import {execFile} from "node:child_process"
import folderMap from "#server/config/backup-folders.json";

export const REMOTE_HOST = process.env.BACKUPS_REMOTE_HOST
export const REMOTE_ROOT = process.env.BACKUPS_REMOTE_ROOT || "/home/malio-b/backups"
export const FOLDER_MAP = folderMap as Record<string, string>
export const isSafeFolder = (value: string) => /^[a-zA-Z0-9._-]+$/.test(value)
export const isSafeFile = (value: string) => /^[a-zA-Z0-9._-]+$/.test(value)

export const shellQuote = (value: string) => `'${value.replace(/'/g, `'\\''`)}'`

export function runSsh(command: string): Promise<string> {
    if (!REMOTE_HOST) {
        return Promise.reject(new Error("BACKUPS_REMOTE_HOST is not configured"))
    }
    return new Promise((resolve, reject) => {
        execFile(
            "ssh",
            ["-o", "BatchMode=yes", "-o", "ConnectTimeout=5", REMOTE_HOST, command],
            {maxBuffer: 10 * 1024 * 1024},
            (error, stdout, stderr) => {
                if (error) {
                    reject(stderr || error.message)
                    return
                }
                resolve(stdout)
            }
        )
    })
}

async function remoteDirExists(remoteDir: string): Promise<boolean> {
    const output = await runSsh(`[ -d ${shellQuote(remoteDir)} ] && echo yes || echo no`)
    return output.trim() === "yes"
}

export async function resolveFolderRemoteDir(folderName: string): Promise<string | null> {
    const mapped = FOLDER_MAP[folderName]
    if (mapped) {
        return `${REMOTE_ROOT}/${mapped}`
    }

    const direct = `${REMOTE_ROOT}/${folderName}`
    if (await remoteDirExists(direct)) {
        return direct
    }

    const nested = `${REMOTE_ROOT}/bdd-recette/${folderName}`
    if (await remoteDirExists(nested)) {
        return nested
    }

    return null
}