#![allow(dead_code)]
#![allow(clippy::useless_format)]
#![allow(clippy::needless_return)]
#![deny(clippy::as_conversions)]

use anyhow::Context as _;
use forgejo_api::Forgejo;

mod collect;
mod event_meta;
mod issue;
mod render;
mod tree;
mod wiki;

pub struct Context {
    /// API Accessor object
    pub forgejo: forgejo_api::Forgejo,
    /// Repository Owner
    pub owner: String,
    /// Repository Name
    pub repo: String,
    /// URL of the repository page
    pub repo_url: url::Url,
    /// URL of the repository with authentication information attached
    pub repo_auth_url: Option<url::Url>,
    /// Human readable timestamp of this manager run
    pub timestamp: String,
}

async fn run() -> anyhow::Result<()> {
    let meta = if std::env::var("TECHTREE_FAKE").ok().is_some() {
        log::warn!("Fake tree!");
        event_meta::fake()
    } else {
        event_meta::get_issue_event_meta_from_env()
            .context("Maybe you want to run with TECHTREE_FAKE=1?")
            .context("Failed reading issue event data")?
    };

    log::info!(
        "Running due to event \"{:?}\" on issue #{} ...",
        meta.action,
        meta.issue.number
    );

    let timestamp = chrono::Local::now().format("%Y-%m-%d %H:%M:%S").to_string();
    log::info!("Timestamp of this run is {timestamp}");

    let token = std::env::var("GITHUB_TOKEN").ok();
    if token.is_none() {
        log::warn!("No GITHUB_TOKEN, only performing read-only operations!");
    }

    let server_url = url::Url::parse(&std::env::var("GITHUB_SERVER_URL").unwrap_or_else(|_e| {
        log::warn!("Using FAFO URL as a default GITHUB_SERVER_URL!");
        "https://git.fa-fo.de".to_string()
    }))
    .context("Failed parsing GITHUB_SERVER_URL as a url")?;

    let repo_url = server_url
        .join(&format!(
            "{}/{}",
            meta.issue.repository.owner, meta.issue.repository.name
        ))
        .with_context(|| {
            format!("failed building repository URL from GITHUB_SERVER_URL: {server_url}")
        })?;

    let repo_auth_url = token
        .as_ref()
        .map(|token| -> Result<_, ()> {
            let mut repo_auth_url = repo_url.clone();
            repo_auth_url.set_username("forgejo-actions")?;
            repo_auth_url.set_password(Some(token))?;
            Ok(repo_auth_url)
        })
        .transpose()
        .map_err(|_e| anyhow::anyhow!("Repo URL does not have correct format"))
        .context("Failed adding auth info to repo URL")?;

    let auth = if let Some(token) = token.as_ref() {
        forgejo_api::Auth::Token(token)
    } else {
        forgejo_api::Auth::None
    };
    let forgejo =
        Forgejo::new(auth, server_url).context("Could not create Forgejo API access object")?;

    let ctx = Context {
        forgejo,
        owner: meta.issue.repository.owner.clone(),
        repo: meta.issue.repository.name.clone(),
        repo_url,
        repo_auth_url,
        timestamp,
    };

    if meta.action == event_meta::IssueAction::Opened {
        log::debug!("Running for a newly opened issue.  Taking care of the comment first...");
        match issue::find_or_make_bot_comment(&ctx, meta.issue.number).await {
            Ok((_comment, is_new)) => {
                if is_new {
                    log::info!(
                        "Waiting for a minute, as the issue is brand new.  We will likely catch some more updates this way!"
                    );
                    tokio::time::sleep(std::time::Duration::from_secs(60)).await;
                }
            }
            Err(err) => {
                log::warn!(
                    "Error while commenting on new issue #{}, continuing anyway... Error: {err:?}",
                    meta.issue.number
                );
            }
        }
    }

    log::info!("Collecting tree from issue metadata...");
    let tree = collect::collect_tree(&ctx)
        .await
        .context("Failed to collect the techtree from issue metadata")?;

    log::info!("Rendering and publishing techtree to git repository...");
    let rendered_tree = render::render(&ctx, &tree)
        .await
        .context("Failed to render the techtree")?;

    if token.is_some() {
        render::publish(&ctx, &rendered_tree)
            .await
            .context("Failed to publish rendered tree to git")?;
    } else {
        log::warn!("Skipped publishing the rendered tree.");
    }

    // Wiki is disabled because the tree is too big for mermaid to handle
    if false {
        log::info!("Updating the wiki overview...");
        wiki::update_wiki_from_tree(&ctx, &tree)
            .await
            .context("Failed to update the techtree wiki page")?;
    }

    if token.is_none() {
        log::warn!("Not running issue updates without token.");
        return Ok(());
    }

    'issues: for issue in tree.iter_issues() {
        let subtree = tree
            .subtree_for_issue(issue)
            .expect("issue from tree not found in tree");
        let hash = subtree.stable_hash();

        let (bot_comment, _is_new) = issue::find_or_make_bot_comment(&ctx, issue)
            .await
            .with_context(|| format!("Failed to find or make bot comment in issue #{issue}"))?;

        if bot_comment.body.contains(&hash) {
            log::debug!("Issue #{issue} is up to date, not editing comment.");
            issue::remove_stale_label(&ctx, issue)
                .await
                .with_context(|| format!("Failed to remove `Stale` label from issue #{issue}"))?;

            continue 'issues;
        }

        log::info!("Updating bot comment in issue #{issue} ...");
        issue::update_bot_comment_from_subtree(&ctx, bot_comment.id, &subtree, &hash)
            .await
            .with_context(|| format!("Failed to update bot comment in issue #{issue}"))?;

        issue::remove_stale_label(&ctx, issue)
            .await
            .with_context(|| format!("Failed to remove `Stale` label from issue #{issue}"))?;
    }

    Ok(())
}

#[tokio::main]
async fn main() -> anyhow::Result<()> {
    env_logger::Builder::from_env(env_logger::Env::default().default_filter_or("info")).init();
    run().await
}