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* Base exception for all BCCR-related errors\n */\nexport class BCCRError extends Error {\n constructor(message: string) {\n super(message);\n this.name = 'BCCRError';\n // Maintains proper stack trace for where our error was thrown (only available on V8)\n if (Error.captureStackTrace) {\n Error.captureStackTrace(this, this.constructor);\n }\n }\n}\n\n/**\n * Raised when scraping the BCCR website fails\n */\nexport class BCCRScrapingError extends BCCRError {\n constructor(message: string) {\n super(message);\n this.name = 'BCCRScrapingError';\n }\n}\n\n/**\n * Raised when date validation or parsing fails\n */\nexport class BCCRDateError extends BCCRError {\n constructor(message: string) {\n super(message);\n this.name = 'BCCRDateError';\n }\n}\n\n/**\n * Raised when connection to BCCR website fails\n */\nexport class BCCRConnectionError extends BCCRError {\n constructor(message: string) {\n super(message);\n this.name = 'BCCRConnectionError';\n }\n}\n\n/**\n * Raised when parsing HTML response fails\n */\nexport class BCCRParseError extends BCCRError {\n constructor(message: string) {\n super(message);\n this.name = 'BCCRParseError';\n }\n}\n","import dayjs from 'dayjs';\nimport customParseFormat from 'dayjs/plugin/customParseFormat.js';\nimport utc from 'dayjs/plugin/utc.js';\nimport timezone from 'dayjs/plugin/timezone.js';\nimport { BCCRDateError } from './exceptions';\n\n// Enable plugins\ndayjs.extend(customParseFormat);\ndayjs.extend(utc);\ndayjs.extend(timezone);\n\n/**\n * Spanish month names mapping\n */\nconst SPANISH_MONTHS: Record = {\n enero: 1,\n febrero: 2,\n marzo: 3,\n abril: 4,\n mayo: 5,\n junio: 6,\n julio: 7,\n agosto: 8,\n septiembre: 9,\n octubre: 10,\n noviembre: 11,\n diciembre: 12,\n};\n\n/**\n * Parses Spanish date string to ISO format\n * @param dateStr - Spanish date string (e.g., \"lunes, 4 de noviembre de 2025\")\n * @returns ISO date string (YYYY-MM-DD)\n * @throws {BCCRDateError} If date parsing fails\n */\nexport function parseSpanishDate(dateStr: string): string {\n try {\n // Remove day of week if present (e.g., \"lunes, \")\n let cleanDate = dateStr.replace(/^[a-záéíóúñ]+,\\s*/i, '');\n\n // Extract day, month, and year using regex\n // Pattern: \"4 de noviembre de 2025\"\n const pattern = /(\\d{1,2})\\s+de\\s+([a-záéíóúñ]+)\\s+de\\s+(\\d{4})/i;\n const match = cleanDate.match(pattern);\n\n if (!match) {\n throw new Error(`Could not parse date format: ${dateStr}`);\n }\n\n const day = parseInt(match[1], 10);\n const monthName = match[2].toLowerCase();\n const year = parseInt(match[3], 10);\n\n const month = SPANISH_MONTHS[monthName];\n if (!month) {\n throw new Error(`Unknown Spanish month: ${monthName}`);\n }\n\n // Validate day range before creating date\n if (day < 1 || day > 31) {\n throw new Error(`Invalid day: ${day} (must be between 1 and 31)`);\n }\n\n // Create date and validate\n const date = dayjs(`${year}-${month.toString().padStart(2, '0')}-${day.toString().padStart(2, '0')}`);\n\n if (!date.isValid()) {\n throw new Error(`Invalid date values: day=${day}, month=${month}, year=${year}`);\n }\n\n // Additional validation: check if the created date matches input values\n // This catches cases like February 30th which dayjs might silently correct\n if (date.date() !== day || date.month() + 1 !== month || date.year() !== year) {\n throw new Error(`Invalid date: ${day}/${month}/${year} (date does not exist in calendar)`);\n }\n\n return date.format('YYYY-MM-DD');\n } catch (error) {\n throw new BCCRDateError(\n `Failed to parse Spanish date \"${dateStr}\": ${error instanceof Error ? error.message : String(error)}`\n );\n }\n}\n\n/**\n * Formats date object to Spanish date format (DD/MM/YYYY) for BCCR\n * @param date - Date object or ISO string\n * @returns Formatted date string (DD/MM/YYYY)\n */\nexport function formatSpanishDate(date: Date | string): string {\n const d = dayjs(date);\n if (!d.isValid()) {\n throw new BCCRDateError(`Invalid date: ${date}`);\n }\n return d.format('DD/MM/YYYY');\n}\n\n/**\n * Parses BCCR timestamp string to ISO format\n * @param timestampStr - Timestamp string (e.g., \"04/11/2025 10:30:00 a.m.