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pub mod abi;
pub mod backend;
pub mod body;
pub mod request;
pub mod response;

pub use crate::body::Body;
pub use crate::request::{downstream_request, RequestExt};
pub use crate::response::ResponseExt;
pub use http::{self, Request, Response};

pub(crate) const HEADER_NAME_MAX_LEN: usize = 4096;
pub(crate) const HEADER_VALUE_MAX_LEN: usize = 4096;
pub(crate) const METHOD_MAX_LEN: usize = 1024;
pub(crate) const URI_MAX_LEN: usize = 4096;

#[derive(Debug, PartialEq, Eq, Clone)]
pub struct Error {
    pub msg: String,
}
impl Error {
    pub(crate) fn new<S: AsRef<str>>(msg: S) -> Error {
        Error {
            msg: msg.as_ref().to_string(),
        }
    }
}

impl From<http::Error> for Error {
    fn from(e: http::Error) -> Self {
        Error {
            msg: format!("http error: {}", e),
        }
    }
}

pub fn uap_parse(user_agent: &str) -> Result<(String, Option<String>, Option<String>, Option<String>), Error> {
    let user_agent: &[u8] = user_agent.as_ref();
    let max_length = 255;
    let mut family = Vec::with_capacity(max_length);
    let mut major = Vec::with_capacity(max_length);
    let mut minor = Vec::with_capacity(max_length);
    let mut patch = Vec::with_capacity(max_length);
    let mut family_nwritten = 0;
    let mut major_nwritten = 0;
    let mut minor_nwritten = 0;
    let mut patch_nwritten = 0;

    let status = unsafe { abi::xqd_uap_parse(
        user_agent.as_ptr(),
        user_agent.len(),
        family.as_mut_ptr(),
        family.capacity(),
        &mut family_nwritten,
        major.as_mut_ptr(),
        major.capacity(),
        &mut major_nwritten,
        minor.as_mut_ptr(),
        minor.capacity(),
        &mut minor_nwritten,
        patch.as_mut_ptr(),
        patch.capacity(),
        &mut patch_nwritten)
    };
    if status.is_err() {
        return Err(Error::new("xqd_uap_parse failed"));
    }
    assert!(
        family_nwritten <= family.capacity(),
        "xqd_uap_parse wrote too many bytes for family"
    );
    unsafe {
        family.set_len(family_nwritten);
    }
    assert!(
        major_nwritten <= major.capacity(),
        "xqd_uap_parse wrote too many bytes for major"
    );
    unsafe {
        major.set_len(major_nwritten);
    }
    assert!(
        minor_nwritten <= minor.capacity(),
        "xqd_uap_parse wrote too many bytes for minor"
    );
    unsafe {
        minor.set_len(minor_nwritten);
    }
    assert!(
        patch_nwritten <= patch.capacity(),
        "xqd_uap_parse wrote too many bytes for patch"
    );
    unsafe {
        patch.set_len(patch_nwritten);
    }
    Ok((String::from_utf8_lossy(&family).to_string(),
     Some(String::from_utf8_lossy(&major).to_string()),
     Some(String::from_utf8_lossy(&minor).to_string()),
     Some(String::from_utf8_lossy(&patch).to_string())))
}

pub fn init() -> Result<(), Error> {
    use abi::{xqd_init, XqdStatus, XQD_ABI_VERSION};
    let status = unsafe { xqd_init(XQD_ABI_VERSION) };
    if status != XqdStatus::OK {
        Err(Error::new("initialization error: wrong abi version?"))?;
    }
    Ok(())
}