//
//  SidebarView.swift
//  MUA
//
//  Created by Mitchel Volkering on 21/12/2025.
//

import SwiftUI

enum NavigationItem: String, Identifiable, CaseIterable {
    case spaceLens = "Space Lens"
    case disks = "Disks"
    case largeFiles = "Large Files"
    case cleanup = "Cleanup"

    var id: String { rawValue }

    var icon: String {
        switch self {
        case .spaceLens: return "circle.hexagongrid.fill"
        case .disks: return "internaldrive.fill"
        case .largeFiles: return "doc.badge.arrow.up.fill"
        case .cleanup: return "trash.fill"
        }
    }

    var description: String {
        switch self {
        case .spaceLens: return "Visualize disk usage"
        case .disks: return "View connected drives"
        case .largeFiles: return "Find space hogs"
        case .cleanup: return "Clean unnecessary files"
        }
    }
}

struct SidebarView: View {
    @Binding var selectedItem: NavigationItem
    let disks: [DiskInfo]

    var body: some View {
        List(selection: $selectedItem) {
            Section("Analyze") {
                ForEach([NavigationItem.spaceLens, .largeFiles]) { item in
                    NavigationLink(value: item) {
                        Label(item.rawValue, systemImage: item.icon)
                    }
                }
            }

            Section("Storage") {
                ForEach([NavigationItem.disks]) { item in
                    NavigationLink(value: item) {
                        Label(item.rawValue, systemImage: item.icon)
                    }
                }

                // Quick disk overview
                ForEach(disks) { disk in
                    DiskQuickView(disk: disk)
                }
            }

            Section("Maintain") {
                ForEach([NavigationItem.cleanup]) { item in
                    NavigationLink(value: item) {
                        Label(item.rawValue, systemImage: item.icon)
                    }
                }
            }
        }
        .listStyle(.sidebar)
        .frame(minWidth: 200)
    }
}

struct DiskQuickView: View {
    let disk: DiskInfo

    var body: some View {
        VStack(alignment: .leading, spacing: 6) {
            HStack {
                Image(systemName: disk.icon)
                    .foregroundStyle(.secondary)
                Text(disk.name)
                    .font(.subheadline)
            }

            // Usage bar
            GeometryReader { geo in
                ZStack(alignment: .leading) {
                    // Background
                    RoundedRectangle(cornerRadius: 3)
                        .fill(.quaternary)

                    // Used space
                    RoundedRectangle(cornerRadius: 3)
                        .fill(usageColor)
                        .frame(width: geo.size.width * CGFloat(disk.usedPercentage / 100))
                }
            }
            .frame(height: 6)

            HStack {
                Text("\(disk.formattedFreeSpace) free")
                    .font(.caption)
                    .foregroundStyle(.secondary)
                Spacer()
                Text("of \(disk.formattedTotalSpace)")
                    .font(.caption)
                    .foregroundStyle(.tertiary)
            }
        }
        .padding(.vertical, 4)
    }

    private var usageColor: Color {
        let percentage = disk.usedPercentage
        if percentage > 90 { return .red }
        if percentage > 75 { return .orange }
        return .accentColor
    }
}

#Preview {
    SidebarView(
        selectedItem: .constant(.spaceLens),
        disks: [
            DiskInfo(
                name: "Macintosh HD",
                mountPoint: URL(fileURLWithPath: "/"),
                totalSpace: 500_000_000_000,
                freeSpace: 120_000_000_000,
                isRemovable: false,
                isInternal: true
            )
        ]
    )
    .frame(width: 250, height: 400)
}