/** GA4 + Search Console discover & sync using agency Google OAuth (marketing@). */

import { serviceHeaders, supabaseUrl } from '@/lib/agency';
import { getValidAccessToken } from '@/lib/google-drive';

export type Ga4Property = {
  propertyId: string; // properties/123
  displayName: string;
  accountName: string;
  measurementId: string | null; // G-XXXX
};

export type GscSite = {
  siteUrl: string;
  permissionLevel: string;
};

function n(v: unknown): number {
  const x = Number(v);
  return Number.isFinite(x) ? x : 0;
}

export async function listGa4Properties(): Promise<Ga4Property[]> {
  const token = await getValidAccessToken();
  const out: Ga4Property[] = [];
  let pageToken: string | undefined;

  do {
    const url = new URL(
      'https://analyticsadmin.googleapis.com/v1beta/accountSummaries'
    );
    url.searchParams.set('pageSize', '200');
    if (pageToken) url.searchParams.set('pageToken', pageToken);

    const r = await fetch(url.toString(), {
      headers: { Authorization: `Bearer ${token}` },
      cache: 'no-store',
    });
    if (!r.ok) {
      throw new Error(`GA4 Admin: ${(await r.text()).slice(0, 300)}`);
    }
    const j = (await r.json()) as {
      accountSummaries?: {
        displayName?: string;
        propertySummaries?: { property?: string; displayName?: string }[];
      }[];
      nextPageToken?: string;
    };

    for (const acc of j.accountSummaries || []) {
      for (const p of acc.propertySummaries || []) {
        if (!p.property) continue;
        const measurementId = await fetchMeasurementId(token, p.property);
        out.push({
          propertyId: p.property,
          displayName: p.displayName || p.property,
          accountName: acc.displayName || '',
          measurementId,
        });
      }
    }
    pageToken = j.nextPageToken;
  } while (pageToken);

  return out;
}

async function fetchMeasurementId(
  token: string,
  propertyResource: string
): Promise<string | null> {
  // propertyResource = "properties/123456"
  const r = await fetch(
    `https://analyticsadmin.googleapis.com/v1beta/${propertyResource}/dataStreams`,
    {
      headers: { Authorization: `Bearer ${token}` },
      cache: 'no-store',
    }
  );
  if (!r.ok) return null;
  const j = (await r.json()) as {
    dataStreams?: {
      webStreamData?: { measurementId?: string };
      type?: string;
    }[];
  };
  for (const s of j.dataStreams || []) {
    const mid = s.webStreamData?.measurementId;
    if (mid) return mid;
  }
  return null;
}

export async function listGscSites(): Promise<GscSite[]> {
  const token = await getValidAccessToken();
  const r = await fetch('https://www.googleapis.com/webmasters/v3/sites', {
    headers: { Authorization: `Bearer ${token}` },
    cache: 'no-store',
  });
  if (!r.ok) {
    throw new Error(`GSC: ${(await r.text()).slice(0, 300)}`);
  }
  const j = (await r.json()) as {
    siteEntry?: { siteUrl?: string; permissionLevel?: string }[];
  };
  return (j.siteEntry || [])
    .filter((s) => s.siteUrl)
    .map((s) => ({
      siteUrl: s.siteUrl!,
      permissionLevel: s.permissionLevel || '',
    }));
}

function normName(s: string): string {
  return s
    .toLowerCase()
    .normalize('NFD')
    .replace(/[\u0300-\u036f]/g, '')
    .replace(/[^a-z0-9]+/g, ' ')
    .trim();
}

function scoreNames(a: string, b: string): number {
  const x = normName(a);
  const y = normName(b);
  if (!x || !y) return 0;
  if (x === y) return 100;
  if (x.includes(y) || y.includes(x)) return 80;
  const xt = new Set(x.split(' ').filter(Boolean));
  const yt = new Set(y.split(' ').filter(Boolean));
  let hit = 0;
  for (const t of xt) if (yt.has(t)) hit += 1;
  if (!xt.size || !yt.size) return 0;
  return Math.round((100 * hit) / Math.max(xt.size, yt.size));
}

