/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */

//! Liberally derived from the [Firefox JS implementation]
//! (http://mxr.mozilla.org/mozilla-central/source/toolkit/devtools/server/actors/webconsole.js).
//! Handles interaction with the remote web console on network events (HTTP requests, responses) in Servo.

use std::net::TcpStream;

use devtools_traits::{HttpRequest as DevtoolsHttpRequest, HttpResponse as DevtoolsHttpResponse};
use headers::{ContentType, Cookie, HeaderMapExt};
use http::{header, HeaderMap, Method, StatusCode};
use serde::Serialize;
use serde_json::{Map, Value};
use time::Tm;

use crate::actor::{Actor, ActorMessageStatus, ActorRegistry};
use crate::protocol::JsonPacketStream;
use crate::StreamId;

struct HttpRequest {
    url: String,
    method: Method,
    headers: HeaderMap,
    body: Option<Vec<u8>>,
    startedDateTime: Tm,
    timeStamp: i64,
    connect_time: u64,
    send_time: u64,
}

struct HttpResponse {
    headers: Option<HeaderMap>,
    status: Option<(StatusCode, String)>,
    body: Option<Vec<u8>>,
}

pub struct NetworkEventActor {
    pub name: String,
    request: HttpRequest,
    response: HttpResponse,
    is_xhr: bool,
}

#[derive(Serialize)]
pub struct EventActor {
    pub actor: String,
    pub url: String,
    pub method: String,
    pub startedDateTime: String,
    pub timeStamp: i64,
    pub isXHR: bool,
    pub private: bool,
}

#[derive(Serialize)]
pub struct ResponseCookiesMsg {
    pub cookies: usize,
}

#[derive(Serialize)]
pub struct ResponseStartMsg {
    pub httpVersion: String,
    pub remoteAddress: String,
    pub remotePort: u32,
    pub status: String,
    pub statusText: String,
    pub headersSize: usize,
    pub discardResponseBody: bool,
}

#[derive(Serialize)]
pub struct ResponseContentMsg {
    pub mimeType: String,
    pub contentSize: u32,
    pub transferredSize: u32,
    pub discardResponseBody: bool,
}

#[derive(Serialize)]
pub struct ResponseHeadersMsg {
    pub headers: usize,
    pub headersSize: usize,
}

#[derive(Serialize)]
pub struct RequestCookiesMsg {
    pub cookies: usize,
}

#[derive(Serialize)]
pub struct RequestHeadersMsg {
    headers: usize,
    headersSize: usize,
}

#[derive(Serialize)]
struct GetRequestHeadersReply {
    from: String,
    headers: Vec<Header>,
    headerSize: usize,
    rawHeaders: String,
}

#[derive(Serialize)]
struct Header {
    name: String,
    value: String,
}

#[derive(Serialize)]
struct GetResponseHeadersReply {
    from: String,
    headers: Vec<Header>,
    headerSize: usize,
    rawHeaders: String,
}

#[derive(Serialize)]
struct GetResponseContentReply {
    from: String,
    content: Option<Vec<u8>>,
    contentDiscarded: bool,
}

#[derive(Serialize)]
struct GetRequestPostDataReply {
    from: String,
    postData: Option<Vec<u8>>,
    postDataDiscarded: bool,
}

#[derive(Serialize)]
struct GetRequestCookiesReply {
    from: String,
    cookies: Vec<u8>,
}

#[derive(Serialize)]
struct GetResponseCookiesReply {
    from: String,
    cookies: Vec<u8>,
}

#[derive(Serialize)]
struct Timings {
    blocked: u32,
    dns: u32,
    connect: u64,
    send: u64,
    wait: u32,
    receive: u32,
}

#[derive(Serialize)]
struct GetEventTimingsReply {
    from: String,
    timings: Timings,
    totalTime: u64,
}

#[derive(Serialize)]
struct SecurityInfo {
    state: String,
}

#[derive(Serialize)]
struct GetSecurityInfoReply {
    from: String,
    securityInfo: SecurityInfo,
}

impl Actor for NetworkEventActor {
    fn name(&self) -> String {
        self.name.clone()
    }

