package com.quillstudios.pokegoalshelper.ui

import android.animation.ObjectAnimator
import android.animation.ValueAnimator
import android.animation.AnimatorListenerAdapter
import android.animation.Animator
import android.content.Context
import android.graphics.PixelFormat
import android.graphics.drawable.GradientDrawable
import android.os.Build
import android.util.TypedValue
import android.view.*
import android.view.animation.AccelerateDecelerateInterpolator
import android.widget.*
import androidx.core.content.ContextCompat
import com.quillstudios.pokegoalshelper.R
import com.quillstudios.pokegoalshelper.models.DetectionResult
import com.quillstudios.pokegoalshelper.utils.PGHLog
import java.time.format.DateTimeFormatter
import kotlin.math.abs

/**
 * Bottom drawer that slides up to display detection results immediately after capture.
 * 
 * Features:
 * - Slides up from bottom with smooth animation
 * - Shows Pokemon detection results with formatted data
 * - Auto-dismiss after timeout or manual dismiss
 * - Expandable for more details
 * - Gesture handling for swipe dismiss
 */
class ResultsBottomDrawer(private val context: Context)
{
    companion object
    {
        private const val TAG = "ResultsBottomDrawer"
        private const val DRAWER_HEIGHT_DP = 120
        private const val SLIDE_ANIMATION_DURATION = 300L
        private const val AUTO_DISMISS_DELAY = 5000L // 5 seconds
        private const val SWIPE_THRESHOLD = 100f
    }
    
    private var windowManager: WindowManager? = null
    private var drawerContainer: LinearLayout? = null
    private var drawerParams: WindowManager.LayoutParams? = null
    private var isShowing = false
    private var isDragging = false
    private var autoDismissRunnable: Runnable? = null
    
    // Touch handling
    private var initialTouchY = 0f
    private var initialTranslationY = 0f
    
    fun show(result: DetectionResult)
    {
        if (isShowing) return
        
        try
        {
            windowManager = context.getSystemService(Context.WINDOW_SERVICE) as WindowManager
            createDrawerView(result)
            isShowing = true
            
            // Schedule auto-dismiss
            scheduleAutoDismiss()
            
            PGHLog.d(TAG, "Bottom drawer shown for detection: ${result.id}")
        }
        catch (e: Exception)
        {
            PGHLog.e(TAG, "Failed to show bottom drawer", e)
        }
    }
    
    fun hide()
    {
        if (!isShowing) return
        
        try
        {
            // Cancel auto-dismiss
            autoDismissRunnable?.let { android.os.Handler().removeCallbacks(it) }
            
            // Animate out
            animateOut {
                try
                {
                    drawerContainer?.let { windowManager?.removeView(it) }
                    cleanup()
                }
                catch (e: Exception)
                {
                    PGHLog.e(TAG, "Error removing drawer view", e)
                }
            }
            
            PGHLog.d(TAG, "Bottom drawer hidden")
        }
        catch (e: Exception)
        {
            PGHLog.e(TAG, "Failed to hide bottom drawer", e)
        }
    }
    
    private fun createDrawerView(result: DetectionResult)
    {
        val screenSize = getScreenSize()
        val drawerHeight = dpToPx(DRAWER_HEIGHT_DP)
        
        // Create main container
        drawerContainer = LinearLayout(context).apply {
            orientation = LinearLayout.VERTICAL
            background = createDrawerBackground()
            gravity = Gravity.CENTER_HORIZONTAL
            setPadding(dpToPx(16), dpToPx(12), dpToPx(16), dpToPx(16))
            
            // Add drag handle
            addView(createDragHandle())
            
            // Add result content
            addView(createResultContent(result))
            
            // Set up touch handling for swipe dismiss
            setOnTouchListener(createSwipeTouchListener())
        }
        
        // Create window parameters
        drawerParams = WindowManager.LayoutParams(
            WindowManager.LayoutParams.MATCH_PARENT,
            drawerHeight,
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
            {
                WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY
            }
            else
            {
                @Suppress("DEPRECATION")
                WindowManager.LayoutParams.TYPE_PHONE
            },
            WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE or
            WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL or
            WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS,
            PixelFormat.TRANSLUCENT
        ).apply {
            gravity = Gravity.BOTTOM
            y = 0
        }
        
        // Add to window manager
        windowManager?.addView(drawerContainer, drawerParams)
        
