#!/bin/bash
read -d '' HELP << EOF
dot - a (mostly) one script dotfiles manager

Copyright 2026 Edward Delaporte V
Licensed under AGPLv3 and later.

dot setup
	install the necessary tools to $HOME/envs/dot

dot link FILE
  updates ~/dot.HOSTNAME.yaml
  to include a symlink from ~/dotfiles/files/FILE to ~/.FILE

dot check
	check setup against ~/dot.HOSTNAME.yaml

dot apply
	apply config in ~/dot.HOSTNAME.yaml
EOF

if [ ! -n "$1" ] || [ "$1" == "help" ]; then
	echo "$HELP"
fi
# set -v

ENVS="$HOME/envs"
ANSIBLE="$ENVS/ansible/bin/ansible-playbook"
TASKFILE="$HOME/dot.$HOSTNAME.yaml"
LINKFILES="$HOME/dotfiles/files"
INSTALLS="$HOME/dotfiles/install"
DOT="$HOME/dot"

read -d '' EMPTY_TASKFILE << EOF
---
- name: Set up dotfiles on $HOSTNAME
  gather_facts: no
  hosts: localhost
  connection: local

  tasks:
    - name: Check on $TASKFILE
      ansible.builtin.stat:
        path: $TASKFILE
EOF


if [ "$1" == "setup" ]; then
  if [[ ! -f "$ANSIBLE" ]]; then
		mkdir -p "$ENVS"
		echo "Setting up Ansible in ~/envs/ansible"
	 	cd $HOME/envs; python3 -m venv ansible
		$HOME/envs/ansible/bin/pip install ansible jinja2
	fi
  if [[ -f "$ANSIBLE" ]]; then
		echo "[ ok ]: Ansible setup at $ANSIBLE"
	fi
  if [[ ! -f "$TASKFILE" ]]; then
		echo "Creating $TASKFILE"
		echo "$EMPTY_TASKFILE" >> $TASKFILE
	fi
  if [[ -f "$TASKFILE" ]]; then
		echo "[ ok ]: dot config at $TASKFILE"
	fi
fi

if [ "$1" == "reset" ]; then
	read -n1 -p "Reset $TASKFILE? [y,N]" input
	if [[ ! $input == "Y" && ! $input == "y" ]]; then
		echo "Aborted by user"
		exit 1
	fi
	echo "$EMPTY_TASKFILE" > $TASKFILE
	echo ""
fi


if [ "$1" == "check" ]; then
	$ANSIBLE $TASKFILE --check --diff
fi

if [ "$1" == "link" ]; then
	if [ ! -n "$2" ]; then
		echo "May symlink:"
		cd $LINKFILES
		ls -p | grep -v /
		exit 1
	fi

read -d '' LINK_THIS_FILE << EOF

    - name: symlink $2
      ansible.builtin.file:
        src: "$LINKFILES/$2"
        dest: "$HOME/.$2"
        state: "link"
EOF

	echo "    $LINK_THIS_FILE" >> $TASKFILE
	echo "$2 added to symlinks in $TASKFILE"
	echo "Run 'dot apply' to create all configured symlinks"
fi


if [ "$1" == "apply" ]; then
  if [[ ! -f "$TASKFILE" ]]; then
		echo "$TASKFILE is missing. Run 'dot setup'"
		exit 1
	fi
	$ANSIBLE $TASKFILE
fi

if [ "$1" == "install" ]; then
	if [ ! -n "$2" ]; then
		echo "Can install:"
		cd $INSTALLS
		ls -p | grep -v /
		exit 1
	fi
  if [[ ! -f "$INSTALLS/$2.sh" ]]; then
		echo "No such install script $INSTALLS/$2.sh"
		echo "Run dot install with no params to list scripts."
		exit 1
	fi

mkdir -p $DOT
read -d '' RUN_INSTALL << EOF
    - name: check $2
      stat:
        path: "$DOT/$2.installed"
      register: $2_installed
    - name: install $2
      ansible.builtin.shell: |
        "$INSTALLS/$2.sh"
        touch "$DOT/$2.installed"
      when: not $2_installed.stat.exists
    - name: verify $2 is installed
      ansible.builtin.debug:
        msg: "$2 is installed."
      when: $2_installed.stat.exists
EOF
	echo "    $RUN_INSTALL" >> $TASKFILE
	echo "Run 'dot apply' to run the install"
fi