using MAF1.Agents;

namespace MAF1.Decisions;

public sealed class DecisionRequest
{
    public string Id { get; set; } = "";
    public string NodeId { get; set; } = "";
    public string Prompt { get; set; } = "";
    public string? Reason { get; set; }
    public List<DecisionOption> Options { get; set; } = [];
    public string DefaultOptionId { get; set; } = "";
    public int TimeoutSeconds { get; set; }
    public DateTimeOffset Deadline { get; set; }
}

public sealed class DecisionOption
{
    public string Id { get; set; } = "";
    public string Label { get; set; } = "";
    public string? Description { get; set; }
    public bool RequiresText { get; set; }
    public string? TextPlaceholder { get; set; }
    public bool IsDefault { get; set; }
}

public sealed class DecisionAnswer
{
    public string OptionId { get; set; } = "";
    public string? Text { get; set; }
    public bool TimedOut { get; set; }
}

public static class DecisionOptionIds
{
    public const string Stop = "stop";
    public const string QueryCities = "query-cities";
}

public static class EmptyCityDecision
{
    public static DecisionRequest Create(string nodeId, string? reason, int timeoutSeconds)
    {
        int seconds = Math.Clamp(timeoutSeconds, 1, 600);
        return new DecisionRequest
        {
            Id = Guid.NewGuid().ToString("n")[..12],
            NodeId = nodeId,
            Reason = reason,
            Prompt = "没有读到有效城市。默认结束后续查询；也可以改填其它城市后继续。超时将自动采用默认方案。",
            DefaultOptionId = DecisionOptionIds.Stop,
            TimeoutSeconds = seconds,
            Deadline = DateTimeOffset.UtcNow.AddSeconds(seconds),
            Options =
            [
                new DecisionOption
                {
                    Id = DecisionOptionIds.Stop,
                    Label = "结束查询（默认）",
                    Description = "保持当前结果，跳过需要城市的后续节点。",
                    IsDefault = true,
                },
                new DecisionOption
                {
                    Id = DecisionOptionIds.QueryCities,
                    Label = "改查其它城市",
                    Description = "手动输入城市名，下游天气节点会按这份名单继续。",
                    RequiresText = true,
                    TextPlaceholder = "例如：成都、北京",
                },
            ],
        };
    }

    public static bool TryContinueWithCities(DecisionAnswer answer, out List<string> cities)
    {
        cities = [];
        if (answer.TimedOut)
        {
            return false;
        }

        bool queryCities = answer.OptionId.Equals(DecisionOptionIds.QueryCities, StringComparison.OrdinalIgnoreCase);
        if (!queryCities)
        {
            return false;
        }

        cities = ParseCities(answer.Text);
        return cities.Count > 0;
    }

    public static List<string> ParseCities(string? text)
        => AgentInputs.ReadStringList(
            new Dictionary<string, object?>(StringComparer.OrdinalIgnoreCase) { ["cities"] = text },
            "cities");
}