feature: added currency conversion infobox

1 files changed, 474 insertions, 0 deletions

diff --git a/src/Infobox/CurrencyConversion.c b/src/Infobox/CurrencyConversion.c
new file mode 100644
index 0000000..f9d1fa6
--- /dev/null
+++ b/src/Infobox/CurrencyConversion.c
@@ -0,0 +1,474 @@
+#include "CurrencyConversion.h"
+#include "../Cache/Cache.h"
+#include "../Utility/HttpClient.h"
+#include "../Utility/JsonHelper.h"
+#include <ctype.h>
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+typedef struct {
+  const char *code;
+  const char *name;
+  const char *symbol;
+  int is_crypto;
+} CurrencyDef;
+
+static const CurrencyDef CURRENCIES[] = {
+    {"USD", "US Dollar", "$", 0},
+    {"EUR", "Euro", "€", 0},
+    {"GBP", "British Pound", "£", 0},
+    {"JPY", "Japanese Yen", "¥", 0},
+    {"AUD", "Australian Dollar", "A$", 0},
+    {"CAD", "Canadian Dollar", "C$", 0},
+    {"CHF", "Swiss Franc", "CHF", 0},
+    {"CNY", "Chinese Yuan", "¥", 0},
+    {"INR", "Indian Rupee", "₹", 0},
+    {"KRW", "South Korean Won", "₩", 0},
+    {"BRL", "Brazilian Real", "R$", 0},
+    {"RUB", "Russian Ruble", "₽", 0},
+    {"ZAR", "South African Rand", "R", 0},
+    {"MXN", "Mexican Peso", "MX$", 0},
+    {"SGD", "Singapore Dollar", "S$", 0},
+    {"HKD", "Hong Kong Dollar", "HK$", 0},
+    {"NOK", "Norwegian Krone", "kr", 0},
+    {"SEK", "Swedish Krona", "kr", 0},
+    {"DKK", "Danish Krone", "kr", 0},
+    {"NZD", "New Zealand Dollar", "NZ$", 0},
+    {"TRY", "Turkish Lira", "₺", 0},
+    {"PLN", "Polish Zloty", "zł", 0},
+    {"THB", "Thai Baht", "฿", 0},
+    {"IDR", "Indonesian Rupiah", "Rp", 0},
+    {"HUF", "Hungarian Forint", "Ft", 0},
+    {"CZK", "Czech Koruna", "Kč", 0},
+    {"ILS", "Israeli Shekel", "₪", 0},
+    {"CLP", "Chilean Peso", "CLP$", 0},
+    {"PHP", "Philippine Peso", "₱", 0},
+    {"AED", "UAE Dirham", "د.إ", 0},
+    {"COP", "Colombian Peso", "COP$", 0},
+    {"SAR", "Saudi Riyal", "﷼", 0},
+    {"MYR", "Malaysian Ringgit", "RM", 0},
+    {"RON", "Romanian Leu", "lei", 0},
+    {"ARS", "Argentine Peso", "ARS$", 0},
+    {"PKR", "Pakistani Rupee", "₨", 0},
+    {"EGP", "Egyptian Pound", "£", 0},
+    {"VND", "Vietnamese Dong", "₫", 0},
+    {"NGN", "Nigerian Naira", "₦", 0},
+    {"BDT", "Bangladeshi Taka", "৳", 0},
+    {"UAH", "Ukrainian Hryvnia", "₴", 0},
+    {"PEN", "Peruvian Sol", "S/", 0},
+    {"BGN", "Bulgarian Lev", "лв", 0},
+    {"HRK", "Croatian Kuna", "kn", 0},
+    {"ISK", "Icelandic Krona", "kr", 0},
+    {"MAD", "Moroccan Dirham", "د.م.", 0},
+    {"KES", "Kenyan Shilling", "KSh", 0},
+    {"QAR", "Qatari Riyal", "﷼", 0},
+    {"KWD", "Kuwaiti Dinar", "د.ك", 0},
+    {"BHD", "Bahraini Dinar", ".د.ب", 0},
+    {"OMR", "Omani Rial", "﷼", 0},
+    {"JOD", "Jordanian Dinar", "د.ا", 0},
+    {"TWD", "Taiwan Dollar", "NT$", 0},
+
+    {"BTC", "Bitcoin", "₿", 1},
+    {"ETH", "Ethereum", "Ξ", 1},
+    {"USDT", "Tether", "₮", 1},
+    {"BNB", "Binance Coin", "BNB", 1},
+    {"XRP", "Ripple", "XRP", 1},
+    {"USDC", "USD Coin", "$", 1},
+    {"ADA", "Cardano", "ADA", 1},
+    {"DOGE", "Dogecoin", "Ð", 1},
+    {"SOL", "Solana", "SOL", 1},
+    {"TRX", "Tron", "TRX", 1},
+    {"DOT", "Polkadot", "DOT", 1},
+    {"MATIC", "Polygon", "MATIC", 1},
+    {"LTC", "Litecoin", "Ł", 1},
+    {"SHIB", "Shiba Inu", "SHIB", 1},
+    {"AVAX", "Avalanche", "AVAX", 1},
+    {"LINK", "Chainlink", "LINK", 1},
+    {"ATOM", "Cosmos", "ATOM", 1},
+    {"XMR", "Monero", "XMR", 1},
+    {"ETC", "Ethereum Classic", "ETC", 1},
