"""
run_data_factory.py
====================
Entry point and smoke-test runner for the NL2SQL Data Factory.

Run this FIRST before running the full pipeline to verify:
  1. All 66 SQL templates execute without errors
  2. Rule augmentation produces diverse NL variants
  3. Validators correctly accept/reject queries
  4. Base pipeline generates well-formed JSONL records

Usage:
  # Smoke test only (fast, ~10 seconds)
  python run_data_factory.py --smoke-test

  # Base mode (no GPU, generates all rule-augmented records)
  python run_data_factory.py --mode base

  # Full mode (H100 required)
  python run_data_factory.py --mode full --model meta-llama/Meta-Llama-3-70B-Instruct --tensor-parallel 4

  # Preview what the dataset looks like
  python run_data_factory.py --smoke-test --show-samples 3
"""

from __future__ import annotations

import argparse
import json
import sys
import textwrap
from pathlib import Path

# Allow running from project root
sys.path.insert(0, str(Path(__file__).parent))


# ─────────────────────────────────────────────────────────────────────────────
# SMOKE TEST
# ─────────────────────────────────────────────────────────────────────────────

def run_smoke_test(show_samples: int = 0) -> bool:
    print("\n" + "=" * 60)
    print("  NL2SQL DATA FACTORY — SMOKE TEST")
    print("=" * 60)

    all_passed = True

    # 1. Template validation
    print("\n[1/4] Validating all SQL templates against seeded data...")
    from data_factory.templates import ALL_TEMPLATES, template_stats
    from data_factory.validator import validate_all_templates

    stats  = template_stats()
    result = validate_all_templates(ALL_TEMPLATES)

    print(f"      Templates: {stats}")
    print(f"      Validation: {result['passed']}/{result['total']} passed", end="")

    if result["failed"]:
        print(f"  ← {result['failed']} FAILURES:")
        for f in result["failures"]:
            print(f"        [{f['domain']}] {f['sql']}... → {f['error']}")
        all_passed = False
    else:
        print("  ✓")

    # 2. Rule augmentation
    print("\n[2/4] Testing rule-based augmentation...")
    from data_factory.augmentor import augment_nl

    test_nls = [
        "List all gold-tier customers ordered by name alphabetically. Return id, name, email, country.",
        "Which medications are prescribed most often? Return medication_name, category, times_prescribed.",
        "Rank active employees by salary within their department. Return salary_rank.",
    ]
    for nl in test_nls:
        variants = augment_nl(nl, n=3, seed=42)
        if not variants:
            print(f"      FAIL: No variants generated for: {nl[:50]}")
            all_passed = False
        else:
            print(f"      ✓ {len(variants)} variants from: '{nl[:45]}...'")
            if show_samples > 0:
                for i, v in enumerate(variants[:show_samples]):
                    print(f"          [{i+1}] {v}")

    # 3. Validator accept/reject
    print("\n[3/4] Testing SQL validator accept/reject logic...")
    from data_factory.validator import SQLValidator

    v = SQLValidator("ecommerce")
    tests = [
        ("SELECT id, name FROM customers WHERE tier = 'gold'",    True,  "valid SELECT"),
        ("INSERT INTO customers VALUES (1,'x','x@x.com','IN','gold','2024-01-01')", False, "rejected INSERT"),
        ("SELECT nonexistent_col FROM customers",                  False, "bad column name"),
        ("",                                                       False, "empty string"),
    ]
    for sql, expect_pass, label in tests:
        vr = v.validate(sql)
        status = "✓" if vr.passed == expect_pass else "✗"
        print(f"      {status} {label}: passed={vr.passed}", end="")
        if not vr.passed:
            print(f" (error: {vr.error})", end="")
        print()
        if vr.passed != expect_pass:
            all_passed = False
    v.close()

    # 4. Mini base pipeline (first 5 templates only)
    print("\n[4/4] Running mini base pipeline (first 5 templates)...")
    from data_factory.pipeline import run_base_pipeline

    mini_templates = ALL_TEMPLATES[:5]
    records = run_base_pipeline(mini_templates, n_augmentations=2, seed=42)
    expected_min = 5   # at least canonical NLs
    if len(records) < expected_min:
        print(f"      FAIL: Only {len(records)} records (expected ≥{expected_min})")
        all_passed = False
    else:
        print(f"      ✓ Generated {len(records)} records from 5 templates")

    # Validate structure
    required_keys = {"prompt", "sql", "metadata"}
    for rec in records[:3]:
        missing = required_keys - rec.keys()
        if missing:
            print(f"      FAIL: Record missing keys: {missing}")
            all_passed = False
            break
    else:
        print("      ✓ Record structure validated")

    if show_samples > 0 and records:
        print(f"\n  --- Sample Record ---")
        sample = records[0]
        print(f"  Domain:     {sample['metadata']['domain']}")
        print(f"  Difficulty: {sample['metadata']['difficulty']}")
        print(f"  Persona:    {sample['metadata']['persona']}")
        print(f"  NL:         {sample['prompt'][1]['content'].split('QUESTION: ')[-1][:100]}")
        print(f"  SQL:        {sample['sql'][:80]}...")

