import { prisma } from './prisma';
import { logger } from '../logger';
import { redis } from '../lib/redis';

const CACHE_TTL = 86400; // 24 hours (routing is stable)
const META_GRAPH_VERSION = process.env.META_GRAPH_API_VERSION || 'v22.0';

export async function getOrganizationByPhoneNumberId(phoneNumberId: string): Promise<string | null> {
    const cacheKey = `org:phone:${phoneNumberId}`;
    
    // 1. Check Redis Cache
    try {
        const cached = await redis.get(cacheKey);
        if (cached) return cached;
    } catch (err) {
        logger.error({ err }, '[ORG-SERVICE] Redis error:');
    }

    // 2. Lookup in DB
    const phoneRecord = await prisma.whatsAppPhoneNumber.findUnique({
        where: { id: phoneNumberId },
        select: { organizationId: true }
    });

    if (phoneRecord) {
        try {
            await redis.set(cacheKey, phoneRecord.organizationId, 'EX', CACHE_TTL);
        } catch (err) {
            logger.error({ err }, '[ORG-SERVICE] Redis set error:');
        }
        return phoneRecord.organizationId;
    }

    logger.warn(`[ORG-SERVICE] No organization found for phone_number_id: ${phoneNumberId} — rejecting`);
    return null;
}

/**
 * Invalidates all cache entries related to an organization
 */
export async function invalidateOrganizationCache(organizationId: string, phoneNumberId?: string) {
    try {
        const keys = [`org:config:${organizationId}`];
        if (phoneNumberId) {
            keys.push(`org:phone:${phoneNumberId}`);
        }
        await redis.del(keys);
        logger.info(`[ORG-SERVICE] Cache invalidated for Organization: ${organizationId}`);
    } catch (err) {
        logger.error({ err }, '[ORG-SERVICE] Cache invalidation failed:');
    }
}

import { config } from '../config';
const ENCRYPTION_SECRET = config.ENCRYPTION_SECRET;

import { encrypt, decrypt } from '@repo/shared-types';

export function encryptSecrets(data: any) {
    if (data.systemUserToken && !data.systemUserToken.startsWith('enc:')) {
        data.systemUserToken = encrypt(data.systemUserToken, ENCRYPTION_SECRET);
    }
    if (data.webhookSecret && !data.webhookSecret.startsWith('enc:')) {
        data.webhookSecret = encrypt(data.webhookSecret, ENCRYPTION_SECRET);
    }
    if (data.openAiApiKey && !data.openAiApiKey.startsWith('enc:')) {
        data.openAiApiKey = encrypt(data.openAiApiKey, ENCRYPTION_SECRET);
    }
    if (data.googleAiApiKey && !data.googleAiApiKey.startsWith('enc:')) {
        data.googleAiApiKey = encrypt(data.googleAiApiKey, ENCRYPTION_SECRET);
    }
    return data;
}

export function decryptSecrets(org: any) {
    return {
        ...org,
        ...(org.systemUserToken ? { systemUserToken: decrypt(org.systemUserToken, ENCRYPTION_SECRET) } : {}),
        ...(org.webhookSecret ? { webhookSecret: decrypt(org.webhookSecret, ENCRYPTION_SECRET) } : {}),
        ...(org.openAiApiKey ? { openAiApiKey: decrypt(org.openAiApiKey, ENCRYPTION_SECRET) } : {}),
        ...(org.googleAiApiKey ? { googleAiApiKey: decrypt(org.googleAiApiKey, ENCRYPTION_SECRET) } : {}),
    };
}