+    {"XLM", "Stellar", "XLM", 1},
+    {"BCH", "Bitcoin Cash", "BCH", 1},
+    {"ALGO", "Algorand", "ALGO", 1},
+    {"VET", "VeChain", "VET", 1},
+    {"FIL", "Filecoin", "FIL", 1},
+    {"NEAR", "NEAR Protocol", "NEAR", 1},
+    {"APT", "Aptos", "APT", 1},
+    {"ARB", "Arbitrum", "ARB", 1},
+    {"OP", "Optimism", "OP", 1},
+    {"SAND", "The Sandbox", "SAND", 1},
+    {"MANA", "Decentraland", "MANA", 1},
+    {"AXS", "Axie Infinity", "AXS", 1},
+    {"AAVE", "Aave", "AAVE", 1},
+    {"MKR", "Maker", "MKR", 1},
+    {"GRT", "The Graph", "GRT", 1},
+    {"FTM", "Fantom", "FTM", 1},
+    {"CRO", "Cronos", "CRO", 1},
+    {"NEAR", "NEAR Protocol", "NEAR", 1},
+    {"INJ", "Injective", "INJ", 1},
+    {"RUNE", "THORChain", "RUNE", 1},
+    {"LDO", "Lido DAO", "LDO", 1},
+    {"QNT", "Quant", "QNT", 1},
+    {"RNDR", "Render", "RNDR", 1},
+    {"STX", "Stacks", "STX", 1},
+    {"IMX", "Immutable X", "IMX", 1},
+    {"SNX", "Synthetix", "SNX", 1},
+    {"THETA", "Theta", "THETA", 1},
+    {"XTZ", "Tezos", "XTZ", 1},
+    {"EOS", "EOS", "EOS", 1},
+    {"FLOW", "Flow", "FLOW", 1},
+    {"CHZ", "Chiliz", "CHZ", 1},
+    {"CRV", "Curve DAO", "CRV", 1},
+    {"APE", "ApeCoin", "APE", 1},
+    {"PEPE", "Pepe", "PEPE", 1},
+    {"WIF", "dogwifhat", "WIF", 1},
+    {"SUI", "Sui", "SUI", 1},
+    {"SEI", "Sei", "SEI", 1},
+    {"TIA", "Celestia", "TIA", 1},
+    {"PYTH", "Pyth Network", "PYTH", 1},
+    {"BONK", "Bonk", "BONK", 1},
+    {"FET", "Fetch.ai", "FET", 1},
+    {"AGIX", "SingularityNET", "AGIX", 1},
+    {"RNDR", "Render Token", "RNDR", 1},
+};
+
+static const int CURRENCY_COUNT = sizeof(CURRENCIES) / sizeof(CURRENCIES[0]);
+
+static int is_whitespace(char c) {
+  return c == ' ' || c == '\t' || c == '\n' || c == '\r';
+}
+
+static const CurrencyDef *find_currency(const char *str) {
+  if (!str || !*str)
+    return NULL;
+
+  size_t len = strlen(str);
+  if (len < 2 || len > 10)
+    return NULL;
+
+  char normalized[16] = {0};
+  size_t j = 0;
+  for (size_t i = 0; i < len && j < 15; i++) {
+    normalized[j++] = toupper((unsigned char)str[i]);
+  }
+  normalized[j] = '\0';
+
+  for (int i = 0; i < CURRENCY_COUNT; i++) {
+    if (strcmp(normalized, CURRENCIES[i].code) == 0) {
+      return &CURRENCIES[i];
+    }
+  }
+  return NULL;
+}
+
+int is_currency_query(const char *query) {
+  if (!query)
+    return 0;
+
+  const char *patterns[] = {" to ", " in ", " into ", " = ", " equals ", NULL};
+
+  int has_pattern = 0;
+  for (int i = 0; patterns[i]; i++) {
+    if (strstr(query, patterns[i])) {
+      has_pattern = 1;
+      break;
+    }
+  }
+
+  if (!has_pattern) {
+    const char *last_space = strrchr(query, ' ');
+    if (last_space) {
+      const CurrencyDef *c = find_currency(last_space + 1);
+      if (c) {
+        const char *before = query;
+        while (*before && is_whitespace(*before))
+          before++;
+        const char *num_end = before;
+        while (*num_end &&
+               (isdigit(*num_end) || *num_end == '.' || *num_end == ',' ||
+                *num_end == '-' || *num_end == '+')) {
+          num_end++;
+        }
+        if (num_end > before)
+          has_pattern = 1;
+      }
+    }
+  }
+
+  return has_pattern;
+}
+
+static double parse_value(const char **ptr) {
+  const char *p = *ptr;
+  while (*p && is_whitespace(*p))
+    p++;
+
+  double value = 0.0;
+  int has_decimal = 0;
+  double decimal_place = 1.0;
+
+  if (*p == '-' || *p == '+')
