#!/bin/bash

# 02-dev-tools-setup.sh
# Installs various development tools and utilities.
# Supports NixOS (declarative via flake), Fedora, and Debian/Ubuntu.
# Relies on DISTRO and PACKAGE_MANAGER being set by the caller.

echo "--- Starting Development Tools Setup ---"

if [ -z "$DISTRO" ] || [ -z "$PACKAGE_MANAGER" ]; then
    echo "ERROR: DISTRO and PACKAGE_MANAGER must be set in the environment."
    exit 1
fi

# ── NixOS path ─────────────────────────────────────────────
if [ "$DISTRO" == "nixos" ]; then
    echo "NixOS detected: development tools are managed declaratively"
    echo "via nixos/flake.nix and nixos/home.nix."
    echo ""
    echo "The following packages are already configured in the flake:"
    echo "  - Go           (go, gopls, delve)"
    echo "  - Ruby on Rails (ruby, bundler, rails, rbenv, nodejs)"
    echo "  - Python        (python3, pip, virtualenv)"
    echo "  - Neovim        (latest)"
    echo "  - Cloud/DevOps  (kubectl, k9s, terraform, helm, awscli2)"
    echo "  - Other tools   (oh-my-posh, fzf, bat, eza, ripgrep, fd)"
    echo ""
    echo "Run the main-setup.sh NixOS workflow or apply manually:"
    echo ""
    echo "  sudo nixos-rebuild switch --flake ~/dotfiles/nixos#nixos"
    echo "  home-manager switch --flake ~/dotfiles/nixos#blake"
    echo ""
    echo "Skipping imperative dev tools setup."
    echo "--- Development Tools Setup Finished ---"
    exit 0
fi

# ═══════════════════════════════════════════════════════════
#  TRADITIONAL DISTRO PATH (Fedora / Ubuntu / Debian / Pop)
# ═══════════════════════════════════════════════════════════

# Setup NVIM
echo "Setting up Neovim..."
_nvim_asset_name() {
    case "$(uname -m)" in
        x86_64)  echo "nvim-linux-x86_64" ;;
        aarch64) echo "nvim-linux-arm64" ;;
        *) echo "Unsupported arch for Neovim: $(uname -m)" >&2; exit 1 ;;
    esac
}

NVIM_LATEST="$(curl -fsSL https://api.github.com/repos/neovim/neovim/releases/latest | grep '"tag_name"' | cut -d'"' -f4)"
NVIM_INSTALLED="$(nvim --version 2>/dev/null | head -n1 | awk '{print $2}')"

if [ "$NVIM_INSTALLED" = "$NVIM_LATEST" ]; then
    echo "Neovim ${NVIM_LATEST} already up-to-date."
else
    NVIM_ASSET="$(_nvim_asset_name)"
    echo "Installing Neovim ${NVIM_LATEST} (${NVIM_ASSET})..."
    TEMP_NVIM_DIR=$(mktemp -d)
    curl -fsSLo "${TEMP_NVIM_DIR}/${NVIM_ASSET}.tar.gz" \
        "https://github.com/neovim/neovim/releases/latest/download/${NVIM_ASSET}.tar.gz"
    sudo rm -rf /opt/nvim
    sudo tar -C /opt -xzf "${TEMP_NVIM_DIR}/${NVIM_ASSET}.tar.gz"
    sudo mv "/opt/${NVIM_ASSET}" /opt/nvim 2>/dev/null || true
    rm -rf "${TEMP_NVIM_DIR}"
    sudo ln -sf /opt/nvim/bin/nvim /usr/local/bin/nvim
    echo "Neovim ${NVIM_LATEST} installed to /opt/nvim, symlinked to /usr/local/bin/nvim"
fi

# pynvim
echo "Installing pynvim for Neovim Python support..."
if /usr/bin/python3 -m pip show pynvim &>/dev/null; then
    echo "pynvim already installed."
else
    /usr/bin/python3 -m pip install --user pynvim
    echo "pynvim installed for the current user."
fi

# Install Nerd Font (Hack)
echo "Installing Hack Nerd Font..."
NERDFONT_VERSION="v3.2.1" # Or use "latest" if API allows, else check manually
NERDFONT_NAME="Hack"
FONT_DIR="$HOME/.local/share/fonts"
mkdir -p "$FONT_DIR"

