"""
ORPO data generation for MATS pipeline (paper §4 / Alg. 1, Alg. 2).

Modes:
  --agent planner       — Alg. 1: K rollouts on BIRD-TRAIN, chosen=correct SQL, rejected=wrong
  --agent validator_sel — Alg. 2 collaborative: validator critique is chosen if FIXER (using it)
                          produces correct SQL, rejected otherwise. Uses previous-iter fixer.
  --agent validator_cond — same as validator_sel but for condition critique
  --agent fixer         — fixer chosen=correct corrected SQL, rejected=wrong

  --mode collab        — use the trained fixer to judge validator outputs (paper §4.3)
  --mode collab_v2     — inference-aligned: critique-says-None ⇒ keep planner SQL; else run fixer.
                          Chosen/rejected by FINAL pipeline SQL correctness. Filters pairs where
                          critique-text actually influenced final outcome.
  --mode independent   — use a heuristic (e.g., string "INCORRECT" in critique when SQL is wrong)
                          to mark chosen/rejected, no fixer involvement. For baseline comparison.

Output: HF dataset with {prompt, chosen, rejected} for ORPO training.
"""
import argparse, os, re, json, random, sqlite3, threading
os.environ.setdefault("PYTHONNOUSERSITE", "1")
os.environ["NO_PROXY"] = "localhost,127.0.0.1"

import requests
from datasets import load_dataset, Dataset, DatasetDict


def safe_exec(db_path, sql, timeout=5):
    r = [None]; e = [None]
    def _run():
        try:
            c = sqlite3.connect(db_path); c.text_factory = lambda b: b.decode(errors="ignore")
            r[0] = c.execute(sql).fetchmany(100); c.close()
        except Exception as ex:
            e[0] = str(ex)
    t = threading.Thread(target=_run, daemon=True); t.start(); t.join(timeout)
    return (None, "TIMEOUT") if t.is_alive() else (r[0], e[0])


def results_match(g, p):
    if g is None or p is None: return False
    def n(rs): return sorted(tuple(str(v).strip().lower() if v is not None else "" for v in r) for r in rs)
    return n(g) == n(p)


def extract_sql(text):
    m = re.search(r"```(?:sql)?\s*(.*?)\s*```", text, re.DOTALL)
    if m:
        s = m.group(1).strip()
        return s[3:].strip() if s.upper().startswith("SQL") else s
    return ""


def qwen_chat(p):
    return f"<|im_start|>user\n{p}<|im_end|>\n<|im_start|>assistant\n"


def llama3_chat(p):
    return (f"<|begin_of_text|><|start_header_id|>user<|end_header_id|>\n\n"
            f"{p}<|eot_id|><|start_header_id|>assistant<|end_header_id|>\n\n")


def vllm_complete(host, model, prompt, n, temperature, top_p, max_tokens, seed, stop=None):
    try:
        r = requests.post(f"{host}/v1/completions", json={
            "model": model, "prompt": prompt,
            "n": n, "temperature": temperature, "top_p": top_p,
            "max_tokens": max_tokens, "seed": seed,
            "stop": stop or ["<|eot_id|>", "<|im_end|>"],
        }, timeout=180)
        r.raise_for_status()
        return [c["text"].strip() for c in r.json()["choices"]]
    except Exception as e:
        return []


def build_planner_data(args, griffith, bird_train):
    """Alg. 1 — planner ORPO data."""
    rows = []
    random.seed(args.seed)
    items = list(griffith.items()); random.shuffle(items)
    n_correct_only = 0; n_wrong_only = 0; n_pairs = 0
    for i, (q_lower, info) in enumerate(items[:args.max_questions if args.max_questions > 0 else len(items)]):
        bt = bird_train[info["sid"]]
        db_path = bt.get("db_path") or f"data/train_databases/{bt['db_id']}/{bt['db_id']}.sqlite"
        if not os.path.exists(db_path): continue
        planning_prompt = info["user_msg"].rstrip() + "\n\nPlanning:"
        chat = qwen_chat(planning_prompt)
        outs = vllm_complete(args.planner_host, "planner", chat,
                             n=args.K, temperature=args.temperature, top_p=0.9,
                             max_tokens=1024, seed=args.seed + i)
        if not outs: continue
        gold_res, _ = safe_exec(db_path, bt["sql"])
        if gold_res is None: continue
        correct, wrong = [], []
        for cot in outs:
            sql = extract_sql(cot)
            if not sql: continue
            pred_res, err = safe_exec(db_path, sql)
            if err or not results_match(gold_res, pred_res):
                wrong.append(cot)
            else:
                correct.append(cot)
        if correct and wrong:
            for c in correct[:2]:
                for w in wrong[:2]:
                    rows.append({"prompt": planning_prompt, "chosen": c, "rejected": w})
                    n_pairs += 1
        elif correct: n_correct_only += 1
        elif wrong: n_wrong_only += 1
        if (i+1) % 200 == 0:
            print(f"  [{i+1}] pairs={n_pairs}, only_c={n_correct_only}, only_w={n_wrong_only}", flush=True)
    return rows


