/*
|--------------------------------------------------------------------------
| Agência PSI — Edge Function: evolution-whatsapp-inbound
|--------------------------------------------------------------------------
| Recebe webhooks da Evolution API (self-hosted WhatsApp Baileys-based) para
| mensagens recebidas pelos tenants.
|
| Midia (audio/imagem/video/doc):
|   A Evolution envia a URL criptografada da Meta (mmg.whatsapp.net/...)
|   que NAO e diretamente tocavel. Chamamos o endpoint
|   POST /chat/getBase64FromMediaMessage/{instance} pra Evolution decriptar,
|   decodamos o base64 e subimos pro bucket privado `whatsapp-media` do
|   Supabase Storage. Salvamos apenas o PATH em media_url; o frontend gera
|   signed URL on-demand.
|
| URL do webhook:
|   https://<project>.supabase.co/functions/v1/evolution-whatsapp-inbound?tenant_id=<uuid>
|--------------------------------------------------------------------------
*/

import { createClient, SupabaseClient } from 'https://esm.sh/@supabase/supabase-js@2'
import {
    buildThreadKey,
    detectOptoutKeyword,
    maybeOptIn,
    maybeSendAutoReply,
    registerOptout,
    type SendFn
} from '../_shared/whatsapp-hooks.ts'

const corsHeaders = {
    'Access-Control-Allow-Origin':  '*',
    'Access-Control-Allow-Headers': 'authorization, x-client-info, apikey, content-type',
    'Access-Control-Allow-Methods': 'POST, GET, OPTIONS',
}

const BUCKET = 'whatsapp-media'

// Edge function roda em container — localhost aponta pra ele mesmo, nao pro host.
function rewriteForContainer(apiUrl: string): string {
    try {
        const u = new URL(apiUrl)
        if (u.hostname === 'localhost' || u.hostname === '127.0.0.1') {
            u.hostname = 'host.docker.internal'
            return u.toString().replace(/\/+$/, '')
        }
        return apiUrl.replace(/\/+$/, '')
    } catch {
        return apiUrl
    }
}

function jidToPhone(jid: string | undefined | null): string | null {
    if (!jid) return null
    const m = String(jid).match(/^(\d+)@/)
    return m ? m[1] : null
}

// Mapeia mime → extensao pra nome do arquivo
function extFromMime(mime: string | null | undefined): string {
    if (!mime) return 'bin'
    const m = mime.toLowerCase().split(';')[0].trim()
    const map: Record<string, string> = {
        'audio/ogg': 'ogg',
        'audio/mpeg': 'mp3',
        'audio/mp4': 'm4a',
        'audio/aac': 'aac',
        'audio/wav': 'wav',
        'audio/webm': 'webm',
        'image/jpeg': 'jpg',
        'image/png': 'png',
        'image/webp': 'webp',
        'image/gif': 'gif',
        'video/mp4': 'mp4',
        'video/3gpp': '3gp',
        'video/quicktime': 'mov',
        'video/webm': 'webm',
        'application/pdf': 'pdf',
        'application/msword': 'doc',
        'application/vnd.openxmlformats-officedocument.wordprocessingml.document': 'docx',
        'application/vnd.ms-excel': 'xls',
        'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet': 'xlsx',
        'text/plain': 'txt',
        'application/zip': 'zip'
    }
    return map[m] ?? 'bin'
}

// Extrai body + indicador de tipo de midia do payload
type MessageParts = {
    body: string | null
    mediaUrl: string | null
    mediaMime: string | null
    hasEncryptedMedia: boolean   // true se precisa chamar getBase64 pra decriptar
}

function extractMessageBody(message: Record<string, unknown> | null | undefined): MessageParts {
    if (!message) return { body: null, mediaUrl: null, mediaMime: null, hasEncryptedMedia: false }