# Check if a Hack Nerd Font is already installed to avoid re-downloading
if fc-list | grep -qi "Hack Nerd Font"; then
    echo "Hack Nerd Font already installed."
else
    echo "Downloading and installing Hack Nerd Font..."
    TEMP_FONT_DIR=$(mktemp -d)
    wget -qO "${TEMP_FONT_DIR}/${NERDFONT_NAME}.zip" "https://github.com/ryanoasis/nerd-fonts/releases/download/${NERDFONT_VERSION}/${NERDFONT_NAME}.zip"
    if [ $? -eq 0 ]; then
        unzip -q "${TEMP_FONT_DIR}/${NERDFONT_NAME}.zip" -d "${TEMP_FONT_DIR}/${NERDFONT_NAME}NerdFont"
        # Copy only .ttf or .otf files
        find "${TEMP_FONT_DIR}/${NERDFONT_NAME}NerdFont" \( -name "*.ttf" -o -name "*.otf" \) -exec cp {} "$FONT_DIR/" \;
        echo "Updating font cache..."
        fc-cache -f -v
        echo "Hack Nerd Font installed."
    else
        echo "ERROR: Failed to download Hack Nerd Font."
    fi
    rm -rf "${TEMP_FONT_DIR}" # Clean up
fi

OS="$(uname | tr '[:upper:]' '[:lower:]')"
ARCH_RAW="$(uname -m)"
case "${ARCH_RAW}" in
	x86_64) ARCH=amd64 ;;
	aarch64|arm64) ARCH=arm64 ;;
	*) echo "Unsupported arch: ${ARCH_RAW}" >&2; exit 1 ;;
esac

_add_to_rc() {
  local rcfile="$1" snippet="$2"
  grep -qxF "${snippet}" "${rcfile}" 2>/dev/null || {
    echo "# added by 02-dev-tools-setup.sh" >> "${rcfile}"
    echo "${snippet}" >> "${rcfile}"
    echo "  → updated ${rcfile}"
  }
}

if ! command -v go &>/dev/null; then
  echo "➤ Fetching latest Go version..."
  LATEST_GO_FULL="$(curl -fsSL https://go.dev/VERSION?m=text)"  
  # e.g. "go1.21.4"
  LATEST_GO="${LATEST_GO_FULL#go}"                    
  TAR="go${LATEST_GO}.${OS}-${ARCH}.tar.gz"          
  URL="https://go.dev/dl/${TAR}"

  echo "   latest is ${LATEST_GO_FULL}, downloading ${TAR}..."
  TMPDIR="$(mktemp -d)"
  curl -fsSL "${URL}" -o "${TMPDIR}/${TAR}"
  sudo rm -rf /usr/local/go
  sudo tar -C /usr/local -xzf "${TMPDIR}/${TAR}"
  rm -rf "${TMPDIR}"
  echo "Installed Go ${LATEST_GO_FULL} to /usr/local/go"

  # ensure PATH in your RCs
  SNIPPET='export PATH=$PATH:/usr/local/go/bin'
  for rc in "${HOME}/.bashrc" "${HOME}/.zshrc"; do
    [ -f "${rc}" ] && _add_to_rc "${rc}" "${SNIPPET}"
  done
else
  INSTALLED_FULL="$(go version | awk '{print $3}')" # e.g. "go1.21.4"
  LATEST_GO_FULL="$(curl -fsSL https://go.dev/VERSION?m=text)"
  if [ "${INSTALLED_FULL}" = "${LATEST_GO_FULL}" ]; then
    echo "Go ${INSTALLED_FULL} already up-to-date"
  else
    echo "Go ${INSTALLED_FULL} installed but ${LATEST_GO_FULL} is available."
    echo "    rerun this script to upgrade or uninstall manually."
  fi
fi

echo

if ! command -v oh-my-posh &>/dev/null; then
  echo "➤ Installing Oh-My-Posh latest release..."
  # GitHub /releases/latest/download will 302 redirect to actual asset
  BIN_URL="https://github.com/JanDeDobbeleer/oh-my-posh/releases/latest/download/posh-${OS}-${ARCH}"

  mkdir -p "${HOME}/.local/bin"
  TMPBIN="$(mktemp)"
  curl -fsSL -L "${BIN_URL}" -o "${TMPBIN}"
  install -m755 "${TMPBIN}" "${HOME}/.local/bin/oh-my-posh"
  rm -f "${TMPBIN}"
  echo "Installed oh-my-posh to ~/.local/bin/oh-my-posh"

  echo "Theme is managed via dotfiles repo at terminal/posh-theme.omp.json"
  echo "Run 04-config-symlinks.sh to link it to ~/.config/oh-my-posh/theme.omp.json"

else
  echo "✔ Oh-My-Posh already installed: $(oh-my-posh --version | head -n1)"
fi

# ── Ruby on Rails ──────────────────────────────────────────
echo ""
echo "--- Setting up Ruby on Rails ---"

if ! command -v ruby &>/dev/null; then
  echo "➤ Installing Ruby via rbenv..."

