// ── Watch Content View ────────────────────────────────────────
// Main navigation for watchOS — timeline + quick timer

import SwiftUI

struct WatchContentView: View {
    @EnvironmentObject var store: WatchTimerStore

    var body: some View {
        NavigationStack {
            if store.timers.isEmpty {
                emptyState
            } else {
                timerList
            }
        }
        .onAppear {
            store.loadFromSharedData()
        }
    }

    // MARK: - Timer List

    private var timerList: some View {
        List {
            // Next up section
            if let next = store.nextFiringTimer {
                Section {
                    NavigationLink {
                        WatchTimerDetailView(timer: next)
                    } label: {
                        WatchNextUpCard(timer: next, now: store.now)
                    }
                    .listRowBackground(urgencyColor(next.urgency).opacity(0.15))
                } header: {
                    Text("NEXT UP")
                        .font(.system(size: 10, weight: .semibold))
                }
            }

            // Quick timer
            Section {
                NavigationLink {
                    WatchQuickTimerView()
                } label: {
                    Label("Quick Timer", systemImage: "plus.circle.fill")
                        .foregroundStyle(.blue)
                }
            }

            // All active timers
            if store.activeTimers.count > 1 {
                Section {
                    ForEach(store.activeTimers.filter { $0.id != store.nextFiringTimer?.id }) { timer in
                        NavigationLink {
                            WatchTimerDetailView(timer: timer)
                        } label: {
                            WatchTimerRow(timer: timer, now: store.now)
                        }
                    }
                } header: {
                    Text("UPCOMING")
                        .font(.system(size: 10, weight: .semibold))
                }
            }
        }
        .navigationTitle("ChronoMind")
    }

    // MARK: - Empty State

    private var emptyState: some View {
        VStack(spacing: 12) {
            Image(systemName: "clock")
                .font(.system(size: 36))
                .foregroundStyle(.secondary)

            Text("No Timers")
                .font(.system(size: 16, weight: .semibold))

            NavigationLink {
                WatchQuickTimerView()
            } label: {
                Label("Create Timer", systemImage: "plus")
            }
            .buttonStyle(.borderedProminent)
            .tint(.blue)
        }
        .navigationTitle("ChronoMind")
    }

    private func urgencyColor(_ urgency: UrgencyLevel) -> Color {
        switch urgency {
        case .critical: return .red
        case .important: return .orange
        case .standard: return .yellow
        case .gentle: return .green
        case .passive: return .blue
        }
    }
}

// MARK: - Next Up Card

struct WatchNextUpCard: View {
    let timer: TimerSnapshot
    let now: Date

    var body: some View {
        VStack(alignment: .leading, spacing: 4) {
            Text(timer.label)
                .font(.system(size: 14, weight: .semibold))
                .lineLimit(1)

            Text(timer.targetTime, style: .timer)
                .font(.system(size: 24, weight: .bold, design: .monospaced))
                .foregroundStyle(urgencyColor(timer.urgency))

            Text(formatTime(timer.targetTime))
                .font(.system(size: 11))
                .foregroundStyle(.secondary)
        }
        .padding(.vertical, 4)
    }

    private func urgencyColor(_ urgency: UrgencyLevel) -> Color {
        switch urgency {
        case .critical: return .red
        case .important: return .orange
        case .standard: return .yellow
        case .gentle: return .green
        case .passive: return .blue
        }
    }
}

// MARK: - Timer Row

struct WatchTimerRow: View {
    let timer: TimerSnapshot
    let now: Date

    var body: some View {
        HStack {
            Circle()
                .fill(urgencyColor(timer.urgency))
                .frame(width: 6, height: 6)

            VStack(alignment: .leading, spacing: 2) {
                Text(timer.label)
                    .font(.system(size: 13, weight: .medium))
                    .lineLimit(1)
                Text(formatTime(timer.targetTime))
                    .font(.system(size: 11))
                    .foregroundStyle(.secondary)
            }

            Spacer()

            Text(timer.targetTime, style: .timer)
                .font(.system(size: 13, weight: .semibold, design: .monospaced))
                .foregroundStyle(urgencyColor(timer.urgency))
                .multilineTextAlignment(.trailing)
        }
    }

    private func urgencyColor(_ urgency: UrgencyLevel) -> Color {
        switch urgency {
        case .critical: return .red
        case .important: return .orange
        case .standard: return .yellow
        case .gentle: return .green
        case .passive: return .blue
        }
    }
}