\" or \"04/11/2025 10:30 a.m.\")\n * @returns ISO timestamp string\n */\nexport function formatLastUpdate(timestampStr: string): string {\n try {\n // Clean up the string\n let cleaned = timestampStr.trim();\n\n // Replace Spanish AM/PM indicators with standard format\n // Handle variations: \"a.m.\", \"a. m.\", \"p.m.\", \"p. m.\"\n cleaned = cleaned.replace(/\\s*a\\.\\s*m\\./i, ' AM').replace(/\\s*p\\.\\s*m\\./i, ' PM');\n\n // Normalize multiple spaces to single space (handles extra whitespace from HTML)\n cleaned = cleaned.replace(/\\s+/g, ' ');\n\n // Try parsing with seconds first: \"DD/MM/YYYY hh:mm:ss A\"\n // Parse in Costa Rica timezone (UTC-6) since BCCR times are local\n let parsed = dayjs.tz(cleaned, 'DD/MM/YYYY hh:mm:ss A', 'America/Costa_Rica');\n\n if (!parsed.isValid()) {\n // Try without seconds: \"DD/MM/YYYY hh:mm A\"\n parsed = dayjs.tz(cleaned, 'DD/MM/YYYY hh:mm A', 'America/Costa_Rica');\n }\n\n if (!parsed.isValid()) {\n // Try without time\n const dateOnly = dayjs.tz(cleaned.split(' ')[0], 'DD/MM/YYYY', 'America/Costa_Rica');\n if (dateOnly.isValid()) {\n return dateOnly.toISOString();\n }\n throw new Error('Invalid timestamp format');\n }\n\n return parsed.toISOString();\n } catch (error) {\n // Return original string if parsing fails\n return timestampStr;\n }\n}\n\n/**\n * Validates date parameter\n * @param dateStr - Date string in YYYY-MM-DD or DD/MM/YYYY format\n * @returns Validated date object\n * @throws {BCCRDateError} If date is invalid\n */\nexport function validateDateParameter(dateStr: string): dayjs.Dayjs {\n let date: dayjs.Dayjs;\n\n // Try ISO format first (YYYY-MM-DD)\n date = dayjs(dateStr, 'YYYY-MM-DD', true);\n\n if (!date.isValid()) {\n // Try DD/MM/YYYY format (with leading zeros)\n date = dayjs(dateStr, 'DD/MM/YYYY', true);\n }\n\n if (!date.isValid()) {\n // Try D/M/YYYY format (without leading zeros)\n date = dayjs(dateStr, 'D/M/YYYY', true);\n }\n\n if (!date.isValid()) {\n // Try DD/M/YYYY format (day with leading zero, month without)\n date = dayjs(dateStr, 'DD/M/YYYY', true);\n }\n\n if (!date.isValid()) {\n // Try D/MM/YYYY format (day without leading zero, month with)\n date = dayjs(dateStr, 'D/MM/YYYY', true);\n }\n\n if (!date.isValid()) {\n throw new BCCRDateError(\n `Invalid date format: ${dateStr}. Expected YYYY-MM-DD or DD/MM/YYYY`\n );\n }\n\n return date;\n}\n\n/**\n * Validates that date is within acceptable range\n * @param dateStr - Date string\n * @param maxDaysBack - Maximum number of days back allowed (default: Infinity)\n * @throws {BCCRDateError} If date is out of range\n */\nexport function validateDateRange(dateStr: string, maxDaysBack: number = Infinity): void {\n const date = validateDateParameter(dateStr);\n const today = dayjs();\n const minDate = dayjs('2000-01-01'); // BCCR calendar epoch\n\n if (date.isAfter(today)) {\n throw new BCCRDateError(`Date cannot be in the future: ${dateStr}`);\n }\n\n if (date.isBefore(minDate)) {\n throw new BCCRDateError(\n `Date cannot be before ${minDate.format('YYYY-MM-DD')}: ${dateStr}`\n );\n }\n\n // Check configurable max_days_back limit\n if (maxDaysBack !