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use std::{
    ffi::{CStr, CString},
    mem::forget,
    os::raw::c_char,
    path::Path,
    ptr,
};

#[repr(C)]
#[derive(PartialEq, Clone, Debug)]
pub struct TextRange {
    pub s: usize,
    pub e: usize,
}

#[repr(C)]
#[derive(PartialEq, Clone, Debug)]
pub struct Wordcut {}

fn wordcut_new_with_dict_path(path: &Path) -> *mut Wordcut {
    match wordcut_engine::load_dict(path) {
        Ok(dict) => {
            let wordcut = wordcut_engine::Wordcut::new(dict);
            let boxed_wordcut = Box::new(wordcut);
            Box::into_raw(boxed_wordcut) as *mut Wordcut
        }
        Err(e) => {
            eprintln!("{}", e);
            return ptr::null::<Wordcut>() as *mut Wordcut;
        }
    }
}

#[no_mangle]
pub extern "C" fn wordcut_new_with_dict(path: *const c_char) -> *mut Wordcut {
    let path = unsafe { CStr::from_ptr(path) }.to_str().unwrap();
    let path = Path::new(path);
    wordcut_new_with_dict_path(path)
}

#[no_mangle]
pub extern "C" fn wordcut_new_with_dict_from_default_dir(path: *const c_char) -> *mut Wordcut {
    let path = unsafe { CStr::from_ptr(path) }.to_str().unwrap();
    let path = chamkho::cargo_dir().join(path);
    wordcut_new_with_dict_path(&path)
}

#[no_mangle]
pub extern "C" fn delete_wordcut(wordcut: *mut Wordcut) {
    unsafe {
        Box::from_raw(wordcut as *mut wordcut_engine::Wordcut);
    }
}

#[no_mangle]
pub extern "C" fn delete_text_ranges(text_ranges: *mut TextRange, range_count: usize) {
    unsafe { Vec::from_raw_parts(text_ranges, range_count, range_count) };
}

#[no_mangle]
pub extern "C" fn wordcut_into_text_ranges(
    wordcut: *const Wordcut,
    text: *const c_char,
    range_count: *mut usize,
) -> *mut TextRange {
    let wordcut: *const wordcut_engine::Wordcut = wordcut as *const wordcut_engine::Wordcut;
    let text = unsafe { CStr::from_ptr(text) }.to_str().unwrap();
    let text_ranges = unsafe { (*wordcut).segment(text) };
    let mut text_ranges: Vec<TextRange> = text_ranges
        .into_iter()
        .map(|r| TextRange { s: r.s, e: r.e })
        .collect();
    unsafe {
        *range_count = text_ranges.len();
    };
    let p = text_ranges.as_mut_ptr();
    forget(text_ranges);
    return p;
}

#[no_mangle]
pub extern "C" fn wordcut_into_strings(
    wordcut: *const Wordcut,
    text: *const c_char,
    string_count: *mut usize,
) -> *mut *mut c_char {
    let wordcut: *const wordcut_engine::Wordcut = wordcut as *const wordcut_engine::Wordcut;
    let text = unsafe { CStr::from_ptr(text) }.to_str().unwrap();
    let strings = unsafe { (*wordcut).segment_into_strings(text) };
    let mut strings: Vec<*mut c_char> = strings
        .into_iter()
        .map(|s| CString::new(s).unwrap().into_raw())
        .collect();
    unsafe {
        *string_count = strings.len();
    };
    let p = strings.as_mut_ptr();
    forget(strings);
    return p;
}

#[no_mangle]
pub extern "C" fn delete_strings(strings: *mut *mut c_char, string_count: usize) {
    unsafe {
        let raw_strings = Vec::from_raw_parts(strings, string_count, string_count);
        raw_strings.into_iter().for_each(drop);
    };
}

#[no_mangle]
pub extern "C" fn wordcut_put_delimiters(
    wordcut: *const Wordcut,
    text: *const c_char,
    delim: *const c_char,
) -> *mut c_char {
    let wordcut: *const wordcut_engine::Wordcut = wordcut as *const wordcut_engine::Wordcut;
    let text = unsafe { CStr::from_ptr(text) }.to_str().unwrap();
    let delim = unsafe { CStr::from_ptr(delim) }.to_str().unwrap();
    let segmented_text = unsafe { (*wordcut).put_delimiters(text, delim) };
    let p = CString::new(segmented_text).unwrap().into_raw();
    return p;
}

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

    #[test]
    fn test_wordcut_into_text_ranges() {
        let text = CString::new("ลากา").unwrap().into_raw();
        let wordcut = wordcut_new_with_dict_from_default_dir(
            CString::new("data/thai.txt").unwrap().into_raw(),
        );
        let mut range_count = 0;
        let text_ranges = wordcut_into_text_ranges(wordcut, text, &mut range_count);
        assert_eq!(range_count, 2);
        unsafe {
            assert_eq!(*text_ranges, TextRange { s: 0, e: 2 });
            assert_eq!(*text_ranges.offset(1), TextRange { s: 2, e: 4 });
        }
        delete_text_ranges(text_ranges, range_count);
        delete_wordcut(wordcut);
    }

    #[test]
    fn test_wordcut_into_strings() {
        let text = CString::new("ลากา").unwrap().into_raw();
        let wordcut = wordcut_new_with_dict_from_default_dir(
            CString::new("data/thai.txt").unwrap().into_raw(),
        );
        let mut string_count = 0;
        let segmented_strings = wordcut_into_strings(wordcut, text, &mut string_count);
        assert_eq!(string_count, 2);
        unsafe {
            let s0 = CStr::from_ptr(*segmented_strings).to_str().unwrap();
            let s1 = CStr::from_ptr(*segmented_strings.offset(1))
                .to_str()
                .unwrap();
            assert_eq!(s0, "ลา");
            assert_eq!(s1, "กา");
        }
        delete_strings(segmented_strings, string_count);
        delete_wordcut(wordcut);
    }

    #[test]
    fn test_wordcut_put_delimiters() {
        let text = CString::new("ลากา").unwrap().into_raw();
        let delim = CString::new("---").unwrap().into_raw();
        let wordcut = wordcut_new_with_dict_from_default_dir(
            CString::new("data/thai.txt").unwrap().into_raw(),
        );
        let segmented_text = wordcut_put_delimiters(wordcut, text, delim);
        unsafe {
            let s = CStr::from_ptr(segmented_text).to_str().unwrap();
            assert_eq!(s, "ลา---กา");
        }
        delete_wordcut(wordcut);
    }
}