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use crate::headers::{self, Headers};
use crate::AppendToUrlQuery;
use serde::{Deserialize, Serialize};

#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct NextMarker(String);

impl NextMarker {
    pub fn new(next_marker: String) -> Self {
        Self(next_marker)
    }

    pub fn from_possibly_empty_string(next_marker: Option<String>) -> Option<Self> {
        if let Some("") = next_marker.as_deref() {
            None
        } else {
            next_marker.map(Into::into)
        }
    }

    pub fn as_str(&self) -> &str {
        &self.0
    }

    pub fn append_to_url_query_as_continuation(&self, url: &mut url::Url) {
        url.query_pairs_mut().append_pair("continuation", &self.0);
    }

    pub fn from_header_optional(headers: &Headers) -> crate::Result<Option<Self>> {
        let header_as_str = headers.get_optional_str(&headers::CONTINUATION);

        Ok(header_as_str
            .filter(|h| !h.is_empty())
            .map(|h| NextMarker::new(h.to_owned())))
    }
}

impl AppendToUrlQuery for NextMarker {
    fn append_to_url_query(&self, url: &mut url::Url) {
        url.query_pairs_mut().append_pair("marker", &self.0);
    }
}

impl From<String> for NextMarker {
    fn from(next_marker: String) -> Self {
        Self::new(next_marker)
    }
}

impl From<&str> for NextMarker {
    fn from(next_marker: &str) -> Self {
        Self::new(next_marker.to_owned())
    }
}