import { eq } from 'drizzle-orm';
import { db } from 'officerdb/db';
import { encryptSecret, decryptSecret } from 'officerdb/crypto';
import { karakeepConfig, karakeepAccounts } from './schema';

// Karakeep store access. Callers deal in PLAINTEXT — encryption to and from at-rest ciphertext happens
// here, so neither the proxy nor the provisioner touches crypto directly. The key purpose is
// `karakeep`, minted on first use by the secret store (docs/secret-store.md).

// ── Instance configuration (server-wide, one row) ──

export type KarakeepConfig = { url: string | null; enabled: boolean; updatedAt: Date | null };

const EMPTY_CONFIG: KarakeepConfig = { url: null, enabled: true, updatedAt: null };

/**
 * Where this install's Karakeep is, or `url: null` when the owner has not pointed it anywhere yet.
 *
 * Never throws and never creates the row. A missing row and an unset URL are the same answer to the only
 * question anyone asks here, and an install nobody has configured is an ordinary state rather than an
 * error. The admin token is deliberately NOT returned — see `getAdminApiKey`.
 */
export async function getKarakeepConfig(): Promise<KarakeepConfig> {
  const [row] = await db.select().from(karakeepConfig).where(eq(karakeepConfig.id, 1));
  if (!row) return EMPTY_CONFIG;
  return { url: row.url, enabled: row.enabled, updatedAt: row.updatedAt };
}

/** Trailing slash removed on write, so `${url}/api/v1/...` can never double the separator. */
const normaliseUrl = (raw: string): string => raw.trim().replace(/\/+$/, '');

/**
 * Point this install at a Karakeep, or change which one.
 *
 * The URL is stored as given (normalised) and NOT probed. Reachability is a separate question with its
 * own route, and a setter that refused an unreachable address would make configuring an instance that is
 * temporarily down impossible.
 */
export async function setKarakeepConfig(patch: {
  url?: string | null;
  enabled?: boolean;
  adminApiKey?: string | null;
}): Promise<KarakeepConfig> {
  const values = {
    id: 1,
    ...(patch.url !== undefined ? { url: patch.url === null ? null : normaliseUrl(patch.url) } : {}),
    ...(patch.enabled !== undefined ? { enabled: patch.enabled } : {}),
    ...(patch.adminApiKey !== undefined
      ? { adminApiKey: patch.adminApiKey === null ? null : await encryptSecret('karakeep', patch.adminApiKey) }
      : {}),
    updatedAt: new Date(),
  };

  await db
    .insert(karakeepConfig)
    .values(values)
    .onConflictDoUpdate({ target: karakeepConfig.id, set: values });

  return getKarakeepConfig();
}

/**
 * The admin token, decrypted. Read by provisioning and by nothing else.
 *
 * Separate from `getKarakeepConfig` on purpose: that one is handed to the settings panel and to the
 * sidecar, and neither has any business holding a credential that can create accounts. A single function
 * that returned everything would make the careful thing the one you have to remember to do.
 */
export async function getAdminApiKey(): Promise<string | null> {
  const [row] = await db.select().from(karakeepConfig).where(eq(karakeepConfig.id, 1));
  if (!row?.adminApiKey) return null;
  return decryptSecret('karakeep', row.adminApiKey);
}

// ── Account mapping (one row per Officer user) ──

export type KarakeepAccount = {
  userId: number;
  karakeepUserId: string;
  email: string;
  /** Null when an account exists but no key has been minted for it yet. A real state, not an error. */
  apiKey: string | null;
  apiKeyId: string | null;
};

/** Who this Officer user is on Karakeep, or null when nobody has mapped them. */
export async function getAccount(userId: number): Promise<KarakeepAccount | null> {
  const [row] = await db.select().from(karakeepAccounts).where(eq(karakeepAccounts.userId, userId));
  if (!row) return null;
  return {
    userId: row.userId,
    karakeepUserId: row.karakeepUserId,
    email: row.email,
    apiKey: row.apiKey ? await decryptSecret('karakeep', row.apiKey) : null,
    apiKeyId: row.apiKeyId,
  };
}

/** Every mapping, for the owner's account screen. Keys are NOT included — only whether one exists. */
export async function listAccounts(): Promise<
  { userId: number; karakeepUserId: string; email: string; hasKey: boolean }[]
> {
  const rows = await db.select().from(karakeepAccounts);
  return rows.map((row) => ({
    userId: row.userId,
    karakeepUserId: row.karakeepUserId,
    email: row.email,
    hasKey: !!row.apiKey,
  }));
}

/** Map an Officer user onto a Karakeep account, or replace the mapping. Upsert on `userId`. */
export async function setAccount(account: {
  userId: number;
  karakeepUserId: string;
  email: string;
  apiKey?: string | null;
  apiKeyId?: string | null;
}): Promise<void> {
  const values = {
    userId: account.userId,
    karakeepUserId: account.karakeepUserId,
    email: account.email,
    ...(account.apiKey !== undefined
      ? { apiKey: account.apiKey === null ? null : await encryptSecret('karakeep', account.apiKey) }
      : {}),
    ...(account.apiKeyId !== undefined ? { apiKeyId: account.apiKeyId } : {}),
    updatedAt: new Date(),
  };

  await db.insert(karakeepAccounts).values(values).onConflictDoUpdate({ target: karakeepAccounts.userId, set: values });
}

/**
 * Forget the mapping. Does NOT delete the Karakeep account.
 *
 * Deliberate: Officer created it but does not own what is in it, and a person removed from an Officer
 * install should not silently lose a library of saved reading. Deleting it there is a separate act, done
 * by somebody who means it.
 */
export async function forgetAccount(userId: number): Promise<boolean> {
  const rows = await db
    .delete(karakeepAccounts)
    .where(eq(karakeepAccounts.userId, userId))
    .returning({ userId: karakeepAccounts.userId });
  return rows.length > 0;
}