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use std::collections::HashMap;
use std::str;
use hyper::{Body, Response, Request, StatusCode};

use thruster_core::context::Context;
use thruster_core::request::RequestWithParams;
use thruster_middleware::query_params::HasQueryParams;

pub struct HyperRequest(pub Request<Body>);

impl RequestWithParams for HyperRequest {
  fn set_params(&mut self, params: HashMap<String, String>) {
    let extensions = self.0
      .extensions_mut();

    extensions.insert(params);
  }
}

impl Default for HyperRequest {
  fn default() -> Self {
    HyperRequest(Request::default())
  }
}

pub enum SameSite {
  Strict,
  Lax
}

pub struct CookieOptions {
  pub domain: String,
  pub path: String,
  pub expires: u64,
  pub http_only: bool,
  pub max_age: u64,
  pub secure: bool,
  pub signed: bool,
  pub same_site: SameSite
}

impl CookieOptions {
  pub fn default() -> CookieOptions {
    CookieOptions {
      domain: "".to_owned(),
      path: "/".to_owned(),
      expires: 0,
      http_only: false,
      max_age: 0,
      secure: false,
      signed: false,
      same_site: SameSite::Strict
    }
  }
}

pub fn generate_context(request: HyperRequest) -> BasicHyperContext {
  let mut ctx = BasicHyperContext::new();
  ctx.request = request;

  ctx
}

#[derive(Default)]
pub struct BasicHyperContext {
  pub body: Body,
  pub query_params: HashMap<String, String>,
  pub request: HyperRequest,
  pub status: u16,
  pub headers: HashMap<String, String>
}

impl BasicHyperContext {
  pub fn new() -> BasicHyperContext {
    let mut req = Request::builder()
      .body(Body::empty()).unwrap();

    let param_map: HashMap<String, String> = HashMap::new();
    req.extensions_mut().insert(param_map);

    BasicHyperContext {
      body: Body::empty(),
      query_params: HashMap::new(),
      request: HyperRequest(req),
      headers: HashMap::new(),
      status: 200
    }
  }

  ///
  /// Get a a parameter
  ///
  pub fn param(&mut self, key: &str) -> Option<&String> {
    let params = self.request.0
      .extensions_mut()
      .get_mut::<HashMap<String, String>>()
      .unwrap();

    params.get(key)
  }

  ///
  /// Set a header on the response
  ///
  pub fn set(&mut self, key: &str, value: &str) {
    self.headers.insert(key.to_owned(), value.to_owned());
  }

  ///
  /// Remove a header on the response
  ///
  pub fn remove(&mut self, key: &str) {
    self.headers.remove(key);
  }

  ///
  /// Set the response status code
  ///
  pub fn status(&mut self, code: u16) {
    self.status = code;
  }

  ///
  /// Set the response `Content-Type`. A shortcode for
  ///
  /// ```ignore
  /// ctx.set("Content-Type", "some-val");
  /// ```
  ///
  pub fn content_type(&mut self, c_type: &str) {
    self.set("Content-Type", c_type);
  }

  ///
  /// Set up a redirect, will default to 302, but can be changed after
  /// the fact.
  ///
  /// ```ignore
  /// ctx.set("Location", "/some-path");
  /// ctx.status(302);
  /// ```
  ///
  pub fn redirect(&mut self, destination: &str) {
    self.status(302);

    self.set("Location", destination);
  }

  ///
  /// Sets a cookie on the response
  ///
  pub fn cookie(&mut self, name: &str, value: &str, options: &CookieOptions) {
    let cookie_value = match self.headers.get("Set-Cookie") {
      Some(val) => format!("{}, {}", val, self.cookify_options(name, value, &options)),
      None => self.cookify_options(name, value, &options)
    };

    self.set("Set-Cookie", &cookie_value);
  }

  fn cookify_options(&self, name: &str, value: &str, options: &CookieOptions) -> String {
    let mut pieces = vec![format!("Path={}", options.path)];

    if options.expires > 0 {
      pieces.push(format!("Expires={}", options.expires));
    }

    if options.max_age > 0 {
      pieces.push(format!("Max-Age={}", options.max_age));
    }

    if !options.domain.is_empty() {
      pieces.push(format!("Domain={}", options.domain));
    }

    if options.secure {
      pieces.push("Secure".to_owned());
    }

    if options.http_only {
      pieces.push("HttpOnly".to_owned());
    }

    match options.same_site {
      SameSite::Strict => pieces.push("SameSite=Strict".to_owned()),
      SameSite::Lax => pieces.push("SameSite=Lax".to_owned())
    };

    format!("{}={}; {}", name, value, pieces.join(", "))
  }
}

impl Context for BasicHyperContext {
  type Response = Response<Body>;

  fn get_response(self) -> Self::Response {
    let mut response_builder = Response::builder();

    for (key, val) in self.headers {
      let key: &str = &key;
      let val: &str = &val;
      response_builder.header(key, val);
    }

    response_builder.status(StatusCode::from_u16(self.status).unwrap());

    response_builder.body(self.body).unwrap()
  }

  fn set_body(&mut self, body: Vec<u8>) {
    self.body = Body::from(body);
  }
}

impl HasQueryParams for BasicHyperContext {
  fn set_query_params(&mut self, query_params: HashMap<String, String>) {
    self.query_params = query_params;
  }

  fn route(&self) -> &str {
    match self.request.0.uri().path_and_query() {
      Some(val) => val.as_str(),
      None => self.request.0.uri().path()
    }
  }
}