"""
Copyright 2024-2026 ReplyPier

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
"""

from pydantic import BaseModel, Field, validator
from typing import Optional, List, Dict, Any, Union, Literal
from uuid import UUID
from datetime import datetime
from app.models.workflow import WorkflowStatus
from app.models.workflow_node import NodeType, ActionType


# ==============================
# Workflow schemas
# ==============================

class WorkflowBase(BaseModel):
    name: str
    description: Optional[str] = None
    status: Optional[WorkflowStatus] = WorkflowStatus.DRAFT
    is_template: bool = False
    default_language: str = "en"
    canvas_data: Dict[str, Any] = Field(default_factory=dict)
    settings: Dict[str, Any] = Field(default_factory=dict)


class WorkflowCreate(WorkflowBase):
    agent_id: UUID


# ==============================
# Operation schemas for batch updates
# ==============================

class WorkflowNodeOperation(BaseModel):
    operation: Literal["create", "update", "delete"]
    id: Optional[UUID] = None  # Required for update/delete, optional for create
    node_type: Optional[NodeType] = None
    name: Optional[str] = None
    description: Optional[str] = None
    position_x: Optional[float] = None
    position_y: Optional[float] = None
    config: Optional[Dict[str, Any]] = None
    
    # Landing Page node fields
    landing_page_heading: Optional[str] = None
    landing_page_content: Optional[str] = None


class WorkflowConnectionOperation(BaseModel):
    operation: Literal["create", "update", "delete"]
    id: Optional[UUID] = None  # Required for update/delete, optional for create
    source_node_id: Optional[UUID] = None
    target_node_id: Optional[UUID] = None
    label: Optional[str] = None
    condition: Optional[str] = None
    priority: Optional[int] = None
    connection_metadata: Optional[Dict[str, Any]] = None


class WorkflowUpdate(BaseModel):
    name: Optional[str] = None
    description: Optional[str] = None
    status: Optional[WorkflowStatus] = None
    is_template: Optional[bool] = None
    default_language: Optional[str] = None
    canvas_data: Optional[Dict[str, Any]] = None
    settings: Optional[Dict[str, Any]] = None
    agent_id: Optional[UUID] = None
    nodes: Optional[List[WorkflowNodeOperation]] = None
    connections: Optional[List[WorkflowConnectionOperation]] = None


class WorkflowResponse(WorkflowBase):
    id: UUID
    organization_id: UUID
    agent_id: UUID
    created_by: UUID
    created_at: datetime
    updated_at: datetime

    class Config:
        orm_mode = True


# ==============================
# WorkflowNode schemas
# ==============================

class WorkflowNodeBase(BaseModel):
    workflow_id: UUID
    node_type: NodeType
    name: str
    description: Optional[str] = None
    position_x: float = 0
    position_y: float = 0
    config: Dict[str, Any] = Field(default_factory=dict)
    
    # Message node fields
    message_text: Optional[str] = None
    
    # Condition node fields
    condition_expression: Optional[str] = None
    
    # Action node fields
    action_type: Optional[ActionType] = None
    action_config: Optional[Dict[str, Any]] = None
    
    # Transfer node fields
    transfer_rules: Optional[Dict[str, Any]] = None
    
    # Wait node fields
    wait_duration: Optional[int] = None  # Duration in seconds
    wait_until_condition: Optional[str] = None
    
    # Landing Page node fields
    landing_page_heading: Optional[str] = None
    landing_page_content: Optional[str] = None


class WorkflowNodeCreate(WorkflowNodeBase):
    pass


class WorkflowNodeUpdate(BaseModel):
    node_type: Optional[NodeType] = None
    name: Optional[str] = None
    description: Optional[str] = None
    position_x: Optional[float] = None
    position_y: Optional[float] = None
    config: Optional[Dict[str, Any]] = None
    
    # Landing Page node fields
    landing_page_heading: Optional[str] = None
    landing_page_content: Optional[str] = None


class WorkflowNodeResponse(WorkflowNodeBase):
    id: UUID
    created_at: datetime
    updated_at: datetime

    class Config:
        orm_mode = True


# ==============================
# WorkflowConnection schemas
# ==============================

class WorkflowConnectionBase(BaseModel):
    workflow_id: UUID
    source_node_id: UUID
    target_node_id: UUID
    label: Optional[str] = None
    condition: Optional[str] = None
    priority: int = 0
    connection_metadata: Dict[str, Any] = Field(default_factory=dict)


class WorkflowConnectionCreate(WorkflowConnectionBase):
    pass


class WorkflowConnectionUpdate(BaseModel):
    label: Optional[str] = None
    condition: Optional[str] = None
    priority: Optional[int] = None
    connection_metadata: Optional[Dict[str, Any]] = None


class WorkflowConnectionResponse(WorkflowConnectionBase):
    id: UUID
    created_at: datetime
    updated_at: datetime

    class Config:
        orm_mode = True


# ==============================
# Additional composite schemas
# ==============================

class WorkflowDetailResponse(WorkflowResponse):
    nodes: List[WorkflowNodeResponse]
    connections: List[WorkflowConnectionResponse]

    class Config:
        orm_mode = True