import {Vue, Component, Prop, Watch} from 'vue-property-decorator';
import {FileData} from '@/interfaces/FileData';
import { eventBus } from '@/app';
import DefineSearcher from '../Searchers/DefineSearcher.vue';
import RadioButton from "primevue/radiobutton";
import {isServerError} from "@/SearchDisplace/helpers";

@Component({
    components: {
        RadioButton,
        DefineSearcher,
    },
})
export default class ProcessFile extends Vue {

    /**
     * Props
     */
    // The data for the file we are processing
    @Prop({default: {id: -1, file: '', path: ''}})
    public readonly file!: FileData;

    // The list of available searchers
    @Prop({default: []})
    public readonly searchers!: [];

    @Prop({default: null})
    public readonly document!: File | null;

    /**
     * Class members
     */
        // The id of the interval used to query the file status
    private intervalId!: any;

    // The content of the file we are processing
    private fileContent: string = '';

    // The processed document content
    private processedFileContent: string = '';

    private processedFileContentPreview: string = '';

    private documentDiffIndexes: { [key: string]: Array<{ start: number; end: number; }>; } = {};

    // Flag to determine whether the text is processing or not
    private processing: boolean = false;

    // Toggles the visibility of the selected searchers sidebar
    private searchersSidebarVisible: boolean = false;

    // Toggles the visibility of the available searchers dialog
    private searchersDialogVisible: boolean = false;

    // Toggles the visibility of the document upload dialog
    private uploadDialogVisible: boolean = false;

    // The list of filters/searchers in a format usable by the datatable
    // private searchersData: Array<{ id: string; name: string; type: string; }> = [];

    // The list of filters applied to the selected searchers
    private searchersFilters: any = {};

    // The list of selected filters/searchers
    private selectedSearchers: any = {};

    //The list of expanded rows in the selected filters/searchers table
    private expandedRows: Array<any> = [];

    // The list of options applied to the searchers (for the moment, only replace_with)
    private searchersOptions: { [key: string]: { type: string, value: string, } } = {};

    // Flag to determine whether or not we will show the diff highlights
    private showDiffHighlight: boolean = false;

    private newlySelectedSearchers: Array<{ id: string; name: string; }> = [];

    private showDefineSearcher: boolean = false;

    private searcherToDefineText: string = '';

    private applyingOnOriginalDocument: boolean = false;

    /**
     *
     */
    created() {
        let storedSearchers = localStorage.getItem('searchers');
        if (storedSearchers !== null) {
            this.selectedSearchers = JSON.parse(storedSearchers);
            localStorage.removeItem('searchers');

            let searchersOptions = localStorage.getItem('searchersOptions');
            if (searchersOptions !== null) {
                this.searchersOptions = JSON.parse(searchersOptions);
                localStorage.removeItem('searchersOptions');
            }
        }

        this.intervalId = setInterval(this.waitForFile, 3000);

        window.addEventListener('onbeforeunload', async (event) => {
            // Cancel the event as stated by the standard.
            event.preventDefault();

            const response = await this.$api.discardFile(this.file.id);

            return event;
        });

        eventBus.$on('changeRoute', this.changeRoute);
    }

    /**
     * HTML compiled file content
     */
    get compiledFileContent(): string {
        return this.fileContent;
    }

    /**
     * HTML compiled processed file content
     */
    get compiledProcessedFileContent(): string {
        return this.processedFileContent;
    }

    /**
     * MD-to-HTML compiled processed file content with diff highlight
     */
    get compiledProcessedFileContentPreview(): string {
        return this.processedFileContentPreview;
    }

    public changeRoute(url: string) {
        const el = document.body;
        setTimeout(() => {
            el.classList.remove('p-overflow-hidden');
        }, 10);
        this.$confirm.require({
            message: 'You will lose any progress on the current uploaded document. Are you sure you want to proceed?',
            header: 'Confirmation',
            icon: 'pi pi-exclamation-triangle',
            blockScroll: false,
            accept: () => {
                window.location.href = url;
                this.$api.discardFile(this.file.id);
            },
            reject: () => {
                // TODO: Show a message to the user that the action was cancelled.
            }
        });
    }

