using SkiaSharp;

namespace HC_APTBS.Services.Impl
{
    /// <summary>
    /// Centralised visual constants for the PDF test report.
    /// All colours, font sizes, spacing, and chart dimensions live here
    /// so the report look-and-feel can be adjusted in one place.
    /// </summary>
    internal static class ReportTheme
    {
        // ── Colour palette (hex strings for QuestPDF, SKColor for charts) ─────

        /// <summary>Dark navy for section header bars.</summary>
        public const string HeaderNavy = "#1B2A4A";

        /// <summary>Secondary grey for sub-headers and muted text.</summary>
        public const string HeaderGrey = "#4A4A4A";

        /// <summary>Accent blue for highlights.</summary>
        public const string AccentBlue = "#2E5090";

        /// <summary>Pass result — dark green text.</summary>
        public const string PassGreen = "#2E7D32";

        /// <summary>Pass result — light green background.</summary>
        public const string PassGreenLight = "#E8F5E9";

        /// <summary>Fail result — dark red text.</summary>
        public const string FailRed = "#C62828";

        /// <summary>Fail result — light red background.</summary>
        public const string FailRedLight = "#FFEBEE";

        /// <summary>Alternating table row stripe.</summary>
        public const string TableAltRow = "#F5F7FA";

        /// <summary>Thin divider lines.</summary>
        public const string DividerLine = "#BDBDBD";

        /// <summary>Error/warning row background.</summary>
        public const string WarningBg = "#FFF3E0";

        /// <summary>Error/warning text.</summary>
        public const string WarningText = "#E65100";

        // ── Chart-specific SKColors ───────────────────────────────────────────

        /// <summary>Semi-transparent blue tolerance band.</summary>
        public static readonly SKColor ToleranceBand = new(46, 80, 144, 50);

        /// <summary>Amber dashed target line.</summary>
        public static readonly SKColor TargetLine = new(255, 111, 0);

        /// <summary>Blue data polyline.</summary>
        public static readonly SKColor SampleLine = new(21, 101, 192);

        /// <summary>Light grey chart gridlines and border.</summary>
        public static readonly SKColor ChartGrid = new(224, 224, 224);

        /// <summary>Chart background.</summary>
        public static readonly SKColor ChartBackground = SKColors.White;

        /// <summary>Green average line (pass).</summary>
        public static readonly SKColor AvgPassLine = new(46, 125, 50);

        /// <summary>Red average line (fail).</summary>
        public static readonly SKColor AvgFailLine = new(198, 40, 40);

        /// <summary>Chart axis label colour.</summary>
        public static readonly SKColor AxisLabel = new(97, 97, 97);

        // ── Font sizes (points) ───────────────────────────────────────────────

        /// <summary>Report title.</summary>
        public const float TitleSize = 16f;

        /// <summary>Section header text (e.g. "PUMP IDENTIFICATION").</summary>
        public const float SectionHeaderSize = 11f;

        /// <summary>Body / table cell text.</summary>
        public const float BodySize = 9f;

        /// <summary>Small captions and chart labels.</summary>
        public const float CaptionSize = 7f;

        /// <summary>Footer text.</summary>
        public const float FooterSize = 7f;

        // ── Spacing (points) ─────────────────────────────────────────────────

        /// <summary>Gap between major sections.</summary>
        public const float SectionGap = 10f;

        /// <summary>Gap between sub-sections (e.g. chart caption).</summary>
        public const float SubsectionGap = 6f;

        /// <summary>Table cell padding.</summary>
        public const float CellPad = 3f;

        // ── Chart dimensions (points) ─────────────────────────────────────────

        /// <summary>Chart render height inside the PDF.</summary>
        public const float ChartHeight = 160f;
    }
}