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package com.github.trepo.dcap.server.rest;

import com.github.trepo.dcap.store.Query;
import com.github.trepo.dcap.store.Store;
import com.github.trepo.vgraph.Commit;
import com.google.gson.Gson;
import com.google.gson.JsonSyntaxException;

import javax.inject.Inject;
import javax.ws.rs.Consumes;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import java.util.List;

/**
 * Search for commits.
 * @author John Clark.
 */
@Path("/_search")
public class Search {

    /**
     * Gson instance for serialization/de-serialization.
     */
    private Gson gson = new Gson();

    /**
     * The commit store to use.
     */
    private Store store;

    /**
     * Search for commits.
     * @param body The query to use.
     * @return A list of commits.
     */
    @POST
    @Consumes(MediaType.APPLICATION_JSON)
    @Produces(MediaType.APPLICATION_JSON)
    public Response search(String body) {
        if (body == null) {
            throw new WebApplicationException("JSON Query body is required", Response.Status.BAD_REQUEST);
        }

        Query query;
        try {
            query = gson.fromJson(body, Query.class);
        } catch (JsonSyntaxException e) {
            throw new WebApplicationException("Invalid JSON Query Syntax", e, Response.Status.BAD_REQUEST);
        }

        List commits = store.query(query);

        return Response
                .status(Response.Status.OK)
                .entity(gson.toJson(commits))
                .build();
    }

    /**
     * Sets the Commit Store to use via Injection.
     * @param commitStore The commit store.
     */
    @Inject
    public void setStore(Store commitStore) {
        store = commitStore;
    }
}