    if (typeof (message as { conversation?: unknown }).conversation === 'string') {
        return { body: (message as { conversation: string }).conversation, mediaUrl: null, mediaMime: null, hasEncryptedMedia: false }
    }
    const ext = (message as { extendedTextMessage?: { text?: string } }).extendedTextMessage
    if (ext?.text) {
        return { body: ext.text, mediaUrl: null, mediaMime: null, hasEncryptedMedia: false }
    }
    const img = (message as { imageMessage?: { caption?: string; url?: string; mimetype?: string } }).imageMessage
    if (img) {
        return { body: img.caption ?? '[imagem]', mediaUrl: img.url ?? null, mediaMime: img.mimetype ?? 'image/jpeg', hasEncryptedMedia: true }
    }
    const aud = (message as { audioMessage?: { url?: string; mimetype?: string } }).audioMessage
    if (aud) {
        return { body: '[áudio]', mediaUrl: aud.url ?? null, mediaMime: aud.mimetype ?? 'audio/ogg', hasEncryptedMedia: true }
    }
    const vid = (message as { videoMessage?: { caption?: string; url?: string; mimetype?: string } }).videoMessage
    if (vid) {
        return { body: vid.caption ?? '[vídeo]', mediaUrl: vid.url ?? null, mediaMime: vid.mimetype ?? 'video/mp4', hasEncryptedMedia: true }
    }
    const doc = (message as { documentMessage?: { title?: string; fileName?: string; url?: string; mimetype?: string } }).documentMessage
    if (doc) {
        return { body: `[doc] ${doc.title ?? doc.fileName ?? ''}`.trim(), mediaUrl: doc.url ?? null, mediaMime: doc.mimetype ?? 'application/octet-stream', hasEncryptedMedia: true }
    }

    return { body: '[mensagem não textual]', mediaUrl: null, mediaMime: null, hasEncryptedMedia: false }
}

// Decodifica base64 (com ou sem prefixo data: URI) para Uint8Array
function base64ToBytes(b64: string): Uint8Array {
    const clean = b64.replace(/^data:[^;]+;base64,/, '')
    const bin = atob(clean)
    const out = new Uint8Array(bin.length)
    for (let i = 0; i < bin.length; i++) out[i] = bin.charCodeAt(i)
    return out
}

type EvolutionCreds = { apiUrl: string; apiKey: string; instance: string }

// Busca credenciais Evolution do tenant em notification_channels
async function getTenantEvolutionCreds(supa: SupabaseClient, tenantId: string): Promise<EvolutionCreds | null> {
    const { data: channel, error } = await supa
        .from('notification_channels')
        .select('credentials')
        .eq('tenant_id', tenantId)
        .eq('channel', 'whatsapp')
        .is('deleted_at', null)
        .maybeSingle()

    if (error || !channel) return null
    const c = (channel.credentials ?? {}) as Record<string, string>
    if (!c.api_url || !c.api_key || !c.instance_name) return null
    return { apiUrl: c.api_url, apiKey: c.api_key, instance: c.instance_name }
}

// Chama Evolution pra decriptar a midia; retorna base64 string
async function fetchMediaBase64FromEvolution(creds: EvolutionCreds, messageNode: Record<string, unknown>): Promise<string | null> {
    const endpoint = `${rewriteForContainer(creds.apiUrl)}/chat/getBase64FromMediaMessage/${encodeURIComponent(creds.instance)}`
    try {
        const resp = await fetch(endpoint, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json', apikey: creds.apiKey },
            // Evolution v2 aceita o proprio data.message (node com key + message) ou so a key
            body: JSON.stringify({ message: messageNode, convertToMp4: false })
        })
        const text = await resp.text()
        if (!resp.ok) {
            console.error('[evolution-whatsapp-inbound] getBase64 HTTP error', resp.status, text.slice(0, 300))
            return null
        }
        let j: Record<string, unknown> | null = null
        try { j = JSON.parse(text) } catch { /* fica null */ }
        if (!j) return null
        // Resposta pode vir como { base64: "..." } ou { data: { base64: "..." } }
        const b64 = (j as { base64?: string }).base64
            ?? (j as { data?: { base64?: string } }).data?.base64
            ?? null
        return typeof b64 === 'string' && b64.length > 0 ? b64 : null
    } catch (err) {
        console.error('[evolution-whatsapp-inbound] getBase64 fetch error:', err)
        return null
    }
}

