"""Deterministic surface rendering for a propositional ``EntailmentTrace``
(deduction-serve arc, Phase 1).

Renders the four ``Entailment`` outcomes into user-facing prose. Deterministic
templates only — no LLM, no synthesis; every visible token is either fixed
prose or a formula string ``to_deductive_logic`` produced directly from the
user's own text. This is the ONLY renderer for propositional-deduction
serving; it must not be confused with ``generate.determine.render`` (which
renders realized-structure DETERMINE answers — a different gear entirely).
"""

from __future__ import annotations

from generate.morphology import pluralize
from generate.proof_chain.entail import (
    INCONSISTENT_PREMISES,
    Entailment,
    EntailmentTrace,
)

#: A/E/I/O categorical form → an English sentence template over (subject, predicate).
#:
#: Every template takes a PLURAL noun on both sides — ``all``/``no``/``some``
#: with ``are``. The slots are filled from canonical entity ids, which are
#: SINGULAR lowercase lemmas (``dog``, ``mammal``), so filling them raw emitted
#: ``all dog are mammal``. Phase 2B re-inflects at render time; see
#: :func:`_display_noun`.
_CATEGORICAL_PHRASE = {
    "A": "all {s} are {p}",
    "E": "no {s} are {p}",
    "I": "some {s} are {p}",
    "O": "some {s} are not {p}",
}


def render_entailment(
    trace: EntailmentTrace, premises: tuple[str, ...], query: str
) -> str:
    """The user-facing surface for a propositional deduction verdict.

    Every branch is a fixed template around the literal premise/query
    formula strings — no fabricated content. ``trace.outcome`` selects the
    template; REFUSED further branches on ``trace.reason`` since an
    inconsistent-premises refusal and an out-of-regime refusal warrant
    different honest phrasing.
    """
    given = "; ".join(premises)
    if trace.outcome is Entailment.ENTAILED:
        return f"Given: {given}. Your premises entail: {query}."
    if trace.outcome is Entailment.REFUTED:
        return (
            f"Given: {given}. Your premises entail the opposite of "
            f"{query} — it cannot hold."
        )
    if trace.outcome is Entailment.UNKNOWN:
        return (
            f"Given: {given}. Your premises don't settle whether "
            f"{query} — it holds in some cases and fails in others."
        )
    # REFUSED
    if trace.reason == INCONSISTENT_PREMISES:
        return (
            f"Given: {given}. Those premises are inconsistent — they "
            f"can't all be true, so I won't assert anything from them."
        )
    return f"Given: {given}. I can't evaluate {query} from that as stated."


def render_entailment_english(
    trace: EntailmentTrace, premise_texts: tuple[str, ...], query_text: str
) -> str:
    """The user-facing surface for an English-clause (Band v2-EN) verdict.

    Same four-outcome discipline as :func:`render_entailment`, but the visible
    tokens are the user's own normalized clauses (``EnglishArgument`` texts),
    not formula strings. The ONE deliberate divergence is the UNKNOWN template:
    an opaque-atom "doesn't settle" is only true *of the reading* (internal
    clause structure this band did not parse could settle it — ADR-0257 §3),
    so the phrasing scopes the claim to that reading explicitly. ENTAILED /
    REFUTED / inconsistent are substitution-closed — true under any deeper
    reading — and are stated at full strength.
    """
    given = "; ".join(premise_texts)
    if trace.outcome is Entailment.ENTAILED:
        return f"Given: {given}. Your premises entail: {query_text}."
    if trace.outcome is Entailment.REFUTED:
        return (
            f"Given: {given}. Your premises entail the opposite of "
            f"{query_text} — it cannot hold."
        )
    if trace.outcome is Entailment.UNKNOWN:
        return (
            f"Given: {given}. Reading each clause as one indivisible claim, "
            f"your premises don't settle whether {query_text} — it holds in "
            f"some cases and fails in others."
        )
    # REFUSED
    if trace.reason == INCONSISTENT_PREMISES:
        return (
            f"Given: {given}. Those premises are inconsistent — they "
            f"can't all be true, so I won't assert anything from them."
        )
    return f"Given: {given}. I can't evaluate {query_text} from that as stated."


def render_entailment_member(
    trace: EntailmentTrace, premise_texts: tuple[str, ...], query_text: str
) -> str:
    """The user-facing surface for a member-argument (Band v3-MEM) verdict.

