using Avalonia;
using Avalonia.Media;
using System;
using System.Collections.Generic;
using System.Globalization;

namespace YZWater.Avalonia.Controls.Renderers;

/// <summary>
/// 水箱渲染器。
/// <list type="bullet">
/// <item><see cref="Draw"/>：简单矩形水箱（兼容模式）</item>
/// <item><see cref="DrawSection"/>：剖面池（SCADA 拟真）— 池壁质感 + 液位填充 +
/// 正弦波浪动画 + 液位大字 + 左侧刻度尺 + 彩色阈值线（启泵/停泵/保护液位）</item>
/// </list>
/// </summary>
public static class TankRenderer
{
    /// <summary>阈值线定义（液位为与 waterLevel 同单位的原始值）</summary>
    public record ThresholdLine(double Level, Color Color, string Label);

    /// <summary>
    /// 绘制一个简单矩形水箱（兼容模式，保留原样式）。
    /// </summary>
    public static void Draw(
        DrawingContext context,
        Rect bounds,
        double waterLevel,
        Color waterColor,
        string name,
        string code,
        IBrush bgBrush,
        IBrush borderBrush,
        IBrush textPrimaryBrush,
        IBrush textTertiaryBrush,
        IBrush warningBrush,
        IBrush dangerBrush)
    {
        var x = bounds.X;
        var y = bounds.Y;
        var w = bounds.Width;
        var h = bounds.Height;

        // 箱体
        context.DrawRectangle(bgBrush, new Pen(borderBrush, 1.5), bounds, 3, 3);

        // 水位填充
        var clampedLevel = Math.Clamp(waterLevel, 0, 100);
        if (clampedLevel > 0.5)
        {
            var waterH = (h - 4) * clampedLevel / 100.0;
            var waterRect = new Rect(x + 2, y + h - 2 - waterH, w - 4, waterH);
            var waterBrush = new SolidColorBrush(waterColor, 0.65);
            context.DrawRectangle(waterBrush, null, waterRect);

            // 水面波纹
            var waveY = waterRect.Y;
            var waveBrush = new SolidColorBrush(waterColor, 0.35);
            for (int i = 0; i < 3; i++)
            {
                var wx = waterRect.X + 4 + i * (waterRect.Width / 3.0);
                context.DrawLine(new Pen(waveBrush, 1),
                    new Point(wx, waveY), new Point(wx + waterRect.Width / 6.0, waveY + 2));
            }
        }

        var centerX = x + w / 2;
        var centerY = y + h / 2;

        // 名称标签
        var nameFontSize = Math.Max(8, Math.Min(w, h) * 0.077);
        DrawTextAt(context, centerX - 20, y + 6, name, nameFontSize, textPrimaryBrush, FontWeight.Bold);

        var codeFontSize = Math.Max(8, Math.Min(w, h) * 0.063);
        DrawTextAt(context, centerX - 14, y + 20, code, codeFontSize, textTertiaryBrush);

        // 液位百分比
        var pctText = $"{clampedLevel:F1}%";
        IBrush pctColor = clampedLevel > 80 ? warningBrush :
                          clampedLevel < 20 ? dangerBrush :
                          new SolidColorBrush(waterColor);
        var pctFontSize = Math.Max(8, Math.Min(w, h) * 0.092);
        DrawTextAt(context, centerX - 18, centerY + 8, pctText, pctFontSize, pctColor, FontWeight.Bold);
    }

    // ════════════════════════════════════════════════════════
    //  剖面池（拟真模式）
    // ════════════════════════════════════════════════════════

    /// <summary>
    /// 绘制剖面式水池：池壁（混凝土质感）+ 液位填充 + 正弦波浪动画 +
    /// 液位大字 + 左侧刻度尺 + 彩色阈值横线。
    /// </summary>
    /// <param name="context">绘图上下文</param>
    /// <param name="bounds">池体矩形（屏幕坐标，含池壁）</param>
    /// <param name="waterLevel">当前液位（原始值，如米）</param>
    /// <param name="maxLevel">满量程液位（原始值）</param>
    /// <param name="waterColor">水体颜色</param>
    /// <param name="name">池名称</param>
    /// <param name="wavePhase">波浪动画相位（0~360）</param>
    /// <param name="thresholds">阈值线集合（按原始液位值）</param>
    /// <param name="palette">主题画刷</param>
    public static void DrawSection(
        DrawingContext context,
        Rect bounds,
        double waterLevel,
        double maxLevel,
        Color waterColor,
        string name,
        double wavePhase,
        IReadOnlyList<ThresholdLine> thresholds,
        SectionPalette palette)
    {
        var wall = Math.Max(4, Math.Min(bounds.Width, bounds.Height) * 0.06); // 池壁厚度
        var inner = new Rect(bounds.X + wall, bounds.Y + wall * 0.6,
                             bounds.Width - wall * 2, bounds.Height - wall * 0.6 - wall * 0.5);

