using System.Globalization;
using System.Text.Json;
using Fake.Application;
using Fake.DependencyInjection;

namespace Oms.Application.Labeling.Hiprint;

/// <summary>
/// 将 hiprint TemplateJson 转为中间绘制 IR。
/// </summary>
public sealed class HiprintTemplateParser : ITransientDependency
{
    private static readonly JsonSerializerOptions JsonOptions = new()
    {
        PropertyNameCaseInsensitive = true,
        ReadCommentHandling = JsonCommentHandling.Skip,
        AllowTrailingCommas = true
    };

    public LabelPageIr Parse(string templateJson, IReadOnlyDictionary<string, object?> printData)
    {
        if (string.IsNullOrWhiteSpace(templateJson))
        {
            throw new ArgumentException("模板 JSON 为空", nameof(templateJson));
        }

        var doc = JsonSerializer.Deserialize<HiprintTemplateDocument>(templateJson, JsonOptions)
                  ?? throw new BusinessException("模板 JSON 无法解析");

        var panel = doc.Panels.OrderBy(x => x.Index).FirstOrDefault()
                    ?? throw new BusinessException("模板缺少 panels");

        var widthMm = panel.Width > 0 ? panel.Width : 100f;
        var heightMm = panel.Height > 0 ? panel.Height : 150f;
        var ops = new List<LabelDrawOp>();

        foreach (var element in panel.PrintElements)
        {
            var op = MapElement(element, printData);
            if (op != null)
            {
                ops.Add(op);
            }
        }

        return new LabelPageIr
        {
            WidthMm = widthMm,
            HeightMm = heightMm,
            Ops = ops
        };
    }

    private static LabelDrawOp? MapElement(
        HiprintPrintElement element,
        IReadOnlyDictionary<string, object?> printData)
    {
        var type = element.PrintElementType?.Type?.Trim().ToLowerInvariant() ?? "text";
        var opt = element.Options;
        var left = opt.Left;
        var top = opt.Top;
        var width = Math.Max(opt.Width, 1f);
        var height = Math.Max(opt.Height, 1f);

        switch (type)
        {
            case "hline":
                return new LabelLineOp
                {
                    LeftPt = left,
                    TopPt = top,
                    WidthPt = width,
                    HeightPt = Math.Max(opt.BorderWidth ?? 1f, 0.5f),
                    Vertical = false,
                    ColorHex = opt.Color,
                    ThicknessPt = opt.BorderWidth ?? 1f
                };
            case "vline":
                return new LabelLineOp
                {
                    LeftPt = left,
                    TopPt = top,
                    WidthPt = Math.Max(opt.BorderWidth ?? 1f, 0.5f),
                    HeightPt = height,
                    Vertical = true,
                    ColorHex = opt.Color,
                    ThicknessPt = opt.BorderWidth ?? 1f
                };
            case "rect":
                return new LabelRectOp
                {
                    LeftPt = left,
                    TopPt = top,
                    WidthPt = width,
                    HeightPt = height,
                    BorderColorHex = opt.Color,
                    BorderWidthPt = opt.BorderWidth ?? 1f
                };
            case "image":
                return new LabelImageOp
                {
                    LeftPt = left,
                    TopPt = top,
                    WidthPt = width,
                    HeightPt = height,
                    Src = ResolveValue(opt.Field, opt.Src ?? opt.Title, printData)
                };
            case "longtext":
                return BuildTextOp(opt, left, top, width, height, printData, wrap: true);
            case "text":
            default:
            {
                var textType = opt.TextType?.Trim().ToLowerInvariant();
                if (textType is "barcode" or "qrcode")
                {
                    var content = ResolveValue(opt.Field, opt.Title, printData);
                    if (string.IsNullOrWhiteSpace(content))
                    {
                        return null;
                    }

                    return new LabelBarcodeOp
                    {
                        LeftPt = left,
                        TopPt = top,
                        WidthPt = width,
                        HeightPt = height,
                        Content = content,
                        QrCode = textType == "qrcode"
                    };
                }

                return BuildTextOp(opt, left, top, width, height, printData, wrap: false);
            }
        }
    }

    private static LabelTextOp? BuildTextOp(
        HiprintElementOptions opt,
        float left,
        float top,
        float width,
        float height,
        IReadOnlyDictionary<string, object?> printData,
        bool wrap)
    {
        var value = ResolveValue(opt.Field, null, printData);
        string text;
        if (!string.IsNullOrWhiteSpace(opt.Field))
        {
            // 有 field：默认只打字段值；hideTitle=false 且有 title 时拼「标题:值」
            if (opt.HideTitle == false && !string.IsNullOrWhiteSpace(opt.Title) && !string.IsNullOrWhiteSpace(value))
            {
                text = $"{opt.Title}:{value}";
            }
            else
            {
                text = value ?? string.Empty;
            }
        }
        else
        {
            text = opt.Title ?? string.Empty;
        }

        if (string.IsNullOrWhiteSpace(text))
        {
            return null;
        }

        var bold = string.Equals(opt.FontWeight, "bold", StringComparison.OrdinalIgnoreCase)
                   || opt.FontWeight is "700" or "600";

        return new LabelTextOp
        {
            LeftPt = left,
            TopPt = top,
            WidthPt = width,
            HeightPt = height,
            Text = text,
            FontSizePt = opt.FontSize is > 0 ? opt.FontSize.Value : 10f,
            Bold = bold,
            ColorHex = opt.Color,
            Align = (opt.TextAlign ?? "left").ToLowerInvariant(),
            Wrap = wrap
        };
    }

    private static string? ResolveValue(
        string? field,
        string? fallback,
        IReadOnlyDictionary<string, object?> printData)
    {
        if (!string.IsNullOrWhiteSpace(field) && printData.TryGetValue(field, out var raw) && raw != null)
        {
            return Convert.ToString(raw, CultureInfo.InvariantCulture);
        }

        return fallback;
    }
}