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// Back - An extremely simple git issue tracking system. Inspired by tvix's
// panettone
//
// Copyright (C) 2024 Benedikt Peetz <benedikt.peetz@b-peetz.de>
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This file is part of Back.
//
// You should have received a copy of the License along with this program.
// If not, see <https://www.gnu.org/licenses/agpl.txt>.

use crate::{
    config::BackConfig,
    error::{self, Error},
    git_bug::{
        dag::issues_from_repository,
        issue::{CollapsedIssue, Status},
    },
};
use prefix::BackPrefix;
use rocket::{
    get,
    response::content::{RawCss, RawHtml},
    State,
};

mod issue_html;
pub mod prefix;

#[get("/style.css")]
pub fn styles() -> RawCss<String> {
    RawCss(include_str!("../../assets/style.css").to_owned())
}

pub fn issue_list_boilerplate(
    config: &State<BackConfig>,
    wanted_status: Status,
    counter_status: Status,
) -> error::Result<RawHtml<String>> {
    let repository = &config.repository;

    let mut issue_list = issues_from_repository(&repository.to_thread_local())?
        .into_iter()
        .map(|issue| issue.collapse())
        .collect::<Vec<CollapsedIssue>>();

    // Sort by date descending.
    issue_list.sort_by_key(|issue| unsafe { issue.timestamp.to_unsafe() });
    issue_list.reverse();

    let issue_list_str = issue_list.into_iter().fold(String::new(), |acc, issue| {
        format!("{}{}", acc, {
            if issue.status == wanted_status {
                let issue_entry = issue.to_list_entry();
                issue_entry.0
            } else {
                String::new()
            }
        })
    });

    let counter_status_lower = counter_status.to_string().to_lowercase();
    Ok(RawHtml(format!(
        r#"
    <!DOCTYPE html>
    <html lang="en">
       <head>
          <title>Back</title>
          <link href="/style.css" rel="stylesheet" type="text/css">
          <meta content="width=device-width,initial-scale=1" name="viewport">
       </head>
       <body>
          <div class="content">
             <header>
                <h1>{wanted_status} Issues</h1>
             </header>
             <main>
                <div class="issue-links">
                   <a href="/issues/{counter_status_lower}/">View {counter_status} issues</a>
                   <a href="{}">Source code</a>
                   <!--
                   <form class="issue-search" method="get">
                       <input name="search" title="Issue search query" type="search">
                       <input class="sr-only" type="submit" value="Search Issues">
                   </form>
                   -->
                </div>
                <ol class="issue-list">
                {issue_list_str}
                </ol>
             </main>
          </div>
       </body>
    </html>
    "#,
        config.source_code_repository_url
    )))
}

#[get("/issues/open")]
pub fn open(config: &State<BackConfig>) -> error::Result<RawHtml<String>> {
    issue_list_boilerplate(config, Status::Open, Status::Closed)
}
#[get("/issues/closed")]
pub fn closed(config: &State<BackConfig>) -> error::Result<RawHtml<String>> {
    issue_list_boilerplate(config, Status::Closed, Status::Open)
}

#[get("/issue/<prefix>")]
pub fn show_issue(
    config: &State<BackConfig>,
    prefix: Result<BackPrefix, gix::hash::prefix::from_hex::Error>,
) -> error::Result<RawHtml<String>> {
    // NOTE(@bpeetz): Explicitly unwrap the `prefix` here (instead of taking the unwrapped value as
    // argument), to avoid triggering rockets "errors forward to the next route" feature.
    // This ensures, that our error message actually reaches the user. <2024-12-26>
    let prefix = prefix?;

    let repository = config.repository.to_thread_local();

    let all_issues: Vec<CollapsedIssue> = issues_from_repository(&repository)?
        .into_iter()
        .map(|val| val.collapse())
        .collect();

    let maybe_issue = all_issues
        .iter()
        .find(|issue| issue.id.to_string().starts_with(&prefix.to_string()));

    match maybe_issue {
        Some(issue) => Ok(issue.to_html(config)),
        None => Err(Error::IssuesPrefixMissing { prefix }),
    }
}