    /**
     * Toggle the sidebar containing the searchers
     */
    private toggleSearchersSidebar() {
        this.searchersSidebarVisible = !this.searchersSidebarVisible;
    }

    /**
     * Toggle the menu containing the list of available searchers
     *
     * @param {string}  newValue    The new value for the dialog visibility
     */
    private toggleSearchersDialog(newValue?: boolean) {
        if (typeof newValue !== 'undefined') {
            this.searchersDialogVisible = newValue;
        } else {
            this.searchersDialogVisible = !this.searchersDialogVisible;
        }

        if ( ! this.searchersDialogVisible) {
            for (let selectedSearcher of this.newlySelectedSearchers) {
                // this.selectedSearchers[selectedSearcher.id] = selectedSearcher;
                this.$set(this.selectedSearchers, selectedSearcher.id, selectedSearcher);

                this.expandedRows = Object.values(this.selectedSearchers).filter((p: any) => p.id);
            }

            this.newlySelectedSearchers = [];
        }
    }


    /**
     * Toggle the dialog which lets the user upload a new document
     *
     * @param {boolean} newValue
     */
    toggleUploadDialog(newValue?: boolean) {
        if (typeof newValue !== 'undefined') {
            this.uploadDialogVisible = newValue;
        } else {
            this.uploadDialogVisible = !this.uploadDialogVisible;
        }
    }

    /**
     * A method which uploads the files to the server for processing
     *
     * @param event The event containing the uploaded files information
     */
    public async uploadFile(event: any): Promise<void> {
        localStorage.setItem('searchers', JSON.stringify(this.selectedSearchers));
        localStorage.setItem('searchersOptions', JSON.stringify(this.searchersOptions));
        this.toggleUploadDialog(false);

        this.$confirm.require({
            message: 'You will lose any progress on the current uploaded document. Are you sure you want to proceed?',
            header: 'Confirmation',
            icon: 'pi pi-exclamation-triangle',
            accept: () => {
                this.fileContent = this.processedFileContent = '';
                let file = event.files[0];
                this.toggleUploadDialog(false);
                this.$api.discardFile(this.file.id);
                this.$emit('newFile', file);
            },
            reject: () => {
                // TODO: Show a message to the user that the action was cancelled.
            }
        });
    }

    /**
     * Wait for the file to be processed in ingest
     */
    private async waitForFile() {
        const response = await this.$api.getFileData(this.file.id);

        if (response.status === 'processing') {
            return;
        }

        clearInterval(this.intervalId);

        if (response.status === 'success') {
            this.fileContent = response.content ? response.content : '';

            this.$toast.add({
                severity: 'success',
                summary: 'File loaded',
                detail: 'The file has been processed by ingest.',
                life: 3000
            });
        }

        if (response.status === 'fail') {
            const error = 'There was an error processing the file in ingest';

            this.$toast.add({
                severity: 'error',
                summary: 'File error',
                detail: error,
                life: 3000
            });

            this.$emit('error', error);
        }
    }

    private async verifySdOnOriginalDocumentIsDone(id: string) {
        const response = await this.$api.verifySdOnOriginalDocumentIsDone(id);

        if (response.status === 'processing') {
            return;
        }

        clearInterval(this.intervalId);

        if (response.status === 'fail') {
            this.$toast.add({
                severity: 'error',
                summary: 'Something went wrong.',
                detail: 'Document could not have been processed.',
                life: 7000,
            });

            this.applyingOnOriginalDocument = false;

            return;
        }

        this.$toast.add({
            severity: 'success',
            summary: 'File loaded',
            detail: 'The file has been processed by ingest.',
            life: 7000,
        });

        this.downloadFinishedOriginalDocument(id);

        this.applyingOnOriginalDocument = false;

        // @TODO Send request to backend to delete file if no other way..
    }

    private downloadFinishedOriginalDocument(id: string) {
        const url = `${window.location.origin}/search-and-displace/original-document/${id}/download`;

        const link = window.document.createElement('a');
        link.setAttribute('download', 'Document.doxc');
        link.href = url;
        window.document.body.appendChild(link);
        link.click();
        link.remove();
    }

