136 lines
4.0 KiB
Ruby
136 lines
4.0 KiB
Ruby
# FrugalityBot
|
|
# Copyright (C) 2026 Eri (csxkdv/nxkdv) nxkdv@thenight.club
|
|
#
|
|
# 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 3 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# This program is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
|
|
require 'pg'
|
|
|
|
class Database
|
|
def initialize
|
|
# Connect once when the bot starts
|
|
@conn = PG.connect(
|
|
host: ENV['DB_HOST'] || 'localhost',
|
|
dbname: ENV['DB_NAME'] || 'fgbot_db',
|
|
user: ENV['DB_USER'] || 'postgres'
|
|
)
|
|
|
|
init_tables
|
|
end
|
|
|
|
def init_tables
|
|
sql_wallet = <<~SQL
|
|
CREATE TABLE IF NOT EXISTS wallets (
|
|
user_id BIGINT PRIMARY KEY,
|
|
amount BIGINT DEFAULT 0
|
|
);
|
|
SQL
|
|
|
|
sql_ledger = <<~SQL
|
|
CREATE TABLE IF NOT EXISTS transactions (
|
|
id SERIAL PRIMARY KEY,
|
|
user_id BIGINT NOT NULL,
|
|
amount BIGINT NOT NULL,
|
|
reason VARCHAR(50),
|
|
created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
|
|
);
|
|
SQL
|
|
|
|
sql_index = <<~SQL
|
|
CREATE INDEX IF NOT EXISTS idx_user_history
|
|
ON transactions(user_id, created_at);
|
|
SQL
|
|
|
|
@conn.exec(sql_wallet)
|
|
@conn.exec(sql_ledger)
|
|
@conn.exec(sql_index)
|
|
|
|
begin
|
|
@conn.exec("ALTER TABLE wallets ADD COLUMN IF NOT EXISTS locale VARCHAR(5) DEFAULT 'en'")
|
|
rescue PG::Error => e
|
|
puts "Migration note: #{e.message}"
|
|
end
|
|
|
|
puts "Database tables have been initialized."
|
|
end
|
|
|
|
def get_currency(user_id)
|
|
# Run the query using parameters ($1) to prevent SQL injection
|
|
result = @conn.exec_params("SELECT amount FROM wallets WHERE user_id = $1", [user_id])
|
|
|
|
if result.num_tuples.zero?
|
|
return 0 # User has no money/row yet
|
|
else
|
|
return result[0]['amount'].to_i
|
|
end
|
|
end
|
|
|
|
def update_balance(user_id, amount, reason = "transaction")
|
|
@conn.transaction do
|
|
@conn.exec_params(
|
|
"INSERT INTO transactions (user_id, amount, reason) VALUES ($1, $2, $3)",
|
|
[user_id, amount, reason]
|
|
)
|
|
|
|
# We update the user's wallet
|
|
sql_update = <<~SQL
|
|
INSERT INTO wallets (user_id, amount)
|
|
VALUES ($1, $2)
|
|
ON CONFLICT (user_id)
|
|
DO UPDATE SET amount = wallets.amount + $2
|
|
SQL
|
|
|
|
@conn.exec_params(sql_update, [user_id, amount])
|
|
end
|
|
end
|
|
|
|
def fetch_report(user_id, interval_string)
|
|
sql = <<~SQL
|
|
SELECT
|
|
SUM(CASE WHEN amount > 0 THEN amount ELSE 0 END) as income,
|
|
SUM(CASE WHEN amount < 0 THEN amount ELSE 0 END) as expenses,
|
|
SUM(amount) AS net_change
|
|
FROM transactions
|
|
WHERE user_id = $1
|
|
AND created_at >= NOW() - $2::INTERVAL
|
|
SQL
|
|
|
|
result = @conn.exec_params(sql, [user_id, interval_string])
|
|
row = result[0]
|
|
|
|
{
|
|
income: row['income'].to_i,
|
|
expenses: row['expenses'].to_i,
|
|
net: row['net_change'].to_i
|
|
}
|
|
end
|
|
|
|
def get_language(user_id)
|
|
result = @conn.exec("SELECT locale FROM wallets WHERE user_id = $1", [user_id])
|
|
|
|
return nil if result.num_tuples.zero?
|
|
|
|
return result[0]['locale']
|
|
end
|
|
|
|
def set_language(user_id, locale)
|
|
sql = <<~SQL
|
|
INSERT INTO wallets(user_id, amount, locale)
|
|
VALUES ($1, 0, $2)
|
|
ON CONFLICT (user_id)
|
|
DO UPDATE SET locale = $2
|
|
SQL
|
|
|
|
@conn.exec(sql, [user_id, locale])
|
|
end
|
|
end |