/**
 * Combat API Controller
 * Handles all combat-related HTTP requests including combat initiation, status, and history
 */

const CombatService = require('../../services/combat/CombatService');
const { CombatPluginManager } = require('../../services/combat/CombatPluginManager');
const GameEventService = require('../../services/websocket/GameEventService');
const logger = require('../../utils/logger');
const { ValidationError, ConflictError, NotFoundError } = require('../../middleware/error.middleware');

class CombatController {
  constructor() {
    this.combatPluginManager = null;
    this.gameEventService = null;
    this.combatService = null;
  }

  /**
     * Initialize controller with dependencies
     * @param {Object} dependencies - Service dependencies
     */
  async initialize(dependencies = {}) {
    this.gameEventService = dependencies.gameEventService || new GameEventService();
    this.combatPluginManager = dependencies.combatPluginManager || new CombatPluginManager();
    this.combatService = dependencies.combatService || new CombatService(this.gameEventService, this.combatPluginManager);

    // Initialize plugin manager
    await this.combatPluginManager.initialize('controller-init');
  }

  /**
     * Initiate combat between fleets or fleet vs colony
     * POST /api/combat/initiate
     */
  async initiateCombat(req, res, next) {
    try {
      const correlationId = req.correlationId;
      const playerId = req.user.id;
      const combatData = req.body;

      logger.info('Combat initiation request', {
        correlationId,
        playerId,
        combatData,
      });

      // Validate required fields
      if (!combatData.attacker_fleet_id) {
        return res.status(400).json({
          error: 'Attacker fleet ID is required',
          code: 'MISSING_ATTACKER_FLEET',
        });
      }

      if (!combatData.location) {
        return res.status(400).json({
          error: 'Combat location is required',
          code: 'MISSING_LOCATION',
        });
      }

      if (!combatData.defender_fleet_id && !combatData.defender_colony_id) {
        return res.status(400).json({
          error: 'Either defender fleet or colony must be specified',
          code: 'MISSING_DEFENDER',
        });
      }

      // Initialize services if not already done
      if (!this.combatService) {
        await this.initialize();
      }

      // Initiate combat
      const result = await this.combatService.initiateCombat(combatData, playerId, correlationId);

      logger.info('Combat initiated successfully', {
        correlationId,
        playerId,
        battleId: result.battleId,
      });

      res.status(201).json({
        success: true,
        data: result,
        message: 'Combat initiated successfully',
      });

    } catch (error) {
      logger.error('Combat initiation failed', {
        correlationId: req.correlationId,
        playerId: req.user?.id,
        error: error.message,
        stack: error.stack,
      });

      if (error instanceof ValidationError) {
        return res.status(400).json({
          error: error.message,
          code: 'VALIDATION_ERROR',
        });
      }

      if (error instanceof ConflictError) {
        return res.status(409).json({
          error: error.message,
          code: 'CONFLICT_ERROR',
        });
      }

      if (error instanceof NotFoundError) {
        return res.status(404).json({
          error: error.message,
          code: 'NOT_FOUND',
        });
      }

      next(error);
    }
  }

  /**
     * Get active combats for the current player
     * GET /api/combat/active
     */
  async getActiveCombats(req, res, next) {
    try {
      const correlationId = req.correlationId;
      const playerId = req.user.id;

      logger.info('Active combats request', {
        correlationId,
        playerId,
      });

      if (!this.combatService) {
        await this.initialize();
      }

      const activeCombats = await this.combatService.getActiveCombats(playerId, correlationId);

      logger.info('Active combats retrieved', {
        correlationId,
        playerId,
        count: activeCombats.length,
      });

      res.json({
        success: true,
        data: {
          combats: activeCombats,
          count: activeCombats.length,
        },
      });

    } catch (error) {
      logger.error('Failed to get active combats', {
        correlationId: req.correlationId,
        playerId: req.user?.id,
        error: error.message,
        stack: error.stack,
      });

      next(error);
    }
  }

  /**
     * Get combat history for the current player
     * GET /api/combat/history
     */
  async getCombatHistory(req, res, next) {
    try {
      const correlationId = req.correlationId;
      const playerId = req.user.id;

      // Parse query parameters
      const options = {
        limit: parseInt(req.query.limit) || 20,
        offset: parseInt(req.query.offset) || 0,
        outcome: req.query.outcome || null,
      };

