1 files changed, 60 insertions, 240 deletions

diff --git a/src/currency.c b/src/currency.c
index 2add81b..ea81761 100644
--- a/src/currency.c
+++ b/src/currency.c
@@ -1,276 +1,96 @@
-#include <time.h>
+/*
+ * Copyright (C) 2008-2011 Robert Ancell.
+ *
+ * This program is free software: you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 2 of the License, or (at your option) any later
+ * version. See http://www.gnu.org/copyleft/gpl.html the full text of the
+ * license.
+ */
 
-#include <glib.h>
-#include <glib/gstdio.h>
-#include <gio/gio.h>
-#include <libxml/tree.h>
-#include <libxml/xpath.h>
-#include <libxml/xpathInternals.h>
+#include <string.h>
+#include <stdarg.h>
 
 #include "currency.h"
-#include "mp.h"
-
-typedef struct {
-	char* short_name;
-	MPNumber value;
-} currency;
-
-static currency* currencies = NULL;
-static int currency_count = 0;
-
-static gboolean downloading_rates = FALSE;
-static gboolean loaded_rates = FALSE;
-
-static char* get_rate_filepath()
-{
-	return g_build_filename(g_get_user_cache_dir(), "mate-calc", "eurofxref-daily.xml", NULL);
-}
+#include "mp-serializer.h"
+#include "currency-manager.h" // FIXME: Move out of here
 
-static int currency_get_index(const char *short_name)
+struct CurrencyPrivate
 {
-	int i;
+    gchar *name;
+    gchar *display_name;
+    gchar *symbol;
+    MPNumber value;
+};
 
-	for (i = 0; i < currency_count; i++)
-	{
-		if (!strcmp(short_name, currencies[i].short_name))
-		{
-			if (mp_is_negative(&currencies[i].value) || mp_is_zero(&currencies[i].value))
-			{
-				return -1;
-			}
-			else
-			{
-				return i;
-			}
-		}
-	}
+G_DEFINE_TYPE (Currency, currency, G_TYPE_OBJECT);
 
-	return -1;
-}
 
-/* A file needs to be redownloaded if it doesn't exist, or every 7 days.
- * When an error occur, it probably won't hurt to try to download again.
- */
-static int currency_rates_needs_update()
+Currency *
+currency_new(const gchar *name,
+             const gchar *display_name,
+             const gchar *symbol)
 {
-	gchar* filename = get_rate_filepath();
-	struct stat buf;
-
-	if (!g_file_test(filename, G_FILE_TEST_IS_REGULAR))
-	{
-		g_free(filename);
-		return 1;
-	}
-
-	if (g_stat(filename, &buf) == -1)
-	{
-		g_free(filename);
-		return 1;
-	}
-
-	g_free(filename);
+    Currency *currency = g_object_new(currency_get_type(), NULL);
 
-	if (difftime(time(NULL), buf.st_mtime) > (60 * 60 * 24 * 7))
-	{
-		return 1;
-	}
+    currency->priv->name = g_strdup(name);
+    currency->priv->display_name = g_strdup(display_name);
+    currency->priv->symbol = g_strdup(symbol);
 
-	return 0;
+    return currency;
 }
 
 
-static void download_cb(GObject* object, GAsyncResult* result, gpointer user_data)
+const gchar *
+currency_get_name(Currency *currency)
 {
-	GError* error = NULL;
-
-	if (g_file_copy_finish(G_FILE(object), result, &error))
-	{
-		g_debug("Rates updated");
-	}
-	else
-	{
-		g_warning("Couldn't download currency file: %s", error->message);
-	}
-
-	g_clear_error(&error);
-	downloading_rates = FALSE;
+    g_return_val_if_fail (currency != NULL, NULL);
+    return currency->priv->name;
 }
 
 
-static void currency_download_rates()
+const gchar *
+currency_get_display_name(Currency *currency)
 {
-	gchar* filename;
-	gchar* directory;
-	GFile* source;
-	GFile* dest;
-
-	downloading_rates = TRUE;
-	g_debug("Downloading rates...");
-
-	filename = get_rate_filepath();
-	directory = g_path_get_dirname(filename);
-	g_mkdir_with_parents(directory, 0755);
-	g_free(directory);
-
-	/* HACK: It is safe? */
-	source = g_file_new_for_uri("http://www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml");
-	dest = g_file_new_for_path(filename);
-	g_free(filename);
-
-	g_file_copy_async(source, dest, G_FILE_COPY_OVERWRITE, G_PRIORITY_DEFAULT, NULL, NULL, NULL, download_cb, NULL);
-	g_object_unref(source);
-	g_object_unref(dest);
+    g_return_val_if_fail (currency != NULL, NULL);
+    return currency->priv->display_name;
 }
 
 
-static void set_rate(xmlNodePtr node, currency* cur)
+const gchar *
+currency_get_symbol(Currency *currency)
 {
-	xmlAttrPtr attribute;
-
-	for (attribute = node->properties; attribute; attribute = attribute->next)
-	{
-		if (strcmp((char*) attribute->name, "currency") == 0)
-		{
-			cur->short_name = (char*) xmlNodeGetContent((xmlNodePtr) attribute);
-		}
-		else if (strcmp ((char*) attribute->name, "rate") == 0)
-		{
-			char* val = (char*) xmlNodeGetContent((xmlNodePtr) attribute);
-			mp_set_from_string(val, 10, &(cur->value));
-			xmlFree(val);
-		}
-	}
+    g_return_val_if_fail (currency != NULL, NULL);
+    return currency->priv->symbol;
 }
 
