import { validateExternalAuth } from "../_shared/auth.ts";
import { getExternalAppointments } from "../_shared/external.ts";

const corsHeaders = {
  "Access-Control-Allow-Origin": "*",
  "Access-Control-Allow-Headers":
    "authorization, x-client-info, apikey, content-type",
};

Deno.serve(async (req) => {
  if (req.method === "OPTIONS")
    return new Response("ok", { headers: corsHeaders });

  try {
    const { user, ownSupabase } = await validateExternalAuth(req);
    const supabase = ownSupabase;
    const externalJwt = req.headers.get("x-external-jwt")!;

    const { doctor_id, date_from, date_to } = await req.json();

    // 1. Verificar se existe cache válido no NOSSO Supabase
    const cacheKey = `heatmap_${doctor_id || "all"}_${date_from}_${date_to}`;
    const { data: cachedData } = await supabase
      .from("analytics_cache")
      .select("*")
      .eq("cache_key", cacheKey)
      .gte("expires_at", new Date().toISOString())
      .single();

    if (cachedData) {
      return new Response(
        JSON.stringify({ success: true, data: cachedData.data, cached: true }),
        { headers: { ...corsHeaders, "Content-Type": "application/json" } }
      );
    }

    // 2. Buscar appointments do Supabase EXTERNO
    const appointments = await getExternalAppointments(
      { doctor_id },
      `Bearer ${externalJwt}`
    );

    // 3. Processar heatmap (dia da semana x hora)
    const heatmap: Record<string, Record<string, number>> = {};
    const days = [
      "Sunday",
      "Monday",
      "Tuesday",
      "Wednesday",
      "Thursday",
      "Friday",
      "Saturday",
    ];

    appointments.forEach((apt: any) => {
      // scheduled_at é timestamp ISO 8601 (ex: "2025-11-27T14:30:00")
      const date = new Date(apt.scheduled_at);
      const dayName = days[date.getDay()];
      const hour = date.getHours();

      if (!heatmap[dayName]) heatmap[dayName] = {};
      if (!heatmap[dayName][hour]) heatmap[dayName][hour] = 0;
      heatmap[dayName][hour]++;
    });

    // 4. Salvar no cache (expira em 1 hora)
    const expiresAt = new Date();
    expiresAt.setHours(expiresAt.getHours() + 1);

    await supabase.from("analytics_cache").upsert({
      cache_key: cacheKey,
      data: heatmap,
      expires_at: expiresAt.toISOString(),
      created_at: new Date().toISOString(),
    });

    return new Response(
      JSON.stringify({ success: true, data: heatmap, cached: false }),
      { headers: { ...corsHeaders, "Content-Type": "application/json" } }
    );
  } catch (error: any) {
    return new Response(
      JSON.stringify({ success: false, error: error.message }),
      {
        status: 400,
        headers: { ...corsHeaders, "Content-Type": "application/json" },
      }
    );
  }
});