const File = require('./fileModel')
const AppError = require('../../globalErrorHandler/AppError')
const util = require('util')
const fs = require('fs')
const {
    uploadObject,
    deleteObject,
    listOfObjects,
    signedUrl,
    copyObject,
    removeObject,
} = require('../../utils/upload/bucket')

const deleteTempFile = util.promisify(fs.unlink)

const bucketSingleUpload = async (file, bucketName) => {
    const fileData = {
        originalName: file.originalname,
        filename: file.filename,
        path: file.path,
    }

    const result = await uploadObject(fileData, bucketName)

    const data = {
        fileURL: result.fileURL,
        fileName: result.fileName,
        fileEndpoint: result.fileEndpoint,
        bucketName,
    }

    // Delete file from uploads folder
    await deleteTempFile(file.path)

    const fileRecord = await createFile(data)

    return {
        status: 'success',
        fileRecord,
    }
}

const bucketMultiUpload = async (files, bucketName) => {
    const results = []

    for (let file of files) {
        const result = await bucketSingleUpload(file, bucketName)
        results.push(result)
    }

    return results
}

const bucketDeleteFile = async (fileName, bucketName) => {
    let raw = typeof fileName === 'object' && fileName !== null
        ? (fileName.fileName || fileName.url || fileName.name || '')
        : fileName
    let exportedFileName = getLastUrlSegment(String(raw || ''))
    if (exportedFileName) {
        await deleteObject(exportedFileName, bucketName).catch((err) => {
            console.error('Error deleting object from MinIO bucket:', err)
        })
        await deleteFile(exportedFileName).catch((err) => {
            console.error('Error deleting file record from DB:', err)
        })
    }

    return { fileName: exportedFileName }
}

const getLastUrlSegment = (url) => {
    if (!url || typeof url !== 'string') {
        return ''
    }
    if (!url.includes('/')) {
        return url
    }
    const cleanUrl = url.endsWith('/') ? url.slice(0, -1) : url
    const segments = cleanUrl.split('/')
    return segments[segments.length - 1]
}

const getAllFiles = async () => {
    return File.find({}, null, null)
}

const getFile = async (fileId) => {
    const file = await File.findById(fileId, null, null)

    if (!file) {
        throw new AppError('NoFileFound', 404, {})
    }

    return file
}

const createFile = async (data) => {
    return File.create(data, null)
}

const updateFile = async (fileId, data) => {
    const file = await File.findOneAndUpdate({ _id: fileId }, data, null)

    if (!file) {
        throw AppError('NoFileFound', 404, {})
    }

    return file
}

const deleteFile = async (fileName) => {
    await File.findOneAndDelete({ fileName }, null)

    return null
}

const bucketGetFiles = async (bucketName) => {
    return listOfObjects(bucketName)
}

const parseFileAndBucket = (input, defaultBucket = 'properties') => {
    if (!input) return { fileName: '', bucketName: defaultBucket }
    const raw = typeof input === 'object' && input !== null
        ? (input.fileName || input.name || input.url || '')
        : String(input || '')

    const clean = raw.split('?')[0]
    const match = clean.match(/(?:^|\/)(properties|documents|temp|belongings|belonging-images|belonging-documents|property-images|property-documents)\/([^/]+)$/i)
    if (match) {
        let b = match[1]
        if (b === 'property-images' || b === 'belonging-images') b = 'properties'
        if (b === 'property-documents' || b === 'belonging-documents') b = 'documents'
        return { bucketName: b, fileName: decodeURIComponent(match[2]) }
    }
    const parts = clean.split('/')
    const fileName = decodeURIComponent(parts.pop() || '')
    return { bucketName: defaultBucket, fileName }
}

const getSignedUrl = async (input, defaultBucket = 'properties') => {
    if (!input) {
        return null
    }
    const { fileName, bucketName } = parseFileAndBucket(input, defaultBucket)
    if (!fileName) {
        return null
    }
    try {
        return await signedUrl(bucketName, fileName)
    } catch (err) {
        console.error(`Error generating signed URL for ${bucketName}/${fileName}:`, err.message)
        return null
    }
}

