/* Copyright 2018 Conny Duck
 *
 * This file is a part of Tusky.
 *
 * 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.
 *
 * Tusky 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 Tusky; if not,
 * see <http://www.gnu.org/licenses>. */

package com.keylesspalace.tusky

import android.animation.ArgbEvaluator
import android.arch.lifecycle.Observer
import android.arch.lifecycle.ViewModelProviders
import android.content.Context
import android.content.Intent
import android.graphics.Color
import android.graphics.PorterDuff
import android.os.Bundle
import android.preference.PreferenceManager
import android.support.annotation.AttrRes
import android.support.annotation.ColorInt
import android.support.annotation.Px
import android.support.design.widget.*
import android.support.text.emoji.EmojiCompat
import android.support.v4.app.ActivityOptionsCompat
import android.support.v4.app.Fragment
import android.support.v4.content.ContextCompat
import android.support.v4.view.ViewCompat
import android.support.v4.widget.TextViewCompat
import android.support.v7.app.AlertDialog
import android.support.v7.widget.LinearLayoutManager
import android.view.Menu
import android.view.MenuItem
import android.view.View
import android.view.ViewGroup
import com.keylesspalace.tusky.adapter.AccountFieldAdapter
import com.keylesspalace.tusky.di.ViewModelFactory
import com.keylesspalace.tusky.entity.Account
import com.keylesspalace.tusky.entity.Relationship
import com.keylesspalace.tusky.interfaces.ActionButtonActivity
import com.keylesspalace.tusky.interfaces.LinkListener
import com.keylesspalace.tusky.pager.AccountPagerAdapter
import com.keylesspalace.tusky.util.*
import com.keylesspalace.tusky.viewmodel.AccountViewModel
import com.squareup.picasso.Picasso
import dagger.android.AndroidInjector
import dagger.android.DispatchingAndroidInjector
import dagger.android.support.HasSupportFragmentInjector
import kotlinx.android.synthetic.main.activity_account.*
import kotlinx.android.synthetic.main.view_account_moved.*
import java.text.NumberFormat
import javax.inject.Inject

class AccountActivity : BottomSheetActivity(), ActionButtonActivity, HasSupportFragmentInjector, LinkListener {

    @Inject
    lateinit var dispatchingAndroidInjector: DispatchingAndroidInjector<Fragment>
    @Inject
    lateinit var viewModelFactory: ViewModelFactory

    private lateinit var viewModel: AccountViewModel

    private val accountFieldAdapter = AccountFieldAdapter(this)

    private lateinit var accountId: String
    private var followState: FollowState = FollowState.NOT_FOLLOWING
    private var blocking: Boolean = false
    private var muting: Boolean = false
    private var showingReblogs: Boolean = false
    private var isSelf: Boolean = false
    private var loadedAccount: Account? = null

    // fields for scroll animation
    private var hideFab: Boolean = false
    private var oldOffset: Int = 0
    @ColorInt
    private var toolbarColor: Int = 0
    @ColorInt
    private var backgroundColor: Int = 0
    @ColorInt
    private var statusBarColorTransparent: Int = 0
    @ColorInt
    private var statusBarColorOpaque: Int = 0
    @ColorInt
    private var textColorPrimary: Int = 0
    @ColorInt
    private var textColorSecondary: Int = 0
    @Px
    private var avatarSize: Float = 0f
    @Px
    private var titleVisibleHeight: Int = 0

    private enum class FollowState {
        NOT_FOLLOWING,
        FOLLOWING,
        REQUESTED
    }

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

        viewModel = ViewModelProviders.of(this, viewModelFactory)[AccountViewModel::class.java]

        viewModel.accountData.observe(this, Observer<Resource<Account>> {
            when (it) {
                is Success -> onAccountChanged(it.data)
                is Error -> {
                    Snackbar.make(accountCoordinatorLayout, R.string.error_generic, Snackbar.LENGTH_LONG)
                            .setAction(R.string.action_retry) { reload() }
                            .show()
                }
            }
        })
        viewModel.relationshipData.observe(this, Observer<Resource<Relationship>> {
            val relation = it?.data
            if (relation != null) {
                onRelationshipChanged(relation)
            }

            if (it is Error) {
                Snackbar.make(accountCoordinatorLayout, R.string.error_generic, Snackbar.LENGTH_LONG)
                        .setAction(R.string.action_retry) { reload() }
                        .show()
            }

