import { createClient } from '@supabase/supabase-js';
import os from 'os';
import path from 'path';
import fs from 'fs';
import dotenv from 'dotenv';

// Load .env in development if present
dotenv.config();

const CONFIG_DIR = path.join(os.homedir(), '.config', 'velowork');
const CONFIG_FILE = path.join(CONFIG_DIR, 'session.json');

// File-based Storage Provider for Supabase auth persistence
const cliStorage = {
  getItem(key: string): string | null {
    try {
      if (!fs.existsSync(CONFIG_FILE)) return null;
      const fileContent = fs.readFileSync(CONFIG_FILE, 'utf8');
      const data = JSON.parse(fileContent);
      return data[key] ?? null;
    } catch {
      return null;
    }
  },
  setItem(key: string, value: string): void {
    try {
      fs.mkdirSync(CONFIG_DIR, { recursive: true });
      let data: Record<string, string> = {};
      if (fs.existsSync(CONFIG_FILE)) {
        try {
          const fileContent = fs.readFileSync(CONFIG_FILE, 'utf8');
          data = JSON.parse(fileContent);
        } catch {}
      }
      data[key] = value;
      fs.writeFileSync(CONFIG_FILE, JSON.stringify(data, null, 2), 'utf8');
    } catch (e) {
      // Fail silently or handle error
    }
  },
  removeItem(key: string): void {
    try {
      if (!fs.existsSync(CONFIG_FILE)) return;
      let data: Record<string, string> = {};
      try {
        const fileContent = fs.readFileSync(CONFIG_FILE, 'utf8');
        data = JSON.parse(fileContent);
      } catch {}
      delete data[key];
      fs.writeFileSync(CONFIG_FILE, JSON.stringify(data, null, 2), 'utf8');
    } catch (e) {
      // Fail silently
    }
  }
};

const supabaseUrl = 
  process.env.VELOWORK_SUPABASE_URL || 
  process.env.NEXT_PUBLIC_SUPABASE_URL || 
  'https://fhgswkdhndmgnaofewow.supabase.co';

const supabaseAnonKey = 
  process.env.VELOWORK_SUPABASE_ANON_KEY || 
  process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY || 
  'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJzdXBhYmFzZSIsInJlZiI6ImZoZ3N3a2RobmRtZ25hb2Zld293Iiwicm9sZSI6ImFub24iLCJpYXQiOjE3NjQ1MjIxNDcsImV4cCI6MjA4MDA5ODE0N30.zHgEI8-JXpFUrjwcs9wAXKXTDAi0ZQcwRo2PoMHvThI';

export const supabase = createClient(supabaseUrl, supabaseAnonKey, {
  auth: {
    storage: cliStorage,
    autoRefreshToken: true,
    persistSession: true,
    detectSessionInUrl: false,
  }
});

// Helper functions for session management
export function getStoredSession() {
  try {
    if (!fs.existsSync(CONFIG_FILE)) return null;
    const fileContent = fs.readFileSync(CONFIG_FILE, 'utf8');
    const data = JSON.parse(fileContent);
    // Supabase stores the session using a key like "sb-<project-ref>-auth-token"
    const storageKey = Object.keys(data).find(key => key.startsWith('sb-') && key.endsWith('-auth-token'));
    if (storageKey && data[storageKey]) {
      return JSON.parse(data[storageKey]);
    }
  } catch {}
  return null;
}

export function clearStoredSession() {
  try {
    if (fs.existsSync(CONFIG_FILE)) {
      fs.unlinkSync(CONFIG_FILE);
    }
  } catch {}
}

export function getCachedValue(key: string): any {
  try {
    if (!fs.existsSync(CONFIG_FILE)) return null;
    const fileContent = fs.readFileSync(CONFIG_FILE, 'utf8');
    const data = JSON.parse(fileContent);
    return data[key];
  } catch {
    return null;
  }
}

export function setCachedValue(key: string, value: any): void {
  try {
    fs.mkdirSync(CONFIG_DIR, { recursive: true });
    let data: any = {};
    if (fs.existsSync(CONFIG_FILE)) {
      const fileContent = fs.readFileSync(CONFIG_FILE, 'utf8');
      data = JSON.parse(fileContent);
    }
    data[key] = value;
    fs.writeFileSync(CONFIG_FILE, JSON.stringify(data, null, 2), 'utf8');
  } catch {}
}