// ── Menu Bar Popover ──────────────────────────────────────────
// Main popover view shown when clicking the menu bar icon

import SwiftUI

struct MenuBarPopover: View {
    @EnvironmentObject var store: MacTimerStore
    @EnvironmentObject var menuBar: MenuBarState

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

            Divider().background(CMColors.border)

            // Quick timer creation
            if menuBar.showQuickTimer {
                quickTimerForm
                Divider().background(CMColors.border)
            }

            // Timer list
            if store.activeTimers.isEmpty && !menuBar.showQuickTimer {
                emptyState
            } else {
                timerList
            }

            Divider().background(CMColors.border)

            // Footer
            footer
        }
        .frame(width: 320)
        .background(CMColors.bg)
    }

    // MARK: - Header

    private var header: some View {
        HStack {
            Text("ChronoMind")
                .font(CMFonts.display(size: 14))
                .foregroundStyle(CMColors.text)

            Spacer()

            Button {
                menuBar.showQuickTimer.toggle()
            } label: {
                Image(systemName: menuBar.showQuickTimer ? "xmark" : "plus")
                    .font(.body.weight(.semibold))
                    .foregroundStyle(CMColors.accent)
            }
            .buttonStyle(.plain)
            .keyboardShortcut("t", modifiers: [.command, .shift])
        }
        .padding(.horizontal, 12)
        .padding(.vertical, 10)
    }

    // MARK: - Quick Timer Form

    private var quickTimerForm: some View {
        VStack(spacing: 8) {
            TextField("Timer label", text: $menuBar.quickTimerLabel)
                .textFieldStyle(.plain)
                .font(CMFonts.body(size: 14))
                .foregroundStyle(CMColors.text)
                .padding(8)
                .background(CMColors.surface)
                .clipShape(RoundedRectangle(cornerRadius: 6))

            HStack {
                Text("\(Int(menuBar.quickTimerMinutes))m")
                    .font(CMFonts.mono(size: 13, weight: .semibold))
                    .foregroundStyle(CMColors.accent)
                    .frame(width: 40)

                Slider(value: $menuBar.quickTimerMinutes, in: 1...120, step: 1)
                    .tint(CMColors.accent)
            }

            HStack(spacing: 8) {
                // Preset buttons
                ForEach([5, 15, 25, 60], id: \.self) { minutes in
                    Button("\(minutes)m") {
                        menuBar.quickTimerMinutes = Double(minutes)
                    }
                    .font(CMFonts.body(size: 11, weight: .medium))
                    .foregroundStyle(menuBar.quickTimerMinutes == Double(minutes) ? .white : CMColors.textSecondary)
                    .padding(.horizontal, 8)
                    .padding(.vertical, 4)
                    .background(menuBar.quickTimerMinutes == Double(minutes) ? CMColors.accent : CMColors.surfaceHover)
                    .clipShape(Capsule())
                    .buttonStyle(.plain)
                }

                Spacer()

                Button("Start") {
                    let label = menuBar.quickTimerLabel.isEmpty ? "Timer" : menuBar.quickTimerLabel
                    store.addCountdown(
                        label: label,
                        durationSeconds: menuBar.quickTimerMinutes * 60
                    )
                    menuBar.resetQuickTimer()
                }
                .font(CMFonts.body(size: 13, weight: .semibold))
                .foregroundStyle(.white)
                .padding(.horizontal, 16)
                .padding(.vertical, 6)
                .background(CMColors.accent)
                .clipShape(Capsule())
                .buttonStyle(.plain)
            }
        }
        .padding(12)
    }

    // MARK: - Timer List

    private var timerList: some View {
        ScrollView {
            LazyVStack(spacing: 1) {
                ForEach(store.activeTimers.sorted(by: { $0.targetTime < $1.targetTime })) { timer in
                    MacTimerRow(timer: timer, now: store.now)
                }
            }
        }
        .frame(maxHeight: 300)
    }

    // MARK: - Empty State

    private var emptyState: some View {
        VStack(spacing: 8) {
            Image(systemName: "clock")
                .font(.system(size: 28))
                .foregroundStyle(CMColors.textMuted)
            Text("No active timers")
                .font(CMFonts.body(size: 13))
                .foregroundStyle(CMColors.textMuted)
            Text("Press ⌘⇧T to create one")
                .font(CMFonts.body(size: 11))
                .foregroundStyle(CMColors.textMuted.opacity(0.7))
        }
        .frame(maxWidth: .infinity)
        .padding(.vertical, 24)
    }

    // MARK: - Footer

    private var footer: some View {
        HStack {
            Text("\(store.activeTimers.count) active")
                .font(CMFonts.body(size: 11))
                .foregroundStyle(CMColors.textMuted)

            Spacer()

            if #available(macOS 14.0, *) {
                SettingsLink {
                    Text("Settings")
                        .font(CMFonts.body(size: 11))
                        .foregroundStyle(CMColors.textSecondary)
                }
                .buttonStyle(.plain)
            }

            Button("Quit") {
                NSApplication.shared.terminate(nil)
            }
            .font(CMFonts.body(size: 11))
            .foregroundStyle(CMColors.textMuted)
            .buttonStyle(.plain)
            .keyboardShortcut("q")
        }
        .padding(.horizontal, 12)
        .padding(.vertical, 8)
    }
}

// MARK: - Mac Timer Row

struct MacTimerRow: View {
    let timer: CMTimer
    let now: Date

    @EnvironmentObject var store: MacTimerStore

    var body: some View {
        HStack(spacing: 8) {
            // Urgency dot
            Circle()
                .fill(CMColors.urgencyColor(timer.urgency))
                .frame(width: 6, height: 6)

            // Label
            VStack(alignment: .leading, spacing: 2) {
                Text(timer.label)
                    .font(CMFonts.body(size: 13, weight: .medium))
                    .foregroundStyle(CMColors.text)
                    .lineLimit(1)

                Text(formatTime(timer.targetTime))
                    .font(CMFonts.body(size: 11))
                    .foregroundStyle(CMColors.textMuted)
            }

            Spacer()

            // Countdown
            let remaining = getRemainingSeconds(timer, now: now)
            Text(formatDuration(remaining))
                .font(CMFonts.mono(size: 13, weight: .semibold))
                .foregroundStyle(stateColor)

            // Actions
            if timer.state == .firing {
                Button {
                    store.snooze(timer.id, minutes: 5)
                } label: {
                    Image(systemName: "moon.zzz")
                        .font(.caption)
                        .foregroundStyle(CMColors.textMuted)
                }
                .buttonStyle(.plain)

                Button {
                    store.dismiss(timer.id)
                } label: {
                    Image(systemName: "xmark.circle.fill")
                        .font(.caption)
                        .foregroundStyle(CMColors.error)
                }
                .buttonStyle(.plain)
            } else {
                Button {
                    store.removeTimer(timer.id)
                } label: {
                    Image(systemName: "xmark")
                        .font(.caption2.weight(.bold))
                        .foregroundStyle(CMColors.textMuted.opacity(0.5))
                }
                .buttonStyle(.plain)
            }
        }
        .padding(.horizontal, 12)
        .padding(.vertical, 8)
        .background(timer.state == .firing ? CMColors.urgencyBg(timer.urgency) : Color.clear)
        .contentShape(Rectangle())
    }

    private var stateColor: Color {
        switch timer.state {
        case .firing: return CMColors.urgencyColor(timer.urgency)
        case .warning: return CMColors.important
        case .paused: return CMColors.textMuted
        default: return CMColors.accent
        }
    }
}