  # Install rbenv
  if [ ! -d "$HOME/.rbenv" ]; then
    git clone https://github.com/rbenv/rbenv.git "$HOME/.rbenv"
    git clone https://github.com/rbenv/ruby-build.git "$HOME/.rbenv/plugins/ruby-build"
    echo 'export PATH="$PATH:$HOME/.rbenv/bin"' >> "$HOME/.bashrc"
    echo 'export PATH="$PATH:$HOME/.rbenv/bin"' >> "$HOME/.zshrc"
    echo 'eval "$(rbenv init -)"' >> "$HOME/.bashrc"
    echo 'eval "$(rbenv init -)"' >> "$HOME/.zshrc"
    echo "rbenv installed. A new shell is needed or run:"
    echo "  export PATH=\"\$PATH:\$HOME/.rbenv/bin\" && eval \"\$(rbenv init -)\""
  else
    echo "rbenv already installed."
  fi

  # Install Ruby latest stable via rbenv
  export PATH="$PATH:$HOME/.rbenv/bin"
  eval "$(rbenv init - bash 2>/dev/null || true)"

  if command -v rbenv &>/dev/null; then
    RUBY_LATEST=$(rbenv install -l 2>/dev/null | grep -v - | tail -1)
    if [ -n "$RUBY_LATEST" ]; then
      echo "➤ Installing Ruby ${RUBY_LATEST} (this may take a while)..."
      rbenv install "$RUBY_LATEST"
      rbenv global "$RUBY_LATEST"
      echo "Ruby ${RUBY_LATEST} installed and set as global version."
    fi
  fi
else
  echo "✔ Ruby already installed: $(ruby --version 2>/dev/null | head -n1)"
fi

# Install Bundler
if command -v gem &>/dev/null; then
  if ! command -v bundler &>/dev/null; then
    echo "➤ Installing Bundler..."
    gem install bundler
    echo "Bundler installed."
  else
    echo "✔ Bundler already installed."
  fi

  # Install Rails
  if ! command -v rails &>/dev/null; then
    echo "➤ Installing Rails..."
    gem install rails
    rbenv rehash 2>/dev/null || true
    echo "Rails installed."
  else
    echo "✔ Rails already installed: $(rails --version 2>/dev/null | head -n1)"
  fi
fi

echo "--- Development Tools Setup Finished ---"

# ── Helm (Kubernetes package manager) ──────────────────────
echo ""
echo "--- Installing Helm ---"
if command -v helm &>/dev/null; then
    echo "✔ Helm already installed: $(helm version --short 2>/dev/null | head -n1)"
else
    echo "➤ Fetching latest Helm version..."
    HELM_LATEST="$(curl -fsSL https://api.github.com/repos/helm/helm/releases/latest | grep '"tag_name"' | cut -d'"' -f4)"
    # e.g. "v3.16.0"
    echo "   latest is ${HELM_LATEST}, downloading..."
    TMPDIR="$(mktemp -d)"
    curl -fsSL "https://get.helm.sh/helm-${HELM_LATEST}-linux-${ARCH}.tar.gz" -o "${TMPDIR}/helm.tar.gz"
    tar -C "${TMPDIR}" -xzf "${TMPDIR}/helm.tar.gz"
    sudo install -m755 "${TMPDIR}/linux-${ARCH}/helm" /usr/local/bin/helm
    rm -rf "${TMPDIR}"
    echo "Installed Helm ${HELM_LATEST} to /usr/local/bin/helm"
fi

# --- kubectx + kubens (fast k8s context/namespace switching) ---
echo ""
echo "--- Installing kubectx & kubens ---"
_install_kubectx_kubens() {
    KUBECTX_VERSION="v0.9.5"
    echo "   version: ${KUBECTX_VERSION}"
    TMPDIR="$(mktemp -d)"
    curl -fsSL "https://raw.githubusercontent.com/ahmetb/kubectx/${KUBECTX_VERSION}/kubectx" \
        -o "${TMPDIR}/kubectx"
    curl -fsSL "https://raw.githubusercontent.com/ahmetb/kubectx/${KUBECTX_VERSION}/kubens" \
        -o "${TMPDIR}/kubens"
    sudo install -m755 "${TMPDIR}/kubectx" /usr/local/bin/kubectx
    sudo install -m755 "${TMPDIR}/kubens" /usr/local/bin/kubens
    rm -rf "${TMPDIR}"
    echo "✔ kubectx & kubens installed to /usr/local/bin/"
}
if command -v kubectx &>/dev/null && command -v kubens &>/dev/null; then
    echo "✔ kubectx & kubens already installed"
else
    _install_kubectx_kubens
fi

