using SQLLinter.Common;
using SQLLinter.Infrastructure.Diagram;
using System.Reflection;
using System.Text;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace SQLLinter.Infrastructure.Reporters;

public class HtmlReportFormatter : IReportFormatter
{
    public string Format(List<IRuleViolation> violations)
        => Format(violations, null);

    public string Format(List<IRuleViolation> violations, BpmnDiagram? diagram)
    {
        var sb = new StringBuilder();
        GenerateBeginningHtml(sb);

        // Подготовка данных для передачи в JS
        var reportData = PrepareReportData(violations, diagram);
        var jsonData = JsonSerializer.Serialize(reportData, new JsonSerializerOptions
        {
            PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
            DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull
        });

        if (violations.Count == 0 && diagram == null)
        {
            // Случай без нарушений
            sb.AppendLine("<div class=\"no-violations\">");
            sb.AppendLine("<div class=\"no-violations-content\">");
            sb.AppendLine("<div class=\"no-violations-icon\">✅</div>");
            sb.AppendLine("<h3 class=\"no-violations-title\">Проверка завершена</h3>");
            sb.AppendLine("<p class=\"no-violations-description\">Нарушений правил SQL не обнаружено.</p>");
            sb.AppendLine("</div>");
            sb.AppendLine("</div>");

            GenerateEndingHtml(sb, false, HtmlMinifier.CompressJson(jsonData));
            return sb.ToString();
        }

        // Основной контейнер для отчета
        sb.AppendLine("""
            <div id="reports-container"></div>
            <div id="tabs-container" class="tabs-container">
                <div class="tabs" id="tabs-list"></div>
            </div>
            """);

        GenerateEndingHtml(sb, diagram != null, jsonData);

        var html = HtmlMinifier.MinifyHtml(sb.ToString());
        return html;
    }

    private ReportData PrepareReportData(List<IRuleViolation> violations, BpmnDiagram? diagram)
    {
        var reportData = new ReportData();

        // Группировка по файлам
        var groupedByFile = violations
            .GroupBy(v => v.FileName)
            .OrderBy(g => g.Key)
            .ToList();

        foreach (var fileGroup in groupedByFile)
        {
            var fileData = new FileReportData
            {
                FileName = fileGroup.Key
            };

            // Группировка по severity
            var severityGroups = fileGroup
                .GroupBy(v => v.Severity)
                .OrderByDescending(g => g.Key)
                .ToList();

            foreach (var severityGroup in severityGroups)
            {
                var violationsList = severityGroup
                    .OrderBy(v => v.Line)
                    .ThenBy(v => v.Column)
                    .Select(v => new ViolationData
                    {
                        Line = v.Line,
                        Column = v.Column,
                        RuleName = v.RuleName,
                        Text = EscapeHtml(v.Text),
                        Index = severityGroup.ToList().IndexOf(v) + 1
                    })
                    .ToList();

                if (severityGroup.Key == RuleViolationSeverity.Critical)
                    fileData.CriticalViolations = violationsList;
                else if (severityGroup.Key == RuleViolationSeverity.Warning)
                    fileData.WarningViolations = violationsList;
                else if (severityGroup.Key == RuleViolationSeverity.Info)
                    fileData.InfoViolations = violationsList;
            }

            reportData.Files.Add(fileData);
        }

        // Добавление диаграммы, если есть
        if (diagram != null)
        {
            reportData.Diagram = new DiagramData
            {
                MermaidContent = MermaidRenderer.ToMermaidContent(diagram),
                HasDiagram = true
            };
        }

        return reportData;
    }

    private void GenerateBeginningHtml(StringBuilder sb)
    {
        sb.AppendLine("""
            <!DOCTYPE html>
            <html lang="ru">
            <head>
            <meta charset="UTF-8">
            <meta name="viewport" content="width=device-width, initial-scale=1.0">
            <title>Отчёт по SQL‑проверкам</title>
            <style>
            """);

        sb.AppendLine(LoadResource("HtmlFormatter.css"));
        sb.AppendLine("</style></head><body><main id=\"main-content\">");
    }

    private void GenerateEndingHtml(StringBuilder sb, bool hasDiagram, string jsonData)
    {
        // Вставка JSON данных
        sb.AppendLine($"""
            <script id="report-data" type="application/json">
            {jsonData}
            </script>
            """);

        sb.AppendLine("""
            <script type="module">
            """);

        // Загружаем основной JS
        sb.AppendLine(LoadResource("HtmlFormatter.js"));

        sb.AppendLine("""
            </script>
            </body>
            </html>
            """);
    }

    private static string LoadResource(string endsWith)
    {
        var assembly = Assembly.GetExecutingAssembly();
        var name = assembly.GetManifestResourceNames()
                           .First(n => n.EndsWith(endsWith, StringComparison.OrdinalIgnoreCase));
        using var stream = assembly.GetManifestResourceStream(name);
        using var reader = new StreamReader(stream);
        return reader.ReadToEnd();
    }

    private static string EscapeHtml(string text)
    {
        return System.Net.WebUtility.HtmlEncode(text);
    }

    // Классы для сериализации
    private class ReportData
    {
        public List<FileReportData> Files { get; set; } = new();
        public DiagramData? Diagram { get; set; }
    }

    private class FileReportData
    {
        public string FileName { get; set; } = string.Empty;
        public List<ViolationData>? CriticalViolations { get; set; }
        public List<ViolationData>? WarningViolations { get; set; }
        public List<ViolationData>? InfoViolations { get; set; }

        [JsonIgnore]
        public int TotalViolations =>
            (CriticalViolations?.Count ?? 0) +
            (WarningViolations?.Count ?? 0) +
            (InfoViolations?.Count ?? 0);
    }

    private class ViolationData
    {
        public int Index { get; set; }
        public int Line { get; set; }
        public int Column { get; set; }
        public string RuleName { get; set; } = string.Empty;
        public string Text { get; set; } = string.Empty;
    }

    private class DiagramData
    {
        public string MermaidContent { get; set; } = string.Empty;
        public bool HasDiagram { get; set; }
    }
}