import re
from typing import Literal, Tuple


Intent = Literal["attendance", "result", "syllabus", "other"]


def classify_intent(query: str) -> Tuple[Intent, bool]:
    q = query.strip().lower()

    if not q:
        return "other", False

    greeting_words = {
        "hi",
        "hello",
        "hey",
        "good morning",
        "good afternoon",
        "good evening",
    }

    attendance_keywords = {
        "attendance",
        "attend",
        "absent",
        "present",
        "classes",
        "attendance percentage",
        "overall attendance",
    }

    result_keywords = {
        "result",
        "results",
        "marks",
        "score",
        "sgpa",
        "cgpa",
        "gpa",
        "grade",
        "ia",
        "exam",
        "performance",
        "passed",
        "fail",
    }

    syllabus_keywords = {
        "syllabus",
        "unit",
        "units",
        "module",
        "modules",
        "topic",
        "topics",
        "course content",
        "chapters",
        "what is covered",
    }

    education_keywords = (
        attendance_keywords
        | result_keywords
        | syllabus_keywords
        | {
            "semester",
            "course",
            "subject",
            "study",
            "assignment",
            "project",
            "college",
            "class",
            "exam prep",
        }
    )

    has_course_code = bool(re.search(r"\b\d{2}[a-z]{2,}[a-z0-9]*\d+[a-z]?\b", q, flags=re.I))

    is_greeting = any(word in q for word in greeting_words)
    is_education = has_course_code or any(k in q for k in education_keywords) or is_greeting

    if any(k in q for k in attendance_keywords):
        return "attendance", is_education
    if any(k in q for k in result_keywords):
        return "result", is_education
    if any(k in q for k in syllabus_keywords):
        return "syllabus", is_education

    return "other", is_education