From 78363514b51a66fe23f8fdca1056dd37c986031b Mon Sep 17 00:00:00 2001
From: Ilya Semenov <semenov@inetss.com>
Date: Mon, 27 Dec 2021 15:35:21 +0700
Subject: [PATCH] feat: integration with grammy-pseudo-update

---
 README.md                    | 39 ++++++++++++++++++++++++++++++++++++
 package.json                 | 38 ++++++++++++++++++++++++++++-------
 src/contrib/pseudo-update.ts | 39 ++++++++++++++++++++++++++++++++++++
 tsconfig.json                |  3 ++-
 tsup.config.ts               |  2 +-
 yarn.lock                    |  5 +++++
 6 files changed, 117 insertions(+), 9 deletions(-)
 create mode 100644 src/contrib/pseudo-update.ts

diff --git a/README.md b/README.md
index d71698d..30668a0 100644
--- a/README.md
+++ b/README.md
@@ -237,3 +237,42 @@ await ctx.scenes.continue(token, { result: 123 })
 ```
 
 If the scene has moved on, this will be silently ignored.
+
+### Integration with `grammy-pseudo-update`
+
+In the "continue" example above, the imaginary external handler is supposed to somehow keep a reference to `ctx`.
+
+In real world, that is not always possible. The continuation request could come from e.g. message queue processor or a HTTP server.
+
+To achieve that, `grammy-scenes` provides integration with [grammy-pseudo-update](https://github.com/IlyaSemenov/grammy-pseudo-update):
+
+```ts
+import { scenesPseudoUpdate } from "grammy-scenes/pseudo-update"
+
+// ...
+
+bot.use(scenes)
+bot.use(scenesPseudoUpdate)
+
+on_external_event(({ chat_id, token, arg }) => {
+	bot.handlePseudoUpdate({
+		chat_id,
+		payload: {
+			scenes: { _: "continue", token, arg },
+		},
+	})
+})
+
+bot.start()
+```
+
+Similarly, it's possible to "enter" a scene with:
+
+```ts
+bot.handlePseudoUpdate({
+	chat_id,
+	payload: {
+		scenes: { _: "enter", scene, arg },
+	},
+})
+```
diff --git a/package.json b/package.json
index dd478cb..dba5b7a 100644
--- a/package.json
+++ b/package.json
@@ -12,6 +12,23 @@
   "module": "dist/index.mjs",
   "types": "dist/index.d.ts",
   "source": "src/index.ts",
+  "exports": {
+    ".": {
+      "require": "./dist/index.js",
+      "import": "./dist/index.mjs"
+    },
+    "./pseudo-update": {
+      "require": "./dist/contrib/pseudo-update.js",
+      "import": "./dist/contrib/pseudo-update.mjs"
+    }
+  },
+  "typesVersions": {
+    "*": {
+      "pseudo-update": [
+        "dist/contrib/pseudo-update"
+      ]
+    }
+  },
   "files": [
     "dist",
     "src",
@@ -24,6 +41,19 @@
     "lint": "eslint --fix '**/*.{js,ts}'",
     "prepare": "husky install"
   },
+  "dependencies": {
+    "ts-essentials": "^9.1.0",
+    "uuid": "^8.3.2"
+  },
+  "peerDependencies": {
+    "grammy": "^1.5.4",
+    "grammy-pseudo-update": "^1.0.0"
+  },
+  "peerDependenciesMeta": {
+    "grammy-pseudo-update": {
+      "optional": true
+    }
+  },
   "devDependencies": {
     "@commitlint/cli": "^15.0.0",
     "@commitlint/config-conventional": "^15.0.0",
@@ -39,18 +69,12 @@
     "eslint-plugin-prettier": "^4.0.0",
     "eslint-plugin-simple-import-sort": "^7.0.0",
     "grammy": "^1.5.4",
+    "grammy-pseudo-update": "^1.0.0",
     "husky": ">=6",
     "lint-staged": ">=10",
     "prettier": "^2.1.2",
     "tap": "^15.1.5",
     "tsup": "^5.11.9",
     "typescript": "^4.0.5"
-  },
-  "peerDependencies": {
-    "grammy": "^1.5.4"
-  },
-  "dependencies": {
-    "ts-essentials": "^9.1.0",
-    "uuid": "^8.3.2"
   }
 }
diff --git a/src/contrib/pseudo-update.ts b/src/contrib/pseudo-update.ts
new file mode 100644
index 0000000..a4f96e4
--- /dev/null
+++ b/src/contrib/pseudo-update.ts
@@ -0,0 +1,39 @@
+import "grammy-pseudo-update"
+
+import { MiddlewareFn } from "grammy"
+import { ScenesFlavoredContext } from "grammy-scenes"
+
+declare module "grammy-pseudo-update" {
+	interface PseudoUpdatePayload {
+		scenes?:
+			| {
+					_: "enter"
+					scene: string
+					arg?: any
+			  }
+			| {
+					_: "continue"
+					token: string
+					arg?: any
+			  }
+	}
+}
+
+export const scenesPseudoUpdate: MiddlewareFn<ScenesFlavoredContext> = async (
+	ctx,
+	next
+) => {
+	const payload = ctx.pseudo?.scenes
+	if (payload) {
+		switch (payload._) {
+			case "enter":
+				await ctx.scenes.enter(payload.scene, payload.arg)
+				break
+			case "continue":
+				await ctx.scenes.continue(payload.token, payload.arg)
+				break
+		}
+		return
+	}
+	return next()
+}
diff --git a/tsconfig.json b/tsconfig.json
index 7570eba..e83c556 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -3,7 +3,8 @@
 	"include": ["src", "tests"],
 	"compilerOptions": {
 		"paths": {
-			"grammy-scenes": ["./src"]
+			"grammy-scenes": ["./src"],
+			"grammy-scenes/pseudo-update": ["./src/contrib/pseudo-update"]
 		}
 	}
 }
diff --git a/tsup.config.ts b/tsup.config.ts
index 887dfb3..6ea7a52 100644
--- a/tsup.config.ts
+++ b/tsup.config.ts
@@ -2,7 +2,7 @@ import { defineConfig } from "tsup"
 
 export default defineConfig({
 	clean: true,
-	entry: ["src/index.ts"],
+	entry: ["src/index.ts", "src/contrib/pseudo-update.ts"],
 	format: ["cjs", "esm"],
 	sourcemap: true,
 	dts: true,
diff --git a/yarn.lock b/yarn.lock
index 3530d08..327771c 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1904,6 +1904,11 @@ graceful-fs@^4.1.15, graceful-fs@^4.1.6, graceful-fs@^4.2.0:
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.2.8.tgz#e412b8d33f5e006593cbd3cee6df9f2cebbe802a"
   integrity sha512-qkIilPUYcNhJpd33n0GBXTB1MMPp14TxEsEs0pTrsSVucApsYzW5V+Q8Qxhik6KU3evy+qkAAowTByymK0avdg==
 
+grammy-pseudo-update@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/grammy-pseudo-update/-/grammy-pseudo-update-1.0.0.tgz#4ff145a292ab7697b9fe3ba5a52b3b6866d67be0"
+  integrity sha512-SQcAKG+UmnikDkApCVYOLPXpXTDr3fWFp6s402pVr+x7oxgj/4nzJRnZ8KVbGxhnXdTGOTo5RvnuqqN5Qsdhyg==
+
 grammy@^1.5.4:
   version "1.5.4"
   resolved "https://registry.yarnpkg.com/grammy/-/grammy-1.5.4.tgz#0c2915626edcb23fb20dc52a09b21ae1fe788d25"