"""
Pipeline rollout driver for the 3-stage collaborative-ORPO experiment.

Three-stage pipeline:
    q  →  PLANNER (Qwen-Coder-0.5B SFT'd)         →  plan + first-cut SQL
       →  VALIDATOR (Qwen-Coder-0.5B SFT'd)        →  free-form critique (4 sections)
       →  FIXER (Qwen-Coder-0.5B SFT'd)            →  final SQL

For each input question we sample K planner outputs with stochastic decoding,
then for each planner output we sample K_val validator outputs, and for each
(planner, validator) we sample K_fix fixer outputs. Each leaf trajectory is
graded by execution of the fixer's final SQL.

The output JSONL is consumed by build_rl_data_collaborative.py to construct
preference pairs (planner-indep / planner-collab / validator-collab / fixer).

Usage:
    # Three vLLM endpoints, e.g.
    #   GPU 0:8100 = planner
    #   GPU 1:8101 = validator
    #   GPU 1:8102 = fixer    (can co-locate validator+fixer on one GPU since both 0.5B)
    python scripts/run_pipeline_rollouts.py \\
        --input_file data/sft_bird_with_evidence_train_text2sql.json \\
        --output_file data/rollouts/bird_train_3stage_K4.jsonl \\
        --planner_host http://localhost:8100 \\
        --validator_host http://localhost:8101 \\
        --fixer_host http://localhost:8102 \\
        --K 4 --K_val 2 --K_fix 1 \\
        --temperature 0.7 --top_p 0.9 \\
        --max_questions 1000
"""

import argparse
import json
import os
import re
import sys
import time
from concurrent.futures import ThreadPoolExecutor

# Bypass HTTP proxy for local vLLM endpoints
os.environ["NO_PROXY"] = "localhost,127.0.0.1"
os.environ["no_proxy"] = "localhost,127.0.0.1"

import requests
from tqdm import tqdm

ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
os.chdir(ROOT)
sys.path.insert(0, ROOT)

from validator_data.validator import _execute_sql
from data_processing.planner import is_execution_correct


PLANNER_PROMPT_TEMPLATE = (
    "{schema}\n\n"
    "Question: {question}\n"
    "External knowledge: {evidence}\n\n"
    "Planning:"
)

# Validator prompt — must match what the validator was SFT'd to expect.
VALIDATOR_PROMPT_HEADER = (
    "You are a SQL critique agent. Output FOUR critique sections "
    "(<select>...</select>, <condition>...</condition>, <join>...</join>, <order>...</order>) "
    "analysing the SQL query below; do NOT output any SQL.\n\n"
)

# Specialized 2-validator headers (match SFT data built in build_validator_2agents_v3.py).
VALIDATOR_SEL_HEADER = (
    "You are a SQL SELECT-clause critique agent. Output ONE critique section "
    "<select>...</select> analysing the SELECT clause of the SQL query below; "
    "do NOT output any SQL. Use 'None' if the SELECT clause looks correct.\n\n"
)
VALIDATOR_COND_HEADER = (
    "You are a SQL CONDITION critique agent. Output ONE critique section "
    "<condition>...</condition> analysing the WHERE/HAVING/CASE-WHEN conditions "
    "of the SQL query below; do NOT output any SQL. Use 'None' if the conditions "
    "look correct.\n\n"
)

VALIDATOR_PROMPT_BODY = (
    "database schema:\n{schema}\n\n"
    "Question: {question}\n"
    "External knowledge: {evidence}\n\n"
    "Generated SQL query: {sql_query}\n\n"
    "Execution response:\n{execution_response}\n\n"
)

# Fixer prompt — must match what the fixer was SFT'd to expect.
FIXER_PROMPT_HEADER = (
    "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.\n\n"
)


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


def vllm_complete(host, model, prompt, n, temperature, top_p, max_tokens, seed=100):
    payload = {
        "model": model,
        "prompt": prompt,
        "max_tokens": max_tokens,
        "n": n,
        "temperature": temperature,
        "top_p": top_p,
        "stop": ["<|im_end|>", "<|endoftext|>"],
        "seed": seed,
    }
    for attempt in range(3):
        try:
            r = requests.post(f"{host}/v1/completions", json=payload, timeout=120)
            r.raise_for_status()
            return [c["text"] for c in r.json()["choices"]]
        except Exception as e:
            if attempt == 2:
                print(f"vLLM call failed: {e}", file=sys.stderr)
                return []
            time.sleep(1)
    return []


def extract_sql_from_planner(text):
    if text is None:
        return ""
    m = re.search(r"Final SQL query:\s*```(.+?)```", text, re.DOTALL)
    if m:
        s = m.group(1).strip()
    else:
        m = re.search(r"```(.+?)```", text, re.DOTALL)
        if m:
            s = m.group(1).strip()
        else:
            return text.strip()
    if s.startswith("sql"):
        s = s[3:].strip()
    return s


