# Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
# License: MIT. See LICENSE

import json
import os
import sys
from collections import OrderedDict
from typing import List, Dict

import frappe
from frappe.defaults import _clear_cache


def _new_site(
	db_name,
	site,
	mariadb_root_username=None,
	mariadb_root_password=None,
	admin_password=None,
	verbose=False,
	install_apps=None,
	source_sql=None,
	force=False,
	no_mariadb_socket=False,
	reinstall=False,
	db_password=None,
	db_type=None,
	db_host=None,
	db_port=None,
	new_site=False,
):
	"""Install a new Frappe site"""

	from frappe.commands.scheduler import _is_scheduler_enabled
	from frappe.utils import get_site_path, scheduler, touch_file


	if not force and os.path.exists(site):
		print("Site {0} already exists".format(site))
		sys.exit(1)

	if no_mariadb_socket and not db_type == "mariadb":
		print("--no-mariadb-socket requires db_type to be set to mariadb.")
		sys.exit(1)

	frappe.init(site=site)

	if not db_name:
		import hashlib
		db_name = "_" + hashlib.sha1(os.path.realpath(frappe.get_site_path()).encode()).hexdigest()[:16]

	try:
		# enable scheduler post install?
		enable_scheduler = _is_scheduler_enabled()
	except Exception:
		enable_scheduler = False

	make_site_dirs()

	installing = touch_file(get_site_path("locks", "installing.lock"))

	install_db(
		root_login=mariadb_root_username,
		root_password=mariadb_root_password,
		db_name=db_name,
		admin_password=admin_password,
		verbose=verbose,
		source_sql=source_sql,
		force=force,
		reinstall=reinstall,
		db_password=db_password,
		db_type=db_type,
		db_host=db_host,
		db_port=db_port,
		no_mariadb_socket=no_mariadb_socket,
	)
	apps_to_install = (
		["frappe"] + (frappe.conf.get("install_apps") or []) + (list(install_apps) or [])
	)

	for app in apps_to_install:
		install_app(app, verbose=verbose, set_as_patched=not source_sql)

	os.remove(installing)

	scheduler.toggle_scheduler(enable_scheduler)
	frappe.db.commit()

	scheduler_status = (
		"disabled" if frappe.utils.scheduler.is_scheduler_disabled() else "enabled"
	)
	print("*** Scheduler is", scheduler_status, "***")


def install_db(root_login="root", root_password=None, db_name=None, source_sql=None,
			   admin_password=None, verbose=True, force=0, site_config=None, reinstall=False,
			   db_password=None, db_type=None, db_host=None, db_port=None, no_mariadb_socket=False):
	import frappe.database
	from frappe.database import setup_database

	if not db_type:
		db_type = frappe.conf.db_type or 'mariadb'

	make_conf(db_name, site_config=site_config, db_password=db_password, db_type=db_type, db_host=db_host, db_port=db_port)
	frappe.flags.in_install_db = True

	frappe.flags.root_login = root_login
	frappe.flags.root_password = root_password
	setup_database(force, source_sql, verbose, no_mariadb_socket)

	frappe.conf.admin_password = frappe.conf.admin_password or admin_password

	remove_missing_apps()

	frappe.db.create_auth_table()
	frappe.db.create_global_search_table()
	frappe.db.create_user_settings_table()

	frappe.flags.in_install_db = False


def install_app(name, verbose=False, set_as_patched=True):
	from frappe.core.doctype.scheduled_job_type.scheduled_job_type import sync_jobs
	from frappe.model.sync import sync_for
	from frappe.modules.utils import sync_customizations
	from frappe.utils.fixtures import sync_fixtures

	frappe.flags.in_install = name
	frappe.flags.ignore_in_install = False

	frappe.clear_cache()
	app_hooks = frappe.get_hooks(app_name=name)
	installed_apps = frappe.get_installed_apps()

