package com.swmansion.rnscreens

import android.content.Context
import android.graphics.PorterDuff
import android.graphics.PorterDuffColorFilter
import android.text.TextUtils
import android.util.TypedValue
import android.view.Gravity
import android.view.View.OnClickListener
import android.widget.ImageView
import android.widget.TextView
import androidx.appcompat.app.ActionBar
import androidx.appcompat.app.AppCompatActivity
import androidx.appcompat.widget.Toolbar
import androidx.fragment.app.Fragment
import com.facebook.react.ReactApplication
import com.facebook.react.bridge.JSApplicationIllegalArgumentException
import com.facebook.react.bridge.ReactContext
import com.facebook.react.uimanager.ReactPointerEventsView
import com.facebook.react.uimanager.UIManagerHelper
import com.facebook.react.views.text.ReactTypefaceUtils
import com.swmansion.rnscreens.events.HeaderAttachedEvent
import com.swmansion.rnscreens.events.HeaderDetachedEvent
import kotlin.math.max
import kotlin.properties.Delegates

class ScreenStackHeaderConfig(
    context: Context,
    private val pointerEventsImpl: ReactPointerEventsView,
) : FabricEnabledHeaderConfigViewGroup(context),
    ReactPointerEventsView by pointerEventsImpl {
    constructor(context: Context) : this(context, pointerEventsImpl = PointerEventsBoxNoneImpl())

    private val configSubviews = ArrayList<ScreenStackHeaderSubview>(3)
    val toolbar: CustomToolbar
    var isHeaderHidden = false // named this way to avoid conflict with platform's isHidden
    var isHeaderTranslucent =
        false // named this way to avoid conflict with platform's isTranslucent

    var consumeTopInset by Delegates.observable(false) { _, oldValue, newValue ->
        if (oldValue != newValue && isAttachedToWindow) {
            toolbar.requestApplyInsets()
        }
    }

    var legacyTopInsetBehavior by Delegates.observable(false) { _, oldValue, newValue ->
        if (oldValue != newValue && isAttachedToWindow) {
            toolbar.requestApplyInsets()
        }
    }

    private var title: String? = null
    private var titleColor = 0
    private var titleFontFamily: String? = null
    private var direction: String? = null
    private var titleFontSize = 0f
    private var titleFontWeight = 0
    private var backgroundColor: Int? = null
    private var isBackButtonHidden = false
    private var isShadowHidden = false
    private var isDestroyed = false
    private var actionBar: ActionBar? = null
    private var backButtonInCustomView = false
    private var tintColor = 0
    private var isAttachedToWindow = false
    private val defaultStartInset: Int
    private val defaultStartInsetWithNavigation: Int
    private val backClickListener =
        OnClickListener {
            screenFragment?.let {
                val stack = screenStack
                if (stack != null && stack.rootScreen == it.screen) {
                    val parentFragment = it.parentFragment
                    if (parentFragment is ScreenStackFragment) {
                        if (parentFragment.screen.nativeBackButtonDismissalEnabled) {
                            parentFragment.dismissFromContainer()
                        } else {
                            parentFragment.dispatchHeaderBackButtonClickedEvent()
                        }
                    }
                } else {
                    if (it.screen.nativeBackButtonDismissalEnabled) {
                        it.dismissFromContainer()
                    } else {
                        it.dispatchHeaderBackButtonClickedEvent()
                    }
                }
            }
        }

    var isTitleEmpty: Boolean = false

    val preferredContentInsetStart
        get() = defaultStartInset

    val preferredContentInsetEnd
        get() = defaultStartInset

    val preferredContentInsetStartWithNavigation
        get() =
            // Reset toolbar insets. By default we set symmetric inset for start and end to match iOS
            // implementation where both right and left icons are offset from the edge by default. We also
            // reset startWithNavigation inset which corresponds to the distance between navigation icon and
            // title. If title isn't set we clear that value few lines below to give more space to custom
            // center-mounted views.
            if (isTitleEmpty) {
                0
            } else {
                defaultStartInsetWithNavigation
            }

    val headerHeightUpdateProxy = ScreenStackHeaderHeightUpdateProxy()

    fun destroy() {
        isDestroyed = true
    }

    internal fun clearActionBarIfOwned(activity: AppCompatActivity?) {
        actionBar?.let { ownedActionBar ->
            activity?.let { appCompat ->
                if (appCompat.supportActionBar === ownedActionBar) {
                    appCompat.setSupportActionBar(null)
                }
            }
        }
        actionBar = null
    }

