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.Column
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.shape.RoundedCornerShape
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.text.font.FontWeight
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import androidx.core.view.WindowCompat
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 mínima para activar Trazo y elegirlo como teclado. */
class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        WindowCompat.setDecorFitsSystemWindows(window, false)
        setContent {
            TrazoTheme {
                Setup(
                    onActivar = {
                        startActivity(Intent(Settings.ACTION_INPUT_METHOD_SETTINGS))
                    },
                    onElegir = {
                        (getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager)
                            .showInputMethodPicker()
                    },
                )
            }
        }
    }
}

@Composable
private fun Setup(onActivar: () -> Unit, onElegir: () -> Unit) {
    Column(
        Modifier
            .fillMaxSize()
            .background(Vacio)
            .padding(horizontal = 32.dp),
        verticalArrangement = Arrangement.Center,
    ) {
        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(40.dp))
        Paso("1", "activa Trazo en ajustes del sistema", NeonCian, onActivar)
        Spacer(Modifier.height(16.dp))
        Paso("2", "elígelo como teclado actual", NeonRosa, onElegir)
    }
}

@Composable
private fun Paso(num: String, label: String, accent: androidx.compose.ui.graphics.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 = androidx.compose.ui.graphics.Color.White, fontSize = 17.sp)
    }
}