# !/usr/bin/env python3
import argparse
import dataclasses
import datetime
import json
import logging
from typing import Any

from clan_cli.clan.inspect import FlakeConfig, inspect_flake
from clan_cli.machines.list import list_machines

from ..clan_uri import ClanURI
from ..dirs import user_history_file
from ..errors import ClanError
from ..locked_open import read_history_file, write_history_file

log = logging.getLogger(__name__)


@dataclasses.dataclass
class HistoryEntry:
    last_used: str
    flake: FlakeConfig
    settings: dict[str, Any] = dataclasses.field(default_factory=dict)

    def __post_init__(self) -> None:
        if isinstance(self.flake, dict):
            self.flake = FlakeConfig(**self.flake)


def _merge_dicts(d1: dict, d2: dict) -> dict:
    # create a new dictionary that copies d1
    merged = dict(d1)
    # iterate over the keys and values of d2
    for key, value in d2.items():
        # if the key is in d1 and both values are dictionaries, merge them recursively
        if key in d1 and isinstance(d1[key], dict) and isinstance(value, dict):
            merged[key] = _merge_dicts(d1[key], value)
        # otherwise, update the value of the key in the merged dictionary
        else:
            merged[key] = value
    # return the merged dictionary
    return merged


def list_history() -> list[HistoryEntry]:
    logs: list[HistoryEntry] = []
    if not user_history_file().exists():
        return []

    try:
        parsed = read_history_file()
        for i, p in enumerate(parsed.copy()):
            # Everything from the settings dict is merged into the flake dict, and can override existing values
            parsed[i] = _merge_dicts(p, p.get("settings", {}))
        logs = [HistoryEntry(**p) for p in parsed]
    except (json.JSONDecodeError, TypeError) as ex:
        raise ClanError(f"History file at {user_history_file()} is corrupted") from ex

    return logs


def new_history_entry(url: str, machine: str) -> HistoryEntry:
    flake = inspect_flake(url, machine)
    flake.flake_url = str(flake.flake_url)
    return HistoryEntry(
        flake=flake,
        last_used=datetime.datetime.now().isoformat(),
    )


def add_all_to_history(uri: ClanURI) -> list[HistoryEntry]:
    history = list_history()
    new_entries: list[HistoryEntry] = []
    for machine in list_machines(uri.get_url()):
        new_entry = _add_maschine_to_history_list(uri.get_url(), machine, history)
        new_entries.append(new_entry)
    write_history_file(history)
    return new_entries


def add_history(uri: ClanURI) -> HistoryEntry:
    user_history_file().parent.mkdir(parents=True, exist_ok=True)
    history = list_history()
    new_entry = _add_maschine_to_history_list(uri.get_url(), uri.machine.name, history)
    write_history_file(history)
    return new_entry


def _add_maschine_to_history_list(
    uri_path: str, uri_machine: str, entries: list[HistoryEntry]
) -> HistoryEntry:
    for new_entry in entries:
        if (
            new_entry.flake.flake_url == str(uri_path)
            and new_entry.flake.flake_attr == uri_machine
        ):
            new_entry.last_used = datetime.datetime.now().isoformat()
            return new_entry

    new_entry = new_history_entry(uri_path, uri_machine)
    entries.append(new_entry)
    return new_entry


def add_history_command(args: argparse.Namespace) -> None:
    if args.all:
        add_all_to_history(args.uri)
    else:
        add_history(args.uri)


# takes a (sub)parser and configures it
def register_add_parser(parser: argparse.ArgumentParser) -> None:
    parser.add_argument("uri", type=ClanURI, help="Path to the flake", default=".")
    parser.add_argument(
        "--all", help="Add all machines", default=False, action="store_true"
    )
    parser.set_defaults(func=add_history_command)