#!/usr/bin/env bash
# sync-theme.sh — pull a theme from the web_themes repo into this consumer.
#
# Usage:
#   bash scripts/sync-theme.sh [theme-name]
#
# Environment overrides:
#   WEB_THEMES_REPO   git URL of the web_themes repo.
#                     Default: git@tangled.org:psingletary.com/web_themes
#                     (SSH — requires a Tangled key at build time). For CI or
#                     machines without a key, use the HTTPS form:
#                     WEB_THEMES_REPO=https://tangled.org/psingletary.com/web_themes
#   THEME_DEST        destination dir relative to repo root (default: src/styles/theme)
#   THEME_CONTRACT    0 to skip the post-sync contract check (default: 1)
#
# Strategy (build-time pull): shallow-clone the themes repo into a per-user
# cache (~/.cache/web_themes), then copy the requested theme's files into the
# consumer's src tree. After copying, the theme contract is enforced (every
# var() token in the consumer's CSS must resolve) so a breaking theme change
# fails the consumer build at the commit that broke it. Consumers wire this
# as a prebuild step:
#
#   "build": "npm run sync:theme && react-scripts build"
#
# Requires SSH access to Tangled at build time (Apple Keychain on this Mac)
# unless WEB_THEMES_REPO is overridden to HTTPS.

set -euo pipefail

THEME_NAME="${1:-witchsky-cyan}"
REPO="${WEB_THEMES_REPO:-git@tangled.org:psingletary.com/web_themes}"
DEST="${THEME_DEST:-src/styles/theme}"
CACHE_DIR="${HOME}/.cache/web_themes"

if [ -d "${CACHE_DIR}/.git" ]; then
  # Cache must track the requested repo even if it was cloned from
  # a different URL before (e.g. a local path during testing).
  if [ "$(git -C "${CACHE_DIR}" config --get remote.origin.url)" != "${REPO}" ]; then
    git -C "${CACHE_DIR}" remote set-url origin "${REPO}"
  fi
  git -C "${CACHE_DIR}" fetch --quiet --depth 1 origin main
  git -C "${CACHE_DIR}" reset --quiet --hard origin/main
else
  git clone --quiet --depth 1 --branch main "${REPO}" "${CACHE_DIR}"
fi

mkdir -p "${DEST}"
cp "${CACHE_DIR}/themes/${THEME_NAME}/theme.css" "${DEST}/theme.css"
cp "${CACHE_DIR}/themes/${THEME_NAME}/index.css" "${DEST}/index.css"
echo "synced web_themes/${THEME_NAME} -> ${DEST}/"

# Contract check: fail the build if the consumer's CSS uses a token the
# theme (or the consumer's own CSS) does not define. Skip with THEME_CONTRACT=0.
if [ "${THEME_CONTRACT:-1}" = "1" ]; then
  HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
  ROOT="$(cd "${HERE}/.." && pwd)"
  if [ -x "${HERE}/theme-contract.sh" ]; then
    bash "${HERE}/theme-contract.sh" --consumer "${ROOT}/src" "${ROOT}/${DEST}/theme.css"
  else
    echo "sync-theme: theme-contract.sh not found next to sync-theme.sh — copy both scripts from web_themes" >&2
    exit 1
  fi
fi