import { Body, Controller, Delete, Get, Param, Post, Put, Res } from '@nestjs/common';
import { UserService } from './user.service';
import { Response } from 'express';
import { GenericResponse } from '../common/GenericResponse.model';
import { User } from './user.entity';
import { ApiTags, ApiOperation, ApiResponse, ApiParam, ApiBody } from '@nestjs/swagger';

@ApiTags('users')
@Controller('users')
export class UserController {
    constructor(private userService: UserService) {}

    @Get("/all")
    @ApiOperation({ summary: 'Get all users' })
    @ApiResponse({
        status: 200,
        description: 'Successfully retrieved all users',
    })
    @ApiResponse({
        status: 404,
        description: 'No users found',
        example: {
            "notification": {
                "exception": true,
                "exceptionSeverity": "HIGH",
                "exceptionMessage": "ERR.NOT_FOUND",
                "stackTrace": "No users found"
            },
            "data": null
        }
    })
    async getAllUsers(@Res() res: Response) {
        const response = await this.userService.findAll();
        if (!response) {
            const errorResponse = new GenericResponse({
                exception: true,
                exceptionSeverity: 'HIGH',
                exceptionMessage: 'ERR.NOT_FOUND',
                stackTrace: 'No users found'
            }, null);
            return res.status(404).send(errorResponse);
        }
        const httpResponse = new GenericResponse(null, response);
        res.status(200).send(httpResponse);
    }

    @Get(':id')
    @ApiOperation({ summary: 'Get a user by ID' })
    @ApiParam({ name: 'id', type: Number, description: 'User ID' })
    @ApiResponse({
        status: 400,
        description: 'ID parameter is missing',
        example: {
            "notification": {
                "exception": true,
                "exceptionSeverity": "HIGH",
                "exceptionMessage": "ERR.NO_ID_REQ",
                "stackTrace": "Request"
            },
            "data": null
        }
    })
    @ApiResponse({
        status: 404,
        description: 'User not found',
        example: {
            "notification": {
                "exception": true,
                "exceptionSeverity": "HIGH",
                "exceptionMessage": "ERR.NOT_FOUND",
                "stackTrace": "User not found"
            },
            "data": null
        }
    })
    @ApiResponse({
        status: 200,
        description: 'Successfully retrieved user by ID',
    })
    async findById(@Param('id') id: number, @Res() res: Response) {
        if (!id) {
            const response = new GenericResponse({
                exception: true,
                exceptionSeverity: 'HIGH',
                exceptionMessage: 'ERR.NO_ID_REQ',
                stackTrace: 'Request'
            }, null);
            return res.status(400).send(response);
        }
        const response = await this.userService.findByPk(id);
        if (!response) {
            const errorResponse = new GenericResponse({
                exception: true,
                exceptionSeverity: 'HIGH',
                exceptionMessage: 'ERR.NOT_FOUND',
                stackTrace: `User with ID ${id} not found`
            }, null);
            return res.status(404).send(errorResponse);
        }
        const httpResponse = new GenericResponse(null, response);
        res.status(200).send(httpResponse);
    }

    @Post('/filter')
    @ApiOperation({ summary: 'Filter users based on criteria' })
    @ApiBody({ type: User, description: 'User filter criteria' })
    @ApiResponse({
        status: 400,
        description: 'Failed to insert user',
        example: {
            "notification": {
                "exception": true,
                "exceptionSeverity": "HIGH",
                "exceptionMessage": "ERR.NOT_CREATED",
                "stackTrace": "Request"
            },
            "data": null
        }
    })
    @ApiResponse({
        status: 404,
        description: 'No users matching criteria found',
        example: {
            "notification": {
                "exception": true,
                "exceptionSeverity": "HIGH",
                "exceptionMessage": "ERR.NOT_FOUND",
                "stackTrace": "No users found matching criteria"
            },
            "data": null
        }
    })
    @ApiResponse({
        status: 200,
        description: 'Successfully filtered users',
    })
    async filter(@Body() user: User, @Res() res: Response) {
        if (!user) {
            const response = new GenericResponse({
                exception: true,
                exceptionSeverity: 'HIGH',
                exceptionMessage: 'ERR.NO_REQ',
                stackTrace: 'Request'
            }, null);
            return res.status(400).send(response);
        }
        const response = await this.userService.filter(user);
        if (!response) {
            const errorResponse = new GenericResponse({
                exception: true,
                exceptionSeverity: 'HIGH',
                exceptionMessage: 'ERR.NOT_FOUND',
                stackTrace: 'No users found matching criteria'
            }, null);
            return res.status(404).send(errorResponse);
        }
        const httpResponse = new GenericResponse(null, response);
        res.status(200).send(httpResponse);
    }

