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extern crate cargo;

use std::path::{Path, PathBuf};
use std::process::{self, Command};
use std::ffi::{OsString};
use cargo::core::{Workspace};
use cargo::ops::{CompileOptions};
use cargo::util::{CargoTestError, Test};
use cargo::util::process;
use cargo::{CargoResult};

pub struct CoverageOptions<'a> {
    pub compile_opts: CompileOptions<'a>,
    pub merge_dir: &'a Path,
    pub kcov_path: &'a Path,
    pub merge_args: Vec<OsString>, // TODO: Or &[str] ?
    pub exclude_pattern: Option<String>
}

pub fn run_coverage(ws: &Workspace, options: &CoverageOptions, test_args: &[String]) -> CargoResult<Option<CargoTestError>> {
    let mut compilation = try!(cargo::ops::compile(ws, &options.compile_opts));
    compilation.tests.sort_by(|a, b| {
        (a.0.package_id(), &a.1).cmp(&(b.0.package_id(), &b.1))
    });

    let config = options.compile_opts.config;
    let cwd = options.compile_opts.config.cwd();

    let mut errors = vec![];

    let v : Vec<std::ffi::OsString> = test_args.iter().cloned().map::<std::ffi::OsString, _>(|val| val.into()).collect();

    //let x = &compilation.tests.map(run_single_coverage);

    for &(ref pkg, _, _, ref exe) in &compilation.tests {
        let to_display = match cargo::util::without_prefix(exe, &cwd) {
            Some(path) => path,
            None => &**exe
        };

        // DLYB trick on OSX is here v
        let mut cmd = try!(compilation.target_process(options.kcov_path, pkg));
        // TODO: Make all that more configurable
        //TODO: The unwraps shouldn't cause problems... right ?
        let target = ws.target_dir().join("kcov-".to_string() + to_display.file_name().unwrap().to_str().unwrap()).into_path_unlocked();
        let default_include_path = format!("--include-path={}", ws.root().display());

        let mut args = vec![
            OsString::from("--verify"),
            OsString::from(default_include_path), 
            OsString::from(target)];

        // add exclude path
        if let Some(ref exclude) = options.exclude_pattern {
            let exclude_option = OsString::from(format!("--exclude-pattern={}", exclude));
            args.push(exclude_option);
        }

        args.push(OsString::from(exe));

        args.extend(v.clone());
        cmd.args(&args);
        try!(config.shell().concise(|shell| {
            shell.status("Running", to_display.display().to_string())
        }));
        try!(config.shell().verbose(|shell| {
            shell.status("Running", cmd.to_string())
        }));

        if let Err(e) = cmd.exec() {
            errors.push(e);
        }
    }

    // Let the user pass mergeargs
    let mut mergeargs : Vec<OsString> = vec!["--merge".to_string().into(), options.merge_dir.as_os_str().to_os_string()];
    mergeargs.extend(options.merge_args.iter().cloned());
    mergeargs.extend(compilation.tests.iter().map(|&(_, _, _, ref exe)|
        ws.target_dir().join("kcov-".to_string() + exe.file_name().unwrap().to_str().unwrap()).into_path_unlocked().into()
    ));
    let mut cmd = process(options.kcov_path.as_os_str().to_os_string());
    cmd.args(&mergeargs);
    try!(config.shell().concise(|shell| {
        shell.status("Merging coverage", options.merge_dir.display().to_string())
    }));
    try!(config.shell().verbose(|shell| {
        shell.status("Merging coverage", cmd.to_string())
    }));
    try!(cmd.exec());
    if errors.is_empty() {
        Ok(None)
    } else {
        Ok(Some(CargoTestError::new(Test::Multiple, errors)))
    }
}

pub fn build_kcov() -> PathBuf {
    if let Some(paths) = std::env::var_os("PATH") {
        for path in std::env::split_paths(&paths) {
            if path.join("kcov").exists() {
                return path.join("kcov");
            }
        }
    }
    if Path::new("kcov/build/src/kcov").exists() {
        return std::env::current_dir().unwrap().join("kcov/build/src/kcov");
    }

    let mut init = String::new();

    init.push_str(r"
    rm -rf master.zip kcov-master kcov
    wget https://github.com/SimonKagstrom/kcov/archive/master.zip
    unzip master.zip
    mv kcov-master kcov
    mkdir -p kcov/build
    ");

    for line in init.split("\n") {
        let line = line.trim();
        if !line.is_empty() {
            println!("Running: {:?}", line);
            let tokens: Vec<_> = line.split(" ").collect();
            let status = Command::new(tokens[0]).args(&tokens[1..]).status().unwrap();
            if !status.success() {
                process::exit(status.code().unwrap());
            }
        }
    }

    let build = r"
        cmake ..
        make
    ";
    for line in build.split("\n") {
        let line = line.trim();
        if !line.is_empty() {
            println!("Running: {:?}", line);
            let tokens: Vec<_> = line.split(" ").collect();
            let status = Command::new(tokens[0]).args(&tokens[1..]).current_dir("kcov/build").status().unwrap();
            if !status.success() {
                process::exit(status.code().unwrap());
            }
        }
    }

    std::env::current_dir().unwrap().join("kcov/build/src/kcov")
}