using UnityEditor;
using UnityEngine;
using UnityEngine.UIElements;

namespace AlicizaX.PackageManager.Editor
{
    internal class PackageInfoView : VisualElement
    {
        private readonly FrameworkPackageManagerWindow window;

        private VisualElement mainContainer;
        private Label displayNameLabel;
        private Label versionLabel;
        private Label authorLabel;
        private Label packageNameLabel;
        private Label descriptionLabel;
        private Label sourceLinkLabel;
        private Label installedStateLabel;

        private Button updateButton;
        private Button installButton;
        private Button removeButton;

        private RepositoryPackageData selectedPackage;

        public PackageInfoView(FrameworkPackageManagerWindow window)
        {
            this.window = window;

            style.flexShrink = 1;
            style.height = Length.Percent(100);

            mainContainer = new VisualElement { name = "MainContainer" };
            mainContainer.style.flexShrink = 1;
            mainContainer.style.height = Length.Percent(100);
            mainContainer.style.paddingLeft = 10;
            mainContainer.style.paddingTop = 10;

            displayNameLabel = CreateLabel("DisplayName", 19, FontStyle.Bold);
            versionLabel = CreateLabel("VersionWithDate", 13, FontStyle.Bold);
            authorLabel = CreateLabel("AuthorLabel", 12, FontStyle.Italic);
            packageNameLabel = CreateLabel("PackageName", 12, FontStyle.Italic);
            installedStateLabel = CreateLabel("InstalledState", 12, FontStyle.Normal);
            descriptionLabel = CreateLabel("ProjectDescription", 12, FontStyle.Normal);

            sourceLinkLabel = CreateLabel("BtnLink", 12, FontStyle.Normal);
            sourceLinkLabel.text = "Source Code";
            sourceLinkLabel.style.color = new Color(0.2980392f, 0.498f, 1f);
            sourceLinkLabel.RegisterCallback<ClickEvent>(OnSourceClick);

            var buttonContainer = new VisualElement { name = "PackageBtnContainer" };
            buttonContainer.style.flexDirection = FlexDirection.Row;
            buttonContainer.style.paddingTop = 10;

            installButton = CreateButton("BtnInstall", "Install", OnInstallClick);
            updateButton = CreateButton("BtnUpdate", "Update", OnUpdateClick);
            removeButton = CreateButton("BtnRemove", "Remove", OnRemoveClick);

            buttonContainer.Add(installButton);
            buttonContainer.Add(updateButton);
            buttonContainer.Add(removeButton);

            mainContainer.Add(displayNameLabel);
            mainContainer.Add(versionLabel);
            mainContainer.Add(authorLabel);
            mainContainer.Add(packageNameLabel);
            mainContainer.Add(installedStateLabel);
            mainContainer.Add(descriptionLabel);
            mainContainer.Add(sourceLinkLabel);
            mainContainer.Add(buttonContainer);

            Add(mainContainer);
            RefreshView(null);
        }

        public void RefreshView(RepositoryPackageData repositoryPackageData)
        {
            selectedPackage = repositoryPackageData;
            if (repositoryPackageData == null)
            {
                mainContainer.visible = false;
                return;
            }

            mainContainer.visible = true;
            displayNameLabel.text = string.IsNullOrEmpty(repositoryPackageData.displayName)
                ? repositoryPackageData.name
                : repositoryPackageData.displayName;
            versionLabel.text = $"Remote: {repositoryPackageData.version}  HEAD: {ShortHash(repositoryPackageData.remoteHead)}";
            authorLabel.text = $"Author: {repositoryPackageData.authorName}";
            packageNameLabel.text = repositoryPackageData.name;
            installedStateLabel.text = BuildInstalledState(repositoryPackageData);
            descriptionLabel.text = string.IsNullOrEmpty(repositoryPackageData.packageDescription)
                ? "Description: N/A"
                : repositoryPackageData.packageDescription;

            installButton.style.display = repositoryPackageData.PackageState == PackageState.UnInstall ? DisplayStyle.Flex : DisplayStyle.None;
            updateButton.style.display = repositoryPackageData.PackageState == PackageState.Update ? DisplayStyle.Flex : DisplayStyle.None;
            removeButton.style.display = repositoryPackageData.PackageState == PackageState.Install || repositoryPackageData.PackageState == PackageState.Update
                ? DisplayStyle.Flex
                : DisplayStyle.None;
        }

        private void OnSourceClick(ClickEvent evt)
        {
            if (selectedPackage == null || string.IsNullOrEmpty(selectedPackage.htmlUrl))
            {
                return;
            }

            Application.OpenURL(selectedPackage.htmlUrl);
        }

        private void OnInstallClick()
        {
            if (selectedPackage == null)
            {
                return;
            }

            PackageManagerCheckTool.InstallPackage(selectedPackage.cloneUrl, (success, _) =>
            {
                if (success)
                {
                    window.Refresh();
                }
            });
        }

        private void OnUpdateClick()
        {
            if (selectedPackage == null)
            {
                return;
            }

            UpdateAllPackageHelper.UpdatePackage(window, selectedPackage);
        }

        private void OnRemoveClick()
        {
            if (selectedPackage == null)
            {
                return;
            }

            var confirm = EditorUtility.DisplayDialog("Remove Package", $"Remove {selectedPackage.name}?", "Yes", "No");
            if (!confirm)
            {
                return;
            }

            PackageManagerCheckTool.UninstallPackage(selectedPackage.name, (success, _) =>
            {
                if (success)
                {
                    window.Refresh();
                }
            });
        }

        private static Label CreateLabel(string name, int fontSize, FontStyle fontStyle)
        {
            var label = new Label { name = name };
            label.style.fontSize = fontSize;
            label.style.unityFontStyleAndWeight = fontStyle;
            label.style.paddingTop = 5;
            return label;
        }

        private static Button CreateButton(string name, string text, System.Action clickAction)
        {
            var button = new Button(clickAction) { name = name, text = text };
            button.style.width = 90;
            button.style.height = 24;
            button.style.marginLeft = 0;
            button.style.marginRight = 4;
            return button;
        }

        private static string BuildInstalledState(RepositoryPackageData package)
        {
            var installedVersion = string.IsNullOrEmpty(package.InstalledVersion) ? "N/A" : package.InstalledVersion;
            var installedHash = string.IsNullOrEmpty(package.InstalledHash) ? "N/A" : ShortHash(package.InstalledHash);
            var source = string.IsNullOrEmpty(package.InstalledSource) ? "None" : package.InstalledSource;
            return $"Installed: {installedVersion}  Source: {source}  Local HEAD: {installedHash}";
        }

        private static string ShortHash(string hash)
        {
            if (string.IsNullOrEmpty(hash))
            {
                return "N/A";
            }

            return hash.Length <= 8 ? hash : hash.Substring(0, 8);
        }
    }
}