// ============================================
// MCP Tools — Typed wrappers for Meta MCP tools
// ============================================

import { callMetaTool, type Client } from './client';

// ---- Helper: extract text content from MCP result ----
function extractContent(result: Awaited<ReturnType<typeof callMetaTool>>): unknown {
  if (!result.content || !Array.isArray(result.content)) return null;

  const textPart = result.content.find((c: { type: string }) => c.type === 'text');
  if (!textPart || !('text' in textPart)) return null;

  try {
    return JSON.parse(textPart.text as string);
  } catch {
    return textPart.text;
  }
}

function requireId(value: unknown, label: string) {
  if (!value || typeof value !== 'string') {
    throw new Error(`${label} obrigatório não informado`);
  }
}

function getDefaultOptimizationGoal(objective: string, destination?: string) {
  if (destination === 'WHATSAPP') {
    return 'CONVERSATIONS';
  }

  switch (objective) {
    case 'OUTCOME_TRAFFIC':
      return 'LINK_CLICKS';

    case 'OUTCOME_AWARENESS':
      return 'REACH';

    case 'OUTCOME_ENGAGEMENT':
      return 'POST_ENGAGEMENT';

    case 'OUTCOME_LEADS':
      return 'LEAD_GENERATION';

    case 'OUTCOME_SALES':
      // OFFSITE_CONVERSIONS requires a pixel_id. Since we don't have it in MVP, fallback to LINK_CLICKS
      return 'LINK_CLICKS';

    default:
      return 'LINK_CLICKS';
  }
}

function getDefaultBillingEvent(objective: string) {
  switch (objective) {
    case 'OUTCOME_TRAFFIC':
    case 'OUTCOME_AWARENESS':
    case 'OUTCOME_ENGAGEMENT':
    case 'OUTCOME_LEADS':
    case 'OUTCOME_SALES':
    default:
      return 'IMPRESSIONS';
  }
}

function normalizeBidCapParams(params: {
  bid_strategy?: string;
  bid_amount?: number;
}) {
  if (!params.bid_strategy && !params.bid_amount) return {};

  const bidStrategy = params.bid_strategy || 'LOWEST_COST_WITH_BID_CAP';

  if (bidStrategy === 'LOWEST_COST_WITH_BID_CAP' && !params.bid_amount) {
    throw new Error('Para campanha Bid Cap, informe bid_amount em centavos. Exemplo: R$10,00 = 1000.');
  }

  return {
    bid_strategy: bidStrategy,
    bid_amount: params.bid_amount,
  };
}

// ==============================
// Campaign Management
// ==============================

export async function listCampaigns(client: Client, accountId?: string, datePreset: string = 'last_30d') {
  const args: Record<string, unknown> = { date_preset: datePreset };
  if (accountId) args.ad_account_id = accountId;

  const result = await callMetaTool(client, 'list_campaigns', args);
  return extractContent(result);
}

export async function getCampaignDetails(
  client: Client,
  campaignId: string,
  datePreset: string = 'last_30d'
) {
  requireId(campaignId, 'campaignId');

  const result = await callMetaTool(client, 'get_campaign_details', {
    campaign_id: campaignId,
    date_preset: datePreset,
  });

  return extractContent(result);
}

export async function pauseCampaign(client: Client, campaignId: string) {
  requireId(campaignId, 'campaignId');

  const result = await callMetaTool(client, 'update_campaign', {
    campaign_id: campaignId,
    status: 'PAUSED',
  });

  return extractContent(result);
}

export async function resumeCampaign(client: Client, campaignId: string) {
  requireId(campaignId, 'campaignId');

  const result = await callMetaTool(client, 'update_campaign', {
    campaign_id: campaignId,
    status: 'ACTIVE',
  });

  return extractContent(result);
}

/**
 * Mantido por compatibilidade.
 * ATENÇÃO: orçamento normalmente é no AdSet, não na campanha.
 * Para atualizar orçamento real, prefira updateAdSetBudget().
 */
export async function updateCampaignBudget(
  client: Client,
  campaignId: string,
  dailyBudget: number
) {
  requireId(campaignId, 'campaignId');

  throw new Error(
    `updateCampaignBudget não deve atualizar daily_budget direto na campanha. 
Use listAdSets(client, campaignId), pegue o adset_id e chame updateAdSetBudget(client, adsetId, dailyBudget).`
  );
}