def extract_sql_from_fixer(text):
    if text is None:
        return ""
    m = re.search(r"```sql\s*\n?(.+?)```", text, re.DOTALL | re.IGNORECASE)
    if m:
        return m.group(1).strip()
    m = re.search(r"```(.+?)```", text, re.DOTALL)
    if m:
        s = m.group(1).strip()
        if s.lower().startswith("sql"):
            s = s[3:].strip()
        return s
    return text.strip().strip("`").strip()


def parse_validator_sections(text):
    sections = {"select": "", "condition": "", "join": "", "order": ""}
    for tag in sections:
        m = re.search(fr"<{tag}>(.*?)</{tag}>", text, re.DOTALL | re.IGNORECASE)
        if m:
            sections[tag] = m.group(1).strip()
    return sections


def safe_execute(db_path, sql):
    if not sql or sql.strip() == "":
        return ("", True)
    try:
        return _execute_sql("./" + db_path, sql)
    except Exception as e:
        return (str(e), True)


def build_planner_prompt(sample):
    return PLANNER_PROMPT_TEMPLATE.format(
        schema=sample.get("schema_sequence") or sample.get("schema") or "",
        question=sample.get("question", ""),
        evidence=sample.get("evidence", "") or "None",
    )


def build_validator_prompt(sample, planner_sql, exec_response):
    body = VALIDATOR_PROMPT_BODY.format(
        schema=sample.get("schema_sequence") or sample.get("schema") or "",
        question=sample.get("question", ""),
        evidence=sample.get("evidence", "") or "None",
        sql_query=planner_sql,
        execution_response=exec_response,
    )
    return VALIDATOR_PROMPT_HEADER + body


def build_validator_sel_prompt(sample, planner_sql, exec_response):
    body = VALIDATOR_PROMPT_BODY.format(
        schema=sample.get("schema_sequence") or sample.get("schema") or "",
        question=sample.get("question", ""),
        evidence=sample.get("evidence", "") or "None",
        sql_query=planner_sql,
        execution_response=exec_response,
    )
    return VALIDATOR_SEL_HEADER + body


def build_validator_cond_prompt(sample, planner_sql, exec_response):
    body = VALIDATOR_PROMPT_BODY.format(
        schema=sample.get("schema_sequence") or sample.get("schema") or "",
        question=sample.get("question", ""),
        evidence=sample.get("evidence", "") or "None",
        sql_query=planner_sql,
        execution_response=exec_response,
    )
    return VALIDATOR_COND_HEADER + body


def build_fixer_prompt(sample, planner_sql, exec_response, critique):
    body = (
        f"database schema:\n{sample.get('schema_sequence') or sample.get('schema') or ''}\n\n"
        f"Question: {sample.get('question', '')}\n"
        f"External knowledge: {sample.get('evidence','') or 'None'}\n\n"
        f"Generated SQL query: {planner_sql}\n\n"
        f"Execution response:\n{exec_response}\n\n"
    )
    return FIXER_PROMPT_HEADER + body + "\n\nValidator critique:\n" + critique + "\n\nFinal SQL:"


def process_sample(sample, args):
    db_path = sample["db_path"]
    gold_sql = sample["sql"]
    true_exec = safe_execute(db_path, gold_sql)
    if true_exec[1]:
        return None  # gold has error; skip

    # Stage 1: planner — K samples (optionally split across temperatures via --mixed_temp)
    planner_prompt_raw = build_planner_prompt(sample)
    planner_chat = qwen_chat(planner_prompt_raw)
    if getattr(args, "mixed_temp", "").strip():
        temps = [float(x) for x in args.mixed_temp.split(",") if x.strip()]
        # distribute args.K samples across temperatures
        per_temp = max(1, args.K // len(temps))
        remainder = args.K - per_temp * len(temps)
        planner_outputs = []
        for i, t in enumerate(temps):
            n_t = per_temp + (1 if i < remainder else 0)
            if n_t <= 0:
                continue
            outs = vllm_complete(
                args.planner_host, "planner", planner_chat,
                n=n_t, temperature=t, top_p=args.top_p,
                max_tokens=args.max_planner_tokens, seed=args.seed + i * 31,
            )
            planner_outputs.extend(outs)
    else:
        planner_outputs = vllm_complete(
            args.planner_host, "planner", planner_chat,
            n=args.K, temperature=args.temperature, top_p=args.top_p,
            max_tokens=args.max_planner_tokens, seed=args.seed,
        )
    if not planner_outputs:
        return None

    trajectories = []
    for plan in planner_outputs:
        planner_sql = extract_sql_from_planner(plan)
        if not planner_sql:
            continue
        planner_exec = safe_execute(db_path, planner_sql)
        exec_response = (
            f"Error: {planner_exec[0]}" if planner_exec[1]
            else f"OK. Result rows (preview): {str(planner_exec[0])[:300]}"
        )

