import { supaBrowser as supabase } from "shared/api/supabase";
import { CourseModule } from "shared/domain/course";
import { Term } from "shared/domain/term";

export async function fetchCourse(courseid: number): Promise<CourseModule | null> {
    const { data, error } = await supabase
        .schema("library")
        .from("mv_course_with_module") // TODO: MAke a better view
        .select("*")
        .eq("course_id", courseid)
        .single();

    if (error) throw error;

    return data as CourseModule;
}

export async function fetchCoursesModules(term: Term): Promise<CourseModule[]> {
    const { data, error } = await supabase
        .schema("library")
        .from("mv_course_with_module") // TODO: MAke a better view
        .select("*")
        .eq("semester_id", term.semester_id)

    const { data: favs, error: favsError } = await supabase
        .schema("library")
        .from("module_favorites")
        .select("module_id, user_uuid")
        .eq("user_uuid", (await supabase.auth.getUser()).data.user?.id);

    if (!favsError) {
        return data!.map((courseModule) => {
            const is_user_favorite = favs.some(
                (fav) => fav.module_id === courseModule.module_id
            );
            return { ...courseModule, is_user_favorite };
        }) as CourseModule[];
    }

    if (error) throw error;

    return data as CourseModule[];
}

/**
 * Toggle the “favorite” flag for the current user.
 * Returns true if the RPC says the row is now a favorite.
 */
export async function toggleCourseFavorite(
    courseModule: CourseModule,
    isfavorite: boolean,
): Promise<boolean> {

    const { data, error } = await supabase
        .schema("library")
        .rpc("upsert_module_favorites", {
            p_favorite_state: isfavorite,
            p_module_id: courseModule.module_id,
        });

    if (error) throw error;

    return data === "true";
}