#!/usr/bin/env bash

set -euo pipefail

N8N_HOST="https://n8n.bjphoster.com"
WEBHOOK_ID="7c3cf611-e700-4bc0-b108-7d6be458dae6"
WEBHOOK_URL="${N8N_HOST}/webhook/${WEBHOOK_ID}"
CONFLICT_WEBHOOK_ID=""
CONFLICT_WEBHOOK_URL="${N8N_HOST}/webhook/${CONFLICT_WEBHOOK_ID}"

TEMPLATE_REPO_DIR=$(pwd)
TEMPLATE_BRANCH="main"
COMMIT_ID=$(git log HEAD --oneline | awk '{print $1}' | head -n1)
COMMIT_MESSAGE="Template updates (commit: $COMMIT_ID)"

FILES_TO_UPDATE="${FILES_TO_UPDATE:-config.yaml.example
deploy.sh
dockerfile
main.go
makefile
routes.go
templates/html/version.html
type_webserver.go
version.go
version.sh}"

FILES_TO_UPDATE=$(echo "${FILES_TO_UPDATE}" | tr '\n' ' ' | sed 's/  */ /g' | sed 's/^ *//;s/ *$//')

echo "Fetching repository list from ${WEBHOOK_URL}..."
JSON_RESPONSE=$(curl -s -f "${WEBHOOK_URL}")

echo "Parsing repository URLs..."
CLONE_URLS=$(echo "${JSON_RESPONSE}" | jq -r '.clone_url[]?')

if [ -z "${CLONE_URLS}" ]; then
  echo "Error: No clone_url found in response or array is empty"
  echo "Response: ${JSON_RESPONSE}"
  exit 0
fi

declare -a REPOS_WITH_CONFLICTS=()

while IFS= read -r clone_url; do
  if [ -z "${clone_url}" ]; then
    continue
  fi

  echo ""
  echo "Processing repository: ${clone_url}"

  repo_name=$(basename "${clone_url}" .git)

  git clone "${clone_url}" "${repo_name}"
  pushd "${repo_name}"

  TEMPLATE_REMOTE_NAME="template"
  git remote add "${TEMPLATE_REMOTE_NAME}" "${TEMPLATE_REPO_DIR}"

  git fetch "${TEMPLATE_REMOTE_NAME}" "${TEMPLATE_BRANCH}"

  current_branch=$(git rev-parse --abbrev-ref HEAD)

  if [ -n "${FILES_TO_UPDATE}" ]; then
    files_changed=false
    conflicted_files=()
    merge_base=$(git merge-base HEAD "${TEMPLATE_REMOTE_NAME}/${TEMPLATE_BRANCH}" 2>/dev/null || true)

    for file in ${FILES_TO_UPDATE}; do
      if ! git show "${TEMPLATE_REMOTE_NAME}/${TEMPLATE_BRANCH}:${file}" >/dev/null 2>&1; then
        continue
      fi

      if [ -f "${file}" ] && [ -n "${merge_base}" ] && git show "${merge_base}:${file}" >/dev/null 2>&1; then
        tmp_base=$(mktemp)
        tmp_template=$(mktemp)
        tmp_current=$(mktemp)
        git show "${merge_base}:${file}" > "${tmp_base}" 2>/dev/null
        git show "${TEMPLATE_REMOTE_NAME}/${TEMPLATE_BRANCH}:${file}" > "${tmp_template}" 2>/dev/null
        cp "${file}" "${tmp_current}"

        if git merge-file "${file}" "${tmp_base}" "${tmp_template}" 2>/dev/null; then
          git add "${file}"
          files_changed=true
        else
          echo "Conflict detected in ${repo_name}:${file}"
          conflicted_files+=("${file}")
          cp "${tmp_current}" "${file}"
          git checkout HEAD -- "${file}" >/dev/null 2>&1 || true
        fi

        rm -f "${tmp_base}" "${tmp_template}" "${tmp_current}"
      else
        if git checkout "${TEMPLATE_REMOTE_NAME}/${TEMPLATE_BRANCH}" -- "${file}" 2>/dev/null; then
          files_changed=true
        fi
      fi
    done

    if [ ${#conflicted_files[@]} -gt 0 ]; then
      REPOS_WITH_CONFLICTS+=("${repo_name}")
      repo_var="CONFLICTS_${repo_name//-/_}"
      eval "declare -g -a ${repo_var}=($(printf '"%s" ' "${conflicted_files[@]}"))"
    fi

    if [ "$files_changed" = true ] && [ ${#conflicted_files[@]} -eq 0 ]; then
      if ! git diff --cached --quiet; then
        git commit -m "${COMMIT_MESSAGE}"
        git push
      fi
    fi
  else
    if git merge "${TEMPLATE_REMOTE_NAME}/${TEMPLATE_BRANCH}" \
      --no-edit \
      --no-ff \
      --message "${COMMIT_MESSAGE}"; then
      echo "Template merge successful for ${repo_name}"
      git push
    else
      echo "Warning: Merge conflicts detected in ${repo_name}"
      popd
      rm -rf "${repo_name}"
      continue
    fi
  fi

  popd
  rm -rf "${repo_name}"
done <<< "${CLONE_URLS}"

if [ ${#REPOS_WITH_CONFLICTS[@]} -gt 0 ]; then
  conflict_json="{"
  conflict_json+="\"conflicts\":["
  for i in "${!REPOS_WITH_CONFLICTS[@]}"; do
    repo="${REPOS_WITH_CONFLICTS[$i]}"
    repo_var="CONFLICTS_${repo//-/_}"
    if [ $i -gt 0 ]; then
      conflict_json+=","
    fi
    conflict_json+="{\"repository\":\"${repo}\",\"files\":["
    declare -n files_array="${repo_var}"
    for j in "${!files_array[@]}"; do
      if [ $j -gt 0 ]; then
        conflict_json+=","
      fi
      conflict_json+="\"${files_array[$j]}\""
    done
    conflict_json+="]}"
    unset -n files_array
  done
  conflict_json+="]}"

  curl -s -X POST "${CONFLICT_WEBHOOK_URL}" \
    -H "Content-Type: application/json" \
    -d "${conflict_json}" >/dev/null 2>&1 || true
  fi

echo ""
echo "All repositories processed successfully!"