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

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

_gitops_fail() {
  local MSG="${1:-GitOps update failed}"
  echo "[ERROR] ${MSG}" >&2

  if [ -n "${GITOPS_REPO:-}" ] && [ -n "${GITOPS_SHA:-}" ] && \
     [ -n "${SOURCE_REPO:-}" ] && [ -n "${SOURCE_COMMIT:-}" ] && \
     [ -n "${GITEA_API_URL:-}" ] && [ -n "${GITEA_TOKEN:-}" ]; then
    local env repo context
    env=$(dirname "${INPUT_FILE}")
    repo=$(basename "${SOURCE_REPO}")
    context="${repo}"
    [ -n "${GIT_TAG_PREFIX:-}" ] && context="${repo}/${GIT_TAG_PREFIX}"

    local SOURCE_URL="${GITEA_API_URL}/${SOURCE_REPO}/commit/${SOURCE_COMMIT}"
    ROOT_REPO="${GITOPS_REPO}" ROOT_COMMIT="${GITOPS_SHA}" \
      GITEA_API_URL="${GITEA_API_URL}" GITEA_TOKEN="${GITEA_TOKEN}" \
      bash "${SCRIPT_DIR}/report-status.sh" failure "Install to ${env} ${VERSION}" \
      "${context}" "" "${SOURCE_URL}" 2>/dev/null || true
  fi

  exit 1
}

_gitops_validate() {
  [ -n "${INPUT_FILE:-}" ] || _gitops_fail "INPUT_FILE is required"
  [ -n "${YQ_TPL:-}" ] || _gitops_fail "YQ_TPL is required"
  [ -n "${VERSION:-}" ] || _gitops_fail "VERSION is required"
  [ -n "${SOURCE_REPO:-}" ] || _gitops_fail "SOURCE_REPO is required"
  [ -n "${SOURCE_COMMIT:-}" ] || _gitops_fail "SOURCE_COMMIT is required"
  [ -n "${GITOPS_REPO:-}" ] || _gitops_fail "GITOPS_REPO is required"
  [ -n "${GITEA_TOKEN:-}" ] || _gitops_fail "GITEA_TOKEN is required"
  [ -n "${GITEA_API_URL:-}" ] || _gitops_fail "GITEA_API_URL is required"
}

_gitops_success() {
  local env repo context
  env=$(dirname "${INPUT_FILE}")
  repo=$(basename "${SOURCE_REPO}")
  context="${repo}"
  [ -n "${GIT_TAG_PREFIX:-}" ] && context="${repo}/${GIT_TAG_PREFIX}"

  local SOURCE_URL="${GITEA_API_URL}/${SOURCE_REPO}/commit/${SOURCE_COMMIT}"

  ROOT_REPO="${GITOPS_REPO}" ROOT_COMMIT="${GITOPS_SHA}" \
    GITEA_API_URL="${GITEA_API_URL}" GITEA_TOKEN="${GITEA_TOKEN}" \
    bash "${SCRIPT_DIR}/report-status.sh" success \
    "Install to ${env} ${VERSION}" \
    "${context}" "" "${SOURCE_URL}"
}

_gitops_substitute() {
  echo "$1" | sed "s/{{VERSION}}/$2/g"
}

_gitops_update() {
  local CLONE_DIR="${GITOPS_TARGET_DIR:-$(mktemp -d)}"

  if [ -n "${GITOPS_CLONE_URL:-}" ]; then
    git clone "${GITOPS_CLONE_URL}" "${CLONE_DIR}" || _gitops_fail "Failed to clone GitOps repo"
  else
    git clone "${CLONE_URL}" "${CLONE_DIR}" || _gitops_fail "Failed to clone GitOps repo"
  fi

  cd "${CLONE_DIR}" || _gitops_fail "Failed to enter clone directory"
  yq eval -i "${YQ_EXPR}" "${INPUT_FILE}" || _gitops_fail "Failed to update ${INPUT_FILE}"
  git add "${INPUT_FILE}" || _gitops_fail "Failed to stage ${INPUT_FILE}"
  git -c user.name="gitea-ci-bot" \
      -c user.email="ci@keskikuja.site" \
      commit -m "[skip ci] gitops: update version to ${VERSION}" || _gitops_fail "Failed to commit"
  GITOPS_SHA="$(git rev-parse HEAD)"
  git push || _gitops_fail "Failed to push"

  _gitops_success
}

_gitops_validate

YQ_EXPR=$(_gitops_substitute "${YQ_TPL}" "${VERSION}")

GITEA_HOST=$(echo "${GITEA_API_URL}" | sed 's|https://||' | sed 's|http://||')
CLONE_URL="${GITOPS_CLONE_URL:-https://${GITEA_TOKEN}@${GITEA_HOST}/${GITOPS_REPO}.git}"

if [ "${BASH_SOURCE[0]}" = "${0}" ]; then
  _gitops_update
fi