const { app, BrowserWindow, ipcMain, shell } = require('electron')
const path = require('path')
const { execFile } = require('child_process')
const fs = require('fs')
const os = require('os')

const isDev = process.env.NODE_ENV === 'development'
const VITE_PORT = 5173

let mainWindow = null

// ── Wallet storage directory ───────────────────────────────────────────────────
const WALLET_DIR = path.join(os.homedir(), '.wallet-generator', 'wallet')

function ensureWalletDir() {
  fs.mkdirSync(WALLET_DIR, { recursive: true })
}

// ── Resolve Python executable ──────────────────────────────────────────────────
function findPython() {
  const repoRoot = path.join(__dirname, '..', '..')
  const venvPython = path.join(repoRoot, 'venv', 'bin', 'python')
  return fs.existsSync(venvPython) ? venvPython : 'python3'
}

// ── Call Python CLI ────────────────────────────────────────────────────────────
function callPython(command, args = {}) {
  return new Promise((resolve, reject) => {
    const python = findPython()
    const repoRoot = path.join(__dirname, '..', '..')
    const cliPath = path.join(repoRoot, 'src', 'cli.py')

    execFile(python, [cliPath, command, JSON.stringify(args)], { cwd: repoRoot }, (err, stdout, stderr) => {
      if (err) { reject(new Error(stderr || err.message)); return }
      try {
        const result = JSON.parse(stdout.trim())
        if (result.ok) resolve(result.data)
        else reject(new Error(result.error))
      } catch {
        reject(new Error('Invalid Python output: ' + stdout))
      }
    })
  })
}

// ── IPC handlers ───────────────────────────────────────────────────────────────
ipcMain.handle('hd-generate', (_, args) => callPython('hd_generate', args))
ipcMain.handle('hd-encrypt',  (_, args) => callPython('hd_encrypt',  args))
ipcMain.handle('hd-decrypt',  (_, args) => callPython('hd_decrypt',  args))
ipcMain.handle('p2pk',        (_, args) => callPython('p2pk',        args))
ipcMain.handle('p2pkh',       (_, args) => callPython('p2pkh',       args))
ipcMain.handle('p2sh',        (_, args) => callPython('p2sh',        args))
ipcMain.handle('p2wpkh',      (_, args) => callPython('p2wpkh',      args))
ipcMain.handle('p2tr',        (_, args) => callPython('p2tr',        args))
ipcMain.handle('single-encrypt', (_, args) => callPython('single_encrypt', args))

ipcMain.handle('save-wallet', (_, { filename, data }) => {
  ensureWalletDir()
  const filePath = path.join(WALLET_DIR, filename)
  fs.writeFileSync(filePath, JSON.stringify(data, null, 2), 'utf-8')
  return filePath
})

ipcMain.handle('get-wallet-dir', () => {
  ensureWalletDir()
  return WALLET_DIR
})

// ── Create window ──────────────────────────────────────────────────────────────
function createWindow() {
  mainWindow = new BrowserWindow({
    width: 1200,
    height: 750,
    minWidth: 900,
    minHeight: 600,
    title: 'Wallet Generator',
    backgroundColor: '#0f1117',
    webPreferences: {
      nodeIntegration: false,
      contextIsolation: true,
      preload: path.join(__dirname, 'preload.cjs'),
    },
  })

  mainWindow.setMenuBarVisibility(false)

  const url = isDev
    ? `http://localhost:${VITE_PORT}`
    : `file://${path.join(__dirname, '..', 'dist', 'index.html')}`

  mainWindow.loadURL(url)

  mainWindow.webContents.setWindowOpenHandler(({ url }) => {
    shell.openExternal(url)
    return { action: 'deny' }
  })

  mainWindow.on('closed', () => { mainWindow = null })
}

// ── App lifecycle ──────────────────────────────────────────────────────────────
app.whenReady().then(createWindow)

app.on('window-all-closed', () => {
  if (process.platform !== 'darwin') app.quit()
})

app.on('activate', () => {
  if (mainWindow === null) createWindow()
})