import { Database } from "@db/sqlite";
import type { Note } from "./note.ts";

export const db = new Database(Deno.env.get("SQLITE_PATH") ?? "notes.db");
try {
  db.exec("PRAGMA journal_mode=WAL");
  db.exec("PRAGMA busy_timeout=5000");
  const [row] = db.prepare("PRAGMA journal_mode").all<{ journal_mode: string }>();
  console.log(`[db] journal_mode=${row.journal_mode}, busy_timeout=5000`);
} catch (e) {
  console.error("[db] failed to set PRAGMAs:", e);
}

type NoteRow = {
  did: string;
  rkey: string;
  title: string;
  publishedAt: string;
  createdAt: string;
};

export const getNotes = (cursor?: string, limit = 20) => {
  const notes = cursor
    ? db.prepare(
      "SELECT did, rkey, title, publishedAt, createdAt, language FROM note WHERE discoverable = 1 AND rkey < ? ORDER BY rkey DESC LIMIT ?",
    ).all<NoteRow>(cursor, limit)
    : db.prepare(
      "SELECT did, rkey, title, publishedAt, createdAt, language FROM note WHERE discoverable = 1 ORDER BY rkey DESC LIMIT ?",
    ).all<NoteRow>(limit);

  return {
    notes,
    cursor: notes.length === limit ? notes[notes.length - 1].rkey : undefined,
  };
};

export const getNotesByDid = (did: string, cursor?: string, limit = 20) => {
  const notes = cursor
    ? db.prepare(
      "SELECT did, rkey, title, publishedAt, createdAt, language FROM note WHERE discoverable = 1 AND did = ? AND rkey < ? ORDER BY rkey DESC LIMIT ?",
    ).all<NoteRow>(did, cursor, limit)
    : db.prepare(
      "SELECT did, rkey, title, publishedAt, createdAt, language FROM note WHERE discoverable = 1 AND did = ? ORDER BY rkey DESC LIMIT ?",
    ).all<NoteRow>(did, limit);

  return {
    notes,
    cursor: notes.length === limit ? notes[notes.length - 1].rkey : undefined,
  };
};

export const getNotesByDids = (dids: string[], cursor?: string, limit = 20) => {
  if (dids.length === 0) return { notes: [] };
  const placeholders = dids.map(() => "?").join(", ");
  const notes = cursor
    ? db.prepare(
      `SELECT did, rkey, title, publishedAt, createdAt, language FROM note WHERE discoverable = 1 AND did IN (${placeholders}) AND rkey < ? ORDER BY rkey DESC LIMIT ?`,
    ).all<NoteRow>(...dids, cursor, limit)
    : db.prepare(
      `SELECT did, rkey, title, publishedAt, createdAt, language FROM note WHERE discoverable = 1 AND did IN (${placeholders}) ORDER BY rkey DESC LIMIT ?`,
    ).all<NoteRow>(...dids, limit);

  return {
    notes,
    cursor: notes.length === limit ? notes[notes.length - 1].rkey : undefined,
  };
};

export const deleteNote = ({ did, rkey }: { did: string; rkey: string }) => {
  db.exec("DELETE FROM note WHERE did = ? AND rkey = ?", did, rkey);
};

export const getCursor = (): string | undefined => {
  const row = db.prepare(
    "SELECT value FROM state WHERE key = 'cursor'",
  ).get<{ value: string }>();
  return row?.value;
};

export const saveCursor = (cursor: number) => {
  db.exec(
    "INSERT OR REPLACE INTO state (key, value) VALUES ('cursor', ?)",
    String(cursor),
  );
};

type WebhookSubscriptionRow = {
  id: number;
  did: string;
  method: string;
  url: string;
};

export const addWebhookSubscription = (
  { did, method, url }: Omit<WebhookSubscriptionRow, "id">,
): WebhookSubscriptionRow => {
  db.exec(
    "INSERT INTO webhook_subscription (did, method, url) VALUES (?, ?, ?)",
    did,
    method,
    url,
  );
  return db.prepare(
    "SELECT id, did, method, url FROM webhook_subscription WHERE id = last_insert_rowid()",
  ).get<WebhookSubscriptionRow>()!;
};

export const deleteWebhooksByDid = (did: string): void => {
  db.exec("DELETE FROM webhook_subscription WHERE did = ?", did);
};

export const getWebhooksByDid = (did: string): WebhookSubscriptionRow[] => {
  return db.prepare(
    "SELECT id, did, method, url FROM webhook_subscription WHERE did = ? ORDER BY id DESC LIMIT 10",
  ).all<WebhookSubscriptionRow>(did);
};

export const upsertNote = (note: Note) => {
  const now = new Date().toISOString();
  db.exec(
    `
    INSERT INTO note (
      title,
      publishedAt,
      createdAt,
      did,
      rkey,
      discoverable,
      language
    )
    VALUES (?, ?, ?, ?, ?, ?, ?)
    ON CONFLICT(did, rkey)
    DO UPDATE SET
      title = excluded.title,
      publishedAt = excluded.publishedAt,
      discoverable = excluded.discoverable,
      language = excluded.language
    `,
    note.title,
    note.publishedAt ? new Date(note.publishedAt).toISOString() : now,
    note.createdAt ? new Date(note.createdAt).toISOString() : now,
    note.did,
    note.rkey,
    note.discoverable !== false ? 1 : 0,
    note.language,
  );
};