        // ─── 池壁（外框，混凝土质感 + U 形实体壁）───
        // 池底
        var wallBrush = new SolidColorBrush(Color.FromArgb(180, 90, 98, 112));
        context.DrawRectangle(wallBrush, new Pen(ThemeHelper.Border, 1.5), bounds, 2, 2);

        // U 形内壁（左/右/底）
        var innerWall = new SolidColorBrush(Color.FromArgb(140, 55, 62, 74));
        // 左壁
        context.DrawRectangle(innerWall, null,
            new Rect(inner.X - wall, inner.Y, wall, inner.Height));
        // 右壁
        context.DrawRectangle(innerWall, null,
            new Rect(inner.Right, inner.Y, wall, inner.Height));
        // 池底
        context.DrawRectangle(innerWall, null,
            new Rect(inner.X, inner.Bottom, inner.Width, wall));

        // 内壁阴影线（增强立体感）
        context.DrawLine(new Pen(new SolidColorBrush(Color.FromArgb(100, 40, 45, 55)), 1.5),
            new Point(inner.X, inner.Y), new Point(inner.X, inner.Bottom));
        context.DrawLine(new Pen(new SolidColorBrush(Color.FromArgb(100, 40, 45, 55)), 1.5),
            new Point(inner.Right, inner.Y), new Point(inner.Right, inner.Bottom));
        context.DrawLine(new Pen(new SolidColorBrush(Color.FromArgb(100, 40, 45, 55)), 1.5),
            new Point(inner.X, inner.Bottom), new Point(inner.Right, inner.Bottom));

        // ─── 内腔背景 ───
        context.DrawRectangle(palette.CavityBrush, null, inner);

        // ── 液位填充 + 正弦波浪 ──
        if (maxLevel <= 0) maxLevel = 1;
        var levelPct = Math.Clamp(waterLevel / maxLevel, 0, 1);
        var waterTop = inner.Bottom - inner.Height * levelPct;

        // 波浪幅度随池高缩放（比旧版更明显）
        var amp1 = Math.Max(4, inner.Height * 0.045);

        if (levelPct > 0.01)
        {
            var waterRect = new Rect(inner.X, waterTop, inner.Width, inner.Bottom - waterTop);
            var waterBrush = new LinearGradientBrush
            {
                StartPoint = new RelativePoint(0, 0, RelativeUnit.Relative),
                EndPoint = new RelativePoint(0, 1, RelativeUnit.Relative),
                GradientStops =
                {
                    new GradientStop(Color.FromArgb(210, waterColor.R, waterColor.G, waterColor.B), 0),
                    new GradientStop(Color.FromArgb(120, waterColor.R, waterColor.G, waterColor.B), 1),
                }
            };
            context.DrawRectangle(waterBrush, null, waterRect);

            // 水面亮线（液面与空气交界处的高光）
            context.DrawLine(new Pen(new SolidColorBrush(Color.FromArgb(200, 255, 255, 255)), 1.8),
                new Point(inner.X + 1, waterTop), new Point(inner.Right - 1, waterTop));

            // 正弦波浪（3 层相位错开，半透明叠加）
            DrawWave(context, waterTop, inner, waterColor, wavePhase, 0.55, amp1, 1.0);
            DrawWave(context, waterTop + 2, inner, waterColor, wavePhase * 1.3 + 120, 0.32, amp1 * 1.3, 0.7);
            DrawWave(context, waterTop + 4, inner, waterColor, wavePhase * 0.8 + 240, 0.20, amp1 * 1.6, 0.5);

