const { TeacherDetail, UserProfile, UsersAuth } = require('../models');
const { cacheUtils } = require('../config/redis');
const teacherProfileService = require('../services/teacherProfileService');

/**
 * Teacher Controller - Quản lý giáo viên
 */
class TeacherController {
  /**
   * Get all teachers with pagination and caching
   */
  async getAllTeachers(req, res, next) {
    try {
      const { page = 1, limit = 20, status, teacher_type, school_id } = req.query;
      const offset = (page - 1) * limit;
      
      const cacheKey = `teachers:list:${page}:${limit}:${status || 'all'}:${teacher_type || 'all'}:${school_id || 'all'}`;
      
      const cached = await cacheUtils.get(cacheKey);
      if (cached) {
        return res.json({
          success: true,
          data: cached,
          cached: true,
        });
      }
      
      const where = {};
      if (status) where.status = status;
      if (teacher_type) where.teacher_type = teacher_type;
      
      // Query teachers
      const { count, rows } = await TeacherDetail.findAndCountAll({
        where,
        limit: parseInt(limit),
        offset: parseInt(offset),
        order: [['created_at', 'DESC']],
      });
      
      // Manually fetch profiles for each teacher
      const teachersWithProfiles = await Promise.all(
        rows.map(async (teacher) => {
          const profile = await UserProfile.findOne({
            where: { user_id: teacher.user_id },
            attributes: ['id', 'full_name', 'phone', 'date_of_birth', 'gender', 'address', 'school_id', 'city', 'district', 'avatar_url'],
          });
          
          // Filter by school_id if provided
          if (school_id && (!profile || profile.school_id !== school_id)) {
            return null;
          }
          
          return {
            ...teacher.toJSON(),
            profile: profile ? profile.toJSON() : null,
          };
        })
      );
      
      // Filter out nulls (teachers not matching school_id)
      const filteredTeachers = teachersWithProfiles.filter(t => t !== null);
      
      const result = {
        teachers: filteredTeachers,
        pagination: {
          total: school_id ? filteredTeachers.length : count,
          page: parseInt(page),
          limit: parseInt(limit),
          totalPages: Math.ceil((school_id ? filteredTeachers.length : count) / limit),
        },
      };
      
      await cacheUtils.set(cacheKey, result, 1800);
      
      res.json({
        success: true,
        data: result,
        cached: false,
      });
    } catch (error) {
      next(error);
    }
  }

  /**
   * Get teacher by ID with manual profile fetch
   */
  async getTeacherById(req, res, next) {
    try {
      const { id } = req.params;
      const cacheKey = `teacher:${id}`;
      
      const cached = await cacheUtils.get(cacheKey);
      if (cached) {
        return res.json({
          success: true,
          data: cached,
          cached: true,
        });
      }
      
      const teacher = await TeacherDetail.findByPk(id);
      
      if (!teacher) {
        return res.status(404).json({
          success: false,
          message: 'Teacher not found',
        });
      }
      
      // Manually fetch profile
      const profile = await UserProfile.findOne({
        where: { user_id: teacher.user_id },
      });
      
      const teacherData = {
        ...teacher.toJSON(),
        profile: profile ? profile.toJSON() : null,
      };
      
      await cacheUtils.set(cacheKey, teacherData, 3600);
      
      res.json({
        success: true,
        data: teacherData,
        cached: false,
      });
    } catch (error) {
      next(error);
    }
  }

  /**
   * Create new teacher with full profile (users_auth + user_profile + teacher_detail)
   */
  async createTeacher(req, res, next) {
    try {
      const teacherData = req.body;
      
      // Use service to create full teacher profile
      const result = await teacherProfileService.createTeacherWithProfile(teacherData);
      
      // Clear cache
      await cacheUtils.deletePattern('teachers:list:*');
      
      res.status(201).json({
        success: true,
        message: 'Teacher created successfully',
        data: {
          user_id: result.user_id,
          username: result.username,
          email: result.email,
          temporary_password: result.temporary_password, // null if user provided password
          teacher_code: result.teacher_detail.teacher_code,
          teacher_type: result.teacher_detail.teacher_type,
          profile: {
            full_name: result.profile.full_name,
            needs_update: result.profile.etc?.needs_profile_update || false,
          }
        },
      });
    } catch (error) {
      next(error);
    }
  }
  
  /**
   * Update teacher profile (cho phép user tự cập nhật)
   */
  async updateTeacherProfile(req, res, next) {
    try {
      const { id } = req.params; // user_id or teacher_id
      const profileData = req.body;
      
      // Nếu id là teacher_id, tìm user_id
      let userId = id;
      if (profileData.teacher_id) {
        const teacher = await TeacherDetail.findByPk(profileData.teacher_id);
        if (!teacher) {
          return res.status(404).json({
            success: false,
            message: 'Teacher not found',
          });
        }
        userId = teacher.user_id;
      }
      
      // Update profile
      const updatedProfile = await teacherProfileService.updateTeacherProfile(userId, profileData);
      
      // Clear cache
      await cacheUtils.delete(`teacher:${id}`);
      await cacheUtils.delete(`user:profile:${userId}`);
      await cacheUtils.deletePattern('teachers:list:*');
      
      res.json({
        success: true,
        message: 'Teacher profile updated successfully',
        data: updatedProfile,
      });
    } catch (error) {
      next(error);
    }
  }

  /**
   * Update teacher
   */
  async updateTeacher(req, res, next) {
    try {
      const { id } = req.params;
      const updates = req.body;
      
      const teacher = await TeacherDetail.findByPk(id);
      if (!teacher) {
        return res.status(404).json({
          success: false,
          message: 'Teacher not found',
        });
      }
      
      await teacher.update(updates);
      
      await cacheUtils.delete(`teacher:${id}`);
      await cacheUtils.deletePattern('teachers:list:*');
      
      res.status(200).json({
        success: true,
        message: 'Teacher updated successfully',
        data: teacher,
      });
    } catch (error) {
      next(error);
    }
  }

  /**
   * Delete teacher (update status to resigned)
   */
  async deleteTeacher(req, res, next) {
    try {
      const { id } = req.params;
      
      const teacher = await TeacherDetail.findByPk(id);
      if (!teacher) {
        return res.status(404).json({
          success: false,
          message: 'Teacher not found',
        });
      }
      
      await teacher.update({ status: 'resigned' });
      
      await cacheUtils.delete(`teacher:${id}`);
      await cacheUtils.deletePattern('teachers:list:*');
      
      res.status(200).json({
        success: true,
        message: 'Teacher status updated to resigned',
        data: teacher,
      });
    } catch (error) {
      next(error);
    }
  }
        jobId: job.id,
      });
    } catch (error) {
      next(error);
    }
  }

  /**
   * Get teacher datatypes
   */
  async getTeacherDatatypes(req, res, next) {
    try {
      const datatypes = TeacherDetail.rawAttributes;
      res.json({
        success: true,
        data: datatypes,
      });
    } catch (error) {
      next(error);
    }
  }
}

module.exports = new TeacherController();