      const result = await this.service.listAllStations(limit, offset, search);

      return reply.code(200).send(result);
    } catch (error) {
      logger.error('Error listing stations', { error });
      return reply.code(500).send({ error: 'Failed to list stations' });
    }
  }

  /**
   * POST /api/admin/stations
   * Create a new station
   */
  async createStation(
    request: FastifyRequest<{ Body: CreateStationBody }>,
    reply: FastifyReply
  ): Promise<void> {
    try {
      const actorId = request.userContext?.userId;
      if (!actorId) {
        return reply.code(401).send({ error: 'Unauthorized' });
      }

      // Validate required fields
      const { placeId, name, address, latitude, longitude } = request.body;
      if (!placeId || !name || !address || latitude === undefined || longitude === undefined) {
        return reply.code(400).send({ error: 'Missing required fields: placeId, name, address, latitude, longitude' });
      }

      const station = await this.service.createStation(actorId, request.body);

      return reply.code(201).send(station);
    } catch (error: any) {
      logger.error('Error creating station', { error });
      if (error.message?.includes('duplicate key')) {
        return reply.code(409).send({ error: 'Station with this placeId already exists' });
      }
      return reply.code(500).send({ error: 'Failed to create station' });
    }
  }

  /**
   * PUT /api/admin/stations/:stationId
   * Update an existing station
   */
  async updateStation(
    request: FastifyRequest<{ Params: StationParams; Body: UpdateStationBody }>,
    reply: FastifyReply
  ): Promise<void> {
    try {
      const actorId = request.userContext?.userId;
      if (!actorId) {
        return reply.code(401).send({ error: 'Unauthorized' });
      }

      const { stationId } = request.params;

      // Validate at least one field to update
      if (Object.keys(request.body).length === 0) {
        return reply.code(400).send({ error: 'No fields to update' });
      }

      const station = await this.service.updateStation(actorId, stationId, request.body);

      return reply.code(200).send(station);
    } catch (error: any) {
      logger.error('Error updating station', { error });
      if (error.message === 'Station not found') {
        return reply.code(404).send({ error: 'Station not found' });
      }
      return reply.code(500).send({ error: 'Failed to update station' });
    }
  }

  /**
   * DELETE /api/admin/stations/:stationId
   * Delete a station (soft delete by default, hard delete with ?force=true)
   */
  async deleteStation(
    request: FastifyRequest<{ Params: StationParams; Querystring: DeleteQuery }>,
    reply: FastifyReply
  ): Promise<void> {
    try {
      const actorId = request.userContext?.userId;
      if (!actorId) {
        return reply.code(401).send({ error: 'Unauthorized' });
      }

      const { stationId } = request.params;
      const force = request.query.force === 'true';

      await this.service.deleteStation(actorId, stationId, force);

      return reply.code(204).send();
    } catch (error: any) {
      logger.error('Error deleting station', { error });
      if (error.message === 'Station not found') {
        return reply.code(404).send({ error: 'Station not found' });
      }
      return reply.code(500).send({ error: 'Failed to delete station' });
    }
  }

  /**
   * GET /api/admin/users/:userId/stations
   * Get user's saved stations
   */
  async getUserSavedStations(
    request: FastifyRequest<{ Params: { userId: string } }>,
    reply: FastifyReply
  ): Promise<void> {
    try {
      const actorId = request.userContext?.userId;
      if (!actorId) {
        return reply.code(401).send({ error: 'Unauthorized' });
      }

      const { userId } = request.params;

      const stations = await this.service.getUserSavedStations(userId);

      return reply.code(200).send(stations);
    } catch (error) {
      logger.error('Error getting user saved stations', { error });
      return reply.code(500).send({ error: 'Failed to get user saved stations' });
    }
  }

  /**
   * DELETE /api/admin/users/:userId/stations/:stationId
   * Remove user's saved station (soft delete by default, hard delete with ?force=true)
   */
  async removeUserSavedStation(
    request: FastifyRequest<{ Params: UserStationParams; Querystring: DeleteQuery }>,
    reply: FastifyReply
  ): Promise<void> {
    try {
      const actorId = request.userContext?.userId;
      if (!actorId) {
        return reply.code(401).send({ error: 'Unauthorized' });
      }

      const { userId, stationId } = request.params;
      const force = request.query.force === 'true';

      await this.service.removeUserSavedStation(actorId, userId, stationId, force);

      return reply.code(204).send();
    } catch (error: any) {
      logger.error('Error removing user saved station', { error });
      if (error.message?.includes('not found')) {
        return reply.code(404).send({ error: error.message });
      }
      return reply.code(500).send({ error: 'Failed to remove user saved station' });
    }
  }
}