using System;
using System.Collections.ObjectModel;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using HC_APTBS.Models;
using HC_APTBS.Services;

namespace HC_APTBS.ViewModels
{
    /// <summary>
    /// Represents a single phase card within a test section.
    /// Displays the phase name, enable/disable toggle, operation values,
    /// and graphic result indicators.
    /// </summary>
    public sealed partial class PhaseCardViewModel : ObservableObject
    {
        private readonly ILocalizationService _loc;

        /// <summary>Initialises a new phase card with a localization service.</summary>
        public PhaseCardViewModel(ILocalizationService loc) => _loc = loc;
        // ── Identity ──────────────────────────────────────────────────────────────

        /// <summary>Display name of the phase (e.g. "1 - S_001").</summary>
        [ObservableProperty] private string _name = string.Empty;

        /// <summary>True when failure in this phase halts the entire test sequence.</summary>
        [ObservableProperty] private bool _isCritical;

        // ── Enable/disable ────────────────────────────────────────────────────────

        /// <summary>
        /// Whether this phase is included in the test run.
        /// Writing this property also updates the underlying <see cref="PhaseDefinition.Enabled"/>
        /// and notifies the parent <see cref="TestSectionViewModel"/> to recalculate its
        /// <c>AllPhasesChecked</c> state.
        /// </summary>
        [ObservableProperty] private bool _isEnabled = true;

        // ── Execution state ───────────────────────────────────────────────────────

        /// <summary>True while this phase is actively executing.</summary>
        [ObservableProperty] private bool _isActive;

        /// <summary>True when the phase completed and passed all criteria.</summary>
        [ObservableProperty] private bool _isPassed;

        /// <summary>True when the phase completed but failed one or more criteria.</summary>
        [ObservableProperty] private bool _isFailed;

        /// <summary>Short result label shown in the card (e.g. "PASS", "FAIL", "-").</summary>
        [ObservableProperty] private string _resultText = string.Empty;

        // ── Operation values visibility ───────────────────────────────────────────

        /// <summary>
        /// Controls visibility of the operation values section (RPM, ME, FBKW).
        /// Bound from <see cref="TestPanelViewModel.ShowOperationValues"/>.
        /// </summary>
        [ObservableProperty] private bool _showOperationValues;

        // ── Collections ───────────────────────────────────────────────────────────

        /// <summary>Send parameters displayed in the card (RPM, ME, FBKW, etc.).</summary>
        public ObservableCollection<OperationValueViewModel> OperationValues { get; } = new();

        /// <summary>Readiness conditions displayed in the card (temperature, etc.).</summary>
        public ObservableCollection<OperationValueViewModel> ReadyValues { get; } = new();

        /// <summary>Graphic result indicators, one per receive parameter.</summary>
        public ObservableCollection<GraphicIndicatorViewModel> ResultIndicators { get; } = new();

        // ── Back-references ───────────────────────────────────────────────────────

        /// <summary>Back-reference to the model for writing enabled state changes.</summary>
        internal PhaseDefinition? Source { get; set; }

        /// <summary>
        /// Callback invoked when <see cref="IsEnabled"/> changes, so the parent
        /// <see cref="TestSectionViewModel"/> can recalculate <c>AllPhasesChecked</c>.
        /// </summary>
        internal Action<PhaseCardViewModel>? EnabledChanged { get; set; }

        // ── Change handlers ───────────────────────────────────────────────────────

        partial void OnIsEnabledChanged(bool value)
        {
            // Write back to the model.
            if (Source != null)
                Source.Enabled = value;

            ResultText = value ? "\u2013" : _loc.GetString("Common.Disabled");

            // Notify parent.
            EnabledChanged?.Invoke(this);
        }

        // ── Commands ──────────────────────────────────────────────────────────────

        /// <summary>Inverts <see cref="IsEnabled"/>. Bound to the card's click gesture.</summary>
        [RelayCommand]
        private void ToggleEnabled() => IsEnabled = !IsEnabled;

        // ── Public API ────────────────────────────────────────────────────────────

        /// <summary>Resets execution state for a new test run.</summary>
        public void Reset()
        {
            IsActive   = false;
            IsPassed   = false;
            IsFailed   = false;
            ResultText = IsEnabled ? "\u2013" : _loc.GetString("Common.Disabled");

            foreach (var indicator in ResultIndicators)
                indicator.Reset();
        }
    }
}