// ─── Meta Graph API response shapes ─────────────────────────────────────────

interface MetaApiError { message: string; type?: string; code?: number }

interface WabaStatusResponse {
    account_review_status?: 'APPROVED' | 'PENDING' | 'REJECTED' | 'BANNED' | 'UNKNOWN';
    error?: MetaApiError;
}

interface BusinessVerificationResponse {
    id?: string;
    name?: string;
    verification_status?: string;
    error?: MetaApiError;
}

interface WabaBusinessEdgeResponse {
    business?: { id: string; name: string; verification_status: string };
    error?: MetaApiError;
}

interface WabaOnBehalfResponse {
    on_behalf_of_business_info?: { id: string; name?: string };
    error?: MetaApiError;
}

interface PhoneNumberTierResponse {
    messaging_limit_tier?: string;
    quality_rating?: 'GREEN' | 'YELLOW' | 'RED' | 'UNKNOWN';
    error?: MetaApiError;
}

// ─── Meta Business Status ─────────────────────────────────────────────────────

export interface MetaStatus {
    configured: boolean;
    wabaStatus?: 'APPROVED' | 'PENDING' | 'REJECTED' | 'BANNED' | 'UNKNOWN';
    businessId?: string;
    businessName?: string;
    businessVerified?: boolean;
    messagingLimitTier?: string;  // e.g. TIER_1K, TIER_10K, TIER_100K, UNLIMITED
    qualityRating?: 'GREEN' | 'YELLOW' | 'RED' | 'UNKNOWN';
    tokenIssuedAt?: string;       // ISO date — to compute days until 60-day expiry
    syncedAt: string;
    error?: string;
}

export async function fetchMetaStatus(organizationId: string, forceRefresh = false): Promise<MetaStatus> {
    const cacheKey = `meta:status:${organizationId}`;

    if (!forceRefresh) {
        try {
            const cached = await redis.get(cacheKey);
            if (cached) return JSON.parse(cached) as MetaStatus;
        } catch (err) {
            logger.error({ err }, '[META-STATUS] Redis get error');
        }
    }

    // Organization is excluded from tenant filtering — safe to query cross-org.
    // Include phoneNumbers here to avoid a separate WhatsAppPhoneNumber query
    // which IS tenant-filtered and would return null when called from another org's context.
    const org = await prisma.organization.findUnique({
        where: { id: organizationId },
        include: { phoneNumbers: { take: 1 } }
    });
    if (!org?.wabaId || !org?.systemUserToken) {
        return { configured: false, syncedAt: new Date().toISOString() };
    }

    const decrypted = decryptSecrets({ ...org });

    const headers = { Authorization: `Bearer ${decrypted.systemUserToken}` };

    // Call 1 — WABA status (critical, must succeed)
    let wabaStatus: MetaStatus['wabaStatus'] = 'UNKNOWN';
    let wabaError: string | undefined;
    try {
        const wabaRes = await fetch(
            `https://graph.facebook.com/${META_GRAPH_VERSION}/${org.wabaId}?fields=account_review_status`,
            { headers }
        );
        const wabaData = await wabaRes.json() as WabaStatusResponse;
        if (wabaData.error) {
            wabaError = wabaData.error.message;
            logger.warn({ err: wabaData.error, organizationId }, '[META-STATUS] WABA status error');
        } else {
            wabaStatus = wabaData.account_review_status ?? 'UNKNOWN';
        }
    } catch (err) {
        wabaError = 'Network error';
        logger.error({ err, organizationId }, '[META-STATUS] WABA fetch failed');
    }

    // Call 2 — Business verification (optional, three attempts in priority order)
    let businessId: string | undefined;
    let businessName: string | undefined;
    let businessVerified: boolean | undefined;

    // Attempt A: stored metaBusinessId — most reliable, bypasses WABA edge permissions
    if (org.metaBusinessId) {
        try {
            const vRes = await fetch(
                `https://graph.facebook.com/${META_GRAPH_VERSION}/${org.metaBusinessId}?fields=name,verification_status`,
                { headers }
            );
            const vData = await vRes.json() as BusinessVerificationResponse;
            if (!vData.error) {
                businessId = org.metaBusinessId;
                businessName = vData.name;
                businessVerified = vData.verification_status === 'verified';
            }
        } catch { /* non-fatal */ }
    }