    /**
     *
     * @param $event
     */
    private onSelectedSearchersReorder($event: any) {
        Object.assign({}, this.selectedSearchers, $event.value);
    }

    private confirmDeleteProduct(searcher: any) {
        this.$delete(this.selectedSearchers, searcher.id);
    }

    /**
     * Run the searchers
     */
    private async runSearchers() {
        this.processing = true;
        this.processedFileContent = '';

        let searchers: Array<{ key: string; type: string; value: string; }> = [];

        Object.values(this.selectedSearchers).forEach((searcher: any) => {
            searchers.push({
                key: searcher.id,
                type: this.searchersOptions[searcher.id].type,
                value: this.searchersOptions[searcher.id].value || '',
            });
        });

        try {
            const response = await this.$api.filterDocument(this.file.id, searchers);

            this.processedFileContent = response.content;
            this.documentDiffIndexes = response.indexes;
            this.createDiffPreview();

            this.processing = false;
        } catch (e) {
            this.$emit('error', 'Server error.');

            // if (isServerError(e)) {
            //     this.$emit('error', getServerErrorMessage(e));
            // }
        }
    }

    private async runSearchersWithoutDisplacing() {
        this.processing = true;

        let searchers: Array<{ key: string; type: string; value: string; }> = [];

        Object.values(this.selectedSearchers).forEach((searcher: any) => {
            searchers.push({
                key: searcher.id,
                type: this.searchersOptions[searcher.id].type,
                value: this.searchersOptions[searcher.id].value || ''
            });
        });

        try {
            const response = await this.$api.filterDocument(this.file.id, searchers, true);

            this.processedFileContent = response.content;
            // this.documentDiffIndexes = response;
            this.createDiffPreview();

            this.processing = false;
        } catch (e) {
            this.$emit('error', 'Server error.');

            // if (isServerError(e)) {
            //     this.$emit('error', getServerErrorMessage(e));
            // }
        }
    }

    /**
     * Create the diff preview for the document
     */
    private createDiffPreview() {
        this.processedFileContentPreview = this.processedFileContent;

        let indexes: Array<{ start: number; end: number }> = [];

        for (let searcher in this.documentDiffIndexes) {
            const searcherIndexes = this.documentDiffIndexes[searcher];

            searcherIndexes.forEach(index => {
                indexes.push(index);
            });
        }

        indexes.sort((a, b) => {
            return b.start - a.start;
        });

        this.processedFileContentPreview = indexes.reduce(
            (r, a) => {
                r[a.start] = '<mark>' + r[a.start];
                r[a.end] += '</mark>';
                return r;
            },
            this.processedFileContent.split('')
        ).join('');
    }

    /**
     * Download the document in ODT format
     */
    private async downloadOdt() {
        let searchers: Array<{ key: string; type: string; value: string; }> = [];

        Object.values(this.selectedSearchers).forEach((searcher: any) => {
            searchers.push({
                key: searcher.id,
                type: this.searchersOptions[searcher.id].type,
                value: this.searchersOptions[searcher.id].value || '',
            });
        });

        let response = await this.$api.convertFile({id: this.file.id, name: this.file.file_name || 'filename.odt'}, searchers);

        window.open(`${window.location.origin}/file/download/` + response.path);
    }

    private async downloadOriginal() {
        if ( ! this.document) {
            return;
        }

        this.applyingOnOriginalDocument = true;

        this.$toast.add({
            severity: 'info',
            summary: 'Processing...',
            detail: 'This operation may take a while..',
            life: 7000,
        });

        let searchers: Array<{ key: string; type: string; value: string; }> = [];

        Object.values(this.selectedSearchers).forEach((searcher: any) => {
            searchers.push({
                key: searcher.id,
                type: this.searchersOptions[searcher.id].type,
                value: this.searchersOptions[searcher.id].value || '',
            });
        });

        try {
            const data = await this.$api.sdOnOriginalDocument(this.document, searchers);

            this.intervalId = setInterval(() => {
                this.verifySdOnOriginalDocumentIsDone(data.id);
            }, 5000);
        } catch (e) {
            this.applyingOnOriginalDocument = false;

            if (isServerError(e)) {
                if (e.response.data.hasOwnProperty('errors')) {
                    const errors = e.response.data.errors;

                    if (errors.hasOwnProperty('file')) {
                        this.$toast.add({
                            severity: 'error',
                            summary: errors.file[0],
                            detail: 'There was an error processing your file. Please try again later.',
                            life: 7000,
                        });

