From 3b22bfcc37c0ba14aabc983346ba03a1ae9fc7d4 Mon Sep 17 00:00:00 2001
From: Stefan Harmuth <stefan.harmuth@docomodigital.com>
Date: Sat, 16 Jan 2021 15:46:32 +0100
Subject: [PATCH] day22 - working fight simulation

---
 day22/day.go | 70 +++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 47 insertions(+), 23 deletions(-)

diff --git a/day22/day.go b/day22/day.go
index 7448ce6..311cf10 100644
--- a/day22/day.go
+++ b/day22/day.go
@@ -2,6 +2,7 @@ package day22
 
 import (
 	"fmt"
+	"math"
 	"strconv"
 	"strings"
 	"tools"
@@ -14,10 +15,12 @@ type Effect struct {
 	timer  int
 }
 
-func (e Effect) copy() Effect {
-	return Effect{e.damage, e.armor, e.mana, e.timer}
+func (e Effect) copy() *Effect {
+	return &Effect{e.damage, e.armor, e.mana, e.timer}
 }
 
+var activeEffects map[string]*Effect
+
 type Spell struct {
 	cost        int
 	damage      int
@@ -26,15 +29,14 @@ type Spell struct {
 }
 
 type Entity struct {
-	hitpoints      int
-	mana           int
-	damage         int
-	armor          int
-	currentEffects map[string]Effect
+	hitpoints int
+	mana      int
+	damage    int
+	armor     int
 }
 
-func (e Entity) copy() Entity {
-	return Entity{e.hitpoints, e.mana, e.damage, e.armor, e.currentEffects}
+func (e Entity) copy() *Entity {
+	return &Entity{e.hitpoints, e.mana, e.damage, e.armor}
 }
 
 func (e Entity) printStats() {
@@ -50,36 +52,45 @@ var spells = map[string]Spell{
 }
 
 func applyEffects(player, boss *Entity) {
-	for eName, eData := range player.currentEffects {
+	for eName, eData := range activeEffects {
 		switch eName {
 		case "Shield":
 			if eData.timer == spells["Shield"].applyEffect.timer {
+				fmt.Println("Apply Shield")
 				player.armor += eData.armor
 			} else if eData.timer == 1 {
+				fmt.Println("Remove Shield")
 				player.armor -= eData.armor
 			}
 		case "Recharge":
+			fmt.Println("Regen Mana")
 			player.mana += eData.mana
-		}
-		eData.timer--
-	}
-	for eName, eData := range boss.currentEffects {
-		switch eName {
 		case "Poison":
+			fmt.Println("Apply Poison")
 			boss.hitpoints -= eData.damage
 		}
-		eData.timer--
+		activeEffects[eName].timer--
+		if eData.timer == 0 {
+			fmt.Println(eName, "wears off.")
+			delete(activeEffects, eName)
+		}
 	}
 }
 
-func fightRound(player, boss *Entity, spell Spell) (outcome int) {
+func fightRound(player, boss *Entity, spellName string) (outcome int) {
 	// outcome will be -1 on boss win, 0 on both living and 1 on player win
+	spell := spells[spellName]
 
 	applyEffects(player, boss)
 	if player.mana < spell.cost {
 		return -1
 	}
-	// cast spell
+	player.mana -= spell.cost
+	player.hitpoints += spell.heal
+	boss.hitpoints -= spell.damage
+	if _, ok := activeEffects[spellName]; !ok && spell.applyEffect.timer > 0 {
+		activeEffects[spellName] = spell.applyEffect.copy()
+	}
 
 	if boss.hitpoints <= 0 {
 		return 1
@@ -97,9 +108,17 @@ func fightRound(player, boss *Entity, spell Spell) (outcome int) {
 	return 0
 }
 
+func minManaToTheDeath(player, boss *Entity) int {
+	manaUsed := 0
+	minManaUsed := math.MaxInt64
+
+	return manaUsed
+}
+
 func Part1(puzzle tools.AoCPuzzle) interface{} {
-	player := Entity{50, 500, 0, 0, make(map[string]Effect)}
-	boss := Entity{0, 0, 0, 0, make(map[string]Effect)}
+	activeEffects = make(map[string]*Effect)
+	player := Entity{50, 500, 0, 0}
+	boss := Entity{0, 0, 0, 0}
 	bossdata := puzzle.GetInputArray()
 	for _, line := range bossdata {
 		parts := strings.Split(line, ": ")
@@ -110,11 +129,16 @@ func Part1(puzzle tools.AoCPuzzle) interface{} {
 			boss.damage, _ = strconv.Atoi(parts[1])
 		}
 	}
+
 	player.printStats()
 	boss.printStats()
-	fightRound(&player, &boss, spells["Magic Missile"])
-	player.printStats()
-	boss.printStats()
+	fmt.Println("-----")
+	for _, s := range []string{"Recharge", "Shield", "Drain", "Poison", "Magic Missile"} {
+		fightRound(&player, &boss, s)
+		player.printStats()
+		boss.printStats()
+		fmt.Println("-----")
+	}
 
 	return 0
 }