// Envia texto via Evolution (usado como SendFn injetado nos hooks compartilhados)
async function sendViaEvolution(
    creds: EvolutionCreds,
    phone: string,
    text: string
): Promise<{ ok: boolean; messageId?: string | null; error?: string }> {
    try {
        const endpoint = `${rewriteForContainer(creds.apiUrl)}/message/sendText/${encodeURIComponent(creds.instance)}`
        const resp = await fetch(endpoint, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json', apikey: creds.apiKey },
            body: JSON.stringify({ number: phone, text })
        })
        if (!resp.ok) {
            const t = await resp.text()
            return { ok: false, error: `HTTP ${resp.status}: ${t.slice(0, 200)}` }
        }
        const j = await resp.json().catch(() => null) as Record<string, unknown> | null
        const msgId = (j?.key as { id?: string })?.id ?? null
        return { ok: true, messageId: msgId }
    } catch (err) {
        return { ok: false, error: String(err) }
    }
}

// Sobe os bytes decodificados pro bucket, retorna path relativo (sem bucket prefix)
async function uploadToBucket(
    supa: SupabaseClient,
    tenantId: string,
    bytes: Uint8Array,
    mime: string,
    messageId: string | null
): Promise<string | null> {
    const now = new Date()
    const yyyy = now.getFullYear()
    const mm = String(now.getMonth() + 1).padStart(2, '0')
    const safeId = (messageId ?? crypto.randomUUID()).replace(/[^A-Za-z0-9_-]/g, '_').slice(0, 64)
    const ext = extFromMime(mime)
    const path = `${tenantId}/${yyyy}/${mm}/${safeId}_${Date.now()}.${ext}`

    // Strip codec params (ex: "audio/ogg; codecs=opus" → "audio/ogg")
    // Supabase Storage allowed_mime_types faz match exato contra o contentType
    const cleanMime = (mime || '').split(';')[0].trim() || 'application/octet-stream'

    const { error } = await supa.storage.from(BUCKET).upload(path, bytes, {
        contentType: cleanMime,
        upsert: false,
        cacheControl: '3600'
    })
    if (error) {
        console.error('[evolution-whatsapp-inbound] upload error:', error.message, 'mime:', cleanMime, 'path:', path)
        return null
    }
    return path
}

Deno.serve(async (req: Request) => {
    if (req.method === 'OPTIONS') {
        return new Response('ok', { headers: corsHeaders })
    }
    if (req.method !== 'POST') {
        return new Response(JSON.stringify({ ok: true }), { status: 200, headers: { ...corsHeaders, 'Content-Type': 'application/json' } })
    }

    try {
        const url = new URL(req.url)
        const tenantId = url.searchParams.get('tenant_id')
        if (!tenantId) {
            return new Response(JSON.stringify({ ok: false, error: 'tenant_id ausente' }), {
                status: 200,
                headers: { ...corsHeaders, 'Content-Type': 'application/json' }
            })
        }

        const supabase = createClient(
            Deno.env.get('SUPABASE_URL')!,
            Deno.env.get('SUPABASE_SERVICE_ROLE_KEY')!
        )

        const payload = await req.json().catch(() => null)
        if (!payload || typeof payload !== 'object') {
            return new Response(JSON.stringify({ ok: true, skipped: 'payload invalido' }), {
                status: 200,
                headers: { ...corsHeaders, 'Content-Type': 'application/json' }
            })
        }

