from datetime import datetime
from pydantic import BaseModel


class CourseCreate(BaseModel):
    title: str
    description: str | None = None


class CourseUpdate(BaseModel):
    title: str | None = None
    description: str | None = None
    status: str | None = None
    is_featured: int | None = None
    requires_subscription: int | None = None


class ModuleCreate(BaseModel):
    title: str
    description: str | None = None


class ModuleUpdate(BaseModel):
    title: str | None = None
    description: str | None = None
    position: int | None = None


class LessonCreate(BaseModel):
    title: str
    lesson_type: str  # text, video, document, quiz, live_session
    description: str | None = None
    content_text: str | None = None
    video_url: str | None = None
    local_file_path: str | None = None
    quiz_id: int | None = None
    live_session_url: str | None = None
    live_session_start: datetime | None = None
    live_session_end: datetime | None = None
    duration_minutes: int | None = None
    is_required: int = 1


class LessonUpdate(BaseModel):
    title: str | None = None
    description: str | None = None
    content_text: str | None = None
    video_url: str | None = None
    local_file_path: str | None = None
    quiz_id: int | None = None
    live_session_url: str | None = None
    live_session_start: datetime | None = None
    live_session_end: datetime | None = None
    duration_minutes: int | None = None
    is_required: int | None = None
    position: int | None = None


class LessonResponse(BaseModel):
    id: int
    module_id: int
    title: str
    description: str | None = None
    position: int
    lesson_type: str
    content_text: str | None = None
    video_url: str | None = None
    video_provider: str | None = None
    local_file_path: str | None = None
    quiz_id: int | None = None
    live_session_url: str | None = None
    live_session_start: datetime | None = None
    live_session_end: datetime | None = None
    bbb_meeting_id: str | None = None
    duration_minutes: int | None = None
    is_required: int = 1
    class Config:
        from_attributes = True


class ModuleResponse(BaseModel):
    id: int
    course_id: int
    title: str
    description: str | None = None
    position: int
    lessons: list[LessonResponse] = []
    class Config:
        from_attributes = True


class CourseResponse(BaseModel):
    id: int
    title: str
    description: str | None = None
    thumbnail_path: str | None = None
    user_id: int
    status: str
    is_featured: int = 0
    requires_subscription: int = 0
    created_at: datetime
    updated_at: datetime | None = None
    class Config:
        from_attributes = True


class CourseDetail(CourseResponse):
    modules: list[ModuleResponse] = []
    creator_name: str | None = None
    enrolled_count: int = 0
    my_enrollment: dict | None = None


class EnrollmentResponse(BaseModel):
    id: int
    course_id: int
    user_id: int
    enrolled_at: datetime
    completed_at: datetime | None = None
    progress_pct: float = 0.0
    status: str
    class Config:
        from_attributes = True


class LessonProgressUpdate(BaseModel):
    status: str | None = None  # in_progress, completed
    time_spent_seconds: int | None = None
    score: float | None = None


class AIContentRequest(BaseModel):
    prompt: str
    action: str = "generate"  # generate, refine
    existing_content: str | None = None