package com.beancount.mobile.accessibility

import android.content.Context
import android.graphics.PixelFormat
import android.os.Handler
import android.os.Looper
import android.util.Log
import android.view.Gravity
import android.view.LayoutInflater
import android.view.View
import android.view.WindowManager
import android.widget.LinearLayout
import android.widget.ProgressBar
import android.widget.TextView
import java.util.concurrent.CountDownLatch
import java.util.concurrent.TimeUnit

/**
 * 浮窗提示（plan.md「3.8 浮窗账单提示」）。
 *
 * 参考 AutoAccounting 的 FloatingTip + RepeatToast：
 * - 轻量浮窗（非全屏），滑入动画，自动消失
 * - 三种布局：顶部 / 左侧 / 右侧
 * - 倒计时进度环
 * - 重复账单提示（RepeatToast）
 *
 * 比 FloatingBillView 更轻：仅展示提示，不交互。
 * 需 SYSTEM_ALERT_WINDOW 权限（由 Config Plugin 注册）。
 */
class FloatingTip(
    private val context: Context,
    private val message: String,
    private val position: TipPosition = TipPosition.TOP,
    private val durationMs: Long = 3000L,
) {
    companion object {
        private const val TAG = "FloatingTip"
        private const val ANIM_DURATION = 300L
    }

    enum class TipPosition { TOP, LEFT, RIGHT }

    private val windowManager = context.getSystemService(Context.WINDOW_SERVICE) as WindowManager
    private var view: View? = null
    private val handler = Handler(Looper.getMainLooper())

    /** 显示浮窗提示。 */
    fun show() {
        try {
            val layoutParams = WindowManager.LayoutParams(
                WindowManager.LayoutParams.WRAP_CONTENT,
                WindowManager.LayoutParams.WRAP_CONTENT,
                WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY,
                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
                PixelFormat.TRANSLUCENT,
            ).apply {
                gravity = when (position) {
                    TipPosition.TOP -> Gravity.TOP or Gravity.CENTER_HORIZONTAL
                    TipPosition.LEFT -> Gravity.LEFT or Gravity.CENTER_VERTICAL
                    TipPosition.RIGHT -> Gravity.RIGHT or Gravity.CENTER_VERTICAL
                }
                y = if (position == TipPosition.TOP) 100 else 0
                x = if (position != TipPosition.TOP) 50 else 0
            }

            val container = LinearLayout(context).apply {
                orientation = LinearLayout.HORIZONTAL
                setBackgroundColor(0xF0333333.toInt())
                setPadding(32, 16, 32, 16)
            }
            val text = TextView(context).apply {
                text = message
                textSize = 13f
                setTextColor(0xFFFFFFFF.toInt())
            }
            // 倒计时进度条
            val progress = ProgressBar(context, null, android.R.attr.progressBarStyleHorizontal)
            progress.max = 100
            progress.progress = 100
            progress.layoutParams = LinearLayout.LayoutParams(200, 8).apply {
                setMargins(16, 0, 0, 0)
            }
            container.addView(text)
            container.addView(progress)
            view = container

            windowManager.addView(view, layoutParams)
            Log.d(TAG, "FloatingTip 显示: $message")

            // 倒计时动画（300ms 内 progress 从 100 到 0）
            val steps = 30
            val stepMs = durationMs / steps
            var currentStep = 0
            handler.post(object : Runnable {
                override fun run() {
                    currentStep++
                    progress.progress = 100 - (currentStep * 100 / steps)
                    if (currentStep < steps) {
                        handler.postDelayed(this, stepMs)
                    }
                }
            })

            handler.postDelayed({ dismiss() }, durationMs)
        } catch (e: Exception) {
            Log.e(TAG, "FloatingTip 显示失败: ${e.message}")
        }
    }

    /** 关闭浮窗。 */
    fun dismiss() {
        handler.removeCallbacksAndMessages(null)
        try { view?.let { windowManager.removeView(it) } } catch (_: Exception) {}
        view = null
    }
}

/**
 * 重复账单提示（plan.md「3.8」+ AutoAccounting RepeatToast）。
 * 当检测到重复账单时，轻量提示用户（不弹浮窗，用系统 Toast 风格）。
 */
class RepeatToast(private val context: Context, private val message: String) {
    fun show() {
        val tip = FloatingTip(context, "⚠ $message", FloatingTip.TipPosition.TOP, 2000L)
        tip.show()
        Log.d("RepeatToast", "重复提示: $message")
    }
}