import { apiRequestData } from "./http";

export type BudgetScopeType = "global" | "department_legacy" | "cost_center_scoped" | "invalid";

export type BudgetPool = {
  id: string;
  code: string;
  name: string;
  scopeType: BudgetScopeType;
  departmentId: string | null;
  legalEntityId: string | null;
  costCenterId: string | null;
  department: {
    id: string;
    name: string;
  } | null;
  legalEntity: {
    id: string;
    code: string;
    name: string;
  } | null;
  costCenter: {
    id: string;
    code: string;
    name: string;
    legalEntityId: string;
  } | null;
  status: "active" | "archived";
  periodStart: string | null;
  periodEnd: string | null;
  allocatedAmount: string;
  usedAmount: string;
  remainingAmount: string;
  warningThresholdPercent: number;
  archivedAt: string | null;
  createdAt: string | null;
  updatedAt: string | null;
};

export type BudgetListResponse = {
  page: number;
  pageSize: number;
  total: number;
  items: BudgetPool[];
};

export type BudgetListQuery = {
  status?: "active" | "archived";
  departmentId?: string;
  legalEntityId?: string;
  costCenterId?: string;
  page?: number;
  pageSize?: number;
};

function toQueryString(query: Record<string, string | number | undefined>) {
  const params = new URLSearchParams();
  for (const [key, value] of Object.entries(query)) {
    if (value == null || value === "") {
      continue;
    }
    params.set(key, String(value));
  }
  const encoded = params.toString();
  return encoded ? `?${encoded}` : "";
}

export async function fetchBudgets(query: BudgetListQuery = {}) {
  return apiRequestData<BudgetListResponse>(`/api/budgets${toQueryString(query as Record<string, string | number | undefined>)}`);
}

export async function createBudget(payload: {
  code: string;
  name: string;
  departmentId?: string | null;
  legalEntityId?: string | null;
  costCenterId?: string | null;
  periodStart: string;
  periodEnd: string;
  allocatedAmount: string;
  warningThresholdPercent?: number;
}) {
  return apiRequestData<BudgetPool>(`/api/budgets`, {
    method: "POST",
    body: JSON.stringify(payload),
  });
}

export async function updateBudget(
  budgetId: string,
  payload: Partial<{
    name: string;
    allocatedAmount: string;
    warningThresholdPercent: number;
    status: "active" | "archived";
  }>,
) {
  return apiRequestData<BudgetPool>(`/api/budgets/${budgetId}`, {
    method: "PATCH",
    body: JSON.stringify(payload),
  });
}

export async function archiveBudget(budgetId: string) {
  return apiRequestData<BudgetPool>(`/api/budgets/${budgetId}/archive`, {
    method: "POST",
    body: JSON.stringify({}),
  });
}