import AppKit
import SwiftUI

struct BugListPopover: View {
    @State private var bugStore = BugStore.shared
    @State private var tokenManager = TokenManager.shared

    var body: some View {
        VStack(spacing: 0) {
            header
            Divider()

            content

            Divider()
            footer
        }
        .frame(minWidth: 340, idealWidth: 360, maxWidth: 400, minHeight: 280)
    }

    private var header: some View {
        HStack {
            Text("My Bugs")
                .font(.headline)
            Spacer()
            if bugStore.isLoading {
                ProgressView()
                    .scaleEffect(0.7)
                    .frame(width: 16, height: 16)
            }
            if let lastUpdated = bugStore.lastUpdated {
                Text(formatted(lastUpdated))
                    .font(.caption)
                    .foregroundStyle(.secondary)
            }
            Button("Mark all seen") {
                bugStore.markAllSeen()
                AppDelegate.shared?.updateBadge(count: bugStore.activeBugs.count)
            }
            .font(.caption)
        }
        .padding(.horizontal)
        .padding(.vertical, 8)
    }

    @ViewBuilder
    private var content: some View {
        if !tokenManager.isAuthenticated {
            OAuthSetupView()
        } else if let error = bugStore.error {
            ErrorStateView(error: error)
        } else if bugStore.bugsSortedByPriority.isEmpty && !bugStore.isLoading {
            EmptyStateView()
        } else {
            ScrollView {
                LazyVStack(spacing: 0) {
                    ForEach(bugStore.bugsSortedByPriority) { bug in
                        BugRow(
                            bug: bug,
                            isUnseen: bugStore.unseenBugs.contains(bug.id)
                        )
                        .onTapGesture {
                            openInFeishu(bug)
                            bugStore.markSeen(bug.id)
                            AppDelegate.shared?.updateBadge(count: bugStore.activeBugs.count)
                        }
                        Divider().padding(.leading, 44)
                    }
                }
            }
        }
    }

    private var footer: some View {
        HStack {
            Button(action: openFeishuTable) {
                Label("Open in Feishu", systemImage: "arrow.up.forward.app")
            }
            Spacer()
            Button("Refresh") {
                Task { await PollerService.shared.fetchNow() }
            }
            SettingsLink {
                Label("Settings", systemImage: "gear")
            }
        }
        .padding(.horizontal)
        .padding(.vertical, 6)
        .buttonStyle(.plain)
        .font(.caption)
    }

    private func openInFeishu(_ bug: Bug) {
        NSWorkspace.shared.open(bug.feishuURL)
        AppDelegate.shared?.closePopover()
    }

    private func openFeishuTable() {
        guard let config = AppStateService.shared.config else { return }
        let url = FeishuURLBuilder.tableURL(
            baseDomain: config.feishuBaseDomain,
            appToken: config.appToken
        )
        NSWorkspace.shared.open(url)
    }

    private func formatted(_ date: Date) -> String {
        let formatter = RelativeDateTimeFormatter()
        formatter.unitsStyle = .abbreviated
        return formatter.localizedString(for: date, relativeTo: Date())
    }
}

struct EmptyStateView: View {
    var body: some View {
        VStack(spacing: 8) {
            Image(systemName: "checkmark.circle")
                .font(.largeTitle)
                .foregroundStyle(.green)
            Text("No active bugs")
                .font(.headline)
            Text("You're all clear!")
                .font(.subheadline)
                .foregroundStyle(.secondary)
        }
        .frame(maxWidth: .infinity, maxHeight: .infinity)
        .padding()
    }
}

struct ErrorStateView: View {
    let error: Error

    var body: some View {
        VStack(spacing: 8) {
            Image(systemName: "exclamationmark.triangle")
                .font(.largeTitle)
                .foregroundStyle(.orange)
            Text("Failed to load bugs")
                .font(.headline)
            Text(error.localizedDescription)
                .font(.caption)
                .foregroundStyle(.secondary)
                .multilineTextAlignment(.center)
        }
        .frame(maxWidth: .infinity, maxHeight: .infinity)
        .padding()
    }
}