/**
 * Netlify Function: Upload Avatar
 * POST /storage/v1/object/avatars/{userId}/avatar
 *
 * Aceita JSON com base64 para simplificar o upload via Netlify Functions
 */

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": "POST, OPTIONS",
  };

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

  if (event.httpMethod !== "POST") {
    return {
      statusCode: 405,
      headers,
      body: JSON.stringify({ error: "Method Not Allowed" }),
    };
  }

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

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

    // Extrai userId do query string
    const userId = event.queryStringParameters?.userId;

    if (!userId) {
      return {
        statusCode: 400,
        headers,
        body: JSON.stringify({ error: "userId é obrigatório" }),
      };
    }

    // Parse JSON body com base64
    let fileData: string;
    let contentType: string;

    try {
      const body = JSON.parse(event.body || "{}");
      fileData = body.fileData; // base64 string
      contentType = body.contentType || "image/jpeg";

      if (!fileData) {
        return {
          statusCode: 400,
          headers,
          body: JSON.stringify({ error: "fileData (base64) é obrigatório" }),
        };
      }
    } catch {
      return {
        statusCode: 400,
        headers,
        body: JSON.stringify({
          error: "Body deve ser JSON válido com fileData em base64",
        }),
      };
    }

    // Converte base64 para Buffer
    const buffer = Buffer.from(fileData, "base64");

    // Upload para Supabase Storage
    const response = await fetch(
      `${SUPABASE_URL}/storage/v1/object/avatars/${userId}/avatar`,
      {
        method: "POST",
        headers: {
          apikey: SUPABASE_ANON_KEY,
          Authorization: authHeader,
          "Content-Type": contentType,
          "x-upsert": "true", // Sobrescreve se já existir
        },
        body: buffer,
      }
    );

    const data = await response.json();

    if (!response.ok) {
      console.error("Erro do Supabase:", data);
      return {
        statusCode: response.status,
        headers: {
          ...headers,
          "Content-Type": "application/json",
        },
        body: JSON.stringify({
          error: data.error || "Erro ao fazer upload no Supabase",
          details: data,
        }),
      };
    }

    return {
      statusCode: 200,
      headers: {
        ...headers,
        "Content-Type": "application/json",
      },
      body: JSON.stringify({
        message: "Upload realizado com sucesso",
        path: data.Key || data.path,
        fullPath: data.Key || data.path,
      }),
    };
  } catch (error) {
    console.error("Erro no upload do avatar:", error);

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