"""One-time data fix (run in the EasyPanel container console):
Rewrite existing personas' openers (opener) to natural Thai.

Only rewords openers that:
  - open with a casual interjection/filler (เฮ้ / เอ้ / เอ่อ / hey / hi / yo ...),
  - open with ellipsis/dots ("..", "..."), or
  - end with a dismissive clause Thais would not say first
    ("แต่ไม่คิดจะซื้อหรอกนะ", "ไม่ได้จะซื้อ", "แค่มาดูเล่น", "ก็แค่มาเมิน"...).
Everyone else is left untouched (safe & reversible). Prints before -> after.

Usage:
  cd /app/backend
  python3 scripts/fix_openers.py
"""
from __future__ import annotations

import re
import sys
from pathlib import Path

# Make `app` importable no matter what directory the script is invoked from.
# The repo layout is  <backend>/app ; this script lives in <backend>/scripts/.
sys.path.insert(0, str(Path(__file__).resolve().parent.parent))

from app.config import Config
from app.services.groups import GroupStore

# Leading casual interjections/filler that make a Thai opener sound unnatural.
FILLER = re.compile(
    r"^(?:เฮ้|เอ้|เอ่อ|เอ๊ะ|อืม|เออ|นี่ๆ|นี่|ว่าไง|เฮย์|hey|hiya|hi|hello|yo)"
    r"[\s:,\-–—]*",
    re.IGNORECASE,
)
BARE_POLITE = re.compile(r"^(ครับ|ค่ะ)(\s|$)")
THAI_CHAR = re.compile(r"[\u0E00-\u0E7F]")
# Leading punctuation/dots ("..", "...") that look unfinished/un-natural.
LEAD_DOTS = re.compile(r"^[\.…\s]*")
# Trailing dismissive clauses Thais would not say in an opener
# ("แต่ไม่คิดจะซื้อหรอกนะ", "ไม่ได้จะซื้อ", "แค่มาดูเล่น", "ก็แค่มาเมิน"...).
DISMISS_TAIL = re.compile(
    r"\s*(?:แต่(?:ก็)?(?:ไม่(?:ได้)?คิดจะซื้อ|ไม่รู้จะซื้อ|ไม่ได้จะซื้อ|ไม่ตั้งใจซื้อ)|"
    r"แค่(?:มา)?ดู(?:เล่น)?|ก็แค่(?:มา)?ดู(?:เล่น)?|ก็แค่มาเมิน|"
    r"แต่กะแค่ลองดู|ก็แค่ลองดู)(?:หรอกนะ|หรอก|นะ|ล่ะ)?$"
)
# "just trying/looking" phrasing Thai customers do NOT use as an opener.
BROWSE_TRY = re.compile(
    r"ลอง(?:เข้าไปดู|กดดู|ปล่อย|ใช้|ดู)?|แค่(?:มา)?ดู|มาลอง|กดดู|แวะดู|ดูเล่น|แค่มาอ่าน"
)
QUESTION = re.compile(r"ไหม|หรือ|ยังไง|เท่าไหร่|ไหน|กี่|ตัวไหน|มีมั้ย|\?$")
INTEREST = re.compile(r"สนใจ|สอบถาม|อยาก|ขอถาม|ต้องการ|สนใจอยาก")


def fix_opener(existing: str) -> str | None:
    """Return the rewritten opener, or None when nothing needs changing."""
    if not isinstance(existing, str) or not existing.strip():
        return None
    s = existing.strip()
    # Only target Thai openers; leave English ones untouched.
    if not THAI_CHAR.search(s):
        return None

    # 0) Strip leading dots/ellipsis and any casual filler.
    new = LEAD_DOTS.sub("", s)
    m = FILLER.match(new)
    if m:
        new = new[m.end():]
    new = new.strip(" .…,:-–—;")

    # 1) Remove a trailing dismissive clause ("แต่ไม่คิดจะซื้อหรอกนะ" etc.),
    #    so the opener stays politely interested instead of pre-dismissing.
    new = DISMISS_TAIL.sub("", new).strip(" .…,:-–—;")

    # 2) If it now opens with a bare politeness word, prepend the greeting:
    #    "ครับ สนใจ..."  ->  "สวัสดีครับ สนใจ..."
    bp = BARE_POLITE.match(new)
    if bp:
        polite = new[: len(bp.group(1))]
        new = new[len(polite):].strip(" .…,:-–—;") or ""
        new = "สวัสดี" + polite + ((" " + new) if new else "")

    # 3) A "ลองดู / ลอง / แค่มาดู / กดดู" opener (just trying/browsing, no real
    #    question, not declaring interest) is unnatural in Thai. Rewrite it into
    #    a polite interest opener. (Any opener that already asks a question or
    #    says "สนใจ/สอบถาม" is left alone.)
    if BROWSE_TRY.search(new) and not QUESTION.search(new) and not INTEREST.search(new):
        polite = "ค่ะ" if "ค่ะ" in new else "ครับ"
        new = f"สวัสดี{polite} สนใจสอบถามสินค้าครับ ขอรายละเอียดได้ไหม"

    cleaned = " ".join(new.split())
    if not cleaned or cleaned == s:
        return None  # nothing meaningful changed (or was empty)
    return cleaned[:400]


def main() -> None:
    store = GroupStore(Config.DATA_DIR)
    groups = store.groups.all()
    fixed = skipped = 0
    seen: set[str] = set()
    for group in groups:
        gid = group.get("id") or group.get("_id")
        if not gid or gid in seen:
            continue
        seen.add(gid)
        raw = group.get("personas") or []
        personas = [p for p in raw if isinstance(p, dict) and p.get("id")]
        for p in personas:
            oid = p.get("id")
            old = p.get("opener") or ""
            new = fix_opener(old)
            if new is None:
                skipped += 1
                continue
            print(f"[{gid}] persona={oid!r}")
            print(f"   before: {old!r}")
            print(f"   after : {new!r}")
            store.update_persona(gid, oid, {"opener": new})
            fixed += 1
    print(f"\nDONE — fixed: {fixed}, left-as-is: {skipped}")


if __name__ == "__main__":
    main()