def build_validator_data(args, griffith, bird_train, side):
    """Alg. 2 — collaborative validator ORPO data.
    For each (planner_sql, planner_exec_response):
      generate K validator critiques (sel or cond)
      For each critique: feed to FIXER, check if fixer output is correct.
      Chosen = critique that led to correct fix
      Rejected = critique that led to wrong fix (or no improvement)
    Mode 'independent': mark chosen/rejected by heuristic on SQL correctness alone (no fixer).
    """
    # Paper format: validator prompt uses "Generate feedbacks ... Feedback:" (data_processing/
    # generate_sft_data_for_validator.py) and completion ends with "Conclude: correct/incorrect."
    # The val-sel and val-cond models share this prompt; they differ only by their training
    # completion (SELECT. vs CONDITION. block).
    FIXER_INSTR = ("You are a SQL fixer. Given the question, schema, original SQL query, "
                   "execution response, and the validator's critique below, output ONLY the corrected "
                   "final SQL inside ```sql ... ``` markers.")

    clause_token = "SELECT." if side == "sel" else "CONDITION."

    rows = []
    random.seed(args.seed)
    items = list(griffith.items()); random.shuffle(items)
    n_pairs = 0
    for i, (q_lower, info) in enumerate(items[:args.max_questions if args.max_questions > 0 else len(items)]):
        bt = bird_train[info["sid"]]
        db_path = bt.get("db_path") or f"data/train_databases/{bt['db_id']}/{bt['db_id']}.sqlite"
        if not os.path.exists(db_path): continue

        # Step 1: get a planner SQL (greedy)
        planning_prompt = info["user_msg"].rstrip() + "\n\nPlanning:"
        plans = vllm_complete(args.planner_host, "planner", qwen_chat(planning_prompt),
                              n=1, temperature=0.0, top_p=1.0, max_tokens=1024, seed=args.seed)
        if not plans: continue
        planner_sql = extract_sql(plans[0])
        if not planner_sql: continue

        # Step 2: execute planner SQL
        gold_res, _ = safe_exec(db_path, bt["sql"])
        pred_res, err = safe_exec(db_path, planner_sql)
        if gold_res is None: continue
        planner_correct = (not err) and results_match(gold_res, pred_res)
        exec_response = (f"Error: {err[:200]}" if err
                         else f"OK. Result rows (preview): {str(pred_res)[:300]}")

        # Step 3: generate K validator critiques (paper format)
        schema = info["user_msg"].split("Database Schema:", 1)[1].split("Question:", 1)[0] \
                 if "Database Schema:" in info["user_msg"] else info["user_msg"]
        val_prompt = (f"Generate feedbacks to fix the following SQL query:\n"
                      f"Database Schema:{schema.rstrip()}\n\n"
                      f"Question: {bt['question']}\n"
                      f"External knowledge: {bt.get('evidence','')}\n\n"
                      f"SQL query: {planner_sql}\n\n"
                      f"Execution response:\n{exec_response}\n\n"
                      f"Feedback:")
        # Seed each critique with the clause token so the val-sel/val-cond model continues directly
        seeded_prompt = val_prompt + "\n" + clause_token + "\n"
        critiques = vllm_complete(args.validator_host, "validator", llama3_chat(seeded_prompt),
                                  n=args.K, temperature=args.temperature, top_p=0.9,
                                  max_tokens=384, seed=args.seed + i)
        if not critiques: continue
        # Re-prepend the clause token (vLLM returns only the continuation)
        critiques = [f"{clause_token}\n{c.lstrip()}" for c in critiques]

