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

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

import javax.inject.Inject;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;

/**
 * Get a commit.
 * @author John Clark.
 */
@Path("/{commit}")
public class Get {

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

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

    /**
     * Get a commit.
     * @param commitId The id of the commit to get.
     * @return The commit, or 404.
     */
    @GET
    @Produces(MediaType.APPLICATION_JSON)
    public Response get(@PathParam("commit") String commitId) {

        Commit commit = store.get(commitId);

        if (commit == null) {
            throw new WebApplicationException("Commit not Found", Response.Status.NOT_FOUND);
        }
        return Response
                .status(Response.Status.OK)
                .entity(gson.toJson(commit))
                .build();
    }

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