package com.example.ui.admin

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.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.Person
import androidx.compose.material.icons.filled.Phone
import androidx.compose.material.icons.filled.Star
import androidx.compose.material.icons.filled.StarHalf
import androidx.compose.material3.Card
import androidx.compose.material3.CardDefaults
import androidx.compose.material3.Icon
import androidx.compose.material3.OutlinedTextField
import androidx.compose.material3.OutlinedTextFieldDefaults
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.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.draw.clip
import androidx.compose.ui.graphics.Color
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.FoodReview
import com.example.ui.theme.AccentGold
import com.example.ui.theme.LoveBlack
import com.example.ui.theme.LoveRedPrimary
import com.example.ui.theme.TextPrimary
import com.example.ui.theme.TextSecondary
import com.example.viewmodel.AdminViewModel
import java.text.SimpleDateFormat
import java.util.Date
import java.util.Locale

@Composable
fun AdminReviewsScreen(
    adminViewModel: AdminViewModel,
    modifier: Modifier = Modifier
) {
    val reviews by adminViewModel.allReviews.collectAsState()
    var searchQuery by remember { mutableStateOf("") }

    val filteredReviews = remember(reviews, searchQuery) {
        if (searchQuery.isBlank()) reviews
        else reviews.filter {
            it.foodName.contains(searchQuery, ignoreCase = true) ||
            it.customerName.contains(searchQuery, ignoreCase = true) ||
            it.reviewText.contains(searchQuery, ignoreCase = true)
        }
    }

    val avgRating = if (reviews.isNotEmpty()) reviews.map { it.rating }.average() else 4.8

    Column(
        modifier = modifier
            .fillMaxSize()
            .background(Color(0xFFF4F5F7))
            .padding(16.dp)
    ) {
        // Summary Card
        Card(
            shape = RoundedCornerShape(16.dp),
            colors = CardDefaults.cardColors(containerColor = LoveBlack),
            modifier = Modifier.fillMaxWidth()
        ) {
            Row(
                modifier = Modifier
                    .fillMaxWidth()
                    .padding(16.dp),
                horizontalArrangement = Arrangement.SpaceBetween,
                verticalAlignment = Alignment.CenterVertically
            ) {
                Column {
                    Text(
                        text = "Customer Ratings & Feedback",
                        fontSize = 18.sp,
                        fontWeight = FontWeight.Bold,
                        color = Color.White
                    )
                    Spacer(modifier = Modifier.height(4.dp))
                    Text(
                        text = "Total ${reviews.size} Customer Reviews Received",
                        fontSize = 13.sp,
                        color = Color.LightGray
                    )
                }

                Surface(
                    shape = RoundedCornerShape(12.dp),
                    color = AccentGold
                ) {
                    Row(
                        modifier = Modifier.padding(horizontal = 12.dp, vertical = 6.dp),
                        verticalAlignment = Alignment.CenterVertically
                    ) {
                        Icon(
                            imageVector = Icons.Default.Star,
                            contentDescription = null,
                            tint = Color.White,
                            modifier = Modifier.size(20.dp)
                        )
                        Spacer(modifier = Modifier.width(6.dp))
                        Text(
                            text = String.format(Locale.getDefault(), "%.1f", avgRating),
                            fontSize = 18.sp,
                            fontWeight = FontWeight.Bold,
                            color = Color.White
                        )
                    }
                }
            }
        }

        Spacer(modifier = Modifier.height(16.dp))

        // Search Bar (with black input text so user can read what they type)
        OutlinedTextField(
            value = searchQuery,
            onValueChange = { searchQuery = it },
            placeholder = { Text("Search by dish, customer, or comment...") },
            colors = OutlinedTextFieldDefaults.colors(
                focusedTextColor = Color.Black,
                unfocusedTextColor = Color.Black,
                focusedBorderColor = LoveRedPrimary,
                unfocusedBorderColor = Color.LightGray,
                focusedContainerColor = Color.White,
                unfocusedContainerColor = Color.White
            ),
            modifier = Modifier
                .fillMaxWidth()
                .testTag("admin_reviews_search"),
            shape = RoundedCornerShape(12.dp),
            singleLine = true
        )

