from __future__ import annotations

from .shared import *

class SignalCaptureNewProjectMixin:
    async def _auto_create_project_from_new_signal(
        self,
        *,
        signal_id: int,
        message: str,
        sender: str,
        tenant_id: int,
        requested_at: Optional[datetime] = None,
    ) -> Optional[int]:
        """当分类为 new_project 时，自动创建项目并关联当前信号。"""
        requested_dt = requested_at or now_cn_aware()
        if requested_dt.tzinfo is None:
            requested_dt = requested_dt.replace(tzinfo=CN_TZ)
        project_brief = await self._draft_new_project_brief(
            message=message,
            tenant_id=tenant_id,
            sender=sender,
            requested_at=requested_dt,
        )
        title = self._normalize_single_line_text(project_brief.get("title") or "", max_len=120)
        if not title:
            title = self._normalize_single_line_text(message or "飞书新需求立项", max_len=40) or "飞书新需求立项"
        raw_desc = self._normalize_multiline_text(project_brief.get("description") or message or "", max_len=1200)
        requested_at_text = self._format_cn_time(requested_dt)
        description = self._normalize_multiline_text(
            f"需求提出人：{sender}\n"
            f"提出时间：{requested_at_text}\n"
            f"需求来源：飞书群聊\n\n"
            f"需求说明：{raw_desc or self._normalize_multiline_text(message, max_len=500)}",
            max_len=1800,
        )
        assigned_role = str(project_brief.get("primary_role") or "ai_engineer").strip()[:50] or "ai_engineer"

        owner_id: Optional[int] = None
        owner_result = await self.db.execute(
            select(User.id).where(
                and_(
                    User.tenant_id == tenant_id,
                    User.status == "active",
                    User.role.in_(["BOSS", "ADMIN"]),
                )
            ).order_by(User.id.asc()).limit(1)
        )
        owner_id = owner_result.scalar_one_or_none()

        await ensure_project_id_sequence(self.db)
        project = Project(
            name=title[:80] or "新项目",
            title=title,
            description=description,
            owner_id=owner_id,
            status="active",
            assigned_role=assigned_role,
            signal_count=1,
            tenant_id=tenant_id,
        )
        self.db.add(project)
        await self.db.flush()
        await ensure_project_default_members(
            self.db,
            tenant_id=tenant_id,
            project_id=int(project.id),
            owner_id=int(project.owner_id) if project.owner_id is not None else None,
            assigned_role=project.assigned_role,
        )

        existing = await self.db.execute(
            text("SELECT id FROM project_signal_links WHERE project_id = :project_id AND signal_id = :signal_id"),
            {"project_id": int(project.id), "signal_id": int(signal_id)},
        )
        if existing.first() is None:
            link = ProjectSignalLink(
                project_id=int(project.id),
                signal_id=int(signal_id),
                link_type="ai_new_project_signal",
                relevance_score=0.98,
                tenant_id=tenant_id,
            )
            self.db.add(link)

        await self.db.execute(
            text("UPDATE signals SET processed = :processed WHERE id = :signal_id"),
            {"processed": True, "signal_id": int(signal_id)},
        )
        await self.db.commit()

        self._emit_ai_think(
            "new_project_created_from_signal",
            signal_id=signal_id,
            project_id=int(project.id),
            sender=sender,
        )
        return int(project.id)

    async def _draft_new_project_brief(
        self,
        *,
        message: str,
        tenant_id: int,
        sender: str,
        requested_at: datetime,
    ) -> Dict[str, Any]:
        requested_at_text = self._format_cn_time(requested_at)
        prompt = f"""你是 PMFlow 的立项助手。基于下面需求消息，提炼新项目基础信息。

需求提出人：{sender}
提出时间：{requested_at_text}

需求消息：
{message[:1000]}

输出 JSON：
{{
  "title": "项目标题（15-30字）",
  "description": "项目简介（80-200字）",
  "primary_role": "ai_engineer|backend|frontend|devops"
}}

只输出 JSON，不要 markdown，不要解释，不要乱码。"""
        try:
            raw = await self.llm.generate(
                prompt,
                db=self.db,
                tenant_id=tenant_id,
                function_name="feishu_new_project_brief",
            )
            parsed = self._parse_llm_json_response(raw)
            role = str(parsed.get("primary_role") or "ai_engineer").strip().lower()
            if role not in {"ai_engineer", "backend", "frontend", "devops"}:
                role = "ai_engineer"
            return {
                "title": self._normalize_single_line_text(str(parsed.get("title") or ""), max_len=120),
                "description": self._normalize_multiline_text(str(parsed.get("description") or ""), max_len=1200),
                "primary_role": role,
            }
        except Exception as exc:
            self._emit_ai_think("draft_new_project_brief_failed", error=str(exc))
            return {
                "title": self._normalize_single_line_text(message or "飞书新需求立项", max_len=40),
                "description": self._normalize_multiline_text(message, max_len=300),
                "primary_role": "ai_engineer",
            }