using System.Text.Json;
using Ananta.Server.Configuration;

namespace Ananta.Server.ClientData.Client4229938;

/// <summary>一条台词索引项。字段与 <c>DialogIndex.json</c> 的行一一对应。</summary>
internal sealed record DialogEntry(
    uint Id,
    string Message,
    string Speaker,
    uint CameraId,
    int Type)
{
    /// <summary>带镜头（cam != 0）= 这条是「过场对话」，会拉运镜；纯台词 cam 为 0。</summary>
    internal bool IsCutscene => CameraId != 0;
}

/// <summary>
/// 台詞索引（<c>Configs/DialogIndex.json</c>，58932 条，其中带镜头过场 1205 条）。
///
/// ★ 用途：GM 面板「剧情对话」子页用 <see cref="Search"/> 列出可播的台词，
///   玩家/开发者选中一条后由服务端推 <c>SyncShowDialog</c>(64967628) 让客户端播出来。
///   type 分布（前几类）：15=18941 / 14=16625 / 10=9503 / 13=6724 / 22=5258。
///
/// ⛑ 这份表只用于「列清单 + 取文案」；真正播什么由客户端按自己的 DialogConfig 演，
///   服务端发的只是 id —— 所以表里查不到的 id 也照样能下发（客户端有自己的数据）。
/// </summary>
internal static class StoryDialogue4229938
{
    private static readonly Lazy<(IReadOnlyList<DialogEntry> All, Dictionary<uint, DialogEntry> ById)> Cache = new(Load);

    internal static IReadOnlyList<DialogEntry> All => Cache.Value.All;

    internal static int Count => Cache.Value.All.Count;

    internal static int CutsceneCount => Cache.Value.All.Count(x => x.IsCutscene);

    internal static DialogEntry? Find(uint id)
        => Cache.Value.ById.TryGetValue(id, out var e) ? e : null;

    /// <summary>按关键词（文案 / 说话人 / id 片段）搜索；<paramref name="cutsceneOnly"/> 可只看过场。</summary>
    internal static IReadOnlyList<DialogEntry> Search(string? keyword, bool? cutsceneOnly, int limit)
    {
        IEnumerable<DialogEntry> q = Cache.Value.All;

        if (cutsceneOnly is { } want)
            q = q.Where(x => x.IsCutscene == want);

        if (!string.IsNullOrWhiteSpace(keyword))
        {
            var k = keyword.Trim();
            q = q.Where(x =>
                x.Message.Contains(k, StringComparison.OrdinalIgnoreCase)
                || x.Speaker.Contains(k, StringComparison.OrdinalIgnoreCase)
                || x.Id.ToString().Contains(k, StringComparison.Ordinal));
        }

        return q.Take(Math.Clamp(limit, 1, 3000)).ToList();
    }

    private static (IReadOnlyList<DialogEntry>, Dictionary<uint, DialogEntry>) Load()
    {
        try
        {
            var root = PrivateServerConfigStore.ResolveProjectPath(
                PrivateServerConfigStore.Current.Paths.ClientConfigs);
            var path = Path.Combine(root, "DialogIndex.json");
            if (!File.Exists(path))
                return ([], new Dictionary<uint, DialogEntry>());

            using var doc = JsonDocument.Parse(File.ReadAllText(path));
            if (!doc.RootElement.TryGetProperty("dialogs", out var arr) || arr.ValueKind != JsonValueKind.Array)
                return ([], new Dictionary<uint, DialogEntry>());

            var list = new List<DialogEntry>(arr.GetArrayLength());
            var byId = new Dictionary<uint, DialogEntry>(arr.GetArrayLength());
            foreach (var item in arr.EnumerateArray())
            {
                static string Str(JsonElement e, string name)
                    => e.TryGetProperty(name, out var n) && n.ValueKind == JsonValueKind.String
                        ? n.GetString() ?? string.Empty
                        : string.Empty;

                var entry = new DialogEntry(
                    item.TryGetProperty("id", out var pi) && pi.TryGetUInt32(out var id) ? id : 0u,
                    Str(item, "msg"),
                    Str(item, "spk"),
                    item.TryGetProperty("cam", out var pc) && pc.TryGetUInt32(out var cam) ? cam : 0u,
                    item.TryGetProperty("type", out var pt) && pt.TryGetInt32(out var tv) ? tv : 0);

                list.Add(entry);
                if (entry.Id != 0)
                    byId[entry.Id] = entry;
            }

            Console.WriteLine($"[STORY] 台词索引已载入 {list.Count} 条（带镜头过场 {list.Count(x => x.IsCutscene)} 条）");
            return (list, byId);
        }
        catch (Exception ex)
        {
            Console.WriteLine($"[STORY] 载入台词索引失败: {ex.GetType().Name}: {ex.Message}");
            return ([], new Dictionary<uint, DialogEntry>());
        }
    }
}