//! `view <number> [repo]` — dump title + body + all comments as
//! markdown.

use anyhow::Result;
use clap::Args as ClapArgs;
use serde_json::Value;

use crate::client::Client;

#[derive(ClapArgs)]
pub struct Args {
    /// Issue or PR number.
    number: u64,
}

/// # Errors
///
/// Propagates any transport error from the Forgejo REST call
/// (network unreachable, 4xx/5xx response, token missing/invalid)
/// and any I/O error from writing the response to stdout.
pub fn run(client: &Client, args: Args) -> Result<()> {
    let repo = client.repo();
    let issue = client.get_json(&format!("/repos/{repo}/issues/{}", args.number))?;
    let title = issue.get("title").and_then(Value::as_str).unwrap_or("");
    let body = issue.get("body").and_then(Value::as_str).unwrap_or("");
    let state = issue.get("state").and_then(Value::as_str).unwrap_or("?");
    let user = issue
        .get("user")
        .and_then(|u| u.get("login"))
        .and_then(Value::as_str)
        .unwrap_or("?");
    let kind = if issue.get("pull_request").is_some_and(|p| !p.is_null()) {
        "PR"
    } else {
        "issue"
    };
    println!("# {kind} #{} [{state}] by {user}", args.number);
    println!("{title}");
    if !body.is_empty() {
        println!();
        println!("{body}");
    }
    let comments = client.get_json(&format!(
        "/repos/{repo}/issues/{}/comments?limit=50",
        args.number
    ))?;
    let arr = comments.as_array().cloned().unwrap_or_default();
    if !arr.is_empty() {
        println!();
        println!("---");
        println!("## Comments ({})", arr.len());
        println!();
        for c in &arr {
            let cu = c
                .get("user")
                .and_then(|u| u.get("login"))
                .and_then(Value::as_str)
                .unwrap_or("?");
            let cb = c.get("body").and_then(Value::as_str).unwrap_or("");
            println!("**{cu}**: {cb}");
            println!();
        }
    }
    Ok(())
}