package io.xdrm.lebonprix

import android.content.Intent
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.os.Handler
import android.text.Editable
import android.text.TextWatcher
import android.util.Log
import android.view.KeyEvent
import android.view.WindowManager
import android.widget.Toast
import io.xdrm.lebonprix.anim.HomeFilterAnimation
import io.xdrm.lebonprix.anim.UnderlineAnimation
import io.xdrm.lebonprix.api.CategoryFetcher
import io.xdrm.lebonprix.api.PricesFetcher
import io.xdrm.lebonprix.model.Category
import io.xdrm.lebonprix.model.CategoryItem
import io.xdrm.lebonprix.model.CategoryItemStore
import io.xdrm.todoleast.adapter.CategoryAdapter
import kotlinx.android.synthetic.main.activity_home.*
import kotlinx.coroutines.*
import okhttp3.OkHttpClient
import org.json.JSONArray



class HomeActivity : AppCompatActivity() {

    companion object {
        val SEARCH_KEY_TIMEOUT: Long = 500
    }

    private val categoryStore = CategoryItemStore
    private val categoryAdapter = CategoryAdapter(CategoryItemStore.data)

    private lateinit var underline_animator: UnderlineAnimation
    private lateinit var load_animator: HomeFilterAnimation

    private var last_search_time: Long = 0
    private var last_search: String = ""
    private var httpJob: Job? = null

    private val httpClient = OkHttpClient()
    private var ended = false
    private var loader: Job? = null

    private lateinit var apiCategories: CategoryFetcher
    private lateinit var apiPrices: PricesFetcher

    override fun onResume() {
        super.onResume()
        runOnUiThread {  load_animator.stage(HomeFilterAnimation.CLEAR_ALL).during(0).start() }
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        window.setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.activity_home)

        // manage underline animation
        underline_animator = UnderlineAnimation(search_underline)
        load_animator = HomeFilterAnimation(applicationContext, filter)
        apiCategories = CategoryFetcher(this, search_underline, underline_animator, httpClient)
        apiPrices = PricesFetcher(this, httpClient)

        // listen for focus changes
        search.setOnFocusChangeListener{v, focus ->
            if( focus ) underline_animator.animate(0F, 1F).during(30).start()
            else        underline_animator.animate(1F, 0F).during(30).start()
        }

        // listen for clicks
        search.setOnClickListener {
            underline_animator.animate(0F, 1F).during(30).start()
        }

        category_grid.adapter = categoryAdapter

        // launch category fetch
        search.addTextChangedListener(object : TextWatcher{
            override fun afterTextChanged(s: Editable?) {}
            override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {}

            override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
                categoryCoordinator(search.text.toString().trim())

                // manage when key is pressed before the SEARCH_KEY_TIMEOUT is reached, so ignored
                Handler().postDelayed({
                    categoryCoordinator(search.text.toString().trim())
                }, HomeActivity.SEARCH_KEY_TIMEOUT)
            }
        })


        // launch search
        search.setOnKeyListener { v, keyCode, event ->
            if( event.action != KeyEvent.ACTION_DOWN || keyCode != KeyEvent.KEYCODE_ENTER )
                return@setOnKeyListener false

            launch_search()
            return@setOnKeyListener true
        }
        search_button.setOnClickListener { launch_search() }

        updateCategories(JSONArray("[]"))

    }

    private fun categoryCoordinator(keywords: String){
        val now = System.currentTimeMillis()
        if( last_search_time > 0 && now-last_search_time < HomeActivity.SEARCH_KEY_TIMEOUT )
            return

        if( keywords == last_search )
            return

        last_search_time = now
        last_search = keywords

        if( httpJob != null && httpJob!!.isActive ) {
            httpJob!!.cancel()
            underline_animator.animateContinue(1F).during(0).start()
        }

        httpJob = GlobalScope.launch {
            updateCategories( apiCategories.fetch(last_search) )
        }
    }

    private fun launch_search(){
        val selectedCategories = getCategories()

        // (1) Loader
        if( loader != null && loader!!.isActive )
            loader!!.cancel()

        loader = GlobalScope.launch(Dispatchers.Main) {
            // launch animation
            load_animator.stage(HomeFilterAnimation.STAGE_CLEAN).during(300).start()
            delay(300)
            load_animator.stage(HomeFilterAnimation.STAGE_CENTER).during(300).start()
            delay(300)
            while(true){
                load_animator.stage(HomeFilterAnimation.STAGE_LOAD).during(5000).start()
                delay(5000)
            }
        }

        if( httpJob != null && httpJob!!.isActive )
            httpJob!!.cancel()

        httpJob = GlobalScope.launch {

            // exec request
            val prices = apiPrices.fetch(search.text.toString(), selectedCategories.toTypedArray())
            loader?.cancel()

            // stop all if no result
            if( prices.isNullOrEmpty() ) {
                runOnUiThread {
                    load_animator.stage(HomeFilterAnimation.CLEAR_ALL).during(0).start()
                }
                return@launch
            }

            // transition
            runOnUiThread {
                load_animator.stage(HomeFilterAnimation.STAGE_END).during(500).start()
            }
            delay(500)

            val int = Intent(this@HomeActivity, ResultActivity::class.java)
            int.putExtra("prices", prices)
            startActivity(int)
            overridePendingTransition(0, 0)
        }
    }

    private fun updateCategories(categories: JSONArray){
        // 1. Update categories
        categoryStore.data.clear()
        categoryStore.data.add(CategoryItem(Category.ALL, false, 1F)) // preselected
        var total = 0

        for( i in 0..categories.length() ){
            // extract features
            var label: String = ""
            var count: Int = 0
            try {
                label = categories.getJSONArray(i).getString(0)
                count = categories.getJSONArray(i).getInt(1)
            }catch(e: Exception){ continue }

            total += count

            // try to parse
            val cat: Category = Category.fromLabel(label) ?: continue

            // add category
            categoryStore.data.add(CategoryItem(cat, false, count.toFloat()))

            // progress feedback
            val progress = 0.5F + 0.5*i/categories.length()
            runOnUiThread{ underline_animator.animateContinue(progress.toFloat()).during(200).start() }
        }

        for( i in 1..categories.length() ){
            categoryStore.data[i].count /= total
        }

        // 3. update adapter
        runOnUiThread{
            categoryAdapter.notifyDataSetChanged()
            underline_animator.animateContinue(1F).during(10).start()
        }
    }


    private fun getCategories() : MutableList<String> {

        val list = mutableListOf<String>()

        for( item in categoryStore.data ){
            // not selected -> ignore
            if( !item.selected )
                continue;

            // select all -> return empty
            if( item.category == Category.ALL )
                return mutableListOf()

            // else, add each one
            list.add(item.category.label)
        }

        return list
    }
}