        const eventName = (payload as { event?: string }).event

        // messages.update → atualiza delivery_status da outbound
        if (eventName === 'messages.update') {
            const updates = ((payload as { data?: unknown }).data ?? []) as Array<Record<string, unknown>>
            const arr = Array.isArray(updates) ? updates : [updates]
            for (const u of arr) {
                const k = (u as { key?: Record<string, unknown> }).key ?? {}
                const msgId = (k as { id?: string }).id
                const rawStatus = String((u as { status?: string }).status ?? '').toUpperCase()
                if (!msgId || !rawStatus) continue
                const delivery =
                    rawStatus === 'READ' ? 'read' :
                    rawStatus === 'DELIVERY_ACK' || rawStatus === 'DELIVERED' ? 'delivered' :
                    rawStatus === 'SERVER_ACK' || rawStatus === 'SENT' ? 'sent' :
                    rawStatus === 'ERROR' || rawStatus === 'FAILED' ? 'failed' :
                    null
                if (!delivery) continue
                const patch: Record<string, unknown> = { delivery_status: delivery }
                if (delivery === 'delivered') patch.delivered_at = new Date().toISOString()
                if (delivery === 'read') {
                    patch.read_by_recipient_at = new Date().toISOString()
                    patch.delivered_at = patch.delivered_at ?? new Date().toISOString()
                }
                await supabase
                    .from('conversation_messages')
                    .update(patch)
                    .eq('tenant_id', tenantId)
                    .eq('provider_message_id', msgId)
                    .eq('direction', 'outbound')
            }
            return new Response(JSON.stringify({ ok: true, event: eventName, processed: arr.length }), {
                status: 200,
                headers: { ...corsHeaders, 'Content-Type': 'application/json' }
            })
        }

        if (eventName !== 'messages.upsert') {
            return new Response(JSON.stringify({ ok: true, skipped: eventName }), {
                status: 200,
                headers: { ...corsHeaders, 'Content-Type': 'application/json' }
            })
        }

        const data = (payload as { data?: Record<string, unknown> }).data ?? {}
        const key = (data as { key?: Record<string, unknown> }).key ?? {}
        const fromMe = (key as { fromMe?: boolean }).fromMe === true
        const messageId = (key as { id?: string }).id ?? null

        const remoteJid = (key as { remoteJid?: string }).remoteJid
        if (!remoteJid || remoteJid.endsWith('@g.us')) {
            return new Response(JSON.stringify({ ok: true, skipped: 'grupo/sem jid' }), {
                status: 200,
                headers: { ...corsHeaders, 'Content-Type': 'application/json' }
            })
        }

        const fromPhone = jidToPhone(remoteJid)
        const messageObj = (data as { message?: Record<string, unknown> }).message
        const pushName = (data as { pushName?: string }).pushName ?? null
        const ts = (data as { messageTimestamp?: number | string }).messageTimestamp

        const parts = extractMessageBody(messageObj)

        const cleanBody = parts.body
            ? String(parts.body).replace(/[\x00-\x08\x0B\x0C\x0E-\x1F]/g, '').slice(0, 4000)
            : null

        // Decripta + sobe midia pro bucket se necessario
        let storedMediaUrl: string | null = parts.mediaUrl
        let mediaError: string | null = null
        if (parts.hasEncryptedMedia && messageObj && parts.mediaMime) {
            const creds = await getTenantEvolutionCreds(supabase, tenantId)
            if (!creds) {
                mediaError = 'creds_not_found'
                storedMediaUrl = null
            } else {
                // Evolution v2 espera o node completo {key, message}
                const messageNode = { key, message: messageObj }
                const b64 = await fetchMediaBase64FromEvolution(creds, messageNode)
                if (!b64) {
                    mediaError = 'decrypt_failed'
                    storedMediaUrl = null
                } else {
                    try {
                        const bytes = base64ToBytes(b64)
                        // Sanity check: nao aceita arquivo vazio ou gigante
                        if (bytes.length === 0) {
                            mediaError = 'empty_media'
                            storedMediaUrl = null
                        } else if (bytes.length > 26214400) {
                            mediaError = 'too_large'
                            storedMediaUrl = null
                        } else {
                            const path = await uploadToBucket(supabase, tenantId, bytes, parts.mediaMime, messageId)
                            if (path) {
                                storedMediaUrl = path  // salva apenas o PATH (frontend gera signed URL)
                            } else {
                                mediaError = 'upload_failed'
                                storedMediaUrl = null
                            }
                        }
                    } catch (err) {
                        console.error('[evolution-whatsapp-inbound] decode error:', err)
                        mediaError = 'decode_error'
                        storedMediaUrl = null
                    }
                }
            }
        }

        const { data: matchData } = await supabase.rpc('match_patient_by_phone', {
            p_tenant_id: tenantId,
            p_phone: fromPhone
        })
        const patientId = matchData as string | null

        const receivedAt = ts
            ? new Date(Number(ts) * (String(ts).length === 10 ? 1000 : 1)).toISOString()
            : new Date().toISOString()

