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use crate::read_7_bit_encoded_i32::Read7BitEncodedI32Ext;
use std::io;

pub trait ReadCsStrExt {
	fn read_cs_string(&mut self) -> io::Result<String>;
}

impl<T: io::Read> ReadCsStrExt for T {
	fn read_cs_string(&mut self) -> io::Result<String> {
		let size = self.read_7_bit_encoded_i32()?;
		let mut buf = vec![0u8; size as usize];
		self.read_exact(&mut buf)?;
		match String::from_utf8(buf) {
			Ok(v) => Ok(v),
			Err(e) => Err(io::Error::new(io::ErrorKind::Other, e)),
		}
	}
}

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

	#[test]
	fn reading_cs_strings() {
		let arr: [u8; 580] = [
			0x00, 0x01, 0x61, 0x80, 0x02, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
			0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
			0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
			0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
			0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
			0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
			0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
			0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
			0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
			0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
			0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
			0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
			0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
			0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
			0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
			0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
			0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
			0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
			0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x04, 0xf0, 0x9f, 0x93, 0xae,
			0xb8, 0x02, 0xf0, 0x9f, 0x8f, 0xb4, 0xe2, 0x80, 0x8d, 0xe2, 0x98, 0xa0, 0xef, 0xb8,
			0x8f, 0xf0, 0x9f, 0x8f, 0xb4, 0xe2, 0x80, 0x8d, 0xe2, 0x98, 0xa0, 0xef, 0xb8, 0x8f,
			0xf0, 0x9f, 0x8f, 0xb4, 0xe2, 0x80, 0x8d, 0xe2, 0x98, 0xa0, 0xef, 0xb8, 0x8f, 0xf0,
			0x9f, 0x8f, 0xb4, 0xe2, 0x80, 0x8d, 0xe2, 0x98, 0xa0, 0xef, 0xb8, 0x8f, 0xf0, 0x9f,
			0x8f, 0xb4, 0xe2, 0x80, 0x8d, 0xe2, 0x98, 0xa0, 0xef, 0xb8, 0x8f, 0xf0, 0x9f, 0x8f,
			0xb4, 0xe2, 0x80, 0x8d, 0xe2, 0x98, 0xa0, 0xef, 0xb8, 0x8f, 0xf0, 0x9f, 0x8f, 0xb4,
			0xe2, 0x80, 0x8d, 0xe2, 0x98, 0xa0, 0xef, 0xb8, 0x8f, 0xf0, 0x9f, 0x8f, 0xb4, 0xe2,
			0x80, 0x8d, 0xe2, 0x98, 0xa0, 0xef, 0xb8, 0x8f, 0xf0, 0x9f, 0x8f, 0xb4, 0xe2, 0x80,
			0x8d, 0xe2, 0x98, 0xa0, 0xef, 0xb8, 0x8f, 0xf0, 0x9f, 0x8f, 0xb4, 0xe2, 0x80, 0x8d,
			0xe2, 0x98, 0xa0, 0xef, 0xb8, 0x8f, 0xf0, 0x9f, 0x8f, 0xb4, 0xe2, 0x80, 0x8d, 0xe2,
			0x98, 0xa0, 0xef, 0xb8, 0x8f, 0xf0, 0x9f, 0x8f, 0xb4, 0xe2, 0x80, 0x8d, 0xe2, 0x98,
			0xa0, 0xef, 0xb8, 0x8f, 0xf0, 0x9f, 0x8f, 0xb4, 0xe2, 0x80, 0x8d, 0xe2, 0x98, 0xa0,
			0xef, 0xb8, 0x8f, 0xf0, 0x9f, 0x8f, 0xb4, 0xe2, 0x80, 0x8d, 0xe2, 0x98, 0xa0, 0xef,
			0xb8, 0x8f, 0xf0, 0x9f, 0x8f, 0xb4, 0xe2, 0x80, 0x8d, 0xe2, 0x98, 0xa0, 0xef, 0xb8,
			0x8f, 0xf0, 0x9f, 0x8f, 0xb4, 0xe2, 0x80, 0x8d, 0xe2, 0x98, 0xa0, 0xef, 0xb8, 0x8f,
			0xf0, 0x9f, 0x8f, 0xb4, 0xe2, 0x80, 0x8d, 0xe2, 0x98, 0xa0, 0xef, 0xb8, 0x8f, 0xf0,
			0x9f, 0x8f, 0xb4, 0xe2, 0x80, 0x8d, 0xe2, 0x98, 0xa0, 0xef, 0xb8, 0x8f, 0xf0, 0x9f,
			0x8f, 0xb4, 0xe2, 0x80, 0x8d, 0xe2, 0x98, 0xa0, 0xef, 0xb8, 0x8f, 0xf0, 0x9f, 0x8f,
			0xb4, 0xe2, 0x80, 0x8d, 0xe2, 0x98, 0xa0, 0xef, 0xb8, 0x8f, 0xf0, 0x9f, 0x8f, 0xb4,
			0xe2, 0x80, 0x8d, 0xe2, 0x98, 0xa0, 0xef, 0xb8, 0x8f, 0xf0, 0x9f, 0x8f, 0xb4, 0xe2,
			0x80, 0x8d, 0xe2, 0x98, 0xa0, 0xef, 0xb8, 0x8f, 0xf0, 0x9f, 0x8f, 0xb4, 0xe2, 0x80,
			0x8d, 0xe2, 0x98, 0xa0, 0xef, 0xb8, 0x8f, 0xf0, 0x9f, 0x8f, 0xb4, 0xe2, 0x80, 0x8d,
			0xe2, 0x98, 0xa0, 0xef, 0xb8, 0x8f,
		];
		let mut reader = ReadByteArr::new(&arr);
		assert_eq!(reader.read_cs_string().unwrap(), "");
		assert_eq!(reader.read_cs_string().unwrap(), "a");
		assert_eq!(reader.read_cs_string().unwrap(), "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA");
		assert_eq!(reader.read_cs_string().unwrap(), "📮");
		assert_eq!(
			reader.read_cs_string().unwrap(),
			"🏴‍☠️🏴‍☠️🏴‍☠️🏴‍☠️🏴‍☠️🏴‍☠️🏴‍☠️🏴‍☠️🏴‍☠️🏴‍☠️🏴‍☠️🏴‍☠️🏴‍☠️🏴‍☠️🏴‍☠️🏴‍☠️🏴‍☠️🏴‍☠️🏴‍☠️🏴‍☠️🏴‍☠️🏴‍☠️🏴‍☠️🏴‍☠️"
		);
	}

	#[test]
	fn invalid_string_size() {
		let arr: [u8; 2] = [0x7F, 0x41];
		let mut reader = ReadByteArr::new(&arr);
		assert_eq!(
			reader.read_cs_string().map_err(|e| e.kind()),
			Err(io::ErrorKind::UnexpectedEof)
		);
	}

	#[test]
	fn invalid_string() {
		let arr: [u8; 2] = [0x1, 0x80];
		let mut reader = ReadByteArr::new(&arr);
		assert_eq!(
			reader.read_cs_string().map_err(|e| e.kind()),
			Err(io::ErrorKind::Other)
		);
	}
}