using System.Collections.Generic;
using UnityEditor;

namespace AlicizaX.PackageManager.Editor
{
    internal static class UpdateAllPackageHelper
    {
        private static readonly Queue<RepositoryPackageData> PackagesToUpdate = new Queue<RepositoryPackageData>();
        private static FrameworkPackageManagerWindow s_window;
        private static int s_totalCount;
        private static int s_currentIndex;

        public static void UpdatePackages(FrameworkPackageManagerWindow window)
        {
            if (window == null)
            {
                return;
            }

            if (PackageOperationRunner.IsBusy)
            {
                EditorUtility.DisplayDialog("更新包", "当前有其他包操作正在执行。", "确定");
                return;
            }

            var updatablePackages = CollectUpdatablePackages(window.RepositoryPackageDatas);
            if (updatablePackages.Count == 0)
            {
                EditorUtility.DisplayDialog("更新包", "当前没有可更新的包。", "确定");
                return;
            }

            var confirm = EditorUtility.DisplayDialog(
                "更新包提示",
                $"检测到 {updatablePackages.Count} 个包可更新，是否继续？\n更新完成后建议重新打开 Unity。",
                "是",
                "否");

            if (!confirm)
            {
                return;
            }

            s_window = window;
            PackagesToUpdate.Clear();
            foreach (var package in updatablePackages)
            {
                PackagesToUpdate.Enqueue(package);
            }

            s_totalCount = PackagesToUpdate.Count;
            s_currentIndex = 0;
            UpdateNextPackage();
        }

        public static void UpdatePackage(FrameworkPackageManagerWindow window, RepositoryPackageData package)
        {
            if (window == null || package == null)
            {
                return;
            }

            if (PackageOperationRunner.IsBusy)
            {
                EditorUtility.DisplayDialog("更新包", "当前有其他包操作正在执行。", "确定");
                return;
            }

            if (package.PackageState != PackageState.Update)
            {
                EditorUtility.DisplayDialog("更新包", "当前包没有检测到远端更新。", "确定");
                return;
            }

            s_window = window;
            PackagesToUpdate.Clear();
            PackagesToUpdate.Enqueue(package);
            s_totalCount = 1;
            s_currentIndex = 0;
            UpdateNextPackage();
        }

        private static List<RepositoryPackageData> CollectUpdatablePackages(List<RepositoryPackageData> repositoryPackageDatas)
        {
            var result = new List<RepositoryPackageData>();
            if (repositoryPackageDatas == null)
            {
                return result;
            }

            foreach (var package in repositoryPackageDatas)
            {
                if (package == null || package.PackageState != PackageState.Update)
                {
                    continue;
                }

                if (string.IsNullOrEmpty(package.cloneUrl))
                {
                    continue;
                }

                result.Add(package);
            }

            return result;
        }

        private static void UpdateNextPackage()
        {
            if (PackagesToUpdate.Count == 0)
            {
                EditorUtility.ClearProgressBar();
                s_window?.Refresh();
                return;
            }

            s_currentIndex++;
            var package = PackagesToUpdate.Dequeue();
            var canceled = EditorUtility.DisplayCancelableProgressBar(
                "正在更新包",
                $"{s_currentIndex}/{s_totalCount} {package.name}",
                (float)s_currentIndex / s_totalCount);

            if (canceled)
            {
                PackagesToUpdate.Clear();
                EditorUtility.ClearProgressBar();
                return;
            }

            PackageManagerCheckTool.UpdatePackage(package, (success, _) =>
            {
                if (!success)
                {
                    EditorUtility.ClearProgressBar();
                    return;
                }

                UpdateNextPackage();
            });
        }
    }
}