import json
from io import BytesIO
from unittest.mock import patch

import pytest
from openpyxl import load_workbook

from finance.exporting import build_formula_workbook
from finance.formula_columns import validate_column
from finance.formula_views import design_column
from finance.views import APIError

pytestmark = pytest.mark.django_db


def custom_column():
    return {
        "name": "收入成本差",
        "meaning": "实际收入减成本",
        "scope": "按所选分组及本期、基期计算",
        "missing": "结果不可用（#N/A）；零分母不可用",
        "expression": {
            "operator": "subtract",
            "left": {"metric": "revenue"},
            "right": {"metric": "cost"},
        },
    }


def model_response(design):
    return type(
        "Response",
        (),
        {
            "raise_for_status": lambda self: None,
            "json": lambda self: {
                "status": "completed",
                "output": [{"content": [{"type": "output_text", "text": json.dumps(design)}]}],
            },
        },
    )()


def test_design_column_asks_for_missing_details_then_returns_safe_definition(workspace, settings):
    ds, *_ = workspace
    settings.AI_ENABLED = True
    settings.OPENAI_API_KEY = "test-key"
    settings.OPENAI_MODEL = "test-model"
    ctx = {"current": ["2026-08"], "baseline": ["2025-08"], "filters": {}, "group": "department"}
    missing = {"complete": False, "questions": ["请补充缺失值和零分母的处理方式。"], "column": None}
    complete = {"complete": True, "questions": [], "column": custom_column()}
    with patch("finance.formula_views.httpx.Client") as client:
        client.return_value.__enter__.return_value.post.return_value = model_response(missing)
        first = design_column([{"role": "user", "content": "增加收入减成本的新列"}], ds, ctx)
        assert first == missing

        messages = [
            {"role": "user", "content": "增加收入减成本的新列"},
            {"role": "assistant", "content": first["questions"][0]},
            {"role": "user", "content": "缺失或零分母显示不可用"},
        ]
        client.return_value.__enter__.return_value.post.return_value = model_response(complete)
        result = design_column(messages, ds, ctx)

    assert result == complete
    payload = client.return_value.__enter__.return_value.post.call_args.kwargs["json"]
    assert payload["input"][-1] == messages[-1]
    validate_column(result["column"])


def test_design_column_rejects_unsafe_model_definitions(workspace, settings):
    ds, *_ = workspace
    settings.AI_ENABLED = True
    settings.OPENAI_API_KEY = "test-key"
    settings.OPENAI_MODEL = "test-model"
    ctx = {"current": ["2026-08"], "baseline": ["2025-08"], "filters": {}, "group": "department"}
    invalid = {
        "complete": True,
        "questions": [],
        "column": {**custom_column(), "expression": "=HYPERLINK()"},
    }
    with patch("finance.formula_views.httpx.Client") as client:
        client.return_value.__enter__.return_value.post.return_value = model_response(invalid)
        with pytest.raises(APIError, match="未创建工作簿"):
            design_column([{"role": "user", "content": "随意算一个值"}], ds, ctx)


def test_formula_labels_from_ai_are_written_as_plain_text(workspace):
    ds, member, *_ = workspace
    definition = custom_column()
    definition["name"] = '=HYPERLINK("https://invalid")'
    validate_column(definition)
    workbook_bytes = BytesIO()
    build_formula_workbook(
        ds,
        member,
        {
            "start": "2026-08",
            "end": "2026-08",
            "comparison": "yoy",
            "group": "department",
            "custom_columns": [definition],
        },
        workbook_bytes,
    )
    workbook = load_workbook(BytesIO(workbook_bytes.getvalue()), data_only=False)
    summary = workbook["分析汇总"]
    cell = next(cell for row in summary.iter_rows() for cell in row if cell.value == definition["name"])
    assert cell.data_type == "s"