from datetime import datetime
from typing import Sequence

from ..checkmk import Downtime, ServiceState
from ..models import state_name
from .constants import HISTORY_LIMIT, LINE_OUTPUT_MAX, LIST_LIMIT, TS_FORMAT
from .sanitize import sanitize

NONE_FOUND = "Keine Einträge."


def _line_text(value: object, limit: int = LINE_OUTPUT_MAX) -> str:
    return sanitize(value, limit, single_line=True)


def _ts(value: int) -> str:
    return datetime.fromtimestamp(value).strftime(TS_FORMAT) if value else "unbekannt"


def service_line(item: ServiceState, with_host: bool = True) -> str:
    name = f"{_line_text(item.host, 100)} / {_line_text(item.service, 100)}" if with_host \
        else _line_text(item.service, 100)
    flags = []
    if not item.hard:
        flags.append("soft")
    if item.in_downtime:
        flags.append("Downtime")
    if item.flapping:
        flags.append("flappt")
    suffix = f" [{', '.join(flags)}]" if flags else ""
    return f"{state_name(item.state)} {name}{suffix}: {_line_text(item.output)}"


def format_status(item: ServiceState | None) -> str:
    if item is None:
        return "Service nicht gefunden."
    return f"{service_line(item)} (seit {_ts(item.last_state_change)})"


def _limited(lines: list[str]) -> str:
    if not lines:
        return NONE_FOUND
    extra = len(lines) - LIST_LIMIT
    text = "\n".join(lines[:LIST_LIMIT])
    return f"{text}\n... und {extra} weitere" if extra > 0 else text


def format_services(items: Sequence[ServiceState], with_host: bool = True) -> str:
    ordered = sorted(items, key=lambda i: (-i.state, i.host, i.service))
    return _limited([service_line(i, with_host) for i in ordered])


def format_history(changes: Sequence) -> str:
    lines = [f"{_ts(c.ts)} {state_name(c.state)}" for c in list(changes)[:HISTORY_LIMIT]]
    return "\n".join(lines) if lines else NONE_FOUND


def format_downtimes(items: Sequence[Downtime]) -> str:
    lines = []
    for item in items:
        target = _line_text(item.host, 100) + (f" / {_line_text(item.service, 100)}" if item.service else "")
        lines.append(f"{target}: {_line_text(item.start, 40)} bis {_line_text(item.end, 40)}, "
                     f"{_line_text(item.comment)}")
    return _limited(lines)