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

archive_path="${1:-relaytv.zip}"
notes_path="${2:-RELEASE_NOTES.md}"

for variable_name in GITEA_SERVER_URL GITEA_REPOSITORY GITEA_REF_NAME GITEA_TOKEN; do
  if [[ -z "${!variable_name:-}" ]]; then
    echo "Required environment variable is not set: ${variable_name}" >&2
    exit 1
  fi
done

if [[ ! -f "$archive_path" ]]; then
  echo "Release archive does not exist: $archive_path" >&2
  exit 1
fi

if [[ ! -f "$notes_path" ]]; then
  echo "Release notes do not exist: $notes_path" >&2
  exit 1
fi

api_base="${GITEA_SERVER_URL%/}/api/v1/repos/${GITEA_REPOSITORY}/releases"
asset_name="${archive_path##*/}"
authorization_header="Authorization: token ${GITEA_TOKEN}"

release_payload="$({
  RELEASE_NOTES_PATH="$notes_path" python3 - <<'PY'
import json
import os
from pathlib import Path

tag = os.environ["GITEA_REF_NAME"]
notes = Path(os.environ["RELEASE_NOTES_PATH"]).read_text(encoding="utf-8")
print(json.dumps({
    "body": notes,
    "draft": False,
    "name": tag,
    "prerelease": False,
    "tag_name": tag,
}))
PY
})"

lookup_response="$(
  curl --silent --show-error \
    --header "$authorization_header" \
    --output - \
    --write-out $'\n%{http_code}' \
    "$api_base/tags/$GITEA_REF_NAME"
)"
lookup_status="${lookup_response##*$'\n'}"
lookup_body="${lookup_response%$'\n'*}"

case "$lookup_status" in
  200)
    release_id="$(python3 -c 'import json, sys; print(json.load(sys.stdin)["id"])' <<<"$lookup_body")"
    curl --fail-with-body --silent --show-error \
      --request PATCH \
      --header "$authorization_header" \
      --header "Content-Type: application/json" \
      --data "$release_payload" \
      "$api_base/$release_id" >/dev/null
    ;;
  404)
    release_response="$(
      curl --fail-with-body --silent --show-error \
        --request POST \
        --header "$authorization_header" \
        --header "Content-Type: application/json" \
        --data "$release_payload" \
        "$api_base"
    )"
    release_id="$(python3 -c 'import json, sys; print(json.load(sys.stdin)["id"])' <<<"$release_response")"
    ;;
  *)
    echo "Could not look up Gitea release for $GITEA_REF_NAME (HTTP $lookup_status)." >&2
    echo "$lookup_body" >&2
    exit 1
    ;;
esac

asset_id="$({
  ASSET_NAME="$asset_name" python3 -c '
import json
import os
import sys

assets = json.load(sys.stdin)
match = next((asset for asset in assets if asset["name"] == os.environ["ASSET_NAME"]), None)
print(match["id"] if match else "")
' < <(
    curl --fail-with-body --silent --show-error \
      --header "$authorization_header" \
      "$api_base/$release_id/assets"
  )
})"

if [[ -n "$asset_id" ]]; then
  curl --fail-with-body --silent --show-error \
    --request DELETE \
    --header "$authorization_header" \
    "$api_base/$release_id/assets/$asset_id" >/dev/null
fi

curl --fail-with-body --silent --show-error \
  --request POST \
  --header "$authorization_header" \
  --form "attachment=@${archive_path};filename=${asset_name}" \
  "$api_base/$release_id/assets?name=$asset_name" >/dev/null

echo "Published $asset_name to Gitea release $GITEA_REF_NAME."