    @Post()
    @ApiOperation({ summary: 'Insert a new user' })
    @ApiBody({ type: User, description: 'User data to insert' })
    @ApiResponse({
        status: 400,
        description: 'Failed to insert user',
        example: {
            "notification": {
                "exception": true,
                "exceptionSeverity": "HIGH",
                "exceptionMessage": "ERR.NOT_CREATED",
                "stackTrace": "User not created"
            },
            "data": null
        }
    })
    
    @ApiResponse({
        status: 201,
        description: 'User successfully created',
    })
    async insert(@Body() user: User, @Res() res: Response) {
        if (!user) {
            const response = new GenericResponse({
                exception: true,
                exceptionSeverity: 'HIGH',
                exceptionMessage: 'ERR.NO_REQ',
                stackTrace: 'Request'
            }, null);
            return res.status(400).send(response);
        }
        delete user.id;
        if (user.password) {
            user.password = this.encryptPassword(user.password);
        }
        const response = await this.userService.upsert(user, true);
        if (!response) {
            const errorResponse = new GenericResponse({
                exception: true,
                exceptionSeverity: 'HIGH',
                exceptionMessage: 'ERR.NOT_CREATED',
                stackTrace: 'User not created'
            }, null);
            return res.status(404).send(errorResponse);
        }
        const httpResponse = new GenericResponse(null, response);
        res.status(201).send(httpResponse);
    }

    @Put()
    @ApiOperation({ summary: 'Update an existing user' })
    @ApiBody({ type: User, description: 'User data to update' })
    @ApiResponse({
        status: 400,
        description: 'Failed to update user',
        example: {
            "notification": {
                "exception": true,
                "exceptionSeverity": "HIGH",
                "exceptionMessage": "ERR.NOT_UPDATED",
                "stackTrace": "User not updated"
            },
            "data": null
        }
    })
    @ApiResponse({
        status: 404,
        description: 'User not found',
        example: {
            "notification": {
                "exception": true,
                "exceptionSeverity": "HIGH",
                "exceptionMessage": "ERR.NOT_FOUND",
                "stackTrace": "User not found"
            },
            "data": null
        }
    })
    @ApiResponse({
        status: 200,
        description: 'User successfully updated',
    })
    async update(@Body() user: User, @Res() res: Response) {
        if (!user || !user.id) {
            const response = new GenericResponse({
                exception: true,
                exceptionSeverity: 'HIGH',
                exceptionMessage: 'ERR.NO_ID_REQ',
                stackTrace: 'Request'
            }, null);
            return res.status(400).send(response);
        }
        if (user.password) {
            user.password = this.encryptPassword(user.password);
        }
        const response = await this.userService.upsert(user, false);
        if (!response) {
            const errorResponse = new GenericResponse({
                exception: true,
                exceptionSeverity: 'HIGH',
                exceptionMessage: 'ERR.NOT_FOUND',
                stackTrace: 'User not found'
            }, null);
            return res.status(404).send(errorResponse);
        }
        const httpResponse = new GenericResponse(null, response);
        res.status(200).send(httpResponse);
    }

    @Delete(':id')
    @ApiOperation({ summary: 'Delete a user by ID' })
    @ApiParam({ name: 'id', type: Number, description: 'User ID to delete' })
    @ApiResponse({
        status: 400,
        description: 'ID parameter is missing',
        example: {
            "notification": {
                "exception": true,
                "exceptionSeverity": "HIGH",
                "exceptionMessage": "ERR.NO_ID_REQ",
                "stackTrace": "Request"
            },
            "data": null
        }
    })
    @ApiResponse({
        status: 404,
        description: 'User not found',
        example: {
            "notification": {
                "exception": true,
                "exceptionSeverity": "HIGH",
                "exceptionMessage": "ERR.NOT_FOUND",
                "stackTrace": "User not found"
            },
            "data": null
        }
    })
    @ApiResponse({
        status: 200,
        description: 'User successfully deleted',
    })
    async deleteById(@Param('id') id: number, @Res() res: Response) {
        if (!id) {
            const response = new GenericResponse({
                exception: true,
                exceptionSeverity: 'HIGH',
                exceptionMessage: 'ERR.NO_ID_REQ',
                stackTrace: 'Request'
            }, null);
            return res.status(400).send(response);
        }
        const response = await this.userService.remove(id);
        if (!response) {
            const errorResponse = new GenericResponse({
                exception: true,
                exceptionSeverity: 'HIGH',
                exceptionMessage: 'ERR.NOT_FOUND',
                stackTrace: `User with ID ${id} not found`
            }, null);
            return res.status(404).send(errorResponse);
        }
        const httpResponse = new GenericResponse(null, response);
        res.status(200).send(httpResponse);
    }

    encryptPassword(password: string) {
        return Buffer.from(password).toString('base64');
    }
}