"use server";

import { revalidatePath } from "next/cache";

import { prisma } from "@/lib/db";
import { requireUserId } from "@/lib/auth-helpers";
import { projectAccessFilter } from "@/lib/access";
import { ProjectTitleSchema, ProjectThemeSchema } from "@/lib/validation/project";
import type { ProjectDTO } from "@/types/project";

export async function createProject(title: string): Promise<ProjectDTO> {
  const userId = await requireUserId();
  const parsedTitle = ProjectTitleSchema.parse(title);

  const project = await prisma.project.create({
    data: { title: parsedTitle, ownerId: userId },
  });

  revalidatePath("/projects");
  return { id: project.id, title: project.title, theme: null };
}

/**
 * Assigns a theme to a project (or clears it back to "Default Theme" with
 * null, which follows the user's global theme preference). Only the
 * project's own page is themed -- see components/theme/project-theme-scope.tsx.
 */
export async function setProjectTheme(
  projectId: string,
  theme: string | null
): Promise<void> {
  const userId = await requireUserId();
  const parsed = ProjectThemeSchema.parse(theme);

  const { count } = await prisma.project.updateMany({
    where: { id: projectId, ...projectAccessFilter(userId) },
    data: { theme: parsed },
  });
  if (count === 0) throw new Error("Project not found");

  revalidatePath("/projects");
  revalidatePath(`/projects/${projectId}`);
}

export async function renameProject(projectId: string, title: string): Promise<void> {
  const userId = await requireUserId();
  const parsedTitle = ProjectTitleSchema.parse(title);

  const { count } = await prisma.project.updateMany({
    where: { id: projectId, ...projectAccessFilter(userId) },
    data: { title: parsedTitle },
  });
  if (count === 0) throw new Error("Project not found");

  revalidatePath("/projects");
  revalidatePath(`/projects/${projectId}`);
}

export type DeleteProjectResult = { error?: string };

/**
 * Deletes a project and everything in it -- its categories, groups, and
 * to-dos all cascade away with it (unlike deleting a single Category,
 * which refuses if it still has groups). The confirmation dialog on the
 * client carries the "this can't be undone" warning; this action doesn't
 * re-check emptiness.
 */
export async function deleteProject(projectId: string): Promise<DeleteProjectResult> {
  const userId = await requireUserId();

  const { count } = await prisma.project.deleteMany({
    where: { id: projectId, ...projectAccessFilter(userId) },
  });
  if (count === 0) return { error: "Project not found." };

  revalidatePath("/projects");
  return {};
}