    /**
     * Native toolbar should notify the header config component that it has completed its layout.
     */
    fun onNativeToolbarLayout(
        toolbar: Toolbar,
        shouldUpdateShadowStateHint: Boolean,
    ) {
        if (!shouldUpdateShadowStateHint) {
            return
        }

        val isBackButtonDisplayed = toolbar.navigationIcon != null

        val contentInsetStartEstimation =
            if (isBackButtonDisplayed) {
                toolbar.currentContentInsetStart + toolbar.paddingStart
            } else {
                max(toolbar.currentContentInsetStart, toolbar.paddingStart)
            }

        // Assuming that there is nothing to the left of back button here, the content
        // offset we're interested in in ShadowTree is the `left` of the subview left.
        // In case it is not available we fallback to approximation.
        val contentInsetStart =
            configSubviews.firstOrNull { it.type === ScreenStackHeaderSubview.Type.LEFT }?.left
                ?: contentInsetStartEstimation

        val contentInsetEnd = toolbar.currentContentInsetEnd + toolbar.paddingEnd

        headerHeightUpdateProxy.updateHeaderHeightIfNeeded(this, screen)

        updateHeaderConfigState(
            toolbar.width,
            toolbar.height,
            contentInsetStart,
            contentInsetEnd,
        )
    }

    override fun onLayout(
        changed: Boolean,
        l: Int,
        t: Int,
        r: Int,
        b: Int,
    ) = Unit

    override fun onAttachedToWindow() {
        super.onAttachedToWindow()
        isAttachedToWindow = true
        val surfaceId = UIManagerHelper.getSurfaceId(this)
        UIManagerHelper
            .getEventDispatcherForReactTag(context as ReactContext, id)
            ?.dispatchEvent(HeaderAttachedEvent(surfaceId, id))
        onUpdate()
    }

    override fun onDetachedFromWindow() {
        super.onDetachedFromWindow()
        isAttachedToWindow = false
        val surfaceId = UIManagerHelper.getSurfaceId(this)
        UIManagerHelper
            .getEventDispatcherForReactTag(context as ReactContext, id)
            ?.dispatchEvent(HeaderDetachedEvent(surfaceId, id))
    }

    private val screen: Screen?
        get() = parent as? Screen

    private val screenStack: ScreenStack?
        get() = screen?.container as? ScreenStack

    val screenFragment: ScreenStackFragment?
        get() {
            val screen = parent
            if (screen is Screen) {
                val fragment: Fragment? = screen.fragment
                if (fragment is ScreenStackFragment) {
                    return fragment
                }
            }
            return null
        }

    fun onUpdate() {
        val stack = screenStack
        val isTop = stack == null || stack.topScreen == parent

        if (!isAttachedToWindow || !isTop || isDestroyed) {
            return
        }

        val activity = screenFragment?.activity as AppCompatActivity? ?: return
        if (direction != null) {
            if (direction == "rtl") {
                toolbar.layoutDirection = LAYOUT_DIRECTION_RTL
            } else if (direction == "ltr") {
                toolbar.layoutDirection = LAYOUT_DIRECTION_LTR
            }
        }

