import { getDatabase, saveDatabase } from '../db/connection.js';

export interface Store {
  id: number;
  name: string;
  slug: string;
  base_url: string;
  search_url: string;
  enabled: number;
  sel_container: string;
  sel_name: string;
  sel_price: string;
  sel_link: string;
  sel_image: string | null;
  rate_limit: number;
  rate_window: number;
  proxy_url: string | null;
  user_agent: string | null;
  headers_json: string | null;
  currency: string;
  category_id: number | null;
  created_at: string;
  updated_at: string;
}

export interface StoreWithCategory extends Store {
  category_name: string | null;
  category_color: string | null;
}

export interface CreateStoreInput {
  name: string;
  slug?: string;
  base_url: string;
  search_url: string;
  sel_container: string;
  sel_name: string;
  sel_price: string;
  sel_link: string;
  sel_image?: string;
  rate_limit?: number;
  rate_window?: number;
  proxy_url?: string;
  user_agent?: string;
  headers_json?: string;
  currency?: string;
  category_id?: number;
}

function queryAll(sql: string, params: any[] = []): any[] {
  const db = getDatabase();
  const stmt = db.prepare(sql);
  if (params.length) stmt.bind(params);
  const rows: any[] = [];
  while (stmt.step()) {
    rows.push(stmt.getAsObject());
  }
  stmt.free();
  return rows;
}

function queryOne(sql: string, params: any[] = []): any | undefined {
  const rows = queryAll(sql, params);
  return rows[0];
}

function slugify(text: string): string {
  return text
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, '-')
    .replace(/^-|-$/g, '');
}

export function getAllStores(): StoreWithCategory[] {
  return queryAll(`
    SELECT s.*, c.name as category_name, c.color as category_color
    FROM stores s
    LEFT JOIN categories c ON s.category_id = c.id
    ORDER BY s.name
  `);
}

export function getStoreById(id: number): StoreWithCategory | undefined {
  return queryOne(`
    SELECT s.*, c.name as category_name, c.color as category_color
    FROM stores s
    LEFT JOIN categories c ON s.category_id = c.id
    WHERE s.id = ?
  `, [id]);
}

export function getEnabledStores(): Store[] {
  return queryAll('SELECT * FROM stores WHERE enabled = 1 ORDER BY name');
}

export function getStoresByCategory(categoryId: number): Store[] {
  return queryAll('SELECT * FROM stores WHERE enabled = 1 AND category_id = ? ORDER BY name', [categoryId]);
}

export function getStoresByGroup(groupId: number): Store[] {
  return queryAll(`
    SELECT s.* FROM stores s
    JOIN store_group_members sgm ON s.id = sgm.store_id
    WHERE s.enabled = 1 AND sgm.group_id = ?
    ORDER BY s.name
  `, [groupId]);
}

export function getStoresByIds(ids: number[]): Store[] {
  if (ids.length === 0) return [];
  const placeholders = ids.map(() => '?').join(',');
  return queryAll(`SELECT * FROM stores WHERE enabled = 1 AND id IN (${placeholders}) ORDER BY name`, ids);
}

export function createStore(input: CreateStoreInput): Store {
  const db = getDatabase();
  const slug = input.slug || slugify(input.name);

  db.run(`
    INSERT INTO stores (name, slug, base_url, search_url, sel_container, sel_name, sel_price, sel_link, sel_image,
      rate_limit, rate_window, proxy_url, user_agent, headers_json, currency, category_id)
    VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
  `, [
    input.name, slug, input.base_url, input.search_url,
    input.sel_container, input.sel_name, input.sel_price, input.sel_link, input.sel_image || null,
    input.rate_limit ?? 2, input.rate_window ?? 1000,
    input.proxy_url || null, input.user_agent || null, input.headers_json || null,
    input.currency || 'EUR', input.category_id || null,
  ]);

  const lastId = queryOne('SELECT last_insert_rowid() as id')?.id;
  saveDatabase();
  return getStoreById(lastId) as Store;
}

export function updateStore(id: number, input: Partial<CreateStoreInput>): Store | undefined {
  const existing = getStoreById(id);
  if (!existing) return undefined;

  const db = getDatabase();
  const fields: string[] = [];
  const values: any[] = [];

  for (const [key, value] of Object.entries(input)) {
    if (value !== undefined) {
      fields.push(`${key} = ?`);
      values.push(value);
    }
  }

  if (fields.length === 0) return existing;

  fields.push("updated_at = datetime('now')");
  values.push(id);

  db.run(`UPDATE stores SET ${fields.join(', ')} WHERE id = ?`, values);
  saveDatabase();
  return getStoreById(id);
}

export function toggleStoreEnabled(id: number): Store | undefined {
  const db = getDatabase();
  db.run("UPDATE stores SET enabled = CASE WHEN enabled = 1 THEN 0 ELSE 1 END, updated_at = datetime('now') WHERE id = ?", [id]);
  saveDatabase();
  return getStoreById(id);
}

export function deleteStore(id: number): boolean {
  const db = getDatabase();
  db.run('DELETE FROM stores WHERE id = ?', [id]);
  const changes = db.getRowsModified();
  if (changes > 0) saveDatabase();
  return changes > 0;
}