#![allow(dead_code)]

extern crate walkdir;

use std::env;
use std::path::Path;
use std::process::Command;
use std::u32;

use self::walkdir::DirEntry;

macro_rules! errorf {
    ($($tt:tt)*) => {
        {
            use ::std::io::Write;
            write!(::std::io::stderr(), $($tt)*).unwrap();
        }
    };
}

pub mod parse;
pub mod respan;

pub fn check_min_stack() {
    let min_stack_value = env::var("RUST_MIN_STACK")
        .expect("RUST_MIN_STACK env var should be set since some tests require it.");
    let min_stack_value: usize = min_stack_value.parse()
        .expect("RUST_MIN_STACK env var should be set since some tests require it.");
    assert!(min_stack_value >= 16000000);
}

/// Read the `ABORT_AFTER_FAILURE` environment variable, and parse it.
pub fn abort_after() -> u32 {
    if let Ok(s) = env::var("ABORT_AFTER_FAILURE") {
        if let Ok(n) = s.parse::<u32>() {
            return n;
        }
    }
    u32::MAX
}

pub fn base_dir_filter(entry: &DirEntry) -> bool {
    let path = entry.path();
    if path.is_dir() {
        return true; // otherwise walkdir does not visit the files
    }
    if path.extension().map(|e| e != "rs").unwrap_or(true) {
        return false;
    }
    let path_string = path.to_string_lossy();
    let path_string = if cfg!(windows) {
        path_string.replace('\\', "/").into()
    } else {
        path_string
    };
    // TODO assert that parsing fails on the parse-fail cases
    if path_string.starts_with("tests/rust/src/test/parse-fail") ||
       path_string.starts_with("tests/rust/src/test/compile-fail") {
        return false;
    }

    if path_string.starts_with("tests/rust/src/test/ui") {
        let stderr_path = path.with_extension("stderr");
        if stderr_path.exists() {
            // Expected to fail in some way
            return false;
        }
    }

    // TODO: support `macro` definitions
    if path_string.starts_with("tests/rust/src/test/run-pass/hygiene") {
        return false;
    }

    match path_string.as_ref() {
        // TODO better support for attributes
        //
        //      let a = A { #[a] b: c };
        "tests/rust/src/librustc_data_structures/blake2b.rs" |
        // TODO better support for attributes
        //
        //      enum A { B = #[a] 2 }
        "tests/rust/src/test/incremental/hashes/enum_defs.rs" |
        // TODO better support for attributes
        //
        //      { #![foo] }
        "tests/rust/src/test/pretty/stmt_expr_attributes.rs" |
        // TODO better support for attributes
        "tests/rust/src/test/run-pass/cfg_stmt_expr.rs" |
        // TODO weird glob import
        //
        //      use ::*;
        "tests/rust/src/test/run-pass/import-glob-crate.rs" |
        // TODO better support for attributes
        //
        //      impl Foo { #![a] }
        "tests/rust/src/test/run-pass/inner-attrs-on-impl.rs" |
        // TODO better support for attributes
        "tests/rust/src/test/run-pass/item-attributes.rs" |
        // TODO support lifetimes before traits
        //
        //      Box<'foo + Bar>
        "tests/rust/src/test/run-pass/trait-object-lifetime-first.rs" |
        // not actually a test case
        "tests/rust/src/test/run-pass/auxiliary/macro-include-items-expr.rs" => false,
        _ => true,
    }
}

pub fn clone_rust() {
    if Path::new("tests/rust").is_dir() {
        return
    }

    println!("cloning rust-lang/rust");
    let result = Command::new("git")
                    .arg("clone")
                    .arg("https://github.com/rust-lang/rust")
                    .arg("tests/rust")
                    .status()
                    .unwrap();
    println!("result: {}", result);
    assert!(result.success());

    println!("reset to known-good rev");
    let result = Command::new("git")
                    .arg("reset")
                    .arg("--hard")
                    .arg("eb8f2586ebd842dec49d3d7f50e49a985ab31493")
                    .current_dir("tests/rust")
                    .status()
                    .unwrap();
    println!("result: {}", result);
    assert!(result.success());
}