import { Adb, AdbDaemonTransport } from '@yume-chan/adb'
import { type AdbDaemonWebUsbDevice, AdbDaemonWebUsbDeviceManager } from '@yume-chan/adb-daemon-webusb'
import { type BrowserWindow } from 'electron'
import { WebUSB } from 'usb'

import { type AdbCredentialStore, adbGeneratePublicKey } from '@yume-chan/adb'
import { webcrypto } from 'node:crypto'
import { readFile, writeFile } from 'node:fs/promises'
import { homedir, hostname, userInfo } from 'node:os'
import { join } from 'node:path'

class AdbNodeJsCredentialStore implements AdbCredentialStore {
  #name: string

  constructor(name: string) {
    this.#name = name
  }

  #privateKeyPath() {
    return join(homedir(), '.android', 'adbkey')
  }

  #publicKeyPath() {
    return join(homedir(), '.android', 'adbkey.pub')
  }

  async generateKey() {
    const { privateKey: cryptoKey } = await webcrypto.subtle.generateKey(
      {
        name: 'RSASSA-PKCS1-v1_5',
        modulusLength: 2048,
        // 65537
        publicExponent: new Uint8Array([0x01, 0x00, 0x01]),
        hash: 'SHA-1'
      },
      true,
      ['sign', 'verify']
    )

    const privateKey = new Uint8Array(await crypto.subtle.exportKey('pkcs8', cryptoKey))
    await writeFile(this.#privateKeyPath(), Buffer.from(privateKey).toString('utf8'))
    await writeFile(
      this.#publicKeyPath(),
      `${Buffer.from(adbGeneratePublicKey(privateKey)).toString('base64')} ${this.#name}\n`
    )

    return {
      buffer: privateKey,
      name: this.#name
    }
  }

  async #readPubKeyName() {
    const content = await readFile(this.#publicKeyPath(), 'utf8')
    const pubKeyName = content.split(' ')[1]
    return pubKeyName || `${userInfo().username}@${hostname()}`
  }

  async *iterateKeys() {
    const content = await readFile(this.#privateKeyPath(), 'utf8')
    const privateKey = Buffer.from(content.split('\n').slice(1, -2).join(''), 'base64')
    yield {
      buffer: privateKey,
      name: await this.#readPubKeyName()
    }
  }
}

type ConnectedDevice = {
  [serial: string]: {
    adb: Adb
    metadata: {
      venderId?: number
      productId?: number
      manufacturerNam?: string
      productName?: string
      serialNumber?: string
    }
  }
}

export class AdbUsbNative {
  private _manager: AdbDaemonWebUsbDeviceManager
  private _win: BrowserWindow

  private _connectedDevices: ConnectedDevice = {}

  constructor(win: BrowserWindow) {
    const webUsb: WebUSB = new WebUSB({ allowedDevices: [{ serialNumber: 'd' }] })
    this._manager = new AdbDaemonWebUsbDeviceManager(webUsb)
    this._win = win
  }

  getAvailableDevices(responseChannel: string) {
    this._manager.getDevices().then(devices => {
      this._win.webContents.send(
        responseChannel,
        devices.map(d => ({
          vendorId: d.raw.vendorId,
          productId: d.raw.productId,
          manufacturerNam: d.raw.manufacturerName,
          productName: d.raw.productName,
          serialNumber: d.raw.serialNumber
        }))
      )
    })
  }

  getConnectedDevices(responseChannel: string) {
    this._win.webContents.send(
      responseChannel,
      Object.entries(this._connectedDevices).map(([serial, { metadata }]) => ({
        serial: serial,
        productId: metadata.productId,
        venderId: metadata.venderId,
        manufacturerNam: metadata.manufacturerNam,
        productName: metadata.productName
      }))
    )
  }

  connectDevice(responseChanel: string, serial: string) {
    this._manager.getDevices().then(devices => {
      let device: AdbDaemonWebUsbDevice | null = null
      for (const d of devices) {
        if (d.serial === serial) {
          device = d
          break
        }
      }

      if (!device) {
        this._win.webContents.send(responseChanel, {
          error: 'Device with serialNumber: ' + serial + ' not found'
        })
        return
      }

      device.connect().then(connection => {
        const credentialStore = new AdbNodeJsCredentialStore(`${userInfo().username}@${hostname()}`)

        AdbDaemonTransport.authenticate({
          serial: device!.serial,
          connection,
          credentialStore
        }).then(transport => {
          this._connectedDevices[device!.serial] = {
            adb: new Adb(transport),
            metadata: {
              venderId: device!.raw.vendorId,
              productId: device!.raw.productId,
              manufacturerNam: device!.raw.manufacturerName,
              productName: device!.raw.productName,
              serialNumber: device!.raw.serialNumber
            }
          }

          this._win.webContents.send(responseChanel, {
            serial: device!.serial
          })
        })
      })
    })
  }
}