        // Animate in
        animateIn()
    }
    
    private fun createDragHandle(): View
    {
        return View(context).apply {
            background = GradientDrawable().apply {
                setColor(ContextCompat.getColor(context, android.R.color.darker_gray))
                cornerRadius = dpToPx(2).toFloat()
            }
            
            layoutParams = LinearLayout.LayoutParams(
                dpToPx(40),
                dpToPx(4)
            ).apply {
                setMargins(0, 0, 0, dpToPx(8))
            }
        }
    }
    
    private fun createResultContent(result: DetectionResult): LinearLayout
    {
        return LinearLayout(context).apply {
            orientation = LinearLayout.HORIZONTAL
            gravity = Gravity.CENTER_VERTICAL
            
            // Status icon
            val statusIcon = ImageView(context).apply {
                setImageResource(
                    if (result.success) android.R.drawable.ic_menu_myplaces 
                    else android.R.drawable.ic_dialog_alert
                )
                setColorFilter(
                    ContextCompat.getColor(
                        context,
                        if (result.success) android.R.color.holo_green_light
                        else android.R.color.holo_red_light
                    )
                )
                layoutParams = LinearLayout.LayoutParams(
                    dpToPx(24),
                    dpToPx(24)
                ).apply {
                    setMargins(0, 0, dpToPx(12), 0)
                }
            }
            
            // Content container
            val contentContainer = LinearLayout(context).apply {
                orientation = LinearLayout.VERTICAL
                layoutParams = LinearLayout.LayoutParams(
                    0,
                    ViewGroup.LayoutParams.WRAP_CONTENT,
                    1f
                )
            }
            
            if (result.success && result.pokemonInfo != null)
            {
                // Pokemon found - show details
                val pokemonInfo = result.pokemonInfo
                
                // Pokemon name and CP
                val titleText = buildString {
                    append(pokemonInfo.name ?: "Unknown Pokemon")
                    pokemonInfo.cp?.let { append(" (CP $it)") }
                }
                
                val titleView = TextView(context).apply {
                    text = titleText
                    setTextSize(TypedValue.COMPLEX_UNIT_SP, 16f)
                    setTextColor(ContextCompat.getColor(context, android.R.color.white))
                    typeface = android.graphics.Typeface.DEFAULT_BOLD
                }
                
                // Additional details
                val detailsText = buildString {
                    pokemonInfo.level?.let { append("Level ${String.format("%.1f", it)}") }
                    pokemonInfo.stats?.perfectIV?.let { 
                        if (isNotEmpty()) append(" • ")
                        append("${String.format("%.1f", it)}% IV")
                    }
                    pokemonInfo.hp?.let {
                        if (isNotEmpty()) append(" • ")
                        append("${it} HP")
                    }
                }
                
                val detailsView = TextView(context).apply {
                    text = detailsText
                    setTextSize(TypedValue.COMPLEX_UNIT_SP, 12f)
                    setTextColor(ContextCompat.getColor(context, android.R.color.darker_gray))
                }
                
                contentContainer.addView(titleView)
                if (detailsText.isNotEmpty())
                {
                    contentContainer.addView(detailsView)
                }
            }
            else
            {
                // Detection failed or no Pokemon found
                val titleView = TextView(context).apply {
                    text = if (result.success) "No Pokemon detected" else "Detection failed"
                    setTextSize(TypedValue.COMPLEX_UNIT_SP, 16f)
                    setTextColor(ContextCompat.getColor(context, android.R.color.white))
                    typeface = android.graphics.Typeface.DEFAULT_BOLD
                }
                
                val detailsView = TextView(context).apply {
                    text = result.errorMessage ?: "Try again with a clearer view"
                    setTextSize(TypedValue.COMPLEX_UNIT_SP, 12f)
                    setTextColor(ContextCompat.getColor(context, android.R.color.darker_gray))
                }
                
                contentContainer.addView(titleView)
                contentContainer.addView(detailsView)
            }
            
            // Processing time and timestamp
            val metaText = buildString {
                append("${result.processingTimeMs}ms")
                append(" • ")
                append(result.timestamp.format(DateTimeFormatter.ofPattern("HH:mm:ss")))
            }
            
            val metaView = TextView(context).apply {
                text = metaText
                setTextSize(TypedValue.COMPLEX_UNIT_SP, 10f)
                setTextColor(ContextCompat.getColor(context, android.R.color.darker_gray))
            }
            
            contentContainer.addView(metaView)
            