        // orientation and status bar management
        screen?.let {
            // we set the traits here too, not only when the prop for Screen is passed
            // because sometimes we don't have the Fragment and Activity available then yet, e.g. on the
            // first setting of props. Similar thing is done for Screens of ScreenContainers, but in
            // `onContainerUpdate` of their Fragment
            val reactContext =
                if (context is ReactContext) {
                    context as ReactContext
                } else {
                    it.fragmentWrapper?.tryGetContext()
                }
            ScreenWindowTraits.trySetWindowTraits(it, activity, reactContext)
        }

        if (isHeaderHidden) {
            if (toolbar.parent != null) {
                screenFragment?.removeToolbar()
            }
            headerHeightUpdateProxy.updateHeaderHeightIfNeeded(this, screen)
            return
        }

        if (toolbar.parent == null) {
            screenFragment?.setToolbar(toolbar)
        }

        activity.setSupportActionBar(toolbar)
        // non-null toolbar is set in the line above and it is used here
        val newActionBar = requireNotNull(activity.supportActionBar)
        actionBar = newActionBar

        // hide back button
        newActionBar.setDisplayHomeAsUpEnabled(
            screenFragment?.canNavigateBack() == true && !isBackButtonHidden,
        )

        // title
        newActionBar.title = title
        if (TextUtils.isEmpty(title)) {
            isTitleEmpty = true
        }

        // Reset toolbar insets. By default we set symmetric inset for start and end to match iOS
        // implementation where both right and left icons are offset from the edge by default. We also
        // reset startWithNavigation inset which corresponds to the distance between navigation icon and
        // title. If title isn't set we clear that value few lines below to give more space to custom
        // center-mounted views.
        toolbar.updateContentInsets()

        // when setSupportActionBar is called a toolbar wrapper gets initialized that overwrites
        // navigation click listener. The default behavior set in the wrapper is to call into
        // menu options handlers, but we prefer the back handling logic to stay here instead.
        toolbar.setNavigationOnClickListener(backClickListener)

        // shadow
        screenFragment?.setToolbarShadowHidden(isShadowHidden)

        // translucent
        screenFragment?.setToolbarTranslucent(isHeaderTranslucent)

        val titleTextView = findTitleTextViewInToolbar(toolbar)
        if (titleColor != 0) {
            toolbar.setTitleTextColor(titleColor)
        }

        if (titleTextView != null) {
            if (titleFontFamily != null || titleFontWeight > 0) {
                val titleTypeface =
                    ReactTypefaceUtils.applyStyles(
                        null,
                        0,
                        titleFontWeight,
                        titleFontFamily,
                        context.assets,
                    )
                titleTextView.typeface = titleTypeface
            }
            if (titleFontSize > 0) {
                titleTextView.textSize = titleFontSize
            }
        }

        // background
        backgroundColor?.let { toolbar.setBackgroundColor(it) }

        // color
        if (tintColor != 0) {
            toolbar.navigationIcon?.colorFilter =
                PorterDuffColorFilter(tintColor, PorterDuff.Mode.SRC_ATOP)
        }

        // subviews
        for (i in toolbar.childCount - 1 downTo 0) {
            if (toolbar.getChildAt(i) is ScreenStackHeaderSubview) {
                toolbar.removeViewAt(i)
            }
        }

        var i = 0
        val size = configSubviews.size
        while (i < size) {
            val view = configSubviews[i]
            val type = view.type
            if (type === ScreenStackHeaderSubview.Type.BACK) {
                // we special case BACK button header config type as we don't add it as a view into toolbar
                // but instead just copy the drawable from imageview that's added as a first child to it.
                val firstChild =
                    view.getChildAt(0) as? ImageView
                        ?: throw JSApplicationIllegalArgumentException(
                            "Back button header config view should have Image as first child",
                        )
                newActionBar.setHomeAsUpIndicator(firstChild.drawable)
                i++
                continue
            }
            val params = Toolbar.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT)
            when (type) {
                ScreenStackHeaderSubview.Type.LEFT -> {
                    // when there is a left item we need to disable navigation icon by default
                    // we also hide title as there is no other way to display left side items
                    if (!backButtonInCustomView) {
                        toolbar.navigationIcon = null
                    }
                    toolbar.title = null
                    params.gravity = Gravity.START
                }

