using System.Collections;
using System.Reflection.Metadata.Ecma335;
using System.Text;
using System.Text.RegularExpressions;
using YamlDotNet.Serialization;

namespace LocalModels;

public record LocalAssignment
{
  private string _name = "";
  public string Name
  {
    get => _name;
    init
    {
      if (value.Contains(':'))
        throw new AssignmentMarkdownParseException("Name cannot contain a ':' character, it breaks windows filesystems " + value);
      _name = value;
    }
  }
  public string Description { get; init; } = "";
  // public bool LockAtDueDate { get; init; }
  public DateTime? LockAt { get; init; }
  public DateTime DueAt { get; init; }
  public string? LocalAssignmentGroupName { get; init; }
  public IEnumerable<string> SubmissionTypes { get; init; } = Array.Empty<string>();
  public IEnumerable<RubricItem> Rubric { get; init; } = Array.Empty<RubricItem>();
  public int PointsPossible => Rubric.Sum(r => r.IsExtraCredit ? 0 : r.Points);
  public string GetRubricHtml()
  {
    var output = "<h2>Rubric</h2>";
    var lineStrings = Rubric.Select(
      item => $"- {item.Points}pts: {item.Label} <br/>"
    );
    output += string.Join("\n", lineStrings);
    return output;
  }

  public string GetDescriptionHtml()
  {
    var rubricHtml = GetRubricHtml();
    return Markdig.Markdown.ToHtml(Description) + "<hr>" + rubricHtml;
  }

  public ulong? GetCanvasAssignmentGroupId(IEnumerable<LocalAssignmentGroup> assignmentGroups) =>
    assignmentGroups
      .FirstOrDefault(g => g.Name == LocalAssignmentGroupName)?
      .CanvasId;

  public string ToMarkdown() => this.AssignmentToMarkdown();
  public string RubricToMarkdown() => this.AssignmentRubricToMarkdown();
  public static LocalAssignment ParseMarkdown(string input) => LocalAssignmentMarkdownParser.ParseMarkdown(input);
  public static IEnumerable<RubricItem> ParseRubricMarkdown(string rawMarkdown) => LocalAssignmentMarkdownParser.ParseRubricMarkdown(rawMarkdown);
}