package jp.juggler.subwaytooter

import android.content.Context
import android.content.res.ColorStateList
import android.graphics.Color
import android.graphics.PorterDuff
import android.graphics.drawable.*
import android.graphics.drawable.shapes.RectShape
import android.os.Build
import android.support.v4.content.ContextCompat
import android.text.SpannableStringBuilder
import android.text.Spanned
import android.view.View
import android.view.ViewGroup
import android.widget.ImageButton
import android.widget.ImageView
import jp.juggler.subwaytooter.api.entity.TootAccount
import jp.juggler.subwaytooter.api.entity.TootVisibility
import jp.juggler.subwaytooter.span.EmojiImageSpan
import jp.juggler.subwaytooter.table.UserRelation
import jp.juggler.subwaytooter.util.clipRange
import java.util.*

object Styler {
	
	fun getAttributeColor(context : Context, attrId : Int) : Int {
		val theme = context.theme
		val a = theme.obtainStyledAttributes(intArrayOf(attrId))
		val color = a.getColor(0, Color.BLACK)
		a.recycle()
		return color
	}
	
	fun getAttributeResourceId(context : Context, attrId : Int) : Int {
		val theme = context.theme
		val a = theme.obtainStyledAttributes(intArrayOf(attrId))
		val resourceId = a.getResourceId(0, 0)
		a.recycle()
		if(resourceId == 0)
			throw RuntimeException(
				String.format(
					Locale.JAPAN,
					"attr not defined.attr_id=0x%x",
					attrId
				)
			)
		return resourceId
	}
	
	fun getAttributeDrawable(context : Context, attrId : Int) : Drawable {
		val drawableId = getAttributeResourceId(context, attrId)
		val d = ContextCompat.getDrawable(context, drawableId)
		return d ?: throw RuntimeException(
			String.format(
				Locale.JAPAN,
				"getDrawable failed. drawableId=0x%x",
				drawableId
			)
		)
	}
	
	fun createColoredDrawable(
		context : Context,
		drawableId : Int,
		color : Int,
		alphaMultiplier: Float? = null
	) : Drawable {
		val rgb = (color and 0xffffff) or Color.BLACK
		val alpha = if( alphaMultiplier ==null ){
			(color ushr 24)
		}else{
			clipRange(0,255,((color ushr 24).toFloat() * alphaMultiplier +0.5f ).toInt())
		}
		
		// 色指定が他のアイコンに影響しないようにする
		// カラーフィルターとアルファ値を設定する
		val d = ContextCompat.getDrawable(context, drawableId) !!.mutate()
		d.setColorFilter(rgb, PorterDuff.Mode.SRC_ATOP)
		d.alpha = alpha
		
		return d
	}
	
	fun setIconDrawableId(
		context : Context,
		imageView : ImageView,
		drawableId : Int,
		color : Int? = null,
		alphaMultiplier: Float? = null
	) {
		if(color == null) {
			// ImageViewにアイコンを設定する。デフォルトの色
			imageView.setImageDrawable(ContextCompat.getDrawable(context, drawableId))
		} else {
			imageView.setImageDrawable(createColoredDrawable(context, drawableId, color,alphaMultiplier))
		}
	}
	
	fun setIconAttr(
		context : Context,
		imageView : ImageView,
		iconAttrId : Int,
		color : Int? = null,
		alphaMultiplier: Float? = null
	) {
		setIconDrawableId(context, imageView, getAttributeResourceId(context, iconAttrId), color,alphaMultiplier)
	}
	
	fun getVisibilityIconAttr(isMisskeyData : Boolean, visibility : TootVisibility) : Int {
		val isMisskey = when(Pref.ipVisibilityStyle(App1.pref)) {
			Pref.VS_MASTODON -> false
			Pref.VS_MISSKEY -> true
			else -> isMisskeyData
		}
		return when {
			isMisskey -> when(visibility) {
				TootVisibility.Public -> R.attr.ic_public
				TootVisibility.UnlistedHome -> R.attr.btn_home
				TootVisibility.PrivateFollowers -> R.attr.ic_lock_open
				TootVisibility.DirectSpecified -> R.attr.ic_mail
				TootVisibility.DirectPrivate -> R.attr.ic_lock
				TootVisibility.WebSetting -> R.attr.ic_question
				
				TootVisibility.LocalPublic -> R.attr.ic_local_ltl
				TootVisibility.LocalHome -> R.attr.ic_local_home
				TootVisibility.LocalFollowers -> R.attr.ic_local_lock_open
				
			}
			else -> when(visibility) {
				TootVisibility.Public -> R.attr.ic_public
				TootVisibility.UnlistedHome -> R.attr.ic_lock_open
				TootVisibility.PrivateFollowers -> R.attr.ic_lock
				TootVisibility.DirectSpecified -> R.attr.ic_mail
				TootVisibility.DirectPrivate -> R.attr.ic_mail
				TootVisibility.WebSetting -> R.attr.ic_question
				