// ==============================
// Insights & Analytics
// ==============================

export async function getCampaignInsights(
  client: Client,
  campaignId: string,
  datePreset: string = 'last_7d'
) {
  requireId(campaignId, 'campaignId');

  const result = await callMetaTool(client, 'get_insights_for_campaign', {
    campaign_id: campaignId,
    date_preset: datePreset,
  });

  return extractContent(result);
}

export async function getAccountInsights(
  client: Client,
  datePreset: string = 'last_7d',
  accountId?: string
) {
  const args: Record<string, unknown> = {
    date_preset: datePreset,
  };

  if (accountId) args.ad_account_id = accountId;

  const result = await callMetaTool(client, 'get_insights_for_account', args);
  return extractContent(result);
}

export async function getAdAccounts(client: Client) {
  const result = await callMetaTool(client, 'list_ad_accounts');
  return extractContent(result);
}

export async function getPages(client: Client) {
  const result = await callMetaTool(client, 'list_pages');
  return extractContent(result);
}

// ==============================
// Ad Set Management
// ==============================

export async function listAdSets(client: Client, campaignId: string) {
  requireId(campaignId, 'campaignId');

  const result = await callMetaTool(client, 'list_adsets', {
    campaign_id: campaignId,
  });

  return extractContent(result);
}

export async function updateAdSetBudget(
  client: Client,
  adSetId: string,
  dailyBudget: number
) {
  requireId(adSetId, 'adSetId');

  const result = await callMetaTool(client, 'update_adset', {
    adset_id: adSetId,
    daily_budget: dailyBudget,
  });

  return extractContent(result);
}

export async function pauseAdSet(client: Client, adSetId: string) {
  requireId(adSetId, 'adSetId');

  const result = await callMetaTool(client, 'update_adset', {
    adset_id: adSetId,
    status: 'PAUSED',
  });

  return extractContent(result);
}

export async function resumeAdSet(client: Client, adSetId: string) {
  requireId(adSetId, 'adSetId');

  const result = await callMetaTool(client, 'update_adset', {
    adset_id: adSetId,
    status: 'ACTIVE',
  });

  return extractContent(result);
}

export interface AdSetDefaultCreative {
  page_id?: string;
  instagram_actor_id?: string;
  link?: string;
  cta?: string;
  is_whatsapp: boolean;
  whatsapp_link?: string;
  whatsapp_phone_number?: string;
  sample_primary_text?: string;
  sample_headline?: string;
  sample_description?: string;
}

interface AdSetDefaultCreativeApiResponse {
  ads?: {
    data?: Array<{
      creative?: {
        object_story_spec?: {
          page_id?: string;
          instagram_actor_id?: string;
          link_data?: {
            link?: string;
            message?: string;
            name?: string;
            description?: string;
            call_to_action?: { type?: string };
          };
        };
        asset_feed_spec?: {
          link_urls?: Array<{ website_url?: string }>;
          call_to_action_types?: string[];
          bodies?: Array<{ text?: string }>;
          titles?: Array<{ text?: string }>;
          descriptions?: Array<{ text?: string }>;
        };
      };
    }>;
  };
}

interface MetaPageSummary {
  id: string;
  instagram_business_account?: { id?: string };
}