                        return;
                    }
                }

                if (e.response.data.hasOwnProperty('message')) {
                    this.$toast.add({
                        severity: 'error',
                        summary: e.response.data.message,
                        detail: 'There was an error processing your file. Please try again later.',
                        life: 7000,
                    });

                    return;
                }
            }

            this.$toast.add({
                severity: 'error',
                summary: 'Something went wrong.',
                detail: 'There was an error processing your file. Please try again later.',
                life: 7000,
            });
        }
    }

    private canRunSearchers(): boolean {
        if (this.fileContent == '' || Object.keys(this.selectedSearchers).length === 0) {
            return false;
        }

        for (let key of Object.keys(this.selectedSearchers)) {
            const searcher = this.selectedSearchers[key];

            if (!this.isValidParam(searcher.id, searcher.param)) {
                return false;
            }
        }

        return true;
    }

    /**
     * Check if a param is valid or not.
     *
     * @param {string} paramId
     * @param {string} paramType
     * @returns {boolean}
     */
    private isValidParam(paramId: string, paramType: string): boolean {
        if (
            paramType === 'required' &&
            (Object.keys(this.searchersOptions[paramId]).length === 0 || this.searchersOptions[paramId] === undefined)
        ) {
            return false;
        }
        return true;
    }

    private onDefineSearcher(): void {
        const selection = window.getSelection();
        const selectedText = selection ? selection.toString() : '';

        if ( ! selectedText) {
            this.$toast.add({
                severity: 'info',
                summary: 'No text selected.',
                detail: 'You need to select some text in order to define a new searcher.',
                life: 6000,
            });

            return;
        }

        this.showDefineSearcher = true;
        this.searcherToDefineText = selectedText;
    }

    private onAddNewSearcher(): void {
        this.showDefineSearcher = true;
        this.searcherToDefineText = '';
    }

    private onSearcherDefined(definedSearcher: Object): void {
        this.$toast.add({
            severity: 'success',
            summary: 'Searcher defined.',
            detail: 'You can use this newly defined searcher right away.',
            life: 6000,
        });

        this.$emit('newSearcher', definedSearcher);

        this.showDefineSearcher = false;
    }

    /**
     * Watch the filters for any changes. When the search value is empty, remove it
     * This is needed due to a bug in PrimeVue where the pagination doesn't work when there is a active filter
     *
     * @param newValue
     * @param oldValue
     */
    @Watch('searchersFilters', { deep: true })
    private onFiltersChanged(newValue: any, oldValue: object): void {
        if (newValue.global === '') {
            this.searchersFilters = {};
        }
    }

    /**
     * Watch the `showDiffHighlight` property for changes
     *
     * @param {boolean} newValue
     * @param {boolean} oldValue
     */
    @Watch('showDiffHighlight')
    private onDiffHighlightChanged(newValue: boolean, oldValue: boolean): void {
        //
    }

    @Watch('selectedSearchers', { deep: true, })
    private onSelectedSearchersChanged(): void {
        const selectedIds = Object.keys(this.selectedSearchers);
        const optionsIds = Object.keys(this.searchersOptions);

        selectedIds.forEach((selectedId) => {
            if (optionsIds.includes(selectedId)) {
                return;
            }

            this.$set(this.searchersOptions, selectedId, {
                type: this.selectedSearchers[selectedId].tag ? 'displace' : 'replace',
                value: this.selectedSearchers[selectedId].tag ? this.selectedSearchers[selectedId].tag : '',
            });
        });

        optionsIds.forEach((optionId) => {
            if (selectedIds.includes(optionId)) {
                return;
            }

            this.$delete(this.selectedSearchers, optionId);
        });
    }
}