# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

from __future__ import absolute_import, print_function, unicode_literals

import json
import os

from ..cli import BaseTryParser
from ..push import push_to_try, history_path


class AgainParser(BaseTryParser):
    name = "again"
    arguments = [
        [
            ["--index"],
            {
                "default": 0,
                "type": int,
                "help": "Index of entry in the history to re-push, "
                "where '0' is the most recent (default 0). "
                "Use --list to display indices.",
            },
        ],
        [
            ["--list"],
            {
                "default": False,
                "action": "store_true",
                "dest": "list_configs",
                "help": "Display history and exit",
            },
        ],
        [
            ["--list-tasks"],
            {
                "default": 0,
                "action": "count",
                "dest": "list_tasks",
                "help": "Like --list, but display selected tasks  "
                "for each history entry, up to 10. Repeat "
                "to display all selected tasks.",
            },
        ],
        [
            ["--purge"],
            {
                "default": False,
                "action": "store_true",
                "help": "Remove all history and exit",
            },
        ],
    ]
    common_groups = ["push"]


def run(
    index=0, purge=False, list_configs=False, list_tasks=0, message="{msg}", **pushargs
):
    if purge:
        os.remove(history_path)
        return

    if not os.path.isfile(history_path):
        print("error: history file not found: {}".format(history_path))
        return 1

    with open(history_path, "r") as fh:
        history = fh.readlines()

    if list_configs or list_tasks > 0:
        for i, data in enumerate(history):
            msg, config = json.loads(data)
            version = config.get("version", "1")
            if version == 1:
                tasks = config["tasks"]
            elif version == 2:
                try_config = config.get("parameters", {}).get("try_task_config", {})
                tasks = try_config.get("tasks")
            else:
                tasks = None

            if tasks is not None:
                n = len(tasks)

                print(
                    "{index}. ({n} task{s}) {msg}".format(
                        index=i, msg=msg, n=n, s="" if n == 1 else "s"
                    )
                )

                if list_tasks > 0:
                    indent = " " * 4
                    if list_tasks > 1:
                        shown_tasks = tasks
                    else:
                        shown_tasks = tasks[:10]
                    print(indent + ("\n" + indent).join(shown_tasks))

                    num_hidden_tasks = len(tasks) - len(shown_tasks)
                    if num_hidden_tasks > 0:
                        print("{}... and {} more".format(indent, num_hidden_tasks))
            else:
                print(
                    "{index}. {msg}".format(
                        index=i,
                        msg=msg,
                    )
                )

        return

    msg, try_task_config = json.loads(history[index])
    return push_to_try(
        "again", message.format(msg=msg), try_task_config=try_task_config, **pushargs
    )