namespace WxAgent.Core;

public sealed record WechatContactSnapshot(
    string DisplayName,
    string? WechatId = null,
    IReadOnlyList<string>? Tags = null,
    string? Signature = null,
    string? Source = null,
    int? CommonGroupCount = null,
    string? Username = null);

public sealed record WechatNewFriendSnapshot(string DisplayName, string Status);

public sealed record WechatGroupMemberSnapshot(string DisplayName, string? GroupNickname = null, bool IsOwner = false);

public sealed record WechatSubWindowSnapshot(string Title, string Kind, int ProcessId);

public sealed record WechatAccountSnapshot(string DisplayName, string? WechatId = null, string? Region = null);

public sealed record WechatOperationResult(bool Success, WxAgentErrorCode? Code, string Message)
{
    public static WechatOperationResult Ok(string message = "ok") => new(true, null, message);

    public static WechatOperationResult Unconfirmed(string operation) => new(false, WxAgentErrorCode.ResultUnconfirmed,
        $"{operation} was submitted but its business result was not verified. Do not retry automatically.");
}

public static class WechatOperationPolicy
{
    public const string Confirmation = "CONFIRM";

    public static void RequireConfirmation(string? confirmation, string operation)
    {
        if (!string.Equals(confirmation, Confirmation, StringComparison.Ordinal))
        {
            throw new WxAgentException(
                WxAgentErrorCode.InvalidArgument,
                $"{operation} requires explicit confirmation '{Confirmation}'.");
        }
    }

    public static void ValidateNames(IEnumerable<string> names, string parameterName)
    {
        ArgumentNullException.ThrowIfNull(names);
        var values = names.ToArray();
        if (values.Length == 0 || values.Any(string.IsNullOrWhiteSpace) ||
            values.Distinct(StringComparer.Ordinal).Count() != values.Length)
        {
            throw new WxAgentException(WxAgentErrorCode.InvalidArgument, $"{parameterName} must contain unique, non-empty names.");
        }
    }

    public static T RequireUnique<T>(IEnumerable<T> candidates, string controlDescription)
    {
        var matches = candidates.Take(2).ToArray();
        if (matches.Length != 1)
            throw new WxAgentException(WxAgentErrorCode.ControlNotFound,
                $"A unique {controlDescription} was not found; no target was selected.");
        return matches[0];
    }
}