from pydantic import BaseModel, Field
from datetime import datetime
from typing import Any, List


class StudentCreate(BaseModel):
    first_name: str = Field(..., min_length=1)
    age: int = Field(..., ge=8, le=12)
    grade: str


class StudentRead(BaseModel):
    id: int
    first_name: str
    age: int
    grade: str

    class Config:
        from_attributes = True


class UserRead(BaseModel):
    id: int
    username: str
    role: str
    student_id: int | None = None
    student: StudentRead | None = None

    class Config:
        from_attributes = True


class LoginRequest(BaseModel):
    username: str = Field(..., min_length=1)
    password: str = Field(..., min_length=1)


class LoginResponse(BaseModel):
    access_token: str
    token_type: str = "bearer"
    user: UserRead


class StudentAccountCreate(StudentCreate):
    username: str = Field(..., min_length=1)
    password: str = Field(..., min_length=1)


class StudentAccountResponse(BaseModel):
    student: StudentRead
    user: UserRead


class ChatRequest(BaseModel):
    student_id: int
    message: str
    lesson_title: str | None = None
    asset_title: str | None = None
    section_title: str | None = None
    section_context_key: str | None = None
    section_context: str | None = None
    step_percent: int | None = None


class ChatResponse(BaseModel):
    reply: str
    should_speak: bool = True
    advance_lesson_step: bool = False


class MessageRead(BaseModel):
    id: int
    student_id: int
    role: str
    content: str
    created_at: datetime

    class Config:
        from_attributes = True


class TTSProfile(BaseModel):
    id: str
    label: str
    description: str


class TTSProfilesResponse(BaseModel):
    profiles: List[TTSProfile]


class TTSRequest(BaseModel):
    text: str = Field(..., min_length=1, max_length=4096)
    profile_id: str = Field(..., min_length=1)


class SkillProgress(BaseModel):
    code: str
    subject: str
    label: str
    mastery_score: float
    confidence: float
    evidence_count: int


class ProgressResponse(BaseModel):
    student: StudentRead
    progress: List[SkillProgress]


class ProgramAsset(BaseModel):
    name: str
    title: str
    path: str
    url: str
    sections: List[dict] = []


class ProgramLesson(BaseModel):
    id: str
    title: str
    subject: str
    grade: str
    cycle: str
    asset_count: int
    assets: List[ProgramAsset] = []


class ProgramLessonListResponse(BaseModel):
    lessons: List[ProgramLesson]


class ProgramReviewRequest(BaseModel):
    node_key: str = Field(..., min_length=1)
    status: str = "needs_changes"
    comment: str = ""


class StudentProgramAssignRequest(BaseModel):
    lesson_id: str = Field(..., min_length=1)


class StudentProgramResponse(BaseModel):
    student: StudentRead
    lesson: ProgramLesson | None = None
    start_asset_index: int = 0
    start_section_index: int = 0


class StudentProgramStartRequest(BaseModel):
    asset_index: int = Field(..., ge=0)
    section_index: int = Field(..., ge=0)


class LessonCardState(BaseModel):
    lesson_id: str
    asset_path: str
    asset_title: str
    section_key: str
    section_title: str
    comprehension_score: float = Field(..., ge=0, le=100)
    attempts: int = Field(0, ge=0)
    validated: bool = False


class LessonSessionEndRequest(BaseModel):
    student_id: int
    lesson_id: str
    lesson_title: str
    conversation: List[dict[str, Any]]
    card_states: List[LessonCardState] = []


class LessonSessionLogRead(BaseModel):
    id: int
    student_id: int
    lesson_id: str
    lesson_title: str
    started_at: datetime
    ended_at: datetime
    conversation: str
    card_results: str

    class Config:
        from_attributes = True


class LessonCardProgressRead(BaseModel):
    id: int
    student_id: int
    lesson_id: str
    asset_path: str
    asset_title: str
    section_key: str
    section_title: str
    comprehension_score: float
    attempts: int
    validated_at: datetime | None = None
    updated_at: datetime

    class Config:
        from_attributes = True


class AssessmentQuestionResponse(BaseModel):
    skill_code: str
    skill_label: str
    question: str


class AssessmentAnswerRequest(BaseModel):
    student_id: int
    skill_code: str
    answer: str


class AssessmentAnswerResponse(BaseModel):
    correct: bool
    feedback: str
    mastery_score: float