from __future__ import annotations

from typing import Any


def strict_phone(value: str) -> bool:
    return (
        len(value) == 11
        and value.isascii()
        and value.isdigit()
        and value[0] == "1"
        and value[1] in "3456789"
    )


def mask_phone(value: Any) -> str | None:
    if not isinstance(value, str) or len(value) != 11:
        return None
    return f"{value[:3]}****{value[-4:]}"


def valid_month(value: Any) -> bool:
    if not isinstance(value, str) or len(value) != 7 or value[4] != "-":
        return False
    year, month = value.split("-", 1)
    return (
        year.isdigit()
        and month.isdigit()
        and 1900 <= int(year) <= 2100
        and 1 <= int(month) <= 12
    )


def anchor_missing_fields(
    profile: dict[str, Any], required: list[str]
) -> list[str]:
    anchor = profile.get("anchor", {})
    missing = [field for field in required if not _present(anchor.get(field))]
    start = anchor.get("start_date")
    end = anchor.get("end_date_or_present")
    if start and not valid_month(start) and "start_date" not in missing:
        missing.append("start_date")
    if end and end != "present" and not valid_month(end) and "end_date_or_present" not in missing:
        missing.append("end_date_or_present")
    if valid_month(start) and valid_month(end) and end < start and "end_date_or_present" not in missing:
        missing.append("end_date_or_present")
    return missing


def can_create_resume(profile: dict[str, Any], missing: list[str]) -> bool:
    return bool(
        profile.get("privacy_accepted")
        and strict_phone(str(profile.get("phone") or ""))
        and str(profile.get("name") or "").strip()
        and profile.get("job_type") in {"campus", "social", "other"}
        and profile.get("anchor_type")
        and profile.get("anchor_confirmed")
        and not missing
    )


def _present(value: Any) -> bool:
    return bool(value.strip()) if isinstance(value, str) else value is not None