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#[cfg(test)]
pub mod tests;
pub mod example;

use std::io::prelude::*;
use std::borrow::Borrow;
use std::net::{IpAddr, SocketAddr, TcpListener};
use std::str::FromStr;

use crate::request::{METHOD, Request};
use crate::response::{Response, STATUS_CODE_REASON_PHRASE};
use crate::app::App;
use crate::application::Application;
use crate::core::New;
use crate::entry_point::{bootstrap, get_ip_port_thread_count, get_request_allocation_size, set_default_values};
use crate::header::Header;
use crate::log::Log;
use crate::mime_type::MimeType;
use crate::range::{ContentRange, Range};
use crate::symbol::SYMBOL;
use crate::thread_pool::ThreadPool;

pub struct Server {}
impl Server {
    pub fn process_request(mut stream: impl Read + Write + Unpin, peer_addr: SocketAddr) -> Vec<u8> {
        let request_allocation_size = get_request_allocation_size();
        let mut buffer = vec![0; request_allocation_size as usize];
        let boxed_read = stream.read(&mut buffer);
        if boxed_read.is_err() {
            let message = boxed_read.err().unwrap().to_string();
            eprintln!("unable to read TCP stream {}", &message);

            let raw_response = Server::bad_request_response(message);
            let boxed_stream = stream.write(raw_response.borrow());
            if boxed_stream.is_ok() {
                stream.flush().unwrap();
            };
            return raw_response;
        }

        boxed_read.unwrap();
        let request : &[u8] = &buffer;

        // let raw_request = String::from_utf8(Vec::from(request)).unwrap();
        // println!("\n\n______{}______\n\n", raw_request);


        let boxed_request = Request::parse_request(request);
        if boxed_request.is_err() {
            let message = boxed_request.err().unwrap();
            eprintln!("unable to parse request: {}", &message);

            let raw_response = Server::bad_request_response(message);
            let boxed_stream = stream.write(raw_response.borrow());
            if boxed_stream.is_ok() {
                stream.flush().unwrap();
            };
            return raw_response;
        }


        let request: Request = boxed_request.unwrap();
        let (response, request) = App::handle_request(request);


        let log_request_response = Log::request_response(&request, &response, &peer_addr);
        println!("{}", log_request_response);
        let raw_response = Response::generate_response(response, request);

        let boxed_stream = stream.write(raw_response.borrow());
        if boxed_stream.is_ok() {
            stream.flush().unwrap();
        };

        raw_response
    }

    pub fn bad_request_response(message: String) -> Vec<u8> {
        let error_request = Request {
            method: METHOD.get.to_string(),
            request_uri: "".to_string(),
            http_version: "".to_string(),
            headers: vec![],
            body: vec![],
        };

        let size = message.chars().count() as u64;
        let content_range = ContentRange {
            unit: Range::BYTES.to_string(),
            range: Range { start: 0, end: size },
            size: size.to_string(),
            body: Vec::from(message.as_bytes()),
            content_type: MimeType::TEXT_PLAIN.to_string(),
        };

        let header_list = Header::get_header_list(&error_request);
        let error_response: Response = Response::get_response(
            STATUS_CODE_REASON_PHRASE.n400_bad_request,
            Some(header_list),
            Some(vec![content_range])
        );

        let response = Response::generate_response(error_response, error_request);
        return response;
    }

    pub fn process(mut stream: impl Read + Write + Unpin,
                   connection: ConnectionInfo,
                   app: impl Application) -> Result<(), String> {

        let request_allocation_size = connection.request_size;
        let mut buffer = vec![0; request_allocation_size as usize];
        let boxed_read = stream.read(&mut buffer);
        if boxed_read.is_err() {
            let read_message = boxed_read.err().unwrap().to_string();
            let raw_response = Server::bad_request_response(read_message.clone());
            let boxed_stream = stream.write(raw_response.borrow());
            if boxed_stream.is_ok() {
                stream.flush().unwrap();
            } else {
                let write_message = boxed_stream.err().unwrap().to_string();
                let combined_error = [read_message.clone(), SYMBOL.comma.to_string(), write_message].join(SYMBOL.empty_string);
                return Err(combined_error);
            };

            return Err(read_message);
        }

        boxed_read.unwrap();
        let request : &[u8] = &buffer;

