#!/usr/bin/python3
# Copyright (C) 2023 Sofus Albert Høgsbro Rose
# 
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

import os
import sys
if not all([
	sys.version_info.major == 3,
	sys.version_info.minor in [9, 10, 11, 12, 13],
]):
	sys.exit(1)

from pathlib import Path
import platform
import shutil
import subprocess
import contextlib

####################
# - Constants
####################
SCRIPT_PATH = Path(__file__).resolve().parent

CMD_DEPENDENCIES = [
	'podman',
	'git',
	'pre-commit'
]

IMAGE_NAME = "site-support"
IMAGE_VERSION = ("0", "1", "1")

REGISTRY_HOST = "git.sofus.io"
REGISTRY_USER = "python-support"
REGISTRY_PASSWORD = lambda: subprocess.check_output(
	['pass', 'services/home/git.sofus.io/container-registry-token']
).decode('ascii').strip()

####################
# - Help Text
####################
def action_help() -> None:
	print("""This script provides one-click development, CI, and deployment,
	to support the use of the project.

	Usage:
		echo -e "./run.py [OPTION] [EXTRAS]"
	
	The following commands must be available:
		podman
			=> This project is developed and run in podman containers.
			=> https://podman.io/
		git
			=> This project uses git for versioning, and collaboration.
			=> https://git-scm.com/
		pre-commit
			=> Enforces that certain checks pass at each commit.
			=> https://pre-commit.com/

	Options:
		./run.py
			=> Equivilant to run.py help.
		
		./run.py -h|h|help
			=> Shows this text.
		
	Options, Run Locally:
		./run.py app
			=> Will run the app live on port 8787.

	Options, Check:
		./run.py check
			=> Will run all checks, including static analysis and tests.
		
		./run.py analyze-quality [OPTIONS]
			=> Not yet implemented...
			=> Potentially, could run ruff on Python snippets in the book.
		
		./run.py analyze-types [OPTIONS]
			=> Not yet implemented...
			=> Potentially, could run mypy on Python snippets in the book.
		
		./run.py analyze-security
			=> Will run the static security analysis suite.
		
		./run.py analyze-format [--overwrite] [OPTIONS]
			=> Not yet implemented...
			=> Potentially, could format Python snippets in the book.
		
		./run.py test
			=> Not yet impelmented...
			=> Potentially, would test distro commands in an appropriate container.
			=> Potentially, would turn Python snippets into pytest units.
				- See https://github.com/modal-labs/pytest-markdown-docs
			=> Will run all Markdown Python snippets as tests.
		
	Options, Build & Deploy:
		./run.py build
			=> Will build a docker image, and tag it :dev.
		
	Options, Housekeeping:
		./run.py clean
			=> Not yet implemented...
			=> Will delete all data caused by this project's presence on your system.
	""")


####################
# - Utilities
####################
@contextlib.contextmanager
def cd_script_dir() -> None:
	cwd_orig = Path.cwd()
	
	os.chdir(SCRIPT_PATH)
	try:
		yield
	finally:
		os.chdir(cwd_orig)

def get_git_revision_hash(short = True) -> str:
	commit_id = subprocess.check_output(
		['git', 'rev-parse', 'HEAD']
	).decode('ascii').strip()
	
	return commit_id[:16] if short else commit_id

def cmd_exists(cmd: str) -> bool:
	"""Checks if a command exists. Supports Linux, Mac, Windows.
	"""
	return shutil.which(cmd) is not None



####################
# - Actions - Build
####################
def action_build(release = False) -> None:
	tag = get_git_revision_hash() if release else "dev"
	subprocess.run([
		"podman", "build",
		".",
		
		# :<commit_id> - Tag Commit ID
		"--tag",
		f"{IMAGE_NAME}:{tag}",
		
	])

def action_publish() -> None:
	action_build(release = True)
	
	# Login to Registry
	subprocess.run([
		"podman", "login", REGISTRY_HOST,
		"--username", REGISTRY_USER,
		"--password", REGISTRY_PASSWORD(),
	])
	
	# Tag & Publish Image @ :<commit_id>
	subprocess.run([
		"podman", "image", "push",
		f"{IMAGE_NAME}:{get_git_revision_hash()}",
		f"{REGISTRY_HOST}/{REGISTRY_USER}/{IMAGE_NAME}:{get_git_revision_hash()}",
	])
	
	# Publish Image @ :M, :M.m, :M.m.p
	for image_tag in [
		f"{IMAGE_NAME}:{'.'.join(IMAGE_VERSION)}",
		f"{IMAGE_NAME}:{'.'.join(IMAGE_VERSION[:2])}",
		f"{IMAGE_NAME}:{IMAGE_VERSION[0]}",
	]:
		# Tag Image
		subprocess.run([
			"podman", "tag",
			f"{IMAGE_NAME}:{get_git_revision_hash()}",
			image_tag
		])
	
		# Publish Image
		subprocess.run([
			"podman", "image", "push",
			image_tag,
			f"{REGISTRY_HOST}/{REGISTRY_USER}/{image_tag}",
		])


####################
# - Actions - Run
####################
def action_app() -> None:
	action_build()
	subprocess.run([
		"podman", "run", "--rm", "-it",
		"--publish", "8787:8787",
		f"{IMAGE_NAME}:dev",
	])


####################
# - Actions - Analyze
####################
def action_analyze_security() -> None:
	Path('.cache-trivy').mkdir(parents=True, exist_ok=True)
	subprocess.run([
		"podman", "run", "--rm", "-it",
		"--workdir", "/src",
		"--volume", ".:/src",
		"--volume", "./.cache-trivy:/root/.cache",
		"ghcr.io/aquasecurity/trivy:latest",
		"fs", "--quiet", "--scanners", "vuln,secret,config,license",
		"--exit-code", "1", "./"
	])




####################
# - Script
####################
if __name__ == "__main__":
	# Check Available Commands
	for cmd in CMD_DEPENDENCIES:
		if not cmd_exists(cmd) :
			print(f"{cmd} is not installed. Please see --help for instructions.")
			sys.exit(1)
	
	with cd_script_dir():
		if len(sys.argv) > 1:
			{
				"build": action_build,
				"publish": action_publish,
				
				"app": action_app,
				"dev": lambda: print("TBD"),
				
				"analyze-security": action_analyze_security,
				
				"help": action_help,
				"-h": action_help,
				"--help": action_help,
			}[sys.argv[1]]()
		else:
			action_help()