export type OrganicMatch = {
  tenantId: string;
  tenantName: string;
  tenantSlug: string;
  ga4?: {
    propertyId: string;
    measurementId: string | null;
    displayName: string;
    score: number;
  } | null;
  gsc?: { siteUrl: string; score: number } | null;
};

export async function matchOrganicToTenants(
  tenants: { id: string; name: string; slug: string }[],
  ga4: Ga4Property[],
  gsc: GscSite[]
): Promise<OrganicMatch[]> {
  return tenants.map((t) => {
    let bestGa: OrganicMatch['ga4'] = null;
    for (const p of ga4) {
      const s = Math.max(
        scoreNames(t.name, p.displayName),
        scoreNames(t.slug, p.displayName),
        scoreNames(t.name, p.accountName)
      );
      if (!bestGa || s > bestGa.score) {
        bestGa = {
          propertyId: p.propertyId,
          measurementId: p.measurementId,
          displayName: p.displayName,
          score: s,
        };
      }
    }
    if (bestGa && bestGa.score < 50) bestGa = null;

    let bestGsc: OrganicMatch['gsc'] = null;
    for (const s of gsc) {
      const url = s.siteUrl.replace(/^sc-domain:/, '').replace(/\/$/, '');
      const score = Math.max(
        scoreNames(t.name, url),
        scoreNames(t.slug, url),
        scoreNames(t.name, s.siteUrl)
      );
      if (!bestGsc || score > bestGsc.score) {
        bestGsc = { siteUrl: s.siteUrl, score };
      }
    }
    if (bestGsc && bestGsc.score < 40) bestGsc = null;

    return {
      tenantId: t.id,
      tenantName: t.name,
      tenantSlug: t.slug,
      ga4: bestGa,
      gsc: bestGsc,
    };
  });
}

/** Apply matches → integrations ga4 / search_console connected. */
export async function applyOrganicMatches(
  matches: OrganicMatch[]
): Promise<{ ga4: number; gsc: number }> {
  const headers = serviceHeaders();
  if (!headers) throw new Error('no service role');
  let ga4 = 0;
  let gsc = 0;
  const base = supabaseUrl();

  for (const m of matches) {
    if (m.ga4) {
      const accountId = m.ga4.measurementId || m.ga4.propertyId;
      const ok = await upsertIntegration(base, headers, m.tenantId, 'ga4', {
        status: 'connected',
        external_account_id: accountId,
        label: m.ga4.displayName,
        meta: {
          property_id: m.ga4.propertyId,
          measurement_id: m.ga4.measurementId,
          matched_at: new Date().toISOString(),
        },
        // last_sync_at solo tras volcar organic_daily (no al emparejar)
        error_message: null,
      });
      if (ok) ga4 += 1;
    }
    if (m.gsc) {
      const ok = await upsertIntegration(
        base,
        headers,
        m.tenantId,
        'search_console',
        {
          status: 'connected',
          external_account_id: m.gsc.siteUrl,
          label: m.gsc.siteUrl,
          meta: {
            site_url: m.gsc.siteUrl,
            matched_at: new Date().toISOString(),
          },
          error_message: null,
        }
      );
      if (ok) gsc += 1;
    }
  }
  return { ga4, gsc };
}

async function upsertIntegration(
  base: string,
  headers: { apikey: string; Authorization: string },
  tenantId: string,
  provider: string,
  patch: Record<string, unknown>
): Promise<boolean> {
  const r = await fetch(
    `${base}/rest/v1/integrations?tenant_id=eq.${encodeURIComponent(tenantId)}&provider=eq.${provider}`,
    {
      method: 'PATCH',
      headers: {
        ...headers,
        'Content-Type': 'application/json',
        Prefer: 'return=minimal',
      },
      body: JSON.stringify(patch),
    }
  );
  if (r.ok) return true;
  const ins = await fetch(`${base}/rest/v1/integrations`, {
    method: 'POST',
    headers: {
      ...headers,
      'Content-Type': 'application/json',
      Prefer: 'resolution=merge-duplicates',
    },
    body: JSON.stringify({
      tenant_id: tenantId,
      provider,
      enabled: true,
      ...patch,
    }),
  });
  return ins.ok;
}

