use super::{ffi, gpconf::OpenconnectArgs, vpnc_script::find_default_vpnc_script};
use std::ffi::{c_char, c_void, CString};

#[derive(Debug)]
pub(crate) struct VpnOptions {
    server: CString,
    cookie: CString,
    user_agent: CString,

    script: CString,
    certificate: Option<CString>,
    servercert: Option<CString>,
}

impl VpnOptions {
    pub fn builder() -> VpnOptionsBuilder {
        VpnOptionsBuilder::default()
    }

    pub fn as_oc_options(&self, user_data: *mut c_void) -> ffi::Options {
        ffi::Options {
            server: self.server.as_ptr(),
            cookie: self.cookie.as_ptr(),
            user_agent: self.user_agent.as_ptr(),
            user_data,

            script: self.script.as_ptr(),
            certificate: Self::option_as_ptr(&self.certificate),
            servercert: Self::option_as_ptr(&self.servercert),
        }
    }

    fn option_as_ptr(value: &Option<CString>) -> *const c_char {
        match value {
            Some(value) => value.as_ptr(),
            None => std::ptr::null(),
        }
    }
}

#[derive(Debug, Default)]
pub(crate) struct VpnOptionsBuilder {
    server: String,
    cookie: String,
    user_agent: String,
    openconnect_args: OpenconnectArgs,
}

impl VpnOptionsBuilder {
    pub fn server(&mut self, server: &str) -> &mut Self {
        self.server = server.to_string();
        self
    }

    pub fn cookie(&mut self, cookie: &str) -> &mut Self {
        self.cookie = cookie.to_string();
        self
    }

    pub fn user_agent(&mut self, user_agent: &str) -> &mut Self {
        self.user_agent = user_agent.to_string();
        self
    }

    pub fn with_openconnect_args(&mut self, openconnect_args: OpenconnectArgs) -> &mut Self {
        self.openconnect_args = openconnect_args;
        self
    }

    fn to_cstr(value: &str) -> CString {
        CString::new(value.to_string()).expect("Failed to convert to CString")
    }

    pub fn build(&self) -> VpnOptions {
        let openconnect_args = &self.openconnect_args;
        let script = openconnect_args
            .script()
            .or_else(|| find_default_vpnc_script().map(|s| s.to_string()))
            .map(|s| Self::to_cstr(&s))
            .unwrap_or_default();
        let certificate = openconnect_args.certificate().map(|s| Self::to_cstr(&s));
        let servercert = openconnect_args.servercert().map(|s| Self::to_cstr(&s));

        VpnOptions {
            server: Self::to_cstr(&self.server),
            cookie: Self::to_cstr(&self.cookie),
            user_agent: Self::to_cstr(&self.user_agent),
            script,
            certificate,
            servercert,
        }
    }
}