package com.parentalmonitor.child.ui.paircode

import android.content.Intent
import android.os.Build
import android.os.Bundle
import android.view.View
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import androidx.lifecycle.lifecycleScope
import com.parentalmonitor.child.BuildConfig
import com.parentalmonitor.child.ParentalMonitorApp
import com.parentalmonitor.child.R
import com.parentalmonitor.child.ui.permissions.PermissionsSetupActivity
import kotlinx.coroutines.delay
import kotlinx.coroutines.launch

class PairCodeActivity : AppCompatActivity() {

    private val apiClient by lazy { (application as ParentalMonitorApp).apiClient }
    private var isPolling = false

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        if (apiClient.isDeviceLinked) {
            startActivity(Intent(this, PermissionsSetupActivity::class.java))
            finish()
            return
        }

        setContentView(R.layout.activity_pair_code)

        val etPairCode = findViewById<com.google.android.material.textfield.TextInputEditText>(R.id.etPairCode)
        val btnVerify = findViewById<com.google.android.material.button.MaterialButton>(R.id.btnVerify)
        val progressBar = findViewById<android.widget.ProgressBar>(R.id.progressBar)
        val tvError = findViewById<android.widget.TextView>(R.id.tvError)
        val tvStatus = findViewById<android.widget.TextView>(R.id.tvStatus)

        btnVerify.setOnClickListener {
            val code = etPairCode.text.toString().trim()

            if (code.length != 6 || !code.all { it.isDigit() }) {
                tvError.text = "Please enter a valid 6-digit pair code."
                tvError.visibility = View.VISIBLE
                return@setOnClickListener
            }

            tvError.visibility = View.GONE
            btnVerify.isEnabled = false
            progressBar.visibility = View.VISIBLE

            val deviceName = "${Build.MANUFACTURER} ${Build.MODEL}"
            val deviceModel = Build.MODEL
            val androidVersion = Build.VERSION.RELEASE
            val appVersion = BuildConfig.VERSION_NAME

            lifecycleScope.launch {
                val result = apiClient.verifyPairCode(
                    code, deviceName, deviceModel, androidVersion, appVersion
                )

                if (result.success && result.data != null) {
                    apiClient.deviceId = result.data.deviceId
                    tvStatus.text = "Waiting for admin approval..."
                    tvStatus.visibility = View.VISIBLE
                    progressBar.visibility = View.VISIBLE

                    // Start polling for approval
                    startApprovalPolling(result.data.deviceId)
                } else {
                    tvError.text = result.message
                    tvError.visibility = View.VISIBLE
                    btnVerify.isEnabled = true
                    progressBar.visibility = View.GONE
                }
            }
        }
    }

    private fun startApprovalPolling(deviceId: Int) {
        isPolling = true
        lifecycleScope.launch {
            while (isPolling) {
                delay(3000) // Poll every 3 seconds

                val result = apiClient.checkApproval(deviceId)
                if (result.success && result.data != null) {
                    when {
                        result.data.isApproved -> {
                            isPolling = false
                            Toast.makeText(
                                this@PairCodeActivity,
                                "Device approved! Setting up permissions...",
                                Toast.LENGTH_LONG
                            ).show()

                            // Go to permissions setup
                            startActivity(Intent(this@PairCodeActivity, PermissionsSetupActivity::class.java))
                            finish()
                        }
                        result.data.approvalStatus == "denied" -> {
                            isPolling = false
                            apiClient.deviceId = -1
                            val tvError = findViewById<android.widget.TextView>(R.id.tvError)
                            tvError.text = "Device was denied by admin. Please try again."
                            tvError.visibility = View.VISIBLE
                            findViewById<android.widget.ProgressBar>(R.id.progressBar).visibility = View.GONE
                            findViewById<com.google.android.material.button.MaterialButton>(R.id.btnVerify).isEnabled = true
                            findViewById<android.widget.TextView>(R.id.tvStatus).visibility = View.GONE
                        }
                    }
                }
            }
        }
    }

    override fun onDestroy() {
        super.onDestroy()
        isPolling = false
    }
}