	# install pre-requisites
	if app_hooks.required_apps:
		for app in app_hooks.required_apps:
			install_app(app, verbose=verbose)

	frappe.flags.in_install = name
	frappe.clear_cache()

	if name not in frappe.get_all_apps():
		raise Exception("App not in apps.txt")

	if name in installed_apps:
		frappe.msgprint(frappe._("App {0} already installed").format(name))
		return

	print("\nInstalling {0}...".format(name))

	if name != "frappe":
		frappe.only_for("System Manager")

	for before_install in app_hooks.before_install or []:
		out = frappe.get_attr(before_install)()
		if out==False:
			return

	if name != "frappe":
		add_module_defs(name)

	sync_for(name, force=True, reset_permissions=True)

	add_to_installed_apps(name)

	frappe.get_doc('Portal Settings', 'Portal Settings').sync_menu()

	if set_as_patched:
		set_all_patches_as_completed(name)

	for after_install in app_hooks.after_install or []:
		frappe.get_attr(after_install)()

	sync_jobs()
	sync_fixtures(name)
	sync_customizations(name)

	for after_sync in app_hooks.after_sync or []:
		frappe.get_attr(after_sync)() #

	frappe.flags.in_install = False


def add_to_installed_apps(app_name, rebuild_website=True):
	installed_apps = frappe.get_installed_apps()
	if not app_name in installed_apps:
		installed_apps.append(app_name)
		frappe.db.set_global("installed_apps", json.dumps(installed_apps))
		frappe.db.commit()
		if frappe.flags.in_install:
			post_install(rebuild_website)


def remove_from_installed_apps(app_name):
	installed_apps = frappe.get_installed_apps()
	if app_name in installed_apps:
		installed_apps.remove(app_name)
		frappe.db.set_value("DefaultValue", {"defkey": "installed_apps"}, "defvalue", json.dumps(installed_apps))
		_clear_cache("__global")
		frappe.db.commit()
		if frappe.flags.in_install:
			post_install()


def remove_app(app_name, dry_run=False, yes=False, no_backup=False, force=False):
	"""Remove app and all linked to the app's module with the app from a site."""
	import click

	site = frappe.local.site
	app_hooks = frappe.get_hooks(app_name=app_name)

	# dont allow uninstall app if not installed unless forced
	if not force:
		if app_name not in frappe.get_installed_apps():
			click.secho(f"App {app_name} not installed on Site {site}", fg="yellow")
			return

	print(f"Uninstalling App {app_name} from Site {site}...")

	if not dry_run and not yes:
		confirm = click.confirm(
			"All doctypes (including custom), modules related to this app will be"
			" deleted. Are you sure you want to continue?"
		)
		if not confirm:
			return

	if not (dry_run or no_backup):
		from frappe.utils.backups import scheduled_backup

		print("Backing up...")
		scheduled_backup(ignore_files=True)

	frappe.flags.in_uninstall = True

	for before_uninstall in app_hooks.before_uninstall or []:
		frappe.get_attr(before_uninstall)()

	modules = frappe.get_all("Module Def", filters={"app_name": app_name}, pluck="name")

	drop_doctypes = _delete_modules(modules, dry_run=dry_run)
	_delete_doctypes(drop_doctypes, dry_run=dry_run)

	if not dry_run:
		remove_from_installed_apps(app_name)
		frappe.get_single('Installed Applications').update_versions()
		frappe.db.commit()

	for after_uninstall in app_hooks.after_uninstall or []:
		frappe.get_attr(after_uninstall)()

	click.secho(f"Uninstalled App {app_name} from Site {site}", fg="green")
	frappe.flags.in_uninstall = False


def _delete_modules(modules: List[str], dry_run: bool) -> List[str]:
	""" Delete modules belonging to the app and all related doctypes.

		Note: All record linked linked to Module Def are also deleted.

		Returns: list of deleted doctypes."""
	drop_doctypes = []

	doctype_link_field_map = _get_module_linked_doctype_field_map()
	for module_name in modules:
		print(f"Deleting Module '{module_name}'")

		for doctype in frappe.get_all(
			"DocType", filters={"module": module_name}, fields=["name", "issingle"]
		):
			print(f"* removing DocType '{doctype.name}'...")

			if not dry_run:
				if doctype.issingle:
					frappe.delete_doc("DocType", doctype.name, ignore_on_trash=True)
				else:
					drop_doctypes.append(doctype.name)

