// 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::*;

// #[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! 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 {
    println!("generating wallet");
    let str = cchar_to_str!(msg);
    let rust_wallet = wallet_impl::Wallet::new(str);
    println!("rust_wallet: {:?}", &rust_wallet);
    convert_to_cwallet(rust_wallet)
}

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

#[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(cw: CWallet) -> *mut c_char{
    let rwallet = convert_to_rwallet(&cw);
    println!("rwallet: {:?}", rwallet);
    let address = rwallet.get_address();
    let address_str = format!("{:?}", address);
    let c_address = CString::new(address_str).unwrap();
    c_address.into_raw()
}

unsafe fn convert_to_cwallet(rwallet: Wallet) -> CWallet {
    // 转换Rust字符串数据为C的字符串并移交ownership
    let msgkey = CString::new(rwallet.msg_key).unwrap();
    let c_msgkey: *mut c_char = msgkey.into_raw();
    let masterkey = CString::new(rwallet.master_key).unwrap();
    let c_masterkey: *mut c_char = masterkey.into_raw();
    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 convert_to_rwallet(cwallet: &CWallet) -> Wallet {
    let pmsg = cchar_to_str!(cwallet.msg_key);
    let pm = cchar_to_str!(cwallet.master_key);
    let ps = cchar_to_str!(cwallet.second_key);
    let pb = cchar_to_str!(cwallet.backup_key);
    Wallet {
        msg_key: pmsg.to_string(),
        master_key: pm.to_string(),
        second_key: Some(ps.to_string()),
        backup_key: Some(pb.to_string())
    }
}