using Microsoft.EntityFrameworkCore;
using RadicadeServer.DB;
using RadicadeServer.RecNet.Config;
using System.Text.Json;

namespace RadicadeServer.API.Rooms.V1;

internal sealed class RoomAssetRecord
{
    public string Id { get; set; } = "";
    public long RoomId { get; set; }
    public string Kind { get; set; } = "";
    public Dictionary<string, object?> Fields { get; set; } = new(StringComparer.OrdinalIgnoreCase);
}

internal static class RoomAssetStore
{
    private const string ConfigKey = "RoomAssets";
    private static readonly SemaphoreSlim Gate = new(1, 1);

    public static async Task<List<RoomAssetRecord>> LoadAsync(RecDBContext db)
    {
        var config = await db.ServerConfig.AsNoTracking().FirstOrDefaultAsync(row => row.Key == ConfigKey);
        if (string.IsNullOrWhiteSpace(config?.Value)) return new List<RoomAssetRecord>();

        try
        {
            return JsonSerializer.Deserialize<List<RoomAssetRecord>>(config.Value,
                new JsonSerializerOptions { PropertyNameCaseInsensitive = true }) ?? new List<RoomAssetRecord>();
        }
        catch (JsonException)
        {
            return new List<RoomAssetRecord>();
        }
    }

    public static async Task<List<RoomAssetRecord>> ForRoomAsync(RecDBContext db, long roomId, string kind)
    {
        var records = await LoadAsync(db);
        return records.Where(record => record.RoomId == roomId &&
            string.Equals(record.Kind, kind, StringComparison.OrdinalIgnoreCase)).ToList();
    }

    public static async Task SaveAsync(RecDBContext db, RoomAssetRecord record)
    {
        await Gate.WaitAsync();
        try
        {
            var config = await db.ServerConfig.FirstOrDefaultAsync(row => row.Key == ConfigKey);
            List<RoomAssetRecord> records;
            try
            {
                records = string.IsNullOrWhiteSpace(config?.Value)
                    ? new List<RoomAssetRecord>()
                    : JsonSerializer.Deserialize<List<RoomAssetRecord>>(config.Value,
                        new JsonSerializerOptions { PropertyNameCaseInsensitive = true }) ?? new List<RoomAssetRecord>();
            }
            catch (JsonException)
            {
                records = new List<RoomAssetRecord>();
            }

            records.RemoveAll(existing => existing.RoomId == record.RoomId &&
                string.Equals(existing.Kind, record.Kind, StringComparison.OrdinalIgnoreCase) &&
                existing.Id == record.Id);
            records.Add(record);
            if (config == null)
            {
                config = new ServerConfigVal(ConfigKey, JsonSerializer.Serialize(records));
                await db.ServerConfig.AddAsync(config);
            }
            else
            {
                config.Value = JsonSerializer.Serialize(records);
            }
            await db.SaveChangesAsync();
        }
        finally
        {
            Gate.Release();
        }
    }

    public static async Task<List<Dictionary<string, object?>>> GetDtosAsync(RecDBContext db, long roomId, string kind)
    {
        var records = await ForRoomAsync(db, roomId, kind);
        return records.Select(record =>
        {
            var dto = new Dictionary<string, object?>(record.Fields, StringComparer.OrdinalIgnoreCase);
            dto[kind.Equals("currency", StringComparison.OrdinalIgnoreCase) ? "CurrencyId" : "ConsumableId"] = record.Id;
            dto["RoomId"] = record.RoomId;
            return dto;
        }).ToList();
    }
}