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

fail() {
  echo "[download_from_file.sh] ERROR: $*" >&2
  exit 1
}

if [[ $# -lt 1 ]]; then
  fail "usage: $0 <playlist-file> [extra args...]"
fi

PLAYLIST_FILE="$1"
shift

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
APP_HOME="$(cd "${SCRIPT_DIR}/.." && pwd)"
CONFIG_FILE="${APP_HOME}/config/catalogsync.env"
# shellcheck source=./load_env.sh
source "${SCRIPT_DIR}/load_env.sh"

if [[ ! -f "${PLAYLIST_FILE}" ]]; then
  fail "playlist file not found: ${PLAYLIST_FILE}"
fi

require_var() {
  local var_name="$1"
  if [[ -z "${!var_name:-}" ]]; then
    fail "Missing required config variable: ${var_name} (from ${CONFIG_FILE})"
  fi
}

if [[ -f "${CONFIG_FILE}" ]]; then
  load_env_file "${CONFIG_FILE}"
else
  fail "Config file not found: ${CONFIG_FILE}. Copy catalogsync.env.example to catalogsync.env first."
fi

for required_var in LIBRARY_DIR DB_PATH INPUT_DIR LOG_DIR PYTHON_BIN VENV_DIR; do
  require_var "${required_var}"
done

if [[ -n "${VENV_DIR:-}" && -x "${VENV_DIR}/bin/python" ]]; then
  PYTHON_BIN="${VENV_DIR}/bin/python"
fi

if ! command -v "${PYTHON_BIN}" >/dev/null 2>&1; then
  fail "PYTHON_BIN is not executable or not found in PATH: ${PYTHON_BIN}"
fi

mkdir -p "${LIBRARY_DIR}" "${APP_HOME}/data" "${INPUT_DIR}" "${LOG_DIR}" "$(dirname "${DB_PATH}")"
export PYTHONPATH="${APP_HOME}/app${PYTHONPATH:+:${PYTHONPATH}}"

LOG_FILE="${LOG_DIR}/download_from_file_$(date +%Y%m%d_%H%M%S).log"
exec > >(tee -a "${LOG_FILE}") 2>&1
echo "[download_from_file.sh] logging to ${LOG_FILE}"

EXTRA_ARGS=()
if [[ -n "${DOWNLOAD_SOURCES:-}" ]]; then
  EXTRA_ARGS+=(--download-sources "${DOWNLOAD_SOURCES}")
fi

"${PYTHON_BIN}" -m musicdl.catalogsync.cli run \
  --db "${DB_PATH}" \
  --library-root "${LIBRARY_DIR}" \
  --playlist-file "${PLAYLIST_FILE}" \
  "${EXTRA_ARGS[@]}" \
  "$@"