package net.lacolaco.smileessence.activity

import android.app.ActivityManager
import android.content.Intent
import android.graphics.drawable.BitmapDrawable
import android.os.Bundle
import android.support.v4.view.ViewPager
import android.support.v7.app.AppCompatActivity
import android.support.v7.graphics.Palette
import android.text.TextUtils
import android.view.Menu
import android.view.MenuItem
import kotlinx.android.synthetic.main.activity_main.*
import net.lacolaco.smileessence.Application
import net.lacolaco.smileessence.Logger
import net.lacolaco.smileessence.R
import net.lacolaco.smileessence.World
import net.lacolaco.smileessence.data.PageInfo
import net.lacolaco.smileessence.entity.Tweet
import net.lacolaco.smileessence.entity.User
import net.lacolaco.smileessence.twitter.TwitterTaskException
import net.lacolaco.smileessence.twitter.getTweetAsync
import net.lacolaco.smileessence.twitter.getUserAsync
import net.lacolaco.smileessence.util.bg
import net.lacolaco.smileessence.util.getMainActivityOrCancel
import net.lacolaco.smileessence.util.launchUi
import net.lacolaco.smileessence.view.DialogHelper
import net.lacolaco.smileessence.view.MainFragmentPagerAdapter
import net.lacolaco.smileessence.view.confirm
import net.lacolaco.smileessence.view.dialog.AppInfoDialogFragment
import net.lacolaco.smileessence.view.dialog.StatusDetailDialogFragment
import net.lacolaco.smileessence.view.dialog.UserDetailDialogFragment
import net.lacolaco.smileessence.view.page.ComposePageFragment
import java.util.regex.Pattern

class MainActivity : AppCompatActivity() {
    val world by lazy {
        val uri = intent.data ?: throw IllegalStateException("[BUG] data not set")
        val userIdValue = uri.getQueryParameter("user_id") ?: throw IllegalStateException("[BUG] user_id not set")
        World[userIdValue.toLong()]
    }
    private lateinit var pagerAdapter: MainFragmentPagerAdapter

    fun openHomePage() {
        view_pager.setCurrentItem(world.pages.indexOfFirst { it is PageInfo.TweetsPageInfo }, true)
    }

    private fun setSelectedPageIndex(position: Int, smooth: Boolean = true) {
        view_pager.setCurrentItem(position, smooth)
    }

    fun openPostPageAndReplyTo(tweet: Tweet, prefix: String) {
        val postPagePosition = world.pages.indexOfFirst { it is PageInfo.ComposePageInfo }
        assert(postPagePosition != -1)
        (pagerAdapter.getPageFragmentAt(postPagePosition) as ComposePageFragment).setInReplyTo(tweet, prefix)
        setSelectedPageIndex(postPagePosition, true)
    }

    fun openPostPageAndReplyTo(user: User) {
        val postPagePosition = world.pages.indexOfFirst { it is PageInfo.ComposePageInfo }
        assert(postPagePosition != -1)
        (pagerAdapter.getPageFragmentAt(postPagePosition) as ComposePageFragment).setInReplyTo(user)
        setSelectedPageIndex(postPagePosition, true)
    }

    fun openPostPageAndAppendText(text: String) {
        val postPagePosition = world.pages.indexOfFirst { it is PageInfo.ComposePageInfo }
        assert(postPagePosition != -1)
        (pagerAdapter.getPageFragmentAt(postPagePosition) as ComposePageFragment).appendText(text)
        setSelectedPageIndex(postPagePosition, true)
    }

    private fun setTitle() {
        val label = getString(R.string.app_name) + " - @" + world.user.screenName
        if (android.os.Build.VERSION.SDK_INT >= 21) {
            setTaskDescription(ActivityManager.TaskDescription(label, null, world.themeColor))
            window.statusBarColor = world.themeColor
            toolbar.setBackgroundColor(world.themeColor)
        }

        launchUi {
            val bitmap = world.getProfileImageBitmap((32 * resources.displayMetrics.density).toInt())
            val palette = bg { Palette.from(bitmap).generate() }.await()
            if (isDestroyed)
                return@launchUi

