/**
 * Netlify Function: Doctors CRUD
 * GET /rest/v1/doctors - Lista médicos
 * GET /rest/v1/doctors/{id} - Busca por ID
 * POST /rest/v1/doctors - Cria médico
 * PATCH /rest/v1/doctors/{id} - Atualiza médico
 * DELETE /rest/v1/doctors/{id} - Deleta médico
 */

import type { Handler, HandlerEvent } from "@netlify/functions";

const SUPABASE_URL = "https://yuanqfswhberkoevtmfr.supabase.co";
const SUPABASE_ANON_KEY =
  "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJzdXBhYmFzZSIsInJlZiI6Inl1YW5xZnN3aGJlcmtvZXZ0bWZyIiwicm9sZSI6ImFub24iLCJpYXQiOjE3NTQ5NTQzNjksImV4cCI6MjA3MDUzMDM2OX0.g8Fm4XAvtX46zifBZnYVH4tVuQkqUH6Ia9CXQj4DztQ";

export const handler: Handler = async (event: HandlerEvent) => {
  const headers = {
    "Access-Control-Allow-Origin": "*",
    "Access-Control-Allow-Headers": "Content-Type, Authorization",
    "Access-Control-Allow-Methods": "GET, POST, PATCH, DELETE, OPTIONS",
  };

  if (event.httpMethod === "OPTIONS") {
    return {
      statusCode: 200,
      headers,
      body: "",
    };
  }

  try {
    const authHeader =
      event.headers.authorization || event.headers.Authorization;

    if (!authHeader) {
      return {
        statusCode: 401,
        headers,
        body: JSON.stringify({ error: "Token não fornecido" }),
      };
    }

    // Extrai ID da URL se houver (doctors/123 ou doctors?id=123)
    const pathParts = event.path.split("/");
    const doctorId =
      pathParts[pathParts.length - 1] !== "doctors"
        ? pathParts[pathParts.length - 1]
        : null;

    // GET - Listar ou buscar por ID
    if (event.httpMethod === "GET") {
      let url = `${SUPABASE_URL}/rest/v1/doctors`;

      if (doctorId && doctorId !== "doctors") {
        // Buscar por ID específico
        url += `?id=eq.${doctorId}&select=*`;
      } else if (event.queryStringParameters) {
        // Adiciona filtros da query string
        const params = new URLSearchParams(
          event.queryStringParameters as Record<string, string>
        );
        url += `?${params.toString()}`;

        // Adiciona select=* se não tiver
        if (!params.has("select")) {
          url += url.includes("?") ? "&select=*" : "?select=*";
        }
      } else {
        url += "?select=*";
      }

      const response = await fetch(url, {
        method: "GET",
        headers: {
          apikey: SUPABASE_ANON_KEY,
          Authorization: authHeader,
        },
      });

      let data = await response.json();

      // Se buscar por ID, retorna o objeto diretamente (não array)
      if (
        doctorId &&
        doctorId !== "doctors" &&
        Array.isArray(data) &&
        data.length > 0
      ) {
        data = data[0];
      }

      return {
        statusCode: response.status,
        headers: {
          ...headers,
          "Content-Type": "application/json",
        },
        body: JSON.stringify(data),
      };
    }

    // POST - Criar médico
    if (event.httpMethod === "POST") {
      const body = JSON.parse(event.body || "{}");

      if (
        !body.crm ||
        !body.crm_uf ||
        !body.full_name ||
        !body.cpf ||
        !body.email
      ) {
        return {
          statusCode: 400,
          headers,
          body: JSON.stringify({
            error: "Campos obrigatórios: crm, crm_uf, full_name, cpf, email",
          }),
        };
      }

      const response = await fetch(`${SUPABASE_URL}/rest/v1/doctors`, {
        method: "POST",
        headers: {
          apikey: SUPABASE_ANON_KEY,
          Authorization: authHeader,
          "Content-Type": "application/json",
          Prefer: "return=representation",
        },
        body: JSON.stringify(body),
      });

      let data = await response.json();

      // Supabase retorna array, pega o primeiro
      if (Array.isArray(data) && data.length > 0) {
        data = data[0];
      }

      return {
        statusCode: response.status,
        headers: {
          ...headers,
          "Content-Type": "application/json",
        },
        body: JSON.stringify(data),
      };
    }

    // PATCH - Atualizar médico
    if (event.httpMethod === "PATCH") {
      if (!doctorId || doctorId === "doctors") {
        return {
          statusCode: 400,
          headers,
          body: JSON.stringify({ error: "ID do médico é obrigatório" }),
        };
      }

      const body = JSON.parse(event.body || "{}");

      const response = await fetch(
        `${SUPABASE_URL}/rest/v1/doctors?id=eq.${doctorId}`,
        {
          method: "PATCH",
          headers: {
            apikey: SUPABASE_ANON_KEY,
            Authorization: authHeader,
            "Content-Type": "application/json",
            Prefer: "return=representation",
          },
          body: JSON.stringify(body),
        }
      );

      let data = await response.json();

      if (Array.isArray(data) && data.length > 0) {
        data = data[0];
      }

      return {
        statusCode: response.status,
        headers: {
          ...headers,
          "Content-Type": "application/json",
        },
        body: JSON.stringify(data),
      };
    }

    // DELETE - Deletar médico
    if (event.httpMethod === "DELETE") {
      if (!doctorId || doctorId === "doctors") {
        return {
          statusCode: 400,
          headers,
          body: JSON.stringify({ error: "ID do médico é obrigatório" }),
        };
      }

      const response = await fetch(
        `${SUPABASE_URL}/rest/v1/doctors?id=eq.${doctorId}`,
        {
          method: "DELETE",
          headers: {
            apikey: SUPABASE_ANON_KEY,
            Authorization: authHeader,
          },
        }
      );

      return {
        statusCode: response.status,
        headers,
        body: "",
      };
    }

    return {
      statusCode: 405,
      headers,
      body: JSON.stringify({ error: "Method Not Allowed" }),
    };
  } catch (error) {
    console.error("Erro na API de médicos:", error);

    return {
      statusCode: 500,
      headers,
      body: JSON.stringify({
        error: "Erro interno no servidor",
        message: error instanceof Error ? error.message : "Erro desconhecido",
      }),
    };
  }
};