using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
using UnityEditor;
using UnityEditor.Build.Reporting;
using UnityEngine;

namespace Luneraria.EditorTools
{
    /// <summary>
    /// Player builds (U2D). Only macOS is possible on this machine; Windows and Linux need the build
    /// modules listed in docs/port/U1.5-UNITY.md. Output goes to Builds/ (ignored by git).
    /// Unity -batchmode -projectPath . -executeMethod Luneraria.EditorTools.LunePlayerBuild.BuildMac -logFile -
    /// </summary>
    public static class LunePlayerBuild
    {
        static string Root { get { return Path.GetDirectoryName(Application.dataPath); } }

        public static void BuildMac()
        {
            string path = Path.Combine(Root, "Builds/macOS/Luneraria.app");
            foreach (string copy in ConflictCopies())
            {
                Debug.Log("LUNE_BUILD removing conflict copy " + copy);
                File.Delete(copy);
            }
            // CPU and GPU frame timings for the benchmark (FrameTimingManager).
            PlayerSettings.enableFrameTimingStats = true;
            var options = new BuildPlayerOptions
            {
                scenes = new[] { LuneWorldBuilder.ScenePath },
                locationPathName = path,
                target = BuildTarget.StandaloneOSX,
                options = BuildOptions.None,
            };
            BuildReport report = BuildPipeline.BuildPlayer(options);
            Debug.Log(string.Format("LUNE_BUILD {0}: {1}, {2:0.0} MB, {3:0.0} s", report.summary.result, path, report.summary.totalSize / 1048576.0, report.summary.totalTime.TotalSeconds));
            foreach (PackedAssets packed in report.packedAssets)
            {
                ulong total = 0;
                foreach (PackedAssetInfo info in packed.contents)
                    total += info.packedSize;
                Debug.Log(string.Format("LUNE_BUILD file {0}: {1} objects, {2:0.0} MB", packed.shortPath, packed.contents.Length, total / 1048576.0));
                foreach (PackedAssetInfo info in packed.contents.OrderByDescending(c => c.packedSize).Take(5))
                    Debug.Log(string.Format("LUNE_BUILD   {0:0.00} MB {1} {2}", info.packedSize / 1048576.0, info.type, info.sourceAssetPath));
                Directory.CreateDirectory(Path.Combine(Root, "tools/out"));
                File.WriteAllLines(Path.Combine(Root, "tools/out/build-" + packed.shortPath + ".txt"),
                    packed.contents.Select(c => c.packedSize + " " + c.type + " " + c.sourceAssetPath));
            }
            string[] appeared = ConflictCopies();
            foreach (string copy in appeared)
                Debug.LogError("LUNE_BUILD conflict copy appeared during the build: " + copy);
            bool trusted = appeared.Length == 0;
            if (!trusted)
                Debug.LogError("LUNE_BUILD the build may carry stale script layouts; build again");
            EditorApplication.Exit(report.summary.result == BuildResult.Succeeded && trusted ? 0 : 1);
        }

        /// <summary>
        /// Copies a sync service (iCloud Drive) keeps of a replaced file, named "name 2.ext". In the
        /// build cache a copy of an old player assembly enters the build's type database before the
        /// current one, scripted objects are then written with the old field layout and the player
        /// reports sharedassets0.assets as corrupted. Only build caches are searched; a copy is one
        /// whose original (without " 2") exists next to it.
        /// </summary>
        static string[] ConflictCopies()
        {
            var copy = new Regex(@"^(.+) \d+(\.[^.]+)?$");
            return new[] { "Library/Bee", "Library/BuildPlayerData", "Library/PlayerDataCache" }
                .Select(folder => Path.Combine(Root, folder))
                .Where(Directory.Exists)
                .SelectMany(folder => Directory.GetFiles(folder, "* *", SearchOption.AllDirectories))
                .Where(file =>
                {
                    Match match = copy.Match(Path.GetFileName(file));
                    return match.Success && File.Exists(Path.Combine(Path.GetDirectoryName(file), match.Groups[1].Value + match.Groups[2].Value));
                })
                .OrderBy(file => file, System.StringComparer.Ordinal)
                .ToArray();
        }
    }
}