import SwiftUI

struct IOSDashboardView: View {
    @EnvironmentObject private var appState: AppState

    private var failedProjects: [ProjectSnapshot] {
        appState.projects.filter { $0.qualityGate.uppercased() != "OK" }
    }

    private var bugs: Int { total("bugs") }
    private var vulnerabilities: Int { total("vulnerabilities") }
    private var codeSmells: Int { total("code_smells") }

    var body: some View {
        NavigationStack {
            ScrollView {
                LazyVGrid(columns: [GridItem(.adaptive(minimum: 155), spacing: 12)], spacing: 12) {
                    metricCard("Projects", value: appState.projects.count, icon: "square.stack.3d.up")
                    metricCard("Failed", value: failedProjects.count, icon: "xmark.octagon.fill", isFailure: !failedProjects.isEmpty)
                    metricCard("Bugs", value: bugs, icon: "ladybug")
                    metricCard("Vulnerabilities", value: vulnerabilities, icon: "lock.trianglebadge.exclamationmark")
                    metricCard("Code Smells", value: codeSmells, icon: "exclamationmark.bubble")
                }
                .padding()

                if !failedProjects.isEmpty {
                    VStack(alignment: .leading, spacing: 10) {
                        Text("Needs attention")
                            .font(.headline)
                        ForEach(failedProjects) { snapshot in
                            NavigationLink {
                                IOSProjectDetailView(snapshot: snapshot)
                            } label: {
                                HStack {
                                    Image(systemName: "xmark.octagon.fill")
                                        .foregroundStyle(.red)
                                    VStack(alignment: .leading) {
                                        Text(snapshot.project.name).fontWeight(.semibold)
                                        Text(snapshot.qualityGate).font(.caption)
                                    }
                                    Spacer()
                                    Image(systemName: "chevron.right")
                                        .foregroundStyle(.secondary)
                                }
                                .padding()
                                .background(.red.opacity(0.10), in: RoundedRectangle(cornerRadius: 14))
                            }
                            .buttonStyle(.plain)
                        }
                    }
                    .padding(.horizontal)
                }
            }
            .navigationTitle("Dashboard")
            .toolbar {
                ToolbarItem(placement: .topBarTrailing) {
                    Button { Task { await appState.refresh() } } label: {
                        if appState.isLoading { ProgressView() } else { Image(systemName: "arrow.clockwise") }
                    }
                    .disabled(appState.isLoading || appState.selectedServer == nil)
                }
            }
            .overlay {
                if appState.selectedServer == nil {
                    ContentUnavailableView("No SonarQube Server", systemImage: "server.rack", description: Text("Add or sync a server to start using SonarDesk."))
                }
            }
        }
    }

    private func total(_ key: String) -> Int {
        appState.projects.reduce(0) { $0 + (Int($1.measures[key] ?? "0") ?? 0) }
    }

    @ViewBuilder
    private func metricCard(_ title: String, value: Int, icon: String, isFailure: Bool = false) -> some View {
        VStack(alignment: .leading, spacing: 12) {
            Image(systemName: icon).font(.title2).foregroundStyle(isFailure ? .red : .primary)
            Text("\(value)").font(.system(.title, design: .rounded, weight: .bold))
            Text(title).font(.subheadline).foregroundStyle(.secondary)
        }
        .frame(maxWidth: .infinity, alignment: .leading)
        .padding()
        .background(isFailure ? .red.opacity(0.10) : Color.secondary.opacity(0.08), in: RoundedRectangle(cornerRadius: 16))
    }
}