import express, { Request, Response } from 'express'
import { PrismaClient } from '@prisma/client'
import fs from 'fs'
import path from 'path'
import axios from 'axios'
import multer from 'multer'
import bodyParser from 'body-parser'
import cors from 'cors'
import { Coordinate } from './interfaces/map'
import { generateTilesForZoomLevel } from './utils/tiles'
import { query, validationResult } from 'express-validator'
import { Connection, Request as TediousRequest } from 'tedious'

const tedious = new Connection({
    server: 'localhost',
    options: {
        trustServerCertificate: true,
        port: 1433,
        database: 'nGeneral'
    },
    authentication: {
        type: 'default',
        options: {
            userName: 'SA',
            password: 'oMhthmsvbYHc'
        }
    }
})

tedious.on('connect', function (err) {
    if (err) {
        console.log('Error: ', err)
    }

    console.log('Connected to General')
})

tedious.connect()

const prisma = new PrismaClient()
const app = express()
const PORT = process.env.EMS_PORT || 5000

const tileFolder = path.join(__dirname, '..', 'public', 'tile_data')
const uploadDir = path.join(__dirname, '..', 'public', 'temp')

app.use(cors())

app.use(bodyParser.json())

app.use(bodyParser.urlencoded({ extended: true }))

const storage = multer.diskStorage({
    destination: function (req, file, cb) {
        cb(null, path.join(__dirname, '..', 'public', 'temp'))
    },
    filename: function (req, file, cb) {
        cb(null, Date.now() + path.extname(file.originalname))
    }
})

const upload = multer({ storage: storage })

app.get('/nodes/all', async (req: Request, res: Response) => {
    try {
        const nodes = await prisma.nodes.findMany()

        res.json(nodes)
    } catch (error) {
        console.error('Error getting node:', error);
        res.status(500).json({ error: 'Failed to get node' });
    }
})

app.get('/nodes', query('id').isString().isUUID(), async (req: Request, res: Response) => {
    try {
        const result = validationResult(req)
        if (!result.isEmpty()) {
            return res.send({ errors: result.array() })
        }

        const { id } = req.params

        const node = await prisma.nodes.findFirst({
            where: {
                id: id
            }
        })

        res.json(node)

    } catch (error) {
        console.error('Error getting node:', error);
        res.status(500).json({ error: 'Failed to get node' });
    }
})

app.post('/nodes', async (req: Request, res: Response) => {
    try {
        const { coordinates, object_id, type } = req.body;

        // Convert the incoming array of coordinates into the shape structure
        const shape = coordinates.map((point: number[]) => ({
            object_id: object_id || null,
            x: point[0],
            y: point[1]
        }));

        console.log(shape)

        // Create a new node in the database
        const node = await prisma.nodes.create({
            data: {
                object_id: object_id || null,  // Nullable if object_id is not provided
                shape_type: type,         // You can adjust this dynamically
                shape: shape,                   // Store the shape array as Json[]
                label: 'Default'
            }
        });

        res.status(201).json(node);
    } catch (error) {
        console.error('Error creating node:', error);
        res.status(500).json({ error: 'Failed to create node' });
    }
})

app.post('/upload', upload.single('file'), async (req: Request, res: Response) => {
    const { extentMinX, extentMinY, extentMaxX, extentMaxY, blX, blY, tlX, tlY, trX, trY, brX, brY } = req.body

    const bottomLeft: Coordinate = { x: blX, y: blY }
    const topLeft: Coordinate = { x: tlX, y: tlY }
    const topRight: Coordinate = { x: trX, y: trY }
    const bottomRight: Coordinate = { x: brX, y: brY }

    if (req.file) {
        for (let z = 0; z <= 21; z++) {
            await generateTilesForZoomLevel(uploadDir, tileFolder, req.file, [extentMinX, extentMinY, extentMaxX, extentMaxY], bottomLeft, topLeft, topRight, bottomRight, z)
        }
    }

    return res.status(200)
})

const fetchTileFromAPI = async (provider: string, z: string, x: string, y: string): Promise<Buffer> => {
    const url = provider === 'google'
        ? `https://khms2.google.com/kh/v=984?x=${x}&y=${y}&z=${z}`
        : `https://core-sat.maps.yandex.net/tiles?l=sat&x=${x}&y=${y}&z=${z}&scale=1&lang=ru_RU`

    const response = await axios.get(url, { responseType: 'arraybuffer' })
    return response.data
}

app.get('/tile/:provider/:z/:x/:y', async (req: Request, res: Response) => {
    const { provider, z, x, y } = req.params

    if (!['google', 'yandex', 'custom'].includes(provider)) {
        return res.status(400).send('Invalid provider')
    }

