using PlotLine.Models;

namespace PlotLine.ViewModels;

public sealed class StoryIntelligenceGlobalProgressViewModel
{
    public IReadOnlyList<StoryIntelligenceGlobalProgressBookViewModel> Books { get; init; } = [];
    public bool HasActiveWork => Books.Any(book => book.HasActiveRuns);
    public int ActiveBookCount => Books.Count(book => book.HasActiveRuns);
    public int ActiveRunCount => Books.Sum(book => book.PendingRunCount + book.RunningRunCount);
    public int TotalExpectedScenes => Books.Sum(book => book.TotalExpectedScenes);
    public int TotalDetectedScenes => TotalExpectedScenes;
    public int CompletedScenes => Books.Sum(book => book.CompletedScenes);
    public int FailedScenes => Books.Sum(book => book.FailedScenes);
    public int ActiveScenes => Books.Sum(book => book.ActiveScenes);
    public int ProgressPercent => TotalExpectedScenes <= 0
        ? 0
        : Math.Clamp(Convert.ToInt32(Math.Round(CompletedScenes * 100m / TotalExpectedScenes)), 0, 100);
    public string Status => Books.Any(book => book.Status == "Finalising")
        ? "Finalising"
        : Books.Any(book => book.HasFailures)
            ? StoryIntelligenceRunStatuses.CompletedWithWarnings
            : Books.Any(book => book.HasActiveRuns)
                ? StoryIntelligenceRunStatuses.Running
                : StoryIntelligenceRunStatuses.Completed;
    public string SummaryText => ActiveBookCount switch
    {
        0 => string.Empty,
        1 => Books.First(book => book.HasActiveRuns).SummaryText,
        _ => $"{ActiveBookCount:N0} books analysing"
    };
}

public sealed class StoryIntelligenceGlobalProgressBookViewModel
{
    public int? ProjectID { get; init; }
    public int? BookID { get; init; }
    public string BookTitle { get; init; } = "Book";
    public int RunCount { get; init; }
    public int PendingRunCount { get; init; }
    public int RunningRunCount { get; init; }
    public int CompletedRunCount { get; init; }
    public int FailedRunCount { get; init; }
    public int TotalExpectedScenes { get; init; }
    public int TotalDetectedScenes => TotalExpectedScenes;
    public int CompletedScenes { get; init; }
    public int FailedScenes { get; init; }
    public int ActiveScenes { get; init; }
    public string Status { get; init; } = StoryIntelligenceRunStatuses.Pending;
    public long TotalDurationMs { get; init; }
    public DateTime UpdatedUtc { get; init; }

    public bool HasActiveRuns => PendingRunCount > 0 || RunningRunCount > 0;
    public bool HasFailures => FailedRunCount > 0 || FailedScenes > 0;
    public int ProgressPercent => TotalExpectedScenes <= 0
        ? 0
        : Math.Clamp(Convert.ToInt32(Math.Round(CompletedScenes * 100m / TotalExpectedScenes)), 0, 100);
    public string SummaryText => $"{BookTitle}: {CompletedScenes:N0}/{Math.Max(TotalExpectedScenes, CompletedScenes):N0} scenes";
    public string EstimatedRemaining => Status == "Finalising"
        ? "Finalising"
        : EstimateRemaining(TotalDurationMs, CompletedScenes, FailedScenes, TotalExpectedScenes);

    private static string EstimateRemaining(long elapsedMs, int completedScenes, int failedScenes, int totalScenes)
    {
        if (totalScenes <= 0 || completedScenes <= 0)
        {
            return "Calculating";
        }

        var remainingScenes = Math.Max(0, totalScenes - completedScenes - failedScenes);
        if (remainingScenes == 0)
        {
            return "Finalising";
        }

        var averageSceneMs = elapsedMs / Math.Max(1, completedScenes);
        var remaining = TimeSpan.FromMilliseconds(averageSceneMs * remainingScenes);
        if (remaining.TotalMinutes >= 1)
        {
            return $"{Math.Max(1, (int)Math.Round(remaining.TotalMinutes)):N0} min";
        }

        return $"{Math.Max(1, (int)Math.Round(remaining.TotalSeconds)):N0} sec";
    }
}