// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

use extra::sha1::Sha1;
use extra::digest::Digest;
use extra::workcache;
use std::io;

/// Hashes the file contents along with the last-modified time
pub fn digest_file_with_date(path: &Path) -> ~str {
    use conditions::bad_path::cond;
    use cond1 = conditions::bad_stat::cond;

    let mut sha = ~Sha1::new();
    let s = io::read_whole_file_str(path);
    match s {
        Ok(s) => {
            (*sha).input_str(s);
            let st = match path.stat() {
                Some(st) => st,
                None => cond1.raise((path.clone(), fmt!("Couldn't get file access time")))
            };
            (*sha).input_str(st.st_mtime.to_str());
            (*sha).result_str()
        }
        Err(e) => cond.raise((path.clone(), fmt!("Couldn't read file: %s", e))).to_str()
    }
}

/// Hashes only the last-modified time
pub fn digest_only_date(path: &Path) -> ~str {
    use cond = conditions::bad_stat::cond;

    let mut sha = ~Sha1::new();
    let st = match path.stat() {
                Some(st) => st,
                None => cond.raise((path.clone(), fmt!("Couldn't get file access time")))
    };
    (*sha).input_str(st.st_mtime.to_str());
    (*sha).result_str()
}

/// Adds multiple discovered outputs
pub fn discover_outputs(e: &mut workcache::Exec, outputs: ~[Path]) {
    debug!("Discovering %? outputs", outputs.len());
    for p in outputs.iter() {
        debug!("Discovering output! %s", p.to_str());
        // For now, assume that all discovered outputs are binaries
        e.discover_output("binary", p.to_str(), digest_only_date(p));
    }
}