# Copyright (c) 2025 Patrick Motsch
# Merge clickup.updateTask node parameter taskUpdateEntries into taskUpdate JSON.

import json
import logging
from datetime import datetime, timezone
from typing import Any, Dict, List, Optional

logger = logging.getLogger(__name__)


def _unwrap_value(v: Any) -> Any:
    if isinstance(v, dict) and v.get("type") == "value" and "value" in v:
        return v.get("value")
    return v


def _unwrap_dynamic(v: Any) -> Any:
    return _unwrap_value(v)


def _parse_int_list(val: Any) -> List[int]:
    if val is None:
        return []
    val = _unwrap_value(val)
    if isinstance(val, str) and val.strip():
        try:
            parsed = json.loads(val)
            if isinstance(parsed, list):
                return [int(x) for x in parsed if x is not None and str(x).strip() != ""]
        except (json.JSONDecodeError, ValueError, TypeError):
            return []
    if isinstance(val, list):
        out: List[int] = []
        for x in val:
            if x is None or (isinstance(x, str) and not x.strip()):
                continue
            try:
                out.append(int(x))
            except (ValueError, TypeError):
                continue
        return out
    return []


def _parse_due_date_ms(v: Any) -> Optional[int]:
    v = _unwrap_value(v)
    if v is None or v == "":
        return None
    if isinstance(v, str) and len(v) >= 10 and v[4] == "-" and v[7] == "-":
        try:
            dt = datetime.strptime(v[:10], "%Y-%m-%d").replace(tzinfo=timezone.utc)
            return int(dt.timestamp() * 1000)
        except ValueError:
            pass
    try:
        i = int(float(v))
        return i if i > 0 else None
    except (ValueError, TypeError):
        return None


def _parse_time_estimate_hours_to_ms(v: Any) -> Optional[int]:
    v = _unwrap_value(v)
    if v is None or v == "":
        return None
    try:
        h = float(v)
        if h < 0:
            return None
        return int(round(h * 3600 * 1000))
    except (ValueError, TypeError):
        return None


def merge_clickup_task_update_entries(resolved_params: Dict[str, Any]) -> None:
    """
    Pop taskUpdateEntries from resolved_params and merge into taskUpdate (dict or JSON string).
    Existing taskUpdate (advanced JSON) is the base; entry rows override by key.
    """
    entries = resolved_params.pop("taskUpdateEntries", None)
    json_raw = resolved_params.get("taskUpdate")
    base: Dict[str, Any] = {}
    if isinstance(json_raw, str) and json_raw.strip():
        try:
            parsed = json.loads(json_raw)
            if isinstance(parsed, dict):
                base = dict(parsed)
        except json.JSONDecodeError:
            logger.warning("clickup.updateTask: taskUpdate is not valid JSON, ignoring base")
    elif isinstance(json_raw, dict):
        base = dict(json_raw)

    if not isinstance(entries, list) or not entries:
        if not base and json_raw not in (None, "", {}):
            resolved_params["taskUpdate"] = json_raw
        elif base:
            resolved_params["taskUpdate"] = json.dumps(base, ensure_ascii=False)
        return

    overlay: Dict[str, Any] = {}
    custom_rows: List[Dict[str, Any]] = []

    for row in entries:
        if not isinstance(row, dict):
            continue
        fk = row.get("fieldKey") or row.get("field")
        if fk is None:
            continue
        fk = str(fk).strip()
        val = _unwrap_dynamic(row.get("value"))

        if fk == "custom_field":
            cfid = _unwrap_dynamic(row.get("customFieldId"))
            if not cfid or not str(cfid).strip():
                continue
            if val is None or val == "":
                continue
            custom_rows.append({"id": str(cfid).strip(), "value": val})
            continue

        if fk == "name" and val is not None and str(val).strip():
            overlay["name"] = str(val).strip()
        elif fk == "description":
            overlay["description"] = "" if val is None else str(val)
        elif fk == "status" and val is not None and str(val).strip():
            overlay["status"] = str(val).strip()
        elif fk == "priority":
            if val is None or val == "":
                continue
            try:
                pi = int(float(val))
                if 1 <= pi <= 4:
                    overlay["priority"] = pi
            except (ValueError, TypeError):
                pass
        elif fk == "due_date":
            dms = _parse_due_date_ms(val)
            if dms is not None:
                overlay["due_date"] = dms
        elif fk == "time_estimate_h":
            tms = _parse_time_estimate_hours_to_ms(val)
            if tms is not None:
                overlay["time_estimate"] = tms
        elif fk == "time_estimate_ms":
            if val is None or val == "":
                continue
            try:
                tms = int(float(val))
                if tms > 0:
                    overlay["time_estimate"] = tms
            except (ValueError, TypeError):
                pass
        elif fk == "assignees":
            ids = _parse_int_list(val)
            if ids:
                overlay["assignees"] = ids
        else:
            logger.debug("clickup.updateTask: unknown fieldKey %s", fk)

    merged = {**base, **overlay}

    if custom_rows:
        by_id: Dict[str, Dict[str, Any]] = {}
        existing = merged.get("custom_fields")
        if isinstance(existing, list):
            for x in existing:
                if isinstance(x, dict) and x.get("id") is not None:
                    by_id[str(x["id"])] = x
        for x in custom_rows:
            by_id[str(x["id"])] = x
        merged["custom_fields"] = list(by_id.values())

    resolved_params["taskUpdate"] = json.dumps(merged, ensure_ascii=False) if merged else ""