import SwiftUI

struct ContentView: View {
    @Bindable var model: ScanViewModel

    @State private var isConfirmingTrash = false

    var body: some View {
        NavigationSplitView {
            GroupListView(model: model)
                .navigationSplitViewColumnWidth(min: 270, ideal: 310, max: 420)
        } detail: {
            if let group = model.selectedGroup {
                GroupDetailView(model: model, group: group)
            } else {
                placeholder
            }
        }
        .toolbar { ScanToolbar(model: model, isConfirmingTrash: $isConfirmingTrash) }
        .overlay {
            if let progress = model.progress {
                Color.black.opacity(0.12).ignoresSafeArea()
                ScanProgressView(progress: progress) { model.cancelScan() }
            }
        }
        .confirmationDialog(
            "\(model.markedCount) 枚をゴミ箱へ移動します",
            isPresented: $isConfirmingTrash,
            titleVisibility: .visible
        ) {
            Button("ゴミ箱へ移動（\(model.markedBytesText)）", role: .destructive) {
                Task { await model.moveMarkedToTrash() }
            }
            Button("キャンセル", role: .cancel) {}
        } message: {
            Text("削除ではなくゴミ箱への移動です。Finder のゴミ箱からいつでも元に戻せます。")
        }
        .alert(
            "エラー",
            isPresented: Binding(
                get: { model.errorMessage != nil },
                set: { if !$0 { model.errorMessage = nil } }
            )
        ) {
            Button("OK") { model.errorMessage = nil }
        } message: {
            Text(model.errorMessage ?? "")
        }
    }

    @ViewBuilder
    private var placeholder: some View {
        if model.folder == nil {
            ContentUnavailableView {
                Label("フォルダを選んでください", systemImage: "photo.stack")
            } description: {
                Text("選んだフォルダの中から、内容が同じ写真とよく似た写真を探します。")
            } actions: {
                Button("フォルダを選ぶ…") { model.chooseFolder() }
                    .buttonStyle(.borderedProminent)
            }
        } else if model.hasScanned && model.groups.isEmpty {
            ContentUnavailableView {
                Label("似た写真は見つかりませんでした", systemImage: "checkmark.circle")
            } description: {
                Text("判定をゆるくすると、より広く似た写真を拾えます。")
            }
        } else {
            ContentUnavailableView(
                "グループを選択してください",
                systemImage: "square.grid.2x2"
            )
        }
    }
}

struct ScanToolbar: ToolbarContent {
    @Bindable var model: ScanViewModel
    @Binding var isConfirmingTrash: Bool

    var body: some ToolbarContent {
        ToolbarItem(placement: .navigation) {
            Button {
                model.chooseFolder()
            } label: {
                Label("フォルダを選ぶ", systemImage: "folder")
            }
            .help(model.folder?.path ?? "調べるフォルダを選びます")
        }

        ToolbarItem {
            Picker("類似度", selection: $model.settings.sensitivity) {
                ForEach(Sensitivity.allCases) { level in
                    Text(level.label).tag(level)
                }
            }
            .pickerStyle(.segmented)
            .frame(width: 220)
            .help(model.settings.sensitivity.help)
            .disabled(model.isScanning)
        }

        ToolbarItem {
            Toggle(isOn: $model.settings.includesSubfolders) {
                Label("サブフォルダも含む", systemImage: "folder.badge.plus")
            }
            .help("サブフォルダの中まで再帰的に調べます")
            .disabled(model.isScanning)
        }

        ToolbarItem {
            Menu {
                ForEach(KeepRule.allCases) { rule in
                    Button(rule.label) { model.applyKeepRule(rule) }
                }
                Divider()
                Button("選択をすべて解除") { model.clearMarks() }
            } label: {
                Label("一括選択", systemImage: "checklist")
            }
            .disabled(model.groups.isEmpty)
        }

        ToolbarItem {
            Button {
                isConfirmingTrash = true
            } label: {
                Label(
                    model.markedCount > 0 ? "\(model.markedCount) 枚をゴミ箱へ" : "ゴミ箱へ",
                    systemImage: "trash"
                )
            }
            .disabled(model.markedCount == 0)
        }

        ToolbarItem {
            Button {
                model.rescan()
            } label: {
                Label("再スキャン", systemImage: "arrow.clockwise")
            }
            .disabled(model.folder == nil || model.isScanning)
        }
    }
}