import { NextResponse } from "next/server"
import { auth } from "@/lib/auth"
import { prisma } from "@/lib/prisma"
import { recipeCreateSchema } from "@/lib/validators"
import { fuzzyMatchIngredients, recalculateMissingCount } from "@/lib/ingredient-matcher"
import type { Prisma } from "@prisma/client"

export async function GET() {
  try {
    const session = await auth()
    if (!session?.user?.id) {
      return NextResponse.json({ error: "Unauthorized" }, { status: 401 })
    }

    const [recipes, barItems] = await Promise.all([
      prisma.recipe.findMany({
        where: { userId: session.user.id },
        orderBy: { createdAt: "desc" },
        include: {
          sourceDrink: {
            select: { name: true, type: true },
          },
        },
      }),
      prisma.barItem.findMany({
        where: {
          userId: session.user.id,
          quantity: { not: "EMPTY" },
        },
        select: { name: true },
      }),
    ])

    // Re-process ingredient availability against current bar inventory
    const processedRecipes = recipes.map((recipe) => {
      if (barItems.length > 0 && Array.isArray(recipe.ingredients)) {
        const ingredients = recipe.ingredients as { name: string; amount: string; available: boolean }[]
        const matched = fuzzyMatchIngredients(ingredients, barItems)
        return {
          ...recipe,
          ingredients: matched,
          missingCount: recalculateMissingCount(matched),
        }
      }
      return recipe
    })

    return NextResponse.json({ recipes: processedRecipes })
  } catch (error) {
    console.error("GET /api/recipes error:", error)
    return NextResponse.json(
      { error: "Internal server error" },
      { status: 500 }
    )
  }
}

export async function POST(request: Request) {
  try {
    const session = await auth()
    if (!session?.user?.id) {
      return NextResponse.json({ error: "Unauthorized" }, { status: 401 })
    }

    const body = await request.json()
    const parsed = recipeCreateSchema.safeParse(body)

    if (!parsed.success) {
      return NextResponse.json(
        { error: "Validation failed", issues: parsed.error.issues },
        { status: 400 }
      )
    }

    // sourceDrinkId comes from the client and is a foreign key onto Drink. Without
    // this check a user could attach a recipe to someone else's drink, where it
    // would render on their drink page and they could not delete it.
    if (parsed.data.sourceDrinkId) {
      const ownsDrink = await prisma.drink.findFirst({
        where: { id: parsed.data.sourceDrinkId, userId: session.user.id },
        select: { id: true },
      })
      if (!ownsDrink) {
        return NextResponse.json({ error: "Drink not found" }, { status: 404 })
      }
    }

    const recipe = await prisma.recipe.create({
      data: {
        userId: session.user.id,
        title: parsed.data.title,
        ingredients: parsed.data.ingredients as unknown as Prisma.InputJsonValue,
        steps: parsed.data.steps as unknown as Prisma.InputJsonValue,
        garnish: parsed.data.garnish || null,
        glassware: parsed.data.glassware || null,
        sourceDrinkId: parsed.data.sourceDrinkId || null,
        notes: parsed.data.notes || null,
      },
    })

    return NextResponse.json(recipe, { status: 201 })
  } catch (error) {
    console.error("POST /api/recipes error:", error)
    return NextResponse.json(
      { error: "Internal server error" },
      { status: 500 }
    )
  }
}