"""
tests/evaluate.py — Automated evaluation script for the SHL Agent.

Tests all 5 required scenario types:
  1. Vague query → clarification (no recommendations)
  2. Clear query → recommendations (1–10 items)
  3. Changed preference → refined results
  4. Comparison query → grounded explanation
  5. Off-topic → refusal (no recommendations)

Usage:
    # Against local server
    python tests/evaluate.py --base-url http://localhost:7860

    # Against deployed HF Space
    python tests/evaluate.py --base-url https://<your-space>.hf.space

The script prints a pass/fail table and exits with code 1 if any test fails.
This makes it usable in CI/CD pipelines.
"""

import sys
import os
import json
import argparse
import time

import requests


def load_test_cases(path: str) -> list:
    with open(path, "r") as f:
        return json.load(f)


def run_test(base_url: str, test: dict) -> dict:
    """
    Run a single test case against the /chat endpoint.
    Returns a result dict with pass/fail and details.
    """
    url = f"{base_url}/chat"
    payload = {"messages": test["messages"]}

    try:
        resp = requests.post(url, json=payload, timeout=30)
        resp.raise_for_status()
        data = resp.json()
    except requests.exceptions.Timeout:
        return {"scenario": test["scenario"], "passed": False, "reason": "TIMEOUT"}
    except requests.exceptions.RequestException as e:
        return {"scenario": test["scenario"], "passed": False, "reason": str(e)}

    reply = data.get("reply", "")
    recs = data.get("recommendations", [])
    eoc = data.get("end_of_conversation", False)

    failures = []

    # Check: recommendations empty when expected
    if test.get("expected_recommendations_empty") and len(recs) > 0:
        failures.append(f"Expected empty recommendations but got {len(recs)}")

    # Check: recommendations non-empty when expected
    if test.get("expected_recommendations_empty") is False and len(recs) == 0:
        failures.append("Expected non-empty recommendations but got []")

    # Check: end_of_conversation
    if "expected_end_of_conversation" in test:
        if eoc != test["expected_end_of_conversation"]:
            failures.append(
                f"Expected end_of_conversation={test['expected_end_of_conversation']} but got {eoc}"
            )

    # Check: reply is non-empty
    if not reply.strip():
        failures.append("Reply is empty")

    # Check: recommendation count 1–10 if non-empty
    if recs and not (1 <= len(recs) <= 10):
        failures.append(f"Recommendations count {len(recs)} not in [1, 10]")

    # Check: all URLs come from catalog (basic format check)
    for rec in recs:
        if not rec.get("url", "").startswith("https://www.shl.com/"):
            failures.append(f"Suspicious URL: {rec.get('url')}")

    passed = len(failures) == 0
    return {
        "scenario": test["scenario"],
        "passed": passed,
        "reason": "; ".join(failures) if failures else "OK",
        "reply_preview": reply[:100],
        "rec_count": len(recs),
        "eoc": eoc,
    }


def main():
    parser = argparse.ArgumentParser(description="Evaluate SHL Agent")
    parser.add_argument(
        "--base-url",
        default="http://localhost:7860",
        help="Base URL of the running API (default: http://localhost:7860)",
    )
    parser.add_argument(
        "--tests",
        default=os.path.join(os.path.dirname(__file__), "sample_requests.json"),
        help="Path to test cases JSON file",
    )
    args = parser.parse_args()

    # Health check first
    try:
        health_resp = requests.get(f"{args.base_url}/health", timeout=10)
        health_resp.raise_for_status()
        print(f"✓ Health check passed: {health_resp.json()}\n")
    except Exception as e:
        print(f"✗ Health check failed: {e}")
        sys.exit(1)

    test_cases = load_test_cases(args.tests)
    results = []

    for test in test_cases:
        print(f"  Running: {test['scenario']}...", end=" ", flush=True)
        result = run_test(args.base_url, test)
        results.append(result)
        status = "PASS" if result["passed"] else "FAIL"
        print(status)
        if not result["passed"]:
            print(f"    Reason: {result['reason']}")
        else:
            print(f"    Recs: {result['rec_count']} | EOC: {result['eoc']}")
            print(f"    Reply: {result['reply_preview']}...")
        time.sleep(0.5)  # be gentle on rate limits

    passed = sum(1 for r in results if r["passed"])
    total = len(results)
    print(f"\n{'='*50}")
    print(f"Results: {passed}/{total} passed")

    if passed < total:
        print("\nFailed scenarios:")
        for r in results:
            if not r["passed"]:
                print(f"  - {r['scenario']}: {r['reason']}")
        sys.exit(1)
    else:
        print("All tests passed.")
        sys.exit(0)


if __name__ == "__main__":
    main()