"""
Integration test for AgLLM models.

Tests each model by calling initialize_qa_chain() from app.py directly,
exercising the same code path as the Gradio UI.

Usage:
    python test_app_models.py                        # Test all models
    python test_app_models.py --model "GPT-4"        # Test a single model
    python test_app_models.py --model "Gemini-2.5 Pro"

Exit code 0 = all tested models passed, 1 = any failure.
Models with missing API keys are skipped (not failures).
"""

import os
import sys
import json
import time
import argparse

# Ensure working directory is project root (app.py uses relative paths)
os.chdir(os.path.dirname(os.path.abspath(__file__)))

# Load .env before anything else
from dotenv import load_dotenv
load_dotenv()

# Which API key each model needs
REQUIRED_KEYS = {
    "GPT-4": "OPENAI_API_KEY",
    "GPT-4.1 Mini": "OPENAI_API_KEY",
    "Llama-4 Maverick": "OPENROUTER_API_KEY",
    "Llama-4 Scout": "OPENROUTER_API_KEY",
    "Gemini-2.5 Pro": "OPENROUTER_API_KEY",
    "Claude Opus 4.6": "ANTHROPIC_API_KEY",
    "Claude Sonnet 4.6": "ANTHROPIC_API_KEY",
}

TEST_QUESTION = "What is the common name of {species}? Answer briefly."


def get_active_models(app_module):
    """Extract model labels from initialize_qa_chain's if/elif branches."""
    import inspect
    source = inspect.getsource(app_module.initialize_qa_chain)
    models = []
    for line in source.splitlines():
        line = line.strip()
        if line.startswith('if model_name==') or line.startswith('elif model_name=='):
            label = line.split('==')[1].strip().rstrip(':').strip('"').strip("'")
            models.append(label)
    return models


def test_model(app_module, model_label, species):
    """Test a model through the RAG path."""
    qa_chain, availability_msg = app_module.initialize_qa_chain(
        specie_selector=species,
        application_mode="Researcher",
        model_name=model_label,
        region="Midwest USA",
    )
    question = TEST_QUESTION.format(species=species)
    result = qa_chain({"question": question, "chat_history": []})
    answer = result["answer"]
    if not answer or len(answer.strip()) == 0:
        raise ValueError("Empty response from RAG chain")
    return answer.strip()


def run_single_test(app_module, model_label, species):
    """Run a single test. Returns a result dict."""
    required_key = REQUIRED_KEYS.get(model_label)
    if required_key and not os.getenv(required_key):
        return {
            "model": model_label,
            "status": "SKIP",
            "reason": f"Missing {required_key}",
        }

    start = time.time()
    try:
        response = test_model(app_module, model_label, species)
        elapsed = time.time() - start
        return {
            "model": model_label,
            "status": "PASS",
            "response": response[:200],
            "latency_seconds": round(elapsed, 2),
        }
    except Exception as e:
        elapsed = time.time() - start
        return {
            "model": model_label,
            "status": "FAIL",
            "error": str(e)[:300],
            "latency_seconds": round(elapsed, 2),
        }


def print_result(r):
    status = r["status"]
    label = r["model"]
    if status == "PASS":
        preview = r["response"][:80].replace("\n", " ")
        print(f"  PASS  {label:25s}  ({r['latency_seconds']:.1f}s)  \"{preview}\"")
    elif status == "SKIP":
        print(f"  SKIP  {label:25s}  {r['reason']}")
    else:
        print(f"  FAIL  {label:25s}  ({r['latency_seconds']:.1f}s)  {r['error'][:100]}")


def main():
    parser = argparse.ArgumentParser(description="AgLLM integration test")
    parser.add_argument("--model", type=str, help="Test a single model by label")
    args = parser.parse_args()

    # Pre-flight check
    if not os.getenv("OPENAI_API_KEY"):
        print("FATAL: OPENAI_API_KEY is required (used for embeddings). Set it and retry.")
        sys.exit(1)

    print("\n  Loading app.py (vector DBs, embeddings, data files)...")
    import app as app_module
    print("  App loaded successfully.\n")

    # Use first species in the DB for testing
    species = app_module.species_list[0]

    # Determine which models to test
    if args.model:
        models_to_test = [args.model]
    else:
        models_to_test = get_active_models(app_module)

    print(f"{'='*75}")
    print(f"  AgLLM Integration Test")
    print(f"  Species: {species}")
    print(f"  Models:  {', '.join(models_to_test)}")
    print(f"{'='*75}\n")

    results = []
    tested = 0
    passed = 0
    skipped = 0
    failed = 0

    for model_label in models_to_test:
        r = run_single_test(app_module, model_label, species)
        results.append(r)
        print_result(r)

        if r["status"] == "PASS":
            tested += 1
            passed += 1
        elif r["status"] == "SKIP":
            skipped += 1
        else:
            tested += 1
            failed += 1

    print(f"\n{'='*75}")
    print(f"  Results: {passed}/{tested} passed, {failed} failed, {skipped} skipped")
    print(f"{'='*75}\n")

    # Write JSON results
    output = {
        "timestamp": time.strftime("%Y-%m-%dT%H:%M:%S"),
        "species_tested": species,
        "tested": tested,
        "passed": passed,
        "failed": failed,
        "skipped": skipped,
        "results": results,
    }
    output_file = "test_app_models_results.json"
    with open(output_file, "w") as f:
        json.dump(output, f, indent=2)
    print(f"  Results written to {output_file}\n")

    sys.exit(0 if failed == 0 and tested > 0 else 1)


if __name__ == "__main__":
    main()