== Infinity) {\n const daysBack = today.diff(date, 'day');\n if (daysBack > maxDaysBack) {\n const oldestAllowed = today.subtract(maxDaysBack, 'day').format('YYYY-MM-DD');\n throw new BCCRDateError(\n `Date is too far in the past. Maximum ${maxDaysBack} days back allowed. Oldest date: ${oldestAllowed}`\n );\n }\n }\n}\n\n/**\n * Converts date to calendar days argument for ASP.NET calendar control\n * The calendar uses an epoch of January 1, 2000\n * @param targetDate - Target date\n * @returns Number of days since January 1, 2000\n */\nexport function dateToCalendarDays(targetDate: dayjs.Dayjs): number {\n const epoch = dayjs('2000-01-01');\n return targetDate.diff(epoch, 'day');\n}\n\n/**\n * Parses rate string to number\n * @param rateStr - Rate string (e.g., \"532.50\", \"532,50\", \"-\", \"N/D\")\n * @returns Parsed rate or null if not available\n */\nexport function parseRate(rateStr: string): number | null {\n const cleaned = rateStr.trim();\n\n // Handle missing data indicators\n if (cleaned === '-' || cleaned === 'N/D' || cleaned === '' || cleaned === 'N.D.') {\n return null;\n }\n\n // Replace comma with period for decimal separator\n const normalized = cleaned.replace(',', '.');\n\n const parsed = parseFloat(normalized);\n\n if (isNaN(parsed)) {\n return null;\n }\n\n return parsed;\n}\n\n/**\n * Calculates number of months between two dates\n * Uses explicit calculation to match Python implementation exactly\n * @param startDate - Start date (earlier date)\n * @param endDate - End date (later date)\n * @returns Number of months difference\n */\nexport function monthsBetween(startDate: dayjs.Dayjs, endDate: dayjs.Dayjs): number {\n // Explicit calculation matching Python: (endDate.year - startDate.year) * 12 + (endDate.month - startDate.month)\n return (endDate.year() - startDate.year()) * 12 + (endDate.month() - startDate.month());\n}\n","import axios, { AxiosError, AxiosInstance } from 'axios';\nimport * as cheerio from 'cheerio';\nimport dayjs from 'dayjs';\nimport { wrapper } from 'axios-cookiejar-support';\nimport { CookieJar } from 'tough-cookie';\nimport {\n BCCRConnectionError,\n BCCRScrapingError,\n BCCRParseError,\n} from './exceptions';\nimport {\n parseSpanishDate,\n formatLastUpdate,\n parseRate,\n dateToCalendarDays,\n monthsBetween,\n} from './utils';\nimport type {\n EntityData,\n ScrapeResult,\n ViewStateData,\n HierarchicalData,\n EntitySummary,\n} from './types';\n\nconst VENTANILLA_URL =\n 'https://gee.bccr.fi.cr/indicadoreseconomicos/Cuadros/frmConsultaTCVentanilla.aspx';\n\n/**\n * Main scraper function - orchestrates data fetching\n * @param date - Optional date in YYYY-MM-DD format (defaults to today)\n * @returns Scrape result with entities and date\n */\nexport async function scrapeVentanillaPage(\n date?: string\n): Promise {\n try {\n let html: string;\n\n if (date) {\n // Fetch historical data\n html = await fetchVentanillaForSpecificDate(dayjs(date));\n } else {\n // Fetch current data (simple GET request)\n const response = await axios.get(VENTANILLA_URL, {\n timeout: 30000,\n headers: {\n 'User-Agent':\n 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36',\n },\n });\n html = response.data;\n }\n\n const $ = cheerio.load(html);\n\n // Extract date from page\n const pageDate = extractPageDate($);\n\n // Parse the exchange rate table\n const entities = parseExchangeRateTable($);\n\n return {\n entities,\n date: pageDate,\n };\n } catch (error) {\n if (error instanceof BCCRConnectionError || error instanceof BCCRScrapingError || error instanceof BCCRParseError) {\n throw error;\n }\n\n if (axios.isAxiosError(error)) {\n const axiosError = error as AxiosError;\n throw new BCCRConnectionError(\n `Failed to connect to BCCR: ${axiosError.message}`\n );\n }\n\n throw new BCCRScrapingError(\n `Scraping failed: ${error instanceof Error ? error.message : String(error)}`\n );\n }\n}\n\n/**\n * Fetches exchange rates for a specific historical date\n * Handles ASP.NET ViewState and calendar navigation\n * @param targetDate - Target date\n * @returns HTML content for the target date\n */\nasync function fetchVentanillaForSpecificDate(\n