/**
 * Extrai page_id/link/instagram_actor_id/cta do criativo de um anúncio já
 * existente no ad set, para pré-preencher a publicação de novos anúncios no
 * mesmo destino. Se o ad set ainda não tiver anúncios, cai no fallback de
 * usar a primeira página conectada à conta (mesmo padrão de campaigns/create).
 */
export async function getAdSetDefaultCreative(
  client: Client,
  adSetId: string
): Promise<AdSetDefaultCreative> {
  requireId(adSetId, 'adSetId');

  const result = await callMetaTool(client, 'get_adset_default_creative', { adset_id: adSetId });
  const data = extractContent(result) as AdSetDefaultCreativeApiResponse | null;

  const creative = data?.ads?.data?.[0]?.creative;
  const storySpec = creative?.object_story_spec;
  const assetFeed = creative?.asset_feed_spec;

  if (storySpec) {
    const linkData = storySpec.link_data;
    const ctaType = linkData?.call_to_action?.type;
    const isWhatsapp = ctaType === 'WHATSAPP_MESSAGE';

    return {
      page_id: storySpec.page_id || undefined,
      instagram_actor_id: storySpec.instagram_actor_id || undefined,
      link: linkData?.link || undefined,
      cta: ctaType,
      is_whatsapp: isWhatsapp,
      whatsapp_link: isWhatsapp ? linkData?.link || undefined : undefined,
      whatsapp_phone_number: undefined,
      sample_primary_text: linkData?.message || undefined,
      sample_headline: linkData?.name || undefined,
      sample_description: linkData?.description || undefined,
    };
  }

  if (assetFeed) {
    const ctaType = assetFeed.call_to_action_types?.[0];
    const isWhatsapp = ctaType === 'WHATSAPP_MESSAGE';
    const link = assetFeed.link_urls?.[0]?.website_url;

    return {
      page_id: undefined,
      instagram_actor_id: undefined,
      link,
      cta: ctaType,
      is_whatsapp: isWhatsapp,
      whatsapp_link: isWhatsapp ? link : undefined,
      whatsapp_phone_number: undefined,
      sample_primary_text: assetFeed.bodies?.[0]?.text || undefined,
      sample_headline: assetFeed.titles?.[0]?.text || undefined,
      sample_description: assetFeed.descriptions?.[0]?.text || undefined,
    };
  }

  // Fallback: nenhum anúncio existente — usa a primeira página da conta.
  const pages = (await getPages(client)) as MetaPageSummary[] | null;
  const firstPage = Array.isArray(pages) ? pages.find((p) => p?.id) : undefined;

  return {
    page_id: firstPage?.id,
    instagram_actor_id: firstPage?.instagram_business_account?.id,
    link: undefined,
    cta: undefined,
    is_whatsapp: false,
  };
}

// ==============================
// Campaign Creation
// ==============================

export async function createCampaign(
  client: Client,
  params: {
    name: string;
    objective: string;
    status?: string;
    ad_account_id?: string;
  }
) {
  const result = await callMetaTool(client, 'create_campaign', {
    name: params.name,
    objective: params.objective,
    status: params.status || 'PAUSED',
    ad_account_id: params.ad_account_id,
  });

  return extractContent(result);
}

export async function createAdSet(
  client: Client,
  params: {
    name: string;
    campaign_id: string;
    daily_budget: number;
    targeting: Record<string, unknown>;
    objective: string;
    optimization_goal?: string;
    billing_event?: string;
    status?: string;
    promoted_object?: Record<string, unknown>;
    destination_type?: string;
    bid_strategy?: string;
    bid_amount?: number;
    start_time?: string;
    end_time?: string;
    ad_account_id?: string;
  }
) {
  const bidCapParams: any = {};
  if (params.bid_strategy) bidCapParams['bid_strategy'] = params.bid_strategy;
  if (params.bid_amount) bidCapParams['bid_amount'] = params.bid_amount;

