//
// RoutineListView.swift
// Workouts
//
// Created by rzen on 7/25/25 at 6:24 PM.
//
// Copyright 2025 Rouslan Zenetl. All Rights Reserved.
//

import SwiftUI
import SwiftData

/// The Routines library screen, pushed from Settings → Library: a plain list of
/// routines, one row each. Tapping a row opens `RoutineDetailView`; long-pressing
/// offers Delete (the sole routine-delete affordance); the toolbar's + adds a new
/// routine. Starter routines are seeded automatically on the true first run
/// (`SyncEngine.autoSeedIfEmpty`), so an empty library just invites creating one.
struct RoutineListView: View {
    @Environment(SyncEngine.self) private var sync

    @Query(sort: \Routine.name) private var routines: [Routine]

    @State private var showingAddSheet = false
    @State private var routineToDelete: Routine?

    var body: some View {
        List {
            ForEach(routines) { routine in
                NavigationLink {
                    RoutineDetailView(routine: routine)
                } label: {
                    RoutineRow(routine: routine)
                }
                .contextMenu {
                    Button(role: .destructive) {
                        routineToDelete = routine
                    } label: {
                        Label("Delete", systemImage: "trash")
                    }
                }
            }
        }
        .listStyle(.insetGrouped)
        .overlay {
            if routines.isEmpty {
                ContentUnavailableView(
                    "No Routines Yet",
                    systemImage: "dumbbell.fill",
                    description: Text("Create a routine to organize your workout routine.")
                )
            }
        }
        .navigationTitle("Routines")
        .toolbar {
            ToolbarItem(placement: .navigationBarTrailing) {
                Button {
                    showingAddSheet = true
                } label: {
                    Image(systemName: "plus")
                }
                .accessibilityLabel("Add Routine")
            }
        }
        .sheet(isPresented: $showingAddSheet) {
            RoutineAddEditView(routine: nil)
        }
        .confirmationDialog(
            "Delete Routine?",
            isPresented: Binding(
                get: { routineToDelete != nil },
                set: { if !$0 { routineToDelete = nil } }
            ),
            titleVisibility: .visible,
            presenting: routineToDelete
        ) { routine in
            Button("Delete", role: .destructive) {
                Task { await sync.delete(routine: routine) }
                routineToDelete = nil
            }
            Button("Cancel", role: .cancel) {
                routineToDelete = nil
            }
        } message: { routine in
            Text("This will permanently delete \"\(routine.name)\" and all its exercises. Past workouts are kept.")
        }
    }
}

/// A single routine row: a small rounded-square badge (the routine's color at low
/// opacity, its symbol tinted full-strength) beside the routine name and its
/// exercise count.
private struct RoutineRow: View {
    var routine: Routine

    var body: some View {
        HStack(spacing: 12) {
            Image(systemName: routine.systemImage)
                .font(.title3)
                .foregroundStyle(routineColor)
                .frame(width: 36, height: 36)
                .background(routineColor.opacity(0.12), in: RoundedRectangle(cornerRadius: 8))

            VStack(alignment: .leading, spacing: 2) {
                Text(routine.name)
                    .foregroundStyle(.primary)

                Text("\(routine.exercisesArray.count) exercises")
                    .font(.caption)
                    .foregroundStyle(.secondary)
            }
        }
        .padding(.vertical, 2)
    }

    private var routineColor: Color {
        Color.color(from: routine.color)
    }
}