        # Stage 2: validator — K_val samples per planner output (or skip if validator_host empty)
        # Three modes:
        # (a) Two specialized validators: --validator_sel_host + --validator_cond_host (per-paper design)
        # (b) Legacy unified validator:    --validator_host (single 4-section model)
        # (c) None: insert all-OK placeholder
        v_sel = getattr(args, "validator_sel_host", "") or ""
        v_cond = getattr(args, "validator_cond_host", "") or ""
        if v_sel and v_sel.lower() != "none" and v_cond and v_cond.lower() != "none":
            sel_prompt = build_validator_sel_prompt(sample, planner_sql, exec_response)
            cond_prompt = build_validator_cond_prompt(sample, planner_sql, exec_response)
            sel_outputs = vllm_complete(
                v_sel, "validator_sel", qwen_chat(sel_prompt),
                n=args.K_val, temperature=args.temperature, top_p=args.top_p,
                max_tokens=args.max_validator_tokens, seed=args.seed,
            )
            cond_outputs = vllm_complete(
                v_cond, "validator_cond", qwen_chat(cond_prompt),
                n=args.K_val, temperature=args.temperature, top_p=args.top_p,
                max_tokens=args.max_validator_tokens, seed=args.seed + 1,
            )
            # Pair selection+condition outputs index-wise, padding with "None" if one ran short.
            validator_outputs = []
            for i in range(args.K_val):
                s_out = sel_outputs[i] if i < len(sel_outputs) else "<select>\nSELECT.\nNone\n</select>"
                c_out = cond_outputs[i] if i < len(cond_outputs) else "<condition>\nCONDITION.\nNone\n</condition>"
                combined = (
                    s_out.strip() + "\n\n" +
                    c_out.strip() + "\n\n" +
                    "<join>\nJOIN.\nNone\n</join>\n\n"
                    "<order>\nORDER BY.\nNone\n</order>"
                )
                validator_outputs.append(combined)
            validator_prompt_raw = sel_prompt + "\n\n[+]\n\n" + cond_prompt  # for logging
        elif args.validator_host and args.validator_host.lower() != "none":
            validator_prompt_raw = build_validator_prompt(sample, planner_sql, exec_response)
            validator_chat = qwen_chat(validator_prompt_raw)
            validator_outputs = vllm_complete(
                args.validator_host, "validator", validator_chat,
                n=args.K_val, temperature=args.temperature, top_p=args.top_p,
                max_tokens=args.max_validator_tokens, seed=args.seed,
            )
        else:
            validator_prompt_raw = build_validator_prompt(sample, planner_sql, exec_response)
            validator_outputs = [
                "<select>\nSELECT.\nNone\n</select>\n\n"
                "<condition>\nCONDITION.\nNone\n</condition>\n\n"
                "<join>\nJOIN.\nNone\n</join>\n\n"
                "<order>\nORDER BY.\nNone\n</order>"
            ] * args.K_val

        for val_out in validator_outputs:
            sections = parse_validator_sections(val_out)
            critique_text = val_out.strip()  # full critique as the validator's "completion"

            # Stage 3: fixer — K_fix samples (skip when fixer_host=none → keep planner_sql)
            fixer_prompt_raw = build_fixer_prompt(sample, planner_sql, exec_response, critique_text)
            if args.fixer_host and args.fixer_host.lower() != "none":
                fixer_chat = qwen_chat(fixer_prompt_raw)
                fixer_outputs = vllm_complete(
                    args.fixer_host, "fixer", fixer_chat,
                    n=args.K_fix, temperature=args.temperature, top_p=args.top_p,
                    max_tokens=args.max_fixer_tokens, seed=args.seed,
                )
            else:
                fixer_outputs = [""] * args.K_fix  # empty → fixed_sql will fallback to planner_sql

            for fix_out in fixer_outputs:
                fixed_sql = extract_sql_from_fixer(fix_out) or planner_sql
                trajectories.append({
                    "planner_prompt": planner_prompt_raw,
                    "planner_output": plan,
                    "planner_sql": planner_sql,
                    "planner_exec_ok": not planner_exec[1],
                    "validator_prompt": validator_prompt_raw,
                    "validator_output": critique_text,
                    "fb_select": sections["select"],
                    "fb_condition": sections["condition"],
                    "fb_join": sections["join"],
                    "fb_order": sections["order"],
                    "fixer_prompt": fixer_prompt_raw,
                    "fixer_output": fix_out,
                    "fixed_sql": fixed_sql,
                })

