{%- from "kopia/map.jinja" import kopia with context -%}
#!/usr/bin/env python3
# vim: ft=python

import sys
import argparse
import subprocess

from subprocess import Popen, PIPE

KOPIA_EXEC="/usr/local/bin/kopia"
KOPIA_PASSWORD="{{ params.password|default('') }}"
KOPIA_CONFIG_PATH="/etc/kopia/{{ name }}/repo.config"

ENV = {
    "KOPIA_PASSWORD": KOPIA_PASSWORD,
    "KOPIA_CONFIG_PATH": KOPIA_CONFIG_PATH,
}

parser = argparse.ArgumentParser(prog='{{ name }} backup')


def init(mode="filesystem", path=None, bucket=None, prefix=None, gateway=None, region=None, ak=None, sak=None):
    if mode == "filesystem" and path:
        repo_connect = Popen(f"{KOPIA_EXEC} repository connect filesystem --config-file={KOPIA_CONFIG_PATH} --path={path} -p {KOPIA_PASSWORD}", shell=True, stdout=PIPE, stderr=PIPE)
        repo_create = Popen(f"{KOPIA_EXEC} repository create filesystem --config-file={KOPIA_CONFIG_PATH} --path={path} -p {KOPIA_PASSWORD}" , shell=True, stdout=PIPE, stderr=PIPE)
    elif mode == "s3" and prefix and gateway and region and ak and sak:
        cmd_create = f"{KOPIA_EXEC} repository create s3 --config-file={KOPIA_CONFIG_PATH} --bucket={bucket} --prefix={prefix}/ --endpoint={gateway} --region={region} --access-key={ak} --secret-access-key={sak} -p {KOPIA_PASSWORD} --no-check-for-updates --description='{{ name }} repository'"
        cmd_connect = f"{KOPIA_EXEC} repository connect s3 --config-file={KOPIA_CONFIG_PATH} --bucket={bucket} --prefix={prefix}/ --endpoint={gateway} --region={region} --access-key={ak} --secret-access-key={sak} -p {KOPIA_PASSWORD} --no-check-for-updates --description='{{ name }} repository'"
        run_create = Popen(cmd_create, shell=True, stdout=PIPE, stderr=PIPE)
        run_create.wait()
        if run_create.returncode == 0:
            print("successfully created repository")
        run_connect = Popen(cmd_connect, shell=True, stdout=PIPE, stderr=PIPE)
        run_connect.wait()
        if run_connect.returncode == 0:
            print("successfully connected to repository")
    else:
        print("no valid mode or missing informations")
        return None
    return True


def set_policy(compression="zstd"):
    cmd_policy = f"{KOPIA_EXEC} policy set --global --config-file={KOPIA_CONFIG_PATH} --compression={compression} --keep-latest={{ params.keep_latest|default(7) }} --keep-hourly 0 --keep-daily {{ params.keep_daily|default(7) }} --keep-weekly {{ params.keep_weekly|default(4) }} --keep-monthly {{ params.keep_monthly|default(6) }} --keep-annual 0 --one-file-system=true"
    run_policy = Popen(cmd_policy, shell=True, stdout=PIPE, stderr=PIPE)
    run_policy.wait()
    if run_policy.returncode == 0:
        print("successfully set repository policy")
    return run_policy.returncode == 0


def set_cache(size=500, limit=1000):
    rcs = []
    cmds_cache = [f"{KOPIA_EXEC} cache set --content-cache-size-mb {size} --config-file={KOPIA_CONFIG_PATH}",
                  f"{KOPIA_EXEC} cache set --content-cache-size-limit-mb {limit} --config-file={KOPIA_CONFIG_PATH}"]
    for cmd_cache in cmds_cache:
        run_cache = Popen(cmd_cache, shell=True, stdout=PIPE, stderr=PIPE)
        run_cache.wait()
        rcs.append(run_cache.returncode == 0)
    if all(rcs):
        print("successfully set cache policy")
    return all(rcs)


def run(before_tasks=[]):
    rcs = []
    for cmd_task in before_tasks:
        run_task = Popen(cmd_task, shell=True)
        run_task.wait()
        rcs.append(run_task.returncode == 0)
    if not all(rcs):
        return False

    cmd_launch = f"{KOPIA_EXEC} snapshot create {{ params.dirs|map(attribute='path')|join(' ') }} --config-file={KOPIA_CONFIG_PATH}"
    run_launch = Popen(cmd_launch, shell=True)
    run_launch.wait()
    return run_launch.returncode == 0


def list_snapshots():
    cmd_list = f"{KOPIA_EXEC} snapshot list --config-file={KOPIA_CONFIG_PATH}"
    run_list = Popen(cmd_list, shell=True)
    run_list.wait()
    return run_list.returncode == 0


if __name__ == "__main__":
    parser.add_argument('action', nargs="?")
    args = parser.parse_args()

    res_init = init(mode="s3", bucket="kopia", prefix="{{ name }}", gateway="{{ kopia.repos[params.repo].gateway|default('gateway.storjshare.io') }}", region="{{ kopia.repos[params.repo].region|default('EU1') }}", ak="{{ kopia.repos[params.repo].ak }}", sak="{{ kopia.repos[params.repo].sak }}")
    if not res_init:
        print("init error")
        sys.exit(1)

    if args.action == "run":
        if not set_policy():
            print("set policy error")
            sys.exit(1)
        if not set_cache({{ kopia.repos[params.repo].cache_size|default(500) }},{{ kopia.repos[params.repo].cache_limit|default(1000) }}):
            print("set cache error")
            sys.exit(1)
        if not run(before_tasks={{ params.before_tasks|default([]) }}):
            print("run error")
            sys.exit(1)
    elif args.action == "env":
        print();print("# source this to use kopia with this repo")
        for k,v in ENV.items():
            print(f"export {k}=\"{v}\"")
    else:
        list_snapshots()