// lib.rs
//
// 此部分代码主要负责Rust-C两侧的数据内存结构转换，提供了C侧的函数接口。注意命名规范：
// 在C侧使用时，凡是函数名带有 '_cwallet'的，调用过之后都必须用'free_cwallet'释放内存，
// 否则导致内存泄漏
//

use std::ffi::{CStr, CString};
use std::os::raw::c_char;

mod wallet;
use wallet_impl::Wallet;

use crate::wallet::*;
mod utils;
use utils::str_utils::{base64_to_hex, hex_to_base64};

// #[cfg(target_os = "android")]
// mod android;
macro_rules! cchar_to_str{
    ($p1:expr) => {
        {
            let s = CStr::from_ptr($p1);
            let ps = s.to_str().unwrap();
            ps
        }
    }
}

macro_rules! cchar_to_string{
    ($p1:expr) => {
        {
            let s = CStr::from_ptr($p1);
            let ps = s.to_str().unwrap();
            ps.to_string()
        }
    }
}

macro_rules! cchar_to_ostring{
    ($p1:expr) => {
        {
            let s = CStr::from_ptr($p1);
            let pb = s.to_str().unwrap();
            let result = if pb.is_empty() {
                None
            } else {
                Some(pb.to_string())
            };
            result
        }
    }
}

macro_rules! str_to_cchar {
    ($p1:expr) => {
        {
            let msgkey = CString::new($p1).unwrap();
            let c_msgkey: *mut c_char = msgkey.into_raw();
            c_msgkey
        }
    };
}

macro_rules! ostr_to_cchar{
    ($p1:expr) => {
        {
            let key = match $p1 {
                Some(val) => {
                    CString::new(val).unwrap()
                },
                None => CString::new("").unwrap()
            };
            let c_key: *mut c_char = key.into_raw();
            c_key
        }
    }
}

#[repr(C)]
pub struct CWallet {
    pub msg_key: *mut c_char,
    pub master_key: *mut c_char,
    pub second_key: *mut c_char,
    pub backup_key: *mut c_char,
}

#[no_mangle]
pub unsafe extern "C" fn new_wallet(msg: *const c_char) -> CWallet {
    let str = cchar_to_str!(msg);
    let rust_wallet = wallet_impl::Wallet::new(str);
    convert_to_cwallet(rust_wallet)
}


#[no_mangle]
pub unsafe extern "C" fn reset_wallet(
    msg_key: *const c_char,
    master_key: *const c_char,
    second_key: *const c_char,
    backup_key: *const c_char,
) -> CWallet {
    let rust_wallet = generate_rwallet(msg_key, master_key, second_key, backup_key);
    let rust_wallet2 = rust_wallet.reset_wallet();
    convert_to_cwallet(rust_wallet2)
}

#[no_mangle]
pub unsafe extern "C" fn free_cwallet(cw: CWallet) {
    drop(CString::from_raw(cw.msg_key));
    drop(CString::from_raw(cw.master_key));
    drop(CString::from_raw(cw.second_key));
    drop(CString::from_raw(cw.backup_key));
}

#[no_mangle]
pub unsafe extern "C" fn get_address(
    msg_key: *const c_char,
    master_key: *const c_char,
    second_key: *const c_char,
    backup_key: *const c_char,
) -> *mut c_char{
    let rwallet = generate_rwallet(msg_key, master_key, second_key, backup_key);
    let address = rwallet.get_address();
    let address_str = format!("{:?}", address);
    let c_address = CString::new(address_str).unwrap();
    c_address.into_raw()
}

#[no_mangle]
pub unsafe extern "C" fn generate_sec_key(
    msg_key: *const c_char,
    master_key: *const c_char,
    second_key: *const c_char,
    backup_key: *const c_char,
) -> *mut c_char {
    let rwallet = generate_rwallet(msg_key, master_key, second_key, backup_key);
    let s_key = rwallet.generate_sec_key();
    let cs_key = CString::new(s_key).unwrap();
    cs_key.into_raw()
}

