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use std::{collections::HashMap, rc::Rc};

use crate::{protocol::http::DefaultAnswerStatus, sozu_command::state::ClusterId};

#[allow(non_snake_case)]
pub struct DefaultAnswers {
    /// 400
    pub BadRequest: Rc<Vec<u8>>,
    /// 401
    pub Unauthorized: Rc<Vec<u8>>,
    /// 404
    pub NotFound: Rc<Vec<u8>>,
    /// 408
    pub RequestTimeout: Rc<Vec<u8>>,
    /// 413
    pub PayloadTooLarge: Rc<Vec<u8>>,
    /// 502
    pub BadGateway: Rc<Vec<u8>>,
    /// 503
    pub ServiceUnavailable: Rc<Vec<u8>>,
    /// 504
    pub GatewayTimeout: Rc<Vec<u8>>,
}

#[allow(non_snake_case)]
pub struct CustomAnswers {
    pub ServiceUnavailable: Option<Rc<Vec<u8>>>,
}

pub struct HttpAnswers {
    pub default: DefaultAnswers,
    pub custom: HashMap<ClusterId, CustomAnswers>,
}

impl HttpAnswers {
    pub fn new(answer_404: &str, answer_503: &str) -> Self {
        HttpAnswers {
            default: DefaultAnswers {
                BadRequest: Rc::new(Vec::from(
                    &b"HTTP/1.1 400 Bad Request\r\nCache-Control: no-cache\r\nConnection: close\r\n\r\n"[..]
                )),
                Unauthorized: Rc::new(Vec::from(
                    &b"HTTP/1.1 401 Unauthorized\r\nCache-Control: no-cache\r\nConnection: close\r\n\r\n"[..]
                )),
                NotFound: Rc::new(Vec::from(answer_404.as_bytes())),
                RequestTimeout: Rc::new(Vec::from(
                    &b"HTTP/1.1 408 Request Timeout\r\nCache-Control: no-cache\r\nConnection: close\r\n\r\n"[..]
                )),
                PayloadTooLarge: Rc::new(Vec::from(
                    &b"HTTP/1.1 413 Payload Too Large\r\nCache-Control: no-cache\r\nConnection: close\r\n\r\n"[..]
                )),
                BadGateway: Rc::new(Vec::from(
                    &b"HTTP/1.1 502 Bad Gateway\r\nCache-Control: no-cache\r\nConnection: close\r\n\r\n"[..]
                )),
                ServiceUnavailable: Rc::new(Vec::from(answer_503.as_bytes())),
                GatewayTimeout: Rc::new(Vec::from(
                    &b"HTTP/1.1 504 Gateway Timeout\r\nCache-Control: no-cache\r\nConnection: close\r\n\r\n"[..]
                )),
            },
            custom: HashMap::new(),
        }
    }

    pub fn add_custom_answer(&mut self, cluster_id: &str, answer_503: &str) {
        let owned_answer_503 = answer_503.to_owned();
        self.custom
            .entry(cluster_id.to_string())
            .and_modify(|c| c.ServiceUnavailable = Some(Rc::new(owned_answer_503.into_bytes())))
            .or_insert(CustomAnswers {
                ServiceUnavailable: Some(Rc::new(answer_503.to_owned().into_bytes())),
            });
    }

    pub fn remove_custom_answer(&mut self, cluster_id: &str) {
        self.custom.remove(cluster_id);
    }

    pub fn get(&self, answer: DefaultAnswerStatus, cluster_id: Option<&str>) -> Rc<Vec<u8>> {
        match answer {
            DefaultAnswerStatus::Answer301 => panic!("the 301 answer is generated dynamically"),
            DefaultAnswerStatus::Answer400 => self.default.BadRequest.clone(),
            DefaultAnswerStatus::Answer401 => self.default.Unauthorized.clone(),
            DefaultAnswerStatus::Answer404 => self.default.NotFound.clone(),
            DefaultAnswerStatus::Answer408 => self.default.RequestTimeout.clone(),
            DefaultAnswerStatus::Answer413 => self.default.PayloadTooLarge.clone(),
            DefaultAnswerStatus::Answer502 => self.default.BadGateway.clone(),
            DefaultAnswerStatus::Answer503 => cluster_id
                .and_then(|id: &str| self.custom.get(id))
                .and_then(|c| c.ServiceUnavailable.clone())
                .unwrap_or_else(|| self.default.ServiceUnavailable.clone()),
            DefaultAnswerStatus::Answer504 => self.default.GatewayTimeout.clone(),
        }
    }
}