    Same discipline as :func:`render_entailment_english`; the UNKNOWN template
    scopes itself to THIS band's reading (ADR-0258 §3): distinct names are
    read as distinct individuals and class words at face value — co-reference
    or an unlinked class identity could settle what the lowering leaves open,
    so the claim is stated of the reading, disclosed as such. ENTAILED /
    REFUTED / inconsistent survive any such refinement (instantiation is
    sound and entailment is monotone) and are stated at full strength.
    """
    given = "; ".join(premise_texts)
    if trace.outcome is Entailment.ENTAILED:
        return f"Given: {given}. Your premises entail: {query_text}."
    if trace.outcome is Entailment.REFUTED:
        return (
            f"Given: {given}. Your premises entail the opposite of "
            f"{query_text} — it cannot hold."
        )
    if trace.outcome is Entailment.UNKNOWN:
        return (
            f"Given: {given}. Reading each name as one individual and each "
            f"class word at face value, your premises don't settle whether "
            f"{query_text} — it holds in some cases and fails in others."
        )
    # REFUSED
    if trace.reason == INCONSISTENT_PREMISES:
        return (
            f"Given: {given}. Those premises are inconsistent — they "
            f"can't all be true, so I won't assert anything from them."
        )
    return f"Given: {given}. I can't evaluate {query_text} from that as stated."


def render_entailment_verb(
    trace: EntailmentTrace, premise_texts: tuple[str, ...], query_text: str
) -> str:
    """The user-facing surface for a verb-predicate (Band v5-VP) verdict.

    Same discipline as :func:`render_entailment_member`; the UNKNOWN template
    additionally scopes the verb reading (ADR-0260 §3): each verb phrase is
    read at face value — an unlinked agreement form or an unstated relation
    between a verb and a class word could settle what the lowering leaves
    open, so the claim is stated of the reading, disclosed as such. ENTAILED /
    REFUTED / inconsistent survive any such refinement (instantiation is
    sound and entailment is monotone) and are stated at full strength.
    """
    given = "; ".join(premise_texts)
    if trace.outcome is Entailment.ENTAILED:
        return f"Given: {given}. Your premises entail: {query_text}."
    if trace.outcome is Entailment.REFUTED:
        return (
            f"Given: {given}. Your premises entail the opposite of "
            f"{query_text} — it cannot hold."
        )
    if trace.outcome is Entailment.UNKNOWN:
        return (
            f"Given: {given}. Reading each name as one individual and each "
            f"class word and verb phrase at face value, your premises don't "
            f"settle whether {query_text} — it holds in some cases and fails "
            f"in others."
        )
    # REFUSED
    if trace.reason == INCONSISTENT_PREMISES:
        return (
            f"Given: {given}. Those premises are inconsistent — they "
            f"can't all be true, so I won't assert anything from them."
        )
    return f"Given: {given}. I can't evaluate {query_text} from that as stated."


def render_entailment_exist(
    trace: EntailmentTrace, premise_texts: tuple[str, ...], query_text: str
) -> str:
    """The user-facing surface for an existential (Band v6-EX) verdict.

