#!/bin/bash

set -e

### Default Configuration (can be overridden by .env file)

SERVER_USER="${SERVER_USER:-$USER}"                # Default: current user
SERVER_SSH_PORT="${SERVER_SSH_PORT:-22}"           # Default: standard SSH port
SERVER_IP="${SERVER_IP:-192.168.1.100}"            # Default: common local network

SERVER_DB_DIR="${SERVER_DB_DIR:-/volume1/Darktable/darktable_db}"
SERVER_PHOTO_DIR="${SERVER_PHOTO_DIR:-/volume1/Darktable/photo_library}"

LOCAL_PHOTO_DIR="${PHOTO_DIR:-$HOME/Pictures/raw}"
LOCAL_DARKTABLE_DB_DIR="${DARKTABLE_DB_DIR:-$HOME/.config/darktable}"

BIN_DIR="${BIN_DIR:-$HOME/.local/bin}"
APPLICATIONS_DIR="$HOME/.local/share/applications"

SYNC_SCRIPT="$BIN_DIR/darktable_sync.sh"
WRAPPER_SCRIPT="$BIN_DIR/darktable_wrapper.sh"
DESKTOP_SHORTCUT="$APPLICATIONS_DIR/darktable-with-sync.desktop"
SYNC_ONLY_SHORTCUT="$APPLICATIONS_DIR/darktable-sync-only.desktop"

### Prepare folders

mkdir -p "$BIN_DIR"
mkdir -p "$HOME/.config/systemd/user"
mkdir -p "$APPLICATIONS_DIR"

### Load .env if present (overrides defaults)

ENV_FILE=".env"

if [[ -f "$ENV_FILE" ]]; then
  echo "Loading configuration from .env file..."
  set -a
  # shellcheck source=/dev/null
  . "$ENV_FILE"
  set +a
fi

### Show effective configuration

echo "Using configuration:"
echo "SERVER_USER: $SERVER_USER"
echo "SERVER_IP: $SERVER_IP"
echo "SERVER_SSH_PORT: $SERVER_SSH_PORT"
echo "SERVER_DB_DIR: $SERVER_DB_DIR"
echo "SERVER_PHOTO_DIR: $SERVER_PHOTO_DIR"
echo "PHOTO_DIR: $LOCAL_PHOTO_DIR"
echo "DARKTABLE_DB_DIR: $LOCAL_DARKTABLE_DB_DIR"
echo "BIN_DIR: $BIN_DIR"

### Check dependencies

echo "Checking requirements..."

REQUIRED_CMDS=("rsync" "notify-send" "ping" "darktable" "systemctl" "xdg-user-dir")

for cmd in "${REQUIRED_CMDS[@]}"; do
  if ! command -v "$cmd" >/dev/null 2>&1; then
    echo "Error: '$cmd' is not installed."
    echo "Install it with: sudo apt install $cmd"
    exit 1
  fi
done

# Check folder presence

if [ ! -d "$LOCAL_PHOTO_DIR" ]; then
  echo "Local photo folder does not exist: $LOCAL_PHOTO_DIR"
  echo "Create it using: mkdir -p \"$LOCAL_PHOTO_DIR\""
  exit 1
fi

if [ ! -d "$LOCAL_DARKTABLE_DB_DIR" ]; then
  echo "Darktable database path does not exist: $LOCAL_DARKTABLE_DB_DIR"
  echo "Start Darktable once or create the directory manually."
  exit 1
fi

# Check if server is reachable and remote dirs exist

if ping -c 1 "$SERVER_IP" &>/dev/null; then
  echo "Server is reachable: $SERVER_IP"

  if ! ssh -p "$SERVER_SSH_PORT" "$SERVER_USER@$SERVER_IP" "[ -d '$SERVER_DB_DIR' ]"; then
    echo "Remote directory missing on server: $SERVER_DB_DIR"
    echo "Create it or adjust the path."
    exit 1
  fi

  if ! ssh -p "$SERVER_SSH_PORT" "$SERVER_USER@$SERVER_IP" "[ -d '$SERVER_PHOTO_DIR' ]"; then
    echo "Remote directory missing on server: $SERVER_PHOTO_DIR"
    echo "Create it or adjust the path."
    exit 1
  fi
else
  echo "Server not reachable: $SERVER_IP"
  echo "Sync will fail until server is online."
fi

### Install sync and wrapper scripts

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

cp "$SCRIPT_DIR/scripts/darktable_sync.sh" "$SYNC_SCRIPT"
cp "$SCRIPT_DIR/scripts/darktable_wrapper.sh" "$WRAPPER_SCRIPT"
chmod +x "$SYNC_SCRIPT" "$WRAPPER_SCRIPT"

### Install systemd user service and timer

cp "$SCRIPT_DIR/systemd/darktable-sync.service" "$HOME/.config/systemd/user/darktable-sync.service"
cp "$SCRIPT_DIR/systemd/darktable-sync.timer" "$HOME/.config/systemd/user/darktable-sync.timer"

systemctl --user daemon-reload
systemctl --user enable darktable-sync.timer
systemctl --user start darktable-sync.timer

### Install desktop shortcuts

cp "$SCRIPT_DIR/desktop/darktable-with-sync.desktop" "$DESKTOP_SHORTCUT"
cp "$SCRIPT_DIR/desktop/darktable-sync-only.desktop" "$SYNC_ONLY_SHORTCUT"

update-desktop-database "$APPLICATIONS_DIR" 2>/dev/null || true

echo "Installation finished."