#!/usr/bin/env bash
# Core functions for the docker-compose plugin

# Set strict mode
set -eo pipefail
[[ $DOKKU_TRACE ]] && set -x

# Import dokku functions
if [[ -f "/var/lib/dokku/core-plugins/available/common/functions" ]]; then
  source /var/lib/dokku/core-plugins/available/common/functions
fi

# Set default values if not already set
PLUGIN_NAME=${PLUGIN_NAME:-docker-compose}
PLUGIN_PATH=${PLUGIN_PATH:-$(cd "$(dirname "${BASH_SOURCE[0]}/..")" && pwd)}
PLUGIN_DATA_ROOT=${PLUGIN_DATA_ROOT:-"/var/lib/dokku/data/$PLUGIN_NAME"}
PLUGIN_LOG_FILE=${PLUGIN_LOG_FILE:-"$PLUGIN_DATA_ROOT/logs/plugin.log"}
PLUGIN_CONFIG_FILE=${PLUGIN_CONFIG_FILE:-"$PLUGIN_DATA_ROOT/config/config"}

# ANSI color codes
COLOR_RESET="\033[0m"
COLOR_RED="\033[0;31m"
COLOR_GREEN="\033[0;32m"
COLOR_YELLOW="\033[0;33m"
COLOR_BLUE="\033[0;34m"

# Log levels
LOG_LEVEL_DEBUG=0
LOG_LEVEL_INFO=1
LOG_LEVEL_WARN=2
LOG_LEVEL_ERROR=3
LOG_LEVEL_FATAL=4

# Default log level
LOG_LEVEL=${LOG_LEVEL:-$LOG_LEVEL_INFO}

# Set log level from environment if available
case "${DOKKU_DOCKER_COMPOSE_LOG_LEVEL}" in
  debug) LOG_LEVEL=$LOG_LEVEL_DEBUG ;;
  info)  LOG_LEVEL=$LOG_LEVEL_INFO ;;
  warn)  LOG_LEVEL=$LOG_LEVEL_WARN ;;
  error) LOG_LEVEL=$LOG_LEVEL_ERROR ;;
  fatal) LOG_LEVEL=$LOG_LEVEL_FATAL ;;
esac

# Get current timestamp
timestamp() {
  date +"%Y-%m-%d %H:%M:%S"
}

# Log a message with timestamp and log level
_log() {
  local level=$1
  local color=$2
  local level_name=$3
  shift 3
  
  if [[ $level -ge $LOG_LEVEL ]]; then
    echo -e "[$(timestamp)] [${color}${level_name}${COLOR_RESET}] $*" | tee -a "$PLUGIN_LOG_FILE" >&2
  fi
}

# Log debug message
log_debug() {
  _log $LOG_LEVEL_DEBUG "$COLOR_BLUE" "DEBUG" "$@"
}

# Log info message
log_info() {
  _log $LOG_LEVEL_INFO "$COLOR_GREEN" "INFO " "$@"
}

# Log warning message
log_warn() {
  _log $LOG_LEVEL_WARN "$COLOR_YELLOW" "WARN " "$@"
}

# Log error message
log_error() {
  _log $LOG_LEVEL_ERROR "$COLOR_RED" "ERROR" "$@"
}

# Log fatal error and exit
log_fail() {
  _log $LOG_LEVEL_FATAL "$COLOR_RED" "FATAL" "$@"
  exit 1
}

# Log success message
log_success() {
  _log $LOG_LEVEL_INFO "$COLOR_GREEN" "SUCCESS" "$@"
}

# Check if running as root
check_root() {
  if [[ $(id -u) -ne 0 ]]; then
    log_fail "This command must be run as root"
  fi
}

# Check if dokku command is available
check_dokku() {
  if ! command -v dokku >/dev/null 2>&1; then
    log_fail "Dokku is not installed or not in PATH"
  fi
}