targetDate: dayjs.Dayjs\n): Promise {\n try {\n // Create axios instance with cookie jar support\n const jar = new CookieJar();\n const client = wrapper(axios.create({ jar }));\n\n // Step 1: Initial GET to fetch ViewState\n const initialResponse = await client.get(VENTANILLA_URL, {\n timeout: 30000,\n headers: {\n 'User-Agent':\n 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36',\n },\n });\n\n let viewState = extractViewState(cheerio.load(initialResponse.data));\n\n // Step 2: Open calendar by clicking the calendar image\n const calendarResponse = await postFormData(\n {\n ...viewState,\n __EVENTTARGET: '',\n __EVENTARGUMENT: '',\n 'imgCalendario.x': '10',\n 'imgCalendario.y': '10',\n 'CtrlBuscar2:txtPalabras': '',\n },\n client\n );\n\n viewState = extractViewState(cheerio.load(calendarResponse));\n\n // Step 3: Navigate to target month\n // Calculate months to navigate backwards\n const today = dayjs();\n const monthsToNavigate = monthsBetween(targetDate, today);\n\n let currentResponse = calendarResponse;\n\n for (let i = 0; i < monthsToNavigate; i++) {\n // Extract previous month link from current calendar HTML\n const $ = cheerio.load(currentResponse);\n const prevMonthLink = extractPrevMonthLink($);\n\n if (!prevMonthLink) {\n throw new BCCRScrapingError('Could not find previous month link in calendar');\n }\n\n // Navigate to previous month\n const navResponse = await postFormData({\n ...viewState,\n __EVENTTARGET: 'Calendar1',\n __EVENTARGUMENT: prevMonthLink,\n 'CtrlBuscar2:txtPalabras': '',\n }, client);\n\n // Update for next iteration\n currentResponse = navResponse;\n viewState = extractViewState(cheerio.load(navResponse));\n }\n\n // Step 4: Select the specific date\n const calendarDays = dateToCalendarDays(targetDate);\n const finalResponse = await postFormData({\n ...viewState,\n __EVENTTARGET: 'Calendar1',\n __EVENTARGUMENT: calendarDays.toString(),\n 'CtrlBuscar2:txtPalabras': '',\n }, client);\n\n return finalResponse;\n } catch (error) {\n if (error instanceof BCCRConnectionError || error instanceof BCCRScrapingError) {\n throw error;\n }\n\n throw new BCCRScrapingError(\n `Failed to fetch historical data: ${error instanceof Error ? error.message : String(error)}`\n );\n }\n}\n\n/**\n * Posts form data to BCCR with proper headers\n * @param formData - Form data to post\n * @param client - Optional axios instance (with cookie jar for sessions)\n * @returns Response HTML\n */\nasync function postFormData(\n formData: ViewStateData & Record,\n client: AxiosInstance = axios\n): Promise {\n try {\n // Clean form data - remove undefined values but keep empty strings\n const cleanedFormData: Record = {};\n for (const [key, value] of Object.entries(formData)) {\n if (value !== undefined && value !== null) {\n cleanedFormData[key] = value;\n }\n }\n\n const response = await client.post(VENTANILLA_URL, new URLSearchParams(cleanedFormData).toString(), {\n timeout: 30000,\n headers: {\n 'Content-Type': 'application/x-www-form-urlencoded',\n 'User-Agent':\n 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36',\n 'Referer': VENTANILLA_URL,\n },\n withCredentials: true,\n validateStatus: (status) => status < 600, // Don't throw on 4xx/5xx\n });\n\n if (response.status >= 400) {\n const errorMsg = `POST request failed with status ${response.status}`;\n const responseText = typeof response.data === 'string' ? response.data.substring(0, 500) : '';\n throw new BCCRConnectionError(`${errorMsg}. Response: ${responseText}`);\n }\n\n return response.data;\n } catch (error) {\n if (error instanceof BCCRConnectionError) {\n throw error;\n }\n if (axios.isAxiosError(error)) {\n throw new BCCRConnectionError(\n `POST request failed: ${error.message}`\n );\n }\n throw error;\n }\n}\n\n/**\n * Extracts ASP.NET ViewState from HTML\n * @param $ - Cheerio