//
//  AddItemSheet.swift
//  SportsTime
//
//  Sheet for adding/editing custom itinerary items
//

import SwiftUI

struct AddItemSheet: View {
    @Environment(\.dismiss) private var dismiss
    @Environment(\.colorScheme) private var colorScheme

    let tripId: UUID
    let anchorDay: Int
    let anchorType: CustomItineraryItem.AnchorType
    let anchorId: String?
    let existingItem: CustomItineraryItem?
    var onSave: (CustomItineraryItem) -> Void

    @State private var selectedCategory: CustomItineraryItem.ItemCategory = .restaurant
    @State private var title: String = ""
    @State private var isSaving = false

    private var isEditing: Bool { existingItem != nil }

    var body: some View {
        NavigationStack {
            VStack(spacing: Theme.Spacing.lg) {
                // Category picker
                categoryPicker

                // Title input
                TextField("What's the plan?", text: $title)
                    .textFieldStyle(.roundedBorder)
                    .font(.body)

                Spacer()
            }
            .padding()
            .background(Theme.backgroundGradient(colorScheme))
            .navigationTitle(isEditing ? "Edit Item" : "Add Item")
            .navigationBarTitleDisplayMode(.inline)
            .toolbar {
                ToolbarItem(placement: .cancellationAction) {
                    Button("Cancel") { dismiss() }
                }
                ToolbarItem(placement: .confirmationAction) {
                    Button(isEditing ? "Save" : "Add") {
                        saveItem()
                    }
                    .disabled(title.trimmingCharacters(in: .whitespaces).isEmpty || isSaving)
                }
            }
            .onAppear {
                if let existing = existingItem {
                    selectedCategory = existing.category
                    title = existing.title
                }
            }
        }
    }

    @ViewBuilder
    private var categoryPicker: some View {
        HStack(spacing: Theme.Spacing.md) {
            ForEach(CustomItineraryItem.ItemCategory.allCases, id: \.self) { category in
                CategoryButton(
                    category: category,
                    isSelected: selectedCategory == category
                ) {
                    selectedCategory = category
                }
            }
        }
    }

    private func saveItem() {
        let trimmedTitle = title.trimmingCharacters(in: .whitespaces)
        guard !trimmedTitle.isEmpty else { return }

        isSaving = true

        let item: CustomItineraryItem
        if let existing = existingItem {
            item = CustomItineraryItem(
                id: existing.id,
                tripId: existing.tripId,
                category: selectedCategory,
                title: trimmedTitle,
                anchorType: existing.anchorType,
                anchorId: existing.anchorId,
                anchorDay: existing.anchorDay,
                createdAt: existing.createdAt,
                modifiedAt: Date()
            )
        } else {
            item = CustomItineraryItem(
                tripId: tripId,
                category: selectedCategory,
                title: trimmedTitle,
                anchorType: anchorType,
                anchorId: anchorId,
                anchorDay: anchorDay
            )
        }

        onSave(item)
        dismiss()
    }
}

// MARK: - Category Button

private struct CategoryButton: View {
    let category: CustomItineraryItem.ItemCategory
    let isSelected: Bool
    let action: () -> Void

    var body: some View {
        Button(action: action) {
            VStack(spacing: 4) {
                Text(category.icon)
                    .font(.title2)
                Text(category.label)
                    .font(.caption2)
            }
            .frame(maxWidth: .infinity)
            .padding(.vertical, 12)
            .background(isSelected ? Theme.warmOrange.opacity(0.2) : Color.clear)
            .cornerRadius(8)
            .overlay(
                RoundedRectangle(cornerRadius: 8)
                    .stroke(isSelected ? Theme.warmOrange : Color.secondary.opacity(0.3), lineWidth: isSelected ? 2 : 1)
            )
        }
        .buttonStyle(.plain)
    }
}

#Preview {
    AddItemSheet(
        tripId: UUID(),
        anchorDay: 1,
        anchorType: .startOfDay,
        anchorId: nil,
        existingItem: nil
    ) { _ in }
}