import type Database from 'better-sqlite3';
import { randomUUID } from 'node:crypto';
import { getDb } from './db';
import { contentSeed, seedByTag, type ContentType } from '../data/content-seed';
import { stylesToClasses } from './style-presets';

interface Entry { value: string; type: ContentType; styles: Record<string, string>; guid: string }

export function syncSeed(db: Database.Database): void {
  const ins = db.prepare('INSERT OR IGNORE INTO content_blocks (tag, type, value, guid) VALUES (?, ?, ?, ?)');
  const tx = db.transaction(() => { for (const e of contentSeed) ins.run(e.tag, e.type, e.value, randomUUID()); });
  tx();
}

export function makeContentStore(dbGetter: () => Database.Database) {
  let cache: Map<string, Entry> | null = null;

  const load = (): Map<string, Entry> => {
    if (cache) return cache;
    const rows = dbGetter().prepare('SELECT tag, type, value, styles, guid FROM content_blocks').all() as
      { tag: string; type: ContentType; value: string; styles: string; guid: string | null }[];
    cache = new Map(rows.map((r) => {
      let styles: Record<string, string> = {};
      try { styles = JSON.parse(r.styles); } catch { /* styles corrotto: si ignora */ }
      if (typeof styles !== 'object' || styles === null) styles = {};
      return [r.tag, { value: r.value, type: r.type, styles, guid: r.guid ?? '' }];
    }));
    return cache;
  };

  return {
    resolve(tag: string): { value: string; type: ContentType; classes: string; guid: string } {
      const hit = load().get(tag);
      if (hit) return { value: hit.value, type: hit.type, classes: stylesToClasses(hit.styles), guid: hit.guid };
      const seed = seedByTag.get(tag);
      if (seed) return { value: seed.value, type: seed.type, classes: '', guid: '' };
      console.warn(`[content] tag sconosciuto: ${tag}`);
      return { value: '', type: 'text', classes: '', guid: '' };
    },
    invalidate(): void { cache = null; },
  };
}

const store = makeContentStore(getDb);

export const resolveContent = (tag: string) => store.resolve(tag);
export const t = (tag: string): string => store.resolve(tag).value;
export const invalidateContentCache = (): void => store.invalidate();

export function getImageOverride(tag: string): string | null {
  const r = store.resolve(tag);
  return r.type === 'image' && r.value ? `/uploads/${r.value}` : null;
}

export const contentImageUrl = (tag: string, fallback: string): string =>
  getImageOverride(tag) ?? fallback;