import { API_URL, API_KEY, TTS_URL, TTS_STATUS_URL } from './config.js'
import { useSettingsStore } from '../stores/settings'

function generateRequestId() {
    if (typeof crypto !== 'undefined' && typeof crypto.randomUUID === 'function') {
        return crypto.randomUUID()
    }
    return `${Date.now()}-${Math.random().toString(16).slice(2)}`
}

function getCancelUrl(apiUrl) {
    const normalized = String(apiUrl || '').replace(/\/+$/, '')
    if (!normalized) return '/v1/completions/cancel'
    if (normalized.endsWith('/v1/completions')) {
        return `${normalized}/cancel`
    }
    return `${normalized}/cancel`
}

function normalizeAbortReason(reason) {
    if (typeof reason === 'string' && reason.trim()) {
        return reason.trim().slice(0, 64)
    }
    return 'abort'
}

async function sendCancelRequest(cancelUrl, requestId, reason) {
    try {
        await fetch(cancelUrl, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json',
                'X-API-Key': API_KEY,
            },
            body: JSON.stringify({
                request_id: requestId,
                reason,
            }),
        })
    } catch {
        // Cancel request failed silently
    }
}

export async function fetchSuggestion(prefix, suffix, languageId, signal, apiUrl = API_URL) {
    let normalizedLanguageId = 'markdown'
    if (typeof languageId === 'string' && languageId.trim()) {
        normalizedLanguageId = languageId.trim()
    } else if (languageId && typeof languageId === 'object' && 'aborted' in languageId) {
        signal = languageId
    }
    if (typeof signal === 'string') {
        apiUrl = signal
        signal = undefined
    }
    const requestId = generateRequestId()
    const cancelUrl = getCancelUrl(apiUrl)

    const onAbort = () => {
        const reason = normalizeAbortReason(signal?.reason)
        void sendCancelRequest(cancelUrl, requestId, reason)
    }

    if (signal) {
        if (signal.aborted) {
            onAbort()
        } else {
            signal.addEventListener('abort', onAbort, { once: true })
        }
    }

    try {
        const settings = useSettingsStore()
        const headers = {
            'Content-Type': 'application/json',
            'X-Request-Id': requestId,
            'X-API-Key': API_KEY,
        }

        const body = {
            prefix,
            suffix,
            languageId: normalizedLanguageId,
            model_thinking: settings.modelThinking,
            privacy_mode: settings.privacyMode,
            user_preferences: {
                language: settings.language,
                currency: settings.currency,
                timezone: settings.detectedTimezone,
            },
        }

        const res = await fetch(apiUrl, {
            method: 'POST',
            headers,
            body: JSON.stringify(body),
            signal,
        })

        if (!res.ok) {
            const errorText = await res.text()
            throw new Error(`HTTP ${res.status}: ${errorText}`)
        }

        const data = await res.json()
        return data.content || ''
    } catch (e) {
        if (e.name === 'AbortError') {
            // ignore abort
        } else {
            throw e
        }
    } finally {
        if (signal) {
            signal.removeEventListener('abort', onAbort)
        }
    }
}

export async function fetchTTS(text, voice = 'af_bella', rate = 1.0, apiUrl = TTS_URL) {
    const res = await fetch(apiUrl, {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json',
            'X-API-Key': API_KEY,
        },
        body: JSON.stringify({ text, voice, rate, format: 'wav' }),
    })

    if (!res.ok) {
        const errorText = await res.text()
        throw new Error(`TTS HTTP ${res.status}: ${errorText}`)
    }

    return res.json()
}

export async function fetchTTSStatus(apiUrl = TTS_STATUS_URL) {
    const res = await fetch(apiUrl, {
        headers: { 'X-API-Key': API_KEY },
    })

    if (!res.ok) {
        throw new Error(`TTS Status HTTP ${res.status}`)
    }

    return res.json()
}