"""Candidate rewrite contract: Builder presents expander results without lexical inference."""

from __future__ import annotations
from types import SimpleNamespace

from typing import Any

from app.builder_conversation import _candidate_rewrite


class _StaticExpander:
    def __init__(self, optimized: str, uncovered: list[str] | None = None) -> None:
        self.optimized = optimized
        self.uncovered = uncovered or []

    def expand(self, entry: dict[str, Any], *, context: dict[str, Any]) -> dict[str, Any]:
        return {"optimized_description": self.optimized, "uncovered_facts": self.uncovered, "source": "test"}


class _Agent:
    def __init__(self, optimized: str, uncovered: list[str] | None = None) -> None:
        self.expander = _StaticExpander(optimized, uncovered)


def test_candidate_rewrite_does_not_inject_identity_into_education_description() -> None:
    proposal = _candidate_rewrite(
        _Agent("\u5728\u5b66\u6821\u4e2d\u5b66\u4e60\u6570\u636e\u7ed3\u6784\u3002"),
        {"job_type": "campus"},
        {"school": "\u4e1c\u839e\u57ce\u5e02\u5b66\u9662", "description": "\u5728\u5b66\u6821\u4e2d\u5b66\u4e60\u6570\u636e\u7ed3\u6784\u3002"},
        "education",
    )

    assert proposal["optimized_description"] == "\u5728\u5b66\u6821\u4e2d\u5b66\u4e60\u6570\u636e\u7ed3\u6784\u3002"
    assert "\u4e1c\u839e\u57ce\u5e02\u5b66\u9662" not in proposal["optimized_description"]


def test_candidate_rewrite_uses_expander_objective_omissions_verbatim() -> None:
    omitted = ["GPA: 4.3/5.0", "top10"]
    proposal = _candidate_rewrite(
        _Agent("\u5b8c\u6210\u6570\u636e\u5e93\u8bfe\u7a0b\u9879\u76ee\u3002", omitted),
        {"job_type": "campus"},
        {"description": "\u5b8c\u6210\u6570\u636e\u5e93\u8bfe\u7a0b\u9879\u76ee\u3002GPA: 4.3/5.0\u3002"},
        "education",
    )

    assert proposal["uncovered_facts"] == omitted


def test_candidate_rewrite_does_not_lexically_flag_a_paraphrase() -> None:
    proposal = _candidate_rewrite(
        _Agent("\u8d1f\u8d23 AI \u7b80\u5386\u751f\u6210\u4e0e\u6587\u4ef6\u89e3\u6790\u6a21\u5757\u3002"),
        {"job_type": "campus"},
        {"description": "AI \u5bf9\u8bdd\u5f0f\u7b80\u5386\u751f\u6210\u52a9\u624b\uff1b\u7b80\u5386\u5bfc\u5165\u667a\u80fd\u89e3\u6790\u3002"},
        "project_experience",
    )

    assert proposal["uncovered_facts"] == []


def test_candidate_rewrite_never_appends_raw_source_to_a_candidate() -> None:
    raw = "\u5b66\u4e60\u6570\u636e\u7ed3\u6784\u3002GPA: 4.3/5.0\u3002"
    proposal = _candidate_rewrite(
        _Agent("\u4e3b\u4fee\u8bfe\u7a0b\uff1a\u6570\u636e\u7ed3\u6784\u3002", ["GPA: 4.3/5.0"]),
        {"job_type": "campus"},
        {"description": raw},
        "education",
    )

    assert proposal["optimized_description"] == "\u4e3b\u4fee\u8bfe\u7a0b\uff1a\u6570\u636e\u7ed3\u6784\u3002"
    assert "GPA: 4.3/5.0" not in proposal["optimized_description"]
def test_candidate_rewrite_does_not_present_unavailable_output_as_ai_draft() -> None:
    class _UnavailableExpander:
        def expand(self, entry: dict[str, Any], *, context: dict[str, Any]) -> dict[str, Any]:
            raise TimeoutError("gateway timed out")

    proposal = _candidate_rewrite(
        SimpleNamespace(expander=_UnavailableExpander()),
        {"job_type": "campus"},
        {"description": "Original confirmed description."},
        "project_experience",
    )

    assert proposal["optimized_description"] == ""
    assert proposal["optimization_unavailable"] is True
    assert proposal["generation_source"] == "unavailable"
    assert proposal["fallback_reason"] == "timeouterror"