#[derive(Copy, Clone, PartialEq, Debug)]
pub enum Status
{
	Safe,
	Unsafe,
	Unknown,
}

#[derive(Clone, Debug)]
pub struct Report
{
	levels: Vec<i32>,
	status: Status,
	enable_dampener: bool,
}

//|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
//				IMPL Report
//|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
impl Report
{
	pub fn new(lvls: Vec<i32>, enable_dampener: bool) -> Report
	{
		Report { levels: lvls , status: Status::Unknown, enable_dampener }
	}


	pub fn analyze(self: &mut Report, enable_debug_prints: bool) -> Status
	{
		if self.enable_dampener
		{
			// Brute force the dampener thing
			let mut i = 0;
			let mut status = check_levels(&self.levels, enable_debug_prints);
			while i < self.levels.len() && status == Status::Unsafe
			{
				let mut levels = self.levels.clone();
				levels.remove(i);
				status = check_levels(&levels, enable_debug_prints);

				i += 1;
			}
			self.status = status;
		}
		else
		{
			self.status = check_levels(&self.levels, enable_debug_prints);
		}

		return self.status;
	}

	fn _try_dampen_level(self: &mut Report, at: usize, do_debug_prints: bool) -> bool
	{
		if !self.enable_dampener
		{
			return false;
		}

		if do_debug_prints
		{
			println!("Day 2 DEBUG: Bad level detected in report ({:#?}), using dampener to remove level: {}", self.levels, self.levels[at]);
		}

		self.levels.remove(at);
		self.enable_dampener = false;
		return true;
	}
}

//|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
//				HELPERS
//|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||

// SAFTY RULES:
// 		The levels are either all increasing or all decreasing.
// 		Any two adjacent levels differ by at least one and at most three.
fn check_levels(levels: &Vec<i32>, enable_debug_prints: bool) -> Status
{
	let mut prev_direction = 0;
	let mut i = 0;
	while i < levels.len() - 1 // Don't process the last level value	
	{
		let diff = levels[i] - levels[i + 1];
		let this_direction = if diff > 0 { 1 } else if diff < 0 { -1 } else { 0 };

		// diff check
		let diff = diff.abs();
		if diff > 3 || diff < 1
		{
			if enable_debug_prints
			{
				println!("Day 2 DEBUG: Report ({:#?}) is unsafe due to invalid value gap ({}): {} to {}", levels, diff, levels[i], levels[i + 1])
			}
			return Status::Unsafe;
		}

		// increase/decrease check
		if 0 == prev_direction
		{
			prev_direction = this_direction
		}		
		else
		{
			if prev_direction != this_direction
			{
				if enable_debug_prints
				{
					println!("Day 2 DEBUG: Report ({:#?}) is unsafe due to increase/decrease rule violation: {} to {}", levels, levels[i], levels[i + 1])
				}
				return Status::Unsafe;
			}
		}

		i += 1;
	}
	
	Status::Safe
}