"""数学学习系统后端入口。"""
from __future__ import annotations

import os

from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from fastapi.staticfiles import StaticFiles

from database import REPO_ROOT, ensure_schema
from routers import (
    analytics,
    archive,
    auth,
    catalog,
    courses,
    data,
    ebooks,
    llm,
    knowledge_graph,
    overview,
    practice,
    question_bank,
    users,
)


# 启动只对齐表结构（建表 / 补列），不写任何业务数据：
# 换成自己准备好的 math.db 后，重启即原样使用，不会被种子改动。
# 种子数据与历史数据迁移只在初始化时执行：
#   cd backend && .venv/bin/python -m seed [--force]
ensure_schema()


def _cors_origins() -> list[str]:
    raw = os.getenv("CORS_ORIGINS", "http://localhost:5173,http://127.0.0.1:5173")
    return [origin.strip() for origin in raw.split(",") if origin.strip()]


app = FastAPI(
    title="数学学习系统 API",
    description="个人数学学习系统后端：章节组卷判分、掌握度引擎、错题与学习档案。",
    version="1.0.0",
)
app.add_middleware(
    CORSMiddleware,
    allow_origins=_cors_origins(),
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
    # 阅读器依赖 Range 分段加载，需要能读到这几个响应头
    expose_headers=["Accept-Ranges", "Content-Range", "Content-Length"],
)

app.include_router(overview.router, prefix="/api")
app.include_router(data.router, prefix="/api")
app.include_router(analytics.router, prefix="/api")
app.include_router(practice.router, prefix="/api")
app.include_router(archive.router, prefix="/api")
app.include_router(catalog.router, prefix="/api")
app.include_router(courses.router, prefix="/api")
app.include_router(ebooks.router, prefix="/api")
app.include_router(ebooks.progress_router, prefix="/api")
app.include_router(question_bank.router, prefix="/api")
app.include_router(llm.router, prefix="/api")
app.include_router(auth.router, prefix="/api")
app.include_router(users.router, prefix="/api")
app.include_router(knowledge_graph.router, prefix="/api")

image_dir = REPO_ROOT / "data" / "question_images"
image_dir.mkdir(parents=True, exist_ok=True)
app.mount(
    "/api/question-images",
    StaticFiles(directory=image_dir),
    name="question-images",
)


@app.get("/api/health")
def health():
    return {"status": "ok", "service": "math-learning-backend"}