        Spacer(modifier = Modifier.height(16.dp))

        if (filteredReviews.isEmpty()) {
            Box(
                modifier = Modifier
                    .fillMaxSize()
                    .padding(top = 40.dp),
                contentAlignment = Alignment.TopCenter
            ) {
                Text(
                    text = "No customer reviews found matching search.",
                    fontSize = 15.sp,
                    color = TextSecondary
                )
            }
        } else {
            LazyColumn(
                verticalArrangement = Arrangement.spacedBy(12.dp),
                modifier = Modifier.fillMaxSize()
            ) {
                items(filteredReviews) { review ->
                    AdminReviewCard(review = review)
                }
            }
        }
    }
}

@Composable
fun AdminReviewCard(review: FoodReview) {
    val dateStr = remember(review.timestamp) {
        val formatter = SimpleDateFormat("dd MMM yyyy, hh:mm a", Locale.getDefault())
        formatter.format(Date(review.timestamp))
    }

    Card(
        shape = RoundedCornerShape(14.dp),
        colors = CardDefaults.cardColors(containerColor = Color.White),
        elevation = CardDefaults.cardElevation(defaultElevation = 2.dp),
        modifier = Modifier.fillMaxWidth()
    ) {
        Column(
            modifier = Modifier
                .fillMaxWidth()
                .padding(16.dp)
        ) {
            Row(
                modifier = Modifier.fillMaxWidth(),
                horizontalArrangement = Arrangement.SpaceBetween,
                verticalAlignment = Alignment.Top
            ) {
                Column(modifier = Modifier.weight(1f)) {
                    Text(
                        text = review.foodName,
                        fontSize = 16.sp,
                        fontWeight = FontWeight.Bold,
                        color = LoveRedPrimary
                    )
                    Spacer(modifier = Modifier.height(4.dp))
                    Row(verticalAlignment = Alignment.CenterVertically) {
                        Icon(
                            imageVector = Icons.Default.Person,
                            contentDescription = null,
                            tint = TextSecondary,
                            modifier = Modifier.size(14.dp)
                        )
                        Spacer(modifier = Modifier.width(4.dp))
                        Text(
                            text = review.customerName,
                            fontSize = 13.sp,
                            fontWeight = FontWeight.SemiBold,
                            color = TextPrimary
                        )
                        if (review.customerPhone.isNotBlank()) {
                            Spacer(modifier = Modifier.width(8.dp))
                            Icon(
                                imageVector = Icons.Default.Phone,
                                contentDescription = null,
                                tint = TextSecondary,
                                modifier = Modifier.size(12.dp)
                            )
                            Spacer(modifier = Modifier.width(2.dp))
                            Text(
                                text = review.customerPhone,
                                fontSize = 12.sp,
                                color = TextSecondary
                            )
                        }
                    }
                }

                Surface(
                    shape = RoundedCornerShape(8.dp),
                    color = AccentGold
                ) {
                    Row(
                        modifier = Modifier.padding(horizontal = 8.dp, vertical = 4.dp),
                        verticalAlignment = Alignment.CenterVertically
                    ) {
                        Icon(
                            imageVector = Icons.Default.Star,
                            contentDescription = null,
                            tint = Color.White,
                            modifier = Modifier.size(16.dp)
                        )
                        Spacer(modifier = Modifier.width(4.dp))
                        Text(
                            text = "${review.rating.toInt()}★",
                            color = Color.White,
                            fontWeight = FontWeight.Bold,
                            fontSize = 14.sp
                        )
                    }
                }
            }

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

            // Written Comment Box ("kya likh kar rating kiya hai")
            Surface(
                shape = RoundedCornerShape(10.dp),
                color = Color(0xFFF8F9FA),
                modifier = Modifier.fillMaxWidth()
            ) {
                Column(modifier = Modifier.padding(12.dp)) {
                    Text(
                        text = "Customer Written Comment:",
                        fontSize = 11.sp,
                        fontWeight = FontWeight.Bold,
                        color = TextSecondary
                    )
                    Spacer(modifier = Modifier.height(4.dp))
                    Text(
                        text = "\"${review.reviewText}\"",
                        fontSize = 14.sp,
                        fontWeight = FontWeight.Medium,
                        color = LoveBlack,
                        lineHeight = 18.sp
                    )
                }
            }

            Spacer(modifier = Modifier.height(8.dp))
            Text(
                text = "Submitted: $dateStr",
                fontSize = 11.sp,
                color = Color.Gray,
                modifier = Modifier.align(Alignment.End)
            )
        }
    }
}