# Load plugin configuration
load_config() {
  if [[ -f "$PLUGIN_CONFIG_FILE" ]]; then
    # shellcheck source=/dev/null
    source "$PLUGIN_CONFIG_FILE"
  fi
}

# Save plugin configuration
save_config() {
  mkdir -p "$(dirname "$PLUGIN_CONFIG_FILE")"
  local config
  config=$(declare -p | grep '^declare -x DOKKU_DOCKER_COMPOSE_' | sed 's/^declare -x //')
  echo "$config" > "$PLUGIN_CONFIG_FILE"
  chmod 600 "$PLUGIN_CONFIG_FILE"
}

# Show help
show_help() {
  cat <<EOF
Usage: dokku docker-compose:COMMAND [OPTIONS] [ARGS]...

Manage Docker Compose deployments in Dokku

Commands:
  help, --help, -h    Show this help message
  version, --version  Show version information
  import              Import a Docker Compose file
  plugin:install      Install the plugin
  plugin:uninstall    Uninstall the plugin

Import Options:
  -f, --file FILE     Specify an alternate compose file (default: docker-compose.yml)
  -p, --project NAME  Specify an alternate project name (default: directory name)
  --dry-run           Show what would be done without making any changes
  -v, --verbose       Show more detailed output
  -q, --quiet         Suppress output

Examples:
  # Import default docker-compose.yml in current directory
  dokku docker-compose:import

  # Import specific compose file
  dokku docker-compose:import -f docker-compose.prod.yml

  # Dry run to see what would be created
  dokku docker-compose:import --dry-run

  # Show version
  dokku docker-compose:version
EOF
}

# Show version information
show_version() {
  local version_file="${PLUGIN_PATH}/VERSION"
  if [[ -f "$version_file" ]]; then
    echo "dokku-docker-compose version $(cat "$version_file")"
  else
    echo "dokku-docker-compose version unknown (development)"
  fi
}

# Initialize the plugin environment
initialize_environment() {
  # Create necessary directories
  mkdir -p "$PLUGIN_DATA_ROOT/logs"
  mkdir -p "$PLUGIN_DATA_ROOT/config"
  
  # Set up log file
  touch "$PLUGIN_LOG_FILE"
  chmod 666 "$PLUGIN_LOG_FILE"
  
  # Load configuration
  load_config
  
  # Set default configuration if not set
  DOKKU_DOCKER_COMPOSE_LOG_LEVEL=${DOKKU_DOCKER_COMPOSE_LOG_LEVEL:-info}
  DOKKU_DOCKER_COMPOSE_MAX_RETRIES=${DOKKU_DOCKER_COMPOSE_MAX_RETRIES:-3}
  DOKKU_DOCKER_COMPOSE_TIMEOUT=${DOKKU_DOCKER_COMPOSE_TIMEOUT:-300}
  
  # Save configuration
  save_config
  
  log_debug "Plugin environment initialized"
}

# Clean up plugin resources
cleanup_plugin() {
  log_info "Cleaning up $PLUGIN_NAME plugin..."
  # Add cleanup logic here
  log_success "$PLUGIN_NAME plugin cleaned up successfully"
}

# Logging functions
log() {
  echo "$@" >&2
}

error() {
  log " !     $*" >&2
  exit 1
}

warn() {
  log " !     WARNING: $*" >&2
}

info() {
  [[ $QUIET ]] || log "-----> $*"
}

# Version checking
check_dokku_version() {
  local required_version="${1:-0.30.0}"
  local current_version
  current_version=$(dokku --version | head -n 1 | cut -d' ' -f3)
  
  if [[ "$(printf "%s\n%s" "$required_version" "$current_version" | sort -V | head -n1)" != "$required_version" ]]; then
    error "Dokku version $required_version or higher is required. Current version: $current_version"
  fi
}

