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#![warn(trivial_numeric_casts)]

extern crate ansi_term;
extern crate ascii;
extern crate getopts;
extern crate itertools;
extern crate llvm_sys;
extern crate matches;
extern crate pest;
extern crate quickcheck;
extern crate rand;
extern crate regex;
extern crate tempfile;

#[macro_use]
extern crate pest_derive;
extern crate core;

pub mod compiler;
pub mod parser;
pub mod shell;
pub mod parser_combinator;

use getopts::Options;
use std::fs;
use std::path::Path;
use tempfile::NamedTempFile;

/// Convert "foo.ijs" to "foo".
fn executable_name(ijs_path: &str) -> String {
    let bf_file_name = Path::new(ijs_path).file_name().unwrap().to_str().unwrap();

    let mut name_parts: Vec<_> = bf_file_name.split('.').collect();
    let parts_len = name_parts.len();
    if parts_len > 1 {
        name_parts.pop();
    }

    name_parts.join(".")
}

pub fn print_usage(bin_name: &str, opts: Options) {
    let brief = format!("Usage: {} SOURCE_FILE [options]", bin_name);
    print!("{}", opts.usage(&brief));
}

fn convert_io_error<T>(result: Result<T, std::io::Error>) -> Result<T, String> {
    match result {
        Ok(value) => Ok(value),
        Err(e) => Err(format!("{}", e)),
    }
}

pub fn compile(
    path: &str,
    target_triple: Option<String>,
    llvm_optimization_level: u8,
    do_strip_executable: bool,
    do_report_mem_usage: bool,
    do_verbose: bool,
    output_path: Option<String>,
) -> Result<(), String> {
    let jsrc = fs::read_to_string(path).expect("cannot open source of provided J program");

    let ast = match parser_combinator::parse(&jsrc[..]) {
        Ok(astnodes) => astnodes,
        Err(parse_error) => {
            panic!("{}", parse_error);
        }
    };
    println!("{:?}", ast);

//    let ast = match parser::parse(&jsrc[..]) {
//        Ok(instrs) => instrs,
//        Err(parse_error) => {
//            panic!("{}", parse_error);
//        }
//    };
//
//    if do_verbose {
//        for astnode in &ast {
//            println!("{:?}", astnode);
//        }
//    }
//
//    let mut llvm_module =
//        compiler::compile_to_module(path, target_triple.clone(), do_report_mem_usage, &ast);
//
//    compiler::optimise_ir(&mut llvm_module, llvm_optimization_level as i64);
//    let llvm_ir_cstr = llvm_module.to_cstring();
//    let llvm_ir = String::from_utf8_lossy(llvm_ir_cstr.as_bytes());
//
//    if do_verbose {
//        println!(
//            "LLVM IR optimized at level {}:\n{}",
//            llvm_optimization_level, llvm_ir
//        );
//    }
//
//    // Compile the LLVM IR to a temporary object file.
//    let object_file = try!(convert_io_error(NamedTempFile::new()));
//    let obj_file_path = object_file.path().to_str().expect("path not valid utf-8");
//
//    if do_verbose {
//        println!("Writing object file to {}", obj_file_path);
//    }
//
//    compiler::write_object_file(&mut llvm_module, &obj_file_path).unwrap();
//
//    let output_path = match output_path {
//        Some(op) => op,
//        None => executable_name(path),
//    };
//
//    if do_verbose {
//        println!("Writing executable to {}", output_path);
//    }
//
//    let res = link_object_file(&obj_file_path, &output_path, target_triple);
//    match res {
//        Ok(_) => (),
//        Err(e) => panic!(format!("Linking executable failed: {}", e)),
//    };
//
//    if do_strip_executable {
//        let strip_args = ["-s", &output_path[..]];
//        shell::run_shell_command("strip", &strip_args[..]).unwrap();
//        if do_verbose {
//            println!("Stripped executable of debug symbols.");
//        }
//    }

    Ok(())
}

fn link_object_file(
    object_file_path: &str,
    executable_path: &str,
    target_triple: Option<String>,
) -> Result<(), String> {
    // Link the object file.
    let clang_args = if let Some(ref target_triple) = target_triple {
        vec![
            object_file_path,
            "c_defns/jverbs.c",
            "c_defns/jmemory.c",
            "-target",
            &target_triple,
            "-o",
            &executable_path[..],
            "-lm",
        ]
    } else {
        vec![
            object_file_path,
            "c_defns/jverbs.c",
            "c_defns/jmemory.c",
            "-o",
            &executable_path[..],
            "-lm",
        ]
    };

    shell::run_shell_command("clang-7", &clang_args[..])
}

//#[test]
//fn executable_name_test() {
//    assert_eq!(executable_name("test.ijs"), "test");
//}
//
//#[test]
//fn executable_name_relative_path_test() {
//    assert_eq!(executable_name("dir/test.ijs"), "test");
//}