/**
 * AssetAssignment Controller
 * Mecánicas Diesel - ERP Suite
 *
 * REST API endpoints for asset assignments.
 * Module: MMD-013 Asset Management
 */

import { Router, Request, Response, NextFunction } from 'express';
import { DataSource } from 'typeorm';
import { AssetAssignmentService, AssignmentFilters } from '../services/asset-assignment.service';
import { AssignmentStatus } from '../entities/asset-assignment.entity';
import { AssigneeType } from '../entities/asset.entity';

interface TenantRequest extends Request {
  tenantId?: string;
  userId?: string;
}

export function createAssetAssignmentController(dataSource: DataSource): Router {
  const router = Router();
  const service = new AssetAssignmentService(dataSource);

  const extractTenant = (req: TenantRequest, res: Response, next: NextFunction) => {
    const tenantId = req.headers['x-tenant-id'] as string;
    if (!tenantId) {
      return res.status(400).json({ error: 'Tenant ID is required' });
    }
    req.tenantId = tenantId;
    req.userId = req.headers['x-user-id'] as string;
    next();
  };

  router.use(extractTenant);

  /**
   * Assign an asset
   * POST /api/assets/assignments
   */
  router.post('/', async (req: TenantRequest, res: Response) => {
    try {
      const assignment = await service.assign(req.tenantId!, {
        ...req.body,
        assignedBy: req.userId || req.body.assignedBy,
      });
      res.status(201).json(assignment);
    } catch (error) {
      res.status(400).json({ error: (error as Error).message });
    }
  });

  /**
   * List assignments with filters
   * GET /api/assets/assignments
   */
  router.get('/', async (req: TenantRequest, res: Response) => {
    try {
      const filters: AssignmentFilters = {
        assetId: req.query.assetId as string,
        assigneeId: req.query.assigneeId as string,
        assigneeType: req.query.assigneeType as AssigneeType,
        status: req.query.status as AssignmentStatus,
        incidentId: req.query.incidentId as string,
        startDate: req.query.startDate ? new Date(req.query.startDate as string) : undefined,
        endDate: req.query.endDate ? new Date(req.query.endDate as string) : undefined,
      };

      const pagination = {
        page: parseInt(req.query.page as string, 10) || 1,
        limit: Math.min(parseInt(req.query.limit as string, 10) || 20, 100),
      };

      const result = await service.findAll(req.tenantId!, filters, pagination);
      res.json(result);
    } catch (error) {
      res.status(500).json({ error: (error as Error).message });
    }
  });

  /**
   * Get overdue assignments
   * GET /api/assets/assignments/overdue
   */
  router.get('/overdue', async (req: TenantRequest, res: Response) => {
    try {
      const assignments = await service.findOverdue(req.tenantId!);
      res.json(assignments);
    } catch (error) {
      res.status(500).json({ error: (error as Error).message });
    }
  });

  /**
   * Validate required assets for assignee
   * POST /api/assets/assignments/validate
   */
  router.post('/validate', async (req: TenantRequest, res: Response) => {
    try {
      const { requiredCategoryIds, assigneeId, assigneeType } = req.body;
      const result = await service.validateRequiredAssets(
        req.tenantId!,
        requiredCategoryIds,
        assigneeId,
        assigneeType
      );
      res.json(result);
    } catch (error) {
      res.status(400).json({ error: (error as Error).message });
    }
  });

  /**
   * Get assignment history for an asset
   * GET /api/assets/assignments/asset/:assetId/history
   */
  router.get('/asset/:assetId/history', async (req: TenantRequest, res: Response) => {
    try {
      const history = await service.getAssetHistory(req.tenantId!, req.params.assetId);
      res.json(history);
    } catch (error) {
      res.status(500).json({ error: (error as Error).message });
    }
  });

  /**
   * Get assignment history for an assignee
   * GET /api/assets/assignments/assignee/:assigneeId/history
   */
  router.get('/assignee/:assigneeId/history', async (req: TenantRequest, res: Response) => {
    try {
      const assigneeType = req.query.type as AssigneeType || AssigneeType.EMPLOYEE;
      const history = await service.getAssigneeHistory(req.tenantId!, req.params.assigneeId, assigneeType);
      res.json(history);
    } catch (error) {
      res.status(500).json({ error: (error as Error).message });
    }
  });

  /**
   * Get assignment by ID
   * GET /api/assets/assignments/:id
   */
  router.get('/:id', async (req: TenantRequest, res: Response) => {
    try {
      const assignment = await service.findById(req.tenantId!, req.params.id);
      if (!assignment) {
        return res.status(404).json({ error: 'Assignment not found' });
      }
      res.json(assignment);
    } catch (error) {
      res.status(500).json({ error: (error as Error).message });
    }
  });

  /**
   * Return an assigned asset
   * POST /api/assets/assignments/:id/return
   */
  router.post('/:id/return', async (req: TenantRequest, res: Response) => {
    try {
      const assignment = await service.return(req.tenantId!, req.params.id, {
        ...req.body,
        returnedTo: req.userId || req.body.returnedTo,
      });
      res.json(assignment);
    } catch (error) {
      res.status(400).json({ error: (error as Error).message });
    }
  });

  /**
   * Transfer an assignment
   * POST /api/assets/assignments/:id/transfer
   */
  router.post('/:id/transfer', async (req: TenantRequest, res: Response) => {
    try {
      const assignment = await service.transfer(req.tenantId!, req.params.id, {
        ...req.body,
        transferredBy: req.userId || req.body.transferredBy,
      });
      res.json(assignment);
    } catch (error) {
      res.status(400).json({ error: (error as Error).message });
    }
  });

  return router;
}