using System;
using System.Collections.Generic;
using System.Linq;

namespace HC_APTBS.Models
{
    /// <summary>
    /// Immutable snapshot of a completed test session captured at the moment
    /// <see cref="Services.IBenchService.TestFinished"/> fires. Lives only for the
    /// lifetime of the current app session — there is no cross-session storage.
    ///
    /// <para>The <see cref="PumpSnapshot"/> is a deep copy of the pump's metadata and
    /// <see cref="TestDefinition"/> list (including per-parameter results) so that
    /// re-running a test on the same pump does not mutate prior history entries.
    /// It can be handed directly to <see cref="Services.IPdfService.GenerateReport"/>
    /// to reproduce the exact PDF for this run.</para>
    /// </summary>
    public sealed class CompletedTestRun
    {
        /// <summary>Unique identifier for the run — used as the key for per-entry delete.</summary>
        public Guid Id { get; init; } = Guid.NewGuid();

        /// <summary>Wall-clock time the <c>TestFinished</c> event fired.</summary>
        public DateTime CompletedAt { get; init; }

        /// <summary>Pump model string copied from the source pump at capture time.</summary>
        public string PumpModel { get; init; } = string.Empty;

        /// <summary>Pump serial number copied from the source pump at capture time.</summary>
        public string PumpSerial { get; init; } = string.Empty;

        /// <summary>True when every evaluated parameter in every enabled phase passed.</summary>
        public bool OverallPassed { get; init; }

        /// <summary>True when the run ended via abort / stop instead of normal completion.</summary>
        public bool Interrupted { get; init; }

        /// <summary>
        /// Deep-cloned pump containing metadata + deep-cloned <see cref="TestDefinition"/>
        /// list with results. Safe to hand directly to <see cref="Services.IPdfService"/>.
        /// </summary>
        public PumpDefinition PumpSnapshot { get; init; } = null!;

        /// <summary>
        /// Operator observations edited on the Results page. Mutable after capture,
        /// persisted back from the <see cref="ViewModels.Dialogs.ReportViewModel"/>
        /// when the operator exports a PDF.
        /// </summary>
        public string Observations { get; set; } = string.Empty;

        /// <summary>
        /// Space-separated list of test names in the snapshot (e.g. "WL · UP · PFP"),
        /// shown as a secondary label in the history list.
        /// </summary>
        public string TestNames =>
            PumpSnapshot?.Tests != null && PumpSnapshot.Tests.Count > 0
                ? string.Join(" \u00B7 ", PumpSnapshot.Tests.Select(t => t.Name))
                : string.Empty;
    }
}