+    p++;
+
+  while (*p >= '0' && *p <= '9') {
+    value = value * 10 + (*p - '0');
+    if (has_decimal)
+      decimal_place *= 10;
+    p++;
+  }
+
+  if (*p == '.' || *p == ',') {
+    has_decimal = 1;
+    p++;
+    while (*p >= '0' && *p <= '9') {
+      value = value * 10 + (*p - '0');
+      decimal_place *= 10;
+      p++;
+    }
+  }
+
+  if (has_decimal)
+    value /= decimal_place;
+
+  *ptr = p;
+  return value;
+}
+
+static int parse_currency_query(const char *query, double *value,
+                                const CurrencyDef **from_curr,
+                                const CurrencyDef **to_curr) {
+  *value = 0;
+  *from_curr = NULL;
+  *to_curr = NULL;
+
+  const char *value_end = query;
+  *value = parse_value(&value_end);
+
+  if (value_end == query)
+    return 0;
+
+  const char *p = value_end;
+  while (*p && is_whitespace(*p))
+    p++;
+
+  size_t remaining = strlen(p);
+  if (remaining < 2)
+    return 0;
+
+  const char *to_keywords[] = {" to ", " in ", " into ", " -> ",
+                               " → ",  " = ",  NULL};
+  const char *to_pos = NULL;
+  size_t keyword_len = 0;
+  for (int i = 0; to_keywords[i]; i++) {
+    const char *found = strstr(p, to_keywords[i]);
+    if (found) {
+      to_pos = found + strlen(to_keywords[i]);
+      keyword_len = strlen(to_keywords[i]);
+      break;
+    }
+  }
+
+  if (!to_pos) {
+    const char *last_space = strrchr(p, ' ');
+    if (last_space && last_space > p) {
+      char from_part[32] = {0};
+      size_t len = last_space - p;
+      if (len < 31) {
+        strncpy(from_part, p, len);
+        *from_curr = find_currency(from_part);
+        if (*from_curr) {
+          *to_curr = find_currency(last_space + 1);
+          return *to_curr ? 1 : 0;
+        }
+      }
+    }
+    return 0;
+  }
+
+  char from_part[32] = {0};
+  size_t from_len = to_pos - p - keyword_len;
+  if (from_len > 31)
+    from_len = 31;
+  strncpy(from_part, p, from_len);
+
+  char *end_from = from_part + from_len;
+  while (end_from > from_part && is_whitespace(end_from[-1]))
+    end_from--;
+  *end_from = '\0';
+
+  *from_curr = find_currency(from_part);
+  if (!*from_curr) {
+    return 0;
+  }
+
+  while (*to_pos && is_whitespace(*to_pos))
+    to_pos++;
+
+  if (!*to_pos)
+    return 0;
+
+  char to_part[32] = {0};
+  size_t to_len = 0;
+  const char *tp = to_pos;
+  while (*tp && !is_whitespace(*tp) && to_len < 31) {
+    to_part[to_len++] = *tp++;
+  }
+  to_part[to_len] = '\0';
+
+  *to_curr = find_currency(to_part);
+  if (!*to_curr) {
+    char try_buf[32] = {0};
+    strncpy(try_buf, to_pos, 31);
+    *to_curr = find_currency(try_buf);
+  }
+
+  return *to_curr ? 1 : 0;
+}
+
+static double get_rate_from_json(const char *json, const char *target_code) {
+  JsonFloatMap map;
+  if (json_parse_float_map(json, "rates", &map)) {
+    for (size_t i = 0; i < map.count; i++) {
+      if (strcmp(map.keys[i], target_code) == 0) {
+        return map.values[i];
+      }
+    }
+  }
+  return 0;
+}
+
+static void format_number(double val, char *buf, size_t bufsize) {
+  if (bufsize == 0)
+    return;
+  if (val == 0) {
+    snprintf(buf, bufsize, "0");
+    return;
+  }
+  if (fabs(val) < 0.01 && fabs(val) > 0) {
+    snprintf(buf, bufsize, "%.6f", val);
+  } else if (fabs(val) < 1) {
+    snprintf(buf, bufsize, "%.4f", val);
+    char *p = buf + strlen(buf) - 1;
+    while (p > buf && (*p == '0' || *p == '.')) {
+      if (*p == '.')