		_delete_linked_documents(module_name, doctype_link_field_map, dry_run=dry_run)

		print(f"* removing Module Def '{module_name}'...")
		if not dry_run:
			frappe.delete_doc("Module Def", module_name, ignore_on_trash=True, force=True)

	return drop_doctypes


def _delete_linked_documents(
		module_name: str,
		doctype_linkfield_map: Dict[str, str],
		dry_run: bool
	) -> None:

	"""Deleted all records linked with module def"""
	for doctype, fieldname in doctype_linkfield_map.items():
		for record in frappe.get_all(doctype, filters={fieldname: module_name}, pluck="name"):
			print(f"* removing {doctype} '{record}'...")
			if not dry_run:
				frappe.delete_doc(doctype, record, ignore_on_trash=True, force=True)

def _get_module_linked_doctype_field_map() -> Dict[str, str]:
	""" Get all the doctypes which have module linked with them.

		returns ordered dictionary with doctype->link field mapping."""

	# Hardcoded to change order of deletion
	ordered_doctypes = [
			("Workspace", "module"),
			("Report", "module"),
			("Page", "module"),
			("Web Form", "module")
	]
	doctype_to_field_map = OrderedDict(ordered_doctypes)

	linked_doctypes = frappe.get_all(
		"DocField", filters={"fieldtype": "Link", "options": "Module Def"}, fields=["parent", "fieldname"]
	)
	existing_linked_doctypes = [d for d in linked_doctypes if frappe.db.exists("DocType", d.parent)]

	for d in existing_linked_doctypes:
		# DocType deletion is handled separately in the end
		if d.parent not in doctype_to_field_map and d.parent != "DocType":
			doctype_to_field_map[d.parent] = d.fieldname

	return doctype_to_field_map


def _delete_doctypes(doctypes: List[str], dry_run: bool) -> None:
	for doctype in set(doctypes):
		print(f"* dropping Table for '{doctype}'...")
		if not dry_run:
			frappe.delete_doc("DocType", doctype, ignore_on_trash=True)
			frappe.db.sql_ddl(f"DROP TABLE IF EXISTS `tab{doctype}`")


def post_install(rebuild_website=False):
	from frappe.website.utils import clear_website_cache

	if rebuild_website:
		clear_website_cache()

	init_singles()
	frappe.db.commit()
	frappe.clear_cache()


def set_all_patches_as_completed(app):
	patch_path = os.path.join(frappe.get_pymodule_path(app), "patches.txt")
	if os.path.exists(patch_path):
		for patch in frappe.get_file_items(patch_path):
			frappe.get_doc({
				"doctype": "Patch Log",
				"patch": patch
			}).insert(ignore_permissions=True)
		frappe.db.commit()


def init_singles():
	singles = [single['name'] for single in frappe.get_all("DocType", filters={'issingle': True})]
	for single in singles:
		if not frappe.db.get_singles_dict(single):
			doc = frappe.new_doc(single)
			doc.flags.ignore_mandatory=True
			doc.flags.ignore_validate=True
			doc.save()


def make_conf(db_name=None, db_password=None, site_config=None, db_type=None, db_host=None, db_port=None):
	site = frappe.local.site
	make_site_config(db_name, db_password, site_config, db_type=db_type, db_host=db_host, db_port=db_port)
	sites_path = frappe.local.sites_path
	frappe.destroy()
	frappe.init(site, sites_path=sites_path)


def make_site_config(db_name=None, db_password=None, site_config=None, db_type=None, db_host=None, db_port=None):
	frappe.create_folder(os.path.join(frappe.local.site_path))
	site_file = get_site_config_path()

	if not os.path.exists(site_file):
		if not (site_config and isinstance(site_config, dict)):
			site_config = get_conf_params(db_name, db_password)

			if db_type:
				site_config['db_type'] = db_type

			if db_host:
				site_config['db_host'] = db_host

			if db_port:
				site_config['db_port'] = db_port

		with open(site_file, "w") as f:
			f.write(json.dumps(site_config, indent=1, sort_keys=True))


def update_site_config(key, value, validate=True, site_config_path=None):
	"""Update a value in site_config"""
	if not site_config_path:
		site_config_path = get_site_config_path()

	with open(site_config_path, "r") as f:
		site_config = json.loads(f.read())

