/*
 * Copyright 2018 Allan Wang
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.pitchedapps.frost.web

import android.content.Context
import android.webkit.JavascriptInterface
import com.pitchedapps.frost.activities.MainActivity
import com.pitchedapps.frost.activities.WebOverlayActivityBase
import com.pitchedapps.frost.contracts.MainActivityContract
import com.pitchedapps.frost.contracts.VideoViewHolder
import com.pitchedapps.frost.db.CookieEntity
import com.pitchedapps.frost.facebook.FbCookie
import com.pitchedapps.frost.utils.L
import com.pitchedapps.frost.utils.Prefs
import com.pitchedapps.frost.utils.WebContext
import com.pitchedapps.frost.utils.cookies
import com.pitchedapps.frost.utils.ctxCoroutine
import com.pitchedapps.frost.utils.isIndependent
import com.pitchedapps.frost.utils.launchImageActivity
import com.pitchedapps.frost.utils.showWebContextMenu
import com.pitchedapps.frost.views.FrostWebView
import kotlinx.coroutines.channels.SendChannel
import kotlinx.coroutines.launch
import org.koin.android.ext.android.inject
import org.koin.core.KoinComponent
import org.koin.core.inject

/**
 * Created by Allan Wang on 2017-06-01.
 */
class FrostJSI(val web: FrostWebView) {

    private val fbCookie: FbCookie get() = web.fbCookie
    private val prefs: Prefs get() = web.prefs
    private val context: Context = web.context
    private val activity: MainActivity? = context as? MainActivity
    private val header: SendChannel<String>? = activity?.headerBadgeChannel
    private val refresh: SendChannel<Boolean> = web.parent.refreshChannel
    private val cookies: List<CookieEntity> = activity?.cookies() ?: arrayListOf()

    /**
     * Attempts to load the url in an overlay
     * Returns {@code true} if successful, meaning the event is consumed,
     * or {@code false} otherwise, meaning the event should be propagated
     */
    @JavascriptInterface
    fun loadUrl(url: String?): Boolean = if (url == null) false else web.requestWebOverlay(url)

    @JavascriptInterface
    fun loadVideo(url: String?, isGif: Boolean): Boolean =
        if (url != null && prefs.enablePip) {
            web.post {
                (context as? VideoViewHolder)?.showVideo(url, isGif)
                    ?: L.e { "Could not load video; contract not implemented" }
            }
            true
        } else {
            false
        }

    @JavascriptInterface
    fun reloadBaseUrl(animate: Boolean) {
        L.d { "FrostJSI reload" }
        web.post {
            web.stopLoading()
            web.reloadBase(animate)
        }
    }

    @JavascriptInterface
    fun contextMenu(url: String?, text: String?) {
        // url will be formatted through webcontext
        web.post { context.showWebContextMenu(WebContext(url.takeIf { it.isIndependent }, text), fbCookie) }
    }

    /**
     * Get notified when a stationary long click starts or ends
     * This will be used to toggle the main activities viewpager swipe
     */
    @JavascriptInterface
    fun longClick(start: Boolean) {
        activity?.contentBinding?.viewpager?.enableSwipe = !start
        if (web.frostWebClient.urlSupportsRefresh) {
            web.parent.swipeEnabled = !start
        }
    }

    /**
     * Allow or disallow the pull down to refresh action
     */
    @JavascriptInterface
    fun disableSwipeRefresh(disable: Boolean) {
        if (!web.frostWebClient.urlSupportsRefresh) {
            return
        }
        web.parent.swipeEnabled = !disable
        if (disable) {
            // locked onto an input field; ensure content is visible
            (context as? MainActivityContract)?.collapseAppBar()
        }
    }

    @JavascriptInterface
    fun loadLogin() {
        L.d { "Sign up button found; load login" }
        context.ctxCoroutine.launch {
            fbCookie.logout(context)
        }
    }

    /**
     * Launch image overlay
     */
    @JavascriptInterface
    fun loadImage(imageUrl: String, text: String?) {
        context.launchImageActivity(imageUrl, text)
    }

    @JavascriptInterface
    fun emit(flag: Int) {
        web.post { web.frostWebClient.emit(flag) }
    }

    @JavascriptInterface
    fun isReady() {
        if (web.frostWebClient !is FrostWebViewClientMenu) {
            refresh.offer(false)
        }
    }

    @JavascriptInterface
    fun handleHtml(html: String?) {
        html ?: return
        web.post { web.frostWebClient.handleHtml(html) }
    }

    @JavascriptInterface
    fun handleHeader(html: String?) {
        html ?: return
        header?.offer(html)
    }

    @JavascriptInterface
    fun allowHorizontalScrolling(enable: Boolean) {
        activity?.contentBinding?.viewpager?.enableSwipe = enable
        (context as? WebOverlayActivityBase)?.swipeBack?.disallowIntercept = !enable
    }
}