+        break;
+      *p-- = '\0';
+    }
+  } else if (fmod(val + 0.0001, 1.0) < 0.0002) {
+    snprintf(buf, bufsize, "%.0f", val);
+  } else {
+    snprintf(buf, bufsize, "%.2f", val);
+    char *p = buf + strlen(buf) - 1;
+    while (p > buf && (*p == '0' || *p == '.')) {
+      if (*p == '.')
+        break;
+      *p-- = '\0';
+    }
+  }
+}
+
+static char *build_html(double value, const CurrencyDef *from,
+                        const CurrencyDef *to, double result) {
+  static char html[4096];
+  char val_buf[64], res_buf[64];
+
+  format_number(value, val_buf, sizeof(val_buf));
+  format_number(result, res_buf, sizeof(res_buf));
+
+  snprintf(html, sizeof(html),
+           "<div class='currency-conv-container' style='line-height: 1.6;'>"
+           "<div style='font-size: 1.3em; margin-bottom: 8px;'>"
+           "<b>%s %s</b> = <b>%s %s</b></div>"
+           "<div style='font-size: 0.9em; color: #666;'>"
+           "1 %s = %.4f %s</div>"
+           "</div>",
+           val_buf, from->code, res_buf, to->code, from->code, result / value,
+           to->code);
+
+  return html;
+}
+
+InfoBox fetch_currency_data(const char *query) {
+  InfoBox info = {NULL, NULL, NULL, NULL};
+  if (!query)
+    return info;
+
+  double value = 0;
+  const CurrencyDef *from_curr = NULL;
+  const CurrencyDef *to_curr = NULL;
+
+  if (!parse_currency_query(query, &value, &from_curr, &to_curr))
+    return info;
+  if (!from_curr || !to_curr)
+    return info;
+  if (strcmp(from_curr->code, to_curr->code) == 0)
+    return info;
+
+  char cache_key[128];
+  snprintf(cache_key, sizeof(cache_key), "currency_%s_%s", from_curr->code,
+           to_curr->code);
+
+  char *cached_data = NULL;
+  size_t cached_size = 0;
+  double rate = 0;
+  int use_cache = 0;
+
+  int is_crypto = from_curr->is_crypto || to_curr->is_crypto;
+
+  if (get_cache_ttl_infobox() > 0) {
+    if (cache_get(cache_key, get_cache_ttl_infobox(), &cached_data,
+                  &cached_size) == 0 &&
+        cached_data && cached_size > 0) {
+      if (is_crypto) {
+        rate = json_get_float(cached_data, to_curr->code);
+      } else {
+        rate = get_rate_from_json(cached_data, to_curr->code);
+      }
+      if (rate > 0) {
+        use_cache = 1;
+      }
+      free(cached_data);
+    }
+  }
+
+  if (!use_cache) {
+    char url[512];
+
+    if (is_crypto) {
+      snprintf(url, sizeof(url),
+               "https://min-api.cryptocompare.com/data/price?fsym=%s&tsyms=%s",
+               from_curr->code, to_curr->code);
+    } else {
+      snprintf(url, sizeof(url),
+               "https://api.exchangerate-api.com/v4/latest/%s",
+               from_curr->code);
+    }
+
+    HttpResponse resp = http_get(url, "libcurl-agent/1.0");
+    if (resp.memory && resp.size > 0) {
+      if (is_crypto) {
+        rate = json_get_float(resp.memory, to_curr->code);
+      } else {
+        rate = get_rate_from_json(resp.memory, to_curr->code);
+      }
+      if (rate > 0 && get_cache_ttl_infobox() > 0) {
+        cache_set(cache_key, resp.memory, resp.size);
+      }
+    }
+    http_response_free(&resp);
+  }
+
+  if (rate <= 0)
+    return info;
+
+  double result = value * rate;
+
+  info.title = strdup("Currency Conversion");
+  info.extract = strdup(build_html(value, from_curr, to_curr, result));
+  info.thumbnail_url = strdup("/static/calculation.svg");
+  info.url = strdup("#");
+
+  return info;
+}