      // Validate parameters
      if (options.limit > 100) {
        return res.status(400).json({
          error: 'Limit cannot exceed 100',
          code: 'INVALID_LIMIT',
        });
      }

      if (options.outcome && !['attacker_victory', 'defender_victory', 'draw'].includes(options.outcome)) {
        return res.status(400).json({
          error: 'Invalid outcome filter',
          code: 'INVALID_OUTCOME',
        });
      }

      logger.info('Combat history request', {
        correlationId,
        playerId,
        options,
      });

      if (!this.combatService) {
        await this.initialize();
      }

      const history = await this.combatService.getCombatHistory(playerId, options, correlationId);

      logger.info('Combat history retrieved', {
        correlationId,
        playerId,
        count: history.combats.length,
        total: history.pagination.total,
      });

      res.json({
        success: true,
        data: history,
      });

    } catch (error) {
      logger.error('Failed to get combat history', {
        correlationId: req.correlationId,
        playerId: req.user?.id,
        error: error.message,
        stack: error.stack,
      });

      next(error);
    }
  }

  /**
     * Get detailed combat encounter information
     * GET /api/combat/encounter/:encounterId
     */
  async getCombatEncounter(req, res, next) {
    try {
      const correlationId = req.correlationId;
      const playerId = req.user.id;
      const encounterId = parseInt(req.params.encounterId);

      if (!encounterId || isNaN(encounterId)) {
        return res.status(400).json({
          error: 'Valid encounter ID is required',
          code: 'INVALID_ENCOUNTER_ID',
        });
      }

      logger.info('Combat encounter request', {
        correlationId,
        playerId,
        encounterId,
      });

      if (!this.combatService) {
        await this.initialize();
      }

      const encounter = await this.combatService.getCombatEncounter(encounterId, playerId, correlationId);

      if (!encounter) {
        return res.status(404).json({
          error: 'Combat encounter not found or access denied',
          code: 'ENCOUNTER_NOT_FOUND',
        });
      }

      logger.info('Combat encounter retrieved', {
        correlationId,
        playerId,
        encounterId,
      });

      res.json({
        success: true,
        data: encounter,
      });

    } catch (error) {
      logger.error('Failed to get combat encounter', {
        correlationId: req.correlationId,
        playerId: req.user?.id,
        encounterId: req.params.encounterId,
        error: error.message,
        stack: error.stack,
      });

      next(error);
    }
  }

  /**
     * Get combat statistics for the current player
     * GET /api/combat/statistics
     */
  async getCombatStatistics(req, res, next) {
    try {
      const correlationId = req.correlationId;
      const playerId = req.user.id;

      logger.info('Combat statistics request', {
        correlationId,
        playerId,
      });

      if (!this.combatService) {
        await this.initialize();
      }

      const statistics = await this.combatService.getCombatStatistics(playerId, correlationId);

      logger.info('Combat statistics retrieved', {
        correlationId,
        playerId,
      });

      res.json({
        success: true,
        data: statistics,
      });

    } catch (error) {
      logger.error('Failed to get combat statistics', {
        correlationId: req.correlationId,
        playerId: req.user?.id,
        error: error.message,
        stack: error.stack,
      });

      next(error);
    }
  }

  /**
     * Update fleet positioning for tactical combat
     * PUT /api/combat/position/:fleetId
     */
  async updateFleetPosition(req, res, next) {
    try {
      const correlationId = req.correlationId;
      const playerId = req.user.id;
      const fleetId = parseInt(req.params.fleetId);
      const positionData = req.body;

      if (!fleetId || isNaN(fleetId)) {
        return res.status(400).json({
          error: 'Valid fleet ID is required',
          code: 'INVALID_FLEET_ID',
        });
      }

      logger.info('Fleet position update request', {
        correlationId,
        playerId,
        fleetId,
        positionData,
      });

      if (!this.combatService) {
        await this.initialize();
      }

      const result = await this.combatService.updateFleetPosition(fleetId, positionData, playerId, correlationId);

      logger.info('Fleet position updated', {
        correlationId,
        playerId,
        fleetId,
      });

      res.json({
        success: true,
        data: result,
        message: 'Fleet position updated successfully',
      });

