from pydantic import BaseModel, Field
from typing import Optional, List
from datetime import date, datetime
from enum import Enum

from models.task import TaskType, TaskStatus, ReviewDecision, AttachmentType, NoteType


class TaskBase(BaseModel):
    name: str = Field(..., min_length=1, max_length=255)
    description: Optional[str] = None
    task_type: str  # Changed from TaskType enum to str to support custom task types
    start_date: Optional[date] = None
    deadline: Optional[date] = None
    status: str = "not_started"  # Changed from TaskStatus enum to str to support custom statuses
    department: Optional[str] = None  # Standard or project-custom department, independent of assignee


class TaskCreate(TaskBase):
    project_id: int
    episode_id: Optional[int] = None
    shot_id: Optional[int] = None
    asset_id: Optional[int] = None
    assigned_user_id: Optional[int] = None


class TaskUpdate(BaseModel):
    name: Optional[str] = Field(None, min_length=1, max_length=255)
    description: Optional[str] = None
    task_type: Optional[str] = None  # Changed from TaskType enum to str to support custom task types
    start_date: Optional[date] = None
    deadline: Optional[date] = None
    status: Optional[str] = None  # Changed from TaskStatus enum to str to support custom statuses
    department: Optional[str] = None  # Standard or project-custom department, independent of assignee
    assigned_user_id: Optional[int] = None


class TaskStatusUpdate(BaseModel):
    status: str  # Changed from TaskStatus enum to str to support custom statuses


class TaskAssignment(BaseModel):
    assigned_user_id: int


class TaskResponse(TaskBase):
    id: int
    project_id: int
    episode_id: Optional[int] = None
    shot_id: Optional[int] = None
    asset_id: Optional[int] = None
    assigned_user_id: Optional[int] = None
    created_at: datetime
    updated_at: datetime
    
    # Related entity names for display
    project_name: Optional[str] = None
    episode_name: Optional[str] = None
    shot_name: Optional[str] = None
    asset_name: Optional[str] = None
    assigned_user_name: Optional[str] = None
    assigned_user_email: Optional[str] = None
    assigned_user_avatar_url: Optional[str] = None

    class Config:
        from_attributes = True


class TaskListResponse(BaseModel):
    id: int
    name: str
    task_type: str  # Changed from TaskType enum to str to support custom task types
    status: str  # Changed from TaskStatus enum to str to support custom statuses
    department: Optional[str] = None  # Standard or project-custom department, independent of assignee
    start_date: Optional[date] = None
    deadline: Optional[date] = None
    project_id: int
    project_name: str
    episode_id: Optional[int] = None
    episode_name: Optional[str] = None
    shot_id: Optional[int] = None
    shot_name: Optional[str] = None
    asset_id: Optional[int] = None
    asset_name: Optional[str] = None
    assigned_user_id: Optional[int] = None
    assigned_user_name: Optional[str] = None
    assigned_user_avatar_url: Optional[str] = None
    created_at: datetime
    updated_at: datetime

    class Config:
        from_attributes = True


# Production Notes schemas
class ProductionNoteBase(BaseModel):
    content: str = Field(..., min_length=1)
    parent_note_id: Optional[int] = None


class ProductionNoteCreate(ProductionNoteBase):
    note_type: NoteType = NoteType.INTERNAL


class ProductionNoteUpdate(BaseModel):
    content: str = Field(..., min_length=1)


class ProductionNoteResponse(ProductionNoteBase):
    id: int
    task_id: int
    user_id: int
    note_type: NoteType
    created_at: datetime
    updated_at: datetime
    
    # User information
    user_first_name: str
    user_last_name: str
    user_email: str
    user_avatar_url: Optional[str] = None
    
    # Child notes for threading
    child_notes: Optional[List['ProductionNoteResponse']] = None

    class Config:
        from_attributes = True


# Task Attachment schemas
class TaskAttachmentBase(BaseModel):
    file_name: str
    attachment_type: AttachmentType = AttachmentType.REFERENCE
    description: Optional[str] = None


class TaskAttachmentCreate(TaskAttachmentBase):
    pass


class TaskAttachmentResponse(TaskAttachmentBase):
    id: int
    task_id: int
    user_id: int
    file_path: str
    file_type: str
    file_size: int
    uploaded_at: datetime
    
    # User information
    user_first_name: str
    user_last_name: str
    
    # File serving URLs (computed properties)
    download_url: Optional[str] = None
    thumbnail_url: Optional[str] = None

    class Config:
        from_attributes = True


# Submission schemas
class SubmissionBase(BaseModel):
    notes: Optional[str] = None


class SubmissionCreate(SubmissionBase):
    pass


class SubmissionUpdate(BaseModel):
    notes: Optional[str] = None


class SubmissionResponse(SubmissionBase):
    id: int
    task_id: int
    user_id: int
    file_path: str
    file_name: str
    version_number: int
    submitted_at: datetime
    
    # User information
    user_first_name: str
    user_last_name: str
    
    # Latest review if any
    latest_review: Optional['ReviewResponse'] = None
    
    # File serving URLs (computed properties)
    download_url: Optional[str] = None
    thumbnail_url: Optional[str] = None
    stream_url: Optional[str] = None

    class Config:
        from_attributes = True


class SubmissionDateInfo(BaseModel):
    """Minimal per-task submission date, for lightweight bulk lookups (e.g. Gantt markers)."""
    task_id: int
    submitted_at: datetime

    class Config:
        from_attributes = True


# Review schemas
class ReviewBase(BaseModel):
    decision: ReviewDecision
    feedback: Optional[str] = None


class ReviewCreate(ReviewBase):
    pass


class ReviewResponse(ReviewBase):
    id: int
    submission_id: int
    reviewer_id: int
    reviewed_at: datetime
    
    # Reviewer information
    reviewer_first_name: str
    reviewer_last_name: str

    class Config:
        from_attributes = True


# Bulk action schemas
class BulkStatusUpdate(BaseModel):
    task_ids: List[int] = Field(..., min_length=1)
    status: str  # Changed from TaskStatus enum to str to support custom statuses


class BulkAssignment(BaseModel):
    task_ids: List[int] = Field(..., min_length=1)
    assigned_user_id: int


class BulkActionResult(BaseModel):
    success_count: int
    failed_count: int
    errors: Optional[List[dict]] = None


# Update forward references
ProductionNoteResponse.model_rebuild()
SubmissionResponse.model_rebuild()