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use std::cell::LazyCell;
use crate::core::{column::Column, db_type::DbType};
use super::models::{ComparerOperation, MathOperation, Next, Token};
const ZERO_VALUE: LazyCell<Column> = LazyCell::new(|| Column::new(0).unwrap());
pub(crate) fn evaluate_column_result(
required_columns: &mut Vec<(u32, Column)>,
evaluation_tokens: &mut Vec<(Vec<Token>, Option<Next>)>,
token_results: &mut Vec<(bool, Option<Next>)>,
) -> bool {
let mut iter = evaluation_tokens.iter_mut();
while let Some(tokens) = iter.next() {
let mut current_value: Option<Column> = None;
let mut token_iter = tokens.0.iter_mut();
let evalaution_result = loop {
if let Some(token) = token_iter.next() {
match token {
Token::Column(column_id) => {
// Get the value associated with the column_id
if let Some((_, column)) =
required_columns.iter().find(|(id, _)| *id == *column_id)
{
current_value = Some(column.clone());
} else {
continue; // Column ID not found
}
}
Token::Math(operation) => {
if let Some(ref mut left_value) = current_value.as_mut() {
// Get the next token for the right operand
let iter_result = token_iter.next();
if let Some(Token::Value(column)) = iter_result {
if column.data_type == DbType::TBD {
column.into_regular(left_value.data_type.clone());
}
let right_value = column;
// Perform the math operation
match operation {
MathOperation::Add => left_value.add(&right_value),
MathOperation::Subtract => left_value.subtract(&right_value),
MathOperation::Multiply => left_value.multiply(&right_value),
MathOperation::Divide => {
if right_value.equals(&ZERO_VALUE) {
panic!("Division with zero is not allowed.")
}
left_value.divide(&right_value)
}
_ => todo!(),
};
} else if let Some(Token::Column(column)) = iter_result {
let right_value = column;
if let Some((_, column)) = required_columns
.iter_mut()
.find(|(id, _)| *id == *right_value)
{
if column.data_type == DbType::TBD {
column.into_regular(left_value.data_type.clone());
}
let right_value = column;
// Perform the math operation
match operation {
MathOperation::Add => left_value.add(&right_value),
MathOperation::Subtract => {
left_value.subtract(&right_value)
}
MathOperation::Multiply => {
left_value.multiply(&right_value)
}
MathOperation::Divide => {
if right_value.equals(&ZERO_VALUE) {
panic!("Division with zero is not allowed.")
}
left_value.divide(&right_value)
}
_ => todo!(),
};
} else {
continue; // Column ID not found
}
} else {
continue; // Missing operand
}
} else {
continue;
}
}
Token::Operation(op) => {
if let Some(ref mut left_value) = current_value.as_mut() {
let next_token = token_iter.next();
// Get the next token for the right operand
if let Some(Token::Value(ref mut column)) = next_token {
if column.data_type == DbType::TBD {
column.into_regular(left_value.data_type.clone());
}
let right_value = column;
// Perform the comparison
let result = match op {
ComparerOperation::Equals => left_value.equals(&right_value),
ComparerOperation::NotEquals => {
left_value.not_equal(&right_value)
}
ComparerOperation::Greater => {
left_value.greater_than(&right_value)
}
ComparerOperation::Less => left_value.less_than(&right_value),
ComparerOperation::GreaterOrEquals => {
left_value.greater_or_equals(&right_value)
}
ComparerOperation::LessOrEquals => {
left_value.less_or_equals(&right_value)
}
ComparerOperation::Contains => {
left_value.contains(&right_value)
}
ComparerOperation::StartsWith => {
left_value.starts_with(&right_value)
}
ComparerOperation::EndsWith => {
left_value.ends_with(&right_value)
}
};
break result; // Return the result of the comparison
} else if let Some(Token::Column(ref mut column)) = next_token {
let right_value = column;
if let Some((_, ref mut column)) = required_columns
.iter_mut()
.find(|(id, _)| *id == *right_value)
{
if column.data_type == DbType::TBD {
column.into_regular(left_value.data_type.clone());
}
let right_value = column;
// Perform the comparison
let result = match op {
ComparerOperation::Equals => {
left_value.equals(&right_value)
}
ComparerOperation::NotEquals => {
left_value.not_equal(&right_value)
}
ComparerOperation::Greater => {
left_value.greater_than(&right_value)
}
ComparerOperation::Less => {
left_value.less_than(&right_value)
}
ComparerOperation::GreaterOrEquals => {
left_value.greater_or_equals(&right_value)
}
ComparerOperation::LessOrEquals => {
left_value.less_or_equals(&right_value)
}
ComparerOperation::Contains => {
left_value.contains(&right_value)
}
ComparerOperation::StartsWith => {
left_value.starts_with(&right_value)
}
ComparerOperation::EndsWith => {
left_value.ends_with(&right_value)
}
};
break result;
} else {
continue; // Column ID not found
}
} else {
continue;
}
} else {
continue; // Missing left operand
}
}
Token::Value(ref mut column_value) => {
current_value = Some(column_value.clone());
}
}
} else {
break false;
}
};
token_results.push((evalaution_result, tokens.1.clone()));
}
let mut final_result = false;
let total_results_len = token_results.len();
if token_results.len() > 1 {
let mut previous: Next = Next::And;
let mut next_one: Next = Next::And;
for first in token_results.iter().take(1) {
final_result = first.0;
previous = first.1.clone().unwrap();
}
for token_result in token_results.iter().skip(1).take(total_results_len - 2) {
if let Some(next) = token_result.1.clone() {
if previous == Next::And {
final_result = final_result && token_result.0;
} else {
final_result = final_result || token_result.0;
}
previous = next_one;
next_one = next;
}
}
for last in token_results.iter().skip(total_results_len - 1).take(1) {
if next_one == Next::And {
final_result = final_result && last.0;
} else {
final_result = final_result || last.0;
}
}
} else {
for token_result in token_results {
final_result = token_result.0;
}
}
final_result // Default to false if no comparison was made
}