import { dbGlobal } from "drizzle-pkg/lib/db";
import { quickNotes } from "drizzle-pkg/lib/schema/content";
import { eq } from "drizzle-orm";
import { nextIntegerId } from "../../utils/sqlite-id";

export const QUICK_NOTE_MAX_LENGTH = 200000;

export function normalizeQuickNoteContent(content: string): string {
  return content.replaceAll("\r\n", "\n");
}

export function validateQuickNoteContentLength(content: string) {
  if (content.length > QUICK_NOTE_MAX_LENGTH) {
    throw createError({ statusCode: 400, statusMessage: "速记内容过长" });
  }
}

export function isQuickNoteUniqueViolation(error: unknown): boolean {
  const message = error instanceof Error ? error.message : String(error ?? "");
  if (!message.includes("UNIQUE constraint failed")) {
    return false;
  }
  return message.includes("quick_notes.user_id") || message.includes("quick_notes_user_id_unique");
}

export async function getQuickNoteByUserId(userId: number) {
  const [row] = await dbGlobal
    .select()
    .from(quickNotes)
    .where(eq(quickNotes.userId, userId))
    .limit(1);
  return row ?? null;
}

export async function upsertQuickNoteByUserId(userId: number, content: string) {
  const normalizedContent = normalizeQuickNoteContent(content);
  validateQuickNoteContentLength(normalizedContent);

  const existing = await getQuickNoteByUserId(userId);
  if (!existing) {
    try {
      const id = await nextIntegerId(quickNotes, quickNotes.id);
      await dbGlobal.insert(quickNotes).values({
        id,
        userId,
        content: normalizedContent,
      });
    } catch (error) {
      // 处理并发下“先查后插”触发的唯一键冲突：回退为 update。
      if (!isQuickNoteUniqueViolation(error)) {
        throw error;
      }
      await dbGlobal
        .update(quickNotes)
        .set({ content: normalizedContent })
        .where(eq(quickNotes.userId, userId));
    }
    const inserted = await getQuickNoteByUserId(userId);
    if (!inserted) {
      throw new Error(`速记写入失败：userId=${userId}`);
    }
    return inserted;
  }

  await dbGlobal
    .update(quickNotes)
    .set({ content: normalizedContent })
    .where(eq(quickNotes.userId, userId));
  const updated = await getQuickNoteByUserId(userId);
  if (!updated) {
    throw new Error(`速记更新失败：userId=${userId}`);
  }
  return updated;
}