#!/usr/bin/env bash


    ## ## ## ## ## ## ## ## ## ## ## ## ## ##
   ##                                       ##
  ##                 ci.sh                   ##
 ##                                           ##
 ##          A poor man's continuous          ##
  ##           integration system            ##
   ##                                       ##
    ## ## ## ## ## ## ## ## ## ## ## ## ## ##


##
## Information
## (don't touch unless you are me)
##

NAME="ci.sh"
DESCRIPTION="A poor man's continuous integration system"
VERSION="0.1.1"
AUTHOR="david@socialnerds.org"
LICENSE="MIT"
WEBSITE="https://git.socialnerds.org/david/scripts"
CHANGELOG=("[2023-12-21][v0.1.1] More error handling"
           "[2023-12-20][v0.1.0] Initial version")


##
## Configuration
##

EXECUTABLE="$(basename $0)"
LIBRARIES="lib.sh"
DEPENDENCIES="whoami tr head basename dirname readlink curl git cut nohup ps cat getent"
REQUIRE_ROOT=0
[[ ! $HOME ]] && HOME=$(getent passwd "$USER" | cut -d: -f6)
SCRIPTS_DIR="$HOME/ci-scripts"
TEMP_DIR="/tmp/ci-repos"

##
## Functions
##

# Print help information
function print_help() {
  local i=20
  printf "%s\n\n%s\n%b\n\n%s\n" \
         "$DESCRIPTION" "Usage:" "$LIB_BOLD$EXECUTABLE <options> <git-repo>$LIB_CLEAR" "Options:"
  printf "  %-${i}s %b\n" \
         "-s, --scripts <DIR>" "Specify the scripts directory (default: $SCRIPTS_DIR)" \
         "-c, --checks <URL>" "Enable ${LIB_UNDERLINE}healthchecks.io${LIB_CLEAR} integration" \
         "-n, --ntfy <URL>" "Enable ${LIB_UNDERLINE}ntfy.sh${LIB_CLEAR} integration" \
         "-h, --help" "Print help screen and exit" \
         "-i, --info" "Print script information and exit" \
         "-v, --verbose" "More verbose output" \
         "-q, --quiet" "No output except errors (overrides -v)"
}


##
## Preflight
##

# Load BASH libraries
SCRIPT_PATH=$(readlink -f "$0")
SCRIPT_DIR=$(dirname "$SCRIPT_PATH")
for LIBRARY in $LIBRARIES; do
  if [[ -r "$SCRIPT_DIR/$LIBRARY" ]]; then
    #echo "Loading library file [$SCRIPT_DIR/$LIBRARY]"
    source "$SCRIPT_DIR/$LIBRARY"
  else
    echo "Error: Cannot load library file [$SCRIPT_DIR/$LIBRARY]"
    exit 1
  fi
done

# Check for root privileges
if ! lib_amiroot && [[ $REQUIRE_ROOT -eq 1 ]]; then
  lib_print "!You need to have root privileges"
  exit 1
fi

# Check for dependencies
MISSING_COMMANDS=$(lib_missing_commands $DEPENDENCIES)
if [[ -n "$MISSING_COMMANDS" ]]; then
  lib_print "!One or more commands missing [$MISSING_COMMANDS]"
  lib_print "Try installing them with your package manager"
  exit 1
fi


##
## Liftoff
##

while [[ "$1" =~ ^- && ! "$1" == "--" ]]; do
  case "$1" in
    -n|--ntfy)
      CURRENT_OPTION="$1"
      shift
      if lib_is_url "$1"; then
        NTFY_URL="$1"
      else
        lib_print "!$CURRENT_OPTION expects a valid ntfy.sh URL [$1]"
        exit 1
      fi
      ;;
    -c|--checks)
      CURRENT_OPTION="$1"
      shift
      if lib_is_url "$1"; then
        CHECKS_URL="$1"
      else
        lib_print "!$CURRENT_OPTION expects a valid healthchecks.io URL [$1]"
        exit 1
      fi
      ;;
    -s|--scripts)
      shift
      if lib_is_absolute "$1"; then
        SCRIPTS_DIR="$1"
      else
        SCRIPTS_DIR="$(PWD)/$1"
      fi
      ;;
    -h|--help)
      H=1
      ;;
    -i|--info)
      I=1
      ;;
    -v|--verbose)
      V=1
      ;;
    -q|--quiet)
      Q=1
      ;;
    *)
      lib_print "!Unknown option [$1]"
      lib_print "Try --help or -h for available options"
      exit 1
      ;;
  esac
  shift
done

if [[ "$1" == '--' ]]; then
  shift
fi

if [[ $I -eq 1 ]]; then
  lib_print_info
  exit 0
elif [[ $H -eq 1 ]]; then
  print_help
  exit 0
fi

if [[ -z "$1" ]]; then
  print_help
  exit 0
else
  # Check if a valid Git URL is provided and extract parts
  if [[ "$1" =~ ^(git@|https:\/\/)([^\/:]+)[:\/]([^\/]+)\/([^\/]+)(\.git)$ ]]; then
    GIT_URL="$1"
    GIT_HOST="${BASH_REMATCH[2]}"
    GIT_USER="${BASH_REMATCH[3]}"
    GIT_REPO="${BASH_REMATCH[4]}"
    shift
  else
    lib_print "!Input does not seem to be a valid Git URL [$1]"
    exit 1
  fi

  # Chech if the script file exists and is executable
  if [[ ! -x "$SCRIPTS_DIR/$GIT_HOST/$GIT_USER/$GIT_REPO.sh" ]]; then
    lib_print "!No CI script for this repository found [$GIT_HOST/$GIT_USER/$GIT_REPO]"
    exit 1
  fi

  # Create parent directories if missing
  if [[ ! -d "$TEMP_DIR/$GIT_HOST/$GIT_USER" ]]; then
    mkdir -p "$TEMP_DIR/$GIT_HOST/$GIT_USER"
  fi

  # Check if repo already exists and if the previous job is still running
  if [[ -d "$TEMP_DIR/$GIT_HOST/$GIT_USER/$GIT_REPO" ]]; then
    if lib_is_running $(cat "$TEMP_DIR/$GIT_HOST/$GIT_USER/$GIT_REPO.pid" 2> /dev/null); then
      lib_print "!CI job is still running [$GIT_HOST/$GIT_USER/$GIT_REPO]"
      exit 1
    else
      rm -rf "$TEMP_DIR/$GIT_HOST/$GIT_USER/$GIT_REPO"
    fi
  fi

  # Clone the repo and execute the CI script
  git clone --quiet "$GIT_URL" "$TEMP_DIR/$GIT_HOST/$GIT_USER/$GIT_REPO"
  cd "$TEMP_DIR/$GIT_HOST/$GIT_USER/$GIT_REPO"
  nohup "$SCRIPTS_DIR/$GIT_HOST/$GIT_USER/$GIT_REPO.sh" "$@" > "$TEMP_DIR/$GIT_HOST/$GIT_USER/$GIT_REPO.log" 2>&1 &
  echo $! > "$TEMP_DIR/$GIT_HOST/$GIT_USER/$GIT_REPO.pid"

  # Inform user of a successful job execution
  lib_print "CI job has been triggered [$GIT_HOST/$GIT_USER/$GIT_REPO]"
  lib_ntfy "$NTFY_URL" "CI job has been triggered [$GIT_HOST/$GIT_USER/$GIT_REPO]"
  lib_checks "$CHECKS_URL" "CI job has been triggered [$GIT_HOST/$GIT_USER/$GIT_REPO]"
fi


##
## Here be dragons
##

exit 0