"use server"

import { revalidatePath } from "next/cache"

import prisma from "@/lib/prisma"
import {
  CreateItemFormType,
  createItemSchema,
  UpdateItemFormType,
  updateItemSchema,
} from "@/lib/schemas/item.schemas"
import { getAuthenticatedUserId } from "@/services/auth.service"
import { ItemService } from "@/services/item.service"

export async function createItemAction(formData: CreateItemFormType) {
  const validatedFields = createItemSchema.safeParse(formData)

  if (!validatedFields.success) {
    return {
      errors: validatedFields.error.flatten().fieldErrors,
    }
  }

  const { name, categoryId, stock } = validatedFields.data

  if (stock < 0) {
    return {
      success: false,
      errors: {
        stock: ["Stock cannot be negative"],
      },
    }
  }

  try {
    const existingItem = await ItemService.findByName(name)

    if (existingItem) {
      return {
        success: false,
        errors: {
          name: ["An item with this name already exists"],
        },
      }
    }

    const item = await ItemService.create({
      name,
      category: { connect: { id: categoryId } },
      stock: stock || 0,
    })

    if (stock > 0) {
      await prisma.movement.create({
        data: {
          type: "IN",
          itemId: item.id,
          userId: await getAuthenticatedUserId(),
          quantity: stock,
        },
      })
    }

    revalidatePath("/inventory/items")

    return {
      success: true,
      message: "Item created successfully!",
    }
  } catch (error) {
    console.error("Database error:", error)
    return {
      error: "Error creating item",
    }
  }
}

export async function updateItemAction(formData: UpdateItemFormType) {
  const validatedFields = updateItemSchema.safeParse(formData)

  if (!validatedFields.success) {
    return {
      errors: validatedFields.error.flatten().fieldErrors,
    }
  }

  const { id, stock, name, categoryId } = validatedFields.data

  try {
    const existingItem = await ItemService.findByIdWithAssetCount(id)

    if (!existingItem) {
      return {
        success: false,
        errors: {
          id: ["Item not found"],
        },
      }
    }

    const existingItemByName = await ItemService.findByName(name)

    if (existingItemByName && existingItemByName.id !== id) {
      return {
        success: false,
        errors: { name: ["An item with this name already exists"] },
      }
    }

    await ItemService.update(id, {
      stock: stock || existingItem.stock,
      name: name || existingItem.name,
      category: { connect: { id: categoryId } },
    })

    const quantity = stock - existingItem.stock

    if (stock && stock > existingItem.stock) {
      await prisma.movement.create({
        data: {
          type: "IN",
          itemId: id,
          quantity,
          userId: await getAuthenticatedUserId(),
        },
      })
    }

    return {
      success: true,
      message: "Item updated successfully!",
    }
  } catch (error) {
    console.error("Database error:", error)
    return {
      error: "Failed to update item",
    }
  }
}

export async function deleteItemAction(formData: FormData) {
  const { id } = Object.fromEntries(formData) as { id: string }

  try {
    const existingItem = await ItemService.findByIdWithAssetCount(id)

    if (!existingItem) {
      return {
        success: false,
        errors: { id: ["Item not found"] },
      }
    }

    if (existingItem._count.assets > 0) {
      return {
        success: false,
        errors: { id: ["Item has assets, you cannot delete it"] },
      }
    }

    if (existingItem.stock > 0) {
      return {
        success: false,
        errors: { id: ["Item has stock, you cannot delete it"] },
      }
    }

    await ItemService.delete(id)

    revalidatePath("/inventory/items")

    return {
      success: true,
      message: "Item deleted successfully!",
    }
  } catch (error) {
    console.error("Database error:", error)
    return {
      error: "Failed to delete item",
    }
  }
}