                ScreenStackHeaderSubview.Type.RIGHT -> params.gravity = Gravity.END
                ScreenStackHeaderSubview.Type.CENTER -> {
                    params.width = LayoutParams.MATCH_PARENT
                    params.gravity = Gravity.CENTER_HORIZONTAL
                    toolbar.title = null
                }

                else -> {}
            }
            view.layoutParams = params
            toolbar.addView(view)
            i++
        }

        headerHeightUpdateProxy.updateHeaderHeightIfNeeded(this, screen)
    }

    private fun maybeUpdate() {
        if (parent != null && !isDestroyed && screen?.isBeingRemoved == false) {
            onUpdate()
        }
    }

    fun getConfigSubview(index: Int): ScreenStackHeaderSubview = configSubviews[index]

    val configSubviewsCount: Int
        get() = configSubviews.size

    fun removeConfigSubview(index: Int) {
        configSubviews.removeAt(index)
        maybeUpdate()
    }

    fun removeAllConfigSubviews() {
        configSubviews.clear()
        maybeUpdate()
    }

    fun addConfigSubview(
        child: ScreenStackHeaderSubview,
        index: Int,
    ) {
        configSubviews.add(index, child)
        maybeUpdate()
    }

    fun setTitle(title: String?) {
        this.title = title
    }

    fun setTitleFontFamily(titleFontFamily: String?) {
        this.titleFontFamily = titleFontFamily
    }

    fun setTitleFontWeight(fontWeightString: String?) {
        titleFontWeight = ReactTypefaceUtils.parseFontWeight(fontWeightString)
    }

    fun setTitleFontSize(titleFontSize: Float) {
        this.titleFontSize = titleFontSize
    }

    fun setTitleColor(color: Int) {
        titleColor = color
    }

    fun setTintColor(color: Int) {
        tintColor = color
    }

    fun setBackgroundColor(color: Int?) {
        backgroundColor = color
    }

    fun setHideShadow(hideShadow: Boolean) {
        isShadowHidden = hideShadow
    }

    fun setHideBackButton(hideBackButton: Boolean) {
        isBackButtonHidden = hideBackButton
    }

    fun setHidden(hidden: Boolean) {
        isHeaderHidden = hidden
    }

    fun setTranslucent(translucent: Boolean) {
        isHeaderTranslucent = translucent
    }

    fun setBackButtonInCustomView(backButtonInCustomView: Boolean) {
        this.backButtonInCustomView = backButtonInCustomView
    }

    fun setDirection(direction: String?) {
        this.direction = direction
    }

    private class DebugMenuToolbar(
        context: Context,
        config: ScreenStackHeaderConfig,
    ) : CustomToolbar(context, config) {
        override fun showOverflowMenu(): Boolean {
            (context.applicationContext as ReactApplication)
                .reactHost
                ?.devSupportManager
                ?.showDevOptionsDialog()
            return true
        }
    }

    init {
        visibility = GONE
        toolbar =
            if (BuildConfig.DEBUG) DebugMenuToolbar(context, this) else CustomToolbar(context, this)
        defaultStartInset = toolbar.contentInsetStart
        defaultStartInsetWithNavigation = toolbar.contentInsetStartWithNavigation

        // set primary color as background by default
        val tv = TypedValue()
        if (context.theme.resolveAttribute(android.R.attr.colorPrimary, tv, true)) {
            toolbar.setBackgroundColor(tv.data)
        }
        toolbar.clipChildren = false
    }

    companion object {
        fun findTitleTextViewInToolbar(toolbar: Toolbar): TextView? {
            for (i in 0 until toolbar.childCount) {
                val view = toolbar.getChildAt(i)
                if (view is TextView) {
                    if (TextUtils.equals(view.text, toolbar.title)) {
                        return view
                    }
                }
            }
            return null
        }
    }
}