use std::path::Path;

use mime_guess::Mime;

use crate::inspectors::mime_extension_lookup;
use crate::string_type::String;

#[cfg(feature = "json")]
use serde::{ser::SerializeStruct, Serializer};

/// Information about a scanned file.
#[derive(Ord, PartialOrd, Eq, PartialEq)]
pub struct Findings<'a> {
	/// The location of the scanned file.
	pub file: &'a Path,
	/// Whether or not the file's extension is valid for its mimetype.
	pub valid: bool,
	/// The file's mimetype.
	pub mime: Mime,
}

#[cfg(feature = "json")]
impl<'a> serde::Serialize for Findings<'a> {
	fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
	where
		S: Serializer,
	{
		// the second parameter is the number of fields in the struct -- in this case, 3
		let mut state = serializer.serialize_struct("Findings", 3)?;

		state.serialize_field("file", &self.file)?;
		state.serialize_field("valid", &self.valid)?;
		state.serialize_field("mime", &self.mime.essence_str())?;
		state.end()
	}
}

impl<'a> Findings<'a> {
	pub fn recommended_extension(&self) -> Option<String> {
		mime_extension_lookup(self.mime.clone()).map(|extensions| extensions[0].clone())
	}
}