From 7502663b4c640908a073efeea1bcc7064c41cc1f Mon Sep 17 00:00:00 2001
From: Alex Lanz <alex.lanz@aboutbits.it>
Date: Wed, 26 May 2021 13:59:55 +0200
Subject: [PATCH] Embedding the configuraitons into an configuraitons object

---
 readme.md                                         |  4 +++-
 src/__test__/pagination-with-first-page-0.test.ts | 13 ++++++++-----
 src/__test__/pagination-with-first-page-1.test.ts |  4 +++-
 src/index.ts                                      |  9 +++++++--
 4 files changed, 21 insertions(+), 9 deletions(-)

diff --git a/readme.md b/readme.md
index 1d62e16..0aac788 100644
--- a/readme.md
+++ b/readme.md
@@ -24,7 +24,9 @@ Second, you can call the calculate function by passing the following information
 - `page`: The current page
 - `size`: The amount of items shown per page
 - `total`: The amount of total items in the list/collection
-- `maxPages`: The maximum amount of pages that should be shown (default: 5)
+- `config`: A configuration object containing the following possible configuration values:
+  - `firstPage`: The first page of the pagination (default: 1)
+  - `maxPages`: The maximum amount of pages that should be shown (default: 5)
 
 In return, you receive an object with all relevant information:
 
diff --git a/src/__test__/pagination-with-first-page-0.test.ts b/src/__test__/pagination-with-first-page-0.test.ts
index ae8a0fc..f450b50 100644
--- a/src/__test__/pagination-with-first-page-0.test.ts
+++ b/src/__test__/pagination-with-first-page-0.test.ts
@@ -4,7 +4,7 @@ it('should return no pagination if not enough items are given', () => {
   const page = 0
   const size = 5
   const total = 2
-  const pagination = calculatePagination(page, size, total, 5, 0)
+  const pagination = calculatePagination(page, size, total, { firstPage: 0 })
 
   expect(pagination).toBeNull()
 })
@@ -12,7 +12,7 @@ it('should return only a few pages', () => {
   const page = 1
   const size = 5
   const total = 15
-  const pagination = calculatePagination(page, size, total, 5, 0)
+  const pagination = calculatePagination(page, size, total, { firstPage: 0 })
 
   expect(pagination).not.toBeNull()
   expect(pagination?.pages).toHaveLength(3)
@@ -29,7 +29,10 @@ it('should return the maximum number of pages', () => {
   const size = 5
   const total = 50
   const maxPages = 5
-  const pagination = calculatePagination(page, size, total, maxPages, 0)
+  const pagination = calculatePagination(page, size, total, {
+    firstPage: 0,
+    maxPages: maxPages,
+  })
 
   expect(pagination).not.toBeNull()
   expect(pagination?.pages).toHaveLength(5)
@@ -49,7 +52,7 @@ it('should disable the previous link', () => {
   const page = 0
   const size = 5
   const total = 10
-  const pagination = calculatePagination(page, size, total, 5, 0)
+  const pagination = calculatePagination(page, size, total, { firstPage: 0 })
 
   expect(pagination).not.toBeNull()
 
@@ -66,7 +69,7 @@ it('should disable the next link', () => {
   const page = 1
   const size = 5
   const total = 10
-  const pagination = calculatePagination(page, size, total, 5, 0)
+  const pagination = calculatePagination(page, size, total, { firstPage: 0 })
 
   expect(pagination).not.toBeNull()
 
diff --git a/src/__test__/pagination-with-first-page-1.test.ts b/src/__test__/pagination-with-first-page-1.test.ts
index c66e582..33f3879 100644
--- a/src/__test__/pagination-with-first-page-1.test.ts
+++ b/src/__test__/pagination-with-first-page-1.test.ts
@@ -29,7 +29,9 @@ it('should return the maximum number of pages', () => {
   const size = 5
   const total = 50
   const maxPages = 5
-  const pagination = calculatePagination(page, size, total, maxPages)
+  const pagination = calculatePagination(page, size, total, {
+    maxPages: maxPages,
+  })
 
   expect(pagination).not.toBeNull()
   expect(pagination?.pages).toHaveLength(5)
diff --git a/src/index.ts b/src/index.ts
index 466113d..b5f3436 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -47,8 +47,10 @@ const calculatePagination = (
   page: number,
   size: number,
   total: number,
-  maxPages = 5,
-  firstPage = 1
+  config?: {
+    firstPage?: number
+    maxPages?: number
+  }
 ): {
   previous: {
     number: number
@@ -67,6 +69,9 @@ const calculatePagination = (
     return null
   }
 
+  const firstPage = config?.firstPage ?? 1
+  const maxPages = config?.maxPages ?? 5
+
   const lastPage = Math.ceil(total / size) + (firstPage - 1)
   const isCurrentTheFirstPage = page === firstPage
   const isCurrentTheLastPage = page === lastPage