namespace AxCopilot.Services.Agent;

/// <summary>
/// AX Agent permission mode constants and normalization helpers.
/// Uses AX-native permission vocabulary only.
/// </summary>
public static class PermissionModeCatalog
{
    public const string Ask = "Ask";
    public const string Plan = "Plan";
    public const string Auto = "Auto";
    public const string Deny = "Deny";

    public static readonly IReadOnlyList<string> UserSelectableModes = new[]
    {
        Ask,
        Plan,
        Auto,
        Deny,
    };

    /// <summary>
    /// Normalize global permission mode.
    /// Supported values: ask/plan/auto/deny (case-insensitive).
    /// </summary>
    public static string NormalizeGlobalMode(string? value)
    {
        if (string.IsNullOrWhiteSpace(value))
            return Ask;

        return value.Trim().ToLowerInvariant() switch
        {
            "ask" => Ask,
            "plan" => Plan,
            "auto" => Auto,
            "deny" => Deny,
            _ => Ask,
        };
    }

    /// <summary>
    /// Normalize tool override permission.
    /// Tool override is constrained to ask/auto/deny.
    /// </summary>
    public static string NormalizeToolOverride(string? value)
    {
        var mode = NormalizeGlobalMode(value);
        return mode switch
        {
            Auto => "auto",
            Deny => "deny",
            _ => "ask",
        };
    }

    public static bool IsAuto(string? mode) =>
        string.Equals(NormalizeGlobalMode(mode), Auto, StringComparison.OrdinalIgnoreCase);

    public static bool IsDeny(string? mode) =>
        string.Equals(NormalizeGlobalMode(mode), Deny, StringComparison.OrdinalIgnoreCase);

    public static bool RequiresUserApproval(string? mode)
    {
        var normalized = NormalizeGlobalMode(mode);
        return !string.Equals(normalized, Auto, StringComparison.OrdinalIgnoreCase)
               && !string.Equals(normalized, Deny, StringComparison.OrdinalIgnoreCase);
    }
}