import * as rp from 'request-promise';
import { Database } from './database';
import { thisExpression } from 'babel-types';

export class Search {
    public static Instance = new Search();
    private url = 'http://localhost:8983/solr/';

    public async updateDocument(document: any) {
        try {
            const res = await rp.post(this.url + "dash/update", {
                headers: { 'content-type': 'application/json' },
                body: JSON.stringify([document])
            });
            return res;
        } catch (e) {
            // console.warn("Search error: " + e + document);
        }
    }

    public async updateDocuments(documents: any[]) {
        try {
            const res = await rp.post(this.url + "dash/update", {
                headers: { 'content-type': 'application/json' },
                body: JSON.stringify(documents)
            });
            return res;
        } catch (e) {
            // console.warn("Search error: ", e, documents);
        }
    }

    public async search(query: any) {
        try {
            const searchResults = JSON.parse(await rp.get(this.url + "dash/select", {
                qs: query
            }));
            const { docs, numFound } = searchResults.response;
            const ids = docs.map((field: any) => field.id);
            return { ids, numFound, highlighting: searchResults.highlighting };
        } catch {
            return { ids: [], numFound: -1 };
        }
    }

    public async clear() {
        try {
            return await rp.post(this.url + "dash/update", {
                body: {
                    delete: {
                        query: "*:*"
                    }
                },
                json: true
            });
        } catch { }
    }

    public deleteDocuments(docs: string[]) {
        const promises: rp.RequestPromise[] = [];
        const nToDelete = 1000;
        let index = 0;
        while (index < docs.length) {
            const count = Math.min(docs.length - index, nToDelete);
            const deleteIds = docs.slice(index, index + count);
            index += count;
            promises.push(rp.post(this.url + "dash/update", {
                body: {
                    delete: {
                        query: deleteIds.map(id => `id:"${id}"`).join(" ")
                    }
                },
                json: true
            }));
        }

        return Promise.all(promises);
    }
}