import type { Project, ProjectInsertDTO, ProjectUpdateDTO } from "@workspace/schema";

export function useProjectApi() {
  const config = useRuntimeConfig();
  const apiBase = config.public.apiBaseUrl as string;
  const NOT_FOUND = -1;

  const projects = ref<Project[]>([]);
  const loading = ref(false);
  const error = ref<string | null>(null);

  async function fetchProjects(): Promise<void> {
    loading.value = true;
    error.value = null;
    try {
      projects.value = await $fetch<Project[]>(`${apiBase}/projects`);
    } catch (err) {
      error.value = err instanceof Error ? err.message : "Unknown error";
    } finally {
      loading.value = false;
    }
  }

  async function createProject(body: Partial<ProjectInsertDTO>): Promise<Project | null> {
    loading.value = true;
    error.value = null;
    try {
      const created = await $fetch<Project>(`${apiBase}/projects`, {
        method: "POST",
        body,
      });
      projects.value.push(created);
      return created;
    } catch (err) {
      error.value = err instanceof Error ? err.message : "Unknown error";
      return null;
    } finally {
      loading.value = false;
    }
  }

  async function updateProject(id: string, body: Partial<ProjectUpdateDTO>): Promise<Project | null> {
    loading.value = true;
    error.value = null;
    try {
      const updated = await $fetch<Project>(`${apiBase}/projects/${id}`, {
        method: "PATCH",
        body,
      });
      const idx = projects.value.findIndex((p) => p.id === id);
      if (idx !== NOT_FOUND) projects.value[idx] = updated;
      return updated;
    } catch (err) {
      error.value = err instanceof Error ? err.message : "Unknown error";
      return null;
    } finally {
      loading.value = false;
    }
  }

  async function deleteProject(id: string): Promise<boolean> {
    loading.value = true;
    error.value = null;
    try {
      await $fetch(`${apiBase}/projects/${id}`, { method: "DELETE" });
      projects.value = projects.value.filter((p) => p.id !== id);
      return true;
    } catch (err) {
      error.value = err instanceof Error ? err.message : "Unknown error";
      return false;
    } finally {
      loading.value = false;
    }
  }

  return { projects, loading, error, fetchProjects, createProject, updateProject, deleteProject };
}