				TootVisibility.LocalPublic -> R.attr.ic_local_ltl
				TootVisibility.LocalHome -> R.attr.ic_local_lock_open
				TootVisibility.LocalFollowers -> R.attr.ic_local_lock
				
			}
		}
	}
	
	fun getVisibilityIcon(
		context : Context,
		isMisskeyData : Boolean,
		visibility : TootVisibility
	) : Int {
		return getAttributeResourceId(context, getVisibilityIconAttr(isMisskeyData, visibility))
	}
	
	fun getVisibilityString(
		context : Context,
		isMisskeyData : Boolean,
		visibility : TootVisibility
	) : String {
		val isMisskey = when(Pref.ipVisibilityStyle(App1.pref)) {
			Pref.VS_MASTODON -> false
			Pref.VS_MISSKEY -> true
			else -> isMisskeyData
		}
		return context.getString(
			when {
				isMisskey -> when(visibility) {
					TootVisibility.Public -> R.string.visibility_public
					TootVisibility.UnlistedHome -> R.string.visibility_home
					TootVisibility.PrivateFollowers -> R.string.visibility_followers
					TootVisibility.DirectSpecified -> R.string.visibility_direct
					TootVisibility.DirectPrivate -> R.string.visibility_private
					TootVisibility.WebSetting -> R.string.visibility_web_setting
					
					TootVisibility.LocalPublic -> R.string.visibility_local_public
					TootVisibility.LocalHome -> R.string.visibility_local_home
					TootVisibility.LocalFollowers -> R.string.visibility_local_followers
				}
				else -> when(visibility) {
					TootVisibility.Public -> R.string.visibility_public
					TootVisibility.UnlistedHome -> R.string.visibility_unlisted
					TootVisibility.PrivateFollowers -> R.string.visibility_followers
					TootVisibility.DirectSpecified -> R.string.visibility_direct
					TootVisibility.DirectPrivate -> R.string.visibility_direct
					TootVisibility.WebSetting -> R.string.visibility_web_setting
					
					TootVisibility.LocalPublic -> R.string.visibility_local_public
					TootVisibility.LocalHome -> R.string.visibility_local_unlisted
					TootVisibility.LocalFollowers -> R.string.visibility_local_followers
				}
			}
		)
	}
	
	// アイコン付きの装飾テキストを返す
	fun getVisibilityCaption(
		context : Context,
		isMisskeyData : Boolean,
		visibility : TootVisibility
	) : CharSequence {
		
		val icon_id = getVisibilityIcon(context, isMisskeyData, visibility)
		val sv = getVisibilityString(context, isMisskeyData, visibility)
		
		val sb = SpannableStringBuilder()
		
		// アイコン部分
		val start = sb.length
		sb.append(" ")
		val end = sb.length
		sb.setSpan(EmojiImageSpan(context, icon_id), start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE)
		
		// 文字列部分
		sb.append(' ')
		sb.append(sv)
		
		return sb
	}
	
	fun setFollowIcon(
		context : Context
		, ibFollow : ImageButton
		, ivDot : ImageView
		, relation : UserRelation
		, who : TootAccount
		, defaultColor : Int
		,alphaMultiplier : Float? = null
	) {
		
		fun colorError() = Styler.getAttributeColor(context, R.attr.colorRegexFilterError)
		fun colorAccent() = Styler.getAttributeColor(context, R.attr.colorImageButtonAccent)
		
		// 被フォロー状態
		when {
			
			relation.blocked_by -> {
				ivDot.visibility = View.VISIBLE
				setIconDrawableId(context, ivDot, R.drawable.ic_blocked_by, color = colorError(),alphaMultiplier = alphaMultiplier)
			}
			
			relation.requested_by -> {
				ivDot.visibility = View.VISIBLE
				setIconDrawableId(context, ivDot, R.drawable.ic_requested_by, color = colorError(),alphaMultiplier = alphaMultiplier)
			}
			
			relation.followed_by -> {
				ivDot.visibility = View.VISIBLE
				setIconAttr(context, ivDot, R.attr.ic_followed_by, color = colorAccent(),alphaMultiplier = alphaMultiplier)
				// 被フォローリクエスト状態の時に followed_by が 真と偽の両方がありえるようなので
				// Relationshipだけを見ても被フォローリクエスト状態は分からないっぽい
				// 仕方ないので馬鹿正直に「 followed_byが真ならバッジをつける」しかできない
			}
			
			else -> {
				ivDot.visibility = View.GONE
			}
		}
		
		// フォローボタン
		// follow button
		val color : Int
		val icon_attr : Int
		val contentDescription : String
		
