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use std::borrow::Cow;
use std::path::Path;
use std::str::FromStr;
use regex::Regex;


/// Represents a device serial number.
/// e.g.: PDU1-Y000235
#[derive(Clone)]
pub struct SerialNumber(String);


impl SerialNumber {
	pub fn contained_in<S: AsRef<str>>(s: S) -> Option<Self> {
		pub const REGEX_NAME: &str = r"^.*(PDU\d+[_-][a-zA-Z0-9]+).*$";
		let re = Regex::new(REGEX_NAME).expect("invalid regex");
		let captures = re.captures(s.as_ref())?;
		let serial = Self::unify(captures.get(1)?.as_str());
		let serial = if serial.contains('_') {
			serial.replace('_', "-")
		} else {
			serial.to_string()
		};

		Some(Self(serial.to_owned()))
	}


	fn unify<'s, S: Into<Cow<'s, str>>>(s: S) -> Cow<'s, str> {
		let s = s.into();
		if s.contains('_') {
			s.replace('_', "-").into()
		} else {
			s
		}
	}
}

impl FromStr for SerialNumber {
	type Err = error::SerialNumberFormatError;
	fn from_str(s: &str) -> Result<Self, Self::Err> {
		Self::contained_in(s).ok_or_else(|| error::SerialNumberFormatError::from(s))
	}
}


impl TryFrom<String> for SerialNumber {
	type Error = <Self as FromStr>::Err;
	fn try_from(value: String) -> Result<Self, Self::Error> { Self::from_str(value.as_str()) }
}

impl TryFrom<&str> for SerialNumber {
	type Error = <Self as FromStr>::Err;
	fn try_from(value: &str) -> Result<Self, Self::Error> { Self::from_str(value) }
}

impl TryFrom<&Path> for SerialNumber {
	type Error = <Self as FromStr>::Err;
	fn try_from(value: &Path) -> Result<Self, Self::Error> { Self::from_str(value.to_string_lossy().as_ref()) }
}


impl PartialEq for SerialNumber {
	fn eq(&self, other: &Self) -> bool { self.0.contains(&other.0) || other.0.contains(&self.0) }
}

impl<T: AsRef<str>> PartialEq<T> for SerialNumber {
	fn eq(&self, other: &T) -> bool {
		let other = other.as_ref().to_uppercase();
		self.0.contains(&other) || other.contains(&self.0)
	}
}

impl std::fmt::Debug for SerialNumber {
	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
		f.debug_tuple("Serial").field(&self.0).finish()
	}
}

impl std::fmt::Display for SerialNumber {
	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { write!(f, "{}", self.0) }
}


pub mod error {

	use std::backtrace::Backtrace;
	use thiserror::Error;
	use miette::Diagnostic;


	#[derive(Error, Debug, Diagnostic)]
	#[error("invalid serial number `{value}`, expected format `PDUN-XNNNNNN`.")]
	pub struct SerialNumberFormatError {
		pub value: String,
		#[backtrace]
		backtrace: Backtrace,
	}

	impl SerialNumberFormatError {
		fn new(value: String) -> Self {
			Self { value,
			       backtrace: Backtrace::capture() }
		}
	}

	impl From<String> for SerialNumberFormatError {
		fn from(value: String) -> Self { Self::new(value) }
	}

	impl From<&str> for SerialNumberFormatError {
		fn from(value: &str) -> Self { Self::new(value.to_owned()) }
	}
}