//
//  TaskDetailView.swift
//  suixinkan
//
//  Created by Codex on 2026/6/23.
//

import SwiftUI

/// 任务详情页面，展示任务基础信息、关联订单和任务结果。
struct TaskDetailView: View {
    @Environment(\.taskAPI) private var taskAPI
    @EnvironmentObject private var toastCenter: ToastCenter
    @Environment(\.globalLoading) private var globalLoading

    let taskId: Int
    let summary: PhotographerTaskItem?

    @StateObject private var viewModel = TaskDetailViewModel()

    var body: some View {
        ScrollView {
            VStack(spacing: AppMetrics.Spacing.medium) {
                headerSection
                orderSection
                resultSection
            }
            .padding(AppMetrics.Spacing.pageHorizontal)
        }
        .background(Color(hex: 0xF5F7FA))
        .navigationTitle("任务详情")
        .navigationBarTitleDisplayMode(.inline)
        .task {
            await globalLoading.withOptionalLoading(viewModel.detail == nil) {
                await viewModel.load(api: taskAPI, taskId: taskId)
            }
            if let message = viewModel.errorMessage {
                toastCenter.show(message)
            }
        }
    }

    /// 任务头部信息区域。
    private var headerSection: some View {
        VStack(alignment: .leading, spacing: AppMetrics.Spacing.small) {
            HStack(alignment: .top) {
                Text(displayName)
                    .font(.system(size: AppMetrics.FontSize.title3, weight: .semibold))
                    .foregroundStyle(AppDesign.textPrimary)
                    .lineLimit(2)
                Spacer()
                Text(displayStatus)
                    .font(.system(size: AppMetrics.FontSize.caption, weight: .semibold))
                    .foregroundStyle(AppDesign.primary)
                    .padding(.horizontal, AppMetrics.Spacing.small)
                    .padding(.vertical, AppMetrics.Spacing.xxSmall)
                    .background(AppDesign.primarySoft, in: Capsule())
            }

            TaskInfoRow(title: "任务备注", value: detail?.photogRemark ?? summary?.photogRemark ?? "暂无")
            TaskInfoRow(title: "创建时间", value: detail?.createdAt ?? summary?.createdAt ?? "暂无")
            TaskInfoRow(title: "紧急小时", value: detail.map { "\($0.urgentHour) 小时" } ?? "暂无")
            TaskInfoRow(title: "编辑人员", value: detail?.editorName.nonEmpty ?? summary?.editorName.nonEmpty ?? "暂无")
            TaskInfoRow(title: "编辑电话", value: detail?.editorPhone.nonEmpty ?? "暂无")
        }
        .padding(AppMetrics.Spacing.medium)
        .background(.white, in: RoundedRectangle(cornerRadius: AppMetrics.CornerRadius.card))
    }

    /// 关联订单区域。
    private var orderSection: some View {
        VStack(alignment: .leading, spacing: AppMetrics.Spacing.small) {
            Text("关联订单")
                .font(.system(size: AppMetrics.FontSize.body, weight: .semibold))
                .foregroundStyle(AppDesign.textPrimary)

            TaskInfoRow(title: "项目名称", value: detail?.order?.projectName.nonEmpty ?? summary?.orderUserNickname.nonEmpty ?? "暂无")
            TaskInfoRow(title: "订单号", value: detail?.order?.orderNumber.nonEmpty ?? summary?.orderNumber.nonEmpty ?? "暂无")
            TaskInfoRow(title: "手机号", value: detail?.order?.userPhone.nonEmpty ?? summary?.orderUserPhone.nonEmpty ?? "暂无")
            TaskInfoRow(title: "支付时间", value: detail?.order?.payTime.nonEmpty ?? "暂无")
        }
        .padding(AppMetrics.Spacing.medium)
        .background(.white, in: RoundedRectangle(cornerRadius: AppMetrics.CornerRadius.card))
    }

    /// 任务结果区域。
    private var resultSection: some View {
        VStack(alignment: .leading, spacing: AppMetrics.Spacing.small) {
            Text("任务结果")
                .font(.system(size: AppMetrics.FontSize.body, weight: .semibold))
                .foregroundStyle(AppDesign.textPrimary)

            if mediaItems.isEmpty {
                Text("暂无任务结果文件")
                    .font(.system(size: AppMetrics.FontSize.subheadline))
                    .foregroundStyle(AppDesign.textSecondary)
                    .frame(maxWidth: .infinity, alignment: .leading)
                    .padding(.vertical, AppMetrics.Spacing.small)
            } else {
                LazyVGrid(columns: [GridItem(.adaptive(minimum: 92), spacing: AppMetrics.Spacing.small)], spacing: AppMetrics.Spacing.small) {
                    ForEach(mediaItems) { media in
                        TaskMediaThumbView(media: media)
                    }
                }
            }
        }
        .padding(AppMetrics.Spacing.medium)
        .background(.white, in: RoundedRectangle(cornerRadius: AppMetrics.CornerRadius.card))
    }

    /// 当前已加载的详情。
    private var detail: TaskDetailResponse? {
        viewModel.detail
    }

    /// 展示任务名称。
    private var displayName: String {
        detail?.name.nonEmpty ?? summary?.name.nonEmpty ?? "未命名任务"
    }

    /// 展示任务状态。
    private var displayStatus: String {
        detail?.taskStatusLabel.nonEmpty ?? summary?.statusName.nonEmpty ?? "未知"
    }

    /// 展示任务媒体列表。
    private var mediaItems: [TaskMediaItem] {
        if let detail {
            return detail.taskResult
        }
        return summary?.media ?? []
    }
}

/// 任务信息行，展示左右结构的标题和值。
private struct TaskInfoRow: View {
    let title: String
    let value: String

    var body: some View {
        HStack(alignment: .top, spacing: AppMetrics.Spacing.medium) {
            Text(title)
                .font(.system(size: AppMetrics.FontSize.subheadline))
                .foregroundStyle(AppDesign.textSecondary)
                .frame(width: 72, alignment: .leading)
            Text(value.isEmpty ? "暂无" : value)
                .font(.system(size: AppMetrics.FontSize.subheadline))
                .foregroundStyle(AppDesign.textPrimary)
                .frame(maxWidth: .infinity, alignment: .leading)
        }
    }
}

/// 任务媒体缩略图视图，使用 Kingfisher 加载网络图片。
private struct TaskMediaThumbView: View {
    let media: TaskMediaItem

    var body: some View {
        ZStack(alignment: .bottomLeading) {
            RemoteImage(urlString: media.displayURL) {
                Image(systemName: media.isVideo ? "video.fill" : "photo")
                    .font(.system(size: 28, weight: .semibold))
                    .foregroundStyle(AppDesign.placeholder)
                    .frame(maxWidth: .infinity, maxHeight: .infinity)
                    .background(Color(hex: 0xEEF2F7))
            }
            .frame(height: 92)
            .clipShape(RoundedRectangle(cornerRadius: AppMetrics.CornerRadius.input))

            if media.isVideo {
                Image(systemName: "play.circle.fill")
                    .font(.system(size: 20, weight: .semibold))
                    .foregroundStyle(.white)
                    .padding(AppMetrics.Spacing.xSmall)
            }
        }
    }
}

private extension String {
    /// 去除空白后返回非空字符串。
    var nonEmpty: String? {
        let text = trimmingCharacters(in: .whitespacesAndNewlines)
        return text.isEmpty ? nil : text
    }
}