import { prisma } from '../config/database';
import { Prisma } from '@prisma/client';
import { config } from '../config';
import { logger } from '../config/logger';
import jwt from 'jsonwebtoken';
import bcrypt from 'bcrypt';
import {
    UserResponse,
    ProfileResponse,
    ProfileUpdate,
    ProfileUpdateResponse,
    ChangePasswordRequest,
    ChangePasswordResponse
} from '../types/user.types';
import { UnauthorizedError, ValidationError, ForbiddenError } from '../middleware/errorHandler';

export class UserService {
    async getUserProfile(token: string): Promise<UserResponse> {
        try {
            // Decode JWT token to get user ID
            const decoded = jwt.verify(token, config.jwt.secret) as { id: number; username: string; email: string; roleCode: string };

            const user = await prisma.user.findUnique({
                where: {
                    id: decoded.id
                },
                include: {
                    profile: true,
                    role: true
                }
            });

            if (!user) throw new UnauthorizedError("User not found");

            return {
                id: user.id,
                username: user.username,
                email: user.email,
                updated_at: user.updated_at,
                created_at: user.created_at,
                role: {
                    code: user.role.code,
                    name: user.role.name as { th: string; en: string }
                },
                profile: user.profile ? {
                    prefix: user.profile.prefix as { th?: string; en?: string } | undefined,
                    first_name: user.profile.first_name,
                    last_name: user.profile.last_name,
                    avatar_url: user.profile.avatar_url,
                    birth_date: user.profile.birth_date,
                    phone: user.profile.phone
                } : undefined
            };
        } catch (error) {
            if (error instanceof jwt.JsonWebTokenError) {
                logger.error('Invalid JWT token:', error);
                throw new UnauthorizedError('Invalid token');
            }
            if (error instanceof jwt.TokenExpiredError) {
                logger.error('JWT token expired:', error);
                throw new UnauthorizedError('Token expired');
            }
            logger.error('Error fetching user profile:', error);
            throw error;
        }
    };

    /**
     * Change user password
     */
    async changePassword(token: string, oldPassword: string, newPassword: string): Promise<ChangePasswordResponse> {
        try {
            // Decode JWT token to get user ID
            const decoded = jwt.verify(token, config.jwt.secret) as { id: number; username: string; email: string; roleCode: string };

            const user = await prisma.user.findUnique({ where: { id: decoded.id } });
            if (!user) throw new UnauthorizedError('User not found');

            // Verify old password
            const isPasswordValid = await bcrypt.compare(oldPassword, user.password);
            if (!isPasswordValid) throw new UnauthorizedError('Invalid old password');

            // Hash new password
            const encryptedPassword = await bcrypt.hash(newPassword, 10);

            // Update password
            await prisma.user.update({
                where: { id: user.id },
                data: { password: encryptedPassword }
            });

            logger.info('Password changed successfully', { userId: user.id });
            return {
                code: 200,
                message: 'Password changed successfully'
            };
        } catch (error) {
            if (error instanceof jwt.JsonWebTokenError) {
                logger.error('Invalid JWT token:', error);
                throw new UnauthorizedError('Invalid token');
            }
            if (error instanceof jwt.TokenExpiredError) {
                logger.error('JWT token expired:', error);
                throw new UnauthorizedError('Token expired');
            }
            logger.error('Failed to change password', { error });
            throw error;
        }
    }

    /**
         * Format user response
         */
    private formatUserResponse(user: any): UserResponse {
        return {
            id: user.id,
            username: user.username,
            email: user.email,
            updated_at: user.updated_at,
            created_at: user.created_at,
            role: {
                code: user.role.code,
                name: user.role.name
            },
            profile: user.profile ? {
                prefix: user.profile.prefix,
                first_name: user.profile.first_name,
                last_name: user.profile.last_name,
                avatar_url: user.profile.avatar_url,
                phone: user.profile.phone,
                birth_date: user.profile.birth_date
            } : undefined
        };
    }
}