//
//  ContentView.swift
//  MyPass
//
//  Created by Christophe Vila on 21/05/2026.
//

import SwiftUI
import MyPassCore
#if os(macOS)
import AppKit
#endif

struct ContentView: View {
    @StateObject private var session = VaultSession()

    var body: some View {
        SwiftUI.Group {
            if session.isLocked {
                UnlockView(vm: UnlockViewModel(session: session))
            } else {
                vaultView
            }
        }
        .onReceive(
            NotificationCenter.default.publisher(for: sceneBackgroundNotification)
        ) { _ in
            session.lock()
        }
    }

    @ViewBuilder
    private var vaultView: some View {
        let vaultVM = VaultViewModel(session: session)
        #if os(macOS)
        MacVaultView(vm: vaultVM)
        #else
        NavigationStack {
            if let root = session.database?.root {
                GroupBrowserView(vm: vaultVM, group: root)
            }
        }
        #endif
    }

    private var sceneBackgroundNotification: Notification.Name {
        #if os(iOS)
        UIScene.didEnterBackgroundNotification
        #else
        NSApplication.didResignActiveNotification
        #endif
    }
}

// MARK: - macOS 3-column layout

#if os(macOS)
private struct MacVaultView: View {
    @ObservedObject var vm: VaultViewModel
    @State private var selectedGroup: MyPassCore.Group?
    @State private var selectedEntry: Entry?
    @State private var showAddEntry = false

    private var activeGroup: MyPassCore.Group? { selectedGroup ?? vm.session.database?.root }

    var body: some View {
        NavigationSplitView {
            GroupSidebarView(vm: vm, selectedGroup: $selectedGroup)
        } content: {
            if vm.isSearching {
                SearchView(vm: vm, selectedEntry: $selectedEntry)
            } else if let group = activeGroup {
                entryList(for: group)
            } else {
                Text("Select a group").foregroundStyle(.secondary)
            }
        } detail: {
            if let entry = selectedEntry {
                EntryDetailView(entry: entry, session: vm.session)
            } else {
                Text("Select an entry").foregroundStyle(.secondary)
            }
        }
        .searchable(text: $vm.searchQuery, prompt: "Search all entries…")
        .sheet(isPresented: $showAddEntry) {
            if let group = activeGroup {
                EntryEditView(vm: EntryEditViewModel(session: vm.session, groupId: group.id))
            }
        }
    }

    private func entryList(for group: MyPassCore.Group) -> some View {
        List(group.entries, selection: $selectedEntry) { entry in
            EntryListRow(entry: entry).tag(entry)
        }
        .navigationTitle(group.name)
        .toolbar {
            ToolbarItem {
                Button { showAddEntry = true } label: { Image(systemName: "plus") }
            }
        }
    }
}

private struct GroupSidebarView: View {
    @ObservedObject var vm: VaultViewModel
    @Binding var selectedGroup: MyPassCore.Group?

    var body: some View {
        List(selection: $selectedGroup) {
            if let root = vm.session.database?.root {
                GroupNode(group: root)
            }
        }
        .navigationTitle("Groups")
    }
}

private struct GroupNode: View {
    let group: MyPassCore.Group
    var body: some View {
        if group.subgroups.isEmpty {
            Label(group.name, systemImage: "folder").tag(group)
        } else {
            DisclosureGroup {
                ForEach(group.subgroups) { sub in GroupNode(group: sub) }
            } label: {
                Label(group.name, systemImage: "folder").tag(group)
            }
        }
    }
}
#endif