import marked from 'marked';
import {Vue, Component, Prop, Watch} from 'vue-property-decorator';
import {FileData} from '@/interfaces/FileData';

@Component
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!: [];


    /**
     * 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]: string } = {};

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

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

    /**
     *
     */
    created() {
        this.intervalId = setInterval(this.waitForFile, 3000);
    }

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

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

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

    /**
     * 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.searchersDialogVisible;
        }
    }

    /**
     * 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> {

        this.$confirm.require({
            message: 'You will lose any progress on the current uploaded document. Are you sure you want to proceed?',
            header: 'Confirmation',
            icon: 'pi pi-exclamation-triangle',
            accept: () => {
                this.fileContent = this.processedFileContent = '';
                let file = event.files[0];
                this.toggleUploadDialog(false);
                this.$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.content !== null) {

            if (response.ingest_status === 'fail') {
                this.$toast.add({
                    severity: 'error',
                    summary: 'File error',
                    detail: 'THere was an error processing the file in ingest',
                    life: 3000
                });
            } else {
                this.fileContent = response.content;

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

                clearInterval(this.intervalId);
            }
        }
    }

    /**
     *
     * @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; replace_with: string; }> = [];

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

        const response = await this.$api.filterDocument(this.fileContent, searchers);

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

        this.processing = false;
    }

    /**
     * Create the diff preview for the document
     */
    private createDiffPreview() {
        console.log('CREATING DIFF PREVIEW: ', this.processedFileContent);
        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 response = await this.$api.convertFile(this.processedFileContent);

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

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