#!/usr/bin/env bash
# Build the member-readable documentation site from this repository.
#
# The repository is the single source of truth. This script:
#   1. stages a mirror of the documents into .site-src/ (generated, gitignored),
#      because MkDocs cannot read the repository root directly;
#   2. renders .site-src/ to .site-build/ with MkDocs + Material.
#
# No document is moved, renamed, or rewritten — the staging copy is a build
# artifact and disappears with `--clean`.
#
# Usage:
#   publishing/build.sh                 # create/use .venv-docs and build
#   publishing/build.sh /path/to/venv   # use an existing venv
#
# In CI (Woodpecker), install the toolchain and run MkDocs directly:
#   pip install -r publishing/requirements.txt && mkdocs build --strict

set -euo pipefail

REPO_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
cd "$REPO_DIR"

VENV="${1:-$REPO_DIR/.venv-docs}"
SITE_SRC="$REPO_DIR/.site-src"

# 1. Stage the documents (Markdown at the root, maintenance/, incidents/) plus
#    the publishing assets (fonts, CSS, icon). Exclude tooling and build output.
rm -rf "$SITE_SRC"
mkdir -p "$SITE_SRC"
tar cf - \
  --exclude='.git' \
  --exclude='.site-src' \
  --exclude='.site-build' \
  --exclude='.venv-docs' \
  --exclude='*.sh' \
  --exclude='publishing/webhook-receiver.py' \
  --exclude='publishing/webhook-receiver.service' \
  --exclude='mkdocs.yml' \
  --exclude='.gitignore' \
  --exclude='requirements.txt' \
  . | tar xf - -C "$SITE_SRC"

# A file that must sit at the site root (crawler rules), not under publishing/.
cp publishing/robots.txt "$SITE_SRC/robots.txt"

# The documents sometimes link to a directory (`incidents/`) the way Gitea
# renders it. A static site has no directory listing, so generate a small
# index page for any documented subdirectory that lacks one. This is a build
# artifact — the documents themselves are never touched.
(cd "$SITE_SRC" && find . -mindepth 1 -type d ! -path './publishing*' | while read -r dir; do
  if compgen -G "$dir"/*.md >/dev/null && [ ! -f "$dir/index.md" ]; then
    dir_name="$(basename "$dir")"
    title="$(echo "$dir_name" | sed 's/-/ /g' | sed 's/^./\u&/')"
    {
      echo "# $title"
      echo
      echo "Landing page for this directory, generated by the publishing layer — the"
      echo "documents themselves live untouched in the repository."
      echo
      for f in "$dir"/*.md; do
        [ "$(basename "$f")" = "index.md" ] && continue
        heading="$(grep -m1 '^# ' "$f" | sed 's/^# //' || true)"
        echo "- [${heading:-$(basename "$f" .md)}]($(basename "$f"))"
      done
    } > "$dir/index.md"
  fi
done)

# 2. Build.
if [ ! -x "$VENV/bin/mkdocs" ]; then
  echo "Creating build venv at $VENV"
  python3 -m venv "$VENV"
  "$VENV/bin/pip" install --quiet --upgrade pip
  "$VENV/bin/pip" install --quiet -r "$REPO_DIR/publishing/requirements.txt"
fi

echo "Building site -> $REPO_DIR/.site-build"
"$VENV/bin/mkdocs" build --clean

echo "Done: $REPO_DIR/.site-build"