"""Tests para add_xlsx_chart.

Modulos importados por path directo (sin tocar __init__.py). write_xlsx_sheets
escribe los datos; add_xlsx_chart les anade un grafico; reabrimos el libro y
verificamos que ws._charts contiene el chart.
"""

import importlib.util
import os

from openpyxl import load_workbook

_HERE = os.path.dirname(os.path.abspath(__file__))


def _load(name):
    spec = importlib.util.spec_from_file_location(name, os.path.join(_HERE, f"{name}.py"))
    mod = importlib.util.module_from_spec(spec)
    spec.loader.exec_module(mod)
    return mod


add_xlsx_chart = _load("add_xlsx_chart").add_xlsx_chart
write_xlsx_sheets = _load("write_xlsx_sheets").write_xlsx_sheets


def _book_with_data(tmp_path):
    out = str(tmp_path / "chart.xlsx")
    write_xlsx_sheets(
        out,
        {
            "Ventas": [
                ["Mes", "Unidades"],
                ["Ene", 120],
                ["Feb", 150],
                ["Mar", 90],
                ["Abr", 200],
            ],
        },
    )
    return out


def test_add_bar_chart_reabre_y_verifica(tmp_path):
    out = _book_with_data(tmp_path)
    res = add_xlsx_chart(
        xlsx_path=out,
        sheet_name="Ventas",
        chart_type="bar",
        data_range="B1:B5",
        cats_range="A2:A5",
        anchor="D2",
        title="Unidades por mes",
        x_title="Mes",
        y_title="Unidades",
    )
    assert res["status"] == "ok"
    assert res["chart_type"] == "bar"
    assert res["sheet"] == "Ventas"
    assert res["anchor"] == "D2"

    wb = load_workbook(out)
    ws = wb["Ventas"]
    assert len(ws._charts) == 1


def test_add_line_chart(tmp_path):
    out = _book_with_data(tmp_path)
    res = add_xlsx_chart(out, "Ventas", "line", "B1:B5", cats_range="A2:A5")
    assert res["status"] == "ok"
    wb = load_workbook(out)
    assert len(wb["Ventas"]._charts) == 1


def test_add_pie_chart(tmp_path):
    out = _book_with_data(tmp_path)
    res = add_xlsx_chart(out, "Ventas", "pie", "B2:B5", cats_range="A2:A5", anchor="D10")
    assert res["status"] == "ok"
    wb = load_workbook(out)
    assert len(wb["Ventas"]._charts) == 1


def test_add_scatter_chart(tmp_path):
    out = _book_with_data(tmp_path)
    res = add_xlsx_chart(
        out, "Ventas", "scatter", data_range="B2:B5", cats_range="A2:A5"
    )
    assert res["status"] == "ok"
    wb = load_workbook(out)
    assert len(wb["Ventas"]._charts) == 1


def test_dos_charts_en_la_misma_hoja(tmp_path):
    out = _book_with_data(tmp_path)
    assert add_xlsx_chart(out, "Ventas", "bar", "B1:B5", "A2:A5", "D2")["status"] == "ok"
    assert add_xlsx_chart(out, "Ventas", "line", "B1:B5", "A2:A5", "D20")["status"] == "ok"
    wb = load_workbook(out)
    assert len(wb["Ventas"]._charts) == 2


def test_chart_type_invalido_devuelve_error(tmp_path):
    out = _book_with_data(tmp_path)
    res = add_xlsx_chart(out, "Ventas", "donut", "B1:B5")
    assert res["status"] == "error"
    assert "chart_type invalido" in res["error"]


def test_hoja_inexistente_devuelve_error(tmp_path):
    out = _book_with_data(tmp_path)
    res = add_xlsx_chart(out, "Fantasma", "bar", "B1:B5")
    assert res["status"] == "error"
    assert "no existe" in res["error"]


def test_libro_inexistente_devuelve_error():
    res = add_xlsx_chart("/tmp/no_existe_seguro_987654.xlsx", "S", "bar", "B1:B5")
    assert res["status"] == "error"
    assert "no encontrado" in res["error"]


def test_data_range_invalido_devuelve_error(tmp_path):
    out = _book_with_data(tmp_path)
    res = add_xlsx_chart(out, "Ventas", "bar", "rango_basura")
    assert res["status"] == "error"
    assert "data_range invalido" in res["error"]


def test_xlsx_path_vacio_devuelve_error():
    res = add_xlsx_chart("", "S", "bar", "B1:B5")
    assert res["status"] == "error"