#!/usr/bin/env bash
set -euo pipefail

: "${API_URL:?API_URL is required}"
: "${REPO_OWNER:?REPO_OWNER is required}"
: "${REPO_NAME:?REPO_NAME is required}"
: "${CI_RUNNER_TOKEN:?CI_RUNNER_TOKEN is required}"
: "${GITHUB_SERVER_URL:?GITHUB_SERVER_URL is required}"
: "${GITHUB_REPOSITORY:?GITHUB_REPOSITORY is required}"

BRANCH="${BRANCH:-renovate/auto-deps-update}"
BASE_BRANCH="${BASE_BRANCH:-main}"
LOCKFILE="${LOCKFILE:-uv.lock}"

if git diff --quiet "$LOCKFILE"; then
  echo "No dependency updates available."
  exit 0
fi

git config user.name "CI Bot"
git config user.email "ci-bot@example.com"
git add "$LOCKFILE"
git commit -m "chore(deps): update dependencies [automated]"

git remote set-url origin "https://x-access-token:${CI_RUNNER_TOKEN}@${GITHUB_SERVER_URL#https://}/${GITHUB_REPOSITORY}.git"
git push origin "HEAD:${BRANCH}"

if curl -s "${API_URL}/repos/${REPO_OWNER}/${REPO_NAME}/pulls?state=open" \
  -H "Authorization: token ${CI_RUNNER_TOKEN}" \
  | BRANCH="$BRANCH" python3 -c '
import json
import os
import sys

branch = os.environ["BRANCH"]
prs = json.load(sys.stdin)
sys.exit(0 if any(pr.get("head", {}).get("ref") == branch for pr in prs) else 1)
'; then
  echo "Pull request already exists; branch push updates it."
  exit 0
fi

PAYLOAD=$(BRANCH="$BRANCH" BASE_BRANCH="$BASE_BRANCH" python3 -c '
import json
import os

print(
    json.dumps(
        {
            "title": "chore(deps): update dependencies",
            "body": "This PR was created automatically to update dependencies.",
            "head": os.environ["BRANCH"],
            "base": os.environ["BASE_BRANCH"],
        }
    )
)
')

curl -sf -X POST "${API_URL}/repos/${REPO_OWNER}/${REPO_NAME}/pulls" \
  -H "Authorization: token ${CI_RUNNER_TOKEN}" \
  -H "Content-Type: application/json" \
  -d "$PAYLOAD"

echo "Created pull request."