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use crate::{
    frame::AMQPFrame,
    protocol::{
        *,
        basic::gen_properties,
    },
    types::{
        *,
        generation::*,
    },
};

use cookie_factory::{pair, slice, tuple};

use std::io::Write;

/// Serialize a frame in the given buffer
pub fn gen_frame<'a, W: Write + BackToTheBuffer + 'a>(frame: &'a AMQPFrame) -> impl SerializeFn<W> + 'a {
    move |x| match frame {
        AMQPFrame::ProtocolHeader => {
            gen_protocol_header()(x)
        },
        AMQPFrame::Heartbeat(_) => {
            gen_heartbeat_frame()(x)
        },
        AMQPFrame::Method(channel_id, method) => {
            gen_method_frame(*channel_id, method)(x)
        },
        AMQPFrame::Header(channel_id, class_id, header) => {
            gen_content_header_frame(*channel_id, *class_id, header.body_size, &header.properties)(x)
        },
        AMQPFrame::Body(channel_id, data) => {
            gen_content_body_frame(*channel_id, data)(x)
        }
    }
}

fn gen_protocol_header<W: Write>() -> impl SerializeFn<W> {
    pair(slice(metadata::NAME.as_bytes()), slice(&[0, metadata::MAJOR_VERSION, metadata::MINOR_VERSION, metadata::REVISION]))
}

fn gen_heartbeat_frame<W: Write>() -> impl SerializeFn<W> {
    slice(&[constants::FRAME_HEARTBEAT, 0, 0, 0, 0, 0, 0, constants::FRAME_END])
}

fn gen_method_frame<'a, W: Write + BackToTheBuffer + 'a>(channel_id: ShortUInt, class: &'a AMQPClass) -> impl SerializeFn<W> + 'a {
    tuple((gen_short_short_uint(constants::FRAME_METHOD), gen_id(channel_id), gen_with_len(gen_class(class)), gen_short_short_uint(constants::FRAME_END)))
}

fn gen_content_header_frame<'a, W: Write + BackToTheBuffer + 'a>(channel_id: ShortUInt, class_id: ShortUInt, length: LongLongUInt, properties: &'a basic::AMQPProperties) -> impl SerializeFn<W> + 'a {
    tuple((gen_short_short_uint(constants::FRAME_HEADER), gen_id(channel_id), gen_with_len(tuple((gen_id(class_id), gen_short_uint(0 /* weight */), gen_long_long_uint(length), gen_properties(properties)))), gen_short_short_uint(constants::FRAME_END)))
}

fn gen_content_body_frame<'a, W: Write + 'a>(channel_id: ShortUInt, content: &'a [u8]) -> impl SerializeFn<W> + 'a {
    tuple((gen_short_short_uint(constants::FRAME_BODY), gen_id(channel_id), gen_long_uint(content.len() as LongUInt), slice(content), gen_short_short_uint(constants::FRAME_END)))
}