use std::io::{self, Write};

use crate::{fomod::GroupType, mod_config_installer::GroupPrompt};

pub fn prompt(p: GroupPrompt) -> Vec<usize> {
    println!("=== {} ===", p.name);
    println!();

    for option in &p.options {
        println!(
            "[{}] {} ({:?}) => {}",
            option.idx + 1, option.name, option.option_type, option.description
        );
    }

    let instruction = match p.select_type {
        GroupType::SelectExactlyOne => "Select one (enter number)",
        GroupType::SelectAtLeastOne => "Select one or more (e.g. 1 2 3)",
        GroupType::SelectAtMostOne => "Select one or none (enter number or 0 for none)",
        GroupType::SelectAny => "Select any (e.g. 1 2 3, or 0 for none)",
        GroupType::SelectAll => {
            println!("  (all options required)");
            return (0..p.options.len()).collect();
        }
    };

    loop {
        println!("=> {}", instruction);
        io::stdout().flush().unwrap();
        let mut input = String::new();
        io::stdin().read_line(&mut input).unwrap();
        input.trim().to_string();

        let choices: Vec<usize> = input
            .split_whitespace()
            .filter_map(|s| s.parse::<usize>().ok())
            .filter(|&n| n > 0 && n <= p.options.len())
            .map(|n| n - 1)
            .collect();

        let valid = match p.select_type {
            GroupType::SelectExactlyOne => {
                choices.len() == 1 // TODO: Check not usable
            }
            GroupType::SelectAtLeastOne => {
                !choices.is_empty() // TODO: Check not usable
            }
            GroupType::SelectAtMostOne => {
                choices.len() <= 1 // TODO: Check not usable
            }
            GroupType::SelectAny => true, // TODO: Check selected not usable,
            GroupType::SelectAll => unreachable!(),
        };

        if valid {
            // TODO: Merge required plugins into final selection
            let final_selection = choices;
            return final_selection;
        }
    }
}