"""
Preparation (里程碑) API Handler

职责：
- 更新项目里程碑数据
- 不支持创建和删除（里程碑随项目自动生成）

实现的接口：
PUT:
- /preparation - 更新里程碑数据
"""

from typing import List, Dict, Any
from ...datasource.api.handler import BaseApiHandler
from ...datasource.task_result import TaskResult
from ...common.sync_node import SyncNode
from ...datasource.api.errors import ERROR_VALIDATION_FAILED
from .sync_node import PreparationSyncNode
from schemas.project_extensions.preparation import PreparationDetail, PostPreparation


class PreparationApiHandler(BaseApiHandler):
    """里程碑 API Handler"""
    
    def __init__(self):
        super().__init__()
        self._node_type = "preparation"
        self._node_class = PreparationSyncNode
        self._schema = PreparationDetail
        self._filter_project_id = None
        self.update_schemas = [PostPreparation]

    def set_filter_project_id(self, project_id: str | List[str]):
        """设置要加载的项目ID过滤列表"""
        self._filter_project_id = project_id

    def set_target_project_ids(self, target_project_ids: List[str]) -> None:
        """设置目标项目ID列表"""
        self.set_filter_project_id(target_project_ids)

    async def load(self) -> List[SyncNode]:
        """从 API 加载里程碑数据（需要项目上下文）"""
        from ..project.api_handler import ProjectApiHandler
        
        # 获取要加载的项目列表
        projects = self._collection.filter(node_type="project")
        if not projects:
            print(" No projects found, skipping preparation load")
            return []
        
        nodes = []
        for project in projects:
            project_id = project.data_id
            
            try:
                # 从 project context 或缓存获取 all_info
                all_info = project.context.get("all_info")
                if not all_info:
                    all_info = await ProjectApiHandler.get_all_info(
                        self.api_client,
                        project_id
                    )
                
                # 提取 preparation_list
                preparation_list = all_info.get("preparation_list", [])
                print(f"  Project {project_id}: {len(preparation_list)} preparations")
                
                for prep_data in preparation_list:
                    # 验证数据
                    try:
                        validated = self._schema.model_validate(prep_data)
                        node = self._create_node(validated.model_dump())
                        nodes.append(node)
                    except Exception as e:
                        print(f" Skipping invalid preparation: {e}")
                        continue
                        
            except Exception as e:
                print(f" Failed to load preparations for project {project_id}: {e}")
                continue
        
        return nodes
    
    async def create_all(self, nodes: List[SyncNode]) -> List[TaskResult]:
        """不支持创建（里程碑随项目自动生成）"""
        return [
            TaskResult.failed(node_id=node.node_id, error="Preparation creation not supported (auto-generated with project)")
            for node in nodes
        ]
    
    async def update_all(self, nodes: List[SyncNode]) -> List[TaskResult]:
        """批量更新里程碑数据"""
        from pydantic import ValidationError
        
        results = []
        
        for node in nodes:
            node_data = node.get_data()
            if node_data is None:
                error_msg = node.error or "Node data is missing or invalid"
                results.append(TaskResult.failed(node_id=node.node_id, error=f"Cannot update: {error_msg}"))
                continue
            
            origin_data = node.get_origin_data() or {}
            update_data = self._filter_update_data(node_data, origin_data, PostPreparation)
            if not update_data:
                reason = f"No physical diff found for preparation {node.data_id} despite strategy update request (Normalization Discrepancy)."
                print(f"  [WARNING] [preparation] {reason}")
                results.append(TaskResult.skipped(node_id=node.node_id, reason=reason))
                continue
            
            # 验证并转换为 Pydantic model
            try:
                update_model = PostPreparation.model_validate(update_data)
            except Exception as e:
                results.append(TaskResult.failed(node_id=node.node_id, error=f"{ERROR_VALIDATION_FAILED}: {e}"))
                continue
            
            push_id = self._generate_push_id()
            biz_id = node.data_id or update_model.id
            if not biz_id:
                results.append(TaskResult.failed(node_id=node.node_id, error="Missing biz_id for update"))
                continue
            
            try:
                await api_update_preparation(self.api_client, update_model, push_id, biz_id)
                results.append(TaskResult.success(node_id=node.node_id))
            except Exception as e:
                results.append(TaskResult.failed(node_id=node.node_id, error=str(e)))
        
        return results

    async def delete_all(self, nodes: List[SyncNode]) -> List[TaskResult]:
        """不支持删除"""
        return [
            TaskResult.failed(node_id=node.node_id, error="Preparation deletion not supported")
            for node in nodes
        ]

    def _create_node(self, data: Dict[str, Any]) -> SyncNode:
        return self._create_basic_node(data, depend_ids=[])


# ========== 静态 API 函数 ==========

async def api_update_preparation(client, data: PostPreparation, push_id: str, biz_id: str) -> None:
    """
    PUT /preparation_nodes - 更新里程碑数据
    """
    request_data = {"push_id": push_id, "biz_id": biz_id, "data": data.model_dump(exclude_unset=True)}
    response = await client.request(method="PUT", endpoint="/preparation_nodes", data=request_data)
    if response.get("code") != 200:
        raise Exception(f"API error: {response.get('message', 'Unknown error')}")