# Argument parsing
parse_args() {
  local args=("$@")
  local i=0
  
  while [[ $i -lt ${#args[@]} ]]; do
    case "${args[$i]}" in
      -f|--file)
        ((i++))
        COMPOSE_FILE="${args[$i]}"
        ;;
      -p|--project)
        ((i++))
        PROJECT_NAME="${args[$i]}"
        ;;
      --dry-run)
        DRY_RUN=true
        ;;
      -v|--verbose)
        set -x
        ;;
      -q|--quiet)
        QUIET=true
        ;;
      *)
        # Handle non-flag arguments
        if [[ -z "$COMMAND" ]]; then
          COMMAND="${args[$i]}"
        else
          error "Unknown argument: ${args[$i]}"
        fi
        ;;
    esac
    ((i++))
  done
}

# Check if a command exists
command_exists() {
  command -v "$1" >/dev/null 2>&1
}

# Check if a file exists and is readable
file_exists() {
  [[ -r "$1" ]]
}

# Get the project directory
get_project_dir() {
  echo "${DOKKU_DOCKER_COMPOSE_PROJECT_DIR:-$(pwd)}"
}

# Get the compose file path
get_compose_file() {
  local project_dir="$(get_project_dir)"
  echo "${COMPOSE_FILE:-${project_dir}/docker-compose.yml}"
}

# Validate compose file
validate_compose_file() {
  local compose_file="$(get_compose_file)"
  
  if ! file_exists "$compose_file"; then
    error "Compose file not found: $compose_file"
  fi
  
  # Check if docker-compose or docker compose is available
  if ! command_exists docker-compose && ! command_exists docker compose; then
    error "Neither 'docker-compose' nor 'docker compose' command found"
  fi
  
  # Validate compose file syntax
  if command_exists docker-compose; then
    docker-compose -f "$compose_file" config -q || error "Invalid compose file: $compose_file"
  else
    docker compose -f "$compose_file" config -q || error "Invalid compose file: $compose_file"
  fi
}

# Main entry point
main() {
  # Ensure dokku is available
  if ! command_exists dokku; then
    error "Dokku is not installed or not in PATH"
  fi
  
  # Check dokku version
  check_dokku_version "0.30.0"
  
  # Parse arguments
  parse_args "$@"
  
  # Execute command
  case "$COMMAND" in
    help|--help|-h)
      show_help
      ;;
    version|--version|-v)
      show_version
      ;;
    import)
      validate_compose_file
      import_compose_file
      ;;
    *)
      error "Unknown command: $COMMAND"
      ;;
  esac
}

# Import compose file (stub for now)
import_compose_file() {
  local compose_file="$(get_compose_file)"
  info "Importing compose file: $compose_file"
  
  if [[ -n "$DRY_RUN" ]]; then
    info "Dry run: Would import $compose_file"
    return 0
  fi
  
  # Actual import logic will be implemented here
  info "Import functionality coming soon!"
}

# Show help
show_help() {
  cat <<EOF
Usage: dokku docker-compose:COMMAND [options]

Manage Docker Compose deployments in Dokku.

Commands:
  import [path]    Import a docker-compose.yml file
  help             Show this help message
  version          Show version information

Options:
  -f, --file FILE    Specify an alternate compose file (default: docker-compose.yml)
  -p, --project NAME Specify an alternate project name (default: directory name)
      --dry-run      Show what would be created without making changes
  -v, --verbose      Increase verbosity
  -q, --quiet        Suppress output

Examples:
  # Import default docker-compose.yml in current directory
  dokku docker-compose:import

  # Import specific compose file
  dokku docker-compose:import -f docker-compose.prod.yml

  # Dry run to see what would be created
  dokku docker-compose:import --dry-run
EOF
}

# Show version
show_version() {
  local version_file="$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/VERSION"
  local version="$(cat "$version_file" 2>/dev/null || echo 'unknown')"
  echo "dokku-docker-compose $version"
}

# Run main function if this file is executed directly
if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
  main "$@"
fi