use std::io::Write;
use std::path::PathBuf;

use crate::{CurrentTaskInfo, Task};

#[derive(clap::Args)]
pub struct Args {
    #[clap(short, long)]
    link: Option<String>,
    #[clap(long)]
    no_link: bool,

    #[clap(short, long)]
    name: Option<String>,

    idx: usize,
}

pub struct Request {
    pub args: Args,
    pub current_task_info: Option<CurrentTaskInfo>,
    pub tasks: Vec<Task>,
    pub tasks_file_path: PathBuf,
}

pub fn execute(mut req: Request) {
    if req.current_task_info.is_some() {
        panic!("You can edit task only when you don't have an active task, yet");
    }

    let idx = req.args.idx;
    if idx == 0 || idx > req.tasks.len() {
        panic!("invalid index");
    }

    let mut task = &mut req.tasks[idx - 1];
    if let Some(name) = req.args.name {
        task.name = name;
    }
    if let Some(link) = req.args.link {
        task.link = Some(link);
    } else if req.args.no_link {
        task.link = None;
    }

    let mut file = std::fs::File::create(&req.tasks_file_path).unwrap();
    file.write_all(&serde_json::to_vec(&req.tasks).unwrap())
        .unwrap();

    println!("changed");
}