        // let raw_request = String::from_utf8(Vec::from(request)).unwrap();
        // println!("\n\n______{}______\n\n", raw_request);


        let boxed_request = Request::parse(request);
        if boxed_request.is_err() {
            let message = boxed_request.err().unwrap();

            let raw_response = Server::bad_request_response(message.clone());
            let boxed_stream = stream.write(raw_response.borrow());
            if boxed_stream.is_ok() {
                stream.flush().unwrap();
            } else {
                let write_message = boxed_stream.err().unwrap().to_string();
                let combined_error = [message, SYMBOL.comma.to_string(), write_message].join(SYMBOL.empty_string);
                return Err(combined_error);
            };
            return Err(message);
        }


        let request: Request = boxed_request.unwrap();

        let app_processing = app.execute(&request, &connection);
        if app_processing.is_err() {
            let message = app_processing.as_ref().err().unwrap().to_string();
            let response = Server::bad_request_response(message);

            let boxed_stream = stream.write(response.borrow());
            if boxed_stream.is_ok() {
                stream.flush().unwrap();
            } else {
                let write_message = boxed_stream.err().unwrap().to_string();
                return Err(write_message);
            };
        }
        let response = app_processing.unwrap();


        let client = connection.client;
        let client_addr = SocketAddr::new(IpAddr::from_str(client.ip.as_str()).unwrap(), client.port as u16);
        let log_request_response = Log::request_response(&request, &response, &client_addr);
        println!("{}", log_request_response);

        let raw_response = Response::generate_response(response, request);

        let boxed_stream = stream.write(raw_response.borrow());
        if boxed_stream.is_ok() {
            stream.flush().unwrap();
        } else {
            let write_message = boxed_stream.err().unwrap().to_string();
            return Err(write_message);
        };

        Ok(())
    }

    pub fn setup() -> Result<(TcpListener, ThreadPool), String> {
        let info = Log::info("Rust Web Server");
        println!("{}", info);

        let usage_info = Log::usage_information();
        println!("{}", usage_info);


        println!("RWS Configuration Start: \n");

        set_default_values();
        bootstrap();

        println!("\nRWS Configuration End\n\n");


        let (ip, port, thread_count) = get_ip_port_thread_count();


        let mut ip_readable = ip.to_string();

        if ip.contains(":") {
            ip_readable = [SYMBOL.opening_square_bracket, &ip, SYMBOL.closing_square_bracket].join("");
        }

        let bind_addr = [ip_readable, SYMBOL.colon.to_string(), port.to_string()].join(SYMBOL.empty_string);
        println!("Setting up http://{}...", &bind_addr);

        let boxed_listener = TcpListener::bind(&bind_addr);
        if boxed_listener.is_err() {
            let message = format!("unable to set up TCP listener: {}", boxed_listener.err().unwrap());
            return Err(message);
        }

        let listener = boxed_listener.unwrap();
        let pool = ThreadPool::new(thread_count as usize);


        let server_url_thread_count = Log::server_url_thread_count("http", &bind_addr, thread_count);
        println!("{}", server_url_thread_count);

        Ok((listener, pool))
    }

    pub fn run(listener : TcpListener,
               pool: ThreadPool,
               app: impl Application + New + Send + 'static + Copy) {
        for boxed_stream in listener.incoming() {
            if boxed_stream.is_err() {
                eprintln!("unable to get TCP stream: {}", boxed_stream.err().unwrap());
                return;
            }

            let stream = boxed_stream.unwrap();

            print!("Connection established, ");

            let boxed_local_addr = stream.local_addr();
            if boxed_local_addr.is_ok() {
                print!("local addr: {}", boxed_local_addr.unwrap())
            } else {
                eprintln!("\nunable to read local addr");
                return;
            }

            let boxed_peer_addr = stream.peer_addr();
            if boxed_peer_addr.is_err() {
                eprintln!("\nunable to read peer addr");
                return;
            }
            let peer_addr = boxed_peer_addr.unwrap();
            print!(", peer addr: {}\n", peer_addr.to_string());

            let (server_ip, server_port, _thread_count) = get_ip_port_thread_count();
            let client_ip = peer_addr.ip().to_string();
            let client_port = peer_addr.port() as i32;
            let request_allocation_size = get_request_allocation_size();

            let connection = ConnectionInfo {
                client: Address {
                    ip: client_ip.to_string(),
                    port: client_port
                },
                server: Address {
                    ip: server_ip,
                    port: server_port
                },
                request_size: request_allocation_size,
            };



            pool.execute(move || {
                let boxed_process = Server::process(stream, connection, app);
                if boxed_process.is_err() {
                    let message = boxed_process.err().unwrap();
                    eprintln!("{}", message);
                }
            });

        }


    }

}

#[derive(Clone)]
pub struct ConnectionInfo {
    pub client: Address,
    pub server: Address,
    pub request_size: i64
}

#[derive(Clone)]
pub struct Address {
    pub ip: String,
    pub port: i32
}