"""Structure is part of the grade: malformed CSV fails even when the values are right, while
harmless representation differences (quoting, a trailing blank line, CRLF) still pass."""

import csv
import io
import os
import tempfile

import pytest

os.environ.setdefault("TERMINAL_DESK_APP", tempfile.mkdtemp(prefix="td-struct-"))

from terminal_desk.core.grading import render_artifact  # noqa: E402
from terminal_desk.families import all_task_ids, reserved_task_ids  # noqa: E402
from terminal_desk.models import Tbench2Action  # noqa: E402
from terminal_desk.server.environment import TerminalDeskEnvironment  # noqa: E402


def csv_tasks():
    out = []
    for t in all_task_ids() + reserved_task_ids():
        env = TerminalDeskEnvironment()
        env.reset(task_id=t)
        if env._ep["built"].artifact.path.endswith(".csv"):
            out.append(t)
    return out


CSV_TASKS = csv_tasks()


def grade(task_id: str, mutate) -> float:
    env = TerminalDeskEnvironment()
    env.reset(task_id=task_id)
    built = env._ep["built"]
    art = built.artifact
    for path, text in built.notes.get("oracle_files", {}).items():
        env.step(Tbench2Action(action_type="write_file", file_path=path, content=text))
    content = mutate(render_artifact(art))
    env.step(Tbench2Action(action_type="write_file", file_path=art.path, content=content))
    return env.step(Tbench2Action(action_type="evaluate")).reward


def extra_field_every_row(text):
    head, *rows = text.rstrip("\n").split("\n")
    return "\n".join([head] + [r + ",extra" for r in rows]) + "\n"


def extra_field_one_row(text):
    head, first, *rest = text.rstrip("\n").split("\n")
    return "\n".join([head, first + ",extra"] + rest) + "\n"


def missing_field_one_row(text):
    head, first, *rest = text.rstrip("\n").split("\n")
    return "\n".join([head, first.rsplit(",", 1)[0]] + rest) + "\n"


def requote_all(text):
    out = io.StringIO()
    csv.writer(out, quoting=csv.QUOTE_ALL, lineterminator="\r\n").writerows(csv.reader(io.StringIO(text)))
    return out.getvalue() + "\r\n"


def test_csv_tasks_found():
    assert len(CSV_TASKS) >= 4, CSV_TASKS


@pytest.mark.parametrize("task_id", CSV_TASKS)
@pytest.mark.parametrize("mutate", [extra_field_every_row, extra_field_one_row, missing_field_one_row])
def test_malformed_csv_scores_zero(task_id, mutate):
    assert grade(task_id, mutate) == 0.0


@pytest.mark.parametrize("task_id", CSV_TASKS)
def test_harmless_csv_representation_still_scores_one(task_id):
    assert grade(task_id, requote_all) == 1.0