"""The one shape every knowledge-base record becomes.

Each collector emits its own field names — an AnchorLink org has `summary` and
`categories`, a directory entity has `evidence_quote` and `building_slug`, a
course has `credit_hours` and AXLE tags. Retrieval, filtering, and citation all
want one shape, so every source gets an adapter in `normalize.py` that produces
`Doc`s and stows the source-specific fields in `extra`.

`id` is source-prefixed (`"anchorlink:org:428475"`) so it's stable across
rebuilds and unambiguous when a tool result is cited back.
"""
from __future__ import annotations

from dataclasses import dataclass, field

# The four First View / Foresight domains, in canonical order.
DOMAINS = ("strengths", "crew", "future", "vu")


@dataclass(frozen=True, slots=True)
class Doc:
    id: str
    source: str                       # anchorlink | events | academics | directory |
                                      # buildings | residential | study-abroad |
                                      # funding | immersion | yes
    kind: str                         # organization | event | course | program |
                                      # requirement | office | building | house |
                                      # award | resource | policy | page
    title: str
    text: str                         # the searchable blob
    url: str | None = None
    domains: tuple[str, ...] = ()
    start: str | None = None          # ISO date — events, deadlines, milestones
    end: str | None = None
    extra: dict = field(default_factory=dict, compare=False)

    def cite(self) -> dict:
        """The citation chip the UI renders for this document."""
        return {"label": self.title, "url": self.url, "source": SOURCE_LABELS.get(self.source, self.source)}


# Student-facing names. "anchorlink" is a thing students actually say; "study-abroad"
# as a slug is not.
SOURCE_LABELS = {
    "anchorlink": "AnchorLink",
    "events": "Campus events",
    "academics": "Course catalog",
    "directory": "Campus directory",
    "buildings": "Campus map",
    "residential": "Housing & residential life",
    "study-abroad": "Global Education Office",
    "funding": "Scholarships & fellowships",
    "immersion": "Immersion Vanderbilt",
    "recreation": "Recreation & sports",
    "yes": "YES class schedule",
}