"use client"

import type { BankingData, Account, Transaction, Folder, Category } from "./types"

const API_BASE = "/api/banking"

export async function loadData(): Promise<BankingData> {
  const response = await fetch(API_BASE)
  if (!response.ok) {
    throw new Error("Failed to load data")
  }
  return response.json()
}

export async function addAccount(account: Omit<Account, "id">): Promise<Account> {
  const response = await fetch(`${API_BASE}/accounts`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(account),
  })
  if (!response.ok) {
    throw new Error("Failed to add account")
  }
  return response.json()
}

export async function updateAccount(account: Account): Promise<Account> {
  const response = await fetch(`${API_BASE}/accounts`, {
    method: "PUT",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(account),
  })
  if (!response.ok) {
    throw new Error("Failed to update account")
  }
  return response.json()
}

export async function deleteAccount(accountId: string): Promise<void> {
  const response = await fetch(`${API_BASE}/accounts?id=${accountId}`, {
    method: "DELETE",
  })
  if (!response.ok) {
    throw new Error("Failed to delete account")
  }
}

export async function addTransactions(transactions: Transaction[]): Promise<{ count: number; transactions: Transaction[] }> {
  const response = await fetch(`${API_BASE}/transactions`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(transactions),
  })
  if (!response.ok) {
    throw new Error("Failed to add transactions")
  }
  return response.json()
}

export async function updateTransaction(transaction: Transaction): Promise<Transaction> {
  const response = await fetch(`${API_BASE}/transactions`, {
    method: "PUT",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(transaction),
  })
  if (!response.ok) {
    throw new Error("Failed to update transaction")
  }
  return response.json()
}

export async function addFolder(folder: Omit<Folder, "id">): Promise<Folder> {
  const response = await fetch(`${API_BASE}/folders`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(folder),
  })
  if (!response.ok) {
    throw new Error("Failed to add folder")
  }
  return response.json()
}

export async function updateFolder(folder: Folder): Promise<Folder> {
  const response = await fetch(`${API_BASE}/folders`, {
    method: "PUT",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(folder),
  })
  if (!response.ok) {
    throw new Error("Failed to update folder")
  }
  return response.json()
}

export async function deleteFolder(folderId: string): Promise<void> {
  const response = await fetch(`${API_BASE}/folders?id=${folderId}`, {
    method: "DELETE",
  })
  if (!response.ok) {
    throw new Error("Failed to delete folder")
  }
}

export async function addCategory(category: Omit<Category, "id">): Promise<Category> {
  const response = await fetch(`${API_BASE}/categories`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(category),
  })
  if (!response.ok) {
    throw new Error("Failed to add category")
  }
  return response.json()
}

export async function updateCategory(category: Category): Promise<Category> {
  const response = await fetch(`${API_BASE}/categories`, {
    method: "PUT",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(category),
  })
  if (!response.ok) {
    throw new Error("Failed to update category")
  }
  return response.json()
}

export async function deleteCategory(categoryId: string): Promise<void> {
  const response = await fetch(`${API_BASE}/categories?id=${categoryId}`, {
    method: "DELETE",
  })
  if (!response.ok) {
    throw new Error("Failed to delete category")
  }
}

// Auto-categorize a transaction based on keywords
export function autoCategorize(description: string, categories: Category[]): string | null {
  const lowerDesc = description.toLowerCase()

  for (const category of categories) {
    for (const keyword of category.keywords) {
      if (lowerDesc.includes(keyword.toLowerCase())) {
        return category.id
      }
    }
  }

  return null
}

export function generateId(): string {
  return `${Date.now()}-${Math.random().toString(36).substr(2, 9)}`
}