# --- stern (multi-pod/container log tailing for k8s) ---
echo ""
echo "--- Installing stern ---"
_stern_version() {
    curl -fsSL "https://api.github.com/repos/stern/stern/releases/latest" \
        | grep '"tag_name"' | cut -d'"' -f4
}
if command -v stern &>/dev/null; then
    echo "✔ stern already installed"
else
    STERN_VER="$(_stern_version)"
    echo "   latest is ${STERN_VER}, downloading..."
    TMPDIR="$(mktemp -d)"
    STERN_URL="https://github.com/stern/stern/releases/download/${STERN_VER}/stern_${STERN_VER#v}_linux_${ARCH}.tar.gz"
    curl -fsSL "${STERN_URL}" -o "${TMPDIR}/stern.tar.gz"
    tar -C "${TMPDIR}" -xzf "${TMPDIR}/stern.tar.gz" stern
    sudo install -m755 "${TMPDIR}/stern" /usr/local/bin/stern
    rm -rf "${TMPDIR}"
    echo "✔ stern ${STERN_VER} installed to /usr/local/bin/stern"
fi

# --- dive (Docker image layer explorer) ---
echo ""
echo "--- Installing dive ---"
_dive_version() {
    curl -fsSL "https://api.github.com/repos/wagoodman/dive/releases/latest" \
        | grep '"tag_name"' | cut -d'"' -f4
}
if command -v dive &>/dev/null; then
    echo "✔ dive already installed"
else
    DIVE_VER="$(_dive_version)"
    echo "   latest is ${DIVE_VER}, downloading..."
    DIVE_URL="https://github.com/wagoodman/dive/releases/download/${DIVE_VER}/dive_${DIVE_VER#v}_linux_${ARCH}.deb"
    TMPDIR="$(mktemp -d)"
    curl -fsSL "${DIVE_URL}" -o "${TMPDIR}/dive.deb"
    if [ "${PACKAGE_MANAGER}" = "apt" ]; then
        sudo dpkg -i "${TMPDIR}/dive.deb" 2>/dev/null || sudo apt-get install -f -y
    else
        # For rpm-based distros, extract binary from deb
        ar x "${TMPDIR}/dive.deb" data.tar.gz 2>/dev/null \
            && tar -C "${TMPDIR}" -xzf data.tar.gz ./usr/local/bin/dive \
            && sudo install -m755 "${TMPDIR}/usr/local/bin/dive" /usr/local/bin/dive \
            || echo "⚠  Could not install dive from .deb on non-apt system. Try manual install."
    fi
    rm -rf "${TMPDIR}"
    echo "✔ dive ${DIVE_VER} installed"
fi

# --- trivy (container/filesystem vulnerability scanner) ---
echo ""
echo "--- Installing trivy ---"
if command -v trivy &>/dev/null; then
    echo "✔ trivy already installed: $(trivy --version 2>/dev/null | head -n1)"
else
    echo "➤ Downloading trivy via official install script..."
    curl -sfL https://raw.githubusercontent.com/aquasecurity/trivy/main/contrib/install.sh \
        | sudo sh -s -- -b /usr/local/bin
    echo "✔ trivy installed to /usr/local/bin/trivy"
fi

# --- AWS CLI v2 ---
echo ""
echo "--- Installing AWS CLI v2 ---"
_awscli_install() {
    TMPDIR="$(mktemp -d)"
    curl -fsSL "https://awscli.amazonaws.com/awscli-exe-linux-${ARCH_RAW}.zip" \
        -o "${TMPDIR}/awscliv2.zip"
    unzip -q "${TMPDIR}/awscliv2.zip" -d "${TMPDIR}"
    sudo "${TMPDIR}/aws/install" --update
    rm -rf "${TMPDIR}"
    echo "✔ AWS CLI v2 installed"
}
if command -v aws &>/dev/null; then
    echo "✔ AWS CLI already installed: $(aws --version 2>&1)"
else
    _awscli_install
fi