namespace Nuuru.Server.Services.Search.Tokens;

/// <summary>
/// Base class for all search tokens produced by the tokenizer.
/// </summary>
public abstract record SearchToken;

/// <summary>
/// A regular tag to include in search results.
/// </summary>
public record TagToken(string Name) : SearchToken;

/// <summary>
/// A tag to exclude from search results (prefixed with -).
/// </summary>
public record NegatedTagToken(string Name) : SearchToken;

/// <summary>
/// A wildcard tag pattern (ending with *).
/// </summary>
public record WildcardTagToken(string Prefix, bool Negated = false) : SearchToken;

/// <summary>
/// Start of an OR group ({).
/// </summary>
public record OrGroupStartToken : SearchToken;

/// <summary>
/// End of an OR group (}).
/// </summary>
public record OrGroupEndToken : SearchToken;

/// <summary>
/// OR separator within a group (~).
/// </summary>
public record OrSeparatorToken : SearchToken;

/// <summary>
/// A meta-tag for filtering by post properties (e.g., rating:safe, id:>100).
/// </summary>
public record MetaTagToken(string Key, MetaOperator Operator, string Value, bool Negated = false) : SearchToken;

/// <summary>
/// Operators for meta-tag comparisons.
/// </summary>
public enum MetaOperator
{
    /// <summary>Exact match (rating:safe)</summary>
    Equals,
    /// <summary>Greater than (id:>100)</summary>
    GreaterThan,
    /// <summary>Less than (id:&lt;100)</summary>
    LessThan,
    /// <summary>Greater than or equal (id:>=100)</summary>
    GreaterThanOrEqual,
    /// <summary>Less than or equal (id:&lt;=100)</summary>
    LessThanOrEqual,
    /// <summary>Range (id:100..200)</summary>
    Range
}