    } catch (error) {
      logger.error('Failed to update fleet position', {
        correlationId: req.correlationId,
        playerId: req.user?.id,
        fleetId: req.params.fleetId,
        error: error.message,
        stack: error.stack,
      });

      if (error instanceof ValidationError) {
        return res.status(400).json({
          error: error.message,
          code: 'VALIDATION_ERROR',
        });
      }

      if (error instanceof NotFoundError) {
        return res.status(404).json({
          error: error.message,
          code: 'NOT_FOUND',
        });
      }

      next(error);
    }
  }

  /**
     * Get available combat types and configurations
     * GET /api/combat/types
     */
  async getCombatTypes(req, res, next) {
    try {
      const correlationId = req.correlationId;

      logger.info('Combat types request', { correlationId });

      if (!this.combatService) {
        await this.initialize();
      }

      const combatTypes = await this.combatService.getAvailableCombatTypes(correlationId);

      logger.info('Combat types retrieved', {
        correlationId,
        count: combatTypes.length,
      });

      res.json({
        success: true,
        data: combatTypes,
      });

    } catch (error) {
      logger.error('Failed to get combat types', {
        correlationId: req.correlationId,
        error: error.message,
        stack: error.stack,
      });

      next(error);
    }
  }

  /**
     * Force resolve a combat (admin only)
     * POST /api/combat/resolve/:battleId
     */
  async forceResolveCombat(req, res, next) {
    try {
      const correlationId = req.correlationId;
      const battleId = parseInt(req.params.battleId);

      if (!battleId || isNaN(battleId)) {
        return res.status(400).json({
          error: 'Valid battle ID is required',
          code: 'INVALID_BATTLE_ID',
        });
      }

      logger.info('Force resolve combat request', {
        correlationId,
        battleId,
        adminUser: req.user?.id,
      });

      if (!this.combatService) {
        await this.initialize();
      }

      const result = await this.combatService.processCombat(battleId, correlationId);

      logger.info('Combat force resolved', {
        correlationId,
        battleId,
        outcome: result.outcome,
      });

      res.json({
        success: true,
        data: result,
        message: 'Combat resolved successfully',
      });

    } catch (error) {
      logger.error('Failed to force resolve combat', {
        correlationId: req.correlationId,
        battleId: req.params.battleId,
        error: error.message,
        stack: error.stack,
      });

      if (error instanceof NotFoundError) {
        return res.status(404).json({
          error: error.message,
          code: 'NOT_FOUND',
        });
      }

      if (error instanceof ConflictError) {
        return res.status(409).json({
          error: error.message,
          code: 'CONFLICT_ERROR',
        });
      }

      next(error);
    }
  }

  /**
     * Get combat queue status (admin only)
     * GET /api/combat/queue
     */
  async getCombatQueue(req, res, next) {
    try {
      const correlationId = req.correlationId;
      const status = req.query.status || null;
      const limit = parseInt(req.query.limit) || 50;

      logger.info('Combat queue request', {
        correlationId,
        status,
        limit,
        adminUser: req.user?.id,
      });

      if (!this.combatService) {
        await this.initialize();
      }

      const queue = await this.combatService.getCombatQueue({ status, limit }, correlationId);

      logger.info('Combat queue retrieved', {
        correlationId,
        count: queue.length,
      });

      res.json({
        success: true,
        data: queue,
      });

    } catch (error) {
      logger.error('Failed to get combat queue', {
        correlationId: req.correlationId,
        error: error.message,
        stack: error.stack,
      });

      next(error);
    }
  }
}

// Export singleton instance
const combatController = new CombatController();

module.exports = {
  CombatController,

  // Export bound methods for route usage
  initiateCombat: combatController.initiateCombat.bind(combatController),
  getActiveCombats: combatController.getActiveCombats.bind(combatController),
  getCombatHistory: combatController.getCombatHistory.bind(combatController),
  getCombatEncounter: combatController.getCombatEncounter.bind(combatController),
  getCombatStatistics: combatController.getCombatStatistics.bind(combatController),
  updateFleetPosition: combatController.updateFleetPosition.bind(combatController),
  getCombatTypes: combatController.getCombatTypes.bind(combatController),
  forceResolveCombat: combatController.forceResolveCombat.bind(combatController),
  getCombatQueue: combatController.getCombatQueue.bind(combatController),
};