#![allow(non_upper_case_globals)]
#![allow(non_camel_case_types)]
#![allow(non_snake_case)]

include!(concat!(env!("OUT_DIR"), "/bindings.rs"));

use std::convert::TryInto;
use std::ffi::CString;
use std::os::raw::c_char;

pub struct Dpkg {
    program_name: *mut c_char,
    root_directory: Option<*mut c_char>,
}

impl Dpkg {
    pub fn new(program_name: &str, root_directory: Option<&str>) -> Dpkg {
        let dpkg = Dpkg {
            program_name: CString::new(program_name).unwrap().into_raw(),
            root_directory: match root_directory {
                Some(dir) => Some(CString::new(dir).unwrap().into_raw()),
                None => None,
            },
        };

        unsafe {
            dpkg_set_progname(dpkg.program_name);
            push_error_context();

            if let Some(dir) = dpkg.root_directory {
                dpkg_db_set_dir(dir);
            }
            modstatdb_init();
            modstatdb_open(modstatdb_rw_msdbrw_available_readonly);
        }

        dpkg
    }
}

impl Drop for Dpkg {
    fn drop(&mut self) {
        unsafe {
            pkg_db_reset();
            modstatdb_done();
            modstatdb_shutdown();

            pop_error_context(ehflag_normaltidy.try_into().unwrap());

            let _ = CString::from_raw(self.program_name);
            if let Some(dir) = self.root_directory {
                let _ = CString::from_raw(dir);
            }

        }
    }
}