#!/usr/bin/env bash
# Refresh the deployed PR-review watcher from the repo, in one command.
#
#   ~/pr-review-watcher/update-pr-review-watcher.sh            # from master (default)
#   ~/pr-review-watcher/update-pr-review-watcher.sh some/branch  # from a branch (pre-merge testing)
#
# Pulls the latest script into a dedicated self-update checkout (~/pr-review-watcher/.src),
# separate from any work clone so it never races the issue watcher, then copies the
# watcher (and this updater) into place. NEVER touches the live config (real token).

set -euo pipefail

HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
CONFIG="$HERE/pr-review-watcher.config.json"
[ -f "$CONFIG" ] || { echo "Config not found: $CONFIG (deploy the watcher first)"; exit 1; }
REF="${1:-master}"
SRC="$HERE/.src"

cfg() { jq -r "$1" "$CONFIG"; }
URL=$(cfg .forgejoUrl); REPO=$(cfg .repo); TOKEN=$(cfg .token)
host=${URL#*://}; scheme=${URL%%://*}; owner=${REPO%%/*}
CLONE="${scheme}://${owner}:${TOKEN}@${host}/${REPO}.git"

if [ ! -d "$SRC/.git" ]; then
    echo "First run: cloning $REPO into $SRC"
    git clone -q "$CLONE" "$SRC"
fi
git -C "$SRC" remote set-url origin "$CLONE"   # keep the token fresh if it was rotated
git -C "$SRC" fetch origin -q --prune
# Prefer the remote-tracking ref; fall back to a literal ref (tag) if not a branch.
git -C "$SRC" checkout -f -q "origin/$REF" 2>/dev/null || git -C "$SRC" checkout -f -q "$REF"
git -C "$SRC" clean -fdq

cp "$SRC/automation/claude-pr-review-watcher.sh" "$HERE/"
cp "$SRC/automation/update-pr-review-watcher.sh" "$HERE/" 2>/dev/null || true  # self-update
# Seed the config from the example ONLY if missing -- never clobber the real token.
[ -f "$CONFIG" ] || cp "$SRC/automation/pr-review-watcher.config.example.json" "$CONFIG"

echo "Updated from '$REF' ($(git -C "$SRC" rev-parse --short HEAD)). Watcher script is current."
echo "Dry-run:  $HERE/claude-pr-review-watcher.sh $CONFIG"