import SwiftUI
import UniformTypeIdentifiers

enum WorkspaceTool: String, CaseIterable, Identifiable {
    case media = "影视库"
    case scan = "文件扫描与清理"
    case rename = "批量重命名"
    case tmdb = "TMDB 整理"
    case settings = "工作区设置"

    var id: String { rawValue }
    var icon: String {
        switch self {
        case .media: return "play.tv.fill"
        case .scan: return "magnifyingglass.circle.fill"
        case .rename: return "character.cursor.ibeam"
        case .tmdb: return "film.stack"
        case .settings: return "gearshape"
        }
    }
    var subtitle: String {
        switch self {
        case .media: return "海报墙、媒体详情与播放入口"
        case .scan: return "空文件夹、重复文件与相似文件夹统一扫描"
        case .rename: return "按字符、正则和组合规则批量修改名称"
        case .tmdb: return "配置并执行媒体识别整理"
        case .settings: return "代理和本机工具配置"
        }
    }
}

struct WorkspaceView: View {
    @ObservedObject var model: AppModel
    @State private var selectedFileIDs: Set<String> = []
    @State private var renameFile: CloudFile?
    @State private var isCreatingFolder = false
    @State private var isImporting = false
    @State private var isShowingSettings = false
    @State private var isShowingDuplicates = false
    @State private var isInspectorPresented = false
    @State private var selectedTool: WorkspaceTool?
    @State private var folderName = ""
    @State private var columnVisibility: NavigationSplitViewVisibility = .all
    @State private var previewFile: CloudFile?
    @State private var globalSearchText = ""

    private var selectedFile: CloudFile? {
        selectedFileIDs.count == 1 ? model.files.first { $0.id == selectedFileIDs.first } : nil
    }

    var body: some View {
        ZStack {
            AppBackdrop()
            NavigationSplitView(columnVisibility: $columnVisibility) {
                WorkspaceSidebar(model: model, selectedTool: $selectedTool, columnVisibility: $columnVisibility)
                    .navigationSplitViewColumnWidth(min: 210, ideal: 238, max: 280)
            } detail: {
                if let selectedTool {
                    ToolWorkspacePage(model: model, tool: selectedTool)
                } else {
                    FilesBrowser(
                        model: model,
                        selectedFileIDs: $selectedFileIDs,
                        globalSearchText: $globalSearchText,
                        renameFile: $renameFile,
                        isCreatingFolder: $isCreatingFolder,
                        isImporting: $isImporting,
                        isShowingSettings: $isShowingSettings,
                        isShowingDuplicates: $isShowingDuplicates,
                        onPreview: { previewFile = $0 },
                        onOpenTool: { selectedTool = $0 },
                        onShowInspector: { isInspectorPresented = true }
                    )
                    .frame(minWidth: 680, maxWidth: .infinity, maxHeight: .infinity)
                    .inspector(isPresented: $isInspectorPresented) {
                        FileInspector(
                            model: model,
                            file: selectedFile,
                            onPreview: { previewFile = $0 },
                            onClose: { isInspectorPresented = false }
                        )
                        .inspectorColumnWidth(min: 280, ideal: 320, max: 420)
                    }
                }
            }
            .scrollContentBackground(.hidden)
            .toolbar {
                ToolbarItem(placement: .principal) {
                    AppTitleToolbar(model: model, selectedTool: selectedTool, searchText: $globalSearchText)
                }
                ToolbarItem(placement: .primaryAction) {
                    if selectedTool == nil {
                        Button { isInspectorPresented.toggle() } label: {
                            Image(systemName: "sidebar.trailing")
                        }
                        .help(isInspectorPresented ? "隐藏详情检查器" : "显示详情检查器")
                        .accessibilityLabel(isInspectorPresented ? "隐藏详情检查器" : "显示详情检查器")
                        .keyboardShortcut("i", modifiers: [.command, .option])
                        .disabled(selectedFile == nil)
                    }
                }
            }
        }
        .frame(minWidth: 1040, minHeight: 700)
        .sheet(item: $renameFile) { file in RenameSheet(file: file) { name in Task { await model.rename(file, to: name) } } }
        .sheet(isPresented: $isCreatingFolder) {
            CreateFolderSheet(name: $folderName) { name in
                isCreatingFolder = false
                folderName = ""
                Task { await model.createFolder(name: name) }
            } onCancel: { isCreatingFolder = false; folderName = "" }
        }
        .sheet(isPresented: $isShowingSettings) { WorkspaceSettings(model: model) }
        .sheet(isPresented: $isShowingDuplicates) { DuplicateResults(model: model) }
        .sheet(item: $previewFile) { file in FilePreviewSheet(model: model, file: file) }
        .fileImporter(isPresented: $isImporting, allowedContentTypes: [.item], allowsMultipleSelection: false) { result in
            switch result {
            case .success(let urls): if let url = urls.first { Task { await model.upload(url: url) } }
            case .failure(let error): model.errorMessage = error.localizedDescription
            }
        }
        .alert("提示", isPresented: Binding(get: { !model.lastActionMessage.isEmpty }, set: { if !$0 { model.lastActionMessage = "" } })) {
            Button("确定", role: .cancel) { model.lastActionMessage = "" }
        } message: { Text(model.lastActionMessage) }
        .task {
            if model.files.isEmpty && !model.isLoadingFiles { await model.refresh() }
        }
        .onChange(of: selectedTool) { _, tool in
            if tool != nil { isInspectorPresented = false }
        }
        .onChange(of: model.section) { _, _ in
            selectedFileIDs = []
            selectedTool = nil
            isInspectorPresented = false
            globalSearchText = ""
            Task { await model.refresh() }
        }
        .onChange(of: model.files.map(\.id)) { _, ids in
            selectedFileIDs.formIntersection(Set(ids))
            if selectedFileIDs.isEmpty { isInspectorPresented = false }
        }
        .onChange(of: model.folderPath) { _, _ in
            selectedFileIDs = []
            isInspectorPresented = false
            globalSearchText = ""
        }
    }
}

private struct AppTitleToolbar: View {
    @ObservedObject var model: AppModel
    let selectedTool: WorkspaceTool?
    @Binding var searchText: String

    private var supportsSearch: Bool {
        selectedTool == nil && [.files, .photos, .videos, .audio, .documents].contains(model.section)
    }

    var body: some View {
        HStack(spacing: 12) {
            Label(selectedTool?.rawValue ?? model.section.rawValue, systemImage: selectedTool?.icon ?? model.section.icon)
                .font(.headline.weight(.semibold))
            if supportsSearch {
                TextField("搜索当前列表", text: $searchText)
                    .textFieldStyle(.roundedBorder)
                    .frame(width: 260)
            }
        }
    }
}