        })

        val decorView = window.decorView
        decorView.systemUiVisibility = decorView.systemUiVisibility or View.SYSTEM_UI_FLAG_LAYOUT_STABLE or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
        window.statusBarColor = Color.TRANSPARENT

        setContentView(R.layout.activity_account)

        val intent = intent
        accountId = intent.getStringExtra(KEY_ACCOUNT_ID)

        // set toolbar top margin according to system window insets
        ViewCompat.setOnApplyWindowInsetsListener(accountCoordinatorLayout) { _, insets ->
            val top = insets.systemWindowInsetTop

            val toolbarParams = accountToolbar.layoutParams as CollapsingToolbarLayout.LayoutParams
            toolbarParams.topMargin = top

            insets.consumeSystemWindowInsets()
        }

        // Setup the toolbar.
        setSupportActionBar(accountToolbar)
        supportActionBar?.title = null
        supportActionBar?.setDisplayHomeAsUpEnabled(true)
        supportActionBar?.setDisplayShowHomeEnabled(true)

        hideFab = PreferenceManager.getDefaultSharedPreferences(this).getBoolean("fabHide", false)

        toolbarColor = ThemeUtils.getColor(this, R.attr.toolbar_background_color)
        backgroundColor = ThemeUtils.getColor(this, android.R.attr.colorBackground)
        statusBarColorTransparent = ContextCompat.getColor(this, R.color.header_background_filter)
        statusBarColorOpaque = ThemeUtils.getColor(this, R.attr.colorPrimaryDark)
        textColorPrimary = ThemeUtils.getColor(this, android.R.attr.textColorPrimary)
        textColorSecondary = ThemeUtils.getColor(this, android.R.attr.textColorSecondary)
        avatarSize = resources.getDimensionPixelSize(R.dimen.account_activity_avatar_size).toFloat()
        titleVisibleHeight = resources.getDimensionPixelSize(R.dimen.account_activity_scroll_title_visible_height)

        ThemeUtils.setDrawableTint(this, accountToolbar.navigationIcon, R.attr.account_toolbar_icon_tint_uncollapsed)
        ThemeUtils.setDrawableTint(this, accountToolbar.overflowIcon, R.attr.account_toolbar_icon_tint_uncollapsed)

        // Add a listener to change the toolbar icon color when it enters/exits its collapsed state.
        accountAppBarLayout.addOnOffsetChangedListener(object : AppBarLayout.OnOffsetChangedListener {
            @AttrRes var priorAttribute = R.attr.account_toolbar_icon_tint_uncollapsed

            override fun onOffsetChanged(appBarLayout: AppBarLayout, verticalOffset: Int) {

                @AttrRes val attribute = if (titleVisibleHeight + verticalOffset < 0) {
                    accountToolbar.setTitleTextColor(textColorPrimary)
                    accountToolbar.setSubtitleTextColor(textColorSecondary)

                    R.attr.account_toolbar_icon_tint_collapsed
                } else {
                    accountToolbar.setTitleTextColor(Color.TRANSPARENT)
                    accountToolbar.setSubtitleTextColor(Color.TRANSPARENT)

                    R.attr.account_toolbar_icon_tint_uncollapsed
                }
                if (attribute != priorAttribute) {
                    priorAttribute = attribute
                    val context = accountToolbar.context
                    ThemeUtils.setDrawableTint(context, accountToolbar.navigationIcon, attribute)
                    ThemeUtils.setDrawableTint(context, accountToolbar.overflowIcon, attribute)
                }

                if (hideFab && !isSelf && !blocking) {
                    if (verticalOffset > oldOffset) {
                        accountFloatingActionButton.show()
                    }
                    if (verticalOffset < oldOffset) {
                        accountFloatingActionButton.hide()
                    }
                }
                oldOffset = verticalOffset

                val scaledAvatarSize = (avatarSize + verticalOffset) / avatarSize

                accountAvatarImageView.scaleX = scaledAvatarSize
                accountAvatarImageView.scaleY = scaledAvatarSize

                accountAvatarImageView.visible(scaledAvatarSize > 0)

                var transparencyPercent = Math.abs(verticalOffset) / titleVisibleHeight.toFloat()
                if (transparencyPercent > 1) transparencyPercent = 1f

                window.statusBarColor = argbEvaluator.evaluate(transparencyPercent, statusBarColorTransparent, statusBarColorOpaque) as Int

                val evaluatedToolbarColor = argbEvaluator.evaluate(transparencyPercent, Color.TRANSPARENT, toolbarColor) as Int
                val evaluatedTabBarColor = argbEvaluator.evaluate(transparencyPercent, backgroundColor, toolbarColor) as Int
                accountToolbar.setBackgroundColor(evaluatedToolbarColor)
                accountHeaderInfoContainer.setBackgroundColor(evaluatedTabBarColor)
                accountTabLayout.setBackgroundColor(evaluatedTabBarColor)
            }
        })

