#!/usr/bin/env bash
# Documentation: render the diagrams, and serve the pages from a throwaway nginx container.
# Usage: docs.sh serve | graphs
# Notes: docs/notes/docs.md
set -euo pipefail
cd "$(dirname "$0")"

source ./lib/config.sh
load_config

REPO="$(cd .. && pwd)"
DOCS_PORT="${DOCS_PORT:-$((HTTP_PORT + 4))}"   # +4 sits inside this env's block

serve() {
    if [ ! -f "$REPO/docs/index.html" ]; then
        echo "no docs/index.html" >&2
        exit 1
    fi
    echo "docs for '$CLUSTER' on http://localhost:${DOCS_PORT}"
    echo "  (ctrl-c to stop; nothing is installed and nothing persists)"
    docker run --rm \
        --name "${CLUSTER}-docs" \
        -p "${DOCS_PORT}:80" \
        -v "$REPO/docs:/usr/share/nginx/html:ro" \
        nginx:alpine
}

graphs() {
    if ! command -v dot >/dev/null 2>&1; then
        echo "graphviz not found — install with: sudo apt install graphviz" >&2
        echo "(only needed to re-render; the committed .svg files already work)" >&2
        exit 1
    fi
    shopt -s nullglob
    local found=0 f out
    for f in "$REPO"/docs/graphs/*.dot; do
        out="${f%.dot}.svg"
        echo "  graphviz $(basename "$f") → $(basename "$out")"
        dot -Tsvg "$f" -o "$out"
        found=1
    done
    [ "$found" -eq 1 ] || echo "  no .dot files in docs/graphs/"
}

case "${1:-serve}" in
    serve)  serve ;;
    graphs) graphs ;;
    *)      echo "usage: $0 [serve|graphs]" >&2; exit 1 ;;
esac