reifydb_routine/function/text/

format_bytes.rs

// SPDX-License-Identifier: Apache-2.0
// Copyright (c) 2025 ReifyDB

use reifydb_core::value::column::{ColumnWithName, buffer::ColumnBuffer, columns::Columns};
use reifydb_type::value::{constraint::bytes::MaxBytes, container::utf8::Utf8Container, r#type::Type};

use crate::routine::{Function, FunctionKind, Routine, RoutineInfo, context::FunctionContext, error::RoutineError};

const IEC_UNITS: [&str; 6] = ["B", "KiB", "MiB", "GiB", "TiB", "PiB"];

pub(super) fn format_bytes_internal(bytes: i64, base: f64, units: &[&str]) -> String {
	if bytes == 0 {
		return "0 B".to_string();
	}

	let bytes_abs = bytes.unsigned_abs() as f64;
	let sign = if bytes < 0 {
		"-"
	} else {
		""
	};

	let mut unit_index = 0;
	let mut value = bytes_abs;

	while value >= base && unit_index < units.len() - 1 {
		value /= base;
		unit_index += 1;
	}

	if unit_index == 0 {
		format!("{}{} {}", sign, bytes_abs as i64, units[0])
	} else if value == value.floor() {
		format!("{}{} {}", sign, value as i64, units[unit_index])
	} else {
		let formatted = format!("{:.2}", value);
		let trimmed = formatted.trim_end_matches('0').trim_end_matches('.');
		format!("{}{} {}", sign, trimmed, units[unit_index])
	}
}

#[macro_export]
macro_rules! process_int_column {
	($container:expr, $row_count:expr, $base:expr, $units:expr) => {{
		let mut result_data = Vec::with_capacity($row_count);

		for i in 0..$row_count {
			if let Some(&value) = $container.get(i) {
				result_data.push(format_bytes_internal(value as i64, $base, $units));
			} else {
				result_data.push(String::new());
			}
		}

		ColumnBuffer::Utf8 {
			container: Utf8Container::new(result_data),
			max_bytes: MaxBytes::MAX,
		}
	}};
}

#[macro_export]
macro_rules! process_float_column {
	($container:expr, $row_count:expr, $base:expr, $units:expr) => {{
		let mut result_data = Vec::with_capacity($row_count);

		for i in 0..$row_count {
			if let Some(&value) = $container.get(i) {
				result_data.push(format_bytes_internal(value as i64, $base, $units));
			} else {
				result_data.push(String::new());
			}
		}

		ColumnBuffer::Utf8 {
			container: Utf8Container::new(result_data),
			max_bytes: MaxBytes::MAX,
		}
	}};
}

#[macro_export]
macro_rules! process_decimal_column {
	($container:expr, $row_count:expr, $base:expr, $units:expr) => {{
		let mut result_data = Vec::with_capacity($row_count);

		for i in 0..$row_count {
			if let Some(value) = $container.get(i) {
				// Truncate decimal to integer by parsing the integer part
				let s = value.to_string();
				let int_part = s.split('.').next().unwrap_or("0");
				let bytes = int_part.parse::<i64>().unwrap_or(0);
				result_data.push(format_bytes_internal(bytes, $base, $units));
			} else {
				result_data.push(String::new());
			}
		}

		ColumnBuffer::Utf8 {
			container: Utf8Container::new(result_data),
			max_bytes: MaxBytes::MAX,
		}
	}};
}

/// Formats bytes using binary units (1024-based: B, KiB, MiB, GiB, TiB, PiB)
pub struct FormatBytes {
	info: RoutineInfo,
}

impl Default for FormatBytes {
	fn default() -> Self {
		Self::new()
	}
}

impl FormatBytes {
	pub fn new() -> Self {
		Self {
			info: RoutineInfo::new("text::format_bytes"),
		}
	}
}

impl<'a> Routine<FunctionContext<'a>> for FormatBytes {
	fn info(&self) -> &RoutineInfo {
		&self.info
	}

	fn return_type(&self, _input_types: &[Type]) -> Type {
		Type::Utf8
	}

	fn execute(&self, ctx: &mut FunctionContext<'a>, args: &Columns) -> Result<Columns, RoutineError> {
		if args.len() != 1 {
			return Err(RoutineError::FunctionArityMismatch {
				function: ctx.fragment.clone(),
				expected: 1,
				actual: args.len(),
			});
		}

		let column = &args[0];
		let (data, bitvec) = column.unwrap_option();
		let row_count = data.len();

		let result_data = match data {
			ColumnBuffer::Int1(container) => process_int_column!(container, row_count, 1024.0, &IEC_UNITS),
			ColumnBuffer::Int2(container) => process_int_column!(container, row_count, 1024.0, &IEC_UNITS),
			ColumnBuffer::Int4(container) => process_int_column!(container, row_count, 1024.0, &IEC_UNITS),
			ColumnBuffer::Int8(container) => process_int_column!(container, row_count, 1024.0, &IEC_UNITS),
			ColumnBuffer::Uint1(container) => process_int_column!(container, row_count, 1024.0, &IEC_UNITS),
			ColumnBuffer::Uint2(container) => process_int_column!(container, row_count, 1024.0, &IEC_UNITS),
			ColumnBuffer::Uint4(container) => process_int_column!(container, row_count, 1024.0, &IEC_UNITS),
			ColumnBuffer::Uint8(container) => process_int_column!(container, row_count, 1024.0, &IEC_UNITS),
			ColumnBuffer::Float4(container) => {
				process_float_column!(container, row_count, 1024.0, &IEC_UNITS)
			}
			ColumnBuffer::Float8(container) => {
				process_float_column!(container, row_count, 1024.0, &IEC_UNITS)
			}
			ColumnBuffer::Decimal {
				container,
				..
			} => {
				process_decimal_column!(container, row_count, 1024.0, &IEC_UNITS)
			}
			other => {
				return Err(RoutineError::FunctionInvalidArgumentType {
					function: ctx.fragment.clone(),
					argument_index: 0,
					expected: vec![
						Type::Int1,
						Type::Int2,
						Type::Int4,
						Type::Int8,
						Type::Uint1,
						Type::Uint2,
						Type::Uint4,
						Type::Uint8,
						Type::Float4,
						Type::Float8,
						Type::Decimal,
					],
					actual: other.get_type(),
				});
			}
		};

		let final_data = match bitvec {
			Some(bv) => ColumnBuffer::Option {
				inner: Box::new(result_data),
				bitvec: bv.clone(),
			},
			None => result_data,
		};
		Ok(Columns::new(vec![ColumnWithName::new(ctx.fragment.clone(), final_data)]))
	}
}

impl Function for FormatBytes {
	fn kinds(&self) -> &[FunctionKind] {
		&[FunctionKind::Scalar]
	}
}

pub(super) use process_decimal_column;
pub(super) use process_float_column;
pub(super) use process_int_column;