    fn handle_message(
        &self,
        _registry: &ActorRegistry,
        msg_type: &str,
        _msg: &Map<String, Value>,
        stream: &mut TcpStream,
        _id: StreamId,
    ) -> Result<ActorMessageStatus, ()> {
        Ok(match msg_type {
            "getRequestHeaders" => {
                let mut headers = Vec::new();
                let mut rawHeadersString = "".to_owned();
                let mut headersSize = 0;
                for (name, value) in self.request.headers.iter() {
                    let value = &value.to_str().unwrap().to_string();
                    rawHeadersString = rawHeadersString + name.as_str() + ":" + &value + "\r\n";
                    headersSize += name.as_str().len() + value.len();
                    headers.push(Header {
                        name: name.as_str().to_owned(),
                        value: value.to_owned(),
                    });
                }
                let msg = GetRequestHeadersReply {
                    from: self.name(),
                    headers: headers,
                    headerSize: headersSize,
                    rawHeaders: rawHeadersString,
                };
                let _ = stream.write_json_packet(&msg);
                ActorMessageStatus::Processed
            },
            "getRequestCookies" => {
                let mut cookies = Vec::new();

                for cookie in self.request.headers.get_all(header::COOKIE) {
                    if let Ok(cookie_value) = String::from_utf8(cookie.as_bytes().to_vec()) {
                        cookies = cookie_value.into_bytes();
                    }
                }

                let msg = GetRequestCookiesReply {
                    from: self.name(),
                    cookies: cookies,
                };
                let _ = stream.write_json_packet(&msg);
                ActorMessageStatus::Processed
            },
            "getRequestPostData" => {
                let msg = GetRequestPostDataReply {
                    from: self.name(),
                    postData: self.request.body.clone(),
                    postDataDiscarded: false,
                };
                let _ = stream.write_json_packet(&msg);
                ActorMessageStatus::Processed
            },
            "getResponseHeaders" => {
                if let Some(ref response_headers) = self.response.headers {
                    let mut headers = vec![];
                    let mut rawHeadersString = "".to_owned();
                    let mut headersSize = 0;
                    for (name, value) in response_headers.iter() {
                        headers.push(Header {
                            name: name.as_str().to_owned(),
                            value: value.to_str().unwrap().to_owned(),
                        });
                        headersSize += name.as_str().len() + value.len();
                        rawHeadersString.push_str(name.as_str());
                        rawHeadersString.push_str(":");
                        rawHeadersString.push_str(value.to_str().unwrap());
                        rawHeadersString.push_str("\r\n");
                    }
                    let msg = GetResponseHeadersReply {
                        from: self.name(),
                        headers: headers,
                        headerSize: headersSize,
                        rawHeaders: rawHeadersString,
                    };
                    let _ = stream.write_json_packet(&msg);
                }
                ActorMessageStatus::Processed
            },
            "getResponseCookies" => {
                let mut cookies = Vec::new();
                // TODO: This seems quite broken
                for cookie in self.request.headers.get_all(header::SET_COOKIE) {
                    if let Ok(cookie_value) = String::from_utf8(cookie.as_bytes().to_vec()) {
                        cookies = cookie_value.into_bytes();
                    }
                }

                let msg = GetResponseCookiesReply {
                    from: self.name(),
                    cookies: cookies,
                };
                let _ = stream.write_json_packet(&msg);
                ActorMessageStatus::Processed
            },
            "getResponseContent" => {
                let msg = GetResponseContentReply {
                    from: self.name(),
                    content: self.response.body.clone(),
                    contentDiscarded: self.response.body.is_none(),
                };
                let _ = stream.write_json_packet(&msg);
                ActorMessageStatus::Processed
            },
            "getEventTimings" => {
                // TODO: This is a fake timings msg
                let timingsObj = Timings {
                    blocked: 0,
                    dns: 0,
                    connect: self.request.connect_time,
                    send: self.request.send_time,
                    wait: 0,
                    receive: 0,
                };
                let total = timingsObj.connect + timingsObj.send;
                // TODO: Send the correct values for all these fields.
                let msg = GetEventTimingsReply {
                    from: self.name(),
                    timings: timingsObj,
                    totalTime: total,
                };
                let _ = stream.write_json_packet(&msg);
                ActorMessageStatus::Processed
            },
            "getSecurityInfo" => {
                // TODO: Send the correct values for securityInfo.
                let msg = GetSecurityInfoReply {
                    from: self.name(),
                    securityInfo: SecurityInfo {
                        state: "insecure".to_owned(),
                    },
                };
                let _ = stream.write_json_packet(&msg);
                ActorMessageStatus::Processed
            },
            _ => ActorMessageStatus::Ignored,
        })
    }
}