    Same discipline as :func:`render_entailment_verb`; the UNKNOWN template
    additionally discloses the ONE reading choice existentials force
    (ADR-0261 §3): "some" is read WITHOUT existential import, so a universal
    says nothing about whether its class has members. That is precisely what
    makes "all C are P, therefore some C are P" come out unsettled rather than
    entailed, and a reader who expects the traditional square deserves to be
    told which square this is. ENTAILED / REFUTED / inconsistent hold under
    the classical reading too (adding existential-import premises only ADDS
    premises, and entailment is monotone), so they are stated at full strength.
    """
    given = "; ".join(premise_texts)
    if trace.outcome is Entailment.ENTAILED:
        return f"Given: {given}. Your premises entail: {query_text}."
    if trace.outcome is Entailment.REFUTED:
        return (
            f"Given: {given}. Your premises entail the opposite of "
            f"{query_text} — it cannot hold."
        )
    if trace.outcome is Entailment.UNKNOWN:
        return (
            f"Given: {given}. Reading each name as one individual, each class "
            f"word and verb phrase at face value, and \"some\" as claiming a "
            f"member exists (so \"all\" does not), your premises don't settle "
            f"whether {query_text} — it holds in some cases and fails in others."
        )
    # REFUSED
    if trace.reason == INCONSISTENT_PREMISES:
        return (
            f"Given: {given}. Those premises are inconsistent — they "
            f"can't all be true, so I won't assert anything from them."
        )
    return f"Given: {given}. I can't evaluate {query_text} from that as stated."


def _display_noun(term: str) -> str:
    """A canonical entity id → the plural noun phrase a categorical clause needs.

    Two transformations, both required for well-formed output:

    1. **Number.** Ids are singular lemmas but every A/E/I/O template supplies
       ``all``/``no``/``some`` + ``are``, which demand a plural. Mass nouns are
       left alone by :func:`generate.morphology.pluralize` ("all evidence", not
       "all evidences").
    2. **Word separator.** Ids join tokens with ``_`` (``guard_dog``), which is
       machine syntax, not English. Compounds inflect on the head, so
       pluralizing before the swap gives "guard dogs" rather than "guards dog".

    Deliberately NOT done here: mass-noun verb agreement. "all evidence are
    truth" should read "all evidence is truth", but the copula is fixed text
    inside the templates, and making it agree changes the template shape rather
    than the slot. Left as a separate, smaller defect — no mass noun currently
    reaches a categorical clause in any serve corpus.
    """
    if not term:
        return term
    return pluralize(term).replace("_", " ")


def _categorical_clause(prop: dict) -> str:
    """One categorical proposition dict → its English clause."""
    template = _CATEGORICAL_PHRASE.get(prop.get("form", ""), "{s} ~ {p}")
    return template.format(
        s=_display_noun(prop.get("subject", "?")),
        p=_display_noun(prop.get("predicate", "?")),
    )


def render_syllogism(trace: EntailmentTrace, structure: dict, query: dict) -> str:
    """The user-facing surface for a categorical (syllogism) verdict.

    Deterministic templates over the argument's own clauses — no synthesis. The
    ``EntailmentTrace`` is the propositional-lowering decision (``ENTAILED`` ⇒
    valid; ``UNKNOWN``/``REFUTED`` ⇒ invalid; ``REFUSED`` ⇒ inconsistent).
    """
    premises = "; ".join(
        _categorical_clause(p) for p in structure.get("premises", [])
    )
    conclusion = _categorical_clause(query.get("conclusion", {}))
    if trace.outcome is Entailment.ENTAILED:
        return f"Given: {premises}. That's valid — {conclusion} follows."
    if trace.outcome is Entailment.REFUSED and trace.reason == INCONSISTENT_PREMISES:
        return (
            f"Given: {premises}. Those premises are inconsistent — they can't all "
            f"be true, so I won't assert anything from them."
        )
    if trace.outcome is Entailment.REFUSED:
        return f"Given: {premises}. I can't evaluate {conclusion} from that as stated."
    # UNKNOWN or REFUTED — the conclusion is not forced by the premises.
    return (
        f"Given: {premises}. That doesn't follow — {conclusion} isn't guaranteed "
        f"by those premises."
    )


__all__ = [
    "render_entailment",
    "render_entailment_english",
    "render_entailment_exist",
    "render_entailment_member",
    "render_entailment_verb",
    "render_syllogism",
]