use std::os::raw::*;

const MIN_BORDER_WIDTH: c_int = 0;
const MAX_BORDER_WIDTH: c_int = 10000;
const MIN_DEFAULT_CLIENTS_IN_MASTER: c_int = 1;
const MAX_DEFAULT_CLIENTS_IN_MASTER: c_int = 10000;
const MIN_GAP_SIZE: c_int = 0;
const MAX_GAP_SIZE: c_int = 10000;
const MIN_MASTER_AREA_FACTOR: c_float = 0.05;
const MAX_MASTER_AREA_FACTOR: c_float = 0.95;
const MIN_MAX_CLIENTS_IN_MASTER: c_int = 1;
const MAX_MAX_CLIENTS_IN_MASTER: c_int = 10000;
const MIN_SNAP_DISTANCE: c_uint = 1;
const MAX_SNAP_DISTANCE: c_uint = 10000;

pub fn border_width(border_width: c_int) -> c_int {
	if border_width < MIN_BORDER_WIDTH { return MIN_BORDER_WIDTH }
	if border_width > MAX_BORDER_WIDTH { return MAX_BORDER_WIDTH }
	border_width
}

pub fn default_clients_in_master(default_clients_in_master: c_int) -> c_int {
	if default_clients_in_master < MIN_DEFAULT_CLIENTS_IN_MASTER {
		return MIN_DEFAULT_CLIENTS_IN_MASTER
	}
	if default_clients_in_master > MAX_DEFAULT_CLIENTS_IN_MASTER {
		return MAX_DEFAULT_CLIENTS_IN_MASTER
	}
	default_clients_in_master
}

pub fn default_master_area_factor(default_master_area_factor: c_float) -> c_float {
	master_area_factor(default_master_area_factor)
}

pub fn gap_size(gap_size: c_int) -> c_int {
	if gap_size < MIN_GAP_SIZE { return MIN_GAP_SIZE }
	if gap_size > MAX_GAP_SIZE { return MAX_GAP_SIZE }
	gap_size
}

pub fn master_area_factor(master_area_factor: c_float) -> c_float {
	if master_area_factor < MIN_MASTER_AREA_FACTOR { return MIN_MASTER_AREA_FACTOR }
	if master_area_factor > MAX_MASTER_AREA_FACTOR { return MAX_MASTER_AREA_FACTOR }
	master_area_factor
}

pub fn max_clients_in_master(max_clients_in_master: c_int) -> c_int {
	if max_clients_in_master < MIN_MAX_CLIENTS_IN_MASTER {
		return MIN_MAX_CLIENTS_IN_MASTER
	}
	if max_clients_in_master > MAX_MAX_CLIENTS_IN_MASTER {
		return MAX_MAX_CLIENTS_IN_MASTER
	}
	max_clients_in_master
}

pub fn snap_distance(snap_distance: c_uint) -> c_uint {
	if snap_distance < MIN_SNAP_DISTANCE { return MIN_SNAP_DISTANCE }
	if snap_distance > MAX_SNAP_DISTANCE { return MAX_SNAP_DISTANCE }
	snap_distance
}

#[cfg(test)]
mod tests {
	use super::*;

	#[test]
	fn test_border_width() {
		assert_eq!(border_width(-1), 0);

		assert_eq!(border_width(0), 0);
		assert_eq!(border_width(10), 10);
		assert_eq!(border_width(10_000), 10_000);

		assert_eq!(border_width(10_001), 10_000);
		assert_eq!(border_width(20_000), 10_000);
	}

	#[test]
	fn test_default_clients_in_master() {
		assert_eq!(default_clients_in_master(-1), 1);
		assert_eq!(default_clients_in_master(0), 1);

		assert_eq!(default_clients_in_master(1), 1);
		assert_eq!(default_clients_in_master(2), 2);
		assert_eq!(default_clients_in_master(9999), 9999);
		assert_eq!(default_clients_in_master(10_000), 10_000);

		assert_eq!(default_clients_in_master(10_001), 10_000);
		assert_eq!(default_clients_in_master(20_000), 10_000);
	}

	#[test]
	fn test_gap_size() {
		assert_eq!(gap_size(-2), 0);
		assert_eq!(gap_size(-1), 0);

		assert_eq!(gap_size(0), 0);
		assert_eq!(gap_size(1), 1);
		assert_eq!(gap_size(100), 100);
		assert_eq!(gap_size(9999), 9999);
		assert_eq!(gap_size(10_000), 10_000);

		assert_eq!(gap_size(10_001), 10_000);
		assert_eq!(gap_size(20_000), 10_000);
	}

	#[test]
	fn test_max_clients_in_master() {
		assert_eq!(max_clients_in_master(-1), 1);
		assert_eq!(max_clients_in_master(0), 1);

		assert_eq!(max_clients_in_master(1), 1);
		assert_eq!(max_clients_in_master(2), 2);
		assert_eq!(max_clients_in_master(100), 100);
		assert_eq!(max_clients_in_master(9999), 9999);
		assert_eq!(max_clients_in_master(10_000), 10_000);

		assert_eq!(max_clients_in_master(10_001), 10_000);
		assert_eq!(max_clients_in_master(20_000), 10_000);
	}

	#[test]
	fn test_snap_distance() {
		assert_eq!(snap_distance(0), 1);

		assert_eq!(snap_distance(1), 1);
		assert_eq!(snap_distance(2), 2);
		assert_eq!(snap_distance(100), 100);
		assert_eq!(snap_distance(9999), 9999);
		assert_eq!(snap_distance(10_000), 10_000);

		assert_eq!(snap_distance(10_001), 10_000);
		assert_eq!(snap_distance(20_000), 10_000);
	}
}