        chosen, rejected = [], []
        if args.mode == "collab":
            # Use fixer to judge each critique
            for crit in critiques:
                # Build fixer prompt with this critique
                # Wrap paper-format critique in legacy <select>/<condition> tags so the
                # existing wrapper-tag-trained fixer SFT model sees the format it expects.
                wrapped_crit = f"<{'select' if side == 'sel' else 'condition'}>\n{crit}\n</{'select' if side == 'sel' else 'condition'}>"
                fix_prompt = (FIXER_INSTR + "\n\nDatabase Schema:\n" +
                              info["user_msg"].split("Database Schema:")[1].split("Question:")[0].rstrip() +
                              f"\n\nQuestion: {bt['question']}\nExternal knowledge: {bt.get('evidence','None')}\n\n"
                              f"Generated SQL query: {planner_sql}\n\n"
                              f"Execution response:\n{exec_response}\n\n"
                              f"Validator critique:\n{wrapped_crit}\n\n"
                              f"Final SQL:")
                fix_outs = vllm_complete(args.fixer_host, "fixer", llama3_chat(fix_prompt),
                                         n=1, temperature=0.0, top_p=1.0, max_tokens=512,
                                         seed=args.seed + i)
                if not fix_outs: continue
                fix_sql = extract_sql(fix_outs[0])
                if not fix_sql: continue
                fix_res, fix_err = safe_exec(db_path, fix_sql)
                fix_correct = (not fix_err) and results_match(gold_res, fix_res)
                if fix_correct:
                    chosen.append(crit)
                else:
                    rejected.append(crit)
        elif args.mode == "collab_v2":
            # Inference-aligned: Conclude:correct ⇒ keep planner SQL; else run fixer.
            # Chosen/rejected by FINAL pipeline SQL correctness.
            def critique_says_no_fix(crit):
                # Paper format: "Conclude: correct." means no fix needed
                return "Conclude: correct" in crit
            outcomes = []  # (crit, final_correct, says_no_fix)
            for crit in critiques:
                says_no_fix = critique_says_no_fix(crit)
                if says_no_fix:
                    final_sql = planner_sql
                else:
                    fix_prompt = (FIXER_INSTR + "\n\nDatabase Schema:\n" +
                                  info["user_msg"].split("Database Schema:")[1].split("Question:")[0].rstrip() +
                                  f"\n\nQuestion: {bt['question']}\nExternal knowledge: {bt.get('evidence','None')}\n\n"
                                  f"Generated SQL query: {planner_sql}\n\n"
                                  f"Execution response:\n{exec_response}\n\n"
                                  f"Validator critique:\n{crit}\n\n"
                                  f"Final SQL:")
                    fix_outs = vllm_complete(args.fixer_host, "fixer", llama3_chat(fix_prompt),
                                             n=1, temperature=0.0, top_p=1.0, max_tokens=512,
                                             seed=args.seed + i)
                    fix_sql = extract_sql(fix_outs[0]) if fix_outs else ""
                    final_sql = fix_sql if fix_sql else planner_sql
                fres, ferr = safe_exec(db_path, final_sql)
                fcorrect = (not ferr) and results_match(gold_res, fres)
                outcomes.append((crit, fcorrect, says_no_fix))
            # Filter: only keep pairs where critique-text actually influenced outcome.
            # Skip questions where all critiques landed in same bucket OR all say the same thing.
            distinct_says = len(set(o[2] for o in outcomes))
            if distinct_says >= 2:  # at least one None-critique and one fix-critique
                for crit, fcorrect, _ in outcomes:
                    (chosen if fcorrect else rejected).append(crit)
            # Fallback (single-bucket-says, but outcomes differ): still use end-to-end signal
            elif len({o[1] for o in outcomes}) >= 2:
                for crit, fcorrect, _ in outcomes:
                    (chosen if fcorrect else rejected).append(crit)
        else:  # independent mode
            # Paper format: critique should "Conclude: correct" if planner SQL is correct,
            # "Conclude: incorrect" if wrong.
            for crit in critiques:
                says_correct = "Conclude: correct" in crit
                says_incorrect = "Conclude: incorrect" in crit
                if planner_correct and says_correct:
                    chosen.append(crit)
                elif not planner_correct and says_incorrect:
                    chosen.append(crit)
                elif says_correct or says_incorrect:
                    rejected.append(crit)
                # critiques with no conclusion are skipped

        if chosen and rejected:
            for c in chosen[:2]:
                for r in rejected[:2]:
                    rows.append({"prompt": val_prompt, "chosen": c, "rejected": r})
                    n_pairs += 1
        if (i+1) % 100 == 0:
            print(f"  [{i+1}] pairs={n_pairs}", flush=True)
    return rows


def build_fixer_data(args, griffith, bird_train):
    """Fixer ORPO: K fixer outputs, chosen=correct, rejected=wrong."""
    FIXER_INSTR = ("You are a SQL fixer. Given the question, schema, original SQL query, "
                   "execution response, and the validator's critique below, output ONLY the corrected "
                   "final SQL inside ```sql ... ``` markers.")
    rows = []
    random.seed(args.seed)
    items = list(griffith.items()); random.shuffle(items)
    n_pairs = 0
    for i, (q_lower, info) in enumerate(items[:args.max_questions if args.max_questions > 0 else len(items)]):
        bt = bird_train[info["sid"]]
        db_path = bt.get("db_path") or f"data/train_databases/{bt['db_id']}/{bt['db_id']}.sqlite"
        if not os.path.exists(db_path): continue

