const fs = require('fs');
const path = require('path');

// WHY: .mcp.json is gitignored but already holds the Plane credentials for the MCP
// server, so reusing it keeps the API key in a single place instead of duplicating it.
const MCP_PATH = path.join(__dirname, '..', '..', '.mcp.json');

const DEFAULT_PROJECT_ID = '643f7055-1237-4912-912f-99ec49fd0f0e';
const DEFAULT_PROJECT_IDENTIFIER = 'MITHOME';

function loadDotEnv() {
  try {
    const envPath = path.join(__dirname, '..', '..', '.env');
    if (fs.existsSync(envPath)) {
      const lines = fs.readFileSync(envPath, 'utf8').split('\n');
      for (const line of lines) {
        const trimmed = line.trim();
        if (!trimmed || trimmed.startsWith('#')) continue;
        const idx = trimmed.indexOf('=');
        if (idx > 0) process.env[trimmed.slice(0, idx).trim()] = trimmed.slice(idx + 1).trim();
      }
    }
  } catch (error) {
    console.warn('⚠️ .env load error:', error.message);
  }
}

function loadMcpConfig() {
  try {
    if (fs.existsSync(MCP_PATH)) {
      const mcp = JSON.parse(fs.readFileSync(MCP_PATH, 'utf8'));
      const plane = mcp.mcpServers && mcp.mcpServers.plane;
      return plane && plane.env ? plane.env : {};
    }
  } catch (error) {
    console.warn('⚠️ .mcp.json parse error:', error.message);
  }
  return {};
}

// DECISION: env vars override .mcp.json so CI/CD can supply its own credentials.
function getConfig() {
  const mcp = loadMcpConfig();
  return {
    apiKey: process.env.PLANE_API_KEY || mcp.PLANE_API_KEY,
    host: (process.env.PLANE_API_HOST_URL || mcp.PLANE_API_HOST_URL || 'https://pm.llmdev.mozdit.hu/').replace(/\/+$/, ''),
    workspace: process.env.PLANE_WORKSPACE_SLUG || mcp.PLANE_WORKSPACE_SLUG,
    projectId: process.env.PLANE_PROJECT_ID || DEFAULT_PROJECT_ID,
    projectIdentifier: process.env.PLANE_PROJECT_IDENTIFIER || DEFAULT_PROJECT_IDENTIFIER
  };
}

module.exports = { getConfig, loadDotEnv };