namespace WxAgent.Core;

public sealed record WechatSessionSnapshot(string Name, string AutomationId, bool IsCurrent);

public sealed record WechatSessionSearchResult(string Name, string AutomationId, string? Category, bool IsExactMatch);

public static class WechatSessionParser
{
    public static IReadOnlyList<WechatSessionSnapshot> Parse(
        IEnumerable<(string AutomationId, string Name)> elements,
        string? currentName)
    {
        return elements
            .Where(element => element.AutomationId.StartsWith("session_item_", StringComparison.Ordinal) &&
                              !string.IsNullOrWhiteSpace(element.Name))
            .DistinctBy(element => element.AutomationId, StringComparer.Ordinal)
            .Select(element =>
            {
                var name = element.Name.Split('\n', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries).FirstOrDefault() ?? element.Name;
                return new WechatSessionSnapshot(name, element.AutomationId, string.Equals(name, currentName, StringComparison.Ordinal));
            })
            .ToArray();
    }

    public static IReadOnlyList<WechatSessionSearchResult> ParseSearchResults(
        IEnumerable<(string AutomationId, string AccessibleName)> elements,
        string query)
    {
        ArgumentException.ThrowIfNullOrWhiteSpace(query);
        return elements
            .Where(element => element.AutomationId.StartsWith("search_item_", StringComparison.Ordinal) &&
                              !string.IsNullOrWhiteSpace(element.AccessibleName))
            .DistinctBy(element => element.AutomationId, StringComparer.Ordinal)
            .Select(element =>
            {
                var lines = element.AccessibleName.Split('\n', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
                var exact = lines.FirstOrDefault(line => string.Equals(line, query, StringComparison.Ordinal));
                var name = exact ?? lines.Last();
                var category = lines.Length > 1 && !string.Equals(lines[0], name, StringComparison.Ordinal) ? lines[0] : null;
                return new WechatSessionSearchResult(name, element.AutomationId, category, exact is not null);
            })
            .ToArray();
    }
}