#!/usr/bin/env miaou-bash

# CONSTANTS

readonly AZERTY_ZONES=(
  'Europe/Paris'
  'Indian/Reunion'
  'Indian/Mayotte'
  'America/Cayenne'
  'America/Guadeloupe'
  'America/Martinique'
  'Pacific/Noumea'
  'Pacific/Tahiti'
)
readonly REQUIRED_PKGS=(file jq vim git)
readonly BACKUP='ORIGINAL'

# FUNCTIONS

function usr_bin_miaou_bash {
  local source_bin="$MIAOU_BASH_DIR/bin/miaou-bash"
  local dest_bin="/usr/bin/miaou-bash"
  if ! [[ -f "$dest_bin" ]]; then
    cp -f "$source_bin" "$dest_bin"
    echo "/usr/bin/miaou-bash created"
  elif ! cmp -s "$source_bin" "$dest_bin"; then
    cp -f "$source_bin" "$dest_bin"
    echo "/usr/bin/miaou-bash updated"
  fi
}

function install_required_packages {
  . "$MIAOU_BASH_DIR"/tools/pkg_add "${REQUIRED_PKGS[@]}"
}

function rm_bashrc_skeleton {
  if [[ -e /etc/skel/.bashrc ]]; then
    rm /etc/skel/.bashrc
    echo "skeleton .bashrc removed!"
  fi
}

function link_etc {
  local filename="$1" subfolder="${2:-}"
  local link_name="$filename"
  [[ -v LINK_NAME ]] && link_name="$LINK_NAME"

  local source="$MIAOU_BASH_DIR/etc"
  local destination="/etc"
  [[ -n "$subfolder" ]] && source+="/${subfolder}" && destination+="/${subfolder}"
  if [[ -L "$destination/$link_name" ]]; then
    if [[ "$(readlink "$destination/$link_name")" != "$source/$filename" ]]; then
      ln -sf "$source/$filename" "$destination/$link_name"
      echo "link $source/$link_name updated"
    fi
  else
    if [[ -f "$destination/$link_name" ]]; then
      mv "$destination/$link_name" "$destination/$link_name.$BACKUP"
      echo "$destination/$link_name.$BACKUP saved!"
    fi
    ln -s "$source/$filename" "$destination/$link_name"
    echo "link $source/$link_name created"
  fi
}

function arch_vimrc {
  mkdir -p /etc/vim
  if ! grep -q '/etc/vim/vimrc.local' /etc/vimrc; then
    cat >>/etc/vimrc <<-EOF
      " Source a global configuration file if available
      if filereadable("/etc/vim/vimrc.local")
        source /etc/vim/vimrc.local
      endif
EOF
    echo "vimrc source /etc/vim/vimrc.local if any"
  fi
}

function link_config_files {
  [[ "$DISTRO_LIKE" == 'arch' ]] && arch_vimrc

  link_etc vimrc.core vim
  link_etc vimrc.miaou vim
  link_etc vimrc.rookie vim

  if in_azerty_zone 2>/dev/null; then
    link_etc vimrc.azerty vim
    LINK_NAME=vimrc.local link_etc vimrc.local.azerty vim
  else
    link_etc vimrc.local vim
  fi
  link_etc bash.bashrc
  link_etc inputrc # last command required to detect successful installation
}

function bind_inputrc {
  bind -f /etc/inputrc 2>/dev/null # arch: dismiss harmless warning
}

function in_azerty_zone {
  [[ -L /etc/localtime ]] || return 1

  local zone
  zone=$(readlink /etc/localtime)
  zone="${zone#/usr/share/zoneinfo/}" # remove prefix
  for i in "${AZERTY_ZONES[@]}"; do [[ "$zone" == "$i" ]] && return; done
  return 1
}

function fix_terminfo_ghostty {
  if ! infocmp xterm-ghostty >/dev/null 2>&1; then
    tic -x "$MIAOU_BASH_DIR"/assets/terminfo/ghostty 2>/dev/null
    echo 'terminfo ghostty succesfully compiled'
  fi
}

function ghostty_global_config {
  ! command -v ghostty >/dev/null && return

  # ghostty exists
  [[ ! -d /etc/ghostty ]] && mkdir -p /etc/ghostty
  local global_config=/etc/ghostty/config
  local asset_config="$MIAOU_BASH_DIR"/assets/ghostty/config
  local change=false
  if [[ ! -f "$global_config" ]]; then
    cp "$asset_config" "$global_config"
    echo 'ghostty global config created'
    change=true
  elif ! cmp -s "$asset_config" "$global_config"; then
    cp "$asset_config" "$global_config"
    echo 'ghostty global config replaced'
    change=true
  fi

  if [[ ! -f /etc/skell/.config/ghostty/config ]]; then
    # ghostty config skeleton for new users
    mkdir -p /etc/skel/.config/ghostty
    echo "config-file = $global_config" >/etc/skel/.config/ghostty/config
  fi

  # change ghostty configuration for any normal user UID>=1000
  mapfile -t normal_users < <(awk -F: '$3 >= 1000 && $1 != "nobody" { print $1 }' /etc/passwd)
  for user in "${normal_users[@]}"; do
    local user_home
    user_home=$(getent passwd "$user" | cut -d: -f6)
    local user_ghostty_config="$user_home"/.config/ghostty/config.ghostty

    if [[ ! -f "$user_ghostty_config" ]]; then
      sudo -u "$user" -- mkdir -p "$user_home"/.config/ghostty
      echo -e "# global config\nconfig-file = /etc/ghostty/config\n" |
        sudo -u "$user" -- tee "$user_ghostty_config" >/dev/null
      echo "new predefined ghostty config file for user: $user"
    elif ! grep -q 'config-file = /etc/ghostty/config' "$user_ghostty_config"; then
      # prepend on top
      echo -e "# global config\nconfig-file = /etc/ghostty/config\n" |
        sudo -u "$user" -- tee "$user_ghostty_config".tmp >/dev/null
      cat "$user_ghostty_config" |
        sudo -u "$user" -- tee -a "$user_ghostty_config".tmp >/dev/null
      rm "$user_ghostty_config"
      sudo -u "$user" mv "$user_ghostty_config".tmp "$user_ghostty_config"
      echo "modify pre-existant ghostty config file for user: $user"
    fi
  done
}

# MAIN

source "$MIAOU_BASH_DIR/lib/functions.bash"
assert_root
usr_bin_miaou_bash
DISTRO_LIKE=$(fetch_distro_like)
install_required_packages
rm_bashrc_skeleton
fix_terminfo_ghostty
ghostty_global_config
link_config_files
bind_inputrc