extern crate clap;
#[macro_use]
extern crate failure;
extern crate tools;
extern crate walkdir;

use clap::{App, Arg, SubCommand};
use std::{
    collections::HashMap,
    fs,
    path::{Path, PathBuf},
    process::Command,
};
use tools::{Test, collect_tests, render_template, update, Result};

const GRAMMAR_DIR: &str = "./crates/ra_syntax/src/grammar";
const INLINE_TESTS_DIR: &str = "./crates/ra_syntax/tests/data/parser/inline";
const GRAMMAR: &str = "./crates/ra_syntax/src/grammar.ron";
const SYNTAX_KINDS: &str = "./crates/ra_syntax/src/syntax_kinds/generated.rs";
const SYNTAX_KINDS_TEMPLATE: &str = "./crates/ra_syntax/src/syntax_kinds/generated.rs.tera";
const AST: &str = "./crates/ra_syntax/src/ast/generated.rs";
const AST_TEMPLATE: &str = "./crates/ra_syntax/src/ast/generated.rs.tera";

fn main() -> Result<()> {
    let matches = App::new("tasks")
        .setting(clap::AppSettings::SubcommandRequiredElseHelp)
        .arg(
            Arg::with_name("verify")
                .long("--verify")
                .help("Verify that generated code is up-to-date")
                .global(true),
        )
        .subcommand(SubCommand::with_name("gen-kinds"))
        .subcommand(SubCommand::with_name("gen-tests"))
        .subcommand(SubCommand::with_name("install-code"))
        .get_matches();
    match matches.subcommand() {
        ("install-code", _) => install_code_extension()?,
        (name, Some(matches)) => run_gen_command(name, matches.is_present("verify"))?,
        _ => unreachable!(),
    }
    Ok(())
}

fn run_gen_command(name: &str, verify: bool) -> Result<()> {
    match name {
        "gen-kinds" => {
            update(Path::new(SYNTAX_KINDS), &render_template(SYNTAX_KINDS_TEMPLATE, GRAMMAR)?, verify)?;
            update(Path::new(AST), &render_template(AST_TEMPLATE, GRAMMAR)?, verify)?;
        },
        "gen-tests" => {
            gen_tests(verify)?
        },
        _ => unreachable!(),
    }
    Ok(())
}


fn gen_tests(verify: bool) -> Result<()> {
    let tests = tests_from_dir(Path::new(GRAMMAR_DIR))?;

    let inline_tests_dir = Path::new(INLINE_TESTS_DIR);
    if !inline_tests_dir.is_dir() {
        fs::create_dir_all(inline_tests_dir)?;
    }
    let existing = existing_tests(inline_tests_dir)?;

    for t in existing.keys().filter(|&t| !tests.contains_key(t)) {
        panic!("Test is deleted: {}", t);
    }

    let mut new_idx = existing.len() + 2;
    for (name, test) in tests {
        let path = match existing.get(&name) {
            Some((path, _test)) => path.clone(),
            None => {
                let file_name = format!("{:04}_{}.rs", new_idx, name);
                new_idx += 1;
                inline_tests_dir.join(file_name)
            }
        };
        update(&path, &test.text, verify)?;
    }
    Ok(())
}

fn tests_from_dir(dir: &Path) -> Result<HashMap<String, Test>> {
    let mut res = HashMap::new();
    for entry in ::walkdir::WalkDir::new(dir) {
        let entry = entry.unwrap();
        if !entry.file_type().is_file() {
            continue;
        }
        if entry.path().extension().unwrap_or_default() != "rs" {
            continue;
        }
        let text = fs::read_to_string(entry.path())?;

        for (_, test) in collect_tests(&text) {
            if let Some(old_test) = res.insert(test.name.clone(), test) {
                bail!("Duplicate test: {}", old_test.name)
            }
        }
    }
    Ok(res)
}

fn existing_tests(dir: &Path) -> Result<HashMap<String, (PathBuf, Test)>> {
    let mut res = HashMap::new();
    for file in fs::read_dir(dir)? {
        let file = file?;
        let path = file.path();
        if path.extension().unwrap_or_default() != "rs" {
            continue;
        }
        let name = {
            let file_name = path.file_name().unwrap().to_str().unwrap();
            file_name[5..file_name.len() - 3].to_string()
        };
        let text = fs::read_to_string(&path)?;
        let test = Test {
            name: name.clone(),
            text,
        };
        match res.insert(name, (path, test)) {
            Some(old) => println!("Duplicate test: {:?}", old),
            None => (),
        }
    }
    Ok(res)
}

fn install_code_extension() -> Result<()> {
    run("cargo install --path crates/ra_lsp_server --force", ".")?;
    if cfg!(windows) {
        run(r"cmd.exe /c npm.cmd install", "./editors/code")?;
    } else {
        run(r"npm install", "./editors/code")?;
    }
    run(r"node ./node_modules/vsce/out/vsce package", "./editors/code")?;
    if cfg!(windows) {
        run(r"cmd.exe /c code.cmd --install-extension ./ra-lsp-0.0.1.vsix", "./editors/code")?;
    } else {
        run(r"code --install-extension ./ra-lsp-0.0.1.vsix", "./editors/code")?;
    }
    Ok(())
}

fn run(cmdline: &'static str, dir: &str) -> Result<()> {
    eprintln!("\nwill run: {}", cmdline);
    let manifest_dir = env!("CARGO_MANIFEST_DIR");
    let project_dir = Path::new(manifest_dir).ancestors().nth(2).unwrap().join(dir);
    let mut args = cmdline.split_whitespace();
    let exec = args.next().unwrap();
    let status = Command::new(exec)
        .args(args)
        .current_dir(project_dir)
        .status()?;
    if !status.success() {
        bail!("`{}` exited with {}", cmdline, status);
    }
    Ok(())
}