	# In case of non-int value
	if value in ('0', '1'):
		value = int(value)

	# boolean
	if value == 'false': value = False
	if value == 'true': value = True

	# remove key if value is None
	if value == "None":
		if key in site_config:
			del site_config[key]
	else:
		site_config[key] = value

	with open(site_config_path, "w") as f:
		f.write(json.dumps(site_config, indent=1, sort_keys=True))

	if hasattr(frappe.local, "conf"):
		frappe.local.conf[key] = value


def get_site_config_path():
	return os.path.join(frappe.local.site_path, "site_config.json")


def get_conf_params(db_name=None, db_password=None):
	if not db_name:
		db_name = input("Database Name: ")
		if not db_name:
			raise Exception("Database Name Required")

	if not db_password:
		from frappe.utils import random_string
		db_password = random_string(16)

	return {"db_name": db_name, "db_password": db_password}


def make_site_dirs():
	for dir_path in [
		os.path.join("public", "files"),
		os.path.join("private", "backups"),
		os.path.join("private", "files"),
		"error-snapshots",
		"locks",
		"logs",
	]:
		path = frappe.get_site_path(dir_path)
		os.makedirs(path, exist_ok=True)


def add_module_defs(app):
	modules = frappe.get_module_list(app)
	for module in modules:
		d = frappe.new_doc("Module Def")
		d.app_name = app
		d.module_name = module
		d.save(ignore_permissions=True)


def remove_missing_apps():
	import importlib

	apps = ('frappe_subscription', 'shopping_cart')
	installed_apps = json.loads(frappe.db.get_global("installed_apps") or "[]")
	for app in apps:
		if app in installed_apps:
			try:
				importlib.import_module(app)

			except ImportError:
				installed_apps.remove(app)
				frappe.db.set_global("installed_apps", json.dumps(installed_apps))


def extract_sql_from_archive(sql_file_path):
	"""Return the path of an SQL file if the passed argument is the path of a gzipped
	SQL file or an SQL file path. The path may be absolute or relative from the bench
	root directory or the sites sub-directory.

	Args:
		sql_file_path (str): Path of the SQL file

	Returns:
		str: Path of the decompressed SQL file
	"""
	from frappe.utils import get_bench_relative_path
	sql_file_path = get_bench_relative_path(sql_file_path)
	# Extract the gzip file if user has passed *.sql.gz file instead of *.sql file
	if sql_file_path.endswith('sql.gz'):
		decompressed_file_name = extract_sql_gzip(sql_file_path)
	else:
		decompressed_file_name = sql_file_path

	# convert archive sql to latest compatible
	convert_archive_content(decompressed_file_name)

	return decompressed_file_name


def convert_archive_content(sql_file_path):
	if frappe.conf.db_type == "mariadb":
		# ever since mariaDB 10.6, row_format COMPRESSED has been deprecated and removed
		# this step is added to ease restoring sites depending on older mariaDB servers
		from frappe.utils import random_string
		from pathlib import Path

		old_sql_file_path = Path(f"{sql_file_path}_{random_string(10)}")
		sql_file_path = Path(sql_file_path)

		os.rename(sql_file_path, old_sql_file_path)
		sql_file_path.touch()

		with open(old_sql_file_path) as r, open(sql_file_path, "a") as w:
			for line in r:
				w.write(line.replace("ROW_FORMAT=COMPRESSED", "ROW_FORMAT=DYNAMIC"))

		old_sql_file_path.unlink()


def extract_sql_gzip(sql_gz_path):
	import subprocess

	try:
		# dvf - decompress, verbose, force
		original_file = sql_gz_path
		decompressed_file = original_file.rstrip(".gz")
		cmd = 'gzip -dvf < {0} > {1}'.format(original_file, decompressed_file)
		subprocess.check_call(cmd, shell=True)
	except Exception:
		raise

	return decompressed_file


def extract_files(site_name, file_path):
	import shutil
	import subprocess
	from frappe.utils import get_bench_relative_path

	file_path = get_bench_relative_path(file_path)

	# Need to do frappe.init to maintain the site locals
	frappe.init(site=site_name)
	abs_site_path = os.path.abspath(frappe.get_site_path())