  const result = await callMetaTool(client, 'create_adset', {
    name: params.name,
    campaign_id: params.campaign_id,
    daily_budget: params.daily_budget,
    targeting: params.targeting,
    objective: params.objective,
    optimization_goal:
      params.optimization_goal ||
      getDefaultOptimizationGoal(params.objective, params.destination_type),
    billing_event: params.billing_event || getDefaultBillingEvent(params.objective),
    status: params.status || 'PAUSED',
    promoted_object: params.promoted_object,
    destination_type: params.destination_type,
    start_time: params.start_time,
    end_time: params.end_time,
    ad_account_id: params.ad_account_id,
    ...bidCapParams,
  });

  return extractContent(result);
}

export async function createAd(
  client: Client,
  params: {
    name: string;
    adset_id: string;
    creative_id: string;
    status?: string;
    ad_account_id?: string;
  }
) {
  const result = await callMetaTool(client, 'create_ad', {
    name: params.name,
    adset_id: params.adset_id,
    creative_id: params.creative_id,
    status: params.status || 'PAUSED',
    ad_account_id: params.ad_account_id,
  });

  return extractContent(result);
}

export async function createAdCreative(
  client: Client,
  params: {
    name: string;
    page_id: string;
    instagram_actor_id?: string;
    image_hash?: string;
    image_hashes?: string[];
    link: string;
    message: string;
    headline: string;
    description?: string;
    call_to_action_type?: string;
    ad_account_id?: string;
  }
) {
  const result = await callMetaTool(client, 'create_ad_creative', {
    name: params.name,
    page_id: params.page_id,
    instagram_actor_id: params.instagram_actor_id,
    image_hash: params.image_hash,
    image_hashes: params.image_hashes,
    link: params.link,
    message: params.message,
    headline: params.headline,
    description: params.description || '',
    call_to_action_type: params.call_to_action_type || 'LEARN_MORE',
    ad_account_id: params.ad_account_id,
  });

  return extractContent(result);
}

export async function createWhatsappAdCreative(
  client: Client,
  params: {
    name: string;
    page_id: string;
    instagram_actor_id?: string;
    image_hash?: string;
    image_hashes?: string[];
    message: string;
    headline: string;
    description?: string;
    link?: string;
    whatsapp_link?: string;
    whatsapp_phone_number?: string;
    ad_account_id?: string;
  }
) {
  const result = await callMetaTool(client, 'create_whatsapp_ad_creative', {
    name: params.name,
    page_id: params.page_id,
    instagram_actor_id: params.instagram_actor_id,
    image_hash: params.image_hash,
    image_hashes: params.image_hashes,
    message: params.message,
    headline: params.headline,
    description: params.description || '',
    link: params.link,
    whatsapp_link: params.whatsapp_link,
    whatsapp_phone_number: params.whatsapp_phone_number,
    ad_account_id: params.ad_account_id,
  });

  return extractContent(result);
}

export async function uploadAdImage(
  client: Client,
  imageUrl?: string,
  imageBytes?: string,
  adAccountId?: string
) {
  const params: Record<string, string> = {};

  if (imageUrl) params.image_url = imageUrl;
  if (imageBytes) params.image_bytes = imageBytes;
  if (adAccountId) params.ad_account_id = adAccountId;

  const result = await callMetaTool(client, 'upload_ad_image', params);
  return extractContent(result);
}

// ==============================
// Creative + Ad Pipeline (reusável: campanha nova ou ad set existente)
// ==============================

export interface AddAdToAdSetParams {
  adset_id: string;
  ad_name: string;
  page_id: string;
  instagram_actor_id?: string;
  image_urls?: string[];
  image_bytes?: string[];
  link: string;
  headline: string;
  primary_text: string;
  description: string;
  cta: string;
  ad_account_id?: string;

  is_whatsapp?: boolean;
  whatsapp_link?: string;
  whatsapp_phone_number?: string;
}

/**
 * Sobe imagens, cria o ad creative (normal ou whatsapp) e o anúncio dentro de
 * um ad set já existente. Usado tanto pelo pipeline de criação completa de
 * campanha quanto para adicionar novos anúncios a uma campanha ativa.
 */
export async function addAdToAdSet(client: Client, params: AddAdToAdSetParams) {
  const imageHashes: string[] = [];

  const DATA_URI_RE = /^data:image\/[a-zA-Z0-9.+-]+;base64,(.+)$/;

  const processImageUploads = async (urls?: string[], bytes?: string[]) => {
    const allBytes = [...(bytes || [])];
    const realUrls: string[] = [];

