package com.rizoma.trazo

import android.content.Context
import android.content.Intent
import android.os.Bundle
import android.provider.Settings
import android.view.inputmethod.InputMethodManager
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.background
import androidx.compose.foundation.border
import androidx.compose.foundation.clickable
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.width
import androidx.compose.foundation.rememberScrollState
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.foundation.verticalScroll
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import androidx.core.view.WindowCompat
import androidx.lifecycle.lifecycleScope
import com.rizoma.trazo.data.HapticLevel
import com.rizoma.trazo.data.TrazoSettings
import com.rizoma.trazo.ui.theme.NeonCian
import com.rizoma.trazo.ui.theme.NeonRosa
import com.rizoma.trazo.ui.theme.NeonVerde
import com.rizoma.trazo.ui.theme.Tecla
import com.rizoma.trazo.ui.theme.Tenue
import com.rizoma.trazo.ui.theme.TrazoTheme
import com.rizoma.trazo.ui.theme.Vacio

/** Pantalla para activar Trazo, elegirlo como teclado y ajustar sus preferencias. */
class MainActivity : ComponentActivity() {

    private lateinit var settings: TrazoSettings

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        settings = TrazoSettings(this, lifecycleScope)
        WindowCompat.setDecorFitsSystemWindows(window, false)
        setContent {
            TrazoTheme {
                Setup(
                    settings = settings,
                    onActivar = { startActivity(Intent(Settings.ACTION_INPUT_METHOD_SETTINGS)) },
                    onElegir = {
                        (getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager)
                            .showInputMethodPicker()
                    },
                )
            }
        }
    }
}

@Composable
private fun Setup(settings: TrazoSettings, onActivar: () -> Unit, onElegir: () -> Unit) {
    Column(
        Modifier
            .fillMaxSize()
            .background(Vacio)
            .verticalScroll(rememberScrollState())
            .padding(horizontal = 32.dp, vertical = 56.dp),
    ) {
        Text("Trazo", color = NeonVerde, fontSize = 44.sp, fontWeight = FontWeight.Light)
        Spacer(Modifier.height(8.dp))
        Text("teclado de trazos — un toque, ocho gestos.", color = Tenue, fontSize = 15.sp)
        Spacer(Modifier.height(36.dp))

        Paso("1", "activa Trazo en ajustes del sistema", NeonCian, onActivar)
        Spacer(Modifier.height(16.dp))
        Paso("2", "elígelo como teclado actual", NeonRosa, onElegir)

        Spacer(Modifier.height(40.dp))
        Seccion("ajustes")
        Spacer(Modifier.height(12.dp))

        Toggle("vibración al teclear", settings.haptics, NeonCian) { settings.setHaptics(it) }
        if (settings.haptics) {
            Spacer(Modifier.height(10.dp))
            NivelHaptico(settings.hapticLevel) { settings.setHapticLevel(it) }
        }

        Spacer(Modifier.height(10.dp))
        Toggle("doble espacio → punto", settings.doubleSpacePeriod, NeonVerde) {
            settings.setDoubleSpacePeriod(it)
        }

        Spacer(Modifier.height(24.dp))
        Seccion("idiomas de predicción")
        Spacer(Modifier.height(12.dp))
        Toggle("español", settings.spanish, NeonRosa) { settings.setSpanish(it) }
        Spacer(Modifier.height(10.dp))
        Toggle("inglés", settings.english, NeonCian) { settings.setEnglish(it) }
    }
}

@Composable
private fun Seccion(titulo: String) {
    Text(titulo, color = Tenue, fontSize = 13.sp, fontWeight = FontWeight.Medium)
}

@Composable
private fun Paso(num: String, label: String, accent: Color, onClick: () -> Unit) {
    Column(
        Modifier
            .fillMaxWidth()
            .clip(RoundedCornerShape(18.dp))
            .background(Tecla)
            .border(1.dp, accent.copy(alpha = 0.4f), RoundedCornerShape(18.dp))
            .clickable(onClick = onClick)
            .padding(20.dp),
    ) {
        Text(num, color = accent, fontSize = 13.sp, fontWeight = FontWeight.Bold)
        Spacer(Modifier.height(6.dp))
        Text(label, color = Color.White, fontSize = 17.sp)
    }
}

@Composable
private fun Toggle(label: String, value: Boolean, accent: Color, onChange: (Boolean) -> Unit) {
    Row(
        Modifier
            .fillMaxWidth()
            .clip(RoundedCornerShape(14.dp))
            .background(Tecla)
            .clickable { onChange(!value) }
            .padding(horizontal = 18.dp, vertical = 16.dp),
        verticalAlignment = Alignment.CenterVertically,
    ) {
        Text(label, color = Color.White, fontSize = 16.sp, modifier = Modifier.weight(1f))
        Pill(value, accent)
    }
}

/** Indicador tipo interruptor: relleno y a la derecha cuando está activo. */
@Composable
private fun Pill(on: Boolean, accent: Color) {
    Box(
        Modifier
            .width(46.dp)
            .height(26.dp)
            .clip(RoundedCornerShape(13.dp))
            .background(if (on) accent.copy(alpha = 0.28f) else Color(0xFF1B1B26))
            .border(1.dp, if (on) accent else Tenue, RoundedCornerShape(13.dp)),
        contentAlignment = if (on) Alignment.CenterEnd else Alignment.CenterStart,
    ) {
        Box(
            Modifier
                .padding(3.dp)
                .width(20.dp)
                .height(20.dp)
                .clip(RoundedCornerShape(10.dp))
                .background(if (on) accent else Tenue),
        )
    }
}

@Composable
private fun NivelHaptico(level: HapticLevel, onSelect: (HapticLevel) -> Unit) {
    Row(Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.spacedBy(8.dp)) {
        HapticLevel.entries.forEach { opt ->
            val selected = opt == level
            Box(
                Modifier
                    .weight(1f)
                    .clip(RoundedCornerShape(12.dp))
                    .background(if (selected) NeonCian.copy(alpha = 0.18f) else Tecla)
                    .border(
                        1.dp,
                        if (selected) NeonCian else Tenue.copy(alpha = 0.4f),
                        RoundedCornerShape(12.dp),
                    )
                    .clickable { onSelect(opt) }
                    .padding(vertical = 12.dp),
                contentAlignment = Alignment.Center,
            ) {
                Text(
                    text = opt.name.lowercase(),
                    color = if (selected) NeonCian else Tenue,
                    fontSize = 14.sp,
                )
            }
        }
    }
}