    # Summary
    print("\n" + "=" * 60)
    if all_passed:
        print("  ALL SMOKE TESTS PASSED ✓")
        print("  Safe to run: python run_data_factory.py --mode base")
    else:
        print("  SOME TESTS FAILED ✗  — fix errors before running pipeline")
    print("=" * 60 + "\n")

    return all_passed


# ─────────────────────────────────────────────────────────────────────────────
# INSPECT DATASET
# ─────────────────────────────────────────────────────────────────────────────

def inspect_dataset(jsonl_path: str, n: int = 5) -> None:
    """Pretty-print N records from an output JSONL file."""
    path = Path(jsonl_path)
    if not path.exists():
        print(f"File not found: {path}")
        return

    records = []
    with open(path, encoding="utf-8") as f:
        for i, line in enumerate(f):
            if i >= n:
                break
            records.append(json.loads(line))

    print(f"\n{'='*65}")
    print(f"  Showing {len(records)} records from {path.name}")
    print(f"{'='*65}")

    for i, rec in enumerate(records):
        nl = rec["prompt"][1]["content"].split("QUESTION:")[-1].strip()
        sql = rec["sql"]
        meta = rec["metadata"]
        print(f"\n[{i+1}] Domain={meta['domain']} | Difficulty={meta['difficulty']} | "
              f"Persona={meta['persona']} | Source={meta['source']}")
        print(f"  NL:  {textwrap.shorten(nl, 90)}")
        print(f"  SQL: {textwrap.shorten(sql, 90)}")

    print()


# ─────────────────────────────────────────────────────────────────────────────
# MAIN
# ─────────────────────────────────────────────────────────────────────────────

def main() -> None:
    parser = argparse.ArgumentParser(
        description="NL2SQL Data Factory — entry point.",
        formatter_class=argparse.RawTextHelpFormatter,
    )
    parser.add_argument(
        "--smoke-test", action="store_true",
        help="Run smoke test only (validates all templates, no output written).",
    )
    parser.add_argument(
        "--show-samples", type=int, default=0,
        help="During smoke test, show N sample NL variants and records.",
    )
    parser.add_argument(
        "--inspect", type=str, default=None,
        help="Path to a JSONL output file to inspect.",
    )
    parser.add_argument(
        "--inspect-n", type=int, default=5,
        help="Number of records to show when inspecting.",
    )
    parser.add_argument(
        "--mode", choices=["base", "full"], default="base",
        help=(
            "base: rule augmentation only, ~450 records, no GPU needed.\n"
            "full: + vLLM persona variants, 500K+ records, H100 required."
        ),
    )
    parser.add_argument("--model", default="meta-llama/Meta-Llama-3-70B-Instruct")
    parser.add_argument("--tensor-parallel", type=int, default=4)
    parser.add_argument("--n-rule-augments", type=int, default=5)
    parser.add_argument("--n-persona-variants", type=int, default=10)
    parser.add_argument("--batch-size", type=int, default=64)
    parser.add_argument("--temperature", type=float, default=0.85)
    parser.add_argument("--output-dir", default="generated_data/output")
    parser.add_argument("--checkpoint-dir", default="generated_data/checkpoints")
    parser.add_argument("--seed", type=int, default=42)
    parser.add_argument("--no-parquet", action="store_true")
    parser.add_argument("--resume", action="store_true")
    parser.add_argument(
        "--domains", nargs="+",
        choices=["ecommerce","healthcare","finance","hr"],
        default=["ecommerce","healthcare","finance","hr"],
    )
    parser.add_argument(
        "--difficulties", nargs="+",
        choices=["easy","medium","hard"],
        default=["easy","medium","hard"],
    )

    args = parser.parse_args()

    if args.smoke_test:
        ok = run_smoke_test(show_samples=args.show_samples)
        sys.exit(0 if ok else 1)

    if args.inspect:
        inspect_dataset(args.inspect, n=args.inspect_n)
        sys.exit(0)

    # Forward to pipeline
    from data_factory.pipeline import main as pipeline_main
    # Re-parse with pipeline's own parser by forwarding sys.argv
    pipeline_main()


if __name__ == "__main__":
    main()