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// Copyright 2015-2016, The Gtk-rs Project Developers.
// See the COPYRIGHT file at the top-level directory of this distribution.
// Licensed under the MIT license, see the LICENSE file or <http://opensource.org/licenses/MIT>

use ffi;
use translate::*;
use std;
use std::path::{Path, PathBuf};
use error::BoolError;
use Error;
use std::ptr;

/// Same as [`get_prgname()`].
///
/// [`get_prgname()`]: fn.get_prgname.html
pub fn get_program_name() -> Option<String> {
    get_prgname()
}

pub fn get_prgname() -> Option<String> {
    unsafe {
        from_glib_none(ffi::g_get_prgname())
    }
}

/// Same as [`set_prgname()`].
///
/// [`set_prgname()`]: fn.set_prgname.html
pub fn set_program_name(name: Option<&str>) {
    set_prgname(name)
}

pub fn set_prgname(name: Option<&str>) {
    unsafe {
        ffi::g_set_prgname(name.to_glib_none().0)
    }
}

pub fn getenv(variable_name: &str) -> Option<String> {
    #[cfg(windows)]
    use ffi::g_getenv_utf8 as g_getenv;
    #[cfg(not(windows))]
    use ffi::g_getenv;

    unsafe {
        from_glib_none(g_getenv(variable_name.to_glib_none().0))
    }
}

pub fn setenv(variable_name: &str, value: &str, overwrite: bool) -> Result<(), BoolError> {
    #[cfg(windows)]
    use ffi::g_setenv_utf8 as g_setenv;
    #[cfg(not(windows))]
    use ffi::g_setenv;

    unsafe {
        BoolError::from_glib(g_setenv(variable_name.to_glib_none().0,
                                value.to_glib_none().0,
                                overwrite.to_glib()),
                             "Failed to set environment variable")
    }
}

pub fn unsetenv(variable_name: &str) {
    #[cfg(windows)]
    use ffi::g_unsetenv_utf8 as g_unsetenv;
    #[cfg(not(windows))]
    use ffi::g_unsetenv;

    unsafe {
        g_unsetenv(variable_name.to_glib_none().0)
    }
}

pub fn get_user_name() -> Option<String> {
    #[cfg(all(windows,target_arch="x86"))]
    use ffi::g_get_user_name_utf8 as g_get_user_name;
    #[cfg(not(all(windows,target_arch="x86")))]
    use ffi::g_get_user_name;

    unsafe {
        from_glib_none(g_get_user_name())
    }
}

pub fn get_real_name() -> Option<std::path::PathBuf> {
    #[cfg(all(windows,target_arch="x86"))]
    use ffi::g_get_real_name_utf8 as g_get_real_name;
    #[cfg(not(all(windows,target_arch="x86")))]
    use ffi::g_get_real_name;

    unsafe {
        from_glib_none(g_get_real_name())
    }
}

pub fn get_current_dir() -> Option<PathBuf> {
    #[cfg(windows)]
    use ffi::g_get_current_dir_utf8 as g_get_current_dir;
    #[cfg(not(windows))]
    use ffi::g_get_current_dir;

    unsafe {
        from_glib_full(g_get_current_dir())
    }
}

pub fn filename_to_uri<'a, P: AsRef<Path>, Q: Into<Option<&'a str>>>(filename: P, hostname: Q) -> Result<String, Error> {
    #[cfg(windows)]
    use ffi::g_filename_to_uri_utf8 as g_filename_to_uri;
    #[cfg(not(windows))]
    use ffi::g_filename_to_uri;

    let hostname = hostname.into();
    let hostname = hostname.to_glib_none();
    unsafe {
        let mut error = std::ptr::null_mut();
        let ret = g_filename_to_uri(filename.as_ref().to_glib_none().0, hostname.0, &mut error);
        if error.is_null() { Ok(from_glib_full(ret)) } else { Err(from_glib_full(error)) }
    }
}

pub fn filename_from_uri(uri: &str) -> Result<(std::path::PathBuf, Option<String>), Error> {
    #[cfg(windows)]
    use ffi::g_filename_from_uri_utf8 as g_filename_from_uri;
    #[cfg(not(windows))]
    use ffi::g_filename_from_uri;

    unsafe {
        let mut hostname = ptr::null_mut();
        let mut error = ptr::null_mut();
        let ret = g_filename_from_uri(uri.to_glib_none().0, &mut hostname, &mut error);
        if error.is_null() { Ok((from_glib_full(ret), from_glib_full(hostname))) } else { Err(from_glib_full(error)) }
    }
}

pub fn find_program_in_path<P: AsRef<Path>>(program: P) -> Option<PathBuf> {
    #[cfg(all(windows,target_arch="x86"))]
    use ffi::g_find_program_in_path_utf8 as g_find_program_in_path;
    #[cfg(not(all(windows,target_arch="x86")))]
    use ffi::g_find_program_in_path;

    unsafe {
        from_glib_full(g_find_program_in_path(program.as_ref().to_glib_none().0))
    }
}

pub fn get_home_dir() -> Option<std::path::PathBuf> {
    #[cfg(all(windows,target_arch="x86"))]
    use ffi::g_get_home_dir_utf8 as g_get_home_dir;
    #[cfg(not(all(windows,target_arch="x86")))]
    use ffi::g_get_home_dir;

    unsafe {
        from_glib_none(g_get_home_dir())
    }
}

pub fn get_tmp_dir() -> Option<std::path::PathBuf> {
    #[cfg(all(windows,target_arch="x86"))]
    use ffi::g_get_tmp_dir_utf8 as g_get_tmp_dir;
    #[cfg(not(all(windows,target_arch="x86")))]
    use ffi::g_get_tmp_dir;

    unsafe {
        from_glib_none(g_get_tmp_dir())
    }
}

pub fn mkstemp<P: AsRef<std::path::Path>>(tmpl: P) -> i32 {
    #[cfg(windows)]
    use ffi::g_mkstemp_utf8 as g_mkstemp;
    #[cfg(not(windows))]
    use ffi::g_mkstemp;

    unsafe {
        g_mkstemp(tmpl.as_ref().to_glib_none().0)
    }
}