#!/bin/bash

DB_FILE="finance.db"
HISTORY_TABLE="finance_history"
# Current date in the format you've been using
DATE_STR=$(date +%Y-%m-%d)

# 1. Identify which table exists (finance or finance_data)
SRC_TABLE=finance

if [ -z "$SRC_TABLE" ]; then
    echo "Error: Source table not found."
    exit 1
fi

# 2. Get columns dynamically (excluding 'id')
COLS=$(sqlite3 "$DB_FILE" "PRAGMA table_info($SRC_TABLE);" | cut -d'|' -f2 | grep -v '^id$' | xargs | tr ' ' ',')

# 3. Change Detection Logic
# We grab the latest row from history and compare it to the current source data
CURRENT_VALS=$(sqlite3 "$DB_FILE" "SELECT $COLS FROM $SRC_TABLE ORDER BY id DESC LIMIT 1;")
LAST_VALS=$(sqlite3 "$DB_FILE" "SELECT $COLS FROM $HISTORY_TABLE ORDER BY snapshot_date DESC LIMIT 1;")

if [ "$CURRENT_VALS" == "$LAST_VALS" ]; then
    echo "Data identical to last snapshot ($DATE_STR). Skipping."
    exit 0
fi

# 4. Auto-Migration
# Ensure any new columns in 'finance' also exist in 'finance_history'
for col in ${COLS//,/ }; do
    sqlite3 "$DB_FILE" "ALTER TABLE $HISTORY_TABLE ADD COLUMN $col NUMERIC;" 2>/dev/null
done

# 5. The Snapshot Insert
# INSERT OR IGNORE ensures that if Docker restarts today, we don't duplicate the row.
echo "Changes detected. Recording snapshot for $DATE_STR..."
sqlite3 "$DB_FILE" <<EOF
INSERT OR IGNORE INTO $HISTORY_TABLE (snapshot_date, $COLS)
SELECT '$DATE_STR', $COLS FROM $SRC_TABLE ORDER BY id DESC LIMIT 1;
EOF