package com.example.myapplication

import android.content.ComponentName
import android.content.Intent
import android.graphics.Color
import android.os.Bundle
import android.provider.Settings
import android.util.Log
import android.view.inputmethod.InputMethodManager
import android.widget.ImageView
import android.widget.LinearLayout
import android.widget.TextView
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import com.example.myapplication.network.BehaviorReporter
import com.example.myapplication.utils.ImeUtils

class ImeGuideActivity : AppCompatActivity() {

    private val TAG = "ImeGuideActivity"

    // 改成可空，避免 findViewById 返回 null 时直接 NPE
    private var btnEnable: LinearLayout? = null
    private var btnSelect: LinearLayout? = null
    private var tvStep1Status: TextView? = null
    private var tvStep2Status: TextView? = null
    private var btnEnabledText: TextView? = null
    private var btnSelectText: TextView? = null
    private var btnEnabledimg: ImageView? = null
    private var btnSelectimg: ImageView? = null

    private var imeObserver: android.database.ContentObserver? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_ime_guide)

        BehaviorReporter.report(
            isNewUser = false,
            "page_id" to "keyboard_permission_guide",
        )

        Log.d(TAG, "onCreate")

        btnEnable = findViewById(R.id.enabled)            // btn启用输入法
        btnSelect = findViewById(R.id.select)            // btn选择输入法
        tvStep1Status = findViewById(R.id.Steps)         // 第一步的提示
        tvStep2Status = findViewById(R.id.stepTips)      // 第二步的提示
        btnEnabledText = findViewById(R.id.btnEnabledText)   // 启用输入法按钮文字
        btnSelectText = findViewById(R.id.btnSelectText)     // 选择输入法按钮文字
        btnEnabledimg = findViewById(R.id.btnEnabledimg)     // 启用输入法按钮图片
        btnSelectimg = findViewById(R.id.btnSelectimg)       // 选择输入法按钮图片
    }

    override fun onResume() {
        super.onResume()
        try {
            refreshStatus()
        } catch (e: Exception) {
            Log.e(TAG, "refreshStatus 崩了", e)
        }

        try {
            registerImeObserver()
        } catch (e: Exception) {
            Log.e(TAG, "registerImeObserver 崩了", e)
        }
    }

    override fun onPause() {
        super.onPause()
        try {
            unregisterImeObserver()
        } catch (e: Exception) {
            Log.e(TAG, "unregisterImeObserver 崩了", e)
        }
    }

    override fun onBackPressed() {
        BehaviorReporter.report(
            isNewUser = false,
            "page_id" to "keyboard_permission_guide",
            "element_id" to "close_btn",
        )
        super.onBackPressed()
    }

    private fun registerImeObserver() {
        if (imeObserver != null) return

        imeObserver = object : android.database.ContentObserver(
            android.os.Handler(android.os.Looper.getMainLooper())
        ) {
            override fun onChange(selfChange: Boolean) {
                super.onChange(selfChange)
                try {
                    refreshStatus()
                } catch (e: Exception) {
                    Log.e(TAG, "onChange -> refreshStatus 崩了", e)
                }
            }
        }

        try {
            contentResolver.registerContentObserver(
                Settings.Secure.getUriFor(Settings.Secure.DEFAULT_INPUT_METHOD),
                false,
                imeObserver!!
            )
        } catch (e: SecurityException) {
            // 部分 ROM/系统可能在这里抛异常
            Log.e(TAG, "registerContentObserver SecurityException", e)
        } catch (e: Exception) {
            Log.e(TAG, "registerContentObserver 其他异常", e)
        }
    }

    private fun unregisterImeObserver() {
        imeObserver?.let {
            try {
                contentResolver.unregisterContentObserver(it)
            } catch (e: Exception) {
                Log.e(TAG, "unregisterContentObserver 异常", e)
            }
        }
        imeObserver = null
    }

    /** 刷新步骤状态（是否启用/选择） */
    private fun refreshStatus() {
        val enabled = isImeEnabled()
        val selected = isImeSelected()

        // 把所有 view 拿成局部变量并判空，避免 NPE
        val enableLayout = btnEnable
        val selectLayout = btnSelect
        val step1 = tvStep1Status
        val step2 = tvStep2Status
        val enableText = btnEnabledText
        val selectText = btnSelectText
        val enableImg = btnEnabledimg
        val selectImg = btnSelectimg

        if (enableLayout == null || selectLayout == null ||
            step1 == null || step2 == null ||
            enableText == null || selectText == null ||
            enableImg == null || selectImg == null
        ) {
            return
        }

