From c9f43581d390fe97648790ef0d892fb4dfdfabd8 Mon Sep 17 00:00:00 2001
From: ClarkeCode <clarke.john.robert@gmail.com>
Date: Tue, 4 Apr 2023 22:12:15 -0400
Subject: Proposal for scoped effects

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+# Effects and their Scopes
+> **Warning**
+> The following document is ***not in a finished state***
+
+## Effects
+In creating a dynamic game, we need a way to express changes in the game-world. These changes are an `Effect`
+
+```mermaid
+flowchart LR
+	A[Game State] --> |Effect| B[New Game State]
+```
+
+An `Effect` contains one or more `statements` or `Effects`. A `statement` represents a change to a single attribute.
+
+However, how do we know what attributes are available to change?
+
+## The Five Fundementals
+To know what attributes can be changed, we will specify the type of item that we wish to modify.
+
+There are five fundemental categories of items which a modder would be interested in changing:
+- `Nation`
+- `Province`
+- `Pop`
+- `Good`
+- `Unit`
+
+
+## Scoped Effects
+To narrow an effect to specific instances of an item, we specify the `target category`, followed by the `where` keyword along with a `scope condition`. This would apply the effect statements to all items belonging to the `target category` where the `scope condition` evaluates to `true`.
+
+For example, the following scoped effect would increase the prestige and money of all nations who had a literacy rate above 70%:
+```
+Nation where (literacy > 70) {
+	prestige += 5
+	money += 1000
+}
+```
+
+## Multiple Scopes
+In order to achieve more granular control over effects, use nested scopes.
+
+This effect turns all Irish fish provinces into gold mines:
+```
+Nation where (nationId == "Ireland") {
+	Province where (tradeGood == "fish") {
+		tradeGood = "precious_metal"
+	}
+}
+```
+<!-- 
+```
+Nation where (nationId == "Ireland") with Province where (tradeGood == "fish") {
+	tradeGood = "precious_metal"
+}
+```
+-->
+
+All fundemental items are valid scopes. The nested scopes which are allowed are within the following table:
+| Scopes                     | Meaning                              |
+|----------------------------|--------------------------------------|
+| Nation                     | All Nations that satisfy condition   |
+| Province                   | All Provinces that satisfy condition |
+| Pop                        | All Pops that satisfy condition      |
+| Good                       | All Goods that satisfy condition     |
+| Unit                       | All Units that satisfy condition     |
+| Nation -> Province         | All Provinces that are X within Nations that are Y |
+| Nation -> Pop              | All Pops that are X within Nations that are Y |
+| Nation -> Unit             | All Units that are X within Nations that are Y |
+| Nation -> Province -> Pop  | All Pops that are X within Provinces that are Y within Nations that are Z |
+| Province -> Pop            | All Pops that are X within Provinces that are Y |
+
+
+## Further Examples
+
+### Increase the fort level by one in provinces that have a level 0 or 1 fort and reduce the conciousness of the soldier pops within those provinces
+```
+Province where fortLevel < 2 {
+	fortLevel += 1
+	Pop where (popType == "soldier") {
+		conciousness -= 1
+	}
+}
+```
+
+### Raise the base price of Machine Parts
+```
+Good where (goodId == "machine_parts") {
+	basePrice += 1.5
+}
+```
+
+### Turn all Irregular units into Guards for Russia and Poland
+```
+Nation where (nationId == "Russia" or nationId == "Poland") {
+	Unit where (unitType == "Irregular") {
+		unitType = "Guard"
+	}
+}
+```
+
+### For France: Recieve £250, triple the speed of Cavalry and Dragoons, and increase the number of clerks by 10 in occupied provinces
+```
+Nation where nationId == "France" {
+	money += 250
+	Unit where unitType == "Cavalry" or unitType == "Dragoons" {
+		speed *= 3
+	}
+	Province where controllingNation == "France" and owningNation != "France" {
+		Pop where popType == "Clerk" {
+			size += 10
+		}
+	}
+
+}
+```
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