    // gpt-image-2 returns base64 data URIs (data:image/png;base64,...) — Meta's
    // upload_ad_image expects those as raw base64 via image_bytes, not image_url
    // (sending a data URI as image_url causes "tipo de arquivo não suportado").
    for (const url of urls || []) {
      const match = DATA_URI_RE.exec(url);
      if (match) {
        allBytes.push(match[1]);
      } else {
        realUrls.push(url);
      }
    }

    for (const url of realUrls) {
      const res = await uploadAdImage(client, url, undefined, params.ad_account_id);
      if ((res as any)?.hash) imageHashes.push((res as any).hash);
    }

    for (const b of allBytes) {
      const res = await uploadAdImage(client, undefined, b, params.ad_account_id);
      if ((res as any)?.hash) imageHashes.push((res as any).hash);
    }
  };

  await processImageUploads(params.image_urls, params.image_bytes);

  if (imageHashes.length === 0) {
    throw new Error('[Upload] Nenhuma imagem foi enviada ou processada.');
  }

  const creativeName = `${params.ad_name} — Creative`;

  // Use a single primary image via the standard object_story_spec path —
  // asset_feed_spec (Asset Customization / Dynamic Creative) requires the ad
  // set to be created with is_dynamic_creative=true, which we don't set here,
  // and combining it with degrees_of_freedom_spec triggers Meta error subcode
  // 2490433 ("unexpected error"). The first generated image (1080x1080) is
  // the most broadly compatible across placements.
  const primaryImageHash = imageHashes[0];

  // Monta o criativo com (ou sem) o Instagram. Quando a conta de anúncios não
  // tem permissão pra usar a conta de IG vinculada à página, a Meta recusa o
  // criativo inteiro (erro 200 / subcode 1815199). Nesse caso refazemos o
  // criativo só com o Facebook, em vez de barrar a publicação.
  const buildCreative = (instagramActorId?: string) => {
    if (params.is_whatsapp) {
      return createWhatsappAdCreative(client, {
        name: creativeName,
        page_id: params.page_id,
        instagram_actor_id: instagramActorId,
        image_hash: primaryImageHash,
        message: params.primary_text,
        headline: params.headline,
        description: params.description,
        link: params.link,
        whatsapp_link: params.whatsapp_link,
        whatsapp_phone_number: params.whatsapp_phone_number,
        ad_account_id: params.ad_account_id,
      });
    }
    return createAdCreative(client, {
      name: creativeName,
      page_id: params.page_id,
      instagram_actor_id: instagramActorId,
      image_hash: primaryImageHash,
      link: params.link,
      message: params.primary_text,
      headline: params.headline,
      description: params.description,
      call_to_action_type: params.cta,
      ad_account_id: params.ad_account_id,
    });
  };

  // 1815199: "A conta de anúncios não tem acesso a esta conta do Instagram".
  const isInstagramPermissionError = (err: unknown) =>
    err instanceof Error && /1815199/.test(err.message);

  let creative;
  let instagramDropped = false;
  try {
    creative = await buildCreative(params.instagram_actor_id);
  } catch (err) {
    if (params.instagram_actor_id && isInstagramPermissionError(err)) {
      creative = await buildCreative(undefined);
      instagramDropped = true;
    } else {
      throw err;
    }
  }

  const creativeId = (creative as any)?.id;
  if (!creativeId) {
    throw new Error(`[Creative] Falha no criativo: ${JSON.stringify(creative)}`);
  }

  const ad = await createAd(client, {
    name: `${params.ad_name} — Ad`,
    adset_id: params.adset_id,
    creative_id: creativeId,
    ad_account_id: params.ad_account_id,
  });

  const adId = (ad as any)?.id;
  if (!adId) {
    throw new Error(`[Ad] Falha no anúncio: ${JSON.stringify(ad)}`);
  }

  return {
    adset_id: params.adset_id,
    creative_id: creativeId,
    ad_id: adId,
    instagram_dropped: instagramDropped,
  };
}