function isoDay(d: Date): string {
  return d.toISOString().slice(0, 10);
}

export async function fetchGscTopRows(opts: {
  siteUrl: string;
  startDate: string;
  endDate: string;
  dimension: 'query' | 'page';
  rowLimit?: number;
}): Promise<
  { key: string; clicks: number; impressions: number; ctr: number; position: number }[]
> {
  const token = await getValidAccessToken();
  const site = encodeURIComponent(opts.siteUrl);
  const r = await fetch(
    `https://www.googleapis.com/webmasters/v3/sites/${site}/searchAnalytics/query`,
    {
      method: 'POST',
      headers: {
        Authorization: `Bearer ${token}`,
        'Content-Type': 'application/json',
      },
      body: JSON.stringify({
        startDate: opts.startDate,
        endDate: opts.endDate,
        dimensions: [opts.dimension],
        rowLimit: opts.rowLimit ?? 25,
      }),
    }
  );
  if (!r.ok) throw new Error(`GSC ${opts.dimension}: ${(await r.text()).slice(0, 160)}`);
  const j = (await r.json()) as {
    rows?: {
      keys?: string[];
      clicks?: number;
      impressions?: number;
      ctr?: number;
      position?: number;
    }[];
  };
  return (j.rows || []).map((row) => ({
    key: row.keys?.[0] || '',
    clicks: n(row.clicks),
    impressions: n(row.impressions),
    ctr: row.ctr != null ? Math.round(n(row.ctr) * 10000) / 100 : 0,
    position: row.position != null ? Math.round(n(row.position) * 10) / 10 : 0,
  }));
}

export async function fetchGa4TopLandings(opts: {
  propertyId: string;
  startDate: string;
  endDate: string;
  rowLimit?: number;
}): Promise<{ page: string; sessions: number; users: number }[]> {
  const token = await getValidAccessToken();
  const prop = opts.propertyId.replace(/^properties\//, '');
  const r = await fetch(
    `https://analyticsdata.googleapis.com/v1beta/properties/${prop}:runReport`,
    {
      method: 'POST',
      headers: {
        Authorization: `Bearer ${token}`,
        'Content-Type': 'application/json',
      },
      body: JSON.stringify({
        dateRanges: [{ startDate: opts.startDate, endDate: opts.endDate }],
        dimensions: [{ name: 'landingPagePlusQueryString' }],
        metrics: [{ name: 'sessions' }, { name: 'totalUsers' }],
        dimensionFilter: {
          filter: {
            fieldName: 'sessionDefaultChannelGroup',
            stringFilter: { value: 'Organic Search' },
          },
        },
        orderBys: [{ metric: { metricName: 'sessions' }, desc: true }],
        limit: opts.rowLimit ?? 20,
      }),
    }
  );
  if (!r.ok) throw new Error(`GA4 landings: ${(await r.text()).slice(0, 160)}`);
  const j = (await r.json()) as {
    rows?: {
      dimensionValues?: { value?: string }[];
      metricValues?: { value?: string }[];
    }[];
  };
  return (j.rows || []).map((row) => ({
    page: row.dimensionValues?.[0]?.value || '/',
    sessions: n(row.metricValues?.[0]?.value),
    users: n(row.metricValues?.[1]?.value),
  }));
}

