/*
 * Copyright (c) 2017-present Robert Jaros
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package pl.treksoft.kvision.onsenui.tabbar

import com.github.snabbdom.VNode
import pl.treksoft.kvision.core.StringPair
import pl.treksoft.kvision.core.Widget
import pl.treksoft.kvision.onsenui.core.Page
import pl.treksoft.kvision.panel.SimplePanel
import pl.treksoft.kvision.utils.obj
import pl.treksoft.kvision.utils.set
import kotlin.js.Promise

/**
 * Tab bar position.
 */
enum class TabsPosition(internal val type: String) {
    AUTO("auto"),
    TOP("top"),
    BOTTOM("bottom")
}

/**
 * A tab bar component.
 *
 * @constructor Creates a tab bar component.
 * @param tabPosition the tab bar position
 * @param animation determines if the transitions are animated
 * @param swipeable determines if the tab bar can be scrolled by drag or swipe
 * @param classes a set of CSS class names
 * @param init an initializer extension function
 */
open class Tabbar(
    tabPosition: TabsPosition? = null,
    animation: Boolean? = null,
    swipeable: Boolean? = null,
    classes: Set<String> = setOf(),
    init: (Tabbar.() -> Unit)? = null
) : SimplePanel(classes) {

    /**
     * The tab bar position.
     */
    var tabPosition: TabsPosition? by refreshOnUpdate(tabPosition)

    /**
     *  Determines if the transitions are animated.
     */
    var animation: Boolean? by refreshOnUpdate(animation)

    /**
     * Determines if the tab bar can be scrolled by drag or swipe.
     */
    var swipeable: Boolean? by refreshOnUpdate(swipeable)

    /**
     * Distance in pixels from both edges. Swiping on these areas will prioritize parent components.
     */
    var ignoreEdgeWidth: Number? by refreshOnUpdate()

    /**
     * Whether to hide the tabs.
     */
    var hideTabs: Boolean? by refreshOnUpdate()

    /**
     * Whether the tabs show a dynamic bottom border. Only works for iOS flat design since the border is always visible in Material Design.
     */
    var tabBorder: Boolean? by refreshOnUpdate()

    /**
     * A modifier attribute to specify custom styles.
     */
    var modifier: String? by refreshOnUpdate()

    /**
     * A dynamic property returning visibility of the tab bar.
     */
    val isVisible: dynamic
        get() = getElement()?.asDynamic()?.visible

    /**
     * Swipe event listener function.
     */
    protected var onSwipeCallback: ((Number) -> Unit)? = null

    /**
     * The tab bar panel styling callback.
     */
    protected var tabbarStyleCallback: (Widget.(Int) -> Unit)? = null

    init {
        @Suppress("LeakingThis")
        init?.invoke(this)
    }

    override fun render(): VNode {
        return render("ons-tabbar", childrenVNodes())
    }

    override fun getSnAttrs(): List<StringPair> {
        val sn = super.getSnAttrs().toMutableList()
        tabPosition?.let {
            sn.add("position" to it.type)
        }
        if (animation == false) {
            sn.add("animation" to "none")
        }
        if (swipeable == true) {
            sn.add("swipeable" to "swipeable")
        }
        ignoreEdgeWidth?.let {
            sn.add("ignore-edge-width" to "${it}px")
        }
        if (hideTabs == true) {
            sn.add("hide-tabs" to "hide-tabs")
        }
        if (tabBorder == true) {
            sn.add("tab-border" to "tab-border")
        }
        modifier?.let {
            sn.add("modifier" to it)
        }
        return sn
    }

    @Suppress("UnsafeCastFromDynamic")
    override fun afterInsert(node: VNode) {
        if (onSwipeCallback != null) {
            getElement()?.asDynamic()?.onSwipe = onSwipeCallback
        }
        this.getElementJQuery()?.on("prechange") { e, _ ->
            this.dispatchEvent("onsPrechange", obj { detail = e })
            if (tabbarStyleCallback != null) {
                val widget = Widget()
                tabbarStyleCallback?.let { widget.it(e.asDynamic().detail.index) }
                val style = widget.getSnStyle().joinToString(";") { (key, value) -> "$key: $value" }
                getElementJQuery()?.find(".tabbar")?.attr("style", style)
            }
        }
        this.getElementJQuery()?.on("postchange") { e, _ ->
            this.dispatchEvent("onsPostchange", obj { detail = e })
        }
        this.getElementJQuery()?.on("reactive") { e, _ ->
            this.dispatchEvent("onsReactive", obj { detail = e })
        }
        if (tabbarStyleCallback != null) {
            val activeIndex = if (getActiveTabIndex().toInt() >= 0) {
                getActiveTabIndex().toInt()
            } else {
                val childIndex = getChildren().indexOfFirst { it is Tab && it.active == true }
                if (childIndex >= 0) {
                    childIndex
                } else {
                    0
                }
            }
            val widget = Widget()
            tabbarStyleCallback?.let { widget.it(activeIndex) }
            val style = widget.getSnStyle().joinToString(";") { (key, value) -> "$key: $value" }
            getElementJQuery()?.find(".tabbar")?.attr("style", style)
        }
    }

    override fun afterDestroy() {
        children.forEach {
            if (it is Page) remove(it)
        }
    }

    /**
     * Shows specified tab page.
     * @param index the tab index
     * @param options a parameter object
     */
    @Suppress("UnsafeCastFromDynamic")
    open fun setActiveTab(index: Int, options: dynamic = undefined): Promise<Unit>? {
        return getElement()?.asDynamic()?.setActiveTab(index, options)
    }

    /**
     * Shows or hides the tab bar.
     * @param visible whether the tab bar is visible
     */
    @Suppress("UnsafeCastFromDynamic")
    open fun setTabbarVisibility(visible: Boolean): Unit {
        return getElement()?.asDynamic()?.setTabbarVisibility(visible)
    }

    /**
     * Gets the active tab index.
     * @return active tab index
     */
    @Suppress("UnsafeCastFromDynamic")
    open fun getActiveTabIndex(): Number {
        return getElement()?.asDynamic()?.getActiveTabIndex() ?: -1
    }

    /**
     * Sets swipe event listener.
     * @param callback an event listener
     */
    open fun onSwipe(callback: (ratio: Number) -> Unit) {
        onSwipeCallback = callback
        getElement()?.asDynamic()?.onSwipe = callback
    }

    /**
     * Clears swipe event listener.
     */
    open fun onSwipeClear() {
        onSwipeCallback = null
        getElement()?.asDynamic()?.onSwipe = undefined
    }

    /**
     * Sets the tab bar panel styling callback.
     * @param callback a styling callback
     */
    open fun tabbarStyle(callback: Widget.(index: Int) -> Unit) {
        tabbarStyleCallback = callback
    }

    /**
     * Clears the tab bar panel styling callback.
     */
    open fun tabbarStyleClear() {
        tabbarStyleCallback = null
    }
}

/**
 * DSL builder extension function.
 *
 * It takes the same parameters as the constructor of the built component.
 */
fun Page.tabbar(
    tabPosition: TabsPosition? = null,
    animation: Boolean = true,
    swipeable: Boolean? = null,
    classes: Set<String>? = null,
    className: String? = null,
    init: (Tabbar.() -> Unit)? = null
): Tabbar {
    val tabbar = Tabbar(tabPosition, animation, swipeable, classes ?: className.set, init)
    this.add(tabbar)
    return tabbar
}