#!/usr/bin/env bash
# Download myoffice-publish.tar.gz from a Gitea release into API_DIR.
# Env:
#   GITEA_URL, GITEA_OWNER, GITEA_REPO, RELEASE_TAG (latest|v1.2.3)
#   API_DIR (default /opt/myoffice/api)
#   RELEASE_ASSET_URL  — optional direct override (skips API resolve)
#   GITEA_TOKEN        — optional for private release downloads

set -euo pipefail

API_DIR="${API_DIR:-/opt/myoffice/api}"
GITEA_URL="${GITEA_URL:-}"
GITEA_OWNER="${GITEA_OWNER:-}"
GITEA_REPO="${GITEA_REPO:-myoffice_public}"
RELEASE_TAG="${RELEASE_TAG:-latest}"
RELEASE_ASSET_URL="${RELEASE_ASSET_URL:-}"
ASSET_NAME="${ASSET_NAME:-myoffice-publish.tar.gz}"
GITEA_TOKEN="${GITEA_TOKEN:-}"

msg() { echo -e " ==> $*"; }

curl_auth() {
  if [[ -n "$GITEA_TOKEN" ]]; then
    curl -fsSL -H "Authorization: token ${GITEA_TOKEN}" "$@"
  else
    curl -fsSL "$@"
  fi
}

json_first_string() {
  # Extract first "key":"value" for key=$1 from JSON on stdin (no jq/python required).
  local key="$1"
  tr -d '\n' | sed -n "s/.*\"${key}\"[[:space:]]*:[[:space:]]*\"\([^\"]*\)\".*/\1/p" | head -1
}

resolve_asset_url() {
  if [[ -n "$RELEASE_ASSET_URL" ]]; then
    echo "$RELEASE_ASSET_URL"
    return 0
  fi

  if [[ -z "$GITEA_URL" || -z "$GITEA_OWNER" ]]; then
    echo "Set GITEA_URL + GITEA_OWNER (and GITEA_REPO), or RELEASE_ASSET_URL." >&2
    exit 1
  fi

  local base api_json tag browser_url
  base="${GITEA_URL%/}"

  if [[ "$RELEASE_TAG" == "latest" ]]; then
    api_json=$(curl_auth "${base}/api/v1/repos/${GITEA_OWNER}/${GITEA_REPO}/releases/latest")
    tag=$(printf '%s' "$api_json" | json_first_string tag_name)
    if [[ -z "$tag" ]]; then
      echo "Could not resolve latest release tag from Gitea API." >&2
      exit 1
    fi
  else
    tag="$RELEASE_TAG"
    api_json=$(curl_auth "${base}/api/v1/repos/${GITEA_OWNER}/${GITEA_REPO}/releases/tags/${tag}" || true)
  fi

  # Prefer browser_download_url that ends with the asset name
  browser_url=$(printf '%s' "${api_json:-}" | tr '"' '\n' | grep -F "/${ASSET_NAME}" | grep -E '^https?://' | head -1 || true)

  if [[ -z "$browser_url" ]]; then
    browser_url="${base}/${GITEA_OWNER}/${GITEA_REPO}/releases/download/${tag}/${ASSET_NAME}"
  fi

  echo "$browser_url"
}

download_and_extract() {
  local url tar_path staging
  url=$(resolve_asset_url)
  msg "Downloading release asset: $url"

  mkdir -p "$API_DIR"
  tar_path="/tmp/${ASSET_NAME}"
  curl_auth -o "$tar_path" "$url"

  staging=$(mktemp -d /tmp/myoffice-extract.XXXXXX)
  tar -xzf "$tar_path" -C "$staging"
  rm -f "$tar_path"

  local prod="${API_DIR}/appsettings.Production.json"
  local shared_prod="${API_DIR}/appsettings.shared.Production.json"
  local prod_bak="" shared_bak=""
  if [[ -f "$prod" ]]; then
    prod_bak=$(mktemp)
    cp -a "$prod" "$prod_bak"
  fi
  if [[ -f "$shared_prod" ]]; then
    shared_bak=$(mktemp)
    cp -a "$shared_prod" "$shared_bak"
  fi

  local top_count top_dir
  top_count=$(find "$staging" -mindepth 1 -maxdepth 1 | wc -l)
  top_dir=""
  if [[ "$top_count" -eq 1 ]]; then
    local only
    only=$(find "$staging" -mindepth 1 -maxdepth 1 | head -1)
    if [[ -d "$only" ]]; then
      top_dir="$only"
    fi
  fi

  find "$API_DIR" -mindepth 1 -maxdepth 1 \
    ! -name 'appsettings.Production.json' \
    ! -name 'appsettings.shared.Production.json' \
    -exec rm -rf {} +

  if [[ -n "$top_dir" ]]; then
    cp -a "$top_dir"/. "$API_DIR"/
  else
    cp -a "$staging"/. "$API_DIR"/
  fi
  rm -rf "$staging"

  rm -f "$API_DIR/appsettings.Production.json" "$API_DIR/appsettings.shared.Production.json" 2>/dev/null || true
  if [[ -n "$prod_bak" ]]; then
    mv "$prod_bak" "$prod"
  fi
  if [[ -n "$shared_bak" ]]; then
    mv "$shared_bak" "$shared_prod"
  fi

  if [[ ! -f "${API_DIR}/MyOffice.Web.dll" ]]; then
    echo "Extracted archive but MyOffice.Web.dll is missing in ${API_DIR}" >&2
    exit 1
  fi
  msg "App extracted to ${API_DIR}"
}

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