/** Sync last N days of GSC + GA4 into organic_daily for one tenant. */
export async function syncOrganicTenant(opts: {
  tenantId: string;
  ga4PropertyId?: string | null; // properties/123
  gscSiteUrl?: string | null;
  days?: number;
}): Promise<{ daysWritten: number; warning?: string }> {
  const headers = serviceHeaders();
  if (!headers) throw new Error('no service role');
  const days = opts.days ?? 28;
  const token = await getValidAccessToken();

  const until = new Date();
  until.setUTCDate(until.getUTCDate() - 1); // yesterday
  const since = new Date(until);
  since.setUTCDate(since.getUTCDate() - (days - 1));
  const start = isoDay(since);
  const end = isoDay(until);

  const byDay = new Map<
    string,
    {
      gsc_clicks: number;
      gsc_impressions: number;
      gsc_ctr: number | null;
      gsc_avg_position: number | null;
      ga4_sessions: number;
      ga4_users: number;
      ga4_organic_sessions: number;
      ga4_conversions: number;
    }
  >();

  function ensure(day: string) {
    if (!byDay.has(day)) {
      byDay.set(day, {
        gsc_clicks: 0,
        gsc_impressions: 0,
        gsc_ctr: null,
        gsc_avg_position: null,
        ga4_sessions: 0,
        ga4_users: 0,
        ga4_organic_sessions: 0,
        ga4_conversions: 0,
      });
    }
    return byDay.get(day)!;
  }

  const warnings: string[] = [];

  if (opts.gscSiteUrl) {
    try {
      const site = encodeURIComponent(opts.gscSiteUrl);
      const r = await fetch(
        `https://www.googleapis.com/webmasters/v3/sites/${site}/searchAnalytics/query`,
        {
          method: 'POST',
          headers: {
            Authorization: `Bearer ${token}`,
            'Content-Type': 'application/json',
          },
          body: JSON.stringify({
            startDate: start,
            endDate: end,
            dimensions: ['date'],
            rowLimit: 1000,
          }),
        }
      );
      if (!r.ok) {
        warnings.push(`GSC ${(await r.text()).slice(0, 120)}`);
      } else {
        const j = (await r.json()) as {
          rows?: {
            keys?: string[];
            clicks?: number;
            impressions?: number;
            ctr?: number;
            position?: number;
          }[];
        };
        for (const row of j.rows || []) {
          const day = (row.keys?.[0] || '').slice(0, 10);
          if (!day) continue;
          const cur = ensure(day);
          cur.gsc_clicks = n(row.clicks);
          cur.gsc_impressions = n(row.impressions);
          cur.gsc_ctr =
            row.ctr != null ? Math.round(n(row.ctr) * 10000) / 100 : null;
          cur.gsc_avg_position =
            row.position != null ? Math.round(n(row.position) * 10) / 10 : null;
        }
      }
    } catch (e) {
      warnings.push(e instanceof Error ? e.message : 'gsc error');
    }
  }

  if (opts.ga4PropertyId) {
    try {
      const prop = opts.ga4PropertyId.replace(/^properties\//, '');
      // Totals by day
      const r = await fetch(
        `https://analyticsdata.googleapis.com/v1beta/properties/${prop}:runReport`,
        {
          method: 'POST',
          headers: {
            Authorization: `Bearer ${token}`,
            'Content-Type': 'application/json',
          },
          body: JSON.stringify({
            dateRanges: [{ startDate: start, endDate: end }],
            dimensions: [{ name: 'date' }],
            metrics: [
              { name: 'sessions' },
              { name: 'totalUsers' },
              { name: 'conversions' },
            ],
          }),
        }
      );
      if (!r.ok) {
        warnings.push(`GA4 ${(await r.text()).slice(0, 120)}`);
      } else {
        const j = (await r.json()) as {
          rows?: {
            dimensionValues?: { value?: string }[];
            metricValues?: { value?: string }[];
          }[];
        };
        for (const row of j.rows || []) {
          const raw = row.dimensionValues?.[0]?.value || '';
          // GA4 date = YYYYMMDD
          const day =
            raw.length === 8
              ? `${raw.slice(0, 4)}-${raw.slice(4, 6)}-${raw.slice(6, 8)}`
              : raw.slice(0, 10);
          if (!day) continue;
          const cur = ensure(day);
          cur.ga4_sessions = n(row.metricValues?.[0]?.value);
          cur.ga4_users = n(row.metricValues?.[1]?.value);
          cur.ga4_conversions = n(row.metricValues?.[2]?.value);
        }
      }