    if not trajectories:
        return None

    # Grade each trajectory
    with ThreadPoolExecutor(max_workers=8) as exe:
        planner_execs = list(exe.map(
            lambda t: safe_execute(db_path, t["planner_sql"]), trajectories
        ))
        fixed_execs = list(exe.map(
            lambda t: safe_execute(db_path, t["fixed_sql"]), trajectories
        ))

    for i, t in enumerate(trajectories):
        pe, fe = planner_execs[i], fixed_execs[i]
        t["is_planner_correct"] = (
            (not pe[1]) and is_execution_correct(true_exec[0], pe[0])
        )
        t["is_fixed_correct"] = (
            (not fe[1]) and is_execution_correct(true_exec[0], fe[0])
        )

    return {
        "question": sample["question"],
        "evidence": sample.get("evidence", ""),
        "db_path": db_path,
        "db_id": sample.get("db_id", ""),
        "schema": sample.get("schema_sequence") or sample.get("schema") or "",
        "sql": gold_sql,
        "trajectories": trajectories,
    }


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument("--input_file", required=True)
    parser.add_argument("--output_file", required=True)
    parser.add_argument("--planner_host", default="http://localhost:8100")
    parser.add_argument("--validator_host", default="http://localhost:8101",
                        help="Single unified validator host (legacy 4-section). "
                             "Ignored when --validator_sel_host AND --validator_cond_host are set.")
    parser.add_argument("--validator_sel_host", default="",
                        help="Specialized SELECT-clause validator host (paper v_s). "
                             "When both this and --validator_cond_host are set, the unified validator is bypassed.")
    parser.add_argument("--validator_cond_host", default="",
                        help="Specialized CONDITION validator host (paper v_c).")
    parser.add_argument("--fixer_host", default="http://localhost:8102")
    parser.add_argument("--K", type=int, default=4, help="planner samples per question")
    parser.add_argument("--K_val", type=int, default=2, help="validator samples per planner output")
    parser.add_argument("--K_fix", type=int, default=1, help="fixer samples per (planner, validator)")
    parser.add_argument("--temperature", type=float, default=0.7)
    parser.add_argument("--top_p", type=float, default=0.9)
    parser.add_argument("--seed", type=int, default=100)
    parser.add_argument("--max_planner_tokens", type=int, default=1024)
    parser.add_argument("--max_validator_tokens", type=int, default=512)
    parser.add_argument("--max_fixer_tokens", type=int, default=512)
    parser.add_argument("--max_questions", type=int, default=-1)
    parser.add_argument("--n_threads", type=int, default=8)
    parser.add_argument("--mixed_temp", type=str, default="",
                        help="Comma-separated temperatures to mix across K planner samples (e.g. '0.5,0.7,0.9,1.1'). "
                             "If set, args.temperature is ignored for the planner stage. Used to boost pass@K diversity.")
    args = parser.parse_args()

    print(f"Loading {args.input_file}...")
    with open(args.input_file) as f:
        data = json.load(f)
    if args.max_questions > 0:
        data = data[: args.max_questions]
    print(f"  {len(data)} questions")

    os.makedirs(os.path.dirname(args.output_file), exist_ok=True)

    seen = set()
    if os.path.exists(args.output_file):
        with open(args.output_file) as f:
            for line in f:
                try:
                    d = json.loads(line)
                    seen.add((d["question"], d.get("db_id", "")))
                except Exception:
                    pass
        print(f"  resuming: skip {len(seen)} already-processed")

    todo = [s for s in data if (s["question"], s.get("db_id", "")) not in seen]
    print(f"  to process: {len(todo)}")

    fout = open(args.output_file, "a")
    n_ok = 0
    n_winloss = 0

    with ThreadPoolExecutor(max_workers=args.n_threads) as pool:
        futures = {pool.submit(process_sample, s, args): s for s in todo}
        pbar = tqdm(total=len(todo), desc="rollouts")
        for fut in futures:
            try:
                result = fut.result()
            except Exception as e:
                print(f"sample failed: {e}", file=sys.stderr)
                pbar.update(1)
                continue
            if result is None:
                pbar.update(1)
                continue
            n_ok += 1
            wins = sum(1 for t in result["trajectories"] if t["is_fixed_correct"])
            losses = sum(1 for t in result["trajectories"] if not t["is_fixed_correct"])
            if wins > 0 and losses > 0:
                n_winloss += 1
            fout.write(json.dumps(result) + "\n")
            fout.flush()
            pbar.update(1)
            pbar.set_postfix(ok=n_ok, winloss=n_winloss)
        pbar.close()

    fout.close()
    print(f"Done. processed={n_ok}, with_winloss={n_winloss} ({100*n_winloss/max(n_ok,1):.1f}%)")


if __name__ == "__main__":
    main()