package com.example.ui.admin

import android.content.Intent
import android.net.Uri
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.PaddingValues
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.size
import androidx.compose.foundation.layout.width
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.foundation.lazy.items
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.AccountBalanceWallet
import androidx.compose.material.icons.filled.Call
import androidx.compose.material.icons.filled.Email
import androidx.compose.material.icons.filled.LocationOn
import androidx.compose.material.icons.filled.Person
import androidx.compose.material3.Card
import androidx.compose.material3.CardDefaults
import androidx.compose.material3.HorizontalDivider
import androidx.compose.material3.Icon
import androidx.compose.material3.OutlinedButton
import androidx.compose.material3.Surface
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
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.platform.LocalContext
import androidx.compose.ui.platform.testTag
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import com.example.data.model.CustomerUser
import com.example.ui.theme.FreshVegGreen
import com.example.ui.theme.LoveRedPrimary
import com.example.ui.theme.TextPrimary
import com.example.ui.theme.TextSecondary
import com.example.viewmodel.AdminViewModel

@Composable
fun AdminCustomerScreen(
    adminViewModel: AdminViewModel,
    modifier: Modifier = Modifier
) {
    val context = LocalContext.current
    val customers by adminViewModel.allCustomers.collectAsState()

    Column(
        modifier = modifier
            .fillMaxSize()
            .padding(16.dp)
    ) {
        Row(
            modifier = Modifier.fillMaxWidth(),
            horizontalArrangement = Arrangement.SpaceBetween,
            verticalAlignment = Alignment.CenterVertically
        ) {
            Text(
                text = "REGISTERED CUSTOMERS (${customers.size})",
                fontWeight = FontWeight.Bold,
                fontSize = 13.sp,
                color = TextSecondary
            )
            Surface(
                color = Color(0xFFEDE7F6),
                shape = RoundedCornerShape(8.dp)
            ) {
                Text(
                    text = "Real-Time Sync",
                    color = Color(0xFF512DA8),
                    fontSize = 10.sp,
                    fontWeight = FontWeight.Bold,
                    modifier = Modifier.padding(horizontal = 8.dp, vertical = 4.dp)
                )
            }
        }

        Spacer(modifier = Modifier.height(12.dp))

        if (customers.isEmpty()) {
            Box(
                modifier = Modifier.fillMaxSize(),
                contentAlignment = Alignment.Center
            ) {
                Text(text = "No customers registered yet", color = TextSecondary, fontSize = 14.sp)
            }
        } else {
            LazyColumn(
                modifier = Modifier.fillMaxSize(),
                contentPadding = PaddingValues(bottom = 72.dp),
                verticalArrangement = Arrangement.spacedBy(12.dp)
            ) {
                items(customers) { customer ->
                    CustomerDetailCard(
                        customer = customer,
                        onCall = { phone ->
                            val intent = Intent(Intent.ACTION_DIAL, Uri.parse("tel:$phone"))
                            try { context.startActivity(intent) } catch (_: Exception) {}
                        },
                        onWhatsApp = { phone ->
                            val intent = Intent(Intent.ACTION_VIEW, Uri.parse("https://api.whatsapp.com/send?phone=$phone&text=Hello%20${customer.name},%20regarding%20your%20Love%20Zone%20order"))
                            try { context.startActivity(intent) } catch (_: Exception) {}
                        }
                    )
                }
            }
        }
    }
}

