use reqwest::blocking::{multipart::Form, Client};
use std::{env, error::Error, fs, io, time::Duration};

fn run() -> Result<(), Box<dyn Error>> {
    let args: Vec<String> = env::args().skip(1).collect();
    let mode = args.first().map(String::as_str).unwrap_or("url");
    let input = args.get(1).map(String::as_str).unwrap_or("https://example.com/");
    let output = args.get(2).map(String::as_str).unwrap_or("output.pdf");
    if args.len() > 3 || args.len() == 1 || !matches!(mode, "url" | "file" | "text") {
        return Err("Usage: pdfcrowd-example [url|file|text INPUT [OUTPUT.pdf]]".into());
    }
    let username = env::var("API_USERNAME")?;
    let api_key = env::var("API_KEY")?;
    if username.is_empty() || api_key.is_empty() {
        return Err("API_USERNAME and API_KEY must not be empty; both may be demo.".into());
    }
    let client = Client::builder()
        .connect_timeout(Duration::from_secs(30))
        .timeout(Duration::from_secs(120))
        .redirect(reqwest::redirect::Policy::none())
        .build()?;
    let form = Form::new()
        .text("input_format", "html")
        .text("output_format", "pdf")
        .text("content_viewport_width", "balanced")
        .text("page_size", "A4");
    let form = match mode {
        "file" => form.file("file", input)?,
        _ => form.text(mode.to_owned(), input.to_owned()),
    };
    let response = client.post("https://api.pdfcrowd.com/convert/24.04/")
        .basic_auth(username, Some(api_key))
        .multipart(form)
        .send()?;
    let status = response.status();
    if status != reqwest::StatusCode::OK {
        let details = response.text()?;
        return Err(io::Error::other(format!("PDFCrowd returned HTTP {status}: {details}")).into());
    }
    let pdf = response.bytes()?;
    fs::write(output, &pdf)?;
    println!("Saved {output}");
    Ok(())
}

fn main() {
    if let Err(error) = run() {
        eprintln!("Conversion failed: {error}");
        std::process::exit(1);
    }
}