/**
 * qBittorrent Driver
 */

import type { TorrentClientDriver, TorrentInfo } from './index.js'

// Mapping état qBittorrent → état normalisé
function mapState(state: string): TorrentInfo['state'] {
    if (['downloading', 'metaDL', 'queuedDL', 'stalledDL', 'forcedDL'].includes(state)) return 'downloading'
    if (['uploading', 'queuedUP', 'stalledUP', 'forcedUP'].includes(state))              return 'seeding'
    if (['pausedDL', 'pausedUP'].includes(state))                                         return 'paused'
    if (['checkingDL', 'checkingUP', 'checkingResumeData'].includes(state))               return 'checking'
    if (state === 'error' || state === 'missingFiles')                                    return 'error'
    return 'unknown'
}

async function qbLogin(config: Record<string, string | number>): Promise<string> {
    const form = new URLSearchParams()
    form.append('username', String(config.username ?? ''))
    form.append('password', String(config.password ?? ''))

    const res = await fetch(`${config.url}/api/v2/auth/login`, {
        method : 'POST',
        body   : form,
        headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
    })

    const text = await res.text()
    if (text !== 'Ok.') throw new Error(`Login échoué : ${text}`)

    const cookie = res.headers.get('set-cookie') ?? ''
    const sid = cookie.match(/SID=([^;]+)/)?.[1]
    if (!sid) throw new Error('Cookie SID introuvable')
    return sid
}

const QB: TorrentClientDriver = {
    definition: {
        id    : 'qbittorrent',
        label : 'qBittorrent',
        fields: [
            { key: 'url',      label: 'URL WebUI',     type: 'url',      placeholder: 'http://localhost:8080', required: true },
            { key: 'username', label: 'Identifiant',   type: 'text',     placeholder: 'admin',                required: true },
            { key: 'password', label: 'Mot de passe',  type: 'password', placeholder: '••••••••',             required: true },
            { key: 'category', label: 'Catégorie',     type: 'text',     placeholder: 'fankai',               required: false, default: 'fankai' },
        ],
    },

    async test(config) {
        try {
            await qbLogin(config)
            return { ok: true, message: 'Connexion réussie' }
        } catch (err) {
            return { ok: false, message: err instanceof Error ? err.message : 'Erreur inconnue' }
        }
    },

    async healthcheck(config) {
        try {
            const sid = await qbLogin(config)
            const res = await fetch(`${config.url}/api/v2/app/version`, {
                headers: { Cookie: `SID=${sid}` }
            })
            if (!res.ok) return { online: false }
            return { online: true, version: (await res.text()).trim() }
        } catch {
            return { online: false }
        }
    },

    async list(config, category) {
        const sid = await qbLogin(config)
        const params = new URLSearchParams()
        if (category) params.set('category', category)
        const res = await fetch(`${config.url}/api/v2/torrents/info?${params}`, {
            headers: { Cookie: `SID=${sid}` }
        })
        if (!res.ok) throw new Error(`qB list échoué: ${res.status}`)
        const data: any[] = await res.json()
        return data.map(t => ({
            hash      : t.hash,
            name      : t.name,
            state     : mapState(t.state),
            progress  : Math.round(t.progress * 100),
            size      : t.size,
            downloaded: t.downloaded,
            speed     : t.dlspeed,
            eta       : t.eta ?? -1,
            save_path : t.save_path,
            category  : t.category ?? '',
        } satisfies TorrentInfo))
    },

    async add(config, url) {
        const sid = await qbLogin(config)
        const form = new FormData()
        form.append('urls', url)
        if (config.category) form.append('category', String(config.category))
        if (config.savePath)  form.append('savepath', String(config.savePath))
        const res = await fetch(`${config.url}/api/v2/torrents/add`, {
            method : 'POST',
            body   : form,
            headers: { Cookie: `SID=${sid}` },
        })
        const text = await res.text()
        if (text !== 'Ok.') throw new Error(`Ajout échoué : ${text}`)
    },
}

export default QB