            // 池内气泡上升动画（6 个气泡，相位不同，持续上升）
            DrawBubbles(context, inner, waterRect, waterColor, wavePhase, levelPct);
        }
        else
        {
            // 空池：池底积水带 + 沉积示意，避免"死白框"
            var siltRect = new Rect(inner.X, inner.Bottom - inner.Height * 0.04, inner.Width, inner.Height * 0.04);
            context.DrawRectangle(new SolidColorBrush(Color.FromArgb(90, 110, 120, 100)), null, siltRect);
            var residRect = new Rect(inner.X, inner.Bottom - inner.Height * 0.02, inner.Width, inner.Height * 0.02);
            context.DrawRectangle(new SolidColorBrush(Color.FromArgb(140, waterColor.R, waterColor.G, waterColor.B)), null, residRect);
        }

        // ─── 阈值线（画在水位之上，一眼看出距离）───
        if (thresholds != null)
        {
            foreach (var th in thresholds)
            {
                if (th.Level <= 0 || th.Level > maxLevel) continue;
                var ty = inner.Bottom - inner.Height * Math.Clamp(th.Level / maxLevel, 0, 1);
                var pen = new Pen(new SolidColorBrush(th.Color, 0.9), 1.5, DashStyle.Dash);
                context.DrawLine(pen, new Point(inner.X, ty), new Point(inner.Right, ty));

                // 阈值标签（左侧小字，紧贴线上方）
                var label = $"{th.Label} {th.Level:F2}";
                var ft = new FormattedText(label, CultureInfo.CurrentCulture, FlowDirection.LeftToRight,
                    new Typeface("Microsoft YaHei", FontStyle.Normal, FontWeight.Bold),
                    Math.Max(8, inner.Height * 0.055),
                    new SolidColorBrush(th.Color));
                context.DrawText(ft, new Point(inner.X + 2, ty - ft.Height - 1));
            }
        }

        // ─── 当前液位值（气泡浮标：跟随水面高度，贴池右侧）───
        var valueText = $"{waterLevel:F2} m";
        var valueSize = Math.Max(11, inner.Height * 0.085);
        var valueFt = new FormattedText(valueText, CultureInfo.CurrentCulture, FlowDirection.LeftToRight,
            new Typeface("Consolas", FontStyle.Normal, FontWeight.Bold), valueSize, palette.TextPrimaryBrush);
        var badgeW = valueFt.Width + 14;
        var badgeH = valueFt.Height + 8;
        var badgeX = inner.Right - badgeW - 6;
        var badgeY = Math.Clamp(waterTop - badgeH - 8, inner.Y + 2, inner.Bottom - badgeH - 2);
        // 浮标牌 + 指向水面的指针
        var badgeRect = new Rect(badgeX, badgeY, badgeW, badgeH);
        context.DrawRectangle(palette.CavityBrush, new Pen(palette.BorderBrush, 1), badgeRect, 4, 4);
        context.DrawLine(new Pen(palette.BorderBrush, 1.2),
            new Point(badgeX + badgeW / 2, badgeY + badgeH),
            new Point(badgeX + badgeW / 2, waterTop));
        context.DrawEllipse(new SolidColorBrush(waterColor), null,
            new Rect(badgeX + badgeW / 2 - 3, waterTop - 3, 6, 6));
        context.DrawText(valueFt,
            new Point(badgeRect.Center.X - valueFt.Width / 2, badgeRect.Center.Y - valueFt.Height / 2));

        // ─── 池名称（顶部）───
        var nameSize = Math.Max(9, bounds.Height * 0.07);
        var nameFt = new FormattedText(name, CultureInfo.CurrentCulture, FlowDirection.LeftToRight,
            new Typeface("Microsoft YaHei", FontStyle.Normal, FontWeight.Bold), nameSize, palette.TextPrimaryBrush);
        context.DrawText(nameFt, new Point(bounds.X + (bounds.Width - nameFt.Width) / 2, bounds.Y - nameFt.Height - 2));

        // ─── 水面亮线（液面与空气交界处的高光）───
        if (levelPct > 0.01)
        {
            var waterRect = new Rect(inner.X, waterTop, inner.Width, inner.Bottom - waterTop);
            context.DrawLine(new Pen(new SolidColorBrush(Color.FromArgb(200, 255, 255, 255)), 1.8),
                new Point(inner.X + 1, waterTop), new Point(inner.Right - 1, waterTop));
        }

        // ─── 左侧刻度尺 ───
        DrawRuler(context, bounds, inner, maxLevel, palette);
    }

