namespace AxCopilot.Models;

/// <summary>
/// Period filter for the Code tab usage dashboard.
/// Mirrors the "All / 30d / 7d" controls shown in the reference stats view.
/// </summary>
public enum CodeStatsPeriod
{
    /// <summary>Aggregate over every record on disk.</summary>
    All = 0,
    /// <summary>Aggregate over the last 30 days.</summary>
    Last30Days = 30,
    /// <summary>Aggregate over the last 7 days.</summary>
    Last7Days = 7,
}

/// <summary>
/// One day in the activity heatmap.
/// IntensityLevel is 0..4 where 0 means "no activity".
/// </summary>
public sealed record CodeStatsHeatmapCell(DateTime Date, long Tokens, int IntensityLevel);

/// <summary>One model bucket within a single day of the model chart.</summary>
public sealed record CodeStatsModelDailyTokens(string Model, long Tokens);

/// <summary>One day in the stacked model chart.</summary>
public sealed record CodeStatsDailyModelStack(DateTime Date, IReadOnlyList<CodeStatsModelDailyTokens> Models);

/// <summary>
/// Per-model aggregate row shown beneath the model stacked bar chart.
/// SharePercent is 0..100.
/// </summary>
public sealed record CodeStatsModelTotal(
    string Model,
    long InTokens,
    long OutTokens,
    double SharePercent);

/// <summary>
/// Summary model used by the Code tab usage dashboard.
/// </summary>
public sealed record CodeStatsSummary
{
    public int SessionsCount { get; init; }
    public int MessagesCount { get; init; }
    public long TotalTokens { get; init; }
    public int ActiveDays { get; init; }
    public int CurrentStreak { get; init; }
    public int LongestStreak { get; init; }
    public int? MostActiveHour { get; init; }
    public string? FavoriteModel { get; init; }
    public IReadOnlyList<CodeStatsHeatmapCell> Heatmap { get; init; } = Array.Empty<CodeStatsHeatmapCell>();
    public IReadOnlyList<CodeStatsDailyModelStack> ModelStack { get; init; } = Array.Empty<CodeStatsDailyModelStack>();
    public IReadOnlyList<CodeStatsModelTotal> ModelTotals { get; init; } = Array.Empty<CodeStatsModelTotal>();
    public CodeStatsPeriod Period { get; init; }
    public DateTime ComputedAtUtc { get; init; }

    public static CodeStatsSummary Empty(CodeStatsPeriod period) => new()
    {
        Period = period,
        ComputedAtUtc = DateTime.UtcNow,
    };
}