using MareSynchronos.API.Data;
using MareSynchronos.FileCache;
using MareSynchronos.PlayerData.Handlers;
using MareSynchronos.Services.Mediator;
using MareSynchronos.WebAPI.Files.Models;
using Microsoft.Extensions.Logging;

namespace MareSynchronos.Services;

public class PlayerPerformanceService
{
    private readonly FileCacheManager _fileCacheManager;
    private readonly XivDataAnalyzer _xivDataAnalyzer;
    private readonly ILogger<PlayerPerformanceService> _logger;
    private readonly MareMediator _mediator;

    public PlayerPerformanceService(ILogger<PlayerPerformanceService> logger, MareMediator mediator,
        FileCacheManager fileCacheManager,
        XivDataAnalyzer xivDataAnalyzer)
    {
        _logger = logger;
        _mediator = mediator;
        _fileCacheManager = fileCacheManager;
        _xivDataAnalyzer = xivDataAnalyzer;
    }

    public async Task<bool> CheckBothThresholds(PairHandler pairHandler, CharacterData charaData)
    {
        bool notPausedAfterVram = ComputeAndAutoPauseOnVRAMUsageThresholds(pairHandler, charaData, []);
        if (!notPausedAfterVram) return false;
        bool notPausedAfterTris = await CheckTriangleUsageThresholds(pairHandler, charaData).ConfigureAwait(false);
        if (!notPausedAfterTris) return false;

        return true;
    }

    public async Task<bool> CheckTriangleUsageThresholds(PairHandler pairHandler, CharacterData charaData)
    {
        var pair = pairHandler.Pair;

        long triUsage = 0;

        if (!charaData.FileReplacements.TryGetValue(API.Data.Enum.ObjectKind.Player, out List<FileReplacementData>? playerReplacements))
        {
            pair.LastAppliedDataTris = 0;
            return true;
        }

        var moddedModelHashes = playerReplacements.Where(p => string.IsNullOrEmpty(p.FileSwapPath) && p.GamePaths.Any(g => g.EndsWith("mdl", StringComparison.OrdinalIgnoreCase)))
            .Select(p => p.Hash)
            .Distinct(StringComparer.OrdinalIgnoreCase)
            .ToList();

        foreach (var hash in moddedModelHashes)
        {
            triUsage += await _xivDataAnalyzer.GetTrianglesByHash(hash).ConfigureAwait(false);
        }

        pair.LastAppliedDataTris = triUsage;

        _logger.LogDebug("Calculated VRAM usage for {p}", pairHandler);

        return true;
    }

    public bool ComputeAndAutoPauseOnVRAMUsageThresholds(PairHandler pairHandler, CharacterData charaData, List<DownloadFileTransfer> toDownloadFiles)
    {
        var pair = pairHandler.Pair;

        long vramUsage = 0;

        if (!charaData.FileReplacements.TryGetValue(API.Data.Enum.ObjectKind.Player, out List<FileReplacementData>? playerReplacements))
        {
            pair.LastAppliedApproximateVRAMBytes = 0;
            return true;
        }

        var moddedTextureHashes = playerReplacements.Where(p => string.IsNullOrEmpty(p.FileSwapPath) && p.GamePaths.Any(g => g.EndsWith(".tex", StringComparison.OrdinalIgnoreCase)))
            .Select(p => p.Hash)
            .Distinct(StringComparer.OrdinalIgnoreCase)
            .ToList();

        foreach (var hash in moddedTextureHashes)
        {
            long fileSize = 0;

            var download = toDownloadFiles.Find(f => string.Equals(hash, f.Hash, StringComparison.OrdinalIgnoreCase));
            if (download != null)
            {
                fileSize = download.TotalRaw;
            }
            else
            {
                var fileEntry = _fileCacheManager.GetFileCacheByHash(hash);
                if (fileEntry == null) continue;

                if (fileEntry.Size == null)
                {
                    fileEntry.Size = new FileInfo(fileEntry.ResolvedFilepath).Length;
                    _fileCacheManager.UpdateHashedFile(fileEntry, computeProperties: true);
                }

                fileSize = fileEntry.Size.Value;
            }

            vramUsage += fileSize;
        }

        pair.LastAppliedApproximateVRAMBytes = vramUsage;

        _logger.LogDebug("Calculated VRAM usage for {p}", pairHandler);

        return true;
    }
}