"use server";
import { revalidatePath } from "next/cache";
import path from "node:path";
import fs from "node:fs/promises";
import { rawDb } from "@/lib/db/client";
import { safeJoin } from "@/lib/safePath";

export type CategoryCoverSlot = "portrait" | "landscape";

const COVER_ROOT = path.join(process.cwd(), "data", "category-covers");

const SLOT_COLS: Record<CategoryCoverSlot, { path: string; zoom: string; ox: string; oy: string }> = {
  portrait:  { path: "cover_portrait_path",  zoom: "cover_portrait_zoom",  ox: "cover_portrait_offset_x",  oy: "cover_portrait_offset_y" },
  landscape: { path: "cover_landscape_path", zoom: "cover_landscape_zoom", ox: "cover_landscape_offset_x", oy: "cover_landscape_offset_y" },
};

export async function setCategoryCoverTransform(
  categoryId: number,
  slot: CategoryCoverSlot,
  transform: { zoom: number; offsetX: number; offsetY: number },
) {
  const c = SLOT_COLS[slot];
  if (!c) return;
  const zoom = Math.max(0.5, Math.min(5, transform.zoom));
  rawDb.prepare(`
    UPDATE tag_categories SET ${c.zoom} = ?, ${c.ox} = ?, ${c.oy} = ? WHERE id = ?
  `).run(zoom, transform.offsetX, transform.offsetY, categoryId);
  const row = rawDb.prepare(`SELECT slug FROM tag_categories WHERE id = ?`).get(categoryId) as { slug: string } | undefined;
  revalidatePath("/category");
  if (row) revalidatePath(`/category/${row.slug}`);
}

export async function clearCategoryCover(categoryId: number, slot: CategoryCoverSlot) {
  const c = SLOT_COLS[slot];
  if (!c) return;
  const row = rawDb.prepare(`SELECT slug, ${c.path} AS p FROM tag_categories WHERE id = ?`).get(categoryId) as
    | { slug: string; p: string | null }
    | undefined;
  if (!row) return;
  if (row.p) {
    const abs = safeJoin(COVER_ROOT, row.p);
    if (abs) await fs.rm(abs, { force: true }).catch(() => {});
  }
  rawDb.prepare(`
    UPDATE tag_categories SET ${c.path} = NULL, ${c.zoom} = 1, ${c.ox} = 0, ${c.oy} = 0 WHERE id = ?
  `).run(categoryId);
  revalidatePath("/category");
  revalidatePath(`/category/${row.slug}`);
}