        // Dedup outbound echo
        if (fromMe && messageId) {
            const { data: existing } = await supabase
                .from('conversation_messages')
                .select('id')
                .eq('tenant_id', tenantId)
                .eq('provider_message_id', messageId)
                .eq('direction', 'outbound')
                .maybeSingle()

            if (existing?.id) {
                return new Response(JSON.stringify({ ok: true, echo_dedup: true }), {
                    status: 200,
                    headers: { ...corsHeaders, 'Content-Type': 'application/json' }
                })
            }
        }

        const direction = fromMe ? 'outbound' : 'inbound'
        const kanbanStatus = fromMe ? 'awaiting_patient' : 'awaiting_us'

        const { error: insErr } = await supabase.from('conversation_messages').insert({
            tenant_id: tenantId,
            patient_id: patientId,
            channel: 'whatsapp',
            direction,
            from_number: fromMe ? null : fromPhone,
            to_number: fromMe ? fromPhone : null,
            body: cleanBody,
            media_url: storedMediaUrl,
            media_mime: parts.mediaMime,
            provider: 'evolution',
            provider_message_id: messageId ?? null,
            provider_raw: { event: eventName, pushName, remoteJid, fromMe, mediaError },
            kanban_status: kanbanStatus,
            received_at: fromMe ? null : receivedAt,
            responded_at: fromMe ? receivedAt : null
        })

        if (insErr) {
            console.error('[evolution-whatsapp-inbound] insert error:', insErr)
        }

        // Opt-out / Opt-in detection (apenas pra inbound)
        let optoutAction: 'out' | 'in' | null = null
        let autoReplyResult: { sent: boolean; reason?: string } | null = null

        if (!fromMe && !insErr && fromPhone) {
            // SendFn injetado: Evolution nao deduz creditos (provider gratis/self-hosted)
            const creds = await getTenantEvolutionCreds(supabase, tenantId)
            const sendFn: SendFn = creds
                ? (phone, text) => sendViaEvolution(creds, phone, text)
                : async () => ({ ok: false, error: 'creds_missing' })

            try {
                const optedBackIn = await maybeOptIn(supabase, tenantId, fromPhone, cleanBody)
                if (optedBackIn) optoutAction = 'in'
            } catch (err) {
                console.error('[optout] opt-in check error:', err)
            }

            if (!optoutAction) {
                try {
                    const keyword = await detectOptoutKeyword(supabase, tenantId, cleanBody)
                    if (keyword) {
                        await registerOptout(supabase, tenantId, fromPhone, patientId, cleanBody, keyword, 'evolution', sendFn)
                        optoutAction = 'out'
                    }
                } catch (err) {
                    console.error('[optout] detect error:', err)
                }
            }

            if (optoutAction !== 'out') {
                const threadKey = buildThreadKey(patientId, fromPhone)
                try {
                    autoReplyResult = await maybeSendAutoReply(supabase, tenantId, threadKey, fromPhone, 'evolution', sendFn)
                } catch (err) {
                    console.error('[auto-reply] unexpected error:', err)
                }
            }
        }

        return new Response(JSON.stringify({ ok: true, mediaError, optoutAction, autoReply: autoReplyResult }), {
            status: 200,
            headers: { ...corsHeaders, 'Content-Type': 'application/json' }
        })
    } catch (err) {
        console.error('[evolution-whatsapp-inbound] fatal:', err)
        return new Response(JSON.stringify({ ok: false, error: String(err) }), {
            status: 200,
            headers: { ...corsHeaders, 'Content-Type': 'application/json' }
        })
    }
})