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

# Load .env if present
if [ -f "$(dirname "$0")/../.env" ]; then
  set -a
  # shellcheck disable=SC1091
  . "$(dirname "$0")/../.env"
  set +a
fi

API_URL=${GITEA_API_URL:-"https://gitea.elpatron.me/api/v1"}
OWNER=${GITEA_OWNER:-"elpatron"}
REPO=${GITEA_REPO:-"octo-funnel"}
TOKEN=${GITEA_API_TOKEN:-""}

TAG=""
NAME=""
ASSET_PATH=""
BODY_FILE=""

usage() {
  echo "Usage: $0 -t <tag> -a <asset-zip> [-n <name>] [-b <body-file>]" >&2
}

while getopts ":t:a:n:b:" opt; do
  case $opt in
    t) TAG="$OPTARG" ;;
    a) ASSET_PATH="$OPTARG" ;;
    n) NAME="$OPTARG" ;;
    b) BODY_FILE="$OPTARG" ;;
    *) usage; exit 2 ;;
  esac
done

if [ -z "$TAG" ] || [ -z "$ASSET_PATH" ]; then
  usage; exit 2
fi
if [ -z "$NAME" ]; then NAME="$TAG"; fi
if [ ! -f "$ASSET_PATH" ]; then
  echo "Asset not found: $ASSET_PATH" >&2; exit 1
fi
if [ -z "$TOKEN" ]; then
  echo "GITEA_API_TOKEN not set (in .env)." >&2; exit 1
fi

# Derive asset name early for later use
ASSET_NAME="$(basename "$ASSET_PATH")"

BODY="Tailscale Funnel Plugin ${TAG}\n\nAutomated release."
if [ -n "$BODY_FILE" ] && [ -f "$BODY_FILE" ]; then
  BODY=$(cat "$BODY_FILE")
fi

# Try to fetch existing release by tag first
get_resp=$(curl -sS -H "Authorization: token ${TOKEN}" "${API_URL}/repos/${OWNER}/${REPO}/releases/tags/${TAG}" || true)
rel_id=$(echo "$get_resp" | jq -r '.id // empty')

if [ -z "$rel_id" ]; then
  # Build minimal JSON payload (use existing tag)
  create_payload=$(jq -n --arg tag "$TAG" --arg name "$NAME" --arg body "$BODY" '{tag_name:$tag, name:$name, body:$body, draft:false, prerelease:false}')

  create_resp=$(curl -sS -X POST \
    -H 'Content-Type: application/json' \
    -H "Authorization: token ${TOKEN}" \
    -d "$create_payload" \
    "${API_URL}/repos/${OWNER}/${REPO}/releases" || true)

  # Extract id from create response
  rel_id=$(echo "$create_resp" | jq -r '.id // empty')
fi

# Fallback: search releases list for matching tag if still empty
if [ -z "$rel_id" ]; then
  list_resp=$(curl -sS -H "Authorization: token ${TOKEN}" "${API_URL}/repos/${OWNER}/${REPO}/releases?limit=100")
  rel_id=$(echo "$list_resp" | jq -r --arg tag "$TAG" '[.[] | select(.tag_name==$tag)][0].id // empty')
fi

if [ -z "$rel_id" ]; then
  echo "Failed to get create/fetch release id" >&2
  echo "$create_resp" | head -c 400 >&2
  exit 1
fi

# Check if asset exists (skip upload if present)
assets_json=$(curl -sS -H "Authorization: token ${TOKEN}" "${API_URL}/repos/${OWNER}/${REPO}/releases/${rel_id}/assets")
asset_exists=$(echo "$assets_json" | jq -r --arg name "$ASSET_NAME" 'any(.[]; .name==$name)')

if [ "$asset_exists" = "true" ]; then
  echo "Asset already exists, skipping upload: ${ASSET_NAME}"
else
  echo "Uploading asset: ${ASSET_NAME}"
  upload_resp=$(curl -sS -H "Authorization: token ${TOKEN}" -F attachment=@"${ASSET_PATH}" "${API_URL}/repos/${OWNER}/${REPO}/releases/${rel_id}/assets?name=${ASSET_NAME}")
  html_url=$(echo "$upload_resp" | jq -r '.browser_download_url // empty')
  echo "Asset uploaded: ${html_url}"
fi

echo "Release ${TAG} ready (id=${rel_id})."