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package ca.ibodrov.mica.server.api;

import ca.ibodrov.mica.api.kinds.MicaDashboardV1;
import ca.ibodrov.mica.api.kinds.MicaDashboardV1.TableLayout;
import ca.ibodrov.mica.api.model.EntityId;
import ca.ibodrov.mica.api.model.RenderRequest;
import ca.ibodrov.mica.server.data.BuiltinSchemas;
import ca.ibodrov.mica.server.data.EntityStore;
import ca.ibodrov.mica.server.data.JsonPathEvaluator;
import ca.ibodrov.mica.server.data.ViewController;
import ca.ibodrov.mica.server.data.ViewRenderer.RenderOverrides;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.node.NullNode;
import com.walmartlabs.concord.server.sdk.rest.Resource;

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 java.util.List;

import static java.util.Objects.requireNonNull;
import static javax.ws.rs.core.MediaType.APPLICATION_JSON;

@Path("/api/mica/v1/dashboard")
@Produces(APPLICATION_JSON)
public class DashboardResource implements Resource {

    private final EntityStore entityStore;
    private final ViewController viewController;
    private final JsonPathEvaluator jsonPathEvaluator;

    @Inject
    public DashboardResource(EntityStore entityStore,
                             ViewController viewController,
                             JsonPathEvaluator jsonPathEvaluator) {
        this.entityStore = requireNonNull(entityStore);
        this.viewController = requireNonNull(viewController);
        this.jsonPathEvaluator = requireNonNull(jsonPathEvaluator);
    }

    @GET
    @Path("{entityId}")
    public DashboardRenderResponse render(@PathParam("entityId") EntityId entityId) {
        var dashboardEntity = entityStore.getById(entityId)
                .orElseThrow(() -> new IllegalArgumentException("Dashboard not found (entityId=" + entityId + ")"));
        var dashboard = BuiltinSchemas.asMicaDashboardV1(dashboardEntity);

        var table = dashboard.table()
                .orElseThrow(() -> new IllegalArgumentException("Non-table layouts are not supported yet."));

        var request = toRenderRequest(dashboard);
        var renderedView = viewController.getCachedOrRender(request, RenderOverrides.none());

        var data = renderedView.data().stream()
                .map(row -> parseRow(dashboardEntity.name(), row, table))
                .toList();
        return new DashboardRenderResponse(dashboard, data);
    }

    private List parseRow(String entityName, JsonNode row, TableLayout table) {
        return table.columns().stream()
                .map(col -> jsonPathEvaluator.apply(entityName, row, col.jsonPath())
                        .orElse(NullNode.getInstance()))
                .toList();
    }

    public record DashboardRenderResponse(MicaDashboardV1 dashboard, List> data) {
    }

    private static RenderRequest toRenderRequest(MicaDashboardV1 dashboard) {
        var viewRef = dashboard.view();
        return RenderRequest.parameterized(viewRef.name(), viewRef.parameters().orElse(null));
    }
}