        // Initialise the default UI states.
        accountFloatingActionButton.hide()
        accountFollowButton.hide()
        accountFollowsYouTextView.hide()

        // Obtain information to fill out the profile.
        viewModel.obtainAccount(accountId)

        val activeAccount = accountManager.activeAccount

        if (accountId == activeAccount?.accountId) {
            isSelf = true
            updateButtons()
        } else {
            isSelf = false
            viewModel.obtainRelationship(accountId)
        }

        // setup the RecyclerView for the account fields
        accountFieldList.isNestedScrollingEnabled = false
        accountFieldList.layoutManager = LinearLayoutManager(this)
        accountFieldList.adapter = accountFieldAdapter

        // Setup the tabs and timeline pager.
        val adapter = AccountPagerAdapter(supportFragmentManager, accountId)
        val pageTitles = arrayOf(getString(R.string.title_statuses), getString(R.string.title_statuses_with_replies), getString(R.string.title_media))
        adapter.setPageTitles(pageTitles)
        accountFragmentViewPager.pageMargin = resources.getDimensionPixelSize(R.dimen.tab_page_margin)
        val pageMarginDrawable = ThemeUtils.getDrawable(this, R.attr.tab_page_margin_drawable,
                R.drawable.tab_page_margin_dark)
        accountFragmentViewPager.setPageMarginDrawable(pageMarginDrawable)
        accountFragmentViewPager.adapter = adapter
        accountFragmentViewPager.offscreenPageLimit = 2
        accountTabLayout.setupWithViewPager(accountFragmentViewPager)

        val accountListClickListener = { v: View ->
            val type = when (v.id) {
                R.id.accountFollowers-> AccountListActivity.Type.FOLLOWERS
                R.id.accountFollowing -> AccountListActivity.Type.FOLLOWING
                else -> throw AssertionError()
            }
            val accountListIntent = AccountListActivity.newIntent(this, type, accountId)
            startActivityWithSlideInAnimation(accountListIntent)
        }
        accountFollowers.setOnClickListener(accountListClickListener)
        accountFollowing.setOnClickListener(accountListClickListener)

        accountStatuses.setOnClickListener {
            // Make nice ripple effect on tab
            accountTabLayout.getTabAt(0)!!.select()
            val poorTabView = (accountTabLayout.getChildAt(0) as ViewGroup).getChildAt(0)
            poorTabView.isPressed = true
            accountTabLayout.postDelayed({ poorTabView.isPressed = false }, 300)
        }
    }

    private fun onAccountChanged(account: Account?) {
        if (account != null) {
            loadedAccount = account
            val usernameFormatted = getString(R.string.status_username_format, account.username)
            accountUsernameTextView.text = usernameFormatted
            accountDisplayNameTextView.text = CustomEmojiHelper.emojifyString(account.name, account.emojis, accountDisplayNameTextView)
            if (supportActionBar != null) {
                try {
                    supportActionBar?.title = EmojiCompat.get().process(account.name)
                } catch (e: IllegalStateException) {
                    supportActionBar?.title = account.name
                }

                val subtitle = String.format(getString(R.string.status_username_format),
                        account.username)
                supportActionBar?.subtitle = subtitle
            }
            val emojifiedNote = CustomEmojiHelper.emojifyText(account.note, account.emojis, accountNoteTextView)
            LinkHelper.setClickableText(accountNoteTextView, emojifiedNote, null, this)

            accountLockedImageView.visible(account.locked)
            accountBadgeTextView.visible(account.bot)

            Picasso.with(this)
                    .load(account.avatar)
                    .placeholder(R.drawable.avatar_default)
                    .into(accountAvatarImageView)
            Picasso.with(this)
                    .load(account.header)
                    .fit() // prevents crash with large header images
                    .centerCrop()
                    .into(accountHeaderImageView)

            accountAvatarImageView.setOnClickListener { avatarView ->
                val intent = ViewMediaActivity.newAvatarIntent(avatarView.context, account.avatar)

