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extern crate rustc_serialize;

use std::env;
use std::fs;
use std::path::PathBuf;
use err::ProfError;
use std::process::Command;
use std::path::Path;
use self::rustc_serialize::json::Json;

/// Returns the closest ancestor path containing a `target` directory.
///
/// Returns `None` if no ancestor path contains a `target` directory, or if
/// the limit of MAX_ANCESTORS ancestors has been reached.
pub fn find_target() -> Option<PathBuf> {
    /// Checks if the directory contains `Cargo.toml`
    fn contains_manifest(path: &PathBuf) -> bool {
        fs::read_dir(path)
            .map(|entries| {
                entries.filter_map(|res| res.ok())
                       .any(|ent| ent.path().ends_with("target"))
            })
            .unwrap_or(false)
    }

    // From the current directory we work our way up, looking for `Cargo.toml`
    env::current_dir().ok().and_then(|mut wd| {
        for _ in 0..10 {
            if contains_manifest(&mut wd) {
                return Some(wd);
            }
            if !wd.pop() {
                break;
            }
        }

        None
    })
}


// returns the name of the package parsed from Cargo.toml
// this will only work if the package name is directly underneath [package] tag
pub fn get_package_name() -> Result<String, ProfError> {

    let manifest = Command::new("cargo")
                       .arg("read-manifest")
                       .output()
                       .unwrap_or_else(|e| panic!("failed to execute process: {}", e));


    let out = String::from_utf8(manifest.stdout).unwrap_or("".to_string());
    let data = Json::from_str(&out).or(Err(ProfError::ReadManifestError));


    data.and_then(|x| {
        x.as_object()
         .expect("Could not extract object from read manifest JSON. Please submit bug.")
         .get("name")
         .ok_or(ProfError::NoNameError)
         .and_then(|x| Ok(x.to_string().replace("\"", "")))
    })



}

// build the binary by calling cargo build
// return the path to the built binary
pub fn build_binary(release: bool) -> Result<String, ProfError> {
    let package_name = try!(get_package_name());

    match release {
        true => {
            println!("\n\x1b[1;33mCompiling \x1b[1;0m{} in release mode...",
                     package_name);
            let out = Command::new("cargo")
                          .arg("build --release")
                          .output()
                          .unwrap_or_else(|e| panic!("failed to execute process: {}", e));
            let target_dir = find_target()
                                 .ok_or(ProfError::NoTargetDirectory)
                                 .and_then(|x| {
                                     Ok(x.to_str()
                                         .expect("target directory could not be converted to \
                                                  string.")
                                         .to_string())
                                 });
            let path = target_dir.and_then(|x| Ok(x + "/target/release/" + &package_name))
                                 .unwrap_or("".to_string());
            if !Path::new(&path).exists() {
                return Err(ProfError::CompilationError(package_name.to_string(),
                                                       String::from_utf8(out.stderr)
                                                           .unwrap_or("".to_string())));
            }

            return Ok(path);

        }
        false => {
            println!("\n\x1b[1;33mCompiling \x1b[1;0m{} in debug mode...",
                     package_name);
            let out = Command::new("cargo")
                          .arg("build")
                          .output()
                          .unwrap_or_else(|e| panic!("failed to execute process: {}", e));
            let target_dir = find_target()
                                 .ok_or(ProfError::NoTargetDirectory)
                                 .and_then(|x| {
                                     Ok(x.to_str()
                                         .expect("target directory could not be converted to \
                                                  string.")
                                         .to_string())
                                 });
            let path = target_dir.and_then(|x| Ok(x + "/target/debug/" + &package_name))
                                 .unwrap_or("".to_string());
            if !Path::new(&path).exists() {
                return Err(ProfError::CompilationError(package_name.to_string(),
                                                       String::from_utf8(out.stderr)
                                                           .unwrap_or("".to_string())));
            }

            return Ok(path);

        }
    }

#[cfg(test)]
    mod test {
        #[test]
        fn test_find_target() {
            assert_eq!(1, 1);
        }

        #[test]
        fn test_get_package_name() {
            assert_eq!(1, 1);
            assert_eq!(1, 1);
        }

        #[test]
        fn test_build_binary() {
            assert_eq!(1, 1);
        }
    }
}