import {FontAwesomeIcon} from "@fortawesome/react-fontawesome";
import {faCloud, faCloudArrowDown, faCloudArrowUp, faSpinner} from "@fortawesome/free-solid-svg-icons";
import {useTranslations} from "next-intl";
import {useState, useContext} from "react";
import OfflineContext, {OfflineContextType} from "@/context/OfflineContext";
import System from "@/lib/models/System";
import {SessionContext, SessionContextProps} from "@/context/SessionContext";
import {LangContext} from "@/context/LangContext";
import {CompleteBook} from "@/lib/models/Book";
import {BooksSyncContext, BooksSyncContextProps, SyncType} from "@/context/BooksSyncContext";
import {AlertContext, AlertContextProps} from "@/context/AlertContext";
import {BookSyncCompare} from "@/lib/models/SyncedBook";

interface SyncBookProps {
    bookId: string;
    status: SyncType;
}

export default function SyncBook({bookId, status}: SyncBookProps) {
    const t = useTranslations();
    const {session} = useContext<SessionContextProps>(SessionContext);
    const {lang} = useContext(LangContext);
    const {errorMessage} = useContext<AlertContextProps>(AlertContext);
    const {isCurrentlyOffline} = useContext<OfflineContextType>(OfflineContext);
    const [isLoading, setIsLoading] = useState<boolean>(false);
    const [currentStatus, setCurrentStatus] = useState<SyncType>(status);
    const {booksToSyncToServer, booksToSyncFromServer} = useContext<BooksSyncContextProps>(BooksSyncContext)

    const isOffline: boolean = isCurrentlyOffline();

    async function upload(): Promise<void> {
        // TODO: Implement upload local-only book to server
    }

    async function download(): Promise<void> {
        try {
            const response: CompleteBook = await System.authGetQueryToServer('book/sync/download', session.accessToken, lang, {bookId});
            if (!response) {
                errorMessage(t("bookCard.downloadError"));
                return;
            }
            const syncStatus:boolean = await window.electron.invoke<boolean>('db:book:syncSave', response);
            if (!syncStatus) {
                errorMessage(t("bookCard.downloadError"));
                return;
            }
            setCurrentStatus('synced');
        } catch (e:unknown) {
            if (e instanceof Error) {
                errorMessage(e.message);
            } else {
                errorMessage(t("bookCard.downloadError"));
            }
        }
    }

    async function syncFromServer(): Promise<void> {
        if (isOffline) {
            return;
        }
        try {
            const bookToFetch:BookSyncCompare|undefined = booksToSyncFromServer.find((book:BookSyncCompare):boolean => book.id === bookId);
            if (!bookToFetch) {
                errorMessage(t("bookCard.syncFromServerError"));
                return;
            }
            const response: CompleteBook = await System.authPostToServer('book/sync/server-to-client', {
                bookToSync: bookToFetch
            }, session.accessToken, lang);
            if (!response) {
                errorMessage(t("bookCard.syncFromServerError"));
                return;
            }
            const syncStatus:boolean = await window.electron.invoke<boolean>('db:book:sync:toClient', response);
            if (!syncStatus) {
                errorMessage(t("bookCard.syncFromServerError"));
                return;
            }
            setCurrentStatus('synced');
        } catch (e:unknown) {
            if (e instanceof Error) {
                errorMessage(e.message);
            } else {
                errorMessage(t("bookCard.syncFromServerError"));
            }
        }
    }

    async function syncToServer(): Promise<void> {
        if (isOffline) {
            return;
        }
        try {
            const bookToFetch:BookSyncCompare|undefined = booksToSyncToServer.find((book:BookSyncCompare):boolean => book.id === bookId);
            if (!bookToFetch) {
                errorMessage(t("bookCard.syncToServerError"));
                return;
            }
            const bookToSync: CompleteBook = await window.electron.invoke<CompleteBook>('db:book:sync:toServer', bookToFetch);
            if (!bookToSync) {
                errorMessage(t("bookCard.syncToServerError"));
                return;
            }
            const response: boolean = await System.authPutToServer('book/sync/client-to-server', {
                book: bookToSync
            }, session.accessToken, lang);
            if (!response) {
                errorMessage(t("bookCard.syncToServerError"));
                return;
            }
            setCurrentStatus('synced');
        } catch (e:unknown) {
            if (e instanceof Error) {
                errorMessage(e.message);
            } else {
                errorMessage(t("bookCard.syncToServerError"));
            }
        }
    }

    if (isLoading) {
        return (
            <div className="flex items-center gap-2">
                <span className="text-primary">
                    <FontAwesomeIcon icon={faSpinner} className="w-4 h-4 animate-spin"/>
                </span>
            </div>
        );
    }

    return (
        <div className="flex items-center gap-2">
            {/* Fully synced - no action needed */}
            {currentStatus === 'synced' && (
                <span
                    className="text-gray-light"
                    title={t("bookCard.synced")}
                >
                    <FontAwesomeIcon icon={faCloud} className="w-4 h-4"/>
                </span>
            )}

            {/* Local only - can upload to server */}
            {currentStatus === 'local-only' && (
                <button
                    onClick={upload}
                    className={`transition-colors ${isOffline ? 'text-gray-dark cursor-not-allowed' : 'text-gray hover:text-primary cursor-pointer'}`}
                    title={t("bookCard.localOnly")}
                    type="button"
                    disabled={isOffline}
                >
                    <FontAwesomeIcon icon={faCloudArrowUp} className="w-4 h-4"/>
                </button>
            )}

            {/* Server only - can download to local */}
            {currentStatus === 'server-only' && (
                <button
                    onClick={download}
                    className={`transition-colors ${isOffline ? 'text-gray-dark cursor-not-allowed' : 'text-gray hover:text-primary cursor-pointer'}`}
                    title={t("bookCard.serverOnly")}
                    type="button"
                    disabled={isOffline}
                >
                    <FontAwesomeIcon icon={faCloudArrowDown} className="w-4 h-4"/>
                </button>
            )}

            {/* Needs to sync from server (server has newer version) */}
            {currentStatus === 'to-sync-from-server' && (
                <button
                    onClick={syncFromServer}
                    className={`transition-colors ${isOffline ? 'text-gray-dark cursor-not-allowed' : 'text-warning hover:text-primary cursor-pointer'}`}
                    title={t("bookCard.toSyncFromServer")}
                    type="button"
                    disabled={isOffline}
                >
                    <FontAwesomeIcon icon={faCloudArrowDown} className="w-4 h-4"/>
                </button>
            )}

            {/* Needs to sync to server (local has newer version) */}
            {currentStatus === 'to-sync-to-server' && (
                <button
                    onClick={syncToServer}
                    className={`transition-colors ${isOffline ? 'text-gray-dark cursor-not-allowed' : 'text-warning hover:text-primary cursor-pointer'}`}
                    title={t("bookCard.toSyncToServer")}
                    type="button"
                    disabled={isOffline}
                >
                    <FontAwesomeIcon icon={faCloudArrowUp} className="w-4 h-4"/>
                </button>
            )}
        </div>
    );
}
