using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using MimeKit;
using Wino.Core.Domain.Entities;
using Wino.Core.Domain.Models.MailItem;

namespace Wino.Core.Domain.Interfaces
{
    public interface IMailService
    {
        Task<MailCopy> GetSingleMailItemAsync(string mailCopyId, string remoteFolderId);
        Task<MailCopy> GetSingleMailItemAsync(Guid uniqueMailId);
        Task<MailCopy> CreateDraftAsync(MailAccount composerAccount, MimeMessage generatedReplyMime, MimeMessage replyingMimeMessage = null, IMailItem replyingMailItem = null);
        Task<List<IMailItem>> FetchMailsAsync(MailListInitializationOptions options);

        Task<List<string>> GetMailIdsByFolderIdAsync(Guid folderId);

        // v2

        /// <summary>
        /// Deletes all mail copies for all folders.
        /// </summary>
        /// <param name="accountId">Account to remove from</param>
        /// <param name="mailCopyId">Mail copy id to remove.</param>
        Task DeleteMailAsync(Guid accountId, string mailCopyId);

        Task ChangeReadStatusAsync(string mailCopyId, bool isRead);
        Task ChangeFlagStatusAsync(string mailCopyId, bool isFlagged);

        Task CreateAssignmentAsync(Guid accountId, string mailCopyId, string remoteFolderId);
        Task DeleteAssignmentAsync(Guid accountId, string mailCopyId, string remoteFolderId);

        Task<bool> CreateMailAsync(Guid accountId, NewMailItemPackage package);

        /// <summary>
        /// Maps new mail item with the existing local draft copy.
        /// In case of failure, it returns false.
        /// Then synchronizers must insert a new mail item.
        /// </summary>
        /// <param name="accountId">Id of the account. It's important to map to the account since if the user use the same account with different providers, this call must map the correct one.</param>
        /// <param name="localDraftCopyUniqueId">UniqueId of the local draft copy.</param>
        /// <param name="newMailCopyId">New assigned remote mail item id.</param>
        /// <param name="newDraftId">New assigned draft id if exists.</param>
        /// <param name="newThreadId">New message's thread/conversation id.</param>
        /// <returns>True if mapping is done. False if local copy doesn't exists.</returns>
        Task<bool> MapLocalDraftAsync(Guid accountId, Guid localDraftCopyUniqueId, string newMailCopyId, string newDraftId, string newThreadId);

        /// <summary>
        /// Maps new mail item with the existing local draft copy.
        /// 
        /// </summary>
        /// <param name="newMailCopyId"></param>
        /// <param name="newDraftId"></param>
        /// <param name="newThreadId"></param>
        Task MapLocalDraftAsync(string newMailCopyId, string newDraftId, string newThreadId);

        Task<MimeMessage> CreateDraftMimeMessageAsync(Guid accountId, DraftCreationOptions options);
        Task UpdateMailAsync(MailCopy mailCopy);

        /// <summary>
        /// Gets the new inserted unread mails after the synchronization.
        /// </summary>
        /// <param name="accountId">Account id.</param>
        /// <param name="downloadedMailCopyIds">
        /// Mail ids that synchronizer tried to download. If there was an issue with the
        /// Items that tried and actually downloaded may differ. This function will return only new inserted ones.
        /// </param>
        /// <returns>Newly inserted unread mails inside the Inbox folder.</returns>
        Task<List<MailCopy>> GetDownloadedUnreadMailsAsync(Guid accountId, IEnumerable<string> downloadedMailCopyIds);

        /// <summary>
        /// Returns the account that this mail copy unique id is assigned.
        /// Used in toast notification handler.
        /// </summary>
        /// <param name="uniqueMailId">Unique id of the mail item.</param>
        /// <returns>Account that mail belongs to.</returns>
        Task<MailAccount> GetMailAccountByUniqueIdAsync(Guid uniqueMailId);

        /// <summary>
        /// Checks whether the given mail copy id exists in the database.
        /// Safely used for Outlook to prevent downloading the same mail twice.
        /// For Gmail, it should be avoided since one mail may belong to multiple folders.
        /// </summary>
        /// <param name="mailCopyId">Native mail id of the message.</param>
        Task<bool> IsMailExistsAsync(string mailCopyId);
    }
}