using Flow.Launcher.Plugin.BrowserBookmark.Models;
using System.Collections.Generic;
using System.IO;
using System.Text.Json;
using Flow.Launcher.Infrastructure.Logger;

namespace Flow.Launcher.Plugin.BrowserBookmark;

public abstract class ChromiumBookmarkLoader : IBookmarkLoader
{
    public abstract List<Bookmark> GetBookmarks();

    protected List<Bookmark> LoadBookmarks(string browserDataPath, string name)
    {
        var bookmarks = new List<Bookmark>();
        if (!Directory.Exists(browserDataPath)) return bookmarks;
        var paths = Directory.GetDirectories(browserDataPath);

        foreach (var profile in paths)
        {
            var bookmarkPath = Path.Combine(profile, "Bookmarks");
            if (!File.Exists(bookmarkPath))
                continue;

            Main.RegisterBookmarkFile(bookmarkPath);

            var source = name + (Path.GetFileName(profile) == "Default" ? "" : $" ({Path.GetFileName(profile)})");
            bookmarks.AddRange(LoadBookmarksFromFile(bookmarkPath, source));
        }

        return bookmarks;
    }

    protected List<Bookmark> LoadBookmarksFromFile(string path, string source)
    {
        var bookmarks = new List<Bookmark>();

        if (!File.Exists(path))
            return bookmarks;

        using var jsonDocument = JsonDocument.Parse(File.ReadAllText(path));
        if (!jsonDocument.RootElement.TryGetProperty("roots", out var rootElement))
            return bookmarks;
        EnumerateRoot(rootElement, bookmarks, source);
        return bookmarks;
    }

    private void EnumerateRoot(JsonElement rootElement, ICollection<Bookmark> bookmarks, string source)
    {
        foreach (var folder in rootElement.EnumerateObject())
        {
            if (folder.Value.ValueKind != JsonValueKind.Object)
                continue;

            // Fix for Opera. It stores bookmarks slightly different than chrome. See PR and bug report for this change for details.
            // If various exceptions start to build up here consider splitting this Loader into multiple separate ones.
            if (folder.Name == "custom_root")
                EnumerateRoot(folder.Value, bookmarks, source);
            else
                EnumerateFolderBookmark(folder.Value, bookmarks, source);
        }
    }

    private void EnumerateFolderBookmark(JsonElement folderElement, ICollection<Bookmark> bookmarks,
        string source)
    {
        if (!folderElement.TryGetProperty("children", out var childrenElement))
            return;
        foreach (var subElement in childrenElement.EnumerateArray())
        {
            if (subElement.TryGetProperty("type", out var type))
            {
                switch (type.GetString())
                {
                    case "folder":
                    case "workspace": // Edge Workspace
                        EnumerateFolderBookmark(subElement, bookmarks, source);
                        break;
                    default:
                        bookmarks.Add(new Bookmark(
                            subElement.GetProperty("name").GetString(),
                            subElement.GetProperty("url").GetString(),
                            source));
                        break;
                }
            }
            else
            {
                Log.Error(
                    $"ChromiumBookmarkLoader: EnumerateFolderBookmark: type property not found for {subElement.GetString()}");
            }
        }
    }
}