package org.terst.doot.widget.ui

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.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.foundation.text.KeyboardOptions
import androidx.compose.material3.AlertDialog
import androidx.compose.material3.OutlinedTextField
import androidx.compose.material3.Text
import androidx.compose.material3.TextButton
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.text.input.ImeAction
import androidx.compose.ui.unit.dp
import org.terst.doot.widget.data.Project

private val PROJECT_COLOR_CHOICES = listOf(
    "#3B82F6", "#EF4444", "#F59E0B", "#10B981", "#8B5CF6", "#EC4899", "#6B7280"
)

/** Parses a "#RRGGBB" string into a Compose Color, defaulting to gray on failure. */
internal fun parseHexColor(hex: String): Color = runCatching {
    Color(android.graphics.Color.parseColor(hex))
}.getOrDefault(Color.Gray)

@Composable
fun ProjectPickerDialog(
    projects: List<Project>,
    onDismiss: () -> Unit,
    onSelect: (projectId: String) -> Unit,
    onClear: () -> Unit,
    onCreate: (name: String, color: String) -> Unit
) {
    var newName by remember { mutableStateOf("") }
    var newColor by remember { mutableStateOf(PROJECT_COLOR_CHOICES.first()) }

    AlertDialog(
        onDismissRequest = onDismiss,
        title = { Text("Project") },
        text = {
            Column(verticalArrangement = Arrangement.spacedBy(4.dp)) {
                projects.forEach { project ->
                    Row(
                        modifier = Modifier
                            .fillMaxWidth()
                            .clickable { onSelect(project.id) }
                            .padding(vertical = 8.dp),
                        verticalAlignment = Alignment.CenterVertically
                    ) {
                        Box(
                            modifier = Modifier
                                .size(14.dp)
                                .background(parseHexColor(project.color), CircleShape)
                        )
                        Text(project.name, modifier = Modifier.padding(start = 10.dp))
                    }
                }
                Text("New project", modifier = Modifier.padding(top = 12.dp, bottom = 4.dp))
                OutlinedTextField(
                    value = newName,
                    onValueChange = { newName = it },
                    singleLine = true,
                    keyboardOptions = KeyboardOptions(imeAction = ImeAction.Done),
                    modifier = Modifier.fillMaxWidth()
                )
                Row(horizontalArrangement = Arrangement.spacedBy(6.dp), modifier = Modifier.padding(top = 8.dp)) {
                    PROJECT_COLOR_CHOICES.forEach { hex ->
                        val isSelected = hex == newColor
                        Box(
                            modifier = Modifier
                                .size(24.dp)
                                .background(parseHexColor(hex), CircleShape)
                                .then(
                                    if (isSelected) Modifier.border(2.dp, Color.White, CircleShape)
                                    else Modifier
                                )
                                .clickable { newColor = hex }
                        )
                    }
                }
            }
        },
        confirmButton = {
            TextButton(
                onClick = { onCreate(newName, newColor) },
                enabled = newName.isNotBlank()
            ) { Text("Create") }
        },
        dismissButton = {
            Row {
                TextButton(onClick = onClear) { Text("Clear") }
                TextButton(onClick = onDismiss) { Text("Cancel") }
            }
        }
    )
}