import "server-only";
import path from "node:path";
import { rawDb } from "@/lib/db/client";

export interface ManualSubtitle {
  code: string;
  partIdx: number;
  absPath: string;
  attachedAt: number;
}

interface ManualSubtitleRow {
  code: string;
  part_idx: number;
  abs_path: string;
  attached_at: number;
}

function rowToEntry(r: ManualSubtitleRow): ManualSubtitle {
  return { code: r.code, partIdx: r.part_idx, absPath: r.abs_path, attachedAt: r.attached_at };
}

export function listManualSubtitlesForVariant(code: string, partIdx: number): ManualSubtitle[] {
  const rows = rawDb.prepare(`
    SELECT code, part_idx, abs_path, attached_at FROM manual_subtitles
    WHERE code = ? AND part_idx = ?
    ORDER BY attached_at DESC
  `).all(code, partIdx) as ManualSubtitleRow[];
  return rows.map(rowToEntry);
}

/** True iff this exact abs path is recorded against any (code, part). */
export function isManualSubtitlePath(abs: string): boolean {
  const resolved = path.resolve(abs);
  // Windows paths are case-insensitive on disk but stored as-typed.
  // Compare with a case-insensitive LIKE on Windows, exact on POSIX.
  if (process.platform === "win32") {
    const row = rawDb.prepare(`
      SELECT 1 FROM manual_subtitles WHERE LOWER(abs_path) = LOWER(?) LIMIT 1
    `).get(resolved);
    return !!row;
  }
  const row = rawDb.prepare(`SELECT 1 FROM manual_subtitles WHERE abs_path = ? LIMIT 1`).get(resolved);
  return !!row;
}

export function attachManualSubtitle(code: string, partIdx: number, absPath: string): void {
  rawDb.prepare(`
    INSERT OR REPLACE INTO manual_subtitles (code, part_idx, abs_path, attached_at)
    VALUES (?, ?, ?, ?)
  `).run(code, partIdx, path.resolve(absPath), Date.now());
}

export function detachManualSubtitle(code: string, partIdx: number, absPath: string): void {
  rawDb.prepare(`
    DELETE FROM manual_subtitles WHERE code = ? AND part_idx = ? AND abs_path = ?
  `).run(code, partIdx, path.resolve(absPath));
}