package com.example.shiftalarm

import android.content.Context
import android.content.Intent
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ArrayAdapter
import android.widget.Toast
import androidx.fragment.app.Fragment
import com.example.shiftalarm.databinding.FragmentSettingsBasicBinding
import java.io.BufferedInputStream
import java.io.File
import java.io.FileOutputStream
import java.net.HttpURLConnection
import android.app.ProgressDialog
import android.net.Uri
import android.os.Build
import androidx.core.content.FileProvider
import androidx.lifecycle.lifecycleScope
import kotlinx.coroutines.launch
import android.provider.Settings
import androidx.core.content.ContextCompat

class FragmentSettingsBasic : Fragment() {

    private var _binding: FragmentSettingsBasicBinding? = null
    private val binding get() = _binding!!

    private val PREFS_NAME = "ShiftAlarmPrefs"
    private var isUserInteraction = false

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View {
        _binding = FragmentSettingsBasicBinding.inflate(inflater, container, false)
        return binding.root
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        loadSettings()
        setupListeners()
    }

    private fun loadSettings() {
        val prefs = requireContext().getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)

        // Factory Spinner
        setupFactorySpinner(prefs)

        // Team Spinner
        setupTeamSpinner(prefs)
        
        // Version Info
        try {
            val pInfo = requireContext().packageManager.getPackageInfo(requireContext().packageName, 0)
            binding.versionInfo.text = "Ver. ${pInfo.versionName} | 제작자: 산적이얌"
        } catch (e: Exception) {
            binding.versionInfo.text = "Ver. Unknown | 제작자: 산적이얌"
        }

        // Show/Hide Exact Alarm based on version
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
            binding.btnExactAlarm.visibility = View.VISIBLE
            binding.dividerExact.visibility = View.VISIBLE
        } else {
            binding.btnExactAlarm.visibility = View.GONE
            binding.dividerExact.visibility = View.GONE
        }
    }

    private fun setupFactorySpinner(prefs: android.content.SharedPreferences) {
        val savedFactory = prefs.getString("selected_factory", "Jeonju")
        val factoryIndex = if (savedFactory == "Nonsan") 1 else 0
        binding.factorySpinner.setSelection(factoryIndex)

        binding.factorySpinner.setOnTouchListener { _, _ ->
            isUserInteraction = true
            false
        }

        binding.factorySpinner.onItemSelectedListener = object : android.widget.AdapterView.OnItemSelectedListener {
            override fun onItemSelected(parent: android.widget.AdapterView<*>?, view: View?, position: Int, id: Long) {
                if (!isUserInteraction) return

                val isNonsan = position == 1
                val factory = if (isNonsan) "Nonsan" else "Jeonju"
                
                val currentFactory = prefs.getString("selected_factory", "Jeonju")
                if (factory == currentFactory) {
                    // Just update team spinner without resetting times if same factory
                    updateTeamSpinner(isNonsan)
                    return
                }

                // Save immediately
                val editor = prefs.edit()
                editor.putString("selected_factory", factory)
                editor.apply()
                
                // CRUCIAL: Re-sync all alarms for the new factory
                lifecycleScope.launch {
                    syncAllAlarms(requireContext())
                    Toast.makeText(requireContext(), "공장 설정이 변경되었습니다.", Toast.LENGTH_SHORT).show()
                }

                // Update Team Spinner logic
                updateTeamSpinner(isNonsan)
            }
            override fun onNothingSelected(parent: android.widget.AdapterView<*>?) {}
        }
    }
    
    private fun updateTeamSpinner(isNonsan: Boolean) {
        val currentSelection = binding.teamSpinner.selectedItemPosition
        val teamOptions = if (isNonsan) {
            arrayOf("A반", "B반", "C반")
        } else {
            arrayOf("A반", "B반", "C반", "D반")
        }
        
        val adapter = ArrayAdapter(requireContext(), android.R.layout.simple_spinner_item, teamOptions)
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
        binding.teamSpinner.adapter = adapter
        
        if (currentSelection < teamOptions.size) {
            binding.teamSpinner.setSelection(currentSelection)
        } else {
            binding.teamSpinner.setSelection(0)
            if (isUserInteraction) {
                 Toast.makeText(requireContext(), "논산 회사는 D반이 없습니다. A반으로 설정됩니다.", Toast.LENGTH_SHORT).show()
                 val prefs = requireContext().getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)
                 prefs.edit().putString("selected_team", "A").apply()
            }
        }
    }

    private fun setupTeamSpinner(prefs: android.content.SharedPreferences) {
        val savedFactory = prefs.getString("selected_factory", "Jeonju")
        val isNonsan = savedFactory == "Nonsan"
        updateTeamSpinner(isNonsan)

        val savedTeam = prefs.getString("selected_team", "A")
        val teamIndex = when (savedTeam) {
            "A" -> 0
            "B" -> 1
            "C" -> 2
            "D" -> if (isNonsan) 0 else 3
            else -> 0
        }
        binding.teamSpinner.setSelection(teamIndex)

