using Core.Entities;

namespace Core.Models;

/// <summary>
/// Result of parsing event occurrence text data.
/// Contains parsed occurrences, errors, and warnings.
/// </summary>
public class EventOccurrenceParseResult
{
    /// <summary>
    /// Dictionary of parsed event occurrences, keyed by EventDefinition.
    /// For special events (GeneralSchedule, MeetTheCandidates, ChapterOfficerMeeting, VotingDelegateMeeting, SocialGathering), 
    /// the EventDefinition key will be the static instance.
    /// </summary>
    public IDictionary<EventDefinition, List<EventOccurrence>> Occurrences { get; set; } = new Dictionary<EventDefinition, List<EventOccurrence>>();

    /// <summary>
    /// List of parsing errors (critical issues that prevented parsing).
    /// </summary>
    public List<string> Errors { get; set; } = new();

    /// <summary>
    /// List of parsing warnings (non-critical issues that occurred during parsing).
    /// </summary>
    public List<string> Warnings { get; set; } = new();

    /// <summary>
    /// List of detailed parsing issues with line numbers and specific problem descriptions.
    /// </summary>
    public List<ParsingIssue> Issues { get; set; } = new();

    /// <summary>
    /// List of section headers that were encountered but skipped
    /// because they don't match the chapter's school level setting.
    /// Headers may contain " - MS" or " - HS" to indicate school level.
    /// </summary>
    public List<string> SkippedSectionHeaders { get; set; } = new();

    /// <summary>
    /// Number of event occurrences that were skipped due to school level filtering.
    /// This includes both MS and HS events that don't match the chapter's school level setting.
    /// </summary>
    public int SkippedEventCount { get; set; }

    /// <summary>
    /// Footnotes captured for each event definition. Footnotes are lines that start with "*" or are parenthetical notes.
    /// Multiple footnotes are concatenated into a single string. These provide additional context or information about the event occurrences.
    /// </summary>
    public IDictionary<EventDefinition, string> Footnotes { get; set; } = new Dictionary<EventDefinition, string>();

    /// <summary>
    /// Total number of event occurrences successfully parsed.
    /// </summary>
    public int TotalParsed => Occurrences.Values.Sum(list => list.Count);

    /// <summary>
    /// Indicates whether parsing was successful (no errors).
    /// </summary>
    public bool IsSuccess => Errors.Count == 0;
}

/// <summary>
/// Represents a detailed parsing issue encountered during event occurrence parsing.
/// </summary>
public class ParsingIssue
{
    /// <summary>
    /// The line number where the issue occurred (1-based).
    /// </summary>
    public int LineNumber { get; set; }

    /// <summary>
    /// The column number where the issue occurred (1-based, 0 if not available).
    /// </summary>
    public int ColumnNumber { get; set; }

    /// <summary>
    /// The actual line content where the issue occurred.
    /// </summary>
    public string LineContent { get; set; } = string.Empty;

    /// <summary>
    /// The type of parsing issue.
    /// </summary>
    public ParsingIssueType IssueType { get; set; }

    /// <summary>
    /// Human-readable description of the issue.
    /// </summary>
    public string Message { get; set; } = string.Empty;

    /// <summary>
    /// What was expected at the error location (e.g., "month name", "MS or HS", "time value").
    /// </summary>
    public string Expected { get; set; } = string.Empty;

    /// <summary>
    /// What was actually found at the error location.
    /// </summary>
    public string Found { get; set; } = string.Empty;
}

/// <summary>
/// Types of parsing issues that can occur during event occurrence parsing.
/// </summary>
public enum ParsingIssueType
{
    /// <summary>
    /// Line doesn't match the expected format pattern.
    /// </summary>
    UnmatchedLine,

    /// <summary>
    /// Line matches format but event definition cannot be determined.
    /// </summary>
    MissingEventDefinition,

    /// <summary>
    /// Time parsing failed (regex doesn't match or parse errors).
    /// </summary>
    TimeParseFailure,

    /// <summary>
    /// Date parsing failed (invalid day of month, etc.).
    /// </summary>
    DateParseFailure,

    /// <summary>
    /// Invalid format or other parsing issue.
    /// </summary>
    InvalidFormat
}