use anyhow::*;
use log::LevelFilter;
use kochab::{Document, document::HeadingLevel, Request, Response};

#[tokio::main]
/// A quick demo to show off how an app can have multiple handlers on diffrent routes
///
/// We set up three different routes:
/// * `/route/long/*`
/// * `/route/*`
/// * `/*` which matches any other route
///
/// Each route generates a slightly different page, although they all use the same layout
/// through the [`generate_doc()`] method.  Each page states which route was matched, and
/// all the trailing path segments.
///
/// For example, a request to `/route/trail` would be matched by the short route
/// (`/route/*`) with the trailing path segment `["trail"]`
async fn main() -> Result<()> {

    // We set up logging so we can see what's happening.  This isn't technically required,
    // and you can use a simpler solution (like env_logger::init()) during production
    env_logger::builder()
        .filter_module("kochab", LevelFilter::Debug)
        .init();

    kochab::Server::new()                      // Create a new server
        .add_route("/", handle_base)           // Register the base route (order irrelevant)
        .add_route("/route", handle_short)     // Reigster the short route
        .add_route("/route/long", handle_long) // Register the long route
        .serve_ip("localhost:1965")            // Start the server
        .await
}

async fn handle_base(req: Request) -> Result<Response> {
    let doc = generate_doc("base", &req);
    Ok(doc.into())
}

async fn handle_short(req: Request) -> Result<Response> {
    let doc = generate_doc("short", &req);
    Ok(doc.into())
}

async fn handle_long(req: Request) -> Result<Response> {
    let doc = generate_doc("long", &req);
    Ok(doc.into())
}

fn generate_doc(route_name: &str, req: &Request) -> Document {

    // Trailing segments comes in as a Vec of segments, so we join them together for
    // display purposes
    let trailing = req.trailing_segments().join("/");

    let mut doc = Document::new();
    doc.add_heading(HeadingLevel::H1, "Routing Demo")
       .add_text(&format!("You're currently on the {} route", route_name))
       .add_text(&format!("Trailing segments: /{}", trailing))
       .add_blank_line()
       .add_text("Here's some links to try:")
       .add_link_without_label("/")
       .add_link_without_label("/route")
       .add_link_without_label("/route/long")
       .add_link_without_label("/route/not_real")
       .add_link_without_label("/rowte");
    doc
}