        // 根据状态设置按钮的点击行为
        if (enabled) {
            // 输入法已启用时，禁用启用按钮的点击事件
            enableLayout.setOnClickListener(null)
        } else {
            // 输入法未启用时，设置启用按钮的点击事件
            enableLayout.setOnClickListener {
                startActivity(Intent(Settings.ACTION_INPUT_METHOD_SETTINGS))
            }
        }

        if (selected) {
            // 输入法已切换时，禁用选择按钮的点击事件
            selectLayout.setOnClickListener(null)
        } else {
            // 输入法未切换时，设置选择按钮的点击事件
            selectLayout.setOnClickListener {
                val imm = getSystemService(INPUT_METHOD_SERVICE) as InputMethodManager
                imm.showInputMethodPicker()
                BehaviorReporter.report(
                    isNewUser = false,
                    "page_id" to "keyboard_permission_guide",
                    "element_id" to "open_settings_btn",
                )
            }
        }

        if (!enabled && !selected) {
            enableLayout.background = getDrawable(R.drawable.ime_guide_activity_btn_unfinished)
            selectLayout.background = getDrawable(R.drawable.ime_guide_activity_btn_completed)
            enableText.setTextColor(Color.parseColor("#FFFFFF"))
            selectText.setTextColor(Color.parseColor("#A1A1A1"))
            enableImg.setImageResource(R.drawable.ime_guide_activity_btn_unfinished_img)
            selectImg.setImageResource(R.drawable.ime_guide_activity_btn_unfinished_img)
            step1.text = getString(R.string.imguide_text1_step1)
            step2.text = getString(R.string.imguide_text2_step1)
            selectLayout.setOnClickListener(null)
        } else if (!enabled && selected) {
            enableLayout.background = getDrawable(R.drawable.ime_guide_activity_btn_unfinished)
            selectLayout.background = getDrawable(R.drawable.ime_guide_activity_btn_completed)
            enableImg.setImageResource(R.drawable.ime_guide_activity_btn_unfinished_img)
            selectImg.setImageResource(R.drawable.ime_guide_activity_btn_unfinished_img)
            enableText.setTextColor(Color.parseColor("#FFFFFF"))
            selectText.setTextColor(Color.parseColor("#A1A1A1"))
            step1.text = getString(R.string.imguide_text1_step1)
            step2.text = getString(R.string.imguide_text2_step1)
            selectLayout.setOnClickListener(null)
        } else if (enabled && !selected) {
            enableLayout.background = getDrawable(R.drawable.ime_guide_activity_btn_completed)
            selectLayout.background = getDrawable(R.drawable.ime_guide_activity_btn_unfinished)
            enableImg.setImageResource(R.drawable.ime_guide_activity_btn_completed_img)
            selectImg.setImageResource(R.drawable.ime_guide_activity_btn_unfinished_img)
            enableText.setTextColor(Color.parseColor("#A1A1A1"))
            selectText.setTextColor(Color.parseColor("#FFFFFF"))
            step1.text =getString(R.string.imguide_text1_step2)
            step2.text = getString(R.string.imguide_text2_step2)
        } else if (enabled && selected) {
            enableLayout.background = getDrawable(R.drawable.ime_guide_activity_btn_completed)
            selectLayout.background = getDrawable(R.drawable.ime_guide_activity_btn_completed)
            enableImg.setImageResource(R.drawable.ime_guide_activity_btn_completed_img)
            selectImg.setImageResource(R.drawable.ime_guide_activity_btn_completed_img)
            enableText.setTextColor(Color.parseColor("#A1A1A1"))
            selectText.setTextColor(Color.parseColor("#A1A1A1"))
            step1.text =getString(R.string.imguide_text1_step3)
            step2.text = getString(R.string.imguide_text2_step3)
            BehaviorReporter.report(
                isNewUser = false,
                "page_id" to "keyboard_permission_guide",
                "element_id" to "close_btn",
            )
            Toast.makeText(this, getString(R.string.imguide_text2_step3_hint), Toast.LENGTH_SHORT).show()
            try {
                startActivity(Intent(this, GuideActivity::class.java))
            } catch (e: Exception) {
                Log.e(TAG, "启动 GuideActivity 失败，检查是否在 Manifest 中声明", e)
            }
            finish()
        }
    }

    private fun isImeEnabled(): Boolean = ImeUtils.isImeEnabled(this)

    private fun isImeSelected(): Boolean = ImeUtils.isImeSelected(this)
}