# -*- coding: utf-8 -*-
"""
CRM 业务数据模型
定义客户沟通日志、标签、跟进待办、销售机会四张业务表。
所有主键均为 UUID，与 User/KnowledgeChunk 保持一致的 ID 策略。
"""

import uuid
from datetime import datetime

from sqlalchemy import ForeignKey, String, Text, Numeric, func
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import Mapped, mapped_column

from app.core.database import Base


class CustomerLog(Base):
    """
    客户沟通日志表
    记录每次与客户的沟通内容（电话/拜访/微信等），
    新增日志时会触发后台 AI 任务自动提取标签和待办。
    """

    __tablename__ = "customer_logs"

    id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True), primary_key=True, default=uuid.uuid4,
    )
    customer_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("clients.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
        comment="关联客户 ID",
    )
    content: Mapped[str] = mapped_column(
        Text, nullable=False, comment="沟通日志内容",
    )
    created_at: Mapped[datetime] = mapped_column(
        server_default=func.now(), comment="记录时间",
    )


class CustomerTag(Base):
    """
    客户标签表
    由 AI 从沟通日志中自动提取，也支持手动添加。
    同一客户下的标签名唯一（通过业务逻辑控制去重）。
    """

    __tablename__ = "customer_tags"

    id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True), primary_key=True, default=uuid.uuid4,
    )
    customer_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("clients.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
        comment="关联客户 ID",
    )
    tag_name: Mapped[str] = mapped_column(
        String(100), nullable=False, comment="标签名称，如'价格敏感'、'决策周期长'",
    )
    created_at: Mapped[datetime] = mapped_column(
        server_default=func.now(),
    )


class FollowUpToDo(Base):
    """
    跟进待办表
    由 AI 根据沟通日志自动生成下一步行动建议，
    也可由用户手动创建。status 为简单的二态: pending / done。
    """

    __tablename__ = "follow_up_todos"

    id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True), primary_key=True, default=uuid.uuid4,
    )
    customer_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("clients.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
        comment="关联客户 ID",
    )
    task_desc: Mapped[str] = mapped_column(
        Text, nullable=False, comment="待办任务描述",
    )
    status: Mapped[str] = mapped_column(
        String(20), nullable=False, default="pending",
        comment="状态: pending(待处理) / done(已完成)",
    )
    created_at: Mapped[datetime] = mapped_column(
        server_default=func.now(),
    )


class SalesOpportunity(Base):
    """
    销售机会表
    跟踪每个客户的销售漏斗阶段和金额，用于经营看板和复盘报告。
    stage 四阶段: 意向 → 谈判 → 成交 → 流失
    """

    __tablename__ = "sales_opportunities"

    id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True), primary_key=True, default=uuid.uuid4,
    )
    customer_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("clients.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
        comment="关联客户 ID",
    )
    amount: Mapped[float] = mapped_column(
        Numeric(12, 2), nullable=False, default=0,
        comment="预估/实际金额 (元)",
    )
    stage: Mapped[str] = mapped_column(
        String(20), nullable=False, default="意向",
        comment="漏斗阶段: 意向 / 谈判 / 成交 / 流失",
    )
    created_at: Mapped[datetime] = mapped_column(
        server_default=func.now(),
    )