#!/bin/bash
set -e

echo "📦 Installing tectonic..."

if ! command -v tectonic &> /dev/null; then
  wget -O /tmp/tectonic.tar.gz https://github.com/tectonic-typesetting/tectonic/releases/download/tectonic%400.15.0/tectonic-0.15.0-x86_64-unknown-linux-gnu.tar.gz
  mkdir -p /tmp/tectonic
  tar -xzf /tmp/tectonic.tar.gz -C /tmp/tectonic

  # 找到可执行文件路径
  TECTONIC_BIN=$(find /tmp/tectonic -type f -name tectonic | head -n 1)

  # 默认安装路径
  INSTALL_DIR="/usr/local/bin"

  # 如果没有写入权限，就改到用户目录
  if [ ! -w "$INSTALL_DIR" ]; then
    INSTALL_DIR="$HOME/.local/bin"
    mkdir -p "$INSTALL_DIR"
    echo "⚠️  No permission for /usr/local/bin, installing to $INSTALL_DIR"
  fi

  cp "$TECTONIC_BIN" "$INSTALL_DIR/tectonic"
  chmod +x "$INSTALL_DIR/tectonic"

  # 自动提示 PATH 设置
  if [[ ":$PATH:" != *":$INSTALL_DIR:"* ]]; then
    echo "⚙️  You may need to add this to your ~/.bashrc:"
    echo "export PATH=\$PATH:$INSTALL_DIR"
  fi

  echo "✅ Tectonic installed successfully at $INSTALL_DIR/tectonic"
else
  echo "Tectonic already installed."
fi