instance\n * @returns ViewState data\n */\nfunction extractViewState($: cheerio.CheerioAPI): ViewStateData {\n const viewState = $('input[name=\"__VIEWSTATE\"]').val();\n const eventValidation = $('input[name=\"__EVENTVALIDATION\"]').val();\n const viewStateGenerator = $('input[name=\"__VIEWSTATEGENERATOR\"]').val();\n\n if (!viewState || !eventValidation) {\n throw new BCCRParseError('Could not extract ViewState from page');\n }\n\n return {\n __VIEWSTATE: viewState.toString(),\n __EVENTVALIDATION: eventValidation.toString(),\n __VIEWSTATEGENERATOR: viewStateGenerator ? viewStateGenerator.toString() : '',\n };\n}\n\n/**\n * Extracts the previous month link from calendar\n * @param $ - Cheerio instance\n * @returns Previous month link argument (e.g., \"V9405\")\n */\nexport function extractPrevMonthLink($: cheerio.CheerioAPI): string | null {\n // Look for the Calendar1 table\n const calendar = $('table#Calendar1');\n\n if (calendar.length === 0) {\n return null;\n }\n\n // Find all links in the calendar\n const links = calendar.find('a');\n\n for (let i = 0; i < links.length; i++) {\n const link = links.eq(i);\n const title = (link.attr('title') || '').toLowerCase();\n\n // Look for \"previous month\" or Spanish \"mes anterior\"\n if (title.includes('previous month') || title.includes('anterior')) {\n const href = link.attr('href') || '';\n\n // Extract __EVENTARGUMENT from javascript:__doPostBack('Calendar1','V9405')\n const match = href.match(/__doPostBack\\('([^']*)',\\s*'([^']*)'\\)/);\n if (match) {\n return match[2]; // Return the event argument (e.g., \"V9405\")\n }\n }\n }\n\n return null;\n}\n\n/**\n * Extracts the date from the page header\n * @param $ - Cheerio instance\n * @returns ISO date string (YYYY-MM-DD)\n */\nexport function extractPageDate($: cheerio.CheerioAPI): string {\n // Strategy 1: Look for text containing date pattern\n const datePattern = /(\\w+,?\\s+)?\\d+\\s+de\\s+\\w+\\s+de\\s+\\d{4}/;\n\n // Search through all text nodes\n const pageText = $.root().text();\n const dateMatch = pageText.match(datePattern);\n\n if (dateMatch) {\n return parseSpanishDate(dateMatch[0]);\n }\n\n // Fallback to today\n const dayjs = require('dayjs');\n return dayjs().format('YYYY-MM-DD');\n}\n\n/**\n * Parses the exchange rate table\n * @param $ - Cheerio instance\n * @returns Array of entity data\n */\nexport function parseExchangeRateTable($: cheerio.CheerioAPI): EntityData[] {\n const entities: EntityData[] = [];\n const table = $('#DG');\n\n if (table.length === 0) {\n throw new BCCRParseError('Could not find exchange rate table (id=\"DG\")');\n }\n\n let currentEntityType = '';\n\n // Iterate through table rows\n table.find('tr').each((_, row) => {\n const $row = $(row);\n const cells = $row.find('td');\n\n if (cells.length === 0) {\n return; // Skip header row\n }\n\n if (cells.length < 5) {\n return; // Skip malformed rows\n }\n\n // Extract entity data based on column count\n let entityTypeCell: string;\n let entityName: string;\n let buyRate: string;\n let sellRate: string;\n let spread: string;\n let lastUpdate: string;\n\n if (cells.length === 6) {\n // Row with entity type column\n entityTypeCell = cells.eq(0).text().trim();\n entityName = cells.eq(1).text().trim();\n buyRate = cells.eq(2).text().trim();\n sellRate = cells.eq(3).text().trim();\n spread = cells.eq(4).text().trim();\n lastUpdate = cells.eq(5).text().trim();\n\n // Update current entity type if this cell has content\n if (entityTypeCell) {\n currentEntityType = entityTypeCell;\n }\n } else if (cells.length === 5) {\n // Row without entity type column (continuation with rowspan)\n entityName = cells.eq(0).text().trim();\n buyRate = cells.eq(1).text().trim();\n sellRate = cells.eq(2).text().trim();\n spread = cells.eq(3).text().trim();\n lastUpdate = cells.eq(4).text().trim();\n } else {\n return; // Skip other malformed rows\n }\n\n if (!entityName) {\n return; // Skip empty rows\n }\n\n entities.push({\n entity_type: currentEntityType,\n entity_name: entityName,\n buy_rate: parseRate(buyRate),\n sell_rate: parseRate(sellRate),\n spread: parseRate(spread),\n last_update: formatLastUpdate(lastUpdate),\n last_update_str: lastUpdate,\n });\n });\n\n if (entities.length === 0) {\n throw new BCCRParseError('No exchange rate data found in table');\n }\n\n return entities;\n}\n\n/**\n * Groups entities by type\n * @param entities - Array of entity data\n * @returns Hierarchical data organized by entity type\n */\nexport function groupEntitiesByType(\n entities: EntityData[]\n): HierarchicalData {\n const grouped: HierarchicalData = {};\n\n for (const entity of entities) {\n if (!grouped[entity.entity_type]) {\n grouped[entity.entity_type] = [];\n }\n grouped[entity.entity_type].push(entity);\n }\n\n return grouped;\n}\n\n/**\n * Generates summary statistics for entities\n * @param entities - Array of entity data\n * @returns Entity summary\n */\nexport function getEntitySummary(entities: EntityData[]): EntitySummary {\n const byType: Record = {};\n\n for (const entity of entities) {\n if (!byType[entity.entity_type]) {\n byType[entity.entity_type] = 0;\n }\n byType[entity.entity_type]++;\n }\n\n return {\n total: entities.length,\n by_type: byType,\n };\n}\n","import { validateDateParameter, validateDateRange } from './utils';\nimport { scrapeVentanillaPage, groupEntitiesByType } from './scraper';\nimport type { EntityData, Format, HierarchicalData } from './types';\n\n/**\n * Filters out header rows and entities without valid exchange rates\n * @param entities - Array of entity data\n * @returns Filtered array containing only entities with buy_rate or sell_rate\n */\nfunction filterValidEntities(entities: EntityData[]): EntityData[] {\n return entities.filter(\n (entity) => entity.buy_rate !== null || entity.sell_rate !== null\n );\n}\n\n/**\n * Gets current exchange rates from BCCR\n * @param format - Output format: 'flat' (default) or 'hierarchical'\n * @returns Array of entity data (flat) or hierarchical object\n * @example\n * ```typescript\n * // Get flat list of all entities\n * const rates = await getCurrentRates();\n *\n * // Get rates organized by entity type\n * const ratesByType = await getCurrentRates('hierarchical');\n * ```\n */\nexport async function getCurrentRates(\n format: Format = 'flat'\n): Promise {\n const result = await scrapeVentanillaPage();\n const filtered = filterValidEntities(result.entities);\n\n if (format === 'hierarchical') {\n return groupEntitiesByType(filtered);\n }\n\n return filtered;\n}\n\n/**\n * Gets exchange rates for a specific date\n * @param date - Date in YYYY-MM-DD or DD/MM/YYYY format\n * @param format - Output format: 'flat' (default) or 'hierarchical'\n * @param maxDaysBack - Maximum number of days back allowed (default: Infinity)\n * @returns Array of entity data (flat) or hierarchical object\n * @throws {BCCRDateError} If date is invalid or out of range\n * @example\n * ```typescript\n * // Get rates for a specific date\n * const rates = await getRatesByDate('2025-11-04');\n *\n * // Get rates organized by entity type\n * const ratesByType = await getRatesByDate('2025-11-04', 'hierarchical');\n *\n * // Limit query to last 365 days\n * const recentRates = await getRatesByDate('2025-01-01', 'flat', 365);\n * ```\n */\nexport async function getRatesByDate(\n date: string,\n format: Format = 'flat',\n maxDaysBack: number = Infinity\n): Promise {\n // Validate date\n const validatedDate = validateDateParameter(date);\n validateDateRange(date, maxDaysBack);\n\n const result = await scrapeVentanillaPage(validatedDate.format('YYYY-MM-DD'));\n const filtered = filterValidEntities(result.entities);\n\n