package jp.juggler.subwaytooter.span

import android.graphics.Canvas
import android.graphics.Paint
import android.graphics.Rect
import android.graphics.RectF
import android.graphics.drawable.Drawable
import android.text.style.ReplacementSpan
import androidx.annotation.IntRange
import androidx.collection.LruCache
import androidx.core.content.ContextCompat
import jp.juggler.apng.ApngFrames
import jp.juggler.subwaytooter.App1
import jp.juggler.subwaytooter.R
import jp.juggler.subwaytooter.api.entity.TootInstance
import jp.juggler.subwaytooter.pref.PrefB
import jp.juggler.subwaytooter.pref.lazyContext
import jp.juggler.subwaytooter.table.SavedAccount
import jp.juggler.util.log.LogCategory
import java.lang.ref.WeakReference
import kotlin.math.min

enum class EmojiSizeMode {
    Square,
    Wide,
}

fun SavedAccount?.emojiSizeMode(): EmojiSizeMode {
    val ti = this?.let { TootInstance.getCached(it) }
    return when {
        ti == null -> EmojiSizeMode.Square
        ti.isMisskey || !ti.fedibirdCapabilities.isNullOrEmpty() -> EmojiSizeMode.Wide
        else -> EmojiSizeMode.Square
    }
}

class NetworkEmojiSpan constructor(
    private val url: String,
    private val sizeMode: EmojiSizeMode,
    private val scale: Float = 1f,
    private val errorDrawableId: Int = R.drawable.outline_broken_image_24,
) : ReplacementSpan(), AnimatableSpan {

    companion object {
        internal val log = LogCategory("NetworkEmojiSpan")
        private const val scaleRatio = 1.14f
        private const val descentRatio = 0.211f

        // 最大幅
        var maxEmojiWidth = Float.MAX_VALUE

        // ImageWidthCache
        val imageAspectCache = LruCache<String, Float>(1024)
    }

    private val mPaint = Paint().apply { isFilterBitmap = true }
    private val rectSrc = Rect()
    private val rectDst = RectF()

    // フレーム探索結果を格納する構造体を確保しておく
    private val mFrameFindResult = ApngFrames.FindFrameResult()

    private var invalidateCallback: AnimatableSpanInvalidator? = null

    private var refDrawTarget: WeakReference<Any>? = null

    private var errorDrawableCache: Drawable? = null

    private var lastWidth: Float? = null
    private var transY = 0f
    private var emojiHeight = 0f
    private var emojiWidth = 0f

    /**
     * lastAspect に基づいて rectDst と transY を更新する
     */
    private fun updateRect(aspectArg: Float? = null, textSize: Float, baseline: Float) {
        // テキストサイズをスケーリングした基本高さ
        this.emojiHeight = textSize * scaleRatio * scale

        // ベースラインから上下方向にずらすオフセット
        val cDescent = emojiHeight * descentRatio
        this.transY = baseline - emojiHeight + cDescent

        val aspect = when(aspectArg){
            null ->{
                imageAspectCache[url] ?: 1f
            }
            else->{
                imageAspectCache.put(url,aspectArg)
                aspectArg
            }
        }.takeIf { it>0f }?:1f

        when {
            // 横長画像で、それを許可するモード
            aspect > 1.36f && sizeMode == EmojiSizeMode.Wide -> {
                // 絵文字のアスペクト比から描画範囲の幅と高さを決める
                val dstWidth = min(maxEmojiWidth, aspect * emojiHeight)
                val dstHeight = dstWidth / aspect
                val dstX = 0f
                val dstY = (emojiHeight - dstHeight) / 2f
                rectDst.set(dstX, dstY, dstX + dstWidth, dstY + dstHeight)
                emojiWidth = dstWidth
            }

            else -> {
                emojiWidth = emojiHeight
                // 絵文字のアスペクト比から描画範囲の幅と高さを決める
                val dstWidth: Float
                val dstHeight: Float
                if (aspect >= 1f) {
                    dstWidth = emojiHeight
                    dstHeight = emojiHeight / aspect
                } else {
                    dstHeight = emojiHeight
                    dstWidth = emojiHeight * aspect
                }
                val dstX = (emojiHeight - dstWidth) / 2f
                val dstY = (emojiHeight - dstHeight) / 2f
                rectDst.set(dstX, dstY, dstX + dstWidth, dstY + dstHeight)
            }
        }
        // 出力サイズが変化したならrequestLayout
        val newWidth = rectDst.width()
        if (lastWidth != null && lastWidth != newWidth) {
            log.i("updateRect: width changed. $lastWidth → $newWidth")
            invalidateCallback?.requestLayout()
        }
        lastWidth = newWidth
    }

    override fun setInvalidateCallback(
        drawTargetTag: Any,
        invalidateCallback: AnimatableSpanInvalidator,
    ) {
        this.refDrawTarget = WeakReference(drawTargetTag)
        this.invalidateCallback = invalidateCallback
    }

    override fun getSize(
        paint: Paint,
        text: CharSequence,
        @IntRange(from = 0) start: Int,
        @IntRange(from = 0) end: Int,
        fm: Paint.FontMetricsInt?,
    ): Int {
        updateRect(aspectArg = null, paint.textSize, baseline = 0f)
        val height = (emojiHeight + 0.5f).toInt()
        if (fm != null) {
            val cDescent = (0.5f + height * descentRatio).toInt()
            val cAscent = cDescent - height
            if (fm.ascent > cAscent) fm.ascent = cAscent
            if (fm.top > cAscent) fm.top = cAscent
            if (fm.descent < cDescent) fm.descent = cDescent
            if (fm.bottom < cDescent) fm.bottom = cDescent
        }
        return (emojiWidth + 0.5f).toInt()
    }

