use std::fs; // For reading the map and save files
use crate::Coordinates;

// This function reads the map file and puts it into a 2d vector of integers, each integer 
// Refers to a block (see top comment) and the function returns this vector
pub fn parse_map(player_coordinates: &Coordinates) -> Result<(Vec<Vec<char>>, Vec<Vec<char>>), u8> 
{
	let mut ground_map: Vec<Vec<char>> = Vec::new(); // Initialises the Ground map vector
	let mut above_map: Vec<Vec<char>> = Vec::new(); // Initialises the Above Ground map vector
	let ground_file = format!("data/{}_ground.map",player_coordinates.map);
	let above_file = format!("data/{}_above.map",player_coordinates.map);

	// Read the ground map file
	if let Ok(parsed_ground_file_contents) = fs::read_to_string(&ground_file) 
	{
		let ground_file_contents = parsed_ground_file_contents;
		let ground_rows = ground_file_contents.split("\n").collect::<Vec<_>>(); // Split the file contents into rows

		// Loop over each row to parse each column of it
		for row in 0..ground_rows.len() 
		{
			// Turn each column into an integer and collect it into a row vector
			let current_row = ground_rows[row].chars().collect();
			ground_map.push(current_row); // Then push this vector to the full map vector
		}
	}
	else 
	{
		eprintln!("Error: Could not read file: {}", ground_file);
		return Err(1)
	}
	// Read the above ground map file
	if let Ok(parsed_above_file_contents) = fs::read_to_string(&above_file) 
	{
		let above_file_contents = parsed_above_file_contents;
		let above_rows = above_file_contents.split("\n").collect::<Vec<_>>(); // Split the file contents into rows

		// Loop over each row to parse each column of it
		for row in 0..above_rows.len() 
		{
			// Turn each column into an integer and collect it into a row vector
			let current_row = above_rows[row].chars().collect();
			above_map.push(current_row); // Then push this vector to the full map vector
		}
	}
	else 
	{
		eprintln!("Error: Could not read file: {}", ground_file);
		return Err(1)
	}

	return Ok((ground_map, above_map))
}