if (format === 'hierarchical') {\n return groupEntitiesByType(filtered);\n }\n\n return filtered;\n}\n\n/**\n * Searches for entities matching a query string\n * @param query - Search query (searches in entity name and type)\n * @param date - Optional date in YYYY-MM-DD or DD/MM/YYYY format\n * @param format - Output format: 'flat' (default) or 'hierarchical'\n * @param maxDaysBack - Maximum number of days back allowed (default: Infinity)\n * @returns Filtered array of entity data (flat) or hierarchical object\n * @example\n * ```typescript\n * // Search for entities containing \"Nacional\"\n * const results = await searchEntities('Nacional');\n *\n * // Search in historical data\n * const historicalResults = await searchEntities('Banco', '2025-11-04');\n *\n * // Search and organize by type\n * const resultsByType = await searchEntities('Banco', undefined, 'hierarchical');\n *\n * // Search with date range limit\n * const recentResults = await searchEntities('Banco', '2025-01-01', 'flat', 365);\n * ```\n */\nexport async function searchEntities(\n query: string,\n date?: string,\n format: Format = 'flat',\n maxDaysBack: number = Infinity\n): Promise {\n let result;\n\n if (date) {\n const validatedDate = validateDateParameter(date);\n validateDateRange(date, maxDaysBack);\n result = await scrapeVentanillaPage(validatedDate.format('YYYY-MM-DD'));\n } else {\n result = await scrapeVentanillaPage();\n }\n\n // Filter out invalid entities first, then filter by query\n const validEntities = filterValidEntities(result.entities);\n const queryLower = query.toLowerCase();\n const filtered = validEntities.filter(\n (entity) =>\n entity.entity_name.toLowerCase().includes(queryLower) ||\n entity.entity_type.toLowerCase().includes(queryLower)\n );\n\n if (format === 'hierarchical') {\n return groupEntitiesByType(filtered);\n }\n\n return filtered;\n}\n\n/**\n * Gets exchange rate data for a specific entity by name\n * @param entityName - Exact or partial entity name to search for\n * @param date - Optional date in YYYY-MM-DD or DD/MM/YYYY format\n * @param maxDaysBack - Maximum number of days back allowed (default: Infinity)\n * @returns Entity data or null if not found\n * @example\n * ```typescript\n * // Get current rates for Banco Nacional\n * const entity = await getEntityByName('Banco Nacional');\n *\n * // Get historical rates for a specific entity\n * const historicalEntity = await getEntityByName('Banco Nacional', '2025-11-04');\n *\n * // Get entity with date range limit\n * const recentEntity = await getEntityByName('Banco Nacional', '2025-01-01', 365);\n * ```\n */\nexport async function getEntityByName(\n entityName: string,\n date?: string,\n maxDaysBack: number = Infinity\n): Promise {\n let result;\n\n if (date) {\n const validatedDate = validateDateParameter(date);\n validateDateRange(date, maxDaysBack);\n result = await scrapeVentanillaPage(validatedDate.format('YYYY-MM-DD'));\n } else {\n result = await scrapeVentanillaPage();\n }\n\n // Filter out invalid entities first\n const validEntities = filterValidEntities(result.entities);\n\n // Find entity by exact name match (case-insensitive)\n const entityLower = entityName.toLowerCase();\n const found = validEntities.find(\n (entity) => entity.entity_name.toLowerCase() === entityLower\n );\n\n if (found) {\n return found;\n }\n\n // If no exact match, try partial match\n const partialMatch = validEntities.find((entity) =>\n entity.entity_name.toLowerCase().includes(entityLower)\n );\n\n return partialMatch || null;\n}\n\n// Re-export types and exceptions for convenience\nexport type { EntityData, Format, HierarchicalData, EntitySummary } from './types';\nexport {\n BCCRError,\n BCCRScrapingError,\n BCCRDateError,\n BCCRConnectionError,\n BCCRParseError,\n} from './exceptions';\n"]}