git-disjoint 0.13.1

use std::{collections::HashSet, error::Error, fmt::Display};

use inquire::{formatter::MultiOptionFormatter, MultiSelect};

use crate::issue_group::IssueGroup;

#[derive(Debug)]
pub enum IssueGroupWhitelist {
    Whitelist(HashSet<IssueGroup>),
    WhitelistDNE,
}

#[derive(Debug)]
#[non_exhaustive]
pub struct SelectIssuesError {
    kind: SelectIssuesErrorKind,
}

impl Display for SelectIssuesError {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match &self.kind {
            SelectIssuesErrorKind::Prompt(_) => write!(f, "unable to process issue selection"),
        }
    }
}

impl Error for SelectIssuesError {
    fn source(&self) -> Option<&(dyn Error + 'static)> {
        match &self.kind {
            SelectIssuesErrorKind::Prompt(err) => Some(err),
        }
    }
}

#[derive(Debug)]
pub enum SelectIssuesErrorKind {
    #[non_exhaustive]
    Prompt(inquire::InquireError),
}

impl From<inquire::InquireError> for SelectIssuesError {
    fn from(err: inquire::InquireError) -> Self {
        Self {
            kind: SelectIssuesErrorKind::Prompt(err),
        }
    }
}

// TODO: refactor into a better abstraction -- this seems coupled with IssueGroupMap
pub fn prompt_user<'a, I: Iterator<Item = &'a IssueGroup>>(
    choices: I,
) -> Result<HashSet<IssueGroup>, SelectIssuesError> {
    let formatter: MultiOptionFormatter<&IssueGroup> =
        &|selected| format!("Selected: {selected:?}");

    Ok(
        MultiSelect::new("Select the issues to create PRs for:", choices.collect())
            .with_formatter(formatter)
            .prompt()?
            .into_iter()
            .cloned()
            .collect(),
    )
}