//! Commands that talk to remotes, and the reference server.

use super::format::plural;

use super::open;

use anyhow::{Context, Result};

use oxy_core::repo::Repo;

use std::path::PathBuf;

pub fn clone(url: &str, dest: Option<PathBuf>) -> Result<i32> {

    let dest = dest.unwrap_or_else(|| {

        let base = url.trim_end_matches('/').rsplit('/').next().unwrap_or("repo");

        PathBuf::from(base)

    });

    let repo = Repo::clone(url, &dest)?;

    let heads = repo.bookmark_heads()?;

    println!("Cloned into {} ({url} on {}: {})", repo.root().display(), repo.config.bookmark, plural(heads.len(), "head"));

    Ok(0)

}

pub fn remote_add(name: &str, url: &str) -> Result<i32> {

    let mut repo = open()?;

    repo.config.set(&format!("remote.{name}.url"), url)?;

    repo.save_config()?;

    println!("Added remote {name} = {url}");

    Ok(0)

}

pub fn remote_remove(name: &str) -> Result<i32> {

    let mut repo = open()?;

    repo.config.set(&format!("remote.{name}.url"), "")?;

    repo.save_config()?;

    println!("Removed remote {name}");

    Ok(0)

}

pub fn remote_list() -> Result<i32> {

    let repo = open()?;

    let view = repo.view()?;

    for (name, url) in &repo.config.remotes {

        println!("{name}\t{url}");

        if let Some(bms) = view.remotes.get(name) {

            for (bm, st) in bms {

                let heads = repo.store().get_state(st).map(|s| s.heads.len()).unwrap_or(0);

                println!("    {bm}: {}", plural(heads, "head"));

            }

        }

    }

    Ok(0)

}

fn remote_name(remote: Option<&str>) -> String {

    remote.unwrap_or("origin").to_string()

}

pub fn fetch(remote: Option<&str>) -> Result<i32> {

    let repo = open()?;

    let remote = remote_name(remote);

    let report = repo.fetch(&remote)?;

    for (name, heads, n) in &report.refs {

        println!("{remote}/{name}: {}, {}", plural(heads.len(), "head"), plural(*n, "new change"));

    }

    if report.unverified {

        eprintln!("warning: {remote} has no trust policy; nothing fetched from it was verified");

    }

    Ok(0)

}

pub fn pull(remote: Option<&str>) -> Result<i32> {

    let repo = open()?;

    let remote = remote_name(remote);

    let r = repo.pull(&remote)?;

    if !r.changed {

        println!("Already up to date.");

        return Ok(0);

    }

    println!(

        "{} now has {}{}",

        repo.config.bookmark,

        plural(r.heads.len(), "head"),

        if r.checked_out { "; working copy updated" } else { "; run `oxy checkout` to update the working copy" }

    );

    let snap = repo.snapshot("oxy pull")?;

    if snap.base_snapshot.is_conflicted() {

        println!("The result has conflicts; see oxy status.");

    }

    Ok(0)

}

pub fn push(remote: Option<&str>, force: bool) -> Result<i32> {

    let repo = open()?;

    let remote = remote_name(remote);

    let mut code = 0;

    for r in repo.push(&remote, force)? {

        if r.ok {

            println!("{remote}/{}: {}", r.name, if r.reason.is_empty() { "updated" } else { r.reason.as_str() });

        } else {

            println!("{remote}/{}: rejected: {}", r.name, r.reason);

            code = 1;

        }

    }

    Ok(code)

}

pub fn serve(root: PathBuf, bind: &str, tokens: Vec<String>, tls: Option<(PathBuf, PathBuf)>) -> Result<i32> {

    let listener = std::net::TcpListener::bind(bind).with_context(|| format!("binding {bind}"))?;

    let root = root.canonicalize()?;

    let tls = tls.map(|(cert, key)| oxy_server::TlsFiles { cert, key });

    println!(

        "Serving repositories under {} on {}://{bind}/<repo>/oxy/v1/ ({})",

        root.display(),

        if tls.is_some() { "https" } else { "http" },

        if tokens.is_empty() { "open: no push tokens configured" } else { "push requires a token" }

    );

    if tls.is_none() && !bind.starts_with("127.") && !bind.starts_with("localhost") && !bind.starts_with("[::1]") {

        eprintln!("warning: serving plain HTTP on a non-loopback address; put a TLS terminator in front or pass --tls-cert/--tls-key");

    }

    oxy_server::run_blocking(listener, oxy_server::ServerConfig { root, tokens, tls })?;

    Ok(0)

}

pub fn git_export(git_dir: &std::path::Path) -> Result<i32> {

    let repo = open()?;

    let r = repo.git_export(git_dir)?;

    println!(

        "Exported {} to {} (branch {}: {}{}); {} already exported.",

        plural(r.exported, "change"),

        git_dir.display(),

        r.branch,

        plural(r.heads, "head"),

        if r.heads > 1 { ", joined by a synthetic merge commit" } else { "" },

        r.skipped

    );

    Ok(0)

}