		when {
			relation.blocking -> {
				icon_attr = R.attr.ic_block
				color = defaultColor
				contentDescription = context.getString(R.string.follow)
			}
			
			relation.muting -> {
				icon_attr = R.attr.ic_mute
				color = defaultColor
				contentDescription = context.getString(R.string.follow)
			}
			
			relation.getFollowing(who) -> {
				icon_attr = R.attr.ic_follow_cross
				color = colorAccent()
				contentDescription = context.getString(R.string.unfollow)
			}
			
			relation.getRequested(who) -> {
				icon_attr = R.attr.ic_follow_wait
				color = colorError()
				contentDescription = context.getString(R.string.unfollow)
			}
			
			else -> {
				icon_attr = R.attr.ic_follow_plus
				color = defaultColor
				contentDescription = context.getString(R.string.follow)
			}
		}
		
		setIconAttr(context, ibFollow, icon_attr, color = color,alphaMultiplier = alphaMultiplier)
		ibFollow.contentDescription = contentDescription
	}
	
	// 色を指定してRippleDrawableを生成する
	fun getAdaptiveRippleDrawable(normalColor : Int, pressedColor : Int) : Drawable {
		return if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
			RippleDrawable(
				ColorStateList.valueOf(pressedColor), getRectShape(normalColor), null
			)
		} else {
			getStateListDrawable(normalColor, pressedColor)
		}
	}
	
	// 色を指定してRectShapeを生成する
	private fun getRectShape(color : Int) : Drawable {
		val r = RectShape()
		val shapeDrawable = ShapeDrawable(r)
		shapeDrawable.paint.color = color
		return shapeDrawable
	}
	
	// 後方互換用にボタン背景Drawableを生成する
	private fun getStateListDrawable(normalColor : Int, pressedColor : Int) : StateListDrawable {
		val states = StateListDrawable()
		states.addState(intArrayOf(android.R.attr.state_pressed), ColorDrawable(pressedColor))
		states.addState(intArrayOf(android.R.attr.state_focused), ColorDrawable(pressedColor))
		states.addState(intArrayOf(android.R.attr.state_activated), ColorDrawable(pressedColor))
		states.addState(intArrayOf(), ColorDrawable(normalColor))
		return states
	}
	
	private fun getHorizontalPadding(v : View, delta_dp : Float) : Int {
		val form_width_max = 420f
		val dm = v.resources.displayMetrics
		val screen_w = dm.widthPixels
		val content_w = (0.5f + form_width_max * dm.density).toInt()
		val pad_lr = (screen_w - content_w) / 2
		return (if(pad_lr < 0) 0 else pad_lr) + (0.5f + delta_dp * dm.density).toInt()
	}
	
	fun fixHorizontalPadding(v : View) {
		val pad_lr = getHorizontalPadding(v, 12f)
		val pad_t = v.paddingTop
		val pad_b = v.paddingBottom
		v.setPaddingRelative(pad_lr, pad_t, pad_lr, pad_b)
	}
	
	fun fixHorizontalPadding2(v : View) {
		val pad_lr = getHorizontalPadding(v, 0f)
		val pad_t = v.paddingTop
		val pad_b = v.paddingBottom
		v.setPaddingRelative(pad_lr, pad_t, pad_lr, pad_b)
	}
	
	fun fixHorizontalMargin(v : View) {
		val pad_lr = getHorizontalPadding(v, 0f)
		val lp = v.layoutParams
		if(lp is ViewGroup.MarginLayoutParams) {
			lp.leftMargin = pad_lr
			lp.rightMargin = pad_lr
		}
	}
	
	// ActMainの初期化時に更新される
	var round_ratio : Float = 0.33f * 0.5f
	var boost_alpha : Float? = null
	
	fun calcIconRound(wh : Int) = wh.toFloat() * round_ratio
	
	fun calcIconRound(lp : ViewGroup.LayoutParams) =
		Math.min(lp.width, lp.height).toFloat() * round_ratio
	
}

fun SpannableStringBuilder.appendColorShadeIcon(
	context : Context,
	drawable_id : Int,
	text : String,
	color : Int? = null
) : SpannableStringBuilder {
	val start = this.length
	this.append(text)
	val end = this.length
	this.setSpan(
		EmojiImageSpan(context, drawable_id, useColorShader = true, color = color),
		start,
		end,
		Spanned.SPAN_EXCLUSIVE_EXCLUSIVE
	)
	return this
}

fun SpannableStringBuilder.appendDrawableIcon(
	context : Context,
	drawable_id : Int,
	text : String
) : SpannableStringBuilder {
	val start = this.length
	this.append(text)
	val end = this.length
	this.setSpan(
		EmojiImageSpan(context, drawable_id),
		start,
		end,
		Spanned.SPAN_EXCLUSIVE_EXCLUSIVE
	)
	return this
}