from pydantic import BaseModel, Field, field_validator, model_validator
from fastapi import HTTPException
from typing import List, Optional, Literal
from ..common.validators import DateStr
from ..common.base import BaseResponseWithID

class PlanNode(BaseModel):
    date: DateStr = Field(..., description="计划节点时间", examples=["2024-01-01"])
    quantity: float = Field(..., description="计划完成量", examples=[100.0])
    is_audit: Optional[bool] = Field(False, description="是否已审核", examples=[False])

    @field_validator("quantity")
    def validate_price(cls, v):
        """验证金额必须为非负数"""
        if v < 0:
            raise HTTPException(status_code=400, detail='计划完成量不能小于等于0')
        return v

class ConstructionResponse(BaseResponseWithID):
    """
    施工任务模型，存储在CouchDB中的施工任务文档
    """
    id : str = Field(..., description="施工任务ID")
    project_id: str = Field(..., description="所属项目ID", examples=["project123"])
    contract_id: Optional[str] = Field(None, description="所属合同ID", examples=["contract456"])
    show_name: str = Field(..., description="展示名称", examples=["桩基础施工任务"])
    construction_section: str = Field(..., description="施工区域", examples=["GF"])
    status: Optional[int] = Field(None, description="施工状态", examples=[0])
    task_type: str = Field(..., description="施工任务类型", examples=["zjcsgg"])
    plan_start_date: Optional[DateStr] = Field(None, description="计划开工时间", examples=["2024-01-01"])
    plan_complete_date: Optional[DateStr] = Field(None, description="计划完工时间", examples=["2024-06-01"])
    actual_complete_date: Optional[DateStr] = Field(None, description="实际完工时间", examples=["2024-05-30"])
    complete_quantity: float = Field(0.0, description="实际完成量累计", examples=[0.0])
    complete_rate: float = Field(0.0, description="实际完成率(%)", examples=[0.0])
    contract_quantity: Optional[float] = Field(None, description="设计量", examples=[1000.0])
    plan_node: List[PlanNode] = Field(default_factory=list, description="计划节点列表")
    statistic_date: Optional[DateStr] = Field(None, description="统计节点时间", examples=["2024-05-31"])
    # sort: int = Field(0, description="排序字段", examples=[0])
    is_crucial:Optional[bool] = Field(False, description="是否为关键线路")
    # 2025-10-20新增字段，延迟时间
    delay_days: Optional[int] = Field(None, description="延迟时间（天）", examples=[0])

class ConstructionCreate(BaseModel):
    """
    施工任务创建模型
    不对应operation
    """
    project_id: str = Field(..., description="所属项目ID", examples=["project123"])
    contract_id: Optional[str] = Field(None, description="所属合同ID", examples=["contract456"])
    show_name: str = Field(..., description="展示名称", examples=["桩基础施工任务"])
    construction_section: str = Field(..., description="施工区域", examples=["GF"])
    task_type: str = Field(..., description="施工任务类型", examples=["zjcsgg"])
    is_crucial:Optional[bool] = Field(False, description="是否为关键线路")



class ConstructionUpdate(BaseModel):
    """
    施工任务更新模型
    CONSTRUCTION_BASE_INFO = "construction.base_info"
    """
    id: str = Field(..., description="施工任务ID")
    contract_id: Optional[str] = Field(None, description="所属合同ID", examples=["contract456"])
    show_name: str | None = Field(None, description="展示名称（仅QT类施工可以修改名称）", examples=["桩基础施工任务"])
    is_crucial:bool | None = Field(False, description="是否为关键线路")

class ConstructionPlanUpdate(BaseModel):
    """
    施工计划更新模型
    对应 CONSTRUCTION_PLAN = "construction.plan"
    
    业务逻辑说明：
    - API要求计划节点时间必须晚于计划开工日期（不能等于）
    - 自动清理脏数据：如果 plan_node 有2个或以上节点，删除：
      1. 开头节点：如果其 date 等于 plan_start_date
      2. 结尾节点：如果其 date 等于 plan_complete_date
    - 这样避免提交包含边界节点的数据导致API报错
    """
    id: str = Field(..., description="施工任务ID")
    plan_start_date: Optional[str] = Field(None, description="计划开工时间", examples=["2024-01-01"])
    plan_complete_date: Optional[str] = Field(None, description="计划完工时间", examples=["2024-01-01"])
    contract_quantity: float = Field(..., description="设计量")
    plan_node: Optional[List[PlanNode]] = Field(default_factory=list, description="计划节点列表")

    @field_validator("contract_quantity")
    def validate_price(cls, v):
        """验证金额必须为非负数"""
        if v < 0:
            raise HTTPException(status_code=400, detail='设计量不能小于0')
        return v
    
    @model_validator(mode='after')
    def clean_plan_nodes(self):
        """
        清理计划节点列表中的边界节点
        
        如果 plan_node 有2个或以上节点，删除：
        - 开头节点：date 等于 plan_start_date
        - 结尾节点：date 等于 plan_complete_date
        
        这避免了API报错"计划节点时间必须晚于计划开工日期"
        """
        if not self.plan_node or len(self.plan_node) < 2:
            return self
        
        cleaned_nodes = list(self.plan_node)
        
        # 删除开头的边界节点
        if (self.plan_start_date and 
            cleaned_nodes and 
            cleaned_nodes[0].date == self.plan_start_date):
            cleaned_nodes.pop(0)
        
        # 删除结尾的边界节点
        if (self.plan_complete_date and 
            cleaned_nodes and 
            cleaned_nodes[-1].date == self.plan_complete_date):
            cleaned_nodes.pop()
        
        self.plan_node = cleaned_nodes
        return self