            toolbar.navigationIcon = BitmapDrawable(resources, bitmap)

            val swatch = if (world.useDarkTheme)
                palette.darkVibrantSwatch ?: palette.darkMutedSwatch ?: palette.dominantSwatch
            else
                palette.vibrantSwatch ?: palette.mutedSwatch ?: palette.dominantSwatch
            if (swatch == null) {
                Logger.info("Unable to get a theme color of @${world.user.screenName}")
            } else {
                world.themeColor = swatch.rgb
                toolbar.setBackgroundColor(world.themeColor)
                if (android.os.Build.VERSION.SDK_INT >= 21) {
                    setTaskDescription(ActivityManager.TaskDescription(label, bitmap, world.themeColor))
                    window.statusBarColor = world.themeColor
                }
            }
        }
    }

    private fun processIntent(intent: Intent) {
        val uri = intent.data
        if (uri != null) {
            if (uri.host == "twitter.com") {
                // /share and /intent/tweet: don't accept status parameter
                val postMatcher = TWITTER_POST_PATTERN.matcher(uri.path)
                if (postMatcher.find()) {
                    var text = uri.getQueryParameter("text") ?: ""
                    val url = uri.getQueryParameter("url")
                    if (!TextUtils.isEmpty(url))
                        text += " " + url
                    val hashtags = uri.getQueryParameter("hashtags")
                    if (!TextUtils.isEmpty(hashtags))
                        text += " " + hashtags.trim { it <= ' ' }.replace(",".toRegex(), " #")
                    val via = uri.getQueryParameter("via")
                    if (!TextUtils.isEmpty(via))
                        text += " via @" + via
                    val postPagePosition = world.pages.indexOfFirst { it is PageInfo.ComposePageInfo }
                    assert(postPagePosition != -1)
                    (pagerAdapter.getPageFragmentAt(postPagePosition) as ComposePageFragment).setText(text)
                    setSelectedPageIndex(postPagePosition, true)
                    return
                }
                val statusMatcher = TWITTER_STATUS_PATTERN.matcher(uri.path)
                if (statusMatcher.find()) {
                    return launchUi {
                        try {
                            val tweet = world.getTweetAsync(statusMatcher.group(1).toLong()).await()
                            DialogHelper.showDialog(world.getMainActivityOrCancel(), StatusDetailDialogFragment.newInstance(tweet))
                        } catch (e: TwitterTaskException) {
                            world.notifyError(R.string.error_intent_status_cannot_load)
                        }
                    }
                }
                val userMatcher = TWITTER_USER_PATTERN.matcher(uri.path)
                if (userMatcher.find()) {
                    return launchUi {
                        try {
                            val user = world.getUserAsync(userMatcher.group(1)).await()
                            DialogHelper.showDialog(world.getMainActivityOrCancel(), UserDetailDialogFragment.newInstance(user))
                        } catch (e: TwitterTaskException) {
                            world.notifyError(R.string.notice_error_show_user)
                        }
                    }
                }
            }
        } else when (intent.action) {
            Intent.ACTION_SEND -> {
                val type = intent.type
                if (type == "text/plain") {
                    val extra = intent.extras
                    if (extra != null) {
                        var text = extra.getCharSequence(Intent.EXTRA_TEXT).toString()
                        if (!TextUtils.isEmpty(extra.getCharSequence(Intent.EXTRA_SUBJECT))) {
                            text = extra.getCharSequence(Intent.EXTRA_SUBJECT).toString() + " " + text
                        }
                        val postPagePosition = world.pages.indexOfFirst { it is PageInfo.ComposePageInfo }
                        assert(postPagePosition != -1)
                        (pagerAdapter.getPageFragmentAt(postPagePosition) as ComposePageFragment).setText(text)
                        setSelectedPageIndex(postPagePosition, true)
                        return
                    }
                } else if (type != null && type.startsWith("image/")) {
                    val postPagePosition = world.pages.indexOfFirst { it is PageInfo.ComposePageInfo }
                    assert(postPagePosition != -1)
                    (pagerAdapter.getPageFragmentAt(postPagePosition) as ComposePageFragment)
                            .setMediaFile(intent.getParcelableExtra(Intent.EXTRA_STREAM))
                }
            }
        }
    }

