/*!
Console Variables.
*/

#![allow(unused)]

use pelite;
use pelite::pe32::{Rva, Pe, PeFile};
use pelite::pattern as pat;

//----------------------------------------------------------------

pub fn print(file: PeFile) {
	for cvar in &cvars(file).unwrap() {
		println!("{}!{:08X} {:08X} {}", cvar.dll_name, cvar.offset, cvar.flags, cvar.name);
	}
}

//----------------------------------------------------------------

pub struct ConVar<'a> {
	dll_name: &'a str,
	name: &'a str,
	desc: Option<&'a str>,
	default_string: &'a str,
	offset: Rva,
	flags: u32,
	min_value: Option<f32>,
	max_value: Option<f32>,
}

pub fn cvars<'a>(file: PeFile<'a>) -> pelite::Result<Vec<ConVar<'a>>> {
	let mut save = [0; 8];
	let dll_name = file.exports()?.dll_name()?.to_str().unwrap();
	let scanner = file.scanner();
	let mut cvars = Vec::new();

	// Match static constructors which call [`ConVar::Create`](https://github.com/ValveSoftware/source-sdk-2013/blob/master/mp/src/public/tier1/convar.h#L383)
	// This method is far from perfect. The linked list is created at runtime through a bunch of variations.

	// Variant: ConVar with description and without min/max values
	let pat3 = pat!("CC 68*{'} 68'???? 68*{'} 68*{'} B9*{'} E8$");
	let mut matches = file.scanner().matches_code(pat3);
	while matches.next(&mut save) {
		let min_value = None;
		let max_value = None;
		let desc = Some(file.derva_c_str(save[1]).unwrap().to_str().unwrap());
		let flags = file.derva_copy(save[2]).unwrap();
		let default_string = file.derva_c_str(save[3]).unwrap().to_str().unwrap();
		let name = file.derva_c_str(save[4]).unwrap().to_str().unwrap();
		let offset = save[5];
		cvars.push(ConVar { dll_name, name, desc, default_string, offset, flags, min_value, max_value });
	}

	// Variant: ConVar with description and with min/max values
	let pat4 = pat!("D905*{'} 51 D91C24 D905*{'} 6A01 51 D91C24 6A01 68*{'} 68'???? 68*{'} 68*{'} B9*{'} E8$");
	let mut matches = file.scanner().matches_code(pat4);
	while matches.next(&mut save) {
		let max_value = Some(file.derva_copy(save[1]).unwrap());
		let min_value = Some(file.derva_copy(save[2]).unwrap());
		let desc = Some(file.derva_c_str(save[3]).unwrap().to_str().unwrap());
		let flags = file.derva_copy(save[4]).unwrap();
		let default_string = file.derva_c_str(save[5]).unwrap().to_str().unwrap();
		let name = file.derva_c_str(save[6]).unwrap().to_str().unwrap();
		let offset = save[7];
		cvars.push(ConVar { dll_name, name, desc, default_string, offset, flags, min_value, max_value });
	}

	Ok(cvars)
}