use std::collections::HashMap;

use crate::response::{self, Response};

#[derive(Debug, Clone, Copy)]
pub struct Builder;

#[derive(Debug, Clone, Copy)]
pub struct Status {
    status: response::Status,
}

#[derive(Debug, Clone)]
pub struct Header {
    status: response::Status,
    headers: HashMap<String, Vec<u8>>,
}

impl Builder {
    pub fn new() -> Self {
        Self
    }

    pub fn status(self, status: response::Status) -> Status {
        Status { status }
    }
}

impl Status {
    pub fn headers<K: Into<String>, V: Into<Vec<u8>>, T: IntoIterator<Item = (K, V)>>(
        self,
        headers: T,
    ) -> Header {
        Header {
            status: self.status,
            headers: HashMap::from_iter(
                headers
                    .into_iter()
                    .map(|(key, value)| (key.into(), value.into())),
            ),
        }
    }

    pub fn body(self, body: response::Body) -> Response {
        Response {
            status: self.status,
            headers: HashMap::new(),
            body,
        }
    }
}

impl Header {
    pub fn headers<K: Into<String>, V: Into<Vec<u8>>, T: IntoIterator<Item = (K, V)>>(
        self,
        headers: T,
    ) -> Header {
        Header {
            status: self.status,
            headers: HashMap::from_iter(
                headers
                    .into_iter()
                    .map(|(key, value)| (key.into(), value.into())),
            ),
        }
    }

    pub fn body(self, body: response::Body) -> Response {
        Response {
            status: self.status,
            headers: self.headers,
            body,
        }
    }
}