1 files changed, 162 insertions, 0 deletions
diff --git a/utils/register.py b/utils/register.py
new file mode 100644
index 0000000..96bcd3c
--- /dev/null
+++ b/utils/register.py
@@ -0,0 +1,162 @@
+from utils.read_file import entry
+from typing import List, Iterator
+
+import re
+import shutil
+
+
+class currencies:
+    """
+    Store various currencies and add or subtract them.
+    """
+    def __init__(self) -> None:
+        # The keys of the dictionary will be the currency symbol. The value of
+        # the dictionary will be a float number, representing the amount.
+        self.money = dict()
+
+
+    def __retrieve_number(self, price: str) -> float:
+        """
+        Given a string, extract the number from it. The number is defined by a
+        consecutive string of digits, with maybe a dot in between or end of it.
+        """
+        result = re.findall(r'\d+(?:\.\d*)?', price)[0]
+        result = float(result)
+
+        # If it has the minus symbol (-), it must be a negative value.
+        if '-' in price:
+            return -result
+        else:
+            return result
+
+    def __retrieve_currency(self, price: str) -> str:
+        """
+        Given a string, remove the number and maybe a negative symbol from it.
+        The resulting string is most likely the currency symbol.
+        """
+        number = re.findall(r'\d+(?:\.\d*)?', price)[0]
+        result = price.replace(number, '')
+        result = result.replace('-', '')
+
+        return result.strip()
+
+    
+    def add_money(self, price: str) -> None:
+        """
+        Add money to our "wallet." If it is a currency we already have, sum the
+        values. If the currency is new, create the entry on our dictionary and
+        assign the amount to it.
+
+        On the other hand, if the amount is equal to 0, delete the currency
+        entry.
+        """
+        number = self.__retrieve_number(price)
+        currency = self.__retrieve_currency(price)
+
+        if currency in self.money:
+            self.money[currency] += number
+        else:
+            self.money[currency] = number
+
+        if self.money[currency] == 0:
+            del self.money[currency]
+
+    
+    def __iter__(self) -> Iterator[str]:
+        """
+        When iterating through our currencies, yield the already formatted
+        currencies. If there are not currencies, just return a 0.
+        """
+        if not self.money:
+            yield '0'
+        for currency, number in self.money.items():
+            if len(currency) == 1:
+                yield f'{currency}{number:.02f}'
+            else:
+                yield f'{number:.02f} {currency}'
+
+
+    # What to do if we do "-currencies"?
+    def __neg__(self):
+        negated = currencies()
+        for currency, number in self.money.items():
+            negated.add_money(f'{currency} {-number}')
+
+        return negated
+
+
+def complete_prices(my_entry: entry):
+    """
+    Transform all string of prices to the class `currencies`. If there is an
+    entry that has no price, balance the transaction so the sum is equal to 0.
+    """
+    idx_not_complete = -1
+    money_to_bal = currencies()
+
+    for idx in range(len(my_entry.transactions)):
+        if (len(my_entry.transactions[idx]) == 1):
+            idx_not_complete = idx
+        else:
+            _, price = my_entry.transactions[idx]
+            money_to_bal.add_money(price)
+
+            new_price_format = currencies()
+            new_price_format.add_money(price)
+            my_entry.transactions[idx][1] = new_price_format
+
+    if idx_not_complete != -1:
+        my_entry.transactions[idx_not_complete].append(
+            -money_to_bal
+        )
+
+
+def print_register(entries: List[entry]):
+    width_term, _ = shutil.get_terminal_size(fallback=(80, 24))
+    # We will divide the terminal width in the following way:
+    # - Date and Comment: 37/100 parts of the terminal width.
+    # - Account name: 31/100 parts of the terminal width.
+    # - First price column: 16/100 parts of the terminal width.
+    # - Second price column: 16/100 parts of the terminal width.
+    # NOTE: We reserve 3 spaces of the terminal width to help separate the
+    # columns.
+    d_c_len = int((width_term - 3) * 37 / 100); d_c_len = max(d_c_len, 15)
+    acc_len = int((width_term - 3) * 31 / 100); acc_len = max(acc_len, 6)
+    p_1_len = int((width_term - 3) * 16 / 100)
+    p_2_len = int((width_term - 3) * 16 / 100)
+
+    result = ''
+    current_money = currencies()
+
+    for ent in entries:
+        complete_prices(ent)
+
+        date_comment = ent.date.strftime('%y-%b-%d ')
+        date_comment += ent.comment
+        if len(date_comment) > d_c_len:
+            date_comment = date_comment[:d_c_len - 2] + '..'
+
+        result += f'{date_comment:<{d_c_len}} '
+
+        for trans in ent.transactions:
+            account = trans[0]
+            if len(account) > acc_len:
+                account = '..' + account[-(acc_len - 2):]
+            result += f'{account:<{acc_len}} '
+
+            for price in trans[1]:
+                result += f'{price:>{p_1_len}} '
+
+                current_money.add_money(price)
+                for curr_price in current_money:
+                    result += f'{curr_price:>{p_2_len}}\n'
+                    result += ' ' * (d_c_len + 1 + acc_len + 1 + p_1_len + 1)
+
+                result = result.rstrip() + '\n'
+                result += ' ' * (d_c_len + 1 + acc_len + 1)
+
+            result = result.rstrip() + '\n'
+            result += ' ' * (d_c_len + 1)
+
+        result = result.rstrip() + '\n'
+
+    print(result.rstrip())