    override fun draw(
        canvas: Canvas,
        text: CharSequence,
        start: Int,
        end: Int,
        x: Float,
        top: Int,
        baseline: Int,
        bottom: Int,
        textPaint: Paint,
    ) {
        if (drawFrame(canvas, x, baseline, textPaint)) return
        drawError(canvas, x, baseline, textPaint)
    }

    private fun drawFrame(
        canvas: Canvas,
        x: Float,
        baseline: Int,
        textPaint: Paint,
    ): Boolean {
        val invalidateCallback = this.invalidateCallback
        if (invalidateCallback == null) {
            log.e("draw: invalidate_callback is null.")
            return false
        }

        // APNGデータの取得
        val frames = App1.custom_emoji_cache.getFrames(refDrawTarget, url) {
            invalidateCallback.delayInvalidate(0L)
        } ?: return false

        val t = when {
            PrefB.bpDisableEmojiAnimation.value -> 0L
            else -> invalidateCallback.timeFromStart
        }

        // アニメーション開始時刻からの経過時間に応じたフレームを探索
        frames.findFrame(mFrameFindResult, t)

        val b = mFrameFindResult.bitmap
        if (b == null || b.isRecycled) {
            log.e("draw: bitmap is null or recycled.")
            return false
        }
        val srcWidth = b.width
        val srcHeight = b.height
        if (srcWidth < 1 || srcHeight < 1) {
            log.e("draw: bitmap size is too small.")
            return false
        }
        rectSrc.set(0, 0, srcWidth, srcHeight)
        updateRect(
            aspectArg = srcWidth.toFloat() / srcHeight.toFloat(),
            textPaint.textSize,
            baseline.toFloat()
        )

        canvas.save()
        try {
            canvas.translate(x, transY)
            canvas.drawBitmap(b, rectSrc, rectDst, mPaint)
        } catch (ex: Throwable) {
            log.w(ex, "drawBitmap failed.")

            // 10月6日 18:18（アプリのバージョン: 378） Sony Xperia X Compact（F5321）, Android 8.0
            // 10月6日 11:35（アプリのバージョン: 380） Samsung Galaxy S7 Edge（hero2qltetmo）, Android 8.0
            // 10月2日 21:56（アプリのバージョン: 376） Google Pixel 3（blueline）, Android 9
            //	java.lang.RuntimeException:
            //			at android.graphics.BaseCanvas.throwIfCannotDraw (BaseCanvas.java:55)
            //			at android.view.DisplayListCanvas.throwIfCannotDraw (DisplayListCanvas.java:226)
            //			at android.view.RecordingCanvas.drawBitmap (RecordingCanvas.java:123)
            //			at jp.juggler.subwaytooter.span.NetworkEmojiSpan.draw (NetworkEmojiSpan.kt:137)
        } finally {
            canvas.restore()
        }

        // 少し後に描画しなおす
        val delay = mFrameFindResult.delay
        if (delay != Long.MAX_VALUE && !PrefB.bpDisableEmojiAnimation.value) {
            invalidateCallback.delayInvalidate(delay)
        }
        return true
    }

    private fun drawError(
        canvas: Canvas,
        x: Float,
        baseline: Int,
        textPaint: Paint,
    ) {
        val drawable = errorDrawableCache
            ?: ContextCompat.getDrawable(lazyContext, errorDrawableId)
                ?.also { errorDrawableCache = it }

        drawable ?: return
        val srcWidth = drawable.intrinsicWidth.toFloat()
        val srcHeight = drawable.intrinsicHeight.toFloat()

        updateRect(
            aspectArg = srcWidth / srcHeight,
            textSize = textPaint.textSize,
            baseline = baseline.toFloat()
        )

        canvas.save()
        try {
            canvas.translate(x, transY)
            drawable.setBounds(
                rectDst.left.toInt(),
                rectDst.top.toInt(),
                rectDst.right.plus(0.5f).toInt(),
                rectDst.bottom.plus(0.5f).toInt(),
            )
            drawable.draw(canvas)
        } catch (ex: Throwable) {
            log.w(ex, "drawBitmap failed.")

            // 10月6日 18:18（アプリのバージョン: 378） Sony Xperia X Compact（F5321）, Android 8.0
            // 10月6日 11:35（アプリのバージョン: 380） Samsung Galaxy S7 Edge（hero2qltetmo）, Android 8.0
            // 10月2日 21:56（アプリのバージョン: 376） Google Pixel 3（blueline）, Android 9
            //	java.lang.RuntimeException:
            //			at android.graphics.BaseCanvas.throwIfCannotDraw (BaseCanvas.java:55)
            //			at android.view.DisplayListCanvas.throwIfCannotDraw (DisplayListCanvas.java:226)
            //			at android.view.RecordingCanvas.drawBitmap (RecordingCanvas.java:123)
            //			at jp.juggler.subwaytooter.span.NetworkEmojiSpan.draw (NetworkEmojiSpan.kt:137)
        } finally {
            canvas.restore()
        }
    }
}