impl NetworkEventActor {
    pub fn new(name: String) -> NetworkEventActor {
        NetworkEventActor {
            name: name,
            request: HttpRequest {
                url: String::new(),
                method: Method::GET,
                headers: HeaderMap::new(),
                body: None,
                startedDateTime: time::now(),
                timeStamp: time::get_time().sec,
                send_time: 0,
                connect_time: 0,
            },
            response: HttpResponse {
                headers: None,
                status: None,
                body: None,
            },
            is_xhr: false,
        }
    }

    pub fn add_request(&mut self, request: DevtoolsHttpRequest) {
        self.request.url = request.url.as_str().to_owned();

        self.request.method = request.method.clone();
        self.request.headers = request.headers.clone();
        self.request.body = request.body;
        self.request.startedDateTime = request.startedDateTime;
        self.request.timeStamp = request.timeStamp;
        self.request.connect_time = request.connect_time;
        self.request.send_time = request.send_time;
        self.is_xhr = request.is_xhr;
    }

    pub fn add_response(&mut self, response: DevtoolsHttpResponse) {
        self.response.headers = response.headers.clone();
        self.response.status = response.status.as_ref().map(|&(s, ref st)| {
            let status_text = String::from_utf8_lossy(st).into_owned();
            (StatusCode::from_u16(s).unwrap(), status_text)
        });
        self.response.body = response.body;
    }

    pub fn event_actor(&self) -> EventActor {
        // TODO: Send the correct values for startedDateTime, isXHR, private
        EventActor {
            actor: self.name(),
            url: self.request.url.clone(),
            method: format!("{}", self.request.method),
            startedDateTime: format!("{}", self.request.startedDateTime.rfc3339()),
            timeStamp: self.request.timeStamp,
            isXHR: self.is_xhr,
            private: false,
        }
    }

    pub fn response_start(&self) -> ResponseStartMsg {
        // TODO: Send the correct values for all these fields.
        let hSizeOption = self.response.headers.as_ref().map(|headers| headers.len());
        let hSize = hSizeOption.unwrap_or(0);
        let (status_code, status_message) = self
            .response
            .status
            .as_ref()
            .map_or((0, "".to_owned()), |(code, text)| {
                (code.as_u16(), text.clone())
            });
        // TODO: Send the correct values for remoteAddress and remotePort and http_version.
        ResponseStartMsg {
            httpVersion: "HTTP/1.1".to_owned(),
            remoteAddress: "63.245.217.43".to_owned(),
            remotePort: 443,
            status: status_code.to_string(),
            statusText: status_message,
            headersSize: hSize,
            discardResponseBody: false,
        }
    }

    pub fn response_content(&self) -> ResponseContentMsg {
        let mut mString = "".to_owned();
        if let Some(ref headers) = self.response.headers {
            mString = match headers.typed_get::<ContentType>() {
                Some(ct) => ct.to_string(),
                _ => "".to_owned(),
            };
        }
        // TODO: Set correct values when response's body is sent to the devtools in http_loader.
        ResponseContentMsg {
            mimeType: mString,
            contentSize: 0,
            transferredSize: 0,
            discardResponseBody: true,
        }
    }

    pub fn response_cookies(&self) -> ResponseCookiesMsg {
        let mut cookies_size = 0;
        if let Some(ref headers) = self.response.headers {
            cookies_size = match headers.typed_get::<Cookie>() {
                Some(ref cookie) => cookie.len(),
                _ => 0,
            };
        }
        ResponseCookiesMsg {
            cookies: cookies_size,
        }
    }

    pub fn response_headers(&self) -> ResponseHeadersMsg {
        let mut headers_size = 0;
        let mut headers_byte_count = 0;
        if let Some(ref headers) = self.response.headers {
            headers_size = headers.len();
            for (name, value) in headers.iter() {
                headers_byte_count += name.as_str().len() + value.len();
            }
        }
        ResponseHeadersMsg {
            headers: headers_size,
            headersSize: headers_byte_count,
        }
    }

    pub fn request_headers(&self) -> RequestHeadersMsg {
        let size = self.request.headers.iter().fold(0, |acc, (name, value)| {
            acc + name.as_str().len() + value.len()
        });
        RequestHeadersMsg {
            headers: self.request.headers.len(),
            headersSize: size,
        }
    }

    pub fn request_cookies(&self) -> RequestCookiesMsg {
        let cookies_size = match self.request.headers.typed_get::<Cookie>() {
            Some(ref cookie) => cookie.len(),
            _ => 0,
        };
        RequestCookiesMsg {
            cookies: cookies_size,
        }
    }

    pub fn total_time(&self) -> u64 {
        self.request.connect_time + self.request.send_time
    }
}