    // Attempt B: business edge on WABA (works on production WABAs with business_management scope)
    if (businessId === undefined) {
        try {
            const bizRes = await fetch(
                `https://graph.facebook.com/${META_GRAPH_VERSION}/${org.wabaId}?fields=business{id,name,verification_status}`,
                { headers }
            );
            const bizData = await bizRes.json() as WabaBusinessEdgeResponse;
            if (!bizData.error && bizData.business) {
                businessId = bizData.business.id;
                businessName = bizData.business.name;
                businessVerified = bizData.business.verification_status === 'verified';
            }
        } catch { /* non-fatal */ }
    }

    // Attempt C: on_behalf_of_business_info fallback (broader token compatibility)
    if (businessId === undefined) {
        try {
            const obRes = await fetch(
                `https://graph.facebook.com/${META_GRAPH_VERSION}/${org.wabaId}?fields=on_behalf_of_business_info`,
                { headers }
            );
            const obData = await obRes.json() as WabaOnBehalfResponse;
            if (!obData.error && obData.on_behalf_of_business_info?.id) {
                businessId = obData.on_behalf_of_business_info.id;
                businessName = obData.on_behalf_of_business_info.name;
                const vRes = await fetch(
                    `https://graph.facebook.com/${META_GRAPH_VERSION}/${businessId}?fields=name,verification_status`,
                    { headers }
                );
                const vData = await vRes.json() as BusinessVerificationResponse;
                if (!vData.error) {
                    businessVerified = vData.verification_status === 'verified';
                    if (vData.name) businessName = vData.name;
                }
            }
        } catch { /* non-fatal */ }
    }

    // Call 3 — Phone number messaging tier + quality rating (live from Meta)
    let messagingLimitTier: string | undefined;
    let qualityRating: MetaStatus['qualityRating'] | undefined;
    try {
        const phoneNumberId = org.phoneNumbers?.[0]?.id;
        if (phoneNumberId) {
            const phoneRes = await fetch(
                `https://graph.facebook.com/${META_GRAPH_VERSION}/${phoneNumberId}?fields=messaging_limit_tier,quality_rating`,
                { headers }
            );
            const phoneData = await phoneRes.json() as PhoneNumberTierResponse;
            if (!phoneData.error) {
                messagingLimitTier = phoneData.messaging_limit_tier;
                qualityRating = phoneData.quality_rating;
                if (!messagingLimitTier) {
                    logger.warn({ organizationId, phoneNumberId, raw: phoneData }, '[META-STATUS] messaging_limit_tier absent — token may lack BUSINESS_MANAGEMENT permission');
                }
            } else {
                logger.warn({ err: phoneData.error, organizationId, phoneNumberId }, '[META-STATUS] Phone tier fetch error');
            }
        }
    } catch (err) {
        logger.error({ err, organizationId }, '[META-STATUS] Phone tier fetch threw');
    }

    const result: MetaStatus = {
        configured: true,
        wabaStatus,
        businessId,
        businessName,
        businessVerified,
        messagingLimitTier,
        qualityRating,
        tokenIssuedAt: org.systemUserTokenIssuedAt?.toISOString(),
        syncedAt: new Date().toISOString(),
        ...(wabaError && { error: wabaError })
    };

    const ttl = wabaError ? 300 : 3600;
    await redis.set(cacheKey, JSON.stringify(result), 'EX', ttl).catch(err =>
        logger.error({ err }, '[META-STATUS] Redis set error')
    );
    return result;
}

// ─── Tenant Secrets ──────────────────────────────────────────────────────────

/**
 * Retrieves all secrets for a tenant, decrypted.
 */
export async function getTenantSecrets(organizationId: string) {
    const org = await prisma.organization.findUnique({
        where: { id: organizationId },
        select: {
            systemUserToken: true,
            webhookSecret: true,
            openAiApiKey: true,
            googleAiApiKey: true,
        }
    });
    
    if (!org) return null;
    return decryptSecrets(org);
}