use serde::de::DeserializeOwned;

use crate::api::{self, issues, repo, user};

include!(concat!(env!("OUT_DIR"), "/github_fixtures.rs"));

pub(super) fn is_enabled() -> bool {
    std::env::var("NOVEM_GITHUB_FIXTURES")
        .ok()
        .map(|value| {
            !matches!(
                value.trim().to_ascii_lowercase().as_str(),
                "" | "0" | "false" | "off"
            )
        })
        .unwrap_or(false)
}

pub(crate) fn fetch_user() -> Result<user::User, api::Error> {
    parse_fixture("user.fetch", user_fetch())
}

pub(crate) fn list_repos() -> Result<Vec<repo::Repository>, api::Error> {
    parse_fixture("repo.list", repo_list())
}

pub(crate) fn list_pull_requests(
    filter: Option<&str>,
    page: u32,
) -> Result<issues::PullRequestPaginatedResponse, api::Error> {
    let filter = filter.unwrap_or_default();
    let json = issues_pull_requests(filter, page).ok_or_else(|| {
        api::Error::MissingMockFixture(format!("issues.pull_requests filter={filter} page={page}"))
    })?;

    parse_fixture(&format!("issues.pull_requests.{filter}.page{page}"), json)
}

fn parse_fixture<T>(name: &str, json: &'static str) -> Result<T, api::Error>
where
    T: DeserializeOwned,
{
    serde_json::from_str(json).map_err(|err| {
        println!("[mock fixture] failed to parse {name}: {err}");
        api::Error::MalformedResponse(err)
    })
}