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pub mod assembly;
pub mod csharp;
pub mod csv;
pub mod hpp;
pub mod output;
pub mod rust;

use assembly::Assembly;
use csharp::CSharp;
use csv::Csv;
use hpp::Hpp;
use rust::Rust;

use core::fmt;

use std::{
  ffi::OsStr,
  fs::File,
  io::{self, BufRead},
  path::Path,
};

extern crate log;

pub struct CodeGen {
  pub file_path: String,
  pub export_path: String,
  pub input_file_type: ParseTargets,
  pub export_file_type: WriteTargets,
  pub data: ParsedData,
}

pub enum ParseTargets {
  UNKNOWN,
  HPP,
  CSV,
}

pub enum WriteTargets {
  ASM,
  CSHARP,
  CSV,
  RUST,
}

fn get_extension_from_filename(filename: &str) -> Option<&str> {
  Path::new(filename).extension().and_then(OsStr::to_str)
}

fn get_type_from_extension(extension: &str) -> ParseTargets {
  match extension {
    "hpp" => ParseTargets::HPP,
    "csv" => ParseTargets::CSV,
    _ => ParseTargets::UNKNOWN,
  }
}

fn get_type(file_path: &str) -> ParseTargets {
  get_type_from_extension(get_extension_from_filename(file_path).unwrap())
}

#[derive(Clone)]
pub struct NwOffset {
  pub name: String,
  pub offset: String,
}

#[derive(Clone)]
pub enum Platform {
  X86,
  ARM,
  UNDEFINED,
}

impl Platform {
  pub fn from_str(s: &str) -> Platform {
    match s {
      "x86" => Platform::X86,
      "arm" => Platform::ARM,
      "X86" => Platform::X86,
      "ARM" => Platform::ARM,
      _ => Platform::UNDEFINED,
    }
  }
}

impl fmt::Display for Platform {
  fn fmt(&self,
         f: &mut fmt::Formatter)
         -> fmt::Result {
    match self {
      Platform::X86 => write!(f, "X86"),
      Platform::ARM => write!(f, "ARM"),
      Platform::UNDEFINED => write!(f, "UNDEFINED"),
    }
  }
}

pub struct ParsedData {
  pub major_version: u16,
  pub minor_version: u16,
  pub platform: Platform,
  pub offsets: Vec<NwOffset>,
}

impl CodeGen {
  pub fn new(input_file_path: &String,
             export_path: &String,
             _type: WriteTargets)
             -> Self {
    let input_file_type = get_type(input_file_path);
    let data: ParsedData = match input_file_type {
      ParseTargets::UNKNOWN => {
        println!("Unknown file type");
        ParsedData { major_version: 0,
                     minor_version: 0,
                     platform: Platform::UNDEFINED,
                     offsets: Vec::new() }
      }
      ParseTargets::HPP => {
        println!("Parsing hpp file");
        Hpp::parse(input_file_path, hpp::Type::Functions)
      }
      ParseTargets::CSV => {
        println!("Parsing csv file");
        Csv::parse(input_file_path)
      }
    };

    CodeGen { file_path: input_file_path.to_owned(),
              export_path: export_path.to_owned(),
              data,
              input_file_type: input_file_type,
              export_file_type: _type }
  }

  pub fn write(&self) {
    match self.export_file_type {
      WriteTargets::ASM => {
        Assembly::write(&self.data, &self.export_path);
      }
      WriteTargets::CSHARP => {
        CSharp::write(&self.data, &self.export_path);
      }
      WriteTargets::CSV => {
        Csv::write(&self.data, &self.export_path);
      }
      WriteTargets::RUST => {
        Rust::write(&self.data, &self.export_path);
      }
    };
  }
}

pub fn read_lines<P>(filename: P) -> io::Result<io::Lines<io::BufReader<File>>>
  where P: AsRef<Path>
{
  let file = File::open(filename)?;
  Ok(io::BufReader::new(file).lines())
}