            // Dismiss button
            val dismissButton = ImageButton(context).apply {
                setImageResource(android.R.drawable.ic_menu_close_clear_cancel)
                background = createCircularBackground()
                setColorFilter(ContextCompat.getColor(context, android.R.color.white))
                setOnClickListener { hide() }
                
                layoutParams = LinearLayout.LayoutParams(
                    dpToPx(32),
                    dpToPx(32)
                ).apply {
                    setMargins(dpToPx(12), 0, 0, 0)
                }
            }
            
            addView(statusIcon)
            addView(contentContainer)
            addView(dismissButton)
        }
    }
    
    private fun createDrawerBackground(): GradientDrawable
    {
        return GradientDrawable().apply {
            setColor(ContextCompat.getColor(context, android.R.color.black))
            alpha = (0.9f * 255).toInt()
            cornerRadii = floatArrayOf(
                dpToPx(12).toFloat(), dpToPx(12).toFloat(), // top-left
                dpToPx(12).toFloat(), dpToPx(12).toFloat(), // top-right
                0f, 0f, // bottom-right
                0f, 0f  // bottom-left
            )
            setStroke(2, ContextCompat.getColor(context, android.R.color.darker_gray))
        }
    }
    
    private fun createCircularBackground(): GradientDrawable
    {
        return GradientDrawable().apply {
            setColor(ContextCompat.getColor(context, android.R.color.transparent))
            shape = GradientDrawable.OVAL
            setStroke(1, ContextCompat.getColor(context, android.R.color.darker_gray))
        }
    }
    
    private fun createSwipeTouchListener(): View.OnTouchListener
    {
        return View.OnTouchListener { view, event ->
            when (event.action)
            {
                MotionEvent.ACTION_DOWN ->
                {
                    isDragging = false
                    initialTouchY = event.rawY
                    initialTranslationY = view.translationY
                    
                    // Cancel auto-dismiss while user is interacting
                    autoDismissRunnable?.let { android.os.Handler().removeCallbacks(it) }
                    true
                }
                
                MotionEvent.ACTION_MOVE ->
                {
                    val deltaY = event.rawY - initialTouchY
                    
                    if (!isDragging && abs(deltaY) > 20)
                    {
                        isDragging = true
                    }
                    
                    if (isDragging && deltaY > 0)
                    {
                        // Only allow downward drag (dismissing)
                        view.translationY = initialTranslationY + deltaY
                    }
                    true
                }
                
                MotionEvent.ACTION_UP ->
                {
                    if (isDragging)
                    {
                        val deltaY = event.rawY - initialTouchY
                        if (deltaY > SWIPE_THRESHOLD)
                        {
                            // Dismiss if swiped down enough
                            hide()
                        }
                        else
                        {
                            // Snap back
                            ObjectAnimator.ofFloat(view, "translationY", view.translationY, initialTranslationY).apply {
                                duration = 200L
                                interpolator = AccelerateDecelerateInterpolator()
                                start()
                            }
                            
                            // Restart auto-dismiss
                            scheduleAutoDismiss()
                        }
                    }
                    else
                    {
                        // Restart auto-dismiss on tap
                        scheduleAutoDismiss()
                    }
                    
                    isDragging = false
                    true
                }
                
                else -> false
            }
        }
    }
    
    private fun animateIn()
    {
        drawerContainer?.let { container ->
            val screenHeight = getScreenSize().second
            container.translationY = dpToPx(DRAWER_HEIGHT_DP).toFloat()
            
            ObjectAnimator.ofFloat(container, "translationY", container.translationY, 0f).apply {
                duration = SLIDE_ANIMATION_DURATION
                interpolator = AccelerateDecelerateInterpolator()
                start()
            }
        }
    }
    
    private fun animateOut(onComplete: () -> Unit)
    {
        drawerContainer?.let { container ->
            ObjectAnimator.ofFloat(container, "translationY", 0f, dpToPx(DRAWER_HEIGHT_DP).toFloat()).apply {
                duration = SLIDE_ANIMATION_DURATION
                interpolator = AccelerateDecelerateInterpolator()
                addListener(object : AnimatorListenerAdapter() {
                    override fun onAnimationEnd(animation: Animator) {
                        onComplete()
                    }
                })
                start()
            }
        }
    }
    
    private fun scheduleAutoDismiss()
    {
        autoDismissRunnable?.let { android.os.Handler().removeCallbacks(it) }
        
        autoDismissRunnable = Runnable { hide() }
        android.os.Handler().postDelayed(autoDismissRunnable!!, AUTO_DISMISS_DELAY)
    }
    
    private fun cleanup()
    {
        drawerContainer = null
        drawerParams = null
        windowManager = null
        isShowing = false
        autoDismissRunnable?.let { android.os.Handler().removeCallbacks(it) }
        autoDismissRunnable = null
    }
    
    private fun getScreenSize(): Pair<Int, Int>
    {
        val displayMetrics = context.resources.displayMetrics
        return Pair(displayMetrics.widthPixels, displayMetrics.heightPixels)
    }
    
    private fun dpToPx(dp: Int): Int
    {
        return TypedValue.applyDimension(
            TypedValue.COMPLEX_UNIT_DIP,
            dp.toFloat(),
            context.resources.displayMetrics
        ).toInt()
    }
}