package it.danieleverducci.lunatracker.fragments

import android.os.Bundle
import android.view.Gravity
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.LinearLayout
import android.widget.TextView
import androidx.fragment.app.Fragment
import it.danieleverducci.lunatracker.R
import it.danieleverducci.lunatracker.StatisticsActivity
import java.text.SimpleDateFormat
import java.util.Date
import java.util.Locale

class GrowthStatsFragment : Fragment() {

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return inflater.inflate(R.layout.fragment_growth_stats, container, false)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        updateUI(view)
    }

    private fun updateUI(view: View) {
        val activity = activity as? StatisticsActivity ?: return
        val calculator = activity.getCalculator()

        val weightHistory = calculator.getWeightHistory()
        val noDataMessage = view.findViewById<TextView>(R.id.no_data_message)

        if (weightHistory.isEmpty()) {
            noDataMessage.visibility = View.VISIBLE
            view.findViewById<View>(R.id.chart_container).visibility = View.GONE
            view.findViewById<View>(R.id.chart_labels).visibility = View.GONE
            view.findViewById<TextView>(R.id.current_weight).visibility = View.GONE
            view.findViewById<TextView>(R.id.weight_gain_week).visibility = View.GONE
            view.findViewById<TextView>(R.id.weight_gain_month).visibility = View.GONE
            return
        }

        noDataMessage.visibility = View.GONE

        // Draw weight chart (line chart approximated with bars)
        val chartContainer = view.findViewById<LinearLayout>(R.id.chart_container)
        val chartLabels = view.findViewById<LinearLayout>(R.id.chart_labels)
        chartContainer.removeAllViews()
        chartLabels.removeAllViews()

        val recentWeights = weightHistory.takeLast(10) // Show last 10 measurements
        val minWeight = recentWeights.minOfOrNull { it.weightGrams } ?: 0
        val maxWeight = recentWeights.maxOfOrNull { it.weightGrams } ?: 1
        val weightRange = (maxWeight - minWeight).coerceAtLeast(100) // At least 100g range
        val dateFormat = SimpleDateFormat("d/M", Locale.getDefault())

        for (point in recentWeights) {
            // Bar container
            val barContainer = LinearLayout(requireContext()).apply {
                layoutParams = LinearLayout.LayoutParams(0, LinearLayout.LayoutParams.MATCH_PARENT, 1f)
                orientation = LinearLayout.VERTICAL
                gravity = Gravity.BOTTOM or Gravity.CENTER_HORIZONTAL
                setPadding(4, 0, 4, 0)
            }

            // Calculate relative height (showing weight above minimum)
            val relativeWeight = point.weightGrams - minWeight + (weightRange * 0.1).toInt()
            val barHeight = (relativeWeight.toFloat() / (weightRange * 1.2) * 100).toInt()

            val bar = View(requireContext()).apply {
                layoutParams = LinearLayout.LayoutParams(
                    LinearLayout.LayoutParams.MATCH_PARENT,
                    (barHeight * resources.displayMetrics.density).toInt()
                )
                setBackgroundColor(resources.getColor(R.color.accent, null))
            }
            barContainer.addView(bar)

            // Weight value on top
            val weightLabel = TextView(requireContext()).apply {
                layoutParams = LinearLayout.LayoutParams(
                    LinearLayout.LayoutParams.WRAP_CONTENT,
                    LinearLayout.LayoutParams.WRAP_CONTENT
                )
                val kg = point.weightGrams / 1000f
                text = String.format(Locale.getDefault(), "%.1f", kg)
                textSize = 8f
                gravity = Gravity.CENTER
            }
            barContainer.addView(weightLabel, 0)

            chartContainer.addView(barContainer)

            // Date label
            val label = TextView(requireContext()).apply {
                layoutParams = LinearLayout.LayoutParams(0, LinearLayout.LayoutParams.WRAP_CONTENT, 1f)
                text = dateFormat.format(Date(point.time * 1000))
                textSize = 10f
                gravity = Gravity.CENTER
            }
            chartLabels.addView(label)
        }

        // Current weight
        val currentWeight = weightHistory.lastOrNull()
        if (currentWeight != null) {
            val kg = currentWeight.weightGrams / 1000f
            view.findViewById<TextView>(R.id.current_weight).text =
                getString(R.string.stats_current_weight, String.format(Locale.getDefault(), "%.2f kg", kg))
        }

        // Weight gain calculations
        val gainWeek = calculator.getWeightGainForDays(7)
        val gainMonth = calculator.getWeightGainForDays(30)

        val weekView = view.findViewById<TextView>(R.id.weight_gain_week)
        val monthView = view.findViewById<TextView>(R.id.weight_gain_month)

        if (gainWeek != null) {
            weekView.text = getString(R.string.stats_weight_gain_week, gainWeek)
            weekView.visibility = View.VISIBLE
        } else {
            weekView.visibility = View.GONE
        }

        if (gainMonth != null) {
            monthView.text = getString(R.string.stats_weight_gain_month, gainMonth)
            monthView.visibility = View.VISIBLE
        } else {
            monthView.visibility = View.GONE
        }
    }
}