use actix_web::{web, HttpRequest, HttpResponse};
use crate::controllers::routes::RequestResult;
use crate::data::http_error::HttpError;
use std::convert::TryFrom;
use std::error::Error;
use serde::Serialize;
use crate::data::error::{ResultBoxError};
use std::collections::HashMap;

/// Http request handler
///
/// @author Pierre Hubert

/// Single request body  value
pub struct RequestValue {
    pub string: Option<String>
}

impl RequestValue {
    /// Build a string value
    pub fn string(s: String) -> RequestValue {
        RequestValue {
            string: Some(s)
        }
    }
}

#[derive(Serialize)]
struct SuccessMessage {
    success: String
}

pub struct HttpRequestHandler {
    request: web::HttpRequest,
    body: HashMap<String, RequestValue>,
    response: Option<web::HttpResponse>,
}

impl HttpRequestHandler {
    /// Construct a new request handler
    pub fn new(req: HttpRequest, body: HashMap<String, RequestValue>) -> HttpRequestHandler {
        HttpRequestHandler {
            request: req,
            body,
            response: None,
        }
    }

    /// Check if a response has been set for this request
    pub fn has_response(&self) -> bool {
        self.response.is_some()
    }

    /// Get the response status code, eg. 200 or 404
    pub fn response_status_code(&self) -> u16 {
        self.response.as_ref().unwrap().status().as_u16()
    }

    /// Take the response from this struct
    pub fn response(self) -> HttpResponse {
        self.response.unwrap()
    }

    /// Success message
    pub fn success(&mut self, message: &str) -> RequestResult {
        self.response = Some(HttpResponse::Ok().json(SuccessMessage {
            success: message.to_string()
        }));
        Ok(())
    }

    /// Internal error message
    pub fn internal_error(&mut self, error: Box<dyn Error>) -> RequestResult {
        self.response = Some(HttpResponse::InternalServerError().json(
            HttpError::internal_error("Internal server error.")));
        Err(Box::try_from(actix_web::error::ErrorInternalServerError(error)).unwrap())
    }

    /// Bad request
    pub fn bad_request(&mut self, message: String) -> RequestResult {
        self.response = Some(HttpResponse::BadRequest().json(
            HttpError::bad_request(&message)));
        Err(Box::try_from(actix_web::error::ErrorBadRequest(message)).unwrap())
    }

    /// Get the path of the request
    pub fn request_path(&self) -> String {
        self.request.path().to_string()
    }

    /// Check login tokens
    pub fn check_client_token(&mut self) -> Result<(), Box<dyn Error>> {
        println!("me = {}", self.post_string("me")?);

        Ok(())
    }

    /// Check if a POST parameter was present in the request or not
    pub fn has_post_parameter(&self, name: &str) -> bool {
        self.body.contains_key(name)
    }

    /// Get a post parameter
    pub fn post_parameter(&mut self, name: &str) -> ResultBoxError<&RequestValue> {
        if !self.has_post_parameter(name) {
            self.bad_request(format!("POST parameter '{}' not found in request!", name))?;
        }

        Ok(self.body.get(name).unwrap())
    }

    /// Get a post string
    pub fn post_string(&mut self, name: &str) -> Result<String, Box<dyn Error>> {
        let param = self.post_parameter(name)?;

        match &param.string {
            None => Err(Box::new(actix_web::error::ErrorBadRequest(format!("{} is not a string!", name)))),
            Some(s) => Ok(s.to_string())
        }
    }
}