use std::collections::HashMap;

use tiny_http::Request;

pub trait Url {
    fn get_url_without_parameters(&self) -> String;
}

impl Url for Request {
    fn get_url_without_parameters(&self) -> String {
        self.url().split("?").next().unwrap().to_string()
    }
}

pub trait Parameters {
    fn get_post_parameters(&mut self) -> HashMap<String, String>;
    fn get_get_parameters(&mut self) -> Option<HashMap<String, String>>;
}

impl Parameters for Request {
    fn get_post_parameters(&mut self) -> HashMap<String, String> {
        let mut content = String::new();
        self.as_reader().read_to_string(&mut content).unwrap();

        let mut key_value_pairs = HashMap::new();

        let parts = content.split("&");

        for part in parts {
            let mut key_value = part.split("=");

            key_value_pairs.insert(key_value.next().unwrap().to_string(), key_value.next().unwrap().to_string());
        }

        key_value_pairs
    }

    fn get_get_parameters(&mut self) -> Option<HashMap<String, String>> {
        let content = self.url().split("?").nth(1);

        if content.is_none() {
            return None;
        }

        let content = content.unwrap();

        let mut key_value_pairs = HashMap::new();

        let parts = content.split("&");
        for part in parts {
            let mut key_value = part.split("=");

            key_value_pairs.insert(key_value.next().unwrap().to_string(), key_value.next().unwrap().to_string());
        }

        Some(key_value_pairs)
    }
}

#[cfg(test)]
mod tests {
    use crate::entities::request::*;
    use tiny_http::{Request, TestRequest};

    #[test]
    fn test_get_url_without_parameters() {
        let request = Request::from(TestRequest::new().with_path("/test?key=value"));

        let actual = request.get_url_without_parameters();

        assert_eq!(actual, "/test");

        let request2 = Request::from(TestRequest::new().with_path("/test2"));

        assert_eq!(request2.get_url_without_parameters(), "/test2");
    }

    #[test]
    fn test_get_post_parameters() {
        let test_request = TestRequest::new();
        let test_request = test_request.with_body("a=b&c=d");

        let actual = Request::from(test_request).get_post_parameters();
        let mut expected = HashMap::new();
        expected.insert("a".to_string(), "b".to_string());
        expected.insert("c".to_string(), "d".to_string());

        assert_eq!(actual, expected);
    }

    #[test]
    fn test_get_get_parameters_with_no_get_parameters() {
        let test_request = TestRequest::new();
        let test_request = test_request.with_path("/test");

        let actual = Request::from(test_request).get_get_parameters();

        assert_eq!(actual, None);
    }

    #[test]
    fn test_get_get_parameters() {
        let test_request = TestRequest::new();
        let test_request = test_request.with_path("/test?a=b&c=d");

        let actual = Request::from(test_request).get_get_parameters();
        let mut expected = HashMap::new();
        expected.insert("a".to_string(), "b".to_string());
        expected.insert("c".to_string(), "d".to_string());

        assert_eq!(actual, Some(expected));
    }
}