                ViewCompat.setTransitionName(avatarView, account.avatar)
                val options = ActivityOptionsCompat.makeSceneTransitionAnimation(this, avatarView, account.avatar)

                startActivity(intent, options.toBundle())
            }

            accountFieldAdapter.fields = account.fields ?: emptyList()
            accountFieldAdapter.emojis = account.emojis ?: emptyList()
            accountFieldAdapter.notifyDataSetChanged()

            if (account.moved != null) {
                val movedAccount = account.moved

                accountMovedView.show()

                // necessary because accountMovedView is now replaced in layout hierachy
                findViewById<View>(R.id.accountMovedView).setOnClickListener {
                    onViewAccount(movedAccount.id)
                }

                accountMovedDisplayName.text = movedAccount.name
                accountMovedUsername.text = getString(R.string.status_username_format, movedAccount.username)

                Picasso.with(this)
                        .load(movedAccount.avatar)
                        .placeholder(R.drawable.avatar_default)
                        .into(accountMovedAvatar)

                accountMovedText.text = getString(R.string.account_moved_description, movedAccount.displayName)

                // this is necessary because API 19 can't handle vector compound drawables
                val movedIcon = ContextCompat.getDrawable(this, R.drawable.ic_briefcase)?.mutate()
                val textColor = ThemeUtils.getColor(this, android.R.attr.textColorTertiary)
                movedIcon?.setColorFilter(textColor, PorterDuff.Mode.SRC_IN)

                TextViewCompat.setCompoundDrawablesRelativeWithIntrinsicBounds(accountMovedText, movedIcon, null, null, null)

                accountFollowers.hide()
                accountFollowing.hide()
                accountStatuses.hide()
                accountTabLayout.hide()
                accountFragmentViewPager.hide()
            }

            if (account.isRemote()) {
                accountRemoveView.show()
                accountRemoveView.setOnClickListener {
                    LinkHelper.openLink(account.url, this)
                }
            }

            val numberFormat = NumberFormat.getNumberInstance()
            accountFollowersTextView.text = numberFormat.format(account.followersCount)
            accountFollowingTextView.text = numberFormat.format(account.followingCount)
            accountStatusesTextView.text = numberFormat.format(account.statusesCount)

            accountFloatingActionButton.setOnClickListener { mention() }

            accountFollowButton.setOnClickListener {
                if (isSelf) {
                    val intent = Intent(this@AccountActivity, EditProfileActivity::class.java)
                    startActivity(intent)
                    return@setOnClickListener
                }
                when (followState) {
                    AccountActivity.FollowState.NOT_FOLLOWING -> {
                        viewModel.changeFollowState(accountId)
                    }
                    AccountActivity.FollowState.REQUESTED -> {
                        showFollowRequestPendingDialog()
                    }
                    AccountActivity.FollowState.FOLLOWING -> {
                        showUnfollowWarningDialog()
                    }
                }
                updateFollowButton()
            }
        }
    }

    override fun onSaveInstanceState(outState: Bundle) {
        outState.putString(KEY_ACCOUNT_ID, accountId)
        super.onSaveInstanceState(outState)
    }

    private fun onRelationshipChanged(relation: Relationship) {
        followState = when {
            relation.following -> FollowState.FOLLOWING
            relation.requested -> FollowState.REQUESTED
            else -> FollowState.NOT_FOLLOWING
        }
        blocking = relation.blocking
        muting = relation.muting
        showingReblogs = relation.showingReblogs

        accountFollowsYouTextView.visible(relation.followedBy)

        updateButtons()
    }

    private fun reload() {
        viewModel.obtainAccount(accountId, true)
        viewModel.obtainRelationship(accountId)
    }

    private fun updateFollowButton() {
        if(isSelf) {
            accountFollowButton.setText(R.string.action_edit_own_profile)
            return
        }
        when (followState) {
            AccountActivity.FollowState.NOT_FOLLOWING -> {
                accountFollowButton.setText(R.string.action_follow)
            }
            AccountActivity.FollowState.REQUESTED -> {
                accountFollowButton.setText(R.string.state_follow_requested)
            }
            AccountActivity.FollowState.FOLLOWING -> {
                accountFollowButton.setText(R.string.action_unfollow)
            }
        }
    }

    private fun updateButtons() {
        invalidateOptionsMenu()

        if (!blocking && loadedAccount?.moved == null) {

            accountFollowButton.show()
            updateFollowButton()

            if(isSelf) {
                accountFloatingActionButton.hide()
            } else {
                accountFloatingActionButton.show()
            }

