//
//  CreateTravelAlbumSheet.swift
//  suixinkan
//
//  Created by Codex on 2026/6/29.
//

import SwiftUI

/// 新建相册任务弹窗，支持先拍再买与买了再拍两种模式。
struct CreateTravelAlbumSheet: View {
    let orders: [TravelAlbumAvailableOrder]
    let isCreating: Bool
    let onConfirm: (Int, String, String, String, TravelAlbumAvailableOrder?) -> Void

    @Environment(\.dismiss) private var dismiss

    @State private var mode = TravelAlbumEntryViewModel.modePreShoot
    @State private var freeCount = ""
    @State private var singlePrice = ""
    @State private var packagePrice = ""
    @State private var selectedOrder: TravelAlbumAvailableOrder?

    var body: some View {
        NavigationStack {
            ScrollView {
                VStack(spacing: AppMetrics.Spacing.medium) {
                    modeCard(
                        title: "先拍再买",
                        description: "拍完后分享给用户，用户在小程序上选择性购买",
                        selected: mode == TravelAlbumEntryViewModel.modePreShoot
                    ) {
                        mode = TravelAlbumEntryViewModel.modePreShoot
                    }

                    modeCard(
                        title: "买了再拍",
                        description: "用户已在小程序下单，绑定订单后用户可直接选片",
                        selected: mode == TravelAlbumEntryViewModel.modePreOrder
                    ) {
                        mode = TravelAlbumEntryViewModel.modePreOrder
                    }

                    if mode == TravelAlbumEntryViewModel.modePreShoot {
                        preShootFields
                    } else {
                        preOrderFields
                    }
                }
                .padding(AppMetrics.Spacing.pageHorizontal)
                .padding(.vertical, AppMetrics.Spacing.medium)
            }
            .background(Color(hex: 0xF5F7FA))
            .navigationTitle("新建相册任务")
            .navigationBarTitleDisplayMode(.inline)
            .toolbar {
                ToolbarItem(placement: .cancellationAction) {
                    Button("取消") { dismiss() }
                }
                ToolbarItem(placement: .confirmationAction) {
                    Button(isCreating ? "创建中" : "确认创建") {
                        onConfirm(mode, freeCount, singlePrice, packagePrice, selectedOrder)
                    }
                    .disabled(isCreating)
                }
            }
        }
    }

    private var preShootFields: some View {
        VStack(spacing: AppMetrics.Spacing.small) {
            fieldRow(title: "免费张数", placeholder: "请输入免费张数", text: $freeCount, keyboard: .numberPad)
            fieldRow(title: "单张价格(元)", placeholder: "请输入单张照片价格", text: $singlePrice, keyboard: .decimalPad)
            fieldRow(title: "打包价(元)", placeholder: "可选", text: $packagePrice, keyboard: .decimalPad)
        }
    }

    private var preOrderFields: some View {
        VStack(alignment: .leading, spacing: AppMetrics.Spacing.small) {
            Text("选择绑定订单")
                .font(.system(size: AppMetrics.FontSize.subheadline, weight: .medium))
                .foregroundStyle(AppDesign.textSecondary)

            if orders.isEmpty {
                Text("暂无可绑定订单")
                    .foregroundStyle(AppDesign.placeholder)
                    .frame(maxWidth: .infinity, alignment: .leading)
                    .padding()
                    .background(Color.white)
                    .clipShape(RoundedRectangle(cornerRadius: AppMetrics.CornerRadius.card))
            } else {
                ForEach(orders) { order in
                    Button {
                        selectedOrder = order
                    } label: {
                        HStack {
                            VStack(alignment: .leading, spacing: 4) {
                                Text(order.projectName)
                                    .font(.system(size: AppMetrics.FontSize.body, weight: .medium))
                                    .foregroundStyle(AppDesign.textPrimary)
                                Text("\(order.orderNumber) · \(order.userPhone)")
                                    .font(.system(size: AppMetrics.FontSize.caption))
                                    .foregroundStyle(AppDesign.textSecondary)
                            }
                            Spacer()
                            Image(systemName: selectedOrder?.orderNumber == order.orderNumber ? "checkmark.circle.fill" : "circle")
                                .foregroundStyle(selectedOrder?.orderNumber == order.orderNumber ? AppDesign.primary : AppDesign.placeholder)
                        }
                        .padding(AppMetrics.Spacing.medium)
                        .background(Color.white)
                        .clipShape(RoundedRectangle(cornerRadius: AppMetrics.CornerRadius.card))
                    }
                    .buttonStyle(.plain)
                }
            }
        }
    }

    private func modeCard(title: String, description: String, selected: Bool, action: @escaping () -> Void) -> some View {
        Button(action: action) {
            HStack(alignment: .top, spacing: AppMetrics.Spacing.medium) {
                Image(systemName: selected ? "largecircle.fill.circle" : "circle")
                    .foregroundStyle(selected ? AppDesign.primary : AppDesign.placeholder)
                VStack(alignment: .leading, spacing: 4) {
                    Text(title)
                        .font(.system(size: AppMetrics.FontSize.body, weight: .semibold))
                        .foregroundStyle(AppDesign.textPrimary)
                    Text(description)
                        .font(.system(size: AppMetrics.FontSize.caption))
                        .foregroundStyle(AppDesign.textSecondary)
                        .multilineTextAlignment(.leading)
                }
                Spacer()
            }
            .padding(AppMetrics.Spacing.large)
            .background(Color.white)
            .overlay(
                RoundedRectangle(cornerRadius: AppMetrics.CornerRadius.card)
                    .stroke(selected ? AppDesign.primary : Color.clear, lineWidth: 1.5)
            )
            .clipShape(RoundedRectangle(cornerRadius: AppMetrics.CornerRadius.card))
        }
        .buttonStyle(.plain)
    }

    private func fieldRow(title: String, placeholder: String, text: Binding<String>, keyboard: UIKeyboardType) -> some View {
        VStack(alignment: .leading, spacing: 6) {
            Text(title)
                .font(.system(size: AppMetrics.FontSize.caption))
                .foregroundStyle(AppDesign.textSecondary)
            TextField(placeholder, text: text)
                .keyboardType(keyboard)
                .padding(AppMetrics.Spacing.medium)
                .background(Color.white)
                .clipShape(RoundedRectangle(cornerRadius: AppMetrics.CornerRadius.card))
        }
    }
}