      // Organic sessions by day
      const r2 = await fetch(
        `https://analyticsdata.googleapis.com/v1beta/properties/${prop}:runReport`,
        {
          method: 'POST',
          headers: {
            Authorization: `Bearer ${token}`,
            'Content-Type': 'application/json',
          },
          body: JSON.stringify({
            dateRanges: [{ startDate: start, endDate: end }],
            dimensions: [{ name: 'date' }, { name: 'sessionDefaultChannelGroup' }],
            metrics: [{ name: 'sessions' }],
            dimensionFilter: {
              filter: {
                fieldName: 'sessionDefaultChannelGroup',
                stringFilter: { value: 'Organic Search' },
              },
            },
          }),
        }
      );
      if (r2.ok) {
        const j = (await r2.json()) as {
          rows?: {
            dimensionValues?: { value?: string }[];
            metricValues?: { value?: string }[];
          }[];
        };
        for (const row of j.rows || []) {
          const raw = row.dimensionValues?.[0]?.value || '';
          const day =
            raw.length === 8
              ? `${raw.slice(0, 4)}-${raw.slice(4, 6)}-${raw.slice(6, 8)}`
              : raw.slice(0, 10);
          if (!day) continue;
          ensure(day).ga4_organic_sessions = n(row.metricValues?.[0]?.value);
        }
      }
    } catch (e) {
      warnings.push(e instanceof Error ? e.message : 'ga4 error');
    }
  }

  const rows = [...byDay.entries()].map(([day, v]) => ({
    tenant_id: opts.tenantId,
    day,
    ...v,
    source: 'sync',
  }));

  if (!rows.length) {
    return {
      daysWritten: 0,
      warning: warnings[0] || 'Sin filas GA4/GSC en el periodo',
    };
  }

  const upsert = await fetch(
    `${supabaseUrl()}/rest/v1/organic_daily?on_conflict=tenant_id,day`,
    {
      method: 'POST',
      headers: {
        ...headers,
        'Content-Type': 'application/json',
        Prefer: 'resolution=merge-duplicates,return=minimal',
      },
      body: JSON.stringify(rows),
    }
  );
  if (!upsert.ok) {
    const msg = await upsert.text();
    throw new Error(
      msg.includes('organic_daily')
        ? 'Aplicar sql/organic_geo.sql'
        : msg.slice(0, 300)
    );
  }

  return {
    daysWritten: rows.length,
    warning: warnings[0],
  };
}

type IntegRow = {
  tenant_id: string;
  provider: string;
  external_account_id?: string;
  meta?: { property_id?: string; measurement_id?: string; site_url?: string };
  last_sync_at?: string | null;
};

/** Sync all (or one) tenants with connected GA4/GSC. Rolling window ending yesterday. */
export async function syncAllConnectedOrganic(opts?: {
  tenantId?: string | null;
  /** Days ending yesterday (default 28; daily cron can use 3–7). */
  days?: number;
}): Promise<{
  synced: number;
  results: { tenantId: string; daysWritten: number; warning?: string }[];
}> {
  const headers = serviceHeaders();
  if (!headers) throw new Error('no service role');
  const days = Math.min(90, Math.max(3, opts?.days ?? 28));
  const tenantFilter = opts?.tenantId?.trim() || '';

  const iRes = await fetch(
    `${supabaseUrl()}/rest/v1/integrations?provider=in.(ga4,search_console)&status=eq.connected&select=tenant_id,provider,external_account_id,meta,last_sync_at`,
    { headers, cache: 'no-store' }
  );
  if (!iRes.ok) throw new Error((await iRes.text()).slice(0, 200));
  const integs = (await iRes.json()) as IntegRow[];