    override fun onBackPressed() {
        val homeIndex = world.pages.indexOfFirst { it is PageInfo.TweetsPageInfo }
        if (view_pager.currentItem != homeIndex)
            view_pager.setCurrentItem(homeIndex, true)
        else
            confirm(R.string.dialog_confirm_exit) { finish() }
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        when (requestCode) {
            REQUEST_CODE_MANAGE_PAGES -> {
                if (resultCode == RESULT_OK) {
                    Application.toast("Restarting activity...")
                    recreate()
                }
            }
            else -> super.onActivityResult(requestCode, resultCode, data)
        }
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        Logger.debug("onCreate")
        super.onCreate(savedInstanceState)

        world.setMainActivity(this)

        setTheme(if (world.useDarkTheme) R.style.AppTheme_Dark else R.style.AppTheme_Light)
        setContentView(R.layout.activity_main)
        setSupportActionBar(toolbar)

        pagerAdapter = MainFragmentPagerAdapter(world, view_pager, fragmentManager)
        view_pager.offscreenPageLimit = pagerAdapter.count
        view_pager.adapter = pagerAdapter
        view_pager.setCurrentItem(world.pages.indexOfFirst { it is PageInfo.TweetsPageInfo }, false)
        view_pager.addOnPageChangeListener(object : ViewPager.OnPageChangeListener {
            override fun onPageScrollStateChanged(state: Int) {}

            override fun onPageScrolled(position: Int, positionOffset: Float, positionOffsetPixels: Int) {}

            override fun onPageSelected(position: Int) {
                Logger.verbose("Page #$position selected (${world.pages[position].name})")
                title = "${world.user.screenName} / ${world.pages[position].name}"
            }
        })

        // Set application title
        setTitle()

        // Fetch necessary data & start streaming API if needed
        world.setup()
    }

    override fun onCreateOptionsMenu(menu: Menu): Boolean {
        menuInflater.inflate(R.menu.main, menu)
        return true
    }

    override fun onOptionsItemSelected(item: MenuItem): Boolean {
        when (item.itemId) {
            android.R.id.home -> {
                val intent = Intent(this, ManageProfilesActivity::class.java)
                intent.putExtra(ManageProfilesActivity.INTENT_KEY_NOINIT, true)
                startActivity(intent)
            }
            R.id.actionbar_manage_pages -> {
                val intent = Intent(this, ManagePagesActivity::class.java)
                intent.putExtra(ManagePagesActivity.INTENT_KEY_WORLD_ID, world.id)
                startActivityForResult(intent, REQUEST_CODE_MANAGE_PAGES)
            }
            R.id.open_version_dialog -> DialogHelper.showDialog(this, AppInfoDialogFragment.newInstance())
            else -> return super.onOptionsItemSelected(item)
        }
        return true
    }

    override fun onPause() {
        Logger.debug("onPause")
        super.onPause()
        world.setMainActivityActive(false)
        world.checkpoint()
    }

    override fun onResume() {
        Logger.debug("onResume")
        super.onResume()
        Application.currentWorld = world
        world.setMainActivityActive(true)

        // With the current releases (~ 7) of Android, onNewIntent() doesn't seem to be called
        // properly when resuming an already running Activity that has configured as
        // documentLaunchMode=intoExisting. So, as a workaround, store the actual Intent in
        // the World associated and check it in onResume() for now. See also
        // ManageProfilesActivity::goToWorld().
        val intent = world.mainActivityIntent
        if (intent != null) {
            world.mainActivityIntent = null
            processIntent(intent)
        }
    }

    companion object {
        private val REQUEST_CODE_MANAGE_PAGES = 12
        private val TWITTER_POST_PATTERN = Pattern.compile("\\A/(intent/tweet|share)\\z")
        private val TWITTER_STATUS_PATTERN = Pattern.compile("\\A(?:/#!)?/(?:\\w{1,15})/status(?:es)?/(\\d+)\\z")
        private val TWITTER_USER_PATTERN = Pattern.compile("\\A(?:/#!)?/(\\w{1,15})/?\\z")
    }
}