module picohttpparser

$if !windows {
    #include <sys/socket.h>
}

pub struct Response {
pub:
    fd        int
    date      &u8 = unsafe { nil }
    buf_start &u8 = unsafe { nil }
pub mut:
    buf &u8 = unsafe { nil }
}

@[inline]
pub fn (mut r Response) write_string(s string) {
    unsafe {
        vmemcpy(r.buf, s.str, s.len)
        r.buf += s.len
    }
}

@[inline]
pub fn (mut r Response) http_ok() &Response {
    r.write_string('HTTP/1.1 200 OK\r\n')
    return unsafe { r }
}

@[inline]
pub fn (mut r Response) header(k string, v string) &Response {
    r.write_string(k)
    r.write_string(': ')
    r.write_string(v)
    r.write_string('\r\n')
    return unsafe { r }
}

@[inline]
pub fn (mut r Response) header_date() &Response {
    r.write_string('Date: ')
    unsafe {
        vmemcpy(r.buf, r.date, 29)
        r.buf += 29
    }
    r.write_string('\r\n')
    return unsafe { r }
}

@[inline]
pub fn (mut r Response) header_server() &Response {
    r.write_string('Server: V\r\n')
    return unsafe { r }
}

@[inline]
pub fn (mut r Response) content_type(s string) &Response {
    r.write_string('Content-Type: ')
    r.write_string(s)
    r.write_string('\r\n')
    return unsafe { r }
}

@[inline]
pub fn (mut r Response) html() &Response {
    r.write_string('Content-Type: text/html\r\n')
    return unsafe { r }
}

@[inline]
pub fn (mut r Response) plain() &Response {
    r.write_string('Content-Type: text/plain\r\n')
    return unsafe { r }
}

@[inline]
pub fn (mut r Response) json() &Response {
    r.write_string('Content-Type: application/json\r\n')
    return unsafe { r }
}

@[inline]
pub fn (mut r Response) body(body string) {
    r.write_string('Content-Length: ')
    unsafe {
        r.buf += u64toa(r.buf, u64(body.len)) or { panic(err) }
    }
    r.write_string('\r\n\r\n')
    r.write_string(body)
}

@[inline]
pub fn (mut r Response) http_404() {
    r.write_string('HTTP/1.1 404 Not Found\r\nContent-Length: 0\r\n\r\n')
}

@[inline]
pub fn (mut r Response) http_405() {
    r.write_string('HTTP/1.1 405 Method Not Allowed\r\nContent-Length: 0\r\n\r\n')
}

@[inline]
pub fn (mut r Response) http_500() {
    r.write_string('HTTP/1.1 500 Internal Server Error\r\nContent-Length: 0\r\n\r\n')
}

@[inline]
pub fn (mut r Response) raw(response string) {
    r.write_string(response)
}

fn C.send(sockfd i32, buf voidptr, len usize, flags i32) i32

@[inline]
pub fn (mut r Response) end() int {
    n := int(i64(r.buf) - i64(r.buf_start))
    // use send instead of write for windows compatibility
    if C.send(r.fd, r.buf_start, n, 0) != n {
        return -1
    }
    return n
}