  const byTenant = new Map<
    string,
    { ga4PropertyId?: string; gscSiteUrl?: string; measurementId?: string }
  >();
  for (const i of integs) {
    if (tenantFilter && i.tenant_id !== tenantFilter) continue;
    const cur = byTenant.get(i.tenant_id) || {};
    if (i.provider === 'ga4') {
      cur.ga4PropertyId =
        i.meta?.property_id ||
        (i.external_account_id?.startsWith('properties/')
          ? i.external_account_id
          : undefined);
      if (i.external_account_id?.startsWith('G-')) {
        cur.measurementId = i.external_account_id;
      }
      cur.measurementId = cur.measurementId || i.meta?.measurement_id || undefined;
    }
    if (i.provider === 'search_console') {
      cur.gscSiteUrl = i.meta?.site_url || i.external_account_id || undefined;
    }
    byTenant.set(i.tenant_id, cur);
  }

  let ga4Catalog: Ga4Property[] | null = null;
  const results: {
    tenantId: string;
    daysWritten: number;
    warning?: string;
  }[] = [];

  for (const [tenantId, cfg] of byTenant) {
    let propId = cfg.ga4PropertyId;
    if (!propId && cfg.measurementId?.startsWith('G-')) {
      if (!ga4Catalog) {
        try {
          ga4Catalog = await listGa4Properties();
        } catch {
          ga4Catalog = [];
        }
      }
      const hit = ga4Catalog.find((p) => p.measurementId === cfg.measurementId);
      propId = hit?.propertyId;
    }
    if (!propId && !cfg.gscSiteUrl) continue;
    try {
      const r = await syncOrganicTenant({
        tenantId,
        ga4PropertyId: propId,
        gscSiteUrl: cfg.gscSiteUrl,
        days,
      });
      // Solo marcar last_sync_at si hubo filas (no mentir tras match vacío)
      if (r.daysWritten > 0) {
        await fetch(
          `${supabaseUrl()}/rest/v1/integrations?tenant_id=eq.${encodeURIComponent(tenantId)}&provider=in.(ga4,search_console)`,
          {
            method: 'PATCH',
            headers: {
              ...headers,
              'Content-Type': 'application/json',
              Prefer: 'return=minimal',
            },
            body: JSON.stringify({ last_sync_at: new Date().toISOString() }),
          }
        );
      }
      results.push({ tenantId, ...r });
    } catch (e) {
      results.push({
        tenantId,
        daysWritten: 0,
        warning: e instanceof Error ? e.message : 'sync error',
      });
    }
  }

  return {
    synced: results.filter((r) => r.daysWritten > 0).length,
    results,
  };
}

/** True if we should refresh this tenant (no yesterday row or sync older than maxAgeMs). */
export async function organicNeedsRefresh(
  tenantId: string,
  maxAgeMs = 6 * 60 * 60 * 1000
): Promise<boolean> {
  const headers = serviceHeaders();
  if (!headers) return false;
  const yesterday = new Date();
  yesterday.setUTCDate(yesterday.getUTCDate() - 1);
  const y = yesterday.toISOString().slice(0, 10);

  const [od, ig] = await Promise.all([
    fetch(
      `${supabaseUrl()}/rest/v1/organic_daily?tenant_id=eq.${encodeURIComponent(tenantId)}&day=eq.${y}&select=day&limit=1`,
      { headers, cache: 'no-store' }
    ),
    fetch(
      `${supabaseUrl()}/rest/v1/integrations?tenant_id=eq.${encodeURIComponent(tenantId)}&provider=in.(ga4,search_console)&status=eq.connected&select=last_sync_at&limit=2`,
      { headers, cache: 'no-store' }
    ),
  ]);
  if (od.ok) {
    const rows = await od.json();
    if (!rows.length) return true;
  }
  if (ig.ok) {
    const rows = (await ig.json()) as { last_sync_at?: string }[];
    if (!rows.length) return false; // nothing connected
    const latest = rows
      .map((r) => (r.last_sync_at ? new Date(r.last_sync_at).getTime() : 0))
      .reduce((a, b) => Math.max(a, b), 0);
    if (!latest || Date.now() - latest > maxAgeMs) return true;
  }
  return false;
}