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

from bread import BreadRecipe
from config import Settings

app = FastAPI(
    title="Dough Calculator API",
    description="""Calculate bread ingredient proportions
                   based on baker's percentages""",
    version="1.0.0"
)

settings = Settings()

# CORS middleware
app.add_middleware(
    CORSMiddleware,
    allow_origins=settings.cors_origins,
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)


@app.post("/calculate", summary="Calculate bread ingredients")
def calculate_bread_ingredients(recipe: BreadRecipe):
    """
    Calculate the exact quantities of ingredients needed for bread.

    **Inputs (what the user provides):**
    - total_flour: Total flour weight desired (grams)
    - hydration: Total hydration percentage
    - sourdough_percentage: Sourdough as % of total flour
    - sourdough_ratio: Flour:water ratio in the starter
    - salt: Salt as % of total flour

    **Outputs (what to use):**
    - flour_to_add: Flour to add (excluding flour in sourdough)
    - water_to_add: Water to add (excluding water in sourdough)
    - sourdough_weight: Total sourdough needed
    - salt_weight: Salt needed
    """
    return {
        "ingredients_to_add": {
            "flour": recipe.flour_to_add,
            "water": recipe.water_to_add,
            "sourdough": recipe.sourdough_weight,
            "salt": recipe.salt_weight
        },
        "details": {
            "total_flour": recipe.total_flour,
            "total_water": recipe.total_water,
            "flour_in_sourdough": recipe.flour_in_sourdough,
            "water_in_sourdough": recipe.water_in_sourdough
        }
    }


@app.get("/", summary="API information")
def root():
    """Root endpoint with API information."""
    return {
        "message": "Dough Calculator API",
        "docs": "/docs",
        "version": "1.0.0"
    }