// Follow this setup guide to integrate the Deno language server with your editor:
// https://deno.land/manual/getting_started/setup_your_environment
// This enables autocomplete, go to definition, etc.

// Setup type definitions for built-in Supabase Runtime APIs
import "@supabase/functions-js/edge-runtime.d.ts";
import { createClient } from "@supabase/supabase-js";
import { z } from "zod";
import { corsHeaders } from "../_shared/cors.ts";
import type { Database } from "../_shared/database.types.ts";
import { HttpError, sendError } from "../_shared/utils.ts";
import { handleDownloadReportAction } from "./download-report.ts";

const ActionSchema = z.object({
  action: z.string().min(1),
});

function getAuthHeader(req: Request): string | null {
  return req.headers.get("Authorization") ?? req.headers.get("authorization");
}

Deno.serve(async (req: Request): Promise<Response> => {
  const url = new URL(req.url);
  const functionName = url.pathname.split("/").pop();
  console.log(
    `[${new Date().toISOString()}][${functionName}]: Request received`,
  );

  if (req.method === "OPTIONS") {
    return new Response(null, { status: 204, headers: corsHeaders });
  }

  try {
    if (req.method !== "POST") {
      throw new HttpError(
        405,
        "Método no permitido.",
        "METHOD_NOT_ALLOWED",
        { method: req.method },
      );
    }

    const authHeader = getAuthHeader(req);
    if (!authHeader) {
      throw new HttpError(401, "No autorizado.", "UNAUTHORIZED", {
        reason: "missing_authorization_header",
      });
    }

    const contentType = (req.headers.get("content-type") || "").toLowerCase();
    if (!contentType.startsWith("application/json")) {
      throw new HttpError(
        415,
        "Content-Type no soportado.",
        "UNSUPPORTED_MEDIA_TYPE",
        { contentType },
      );
    }

    const SUPABASE_URL = Deno.env.get("SUPABASE_URL");
    const SERVICE_ROLE_KEY = Deno.env.get("SUPABASE_SERVICE_ROLE_KEY");
    if (!SUPABASE_URL || !SERVICE_ROLE_KEY) {
      throw new HttpError(
        500,
        "Configuración del servidor incompleta.",
        "MISSING_ENV",
        {
          missing: [
            !SUPABASE_URL ? "SUPABASE_URL" : null,
            !SERVICE_ROLE_KEY ? "SUPABASE_SERVICE_ROLE_KEY" : null,
          ].filter(Boolean),
        },
      );
    }

    const CARBONE_API_TOKEN = Deno.env.get("CARBONE_API_TOKEN");
    const CARBONE_BASE_URL = Deno.env.get("CARBONE_BASE_URL") ||
      "https://carbone.lci.ulsa.mx";
    if (!CARBONE_API_TOKEN) {
      throw new HttpError(
        500,
        "Configuración del servidor incompleta.",
        "MISSING_ENV",
        {
          missing: [
            !CARBONE_API_TOKEN ? "CARBONE_API_TOKEN" : null,
          ].filter(Boolean),
        },
      );
    }

    const bodyUnknown: unknown = await req.json();
    const { action } = ActionSchema.parse(bodyUnknown);

    const supabase = createClient<Database>(SUPABASE_URL, SERVICE_ROLE_KEY, {
      auth: { persistSession: false },
    });

    switch (action) {
      case "downloadReport": {
        const response = await handleDownloadReportAction({
          bodyUnknown,
          supabase,
          carboneBaseUrl: CARBONE_BASE_URL,
          carboneApiToken: CARBONE_API_TOKEN,
        });

        console.log(
          `[${
            new Date().toISOString()
          }][${functionName}]: Request processed successfully`,
        );

        return response;
      }
      default:
        throw new HttpError(
          400,
          "Acción no soportada.",
          "UNSUPPORTED_ACTION",
          { action },
        );
    }
  } catch (error) {
    if (error instanceof HttpError) {
      console.error(
        `[${new Date().toISOString()}][${functionName}] ⚠️ Handled Error:`,
        {
          message: error.message,
          code: error.code,
          internalDetails: error.internalDetails || "N/A",
        },
      );

      return sendError(error.status, error.message, error.code);
    }

    const unexpectedError = error instanceof Error
      ? error
      : new Error(String(error));

    console.error(
      `[${
        new Date().toISOString()
      }][${functionName}] 💥 CRITICAL UNHANDLED ERROR:`,
      unexpectedError.stack || unexpectedError.message,
    );

    return sendError(
      500,
      "Ocurrió un error inesperado en el servidor.",
      "INTERNAL_SERVER_ERROR",
    );
  }
});

/* To invoke locally:

  1. Run `supabase start` (see: https://supabase.com/docs/reference/cli/supabase-start)
  2. Make an HTTP request:

  # Requires secrets:
  # - CARBONE_API_TOKEN
  # Optional:
  # - CARBONE_BASE_URL (defaults to https://carbone.lci.ulsa.mx)

  curl -i --location --request POST 'http://127.0.0.1:54321/functions/v1/carbone-io-wrapper' \
    --header 'Authorization: Bearer <JWT>' \
    --header 'Content-Type: application/json' \
    --data '{"action":"downloadReport","plan_estudio_id":"<uuid>","body":{}}'

  # Or for asignaturas (must include body.data):

  curl -i --location --request POST 'http://127.0.0.1:54321/functions/v1/carbone-io-wrapper' \
    --header 'Authorization: Bearer <JWT>' \
    --header 'Content-Type: application/json' \
    --data '{"action":"downloadReport","asignatura_id":"<uuid>","body":{"data":{}}}'

*/