-static void currency_load_rates()
-{
-	char* filename = get_rate_filepath();
-	xmlDocPtr document;
-	xmlXPathContextPtr xpath_ctx;
-	xmlXPathObjectPtr xpath_obj;
-	int i;
-	int len;
-
-	g_return_if_fail(g_file_test(filename, G_FILE_TEST_IS_REGULAR));
-
-	xmlInitParser();
-	document = xmlReadFile(filename, NULL, 0);
-	g_free (filename);
-
-	if (document == NULL)
-	{
-		fprintf(stderr, "Couldn't parse data file\n");
-		return;
-	}
 
-	xpath_ctx = xmlXPathNewContext(document);
-
-	if (xpath_ctx == NULL)
-	{
-		xmlFreeDoc(document);
-		fprintf(stderr, "Couldn't create XPath context\n");
-		return;
-	}
-
-	xmlXPathRegisterNs(xpath_ctx, BAD_CAST("xref"), BAD_CAST("http://www.ecb.int/vocabulary/2002-08-01/eurofxref"));
-	xpath_obj = xmlXPathEvalExpression(BAD_CAST("//xref:Cube[@currency][@rate]"), xpath_ctx);
-
-	if (xpath_obj == NULL)
-	{
-		xmlXPathFreeContext(xpath_ctx);
-		xmlFreeDoc(document);
-		fprintf(stderr, "Couldn't create XPath object\n");
-		return;
-	}
-
-	len = (xpath_obj->nodesetval) ? xpath_obj->nodesetval->nodeNr : 0;
-	currency_count = len + 1;
-	currencies = g_slice_alloc0(sizeof(currency) * currency_count);
-
-	for (i = 0; i < len; i++)
-	{
-		if (xpath_obj->nodesetval->nodeTab[i]->type == XML_ELEMENT_NODE)
-		{
-			set_rate(xpath_obj->nodesetval->nodeTab[i], &currencies[i]);
-		}
-
-		// Avoid accessing removed elements
-		if (xpath_obj->nodesetval->nodeTab[i]->type != XML_NAMESPACE_DECL)
-		{
-			xpath_obj->nodesetval->nodeTab[i] = NULL;
-		}
-	}
-
-	currencies[len].short_name = g_strdup("EUR");
-	MPNumber foo;
-	mp_set_from_integer(1, &foo);
-	currencies[len].value = foo;
-
-	xmlXPathFreeObject(xpath_obj);
-	xmlXPathFreeContext(xpath_ctx);
-	xmlFreeDoc(document);
-	xmlCleanupParser();
-
-	g_debug("Rates loaded");
-	loaded_rates = TRUE;
+void
+currency_set_value(Currency *currency, MPNumber *value)
+{
+    g_return_if_fail (currency != NULL);
+    g_return_if_fail (value != NULL);
+    mp_set_from_mp (value, &currency->priv->value);
 }
 
 
-gboolean currency_convert(const MPNumber* from_amount, const char* source_currency, const char* target_currency, MPNumber* to_amount)
+const MPNumber *
+currency_get_value(Currency *currency)
 {
-	int from_index, to_index;
-
-	if (downloading_rates)
-	{
-		return FALSE;
-	}
-
-	/* Update currency if necessary */
-	if (currency_rates_needs_update())
-	{
-		currency_download_rates();
-		return FALSE;
-	}
-
-	if (!loaded_rates)
-	{
-		currency_load_rates();
-	}
-
-	from_index = currency_get_index(source_currency);
-	to_index = currency_get_index(target_currency);
-
-	if (from_index < 0 || to_index < 0)
-	{
-		return FALSE;
-	}
-
-	if (mp_is_zero(&currencies[from_index].value) || mp_is_zero(&currencies[to_index].value))
-	{
-		mp_set_from_integer(0, to_amount);
-		return FALSE;
-	}
-
-	mp_divide(from_amount, &currencies[from_index].value, to_amount);
-	mp_multiply(to_amount, &currencies[to_index].value, to_amount);
-
-	return TRUE;
+    g_return_val_if_fail (currency != NULL, NULL);
+    return &currency->priv->value;
 }
 
-void currency_free_resources()
-{
-	int i;
 
-	for (i = 0; i < currency_count; i++)
-	{
-		if (currencies[i].short_name != NULL)
-		{
-			xmlFree(currencies[i].short_name);
-		}
-	}
+static void
+currency_class_init(CurrencyClass *klass)
+{
+    g_type_class_add_private(klass, sizeof(CurrencyPrivate));
+}
 
-	g_slice_free1(currency_count * sizeof(currency), currencies);
 
-	currencies = NULL;
-	currency_count = 0;
+static void
+currency_init(Currency *currency)
+{
+    currency->priv = G_TYPE_INSTANCE_GET_PRIVATE(currency, currency_get_type(), CurrencyPrivate);
 }