        binding.teamSpinner.setOnTouchListener { _, _ ->
            isUserInteraction = true
            false
        }

        binding.teamSpinner.onItemSelectedListener = object : android.widget.AdapterView.OnItemSelectedListener {
            override fun onItemSelected(parent: android.widget.AdapterView<*>?, view: View?, position: Int, id: Long) {
                 if (!isUserInteraction) return
                 
                 val selectedTeam = when(position) {
                    0 -> "A"
                    1 -> "B"
                    2 -> "C"
                    3 -> "D"
                    else -> "A"
                }
                prefs.edit().putString("selected_team", selectedTeam).apply()
                
                // CRUCIAL: Re-sync all alarms for the new team
                lifecycleScope.launch {
                    syncAllAlarms(requireContext())
                    Toast.makeText(requireContext(), "${selectedTeam}반으로 알람이 재설정되었습니다.", Toast.LENGTH_SHORT).show()
                }
            }

            override fun onNothingSelected(parent: android.widget.AdapterView<*>?) {}
        }
    }

    override fun onResume() {
        super.onResume()
        updatePermissionStatuses()
    }

    private fun updatePermissionStatuses() {
        val context = requireContext()
        
        // 1. 배터리 (Battery)
        val isBatteryIgnored = AlarmPermissionUtil.getBatteryOptimizationStatus(context)
        binding.tvBatteryStatus.text = if (isBatteryIgnored) "[설정 완료: 절전 예외]" else "클릭하여 '제한 없음'으로 설정하세요"
        binding.tvBatteryStatus.setTextColor(ContextCompat.getColor(context, if (isBatteryIgnored) R.color.primary else R.color.shift_red))

        // 2. 정확한 알람 (Exact Alarm) - Android 12+
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
            val isExactGranted = AlarmPermissionUtil.getExactAlarmStatus(context)
            binding.tvExactStatus.text = if (isExactGranted) "[설정 완료: 정밀 알람]" else "필수: 클릭하여 권한을 허용하세요"
            binding.tvExactStatus.setTextColor(ContextCompat.getColor(context, if (isExactGranted) R.color.primary else R.color.shift_red))
        } else {
            binding.btnExactAlarm.visibility = View.GONE
            binding.dividerExact.visibility = View.GONE
        }

        // 3. 다른 앱 위에 표시 (Overlay)
        val isOverlayGranted = AlarmPermissionUtil.getOverlayStatus(context)
        binding.tvOverlayStatus.text = if (isOverlayGranted) "[설정 완료: 화면 우위]" else "필수: 알람창 노출을 위해 허용하세요"
        binding.tvOverlayStatus.setTextColor(ContextCompat.getColor(context, if (isOverlayGranted) R.color.primary else R.color.shift_red))

        // 4. 전체화면 알림 (Full Screen Intent) - Android 14+
        if (Build.VERSION.SDK_INT >= 34) {
            val isFullScreenGranted = AlarmPermissionUtil.getFullScreenIntentStatus(context)
            binding.tvFullScreenStatus.text = if (isFullScreenGranted) "[설정 완료: 전체화면]" else "필수: 안드로이드 14 이상 필수 설정"
            binding.tvFullScreenStatus.setTextColor(ContextCompat.getColor(context, if (isFullScreenGranted) R.color.primary else R.color.shift_red))
            binding.btnFullScreenIntent.visibility = View.VISIBLE
        } else {
            binding.btnFullScreenIntent.visibility = View.GONE
        }
    }

    private fun setupListeners() {
        val prefs = requireContext().getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)

        binding.btnBatteryOptimize.setOnClickListener {
            AlarmPermissionUtil.requestBatteryOptimization(requireContext())
        }

        binding.btnExactAlarm.setOnClickListener {
             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
                val intent = Intent(Settings.ACTION_REQUEST_SCHEDULE_EXACT_ALARM).apply {
                    data = Uri.parse("package:${requireContext().packageName}")
                }
                startActivity(intent)
            }
        }

        binding.btnOverlayPermission.setOnClickListener {
            AlarmPermissionUtil.requestOverlayPermission(requireContext())
        }

        binding.btnFullScreenIntent.setOnClickListener {
            AlarmPermissionUtil.requestFullScreenIntentPermission(requireContext())
        }

        binding.btnPermissionSettings.setOnClickListener {
            val intent = Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS).apply {
                data = Uri.parse("package:${requireContext().packageName}")
            }
            startActivity(intent)
        }

        binding.btnCheckUpdate.setOnClickListener {
            checkUpdate()
        }
    }
    
    private fun checkUpdate() {
        AppUpdateManager.checkUpdate(requireActivity(), silent = false)
    }

    override fun onDestroyView() {
        super.onDestroyView()
        _binding = null
    }
}