"""Tests para eda_llm_insights.

NO acceden a red ni a credenciales: _build_prompt y _parse_llm_json son puras y
testeables aisladas; la unica via que llamaria al LLM (eda_llm_insights) se
prueba monkeypatcheando ask_llm con una respuesta simulada.
"""

import json

from datascience.eda_llm_insights import (
    _build_prompt,
    _parse_llm_json,
    eda_llm_insights,
)

# Perfil de ejemplo con la forma que produce profile_table.
_PROFILE = {
    "table": "ventas",
    "n_rows": 1000,
    "columns": [
        {
            "name": "importe",
            "inferred_type": "numeric",
            "semantic_type": "currency",
            "null_pct": 0.0,
            "distinct_count": 950,
            "numeric": {"min": 1.0, "max": 999.0, "mean": 50.5, "p50": 42.0},
            "categorical": None,
        },
        {
            "name": "categoria",
            "inferred_type": "categorical",
            "semantic_type": "",
            "null_pct": 0.05,
            "distinct_count": 3,
            "numeric": None,
            "categorical": {
                "top": [
                    {"value": "neumaticos", "count": 600, "pct": 0.6},
                    {"value": "frenos", "count": 300, "pct": 0.3},
                    {"value": "aceite", "count": 100, "pct": 0.1},
                ],
                "mode": "neumaticos",
            },
        },
    ],
    "correlations": {
        "strong": [
            {"a": "importe", "b": "categoria", "method": "correlation_ratio", "value": 0.72},
        ],
    },
}


def test_build_prompt_includes_table_and_columns():
    prompt = _build_prompt(_PROFILE)
    assert isinstance(prompt, str)
    assert "ventas" in prompt
    assert "importe" in prompt
    assert "categoria" in prompt
    # n_rows presente.
    assert "1000" in prompt


def test_build_prompt_includes_numeric_stats_and_top_values():
    prompt = _build_prompt(_PROFILE)
    # Stats numericas de importe.
    assert "stats[" in prompt
    assert "mean=50.5" in prompt
    # Top valores de categorica.
    assert "neumaticos" in prompt
    # Correlaciones fuertes.
    assert "correlation_ratio" in prompt


def test_build_prompt_handles_empty_profile():
    prompt = _build_prompt({})
    assert isinstance(prompt, str)
    assert "Columnas: 0" in prompt


def test_parse_llm_json_plain():
    payload = {"summary": "una tabla", "dictionary": [], "pii": []}
    text = json.dumps(payload)
    parsed = _parse_llm_json(text)
    assert parsed["summary"] == "una tabla"


def test_parse_llm_json_with_fences():
    payload = {"summary": "con fences", "analyses": ["a1"]}
    text = "```json\n" + json.dumps(payload) + "\n```"
    parsed = _parse_llm_json(text)
    assert parsed["summary"] == "con fences"
    assert parsed["analyses"] == ["a1"]


def test_parse_llm_json_with_surrounding_text():
    payload = {"summary": "rodeado"}
    text = "Aqui tienes el resultado:\n" + json.dumps(payload) + "\nEspero que sirva."
    parsed = _parse_llm_json(text)
    assert parsed["summary"] == "rodeado"


def test_parse_llm_json_nested_braces_in_strings():
    # Un valor string con llaves no debe romper el matching.
    text = '{"summary": "usa {placeholders}", "cleaning": ["fix {x}"]}'
    parsed = _parse_llm_json(text)
    assert parsed["summary"] == "usa {placeholders}"
    assert parsed["cleaning"] == ["fix {x}"]


def test_parse_llm_json_raises_without_object():
    try:
        _parse_llm_json("no hay json aqui")
        assert False, "esperaba ValueError"
    except ValueError:
        pass


def test_eda_llm_insights_ok_with_monkeypatched_llm(monkeypatch):
    """Simula la respuesta del LLM y verifica el shape de salida (sin red)."""
    fake = {
        "summary": "Tabla de ventas",
        "row_meaning": "Una fila = una venta",
        "dictionary": [
            {
                "column": "importe",
                "description": "monto",
                "business_meaning": "ingreso",
                "unit": "EUR",
            }
        ],
        "pii": [],
        "cleaning": ["normalizar categoria"],
        "analyses": ["ventas por categoria"],
    }

    import importlib

    mod = importlib.import_module("datascience.eda_llm_insights")

    monkeypatch.setattr(
        mod, "ask_llm", lambda prompt, model="x", system="", echo=True: json.dumps(fake)
    )

    out = eda_llm_insights(_PROFILE)
    assert out["status"] == "ok"
    llm = out["llm"]
    assert set(llm.keys()) == {
        "summary",
        "row_meaning",
        "dictionary",
        "pii",
        "cleaning",
        "analyses",
    }
    assert llm["summary"] == "Tabla de ventas"
    assert llm["dictionary"][0]["unit"] == "EUR"


def test_eda_llm_insights_fills_missing_keys(monkeypatch):
    """Si el LLM omite claves, se rellenan con defaults vacios."""
    import importlib

    mod = importlib.import_module("datascience.eda_llm_insights")

    monkeypatch.setattr(
        mod,
        "ask_llm",
        lambda prompt, model="x", system="", echo=True: '{"summary": "solo summary"}',
    )

    out = eda_llm_insights(_PROFILE)
    assert out["status"] == "ok"
    llm = out["llm"]
    assert llm["summary"] == "solo summary"
    assert llm["dictionary"] == []
    assert llm["pii"] == []
    assert llm["cleaning"] == []
    assert llm["analyses"] == []
    assert llm["row_meaning"] == ""


def test_eda_llm_insights_error_on_empty_profile():
    out = eda_llm_insights({})
    assert out["status"] == "error"
    assert "profile" in out["error"]


def test_eda_llm_insights_error_on_empty_llm_response(monkeypatch):
    import importlib

    mod = importlib.import_module("datascience.eda_llm_insights")

    monkeypatch.setattr(
        mod, "ask_llm", lambda prompt, model="x", system="", echo=True: ""
    )
    out = eda_llm_insights(_PROFILE)
    assert out["status"] == "error"


def test_eda_llm_insights_error_on_unparseable_llm_response(monkeypatch):
    import importlib

    mod = importlib.import_module("datascience.eda_llm_insights")

    monkeypatch.setattr(
        mod, "ask_llm", lambda prompt, model="x", system="", echo=True: "sin json"
    )
    out = eda_llm_insights(_PROFILE)
    assert out["status"] == "error"