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use bitsy_lang::*;
use bitsy_lang::sim::*;
use bitsy_lang::sim::ext::Ext;

mod lsp;

mod repl;
mod testbench;
use repl::*;
use testbench::*;
use clap::Parser;

use std::collections::BTreeMap;

#[derive(Parser, Debug)]
#[command(name = "bitsy", author, version, about, long_about = None)]
struct Args {
    filename: Option<String>,

    #[arg(short, long, default_value_t = false)]
    compile: bool,

    #[arg(long, default_value_t = false)]
    lsp: bool,

    #[arg(long)]
    tb: Option<String>,

    #[arg(long)]
    top: Option<String>,

    #[arg(short, long, default_value_t = false)]
    debug: bool,
}

fn main_compile(args: &Args) {
    let filename = args.filename.as_ref();
    let filename: &String = filename.unwrap_or_else(|| {
        use clap::CommandFactory;
        let mut cmd = Args::command();
        eprintln!("{}", cmd.render_usage());
        std::process::exit(1)
    });

    let text = std::fs::read_to_string(&filename).unwrap().to_string();
    let package = match bitsy_lang::load_package_from_string(&text) {
        Ok(package) => package,
        Err(errors) => {
            for error in &errors {
                eprintln!("{error:?}");
            }
            eprintln!("Circuit has {} errors.", errors.len());
            std::process::exit(1);
        },
    };

    let component_name = package.moddefs().first().map(|component| component.name().to_string()).unwrap();
    let top_name = match &args.top {
        Some(top_name) => top_name,
        None => &component_name,
    };

    let _circuit = match package.top(&top_name) {
        Ok(circuit) => circuit,
        Err(error) => {
            eprintln!("{error:?}");
            eprintln!("Circuit has 1 errors.");
            std::process::exit(1);
        },
    };

    package.emit_mlir();
}

fn main_run(args: &Args) {
    let filename = args.filename.as_ref();
    let filename: &String = filename.unwrap_or_else(|| {
        use clap::CommandFactory;
        let mut cmd = Args::command();
        eprintln!("{}", cmd.render_usage());
        std::process::exit(1)
    });

    let text = std::fs::read_to_string(&filename).unwrap().to_string();

    let package = match bitsy_lang::load_package_from_string(&text) {
        Ok(package) => package,
        Err(errors) => {
            for error in &errors {
                eprintln!("{error:?}");
            }
            eprintln!("Circuit has {} errors.", errors.len());
            std::process::exit(1);
        },
    };

    let testbench_filename = args.tb.clone().or_else(|| testbench_for(&filename));
    let testbench = if args.debug {
        let command = TestbenchCommand::Debug;
        Testbench(None, vec![], vec![command])
    } else if let Some(tb_filename) = testbench_filename {
        println!("Using testbench file: {tb_filename}");
        let text = std::fs::read_to_string(tb_filename.clone()).unwrap();
        let tb: Testbench = parse_testbench(&text).expect(&format!("Error parsing testbench: {tb_filename}"));
        tb
    } else {
        println!("No testbench file");
        let command = TestbenchCommand::Debug;
        Testbench(None, vec![], vec![command])
    };

    let top_name = match args.top.clone().or_else(|| testbench.0.clone()) {
        Some(top_name) => top_name,
        None => package.moddefs().first().map(|component| component.name().to_string()).unwrap(),
    };

    let circuit = match package.top(&top_name) {
        Ok(circuit) => circuit,
        Err(error) => {
            eprintln!("{error:?}");
            eprintln!("Circuit has 1 errors.");
            std::process::exit(1);
        },
    };

    let sim: Sim = make_sim(circuit.clone(), &testbench);
    let mut repl = Repl::new(sim, circuit, testbench);
    repl.run();
}

fn main() {
    let args = Args::parse();
    if args.lsp {
        lsp::run_lsp();
        std::process::exit(0);
    } else if args.compile {
        main_compile(&args);
    } else {
        main_run(&args);
    }
}

fn testbench_for(filename: &str) -> Option<String> {
    let path = std::path::Path::new(filename);
    let parent: &std::path::Path = path.parent().unwrap();
    let file = format!("{}.tb", path.file_stem().unwrap().to_str().unwrap());
    let tb_filename = parent.join(file).into_os_string().into_string().unwrap();
    let exists = std::fs::metadata(&tb_filename).map(|metadata| metadata.is_file()).unwrap_or(false);

    if exists {
        Some(tb_filename)
    } else {
        None
    }
}

fn make_sim(circuit: Circuit, testbench: &Testbench) -> Sim {
    let mut exts: Vec<Box<dyn Ext>> = Vec::new();
    for TestbenchLink(extname, driver, params) in &testbench.1 {
        let mut params_map: BTreeMap<String, String> = params.iter().cloned().collect::<BTreeMap<_, _>>();
        let ext: Box<dyn Ext> = match driver.as_str() {
            "Monitor" => {
                let e = Box::new(bitsy_lang::sim::ext::monitor::Monitor::new(extname.clone()));
                e
            },
            "RiscVDecoder" => {
                let e = Box::new(bitsy_lang::sim::ext::riscv_decoder::RiscvDecoder::new(extname.clone()));
                e
            },
            "Ram" => {
                let mut e = Box::new(bitsy_lang::sim::ext::ram::Ram::new(extname.clone()));
                if let Some(data_filename) = params_map.remove("file") {
                    e.load_from_file(data_filename.clone()).expect(&format!("Couldn't load {data_filename}"));
                }
                e
            },
            "Mem" => {
                let mut e = Box::new(bitsy_lang::sim::ext::mem::Mem::new(extname.clone()));
                if let Some(data_filename) = params_map.remove("file") {
                    e.load_from_file(data_filename.clone()).expect(&format!("Couldn't load {data_filename}"));
                }
                if let Some(cycles) = params_map.remove("delay") {
                    e.set_read_delay(cycles.parse().unwrap());
                }
                e
            },
            "Video" => {
                let mut e = Box::new(bitsy_lang::sim::ext::video::Video::new(extname.clone()));
                if params_map.remove("disabled") == Some("true".to_string()) {
                    e.disable()
                }
                e
            },
            "Terminal" => {
                let e = Box::new(bitsy_lang::sim::ext::terminal::Terminal::new(extname.clone(), Some("terminal.txt")));
                e
            },
            _ => panic!("Unknown ext module being linked: {driver}")
        };
        assert!(params_map.is_empty(), "Unused params for ext module linkage: {extname}: {params_map:?}");
        exts.push(ext);
    }
    Sim::new(&circuit, exts)
}