using System.Collections.Generic;
using System.Linq;
using Wino.Core.Domain.Enums;
using Wino.Core.Domain.Interfaces;
using Wino.Core.Domain.Models.Folders;
using Wino.Core.Domain.Models.MailItem;
using Wino.Core.Domain.Models.Menus;

namespace Wino.Services;

public class ContextMenuItemService : IContextMenuItemService
{
    public virtual IEnumerable<FolderOperationMenuItem> GetFolderContextMenuActions(IBaseFolderMenuItem folderInformation)
    {
        var list = new List<FolderOperationMenuItem>();

        if (folderInformation.IsSticky)
            list.Add(FolderOperationMenuItem.Create(FolderOperation.Unpin));
        else
            list.Add(FolderOperationMenuItem.Create(FolderOperation.Pin));

        list.Add(FolderOperationMenuItem.Create(FolderOperation.Seperator));

        // Following 4 items are disabled for system folders.

        list.Add(FolderOperationMenuItem.Create(FolderOperation.Rename, !folderInformation.IsSystemFolder));
        list.Add(FolderOperationMenuItem.Create(FolderOperation.Delete, !folderInformation.IsSystemFolder));
        list.Add(FolderOperationMenuItem.Create(FolderOperation.CreateSubFolder, !folderInformation.IsSystemFolder));

        list.Add(FolderOperationMenuItem.Create(FolderOperation.Seperator));

        list.Add(FolderOperationMenuItem.Create(FolderOperation.Empty));

        list.Add(FolderOperationMenuItem.Create(FolderOperation.MarkAllAsRead));

        return list;
    }
    public virtual IEnumerable<MailOperationMenuItem> GetMailItemContextMenuActions(IEnumerable<IMailItem> selectedMailItems)
    {
        if (selectedMailItems == null)
            return default;

        var operationList = new List<MailOperationMenuItem>();

        // Disable archive button for Archive folder itself.

        bool isArchiveFolder = selectedMailItems.All(a => a.AssignedFolder.SpecialFolderType == SpecialFolderType.Archive);
        bool isDraftOrSent = selectedMailItems.All(a => a.AssignedFolder.SpecialFolderType == SpecialFolderType.Draft || a.AssignedFolder.SpecialFolderType == SpecialFolderType.Sent);
        bool isJunkFolder = selectedMailItems.All(a => a.AssignedFolder.SpecialFolderType == SpecialFolderType.Junk);

        bool isSingleItem = selectedMailItems.Count() == 1;

        IMailItem singleItem = selectedMailItems.FirstOrDefault();

        // Archive button.

        if (isArchiveFolder)
            operationList.Add(MailOperationMenuItem.Create(MailOperation.UnArchive));
        else
            operationList.Add(MailOperationMenuItem.Create(MailOperation.Archive));

        // Delete button.
        operationList.Add(MailOperationMenuItem.Create(MailOperation.SoftDelete));

        // Move button.
        operationList.Add(MailOperationMenuItem.Create(MailOperation.Move, !isDraftOrSent));

        // Independent flag, read etc.
        if (isSingleItem)
        {
            if (singleItem.IsFlagged)
                operationList.Add(MailOperationMenuItem.Create(MailOperation.ClearFlag));
            else
                operationList.Add(MailOperationMenuItem.Create(MailOperation.SetFlag));

            if (singleItem.IsRead)
                operationList.Add(MailOperationMenuItem.Create(MailOperation.MarkAsUnread));
            else
                operationList.Add(MailOperationMenuItem.Create(MailOperation.MarkAsRead));
        }
        else
        {
            bool isAllRead = selectedMailItems.All(a => a.IsRead);
            bool isAllUnread = selectedMailItems.All(a => !a.IsRead);
            bool isAllFlagged = selectedMailItems.All(a => a.IsFlagged);
            bool isAllNotFlagged = selectedMailItems.All(a => !a.IsFlagged);

            List<MailOperationMenuItem> readOperations = (isAllRead, isAllUnread) switch
            {
                (true, false) => [MailOperationMenuItem.Create(MailOperation.MarkAsUnread)],
                (false, true) => [MailOperationMenuItem.Create(MailOperation.MarkAsRead)],
                _ => [MailOperationMenuItem.Create(MailOperation.MarkAsRead), MailOperationMenuItem.Create(MailOperation.MarkAsUnread)]
            };
            operationList.AddRange(readOperations);

            List<MailOperationMenuItem> flagsOperations = (isAllFlagged, isAllNotFlagged) switch
            {
                (true, false) => [MailOperationMenuItem.Create(MailOperation.ClearFlag)],
                (false, true) => [MailOperationMenuItem.Create(MailOperation.SetFlag)],
                _ => [MailOperationMenuItem.Create(MailOperation.SetFlag), MailOperationMenuItem.Create(MailOperation.ClearFlag)]
            };
            operationList.AddRange(flagsOperations);
        }

        // Ignore
        if (!isDraftOrSent)
            operationList.Add(MailOperationMenuItem.Create(MailOperation.Ignore));

        // Seperator
        operationList.Add(MailOperationMenuItem.Create(MailOperation.Seperator));

        // Junk folder
        if (isJunkFolder)
            operationList.Add(MailOperationMenuItem.Create(MailOperation.MarkAsNotJunk));
        else if (!isDraftOrSent)
            operationList.Add(MailOperationMenuItem.Create(MailOperation.MoveToJunk));

        // TODO: Focus folder support.

        // Remove the separator if it's the last item remaining.
        // It's creating unpleasent UI glitch.

        if (operationList.LastOrDefault()?.Operation == MailOperation.Seperator)
            operationList.RemoveAt(operationList.Count - 1);

        return operationList;
    }
    public virtual IEnumerable<MailOperationMenuItem> GetMailItemRenderMenuActions(IMailItem mailItem, bool isDarkEditor)
    {
        var actionList = new List<MailOperationMenuItem>();

        bool isArchiveFolder = mailItem.AssignedFolder.SpecialFolderType == SpecialFolderType.Archive;

        // Add light/dark editor theme switch.
        if (isDarkEditor)
            actionList.Add(MailOperationMenuItem.Create(MailOperation.LightEditor));
        else
            actionList.Add(MailOperationMenuItem.Create(MailOperation.DarkEditor));

        actionList.Add(MailOperationMenuItem.Create(MailOperation.Seperator));

        // You can't do these to draft items.
        if (!mailItem.IsDraft)
        {
            // Reply
            actionList.Add(MailOperationMenuItem.Create(MailOperation.Reply));

            // Reply All
            actionList.Add(MailOperationMenuItem.Create(MailOperation.ReplyAll));

            // Forward
            actionList.Add(MailOperationMenuItem.Create(MailOperation.Forward));
        }

        // Archive - Unarchive
        if (isArchiveFolder)
            actionList.Add(MailOperationMenuItem.Create(MailOperation.UnArchive));
        else
            actionList.Add(MailOperationMenuItem.Create(MailOperation.Archive));

        // Delete
        actionList.Add(MailOperationMenuItem.Create(MailOperation.SoftDelete));

        // Flag - Clear Flag
        if (mailItem.IsFlagged)
            actionList.Add(MailOperationMenuItem.Create(MailOperation.ClearFlag));
        else
            actionList.Add(MailOperationMenuItem.Create(MailOperation.SetFlag));

        // Secondary items.

        // Read - Unread
        if (mailItem.IsRead)
            actionList.Add(MailOperationMenuItem.Create(MailOperation.MarkAsUnread, true, false));
        else
            actionList.Add(MailOperationMenuItem.Create(MailOperation.MarkAsRead, true, false));

        return actionList;
    }
}