#!/bin/bash
set -euo pipefail

# -------- Platform detection --------
detect_platform() {
  if [[ "$OSTYPE" == "darwin"* ]]; then
    OS="macos"; PKG_MGR="brew"
    if ! command -v brew &>/dev/null; then
      /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
      echo 'eval "$(/opt/homebrew/bin/brew shellenv)"' >> ~/.zprofile
      eval "$(/opt/homebrew/bin/brew shellenv)"
    fi
  elif command -v apt &>/dev/null; then
    OS="debian"; PKG_MGR="apt"
  elif command -v dnf &>/dev/null; then
    OS="rhel"; PKG_MGR="dnf"
  elif command -v yum &>/dev/null; then
    OS="rhel"; PKG_MGR="yum"
  elif command -v pacman &>/dev/null; then
    OS="arch"; PKG_MGR="pacman"
  else
    echo "Unsupported platform."; exit 1
  fi
}

# -------- Debian repo/key --------
install_gpg_if_needed() {
  if [[ "${OS}" == "debian" ]] && ! command -v gpg &>/dev/null; then
    sudo apt update && sudo apt install -y gnupg
  fi
}

add_fish_repo_debian() {
  echo 'deb http://download.opensuse.org/repositories/shells:/fish:/release:/4/Debian_12/ /' \
  | sudo tee /etc/apt/sources.list.d/fish.list >/dev/null
  curl -fsSL https://download.opensuse.org/repositories/shells:fish:release:4/Debian_12/Release.key \
    | gpg --dearmor | sudo tee /etc/apt/trusted.gpg.d/fish.gpg >/dev/null
  sudo apt update
}

# -------- Install/Update fish --------
install_fish() {
  case "$OS" in
    debian) add_fish_repo_debian; sudo apt install -y fish ;;
    rhel)   sudo "$PKG_MGR" install -y fish ;;
    arch)   sudo pacman -Sy --noconfirm fish ;;
    macos)  brew install fish ;;
  esac
}

update_fish_if_available() {
  case "$PKG_MGR" in
    apt)
      sudo apt update
      if apt list --upgradable 2>/dev/null | grep -q "^fish/"; then
        sudo apt install -y fish
      fi
      ;;
    dnf|yum)
      sudo "$PKG_MGR" check-update || true
      if "$PKG_MGR" list updates | grep -q "^fish"; then
        sudo "$PKG_MGR" update -y fish
      fi
      ;;
    pacman)
      sudo pacman -Sy --noconfirm
      if pacman -Qu | grep -q "^fish"; then
        sudo pacman -S --noconfirm fish
      fi
      ;;
    brew)
      brew update
      if brew outdated | grep -q "^fish"; then
        brew upgrade fish
      fi
      ;;
  esac
}

# -------- Fisher & plugins (stdin isolated) --------
install_fisher() {
  curl -fsSL https://git.mycod.in/apt/fish_install/raw/branch/main/install_fisher.fish \
    -o /tmp/install_fisher.fish
  chmod +x /tmp/install_fisher.fish
  fish /tmp/install_fisher.fish </dev/null
}

install_fish_plugins() {
  curl -fsSL https://git.mycod.in/apt/fish_install/raw/branch/main/fish_plugins.fish \
    -o /tmp/fish_plugins.fish
  chmod +x /tmp/fish_plugins.fish

  if [[ "${FISH_VERBOSE:-0}" == "1" ]]; then
    fish /tmp/fish_plugins.fish </dev/null
  else
    fish /tmp/fish_plugins.fish </dev/null >/dev/null 2>&1
  fi
}

# -------- Main --------
detect_platform
install_gpg_if_needed

if command -v fish &>/dev/null; then
  update_fish_if_available
else
  install_fish
fi

# Always ensure Fisher and plugins are present (idempotent)
install_fisher
install_fish_plugins

echo "✅ Fish + Fisher + plugins ensured on ${OS}."