import tempfile
from pathlib import Path

import pandas as pd

from app.parsers.base import get_parser, match_column
from app.parsers.excel_parser import ExcelParser
from app.parsers.models import MeasurementRecord


def test_match_column_nominal():
    assert match_column("Nominal") == "nominal"
    assert match_column("NOM") == "nominal"
    assert match_column("Target Value") == "nominal"


def test_match_column_actual():
    assert match_column("Actual") == "actual"
    assert match_column("Measured") == "actual"


def test_match_column_unknown():
    assert match_column("random_xyz") is None


def test_get_parser_pdf():
    p = get_parser("report.pdf")
    from app.parsers.pdf_parser import PDFParser
    assert isinstance(p, PDFParser)


def test_get_parser_excel():
    p = get_parser("data.xlsx")
    assert isinstance(p, ExcelParser)


def test_get_parser_csv():
    p = get_parser("data.csv")
    assert isinstance(p, ExcelParser)


def test_get_parser_unsupported():
    try:
        get_parser("image.png")
        assert False, "Should have raised"
    except ValueError:
        pass


def test_measurement_record_properties():
    rec = MeasurementRecord(
        feature_name="D1",
        nominal=10.0,
        tolerance_plus=0.05,
        tolerance_minus=-0.05,
        actual=10.02,
    )
    assert rec.usl == 10.05
    assert rec.lsl == 9.95
    assert rec.in_tolerance is True


def test_measurement_record_out_of_tolerance():
    rec = MeasurementRecord(
        feature_name="D1",
        nominal=10.0,
        tolerance_plus=0.05,
        tolerance_minus=-0.05,
        actual=10.10,
    )
    assert rec.in_tolerance is False


def test_excel_parser_with_standard_headers():
    df = pd.DataFrame({
        "Feature Name": ["D1", "D2", "D3"],
        "Nominal": [10.0, 20.0, 30.0],
        "Actual": [10.02, 19.98, 30.05],
        "Tol+": [0.05, 0.10, 0.10],
        "Tol-": [-0.05, -0.10, -0.10],
    })
    with tempfile.NamedTemporaryFile(suffix=".xlsx", delete=False) as f:
        df.to_excel(f.name, index=False)
        parser = ExcelParser()
        report = parser.parse(Path(f.name))

    assert len(report.measurements) == 3
    assert report.measurements[0].feature_name == "D1"
    assert report.measurements[0].nominal == 10.0
    assert report.measurements[0].actual == 10.02