	# Copy the files to the parent directory and extract
	shutil.copy2(os.path.abspath(file_path), abs_site_path)

	# Get the file name splitting the file path on
	tar_name = os.path.split(file_path)[1]
	tar_path = os.path.join(abs_site_path, tar_name)

	try:
		if file_path.endswith(".tar"):
			subprocess.check_output(['tar', 'xvf', tar_path, '--strip', '2'], cwd=abs_site_path)
		elif file_path.endswith(".tgz"):
			subprocess.check_output(['tar', 'zxvf', tar_path, '--strip', '2'], cwd=abs_site_path)
	except:
		raise
	finally:
		frappe.destroy()

	return tar_path


def is_downgrade(sql_file_path, verbose=False):
	"""checks if input db backup will get downgraded on current bench"""

	# This function is only tested with mariadb
	# TODO: Add postgres support
	if frappe.conf.db_type not in (None, "mariadb"):
		return False

	from semantic_version import Version
	head = "INSERT INTO `tabInstalled Application` VALUES"

	with open(sql_file_path) as f:
		for line in f:
			if head in line:
				# 'line' (str) format: ('2056588823','2020-05-11 18:21:31.488367','2020-06-12 11:49:31.079506','Administrator','Administrator',0,'Installed Applications','installed_applications','Installed Applications',1,'frappe','v10.1.71-74 (3c50d5e) (v10.x.x)','v10.x.x'),('855c640b8e','2020-05-11 18:21:31.488367','2020-06-12 11:49:31.079506','Administrator','Administrator',0,'Installed Applications','installed_applications','Installed Applications',2,'your_custom_app','0.0.1','master')
				line = line.strip().lstrip(head).rstrip(";").strip()
				app_rows = frappe.safe_eval(line)
				# check if iterable consists of tuples before trying to transform
				apps_list = app_rows if all(isinstance(app_row, (tuple, list, set)) for app_row in app_rows) else (app_rows, )
				# 'all_apps' (list) format: [('frappe', '12.x.x-develop ()', 'develop'), ('your_custom_app', '0.0.1', 'master')]
				all_apps = [ x[-3:] for x in apps_list ]

				for app in all_apps:
					app_name = app[0]
					app_version = app[1].split(" ")[0]

					if app_name == "frappe":
						try:
							current_version = Version(frappe.__version__)
							backup_version = Version(app_version[1:] if app_version[0] == "v" else app_version)
						except ValueError:
							return False

						downgrade = backup_version > current_version

						if verbose and downgrade:
							print("Your site will be downgraded from Frappe {0} to {1}".format(current_version, backup_version))

						return downgrade


def is_partial(sql_file_path):
	with open(sql_file_path) as f:
		header = " ".join(f.readline() for _ in range(5))
		if "Partial Backup" in header:
			return True
	return False


def partial_restore(sql_file_path, verbose=False):
	sql_file = extract_sql_from_archive(sql_file_path)

	if frappe.conf.db_type in (None, "mariadb"):
		from frappe.database.mariadb.setup_db import import_db_from_sql
	elif frappe.conf.db_type == "postgres":
		from frappe.database.postgres.setup_db import import_db_from_sql
		import warnings
		from click import style
		warn = style(
			"Delete the tables you want to restore manually before attempting"
			" partial restore operation for PostreSQL databases",
			fg="yellow"
		)
		warnings.warn(warn)

	import_db_from_sql(source_sql=sql_file, verbose=verbose)

	# Removing temporarily created file
	if sql_file != sql_file_path:
		os.remove(sql_file)


def validate_database_sql(path, _raise=True):
	"""Check if file has contents and if DefaultValue table exists

	Args:
		path (str): Path of the decompressed SQL file
		_raise (bool, optional): Raise exception if invalid file. Defaults to True.
	"""
	empty_file = False
	missing_table = True

	error_message = ""

	if not os.path.getsize(path):
		error_message = f"{path} is an empty file!"
		empty_file = True

	# dont bother checking if empty file
	if not empty_file:
		with open(path, "r") as f:
			for line in f:
				if 'tabDefaultValue' in line:
					missing_table = False
					break

		if missing_table:
			error_message = "Table `tabDefaultValue` not found in file."

	if error_message:
		import click
		click.secho(error_message, fg="red")

	if _raise and (missing_table or empty_file):
		raise frappe.InvalidDatabaseFile