package com.santamarta.chamado_gestao

import android.graphics.Bitmap
import android.graphics.Canvas
import android.graphics.Paint
import androidx.compose.foundation.Canvas as ComposeCanvas
import androidx.compose.foundation.background
import androidx.compose.foundation.border
import androidx.compose.foundation.gestures.detectDragGestures
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.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.material3.Button
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.OutlinedButton
import androidx.compose.material3.OutlinedTextField
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateListOf
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.Path
import androidx.compose.ui.graphics.StrokeCap
import androidx.compose.ui.graphics.asAndroidPath
import androidx.compose.ui.input.pointer.pointerInput
import androidx.compose.ui.unit.dp

@Composable
fun SignaturePadDialog(
    onDismiss: () -> Unit,
    onSave: (nome: String, documento: String, observacao: String, bitmap: Bitmap) -> Unit
) {
    var nome by remember { mutableStateOf("") }
    var documento by remember { mutableStateOf("") }
    var observacao by remember { mutableStateOf("") }
    val points = remember { mutableStateListOf<Offset>() }

    Column(
        modifier = Modifier
            .fillMaxWidth()
            .padding(16.dp),
        verticalArrangement = Arrangement.spacedBy(10.dp)
    ) {
        Text("Ciência local", style = MaterialTheme.typography.titleMedium)

        OutlinedTextField(
            value = nome,
            onValueChange = { nome = it },
            label = { Text("Nome do assinante") },
            modifier = Modifier.fillMaxWidth()
        )

        OutlinedTextField(
            value = documento,
            onValueChange = { documento = it },
            label = { Text("Documento / matrícula") },
            modifier = Modifier.fillMaxWidth()
        )

        OutlinedTextField(
            value = observacao,
            onValueChange = { observacao = it },
            label = { Text("Observação") },
            modifier = Modifier.fillMaxWidth()
        )

        Box(
            modifier = Modifier
                .fillMaxWidth()
                .height(220.dp)
                .background(Color.White, RoundedCornerShape(12.dp))
                .border(1.dp, Color.Gray, RoundedCornerShape(12.dp))
                .pointerInput(Unit) {
                    detectDragGestures(
                        onDragStart = { offset -> points.add(offset) },
                        onDrag = { change, _ -> points.add(change.position) }
                    )
                }
        ) {
            ComposeCanvas(modifier = Modifier.fillMaxWidth().height(220.dp)) {
                val path = Path()
                points.forEachIndexed { index, offset ->
                    if (index == 0) path.moveTo(offset.x, offset.y)
                    else path.lineTo(offset.x, offset.y)
                }
                drawPath(path = path, color = Color.Black, style = androidx.compose.ui.graphics.drawscope.Stroke(width = 4f, cap = StrokeCap.Round))
            }
        }

        Row(horizontalArrangement = Arrangement.spacedBy(10.dp)) {
            OutlinedButton(onClick = { points.clear() }) { Text("Limpar") }
            OutlinedButton(onClick = onDismiss) { Text("Cancelar") }
            Button(
                onClick = {
                    if (nome.isBlank() || points.size < 2) return@Button
                    val bitmap = Bitmap.createBitmap(1000, 420, Bitmap.Config.ARGB_8888)
                    val canvas = Canvas(bitmap)
                    canvas.drawColor(android.graphics.Color.WHITE)
                    val paint = Paint().apply {
                        color = android.graphics.Color.BLACK
                        strokeWidth = 6f
                        style = Paint.Style.STROKE
                        isAntiAlias = true
                    }
                    val androidPath = Path().apply {
                        points.forEachIndexed { index, offset ->
                            if (index == 0) moveTo(offset.x * 2f, offset.y * 2f)
                            else lineTo(offset.x * 2f, offset.y * 2f)
                        }
                    }.asAndroidPath()
                    canvas.drawPath(androidPath, paint)
                    onSave(nome.trim(), documento.trim(), observacao.trim(), bitmap)
                }
            ) { Text("Salvar assinatura") }
        }
    }
}