use std::collections::HashMap;
use std::path::{Path, PathBuf};
use tiny_http::{Header, Response, StatusCode};
const SERVER_NAME: &str = "pijul-srv-lite/0.1.0";

    println!("Hello, world!");

    let port = std::env::var("PIJUL_SRV_PORT")
        .ok()
        .and_then(|p| p.parse().ok())
        .unwrap_or(8080);
    let repo_base = std::env::var("PIJUL_SRV_REPO_DIR")
        .map(PathBuf::from)
        .unwrap_or_else(|_| PathBuf::from("/vcs/pijul"));
    let repo_path = if repo_base.join(".pijul").exists() {
        repo_base
    } else {
        repo_base.join("default")
    };
    if !repo_path.join(".pijul").exists() {
        eprintln!("Repository not found at {:?}", repo_path);
        std::process::exit(1);
    }
    let server = tiny_http::Server::http(format!("0.0.0.0:{port}")).unwrap();
    println!("{SERVER_NAME} listening on port {port}");
    println!("Serving repository from {:?}", repo_path);
    for request in server.incoming_requests() {
        if request.method() == &tiny_http::Method::Head {
            let _ = request.respond(Response::empty(200));
            continue;
        }
        let response = handle_request(request.url(), &repo_path);
        let _ = request.respond(response);
    }
}
fn handle_request(url: &str, repo_path: &Path) -> Response<std::io::Cursor<Vec<u8>>> {
    let (path, query_str) = url.split_once('?').unwrap_or((url, ""));
    let path = path.trim_start_matches('/');
    if !path.starts_with(".pijul") {
        return not_found("not found");
    }
    let query: HashMap<String, String> = query_str
        .split('&')
        .filter_map(|pair| {
            if pair.is_empty() {
                return None;
            }
            let (k, v) = pair.split_once('=').unwrap_or((pair, ""));
            Some((k.to_string(), percent_decode(v)))
        })
        .collect();
    if query.is_empty() {
        return serve_info(repo_path);
    }
    if let Some(change) = query.get("change") {
        return serve_change(repo_path, change);
    }
    if query.get("changelist").map(String::as_str) == Some("0") {
        if let Some(channel) = query.get("channel") {
            return serve_changelist(repo_path, channel);
        }
    }
    if let Some(channel) = query.get("channel") {
        if query.contains_key("id") {
            return serve_channel_id(repo_path, channel);
        }
        return serve_channel(repo_path, channel);
    }
    if query.contains_key("state") {
        return serve_state(repo_path);
    }
    if query.contains_key("identities") {
        return serve_identities();
    }
    if query.contains_key("log") {
        return serve_info(repo_path);
    }
    if query.contains_key("tag") {
        return serve_tag(repo_path);
    }
    bad_request()
}
/* ---------------- protocol handlers ---------------- */
fn serve_channel_id(repo_path: &Path, _channel: &str) -> Response<std::io::Cursor<Vec<u8>>> {
    let path = repo_path.join(".pijul").join("pristine").join("db");
    serve_file(&path, "application/octet-stream")
}
fn serve_channel(repo_path: &Path, _channel: &str) -> Response<std::io::Cursor<Vec<u8>>> {
    let path = repo_path.join(".pijul").join("pristine").join("db");
    serve_file(&path, "application/octet-stream")
}
fn serve_changelist(repo_path: &Path, channel: &str) -> Response<std::io::Cursor<Vec<u8>>> {
    let path = repo_path.join("changelists").join(channel);
    serve_file(&path, "text/plain")
}
fn serve_change(repo_path: &Path, hash: &str) -> Response<std::io::Cursor<Vec<u8>>> {
    if hash.len() < 3 || !hash.chars().all(|c| c.is_ascii_alphanumeric()) {
        return not_found("invalid change hash");
    }
    let (pfx, sfx) = hash.split_at(2);
    let path = repo_path
        .join(".pijul")
        .join("changes")
        .join(pfx)
        .join(format!("{}.change", sfx));
    serve_file(&path, "application/octet-stream")
}
fn serve_state(repo_path: &Path) -> Response<std::io::Cursor<Vec<u8>>> {
    let path = repo_path.join(".pijul").join("pristine").join("db");
    serve_file(&path, "application/octet-stream")
}
fn serve_tag(repo_path: &Path) -> Response<std::io::Cursor<Vec<u8>>> {
    let path = repo_path.join(".pijul").join("pristine").join("db");
    serve_file(&path, "application/octet-stream")
}
fn serve_identities() -> Response<std::io::Cursor<Vec<u8>>> {
    ok_json(r#"{"id":[],"rev":0}"#)
}
fn serve_info(repo_path: &Path) -> Response<std::io::Cursor<Vec<u8>>> {
    let mut out = String::from("{");
    let path = repo_path.join("changelists");
    if let Ok(entries) = std::fs::read_dir(path) {
        let names: Vec<String> = entries
            .filter_map(|e| e.ok().and_then(|e| e.file_name().into_string().ok()))
            .map(|s| format!("\"{s}\""))
            .collect();
        if !names.is_empty() {
            out.push_str("\"channels\":[");
            out.push_str(&names.join(","));
            out.push_str("],");
        }
    }
    out.push_str("\"head\":null}");
    ok_json(&out)
}
/* ---------------- helpers ---------------- */
fn serve_file(path: &Path, ty: &str) -> Response<std::io::Cursor<Vec<u8>>> {
    match std::fs::read(path) {
        Ok(data) => Response::from_data(data)
            .with_status_code(StatusCode(200))
            .with_header(Header::from_bytes("Content-Type", ty).unwrap())
            .with_header(
                Header::from_bytes("Cache-Control", "public, max-age=31536000, immutable").unwrap(),
            ),
        Err(_) => not_found("not found"),
    }
}
fn percent_decode(s: &str) -> String {
    let mut result = String::new();
    let mut chars = s.chars().peekable();
    while let Some(c) = chars.next() {
        if c == '%' {
            let hex: String = chars.by_ref().take(2).collect();
            if hex.len() == 2 {
                if let Ok(byte) = u8::from_str_radix(&hex, 16) {
                    result.push(byte as char);
                    continue;
                }
            }
            result.push('%');
            result.push_str(&hex);
        } else if c == '+' {
            result.push(' ');
        } else {
            result.push(c);
        }
    }
    result
}
/* ---------------- responses ---------------- */
fn ok_bin(data: Vec<u8>) -> Response<std::io::Cursor<Vec<u8>>> {
    Response::from_data(data)
        .with_status_code(StatusCode(200))
        .with_header(Header::from_bytes("Content-Type", "application/octet-stream").unwrap())
}
fn ok_text(s: String) -> Response<std::io::Cursor<Vec<u8>>> {
    Response::from_data(s)
        .with_status_code(StatusCode(200))
        .with_header(Header::from_bytes("Content-Type", "text/plain").unwrap())
}
fn ok_json(s: &str) -> Response<std::io::Cursor<Vec<u8>>> {
    Response::from_string(s)
        .with_status_code(StatusCode(200))
        .with_header(Header::from_bytes("Content-Type", "application/json").unwrap())
}
fn bad_request() -> Response<std::io::Cursor<Vec<u8>>> {
    Response::from_string("bad request\n").with_status_code(StatusCode(400))