    const tilePath = provider === 'custom' ? path.join(tileFolder, provider, z, x, `${y}.png`) : path.join(tileFolder, provider, z, x, `${y}.jpg`)

    if (fs.existsSync(tilePath)) {
        return res.sendFile(tilePath)
    } else {
        if (provider !== 'custom') {
            try {
                const tileData = await fetchTileFromAPI(provider, z, x, y)

                fs.mkdirSync(path.dirname(tilePath), { recursive: true })

                fs.writeFileSync(tilePath, tileData)

                res.contentType('image/jpeg')
                res.send(tileData)
            } catch (error) {
                console.error('Error fetching tile from API:', error)
                res.status(500).send('Error fetching tile from API')
            }
        } else {
            res.status(404).send('Tile is not generated or not provided')
        }
    }
})

function tediousQuery(query: string) {
    // Read all rows from table
    const request = new TediousRequest(
        query,
        (err, rowCount) => {
            if (err) {
                console.log(`Executing ${query}, ${rowCount} rows.`);
                console.error(err.message);
            } else {
                console.log(`Executing ${query}, ${rowCount} rows.`);
            }
        }
    );

    return new Promise((resolve, reject) => {
        const result: any = [];

        request.on("row", (columns) => {
            const entry: any = {};
            columns.forEach((column: any) => {
                entry[column.metadata.colName] = column.value;
            });
            result.push(entry);
        });

        request.on('error', error => reject(error));// some error happened, reject the promise
        request.on('requestCompleted', () => resolve(result)); // resolve the promise with the result rows.

        tedious.execSql(request);
    });
}

app.get('/general/cities/all', async (req: Request, res: Response) => {
    try {
        const { offset, limit, search, id } = req.query

        const result = await tediousQuery(
            `
            SELECT * FROM nGeneral..Cities
            ${id ? `WHERE id = '${id}'` : ''}
            ${search ? `WHERE name LIKE '%${search || ''}%'` : ''}
            ORDER BY id 
            OFFSET ${Number(offset) || 0} ROWS 
            FETCH NEXT ${Number(limit) || 10} ROWS ONLY;
            `
        )
        res.status(200).json(result)
    } catch (err) {
        res.status(500)
    }
})

app.get('/general/objects/all', async (req: Request, res: Response) => {
    try {
        const { offset, limit, city_id, id } = req.query

        const result = await tediousQuery(
            `
            SELECT * FROM nGeneral..tObjects
            ${city_id ? `WHERE id_city = ${city_id}` : ''}
            ${id ? `WHERE id = '${id}'` : ''}
            ORDER BY id 
            OFFSET ${Number(offset) || 0} ROWS
            FETCH NEXT ${Number(limit) || 10} ROWS ONLY;
            `
        )
        res.status(200).json(result)
    } catch (err) {
        res.status(500)
    }
})

app.get('/gis/images/all', async (req: Request, res: Response) => {
    try {
        const { offset, limit, city_id } = req.query

        const result = await tediousQuery(
            `
            SELECT * FROM New_Gis..images
            ${city_id ? `WHERE city_id = ${city_id}` : ''}
            ORDER BY city_id 
            OFFSET ${Number(offset) || 0} ROWS
            FETCH NEXT ${Number(limit) || 10} ROWS ONLY;
            `
        )
        res.status(200).json(result)
    } catch (err) {
        res.status(500)
    }
})


// Get figures by year and city id
app.get('/gis/figures/all', async (req: Request, res: Response) => {
    try {
        const { offset, limit, object_id, year, city_id } = req.query

        const result = await tediousQuery(
            `
            SELECT * FROM New_Gis..figures f
            JOIN nGeneral..tObjects o ON f.object_id = o.id WHERE o.id_city = ${city_id} AND f.year = ${year}
            ORDER BY f.year
            OFFSET ${Number(offset) || 0} ROWS
            FETCH NEXT ${Number(limit) || 10} ROWS ONLY;
            `
        )
        res.status(200).json(result)
    } catch (err) {
        res.status(500)
    }
})

// Get lines by year and city id
app.get('/gis/lines/all', async (req: Request, res: Response) => {
    try {
        const { offset, limit, object_id, year, city_id } = req.query

        const result = await tediousQuery(
            `
            SELECT * FROM New_Gis..lines l
            JOIN nGeneral..tObjects o ON l.object_id = o.id WHERE o.id_city = ${city_id} AND l.year = ${year}
            ORDER BY l.year
            OFFSET ${Number(offset) || 0} ROWS
            FETCH NEXT ${Number(limit) || 10} ROWS ONLY;
            `
        )
        res.status(200).json(result)
    } catch (err) {
        res.status(500)
    }
})

app.listen(PORT, () => console.log(`Server running on port ${PORT}`));