//! `attach-issue <number> <file>` and `attach-comment <comment-id>
//! <file>` — upload a file as an attachment. Prints the browser
//! download URL.

use std::path::{Path, PathBuf};

use anyhow::{Context, Result, bail};
use clap::Args as ClapArgs;
use forgejo_api::structs::{
    Attachment, IssueCreateIssueAttachmentQuery, IssueCreateIssueCommentAttachmentQuery,
};

use crate::client::{Client, index};

#[derive(ClapArgs)]
pub struct IssueArgs {
    /// Issue number.
    number: u64,
    /// File path to upload.
    file: PathBuf,
}

#[derive(ClapArgs)]
pub struct CommentArgs {
    /// Comment id.
    id: u64,
    /// File path to upload.
    file: PathBuf,
}

/// # Errors
///
/// Returns an error if the input file doesn't exist or can't be
/// read. 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 browser download URL to stdout.
pub fn run_issue(client: &Client, args: IssueArgs) -> Result<()> {
    if !args.file.is_file() {
        bail!(
            "hive-forge attach-issue: file not found: {}",
            args.file.display()
        );
    }
    let (owner, name) = client.owner_repo()?;
    let bytes = read_file(&args.file)?;
    let query = IssueCreateIssueAttachmentQuery {
        name: file_name(&args.file),
        updated_at: None,
    };
    let resp = client
        .api()
        .issue_create_issue_attachment(owner, name, index(args.number)?, &bytes, query)
        .send()?;
    print_url(&resp);
    Ok(())
}

/// # Errors
///
/// Returns an error if the input file doesn't exist or can't be
/// read. 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 browser download URL to stdout.
pub fn run_comment(client: &Client, args: CommentArgs) -> Result<()> {
    if !args.file.is_file() {
        bail!(
            "hive-forge attach-comment: file not found: {}",
            args.file.display()
        );
    }
    let (owner, name) = client.owner_repo()?;
    let bytes = read_file(&args.file)?;
    let query = IssueCreateIssueCommentAttachmentQuery {
        name: file_name(&args.file),
        updated_at: None,
    };
    let resp = client
        .api()
        .issue_create_issue_comment_attachment(owner, name, index(args.id)?, &bytes, query)
        .send()?;
    print_url(&resp);
    Ok(())
}

fn read_file(path: &Path) -> Result<Vec<u8>> {
    std::fs::read(path).with_context(|| format!("read {}", path.display()))
}

/// The upload's attachment name — the file's basename, matching what
/// the old multipart form (which sent the file with its real name)
/// made the server record.
fn file_name(path: &Path) -> Option<String> {
    path.file_name().map(|n| n.to_string_lossy().into_owned())
}

fn print_url(v: &Attachment) {
    if let Some(url) = &v.browser_download_url {
        println!("{url}");
    }
}