        # Get planner SQL
        planning_prompt = info["user_msg"].rstrip() + "\n\nPlanning:"
        plans = vllm_complete(args.planner_host, "planner", qwen_chat(planning_prompt),
                              n=1, temperature=0.0, top_p=1.0, max_tokens=1024, seed=args.seed)
        if not plans: continue
        planner_sql = extract_sql(plans[0])
        if not planner_sql: continue

        gold_res, _ = safe_exec(db_path, bt["sql"])
        pred_res, err = safe_exec(db_path, planner_sql)
        if gold_res is None: continue
        if (not err) and results_match(gold_res, pred_res): continue  # planner already correct, skip
        exec_response = (f"Error: {err[:200]}" if err
                         else f"OK. Result rows (preview): {str(pred_res)[:300]}")

        # Get validator critiques
        val_critique = "<select>\nSELECT.\nINCORRECT\n</select>\n\n<condition>\nCONDITION.\nINCORRECT\n</condition>"

        # Build fixer prompt
        fix_prompt = (FIXER_INSTR + "\n\nDatabase Schema:\n" +
                      info["user_msg"].split("Database Schema:")[1].split("Question:")[0].rstrip() +
                      f"\n\nQuestion: {bt['question']}\nExternal knowledge: {bt.get('evidence','None')}\n\n"
                      f"Generated SQL query: {planner_sql}\n\n"
                      f"Execution response:\n{exec_response}\n\n"
                      f"Validator critique:\n{val_critique}\n\n"
                      f"Final SQL:")
        outs = vllm_complete(args.fixer_host, "fixer", llama3_chat(fix_prompt),
                             n=args.K, temperature=args.temperature, top_p=0.9,
                             max_tokens=512, seed=args.seed + i)
        if not outs: continue
        correct, wrong = [], []
        for fix_text in outs:
            fix_sql = extract_sql(fix_text)
            if not fix_sql: continue
            fix_res, fix_err = safe_exec(db_path, fix_sql)
            if (not fix_err) and results_match(gold_res, fix_res):
                correct.append(fix_text)
            else:
                wrong.append(fix_text)
        if correct and wrong:
            for c in correct[:2]:
                for w in wrong[:2]:
                    rows.append({"prompt": fix_prompt, "chosen": c, "rejected": w})
                    n_pairs += 1
        if (i+1) % 200 == 0:
            print(f"  [{i+1}] fixer pairs={n_pairs}", flush=True)
    return rows


def main():
    p = argparse.ArgumentParser()
    p.add_argument("--agent", required=True, choices=["planner", "validator_sel", "validator_cond", "fixer"])
    p.add_argument("--mode", default="collab", choices=["collab", "collab_v2", "independent"])
    p.add_argument("--planner_host", default="http://localhost:8100")
    p.add_argument("--validator_host", default="http://localhost:8101")
    p.add_argument("--fixer_host", default="http://localhost:8102")
    p.add_argument("--K", type=int, default=8)
    p.add_argument("--temperature", type=float, default=1.0)
    p.add_argument("--max_questions", type=int, default=-1)
    p.add_argument("--seed", type=int, default=42)
    p.add_argument("--out", required=True)
    args = p.parse_args()

    print("Loading BIRD-train + griffith prompts...", flush=True)
    with open("data/sft_bird_with_evidence_train_text2sql.json") as f:
        bird_train = json.load(f)
    ds_g = load_dataset("griffith-bigdata/sft_text2sql", split="train_sft",
                        cache_dir="/weka/s225250685/Huggingface/hub").filter(lambda x: x["model_name"]=="deepseek-reasoner")
    griffith = {}
    for row in ds_g:
        sid = int(row["sample_id"])
        if not (0 <= sid < len(bird_train)): continue
        user_msg = row["messages"][1]["content"]
        q_m = re.search(r"Question:\s*(.+?)(?:\n|$)", user_msg)
        if not q_m: continue
        q = q_m.group(1).strip()
        if q.lower() == bird_train[sid]["question"].strip().lower():
            griffith[q.lower()] = {"user_msg": user_msg, "sid": sid}
    print(f"  griffith: {len(griffith)} questions", flush=True)

    if args.agent == "planner":
        rows = build_planner_data(args, griffith, bird_train)
    elif args.agent == "validator_sel":
        rows = build_validator_data(args, griffith, bird_train, "sel")
    elif args.agent == "validator_cond":
        rows = build_validator_data(args, griffith, bird_train, "cond")
    elif args.agent == "fixer":
        rows = build_fixer_data(args, griffith, bird_train)

    print(f"\nGenerated {len(rows)} (chosen, rejected) pairs", flush=True)
    if not rows:
        print("ERROR: no pairs generated"); return

    random.seed(42); random.shuffle(rows)
    n_train = int(0.95 * len(rows))
    DatasetDict({
        "train_dpo": Dataset.from_list(rows[:n_train]),
        "test_dpo": Dataset.from_list(rows[n_train:]),
    }).save_to_disk(args.out)
    print(f"Saved → {args.out}  train={n_train}  test={len(rows)-n_train}", flush=True)


if __name__ == "__main__":
    main()