#[no_mangle]
pub unsafe extern "C" fn sign(
    msg_key: *const c_char,
    master_key: *const c_char,
    second_key: *const c_char,
    backup_key: *const c_char,
    msg: *const c_char
) -> *mut c_char{
    let rwallet = generate_rwallet(msg_key, master_key, second_key, backup_key);
    let msg_str = cchar_to_str!(msg);
    let signature = rwallet.sign(msg_str);
    let r = match signature {
        Ok(v) => v,
        Err(err) => panic!("Problem sign: {:?}", err),
    };
    str_to_cchar!(r)
}

#[no_mangle]
pub unsafe extern "C" fn sign_for_tran(
    msg_key: *const c_char,
    master_key: *const c_char,
    second_key: *const c_char,
    backup_key: *const c_char, 
    msg: *const c_char
) -> *mut c_char{
    let rwallet = generate_rwallet(msg_key, master_key, second_key, backup_key);
    let msg_str = cchar_to_str!(msg);
    let signature = rwallet.sign_for_tran(msg_str);
    let (r, recid) = match signature {
        Ok((v, _recid)) => (v, _recid),
        Err(err) => panic!("Problem sign: {:?}", err),
    };
    let result = format!("{}|{}", r, recid);
    str_to_cchar!(result)
}

#[no_mangle]
pub unsafe extern "C" fn rencrypt(
    msg_key: *const c_char,
    master_key: *const c_char,
    second_key: *const c_char,
    backup_key: *const c_char, 
    msg: *const c_char
) -> *mut c_char{
    let rwallet = generate_rwallet(msg_key, master_key, second_key, backup_key);
    let msg_str = cchar_to_str!(msg);
    let msg_encrypt = match rwallet.zencrypt(msg_str){
        Ok(v) => v,
        Err(err) => panic!("error encrypt: {:?}", err),
    };
    str_to_cchar!(msg_encrypt)
}

#[no_mangle]
pub unsafe extern "C" fn rdecrypt(
    msg_key: *const c_char,
    master_key: *const c_char,
    second_key: *const c_char,
    backup_key: *const c_char, 
    msg: *const c_char
) -> *mut c_char{
    let rwallet = generate_rwallet(msg_key, master_key, second_key, backup_key);
    let msg_str = cchar_to_str!(msg);
    let msg_decrypt = match rwallet.zdecrypt(msg_str){
        Ok(v) => v,
        Err(err) => panic!("error decrypt: {:?}", err),
    };
    str_to_cchar!(msg_decrypt)
}

#[no_mangle]
pub unsafe extern "C" fn str_deflate(content: *const c_char) -> *mut c_char {
    let content_str = cchar_to_str!(content);
    let msg_base64 = hex_to_base64(&content_str);
    str_to_cchar!(msg_base64)
}

#[no_mangle]
pub unsafe extern "C" fn str_inflate(content: *const c_char) -> *mut c_char {
    let content_str = cchar_to_str!(content);
    let msg_hex = base64_to_hex(&content_str);
    str_to_cchar!(msg_hex)
}

unsafe fn convert_to_cwallet(rwallet: Wallet) -> CWallet {
    let c_msgkey: *mut c_char = str_to_cchar!(rwallet.msg_key);
    let c_masterkey: *mut c_char = str_to_cchar!(rwallet.master_key);
    let c_secondkey = ostr_to_cchar!(rwallet.second_key);
    let c_backupkey = ostr_to_cchar!(rwallet.backup_key);

    let cw = CWallet {
        msg_key: c_msgkey,
        master_key: c_masterkey,
        second_key: c_secondkey,
        backup_key: c_backupkey,
    };
    cw
}

unsafe fn generate_rwallet(
    msg_key: *const c_char,
    master_key: *const c_char,
    second_key: *const c_char,
    backup_key: *const c_char,
) ->Wallet {
    let pmsg = cchar_to_string!(msg_key);
    let pm = cchar_to_string!(master_key);
    let second_key = cchar_to_ostring!(second_key);
    let backup_key = cchar_to_ostring!(backup_key);
    Wallet {
        msg_key: pmsg,
        master_key: pm,
        second_key: second_key,
        backup_key: backup_key
    }
}