        } else {
            accountFloatingActionButton.hide()
            accountFollowButton.hide()
        }
    }

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

    override fun onPrepareOptionsMenu(menu: Menu): Boolean {
        if (!isSelf) {
            val follow = menu.findItem(R.id.action_follow)
            follow.title = if (followState == FollowState.NOT_FOLLOWING) {
                getString(R.string.action_follow)
            } else {
                getString(R.string.action_unfollow)
            }

            follow.isVisible = followState != FollowState.REQUESTED

            val block = menu.findItem(R.id.action_block)
            block.title = if (blocking) {
                getString(R.string.action_unblock)
            } else {
                getString(R.string.action_block)
            }

            val mute = menu.findItem(R.id.action_mute)
            mute.title = if (muting) {
                getString(R.string.action_unmute)
            } else {
                getString(R.string.action_mute)
            }

            if (followState == FollowState.FOLLOWING) {
                val showReblogs = menu.findItem(R.id.action_show_reblogs)
                showReblogs.title = if (showingReblogs) {
                    getString(R.string.action_hide_reblogs)
                } else {
                    getString(R.string.action_show_reblogs)
                }

            } else {
                menu.removeItem(R.id.action_show_reblogs)
            }

        } else {
            // It shouldn't be possible to block or follow yourself.
            menu.removeItem(R.id.action_follow)
            menu.removeItem(R.id.action_block)
            menu.removeItem(R.id.action_mute)
            menu.removeItem(R.id.action_show_reblogs)
        }
        return super.onPrepareOptionsMenu(menu)
    }

    private fun showFollowRequestPendingDialog() {
        AlertDialog.Builder(this)
                .setMessage(R.string.dialog_message_cancel_follow_request)
                .setPositiveButton(android.R.string.ok) { _, _ -> viewModel.changeFollowState(accountId) }
                .setNegativeButton(android.R.string.cancel, null)
                .show()
    }

    private fun showUnfollowWarningDialog() {
        AlertDialog.Builder(this)
                .setMessage(R.string.dialog_unfollow_warning)
                .setPositiveButton(android.R.string.ok) { _, _ -> viewModel.changeFollowState(accountId) }
                .setNegativeButton(android.R.string.cancel, null)
                .show()
    }

    private fun mention() {
        loadedAccount?.let {
            val intent = ComposeActivity.IntentBuilder()
                    .mentionedUsernames(setOf(it.username))
                    .build(this)
            startActivity(intent)
        }
    }

    override fun onViewTag(tag: String) {
        val intent = Intent(this, ViewTagActivity::class.java)
        intent.putExtra("hashtag", tag)
        startActivityWithSlideInAnimation(intent)
    }

    override fun onViewAccount(id: String) {
        val intent = Intent(this, AccountActivity::class.java)
        intent.putExtra("id", id)
        startActivityWithSlideInAnimation(intent)
    }

    override fun onViewUrl(url: String) {
        viewUrl(url)
    }

    override fun onOptionsItemSelected(item: MenuItem): Boolean {
        when (item.itemId) {
            android.R.id.home -> {
                onBackPressed()
                return true
            }
            R.id.action_mention -> {
                mention()
                return true
            }
            R.id.action_open_in_web -> {
                // If the account isn't loaded yet, eat the input.
                if (loadedAccount != null) {
                    LinkHelper.openLink(loadedAccount?.url, this)
                }
                return true
            }
            R.id.action_follow -> {
                viewModel.changeFollowState(accountId)
                return true
            }
            R.id.action_block -> {
                viewModel.changeBlockState(accountId)
                return true
            }
            R.id.action_mute -> {
                viewModel.changeMuteState(accountId)
                return true
            }

            R.id.action_show_reblogs -> {
                viewModel.changeShowReblogsState(accountId)
                return true
            }
        }
        return super.onOptionsItemSelected(item)
    }

    override fun getActionButton(): FloatingActionButton? {
        return if (!isSelf && !blocking) {
            accountFloatingActionButton
        } else null
    }

    override fun supportFragmentInjector(): AndroidInjector<Fragment> {
        return dispatchingAndroidInjector
    }

    companion object {

        private const val KEY_ACCOUNT_ID = "id"
        private val argbEvaluator = ArgbEvaluator()

        @JvmStatic
        fun getIntent(context: Context, accountId: String): Intent {
            val intent = Intent(context, AccountActivity::class.java)
            intent.putExtra(KEY_ACCOUNT_ID, accountId)
            return intent
        }
    }

}