// ==============================
// Full Campaign Creation Pipeline
// ==============================

export interface FullCampaignParams {
  campaign_name: string;
  objective: string;
  daily_budget: number;
  targeting: Record<string, unknown>;
  page_id: string;
  instagram_actor_id?: string;
  image_urls?: string[];
  image_bytes?: string[];
  link: string;
  headline: string;
  primary_text: string;
  description: string;
  cta: string;
  ad_account_id?: string;

  bid_strategy?: string;
  bid_amount?: number;

  optimization_goal?: string;
  billing_event?: string;
  destination_type?: string;
  promoted_object?: Record<string, unknown>;

  is_whatsapp?: boolean;
  whatsapp_link?: string;
  whatsapp_phone_number?: string;
}

export async function createFullCampaign(client: Client, params: FullCampaignParams) {
  // Step 1: Campaign
  const campaign = await createCampaign(client, {
    name: params.campaign_name,
    objective: params.objective,
    ad_account_id: params.ad_account_id,
  });

  const campaignId = (campaign as any)?.id;

  if (!campaignId) {
    throw new Error(`[Step 1 - Campaign] Falha: ${JSON.stringify(campaign)}`);
  }

  // Step 2: Ad Set
  const destinationType = params.destination_type || (params.is_whatsapp ? 'WHATSAPP' : undefined);

  let promotedObject = params.promoted_object;

  if (!promotedObject && params.is_whatsapp) {
    promotedObject = {
      page_id: params.page_id,
    };
  }

  const optimizationGoal =
    params.optimization_goal ||
    getDefaultOptimizationGoal(params.objective, destinationType);

  const billingEvent =
    params.billing_event ||
    getDefaultBillingEvent(params.objective);

  const adSet = await createAdSet(client, {
    name: `${params.campaign_name} — Ad Set`,
    campaign_id: campaignId,
    daily_budget: params.daily_budget,
    targeting: params.targeting,
    objective: params.objective,
    optimization_goal: optimizationGoal,
    billing_event: billingEvent,
    promoted_object: promotedObject,
    destination_type: destinationType,
    bid_strategy: params.bid_strategy,
    bid_amount: params.bid_amount,
    ad_account_id: params.ad_account_id,
  });

  const adSetId = (adSet as any)?.id;

  if (!adSetId) {
    throw new Error(`[Step 2 - Ad Set] Falha: ${JSON.stringify(adSet)}`);
  }

  // Steps 3-5: Image Upload + Ad Creative + Ad (pipeline compartilhado)
  const { creative_id: creativeId, ad_id: adId } = await addAdToAdSet(client, {
    adset_id: adSetId,
    ad_name: params.campaign_name,
    page_id: params.page_id,
    instagram_actor_id: params.instagram_actor_id,
    image_urls: params.image_urls,
    image_bytes: params.image_bytes,
    link: params.link,
    headline: params.headline,
    primary_text: params.primary_text,
    description: params.description,
    cta: params.cta,
    ad_account_id: params.ad_account_id,
    is_whatsapp: params.is_whatsapp,
    whatsapp_link: params.whatsapp_link,
    whatsapp_phone_number: params.whatsapp_phone_number,
  });

  return {
    campaign_id: campaignId,
    adset_id: adSetId,
    creative_ids: [creativeId],
    ad_ids: [adId],
    objective: params.objective,
    optimization_goal: optimizationGoal,
    billing_event: billingEvent,
    bid_strategy: params.bid_strategy,
    bid_amount: params.bid_amount,
    is_whatsapp: params.is_whatsapp || false,
  };
}