fn not_found(msg: &str) -> Response<std::io::Cursor<Vec<u8>>> {
    Response::from_string(format!("{msg}\n")).with_status_code(StatusCode(404))
}
fn internal_error() -> Response<std::io::Cursor<Vec<u8>>> {
    Response::from_string("internal error\n").with_status_code(StatusCode(500))
}

# pijul-srv-lite
Idea and initial code by [Toastal](https://toast.al).
## Goals
- Low resource use
- Minimal (as in LOC).
## Provenance
Toastal had an agent write a rust package.
[Tetov](https://tetov.se) was irritated by the code and rewrote it.

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WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU
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                     END OF TERMS AND CONDITIONS
           How to Apply These Terms to Your New Libraries
  If you develop a new library, and you want it to be of the greatest
possible use to the public, we recommend making it free software that
everyone can redistribute and change.  You can do so by permitting
redistribution under these terms (or, alternatively, under the terms of the
ordinary General Public License).
  To apply these terms, attach the following notices to the library.  It is
safest to attach them to the start of each source file to most effectively
convey the exclusion of warranty; and each file should have at least the
"copyright" line and a pointer to where the full notice is found.
    <one line to give the library's name and a brief idea of what it does.>
    Copyright (C) <year>  <name of author>
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
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    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.
    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
You should also get your employer (if you work as a programmer) or your
school, if any, to sign a "copyright disclaimer" for the library, if
necessary.  Here is a sample; alter the names:
  Yoyodyne, Inc., hereby disclaims all copyright interest in the
  library `Frob' (a library for tweaking knobs) written by James Random Hacker.
  <signature of Moe Ghoul>, 1 April 1990
  Moe Ghoul, President of Vice
That's all there is to it!

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