From 32f0770f65a60698c2b23968a1946b40feb1abec Mon Sep 17 00:00:00 2001
From: Allan Crisostomo <allan.crisostomo@whitecloak.com>
Date: Mon, 30 Nov 2020 16:26:18 +0800
Subject: [PATCH] Add data namespace

Data namespace includes access and datetime functions.
---
 src/data/access.ts   | 13 +++++++
 src/data/datetime.ts | 81 ++++++++++++++++++++++++++++++++++++++++++++
 src/plugin.ts        | 10 +++++-
 3 files changed, 103 insertions(+), 1 deletion(-)
 create mode 100644 src/data/access.ts
 create mode 100644 src/data/datetime.ts

diff --git a/src/data/access.ts b/src/data/access.ts
new file mode 100644
index 0000000..201499b
--- /dev/null
+++ b/src/data/access.ts
@@ -0,0 +1,13 @@
+export enum Access {
+  'note:read' = 1,
+  'note:write' = 2,
+  'note:delete' = 3,
+  'note:import' = 4,
+  'note:export' = 5,
+  'folder:read' = 7,
+  'folder:write' = 8,
+  'social:publish' = 9,
+  'social:unpublish' = 10,
+  'social:share' = 11,
+  'userinfo:manage' = 12,
+}
diff --git a/src/data/datetime.ts b/src/data/datetime.ts
new file mode 100644
index 0000000..132c6cd
--- /dev/null
+++ b/src/data/datetime.ts
@@ -0,0 +1,81 @@
+export enum TimeDivision {
+  MILLISECONDS,
+  SECONDS,
+  MINUTES,
+  HOURS,
+  DAYS
+}
+
+type GetTimeDifference = (a: Date, b: Date) => (c: TimeDivision) => number
+
+export const getTimeDifference: GetTimeDifference = (a, b) => {
+  const ms = b.getTime() - a.getTime()
+  const absoluteMs = ms < 0 ? -ms : ms
+
+  return c => {
+    let divisionDifference = absoluteMs
+    if (c === TimeDivision.MILLISECONDS) {
+      return divisionDifference
+    }
+
+    divisionDifference /= 1000
+    if (c === TimeDivision.SECONDS) {
+      return divisionDifference
+    }
+
+    divisionDifference /= 60
+    if (c === TimeDivision.MINUTES) {
+      return divisionDifference
+    }
+
+    divisionDifference /= 60
+    if (c === TimeDivision.HOURS) {
+      return divisionDifference
+    }
+
+    divisionDifference /= 24
+    if (c === TimeDivision.DAYS) {
+      return divisionDifference
+    }
+
+    throw new Error('Unknown time division.')
+  }
+}
+
+type AddTime = (refDate: Date, increment: number) => (c: TimeDivision) => Date
+
+export const addTime: AddTime = (refDate, increment) => {
+  const futureDate = new Date(refDate.getTime())
+  return c => {
+    let msIncrement = increment
+    if (c === TimeDivision.MILLISECONDS) {
+      futureDate.setMilliseconds(futureDate.getMilliseconds() + msIncrement)
+      return futureDate
+    }
+
+    msIncrement *= 1000
+    if (c === TimeDivision.SECONDS) {
+      futureDate.setMilliseconds(futureDate.getMilliseconds() + msIncrement)
+      return futureDate
+    }
+
+    msIncrement *= 60
+    if (c === TimeDivision.MINUTES) {
+      futureDate.setMilliseconds(futureDate.getMilliseconds() + msIncrement)
+      return futureDate
+    }
+
+    msIncrement *= 60
+    if (c === TimeDivision.HOURS) {
+      futureDate.setMilliseconds(futureDate.getMilliseconds() + msIncrement)
+      return futureDate
+    }
+
+    msIncrement *= 24
+    if (c === TimeDivision.DAYS) {
+      futureDate.setMilliseconds(futureDate.getMilliseconds() + msIncrement)
+      return futureDate
+    }
+    throw new Error('Unknown time division.')
+  }
+}
diff --git a/src/plugin.ts b/src/plugin.ts
index 0e7ef4a..304e2c3 100644
--- a/src/plugin.ts
+++ b/src/plugin.ts
@@ -2,4 +2,12 @@ export type State = {
   currentUserId: string,
 }
 
-export type Plugin<T = {}> = (config: T) => (state: State) => void
+export interface StoragePlugin {
+  save(collectionId: string, item: unknown): Promise<unknown>
+  load(collectionId: string, itemId?: unknown): Promise<unknown>
+  remove(collectionId: string, item: unknown): Promise<unknown>
+}
+
+type StoragePluginConstructor = new (state: State) => StoragePlugin
+
+export type Plugin<T = {}> = (config?: T) => StoragePluginConstructor