from typing import Dict, List, Literal
from pydantic import BaseModel, Field, HttpUrl


LangCode = Literal["en", "hn", "mr", "kn"]


class CourseInput(BaseModel):
    course_code: str = Field(..., min_length=1)
    name: str = Field(..., min_length=1)
    course_type: str = Field(..., min_length=1)
    syllabus_url: HttpUrl
    semester: int = Field(..., ge=1, le=12)


class CourseSummary(BaseModel):
    course_code: str
    ai_summary: Dict[LangCode, str]


class CourseProcessError(BaseModel):
    course_code: str
    error: str


class SyllabusProcessResponse(BaseModel):
    results: List[CourseSummary]
    failed: List[CourseProcessError] = Field(default_factory=list)
    total_received: int
    total_processed: int
    total_failed: int


class ChatMessage(BaseModel):
    role: Literal["user", "assistant", "system"]
    content: str


class ChatRequest(BaseModel):
    query: str
    history: List[ChatMessage] = Field(default_factory=list, max_length=5)
    student_id: int = Field(..., ge=1)
    lang_code: LangCode
    semester: int = Field(..., ge=1, le=12)


class ChatResponse(BaseModel):
    reply_markdown: str