    /// <summary>池内气泡上升动画（6 个气泡，不同相位，从池底持续升起破裂）</summary>
    private static void DrawBubbles(DrawingContext context, Rect inner, Rect waterRect,
        Color waterColor, double phase, double levelPct)
    {
        const int bubbleCount = 6;
        var bubbleBrush = new SolidColorBrush(Color.FromArgb(120, waterColor.R, waterColor.G, waterColor.B));

        for (int i = 0; i < bubbleCount; i++)
        {
            // 每个气泡的相位偏移不同
            var p = (phase + i * 67) % 360;
            var t = p / 360.0; // 0→1 从池底到水面

            var bx = inner.X + inner.Width * (0.15 + (i * 0.14 + Math.Sin(p * 0.05) * 0.08));
            var by = inner.Bottom - inner.Height * levelPct * t - (inner.Height * 0.05); // 到水面以下

            // 气泡大小随上升略缩小
            var bSize = Math.Max(1.5, 3.5 * (1 - t * 0.3));
            var bubbleAlpha = (byte)(140 * (1 - t * 0.6));

            // 只在液面以下绘制
            if (by >= inner.Y && by <= waterRect.Bottom)
            {
                context.DrawEllipse(new SolidColorBrush(Color.FromArgb(bubbleAlpha,
                    waterColor.R, waterColor.G, waterColor.B)), null,
                    new Rect(bx - bSize, by - bSize, bSize * 2, bSize * 2));
            }
        }
    }

    /// <summary>绘制单层正弦波浪（填充至池底，裁剪在内腔范围内）</summary>
    private static void DrawWave(DrawingContext context, double topY, Rect inner,
        Color waterColor, double phase, double alpha, double amplitude, double wavelengthScale)
    {
        if (topY < inner.Y - amplitude || topY > inner.Bottom) return;

        const int steps = 24;
        var geometry = new StreamGeometry();
        using (var ctx = geometry.Open())
        {
            ctx.BeginFigure(new Point(inner.X, inner.Bottom), isFilled: true);

            // 从左到右沿正弦曲线采样
            for (int i = 0; i <= steps; i++)
            {
                var t = (double)i / steps;
                var px = inner.X + inner.Width * t;
                var py = topY + Math.Sin((t * Math.PI * 2 * wavelengthScale) + (phase * Math.PI / 180)) * amplitude;
                ctx.LineTo(new Point(px, py), isStroked: false);
            }

            // 闭合到池底
            ctx.EndFigure(true);
        }

        var brush = new SolidColorBrush(waterColor, alpha);
        context.DrawGeometry(brush, null, geometry);
    }

    /// <summary>左侧刻度尺（0~maxLevel，按 5 段标注）</summary>
    private static void DrawRuler(DrawingContext context, Rect bounds, Rect inner,
        double maxLevel, SectionPalette palette)
    {
        const int segments = 5;
        var tickLen = Math.Max(3, bounds.Width * 0.02);
        var fontSize = Math.Max(7, bounds.Height * 0.045);
        var pen = new Pen(palette.TextTertiaryBrush, 1);

        for (int i = 0; i <= segments; i++)
        {
            var value = maxLevel * i / segments;
            var y = inner.Bottom - inner.Height * ((double)i / segments);
            context.DrawLine(pen, new Point(bounds.X - tickLen, y), new Point(bounds.X - 1, y));

            var label = value.ToString("F1", CultureInfo.CurrentCulture);
            var ft = new FormattedText(label, CultureInfo.CurrentCulture, FlowDirection.LeftToRight,
                new Typeface("Consolas"), fontSize, palette.TextTertiaryBrush);
            context.DrawText(ft, new Point(bounds.X - tickLen - ft.Width - 2, y - ft.Height / 2));
        }
    }

    private static void DrawTextAt(DrawingContext context, double x, double y, string text,
        double size, IBrush brush, FontWeight weight = FontWeight.Normal)
    {
        var formatted = new FormattedText(text, CultureInfo.CurrentCulture, FlowDirection.LeftToRight,
            new Typeface("Microsoft YaHei", FontStyle.Normal, weight), size, brush);
        context.DrawText(formatted, new Point(x, y));
    }
}

/// <summary>剖面池主题画刷集（从 ThemeHelper 取色后传入，控件不用 DynamicResource）</summary>
public record SectionPalette(
    IBrush WallBrush,        // 池壁（混凝土）
    IBrush WallShadowBrush,  // 池壁内侧阴影线
    IBrush CavityBrush,      // 内腔背景
    IBrush BorderBrush,      // 边框
    IBrush TextPrimaryBrush, // 主文字
    IBrush TextTertiaryBrush // 辅助文字（刻度）
);