const getMultipleSignedUrls = async (fileNameArray, defaultBucket = 'properties') => {
    if (!fileNameArray || !Array.isArray(fileNameArray)) {
        return []
    }
    const results = await Promise.all(
        fileNameArray.map(async (item) => {
            const { fileName, bucketName } = parseFileAndBucket(item, defaultBucket)
            if (!fileName) return null
            const url = await getSignedUrl(item, bucketName)
            return url ? { url, fileName, bucketName } : null
        })
    )
    return results.filter(Boolean)
}

const moveFromTempToMain = async (files, targetBucket) => {
    const tempBucket = 'temp'
    if (!files || !Array.isArray(files) || files.length === 0) {
        return []
    }

    const { minioClient } = require('../../utils/upload/bucket')

    const updatedUrls = await Promise.all(
        files.map(async (item) => {
            const rawStr = typeof item === 'object' && item !== null ? (item.url || item.fileName || item.name || '') : String(item || '')
            const fileName = getLastUrlSegment(rawStr)

            if (!fileName) {
                return null
            }

            try {
                // Check if object exists in temp bucket
                const existsInTemp = await minioClient.statObject(tempBucket, fileName).then(() => true).catch(() => false)
                if (existsInTemp) {
                    // Copy object from temp to targetBucket
                    await copyObject(targetBucket, fileName, `/${tempBucket}/${fileName}`).catch((err) => {
                        console.error(`Failed to copy object "${fileName}" to "${targetBucket}":`, err.message)
                    })
                    // Remove from temp bucket
                    await removeObject(tempBucket, fileName).catch((err) => {
                        console.error(`Failed to remove object "${fileName}" from "${tempBucket}":`, err.message)
                    })
                    // Update File record in database if exists
                    await File.findOneAndUpdate({ fileName }, { bucketName: targetBucket }, null).catch(() => {})
                }

                // Construct new URL for targetBucket
                const protocol = process.env.AWS_USE_SSL === 'true' ? 'https://' : 'http://'
                const endpoint = process.env.AWS_ENDPOINT || 'localhost'
                const hostPort = (endpoint.includes(':') || !process.env.AWS_PORT) ? endpoint : `${endpoint}:${process.env.AWS_PORT}`
                const fullHost = hostPort.startsWith('http://') || hostPort.startsWith('https://') ? hostPort : `${protocol}${hostPort}`
                const newUrl = `${fullHost.replace(/\/$/, '')}/${targetBucket}/${fileName}`

                return newUrl
            } catch (err) {
                console.error(`Failed to move file "${fileName}" from ${tempBucket} to ${targetBucket}:`, err.message)
                if (rawStr.includes(`/${tempBucket}/`)) {
                    return rawStr.replace(`/${tempBucket}/`, `/${targetBucket}/`)
                }
                return rawStr
            }
        })
    )

    return updatedUrls.filter(Boolean)
}

const getImage = async (bucketName, fileName) => {
    if (!fileName) {
        throw new AppError('NoFileFound', 404, {})
    }


    // Get signed URL from the file service
    const signedUrl = await getSignedUrl(fileName, bucketName);

    if (!signedUrl) {
        return null;
    }

    // Fetch the image from the signed URL
    const response = await fetch(signedUrl);

    if (!response.ok) {
        throw new AppError('NoFileFound', 404, {})
    }

    // Get the content type from the response headers
    const contentType = response.headers.get('content-type');

    // Convert the response to a buffer
    const buffer = await response.arrayBuffer();

    // Return both the buffer and content type
    return {
        buffer: Buffer.from(buffer),
        contentType
    };
};
module.exports = {
    moveFromTempToMain,
    getMultipleSignedUrls,
    getSignedUrl,
    createFile,
    updateFile,
    deleteFile,
    getAllFiles,
    getFile,
    bucketSingleUpload,
    bucketMultiUpload,
    bucketDeleteFile,
    bucketGetFiles,
    getImage,
}