"""Tests for extraction model performance metrics collection.

Validates that collect_metrics correctly computes metrics from
ExtractionResponse objects for both successful and failed extractions.

Requirements: 5.2, 5.4, 12.1, 12.2
"""
from __future__ import annotations

from services.extractor.client import ExtractionAttempt, ExtractionResponse
from services.extractor.metrics import collect_metrics
from services.extractor.schemas import ExtractionResult, ValidationReport


def _make_valid_result() -> ExtractionResult:
    return ExtractionResult.model_validate({
        "summary": "Apple beat earnings expectations.",
        "companies": [
            {
                "ticker": "AAPL",
                "company_name": "Apple Inc.",
                "relevance": 0.95,
                "sentiment": "positive",
                "impact_score": 0.7,
                "impact_horizon": "1d_30d",
                "catalyst_type": "earnings",
                "key_facts": ["Revenue up 12%"],
                "risks": [],
                "evidence_spans": ["Apple beat expectations"],
            }
        ],
        "macro_themes": ["ai_capex"],
        "novelty_score": 0.6,
        "confidence": 0.85,
        "extraction_warnings": [],
    })


def _make_success_response() -> ExtractionResponse:
    result = _make_valid_result()
    validation = ValidationReport(valid=True, errors=[], warnings=["low_novelty"], parsed=result)
    attempt = ExtractionAttempt(
        raw_output=result.model_dump_json(),
        validation=validation,
        error=None,
        duration_ms=500,
        model="test-model",
    )
    return ExtractionResponse(
        success=True,
        result=result,
        attempts=[attempt],
        prompt_metadata={"prompt_version": "document-intel-v1", "schema_version": "2.0.0"},
        model="test-model",
        total_duration_ms=500,
    )


def _make_failed_response_with_retries() -> ExtractionResponse:
    attempt1 = ExtractionAttempt(
        raw_output="bad json",
        validation=None,
        error="invalid_json",
        duration_ms=200,
        model="test-model",
    )
    attempt2 = ExtractionAttempt(
        raw_output="still bad output here",
        validation=ValidationReport(
            valid=False,
            errors=["schema_fail", "missing_companies"],
            warnings=["truncated"],
        ),
        error="schema_fail; missing_companies",
        duration_ms=300,
        model="test-model",
    )
    return ExtractionResponse(
        success=False,
        result=None,
        attempts=[attempt1, attempt2],
        prompt_metadata={"prompt_version": "document-intel-v1", "schema_version": "2.0.0"},
        model="test-model",
        total_duration_ms=500,
    )


def test_collect_metrics_success():
    """Successful extraction produces correct metrics."""
    resp = _make_success_response()
    m = collect_metrics(
        resp,
        document_id="doc-1",
        ticker="AAPL",
        document_text_length=4000,
    )

    assert m.document_id == "doc-1"
    assert m.ticker == "AAPL"
    assert m.model_name == "test-model"
    assert m.prompt_version == "document-intel-v1"
    assert m.schema_version == "2.0.0"
    assert m.success is True
    assert m.attempt_count == 1
    assert m.total_duration_ms == 500
    assert m.first_attempt_duration_ms == 500
    assert m.final_attempt_duration_ms == 500
    assert m.confidence == 0.85
    assert m.validation_status == "valid"
    assert m.validation_error_count == 0
    assert m.validation_warning_count == 1
    assert m.retry_count == 0
    assert m.input_token_estimate == 1000  # 4000 / 4
    assert m.output_token_estimate > 0
    assert m.company_count == 1


def test_collect_metrics_failed_with_retries():
    """Failed extraction with retries produces correct metrics."""
    resp = _make_failed_response_with_retries()
    m = collect_metrics(
        resp,
        document_id="doc-2",
        ticker="MSFT",
        document_text_length=2000,
    )

    assert m.success is False
    assert m.attempt_count == 2
    assert m.retry_count == 1
    assert m.first_attempt_duration_ms == 200
    assert m.final_attempt_duration_ms == 300
    assert m.total_duration_ms == 500
    assert m.validation_status == "failed"
    assert m.validation_error_count == 2
    assert m.validation_warning_count == 1
    assert "schema_fail" in m.validation_errors
    assert m.confidence == 0.0
    assert m.company_count == 0
    assert m.input_token_estimate == 500  # 2000 / 4


def test_collect_metrics_empty_attempts():
    """Response with no attempts produces safe defaults."""
    resp = ExtractionResponse(
        success=False,
        result=None,
        attempts=[],
        prompt_metadata={},
        model="test-model",
        total_duration_ms=0,
    )
    m = collect_metrics(resp, document_id="doc-3")

    assert m.attempt_count == 0
    assert m.retry_count == 0
    assert m.first_attempt_duration_ms == 0
    assert m.final_attempt_duration_ms == 0
    assert m.validation_status == "unknown"
    assert m.confidence == 0.0


def test_collect_metrics_no_document_text_length():
    """Zero document text length produces zero token estimate."""
    resp = _make_success_response()
    m = collect_metrics(resp, document_text_length=0)

    assert m.input_token_estimate == 0