@Composable
fun CustomerDetailCard(
    customer: CustomerUser,
    onCall: (String) -> Unit,
    onWhatsApp: (String) -> Unit
) {
    Card(
        shape = RoundedCornerShape(16.dp),
        colors = CardDefaults.cardColors(containerColor = Color.White),
        elevation = CardDefaults.cardElevation(defaultElevation = 2.dp),
        modifier = Modifier.fillMaxWidth().testTag("admin_customer_card_${customer.phone}")
    ) {
        Column(modifier = Modifier.padding(14.dp)) {
            Row(
                modifier = Modifier.fillMaxWidth(),
                horizontalArrangement = Arrangement.SpaceBetween,
                verticalAlignment = Alignment.CenterVertically
            ) {
                Row(verticalAlignment = Alignment.CenterVertically) {
                    Box(
                        modifier = Modifier
                            .size(40.dp)
                            .clip(CircleShape)
                            .background(Color(0xFFFFF1F2)),
                        contentAlignment = Alignment.Center
                    ) {
                        Icon(
                            imageVector = Icons.Default.Person,
                            contentDescription = null,
                            tint = LoveRedPrimary,
                            modifier = Modifier.size(22.dp)
                        )
                    }
                    Spacer(modifier = Modifier.width(10.dp))
                    Column {
                        Text(text = customer.name, fontWeight = FontWeight.Bold, fontSize = 15.sp, color = TextPrimary)
                        Text(text = customer.phone, fontSize = 12.sp, color = LoveRedPrimary, fontWeight = FontWeight.SemiBold)
                    }
                }

                Surface(
                    color = Color(0xFFF1F5F9),
                    shape = RoundedCornerShape(8.dp)
                ) {
                    Row(
                        modifier = Modifier.padding(horizontal = 8.dp, vertical = 4.dp),
                        verticalAlignment = Alignment.CenterVertically
                    ) {
                        Icon(Icons.Default.AccountBalanceWallet, contentDescription = null, tint = FreshVegGreen, modifier = Modifier.size(14.dp))
                        Spacer(modifier = Modifier.width(4.dp))
                        Text(text = "₹%.1f".format(customer.walletBalance), fontSize = 11.sp, fontWeight = FontWeight.Bold, color = TextPrimary)
                    }
                }
            }

            HorizontalDivider(color = Color(0xFFF1F5F9), modifier = Modifier.padding(vertical = 10.dp))

            if (customer.email.isNotBlank()) {
                Row(verticalAlignment = Alignment.CenterVertically) {
                    Icon(Icons.Default.Email, contentDescription = null, tint = TextSecondary, modifier = Modifier.size(14.dp))
                    Spacer(modifier = Modifier.width(6.dp))
                    Text(text = customer.email, fontSize = 12.sp, color = TextSecondary)
                }
                Spacer(modifier = Modifier.height(4.dp))
            }

            Row(verticalAlignment = Alignment.Top) {
                Icon(Icons.Default.LocationOn, contentDescription = null, tint = LoveRedPrimary, modifier = Modifier.size(14.dp).padding(top = 2.dp))
                Spacer(modifier = Modifier.width(6.dp))
                Text(text = customer.address, fontSize = 12.sp, color = TextSecondary, modifier = Modifier.weight(1f))
            }

            Spacer(modifier = Modifier.height(10.dp))

            Row(
                modifier = Modifier.fillMaxWidth(),
                horizontalArrangement = Arrangement.spacedBy(8.dp)
            ) {
                OutlinedButton(
                    onClick = { onCall(customer.phone) },
                    shape = RoundedCornerShape(8.dp),
                    modifier = Modifier.weight(1f).height(34.dp)
                ) {
                    Icon(Icons.Default.Call, contentDescription = null, tint = LoveRedPrimary, modifier = Modifier.size(14.dp))
                    Spacer(modifier = Modifier.width(4.dp))
                    Text("Call Customer", fontSize = 11.sp, fontWeight = FontWeight.Bold, color = TextPrimary)
                }

                OutlinedButton(
                    onClick = { onWhatsApp(customer.phone) },
                    shape = RoundedCornerShape(8.dp),
                    modifier = Modifier.weight(1f).height(34.dp)
                ) {
                    Text("WhatsApp", fontSize = 11.sp, fontWeight = FontWeight.Bold, color = FreshVegGreen)
                }
            }
        }
    }
}