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//! # gettext C library FFI binding for Rust
//!
//! Usage:
//!
//! ```
//! use gettextrs::*; 
//!
//! setlocale(LocaleCategory::LcAll, "en_US.UTF-8");
//!
//! bindtextdomain("hellorust", "/usr/local/share/locale");
//! textdomain("hellorust");
//!
//! println!("Translated: {}", gettext("Hello, world!"));
//! println!("Singular: {}", ngettext("One thing", "Multiple things", 1));
//! println!("Plural: {}", ngettext("One thing", "Multiple things", 2));
//! ```

/// Raw FFI interface for gettext library
mod gettext_raw {
    use std::os::raw::{c_char, c_int, c_uint};

    extern "C" {
        pub fn gettext(s: *const c_char) -> *const c_char;
        pub fn dgettext(domain: *const c_char, s: *const c_char) -> *const c_char;
        pub fn dcgettext(domain: *const c_char, s: *const c_char, category: c_int) -> *const c_char;

        pub fn ngettext(s1: *const c_char, s2: *const c_char, n: c_uint) -> *const c_char;
        pub fn dngettext(domain: *const c_char, s1: *const c_char, s2: *const c_char, n: c_uint) -> *const c_char;
        pub fn dcngettext(domain: *const c_char, s1: *const c_char, s2: *const c_char, n: c_uint, category: c_int) -> *const c_char;

        pub fn bindtextdomain(domain: *const c_char, dir: *const c_char) -> *const c_char;
        pub fn textdomain(domain: *const c_char) -> *const c_char;

        pub fn bind_textdomain_codeset(domain: *const c_char, codeset: *const c_char) -> *const c_char;

        pub fn setlocale(category: c_int, locale: *const c_char) -> *const c_char;
    }
}

/// Safe wrapper for gettext library
mod gettext {
    use gettext_raw;
    use std::ffi::CString;
    use std::ffi::CStr;

    /// Locale category enum ported from locale.h
    pub enum LocaleCategory {
        /// Character classification and case conversion.
        LcCType = 0,
        /// Non-monetary numeric formats.
        LcNumeric = 1,
        /// Date and time formats.
        LcTime = 2,
        /// Collation order.
        LcCollate = 3,
        /// Monetary formats.
        LcMonetary = 4,
        /// Formats of informative and diagnostic messages and interactive responses.
        LcMessages = 5,
        /// For all.
        LcAll = 6,
        /// Paper size.
        LcPaper = 7,
        /// Name formats.
        LcName = 8,
        /// Address formats and location information.
        LcAddress = 9,
        /// Telephone number formats.
        LcTelephone = 10,
        /// Measurement units (Metric or Other).
        LcMeasurement = 11,
        /// Metadata about the locale information.
        LcIdentification = 12,
    }

    /// Translate msgid to localized message from default domain
    pub fn gettext<T: Into<Vec<u8>>>(s: T) -> String {
        unsafe {
            CStr::from_ptr(gettext_raw::gettext(CString::new(s).unwrap().as_ptr()))
                .to_string_lossy()
                .into_owned()
        }
    }

    /// Translate msgid to localized message from specified domain
    pub fn dgettext<T: Into<Vec<u8>>>(domain: T, s: T) -> String {
        unsafe {
            CStr::from_ptr(gettext_raw::dgettext(CString::new(domain).unwrap().as_ptr(), CString::new(s).unwrap().as_ptr()))
                .to_string_lossy()
                .into_owned()
        }
    }

    /// Translate msgid to localized message from specified domain using custom locale category
    pub fn dcgettext<T: Into<Vec<u8>>>(domain: T, s: T, category: LocaleCategory) -> String {
        unsafe {
            CStr::from_ptr(gettext_raw::dcgettext(CString::new(domain).unwrap().as_ptr(), CString::new(s).unwrap().as_ptr(), category as i32))
                .to_string_lossy()
                .into_owned()
        }
    }

    /// Translate msgid to localized message from default domain (with plural support)
    pub fn ngettext<T: Into<Vec<u8>>>(singular: T, plural : T, n : u32) -> String {
        unsafe {
            CStr::from_ptr(gettext_raw::ngettext(CString::new(singular).unwrap().as_ptr(), CString::new(plural).unwrap().as_ptr(), n))
                .to_string_lossy()
                .into_owned()
        }
    }

    /// Translate msgid to localized message from specified domain (with plural support)
    pub fn dngettext<T: Into<Vec<u8>>>(domain: T, singular: T, plural: T, n : u32) -> String {
        unsafe {
            CStr::from_ptr(gettext_raw::dngettext(CString::new(domain).unwrap().as_ptr(), CString::new(singular).unwrap().as_ptr(), CString::new(plural).unwrap().as_ptr(), n))
                .to_string_lossy()
                .into_owned()
        }
    }

    /// Translate msgid to localized message from specified domain using custom locale category (with plural support)
    pub fn dcngettext<T: Into<Vec<u8>>>(domain: T, singular: T, plural: T, n : u32, category: LocaleCategory) -> String {
        unsafe {
            CStr::from_ptr(gettext_raw::dcngettext(CString::new(domain).unwrap().as_ptr(), CString::new(singular).unwrap().as_ptr(), CString::new(plural).unwrap().as_ptr(), n, category as i32))
                .to_string_lossy()
                .into_owned()
        }
    }

    /// Switch to specific text domain
    pub fn textdomain<T: Into<Vec<u8>>>(domain: T) -> String {
        unsafe {
            CStr::from_ptr(gettext_raw::textdomain(CString::new(domain).unwrap().as_ptr()))
                .to_string_lossy()
                .into_owned()
        }
    }

    /// Bind text domain to some directory containing gettext MO files
    pub fn bindtextdomain<T: Into<Vec<u8>>>(domain: T, dir: T) -> String {
        unsafe {
            CStr::from_ptr(gettext_raw::bindtextdomain(CString::new(domain).unwrap().as_ptr(),
                                                       CString::new(dir).unwrap().as_ptr()))
                .to_string_lossy()
                .into_owned()
        }
    }

    /// Set current locale for translations
    pub fn setlocale<T: Into<Vec<u8>>>(category: LocaleCategory, locale: T) -> String {
        unsafe {
            CStr::from_ptr(gettext_raw::setlocale(category as i32,
                                                  CString::new(locale).unwrap().as_ptr()))
                .to_string_lossy()
                .into_owned()
        }
    }

    pub fn bind_textdomain_codeset<T: Into<Vec<u8>>>(domain: T, codeset: T) -> String {
        unsafe {
            CStr::from_ptr(gettext_raw::bind_textdomain_codeset(CString::new(domain).unwrap().as_ptr(),
                                                       CString::new(codeset).unwrap().as_ptr()))
                .to_string_lossy()
                .into_owned()
        }
    }
}

pub use gettext::*;

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn smoke_test() {
        setlocale(LocaleCategory::LcAll, "en_US.UTF-8");

        bindtextdomain("hellorust", "/usr/local/share/locale");
        textdomain("hellorust");

        assert_eq!("Hello, world!", gettext("Hello, world!"));
    }

    #[test]
    fn plural_test() {
        setlocale(LocaleCategory::LcAll, "en_US.UTF-8");

        bindtextdomain("hellorust", "/usr/local/share/locale");
        textdomain("hellorust");

        assert_eq!("Hello, world!", ngettext("Hello, world!", "Hello, worlds!", 1));
        assert_eq!("Hello, worlds!", ngettext("Hello, world!", "Hello, worlds!", 2));
    }
}