Remove penultimate genome slot

I need the last "good" genome, not the second to last one, so instead
thread the original genome (before any mutations) through the required
states so it can be reverted to if a lethal change is made.

3 files changed, 19 insertions, 21 deletions

diff --git a/genome-list.mjs b/genome-list.mjs
index c057d34..8969a8c 100644
--- a/genome-list.mjs
+++ b/genome-list.mjs
@@ -18,14 +18,6 @@ class GenomeList {
 	    return undefined
 	}
     }
-
-    get penultimate() {
-        if (this.genomes.length > 1) {
-            return this.genomes[this.genomes.length - 2]
-        } else {
-            return undefined
-        }
-    }
 }
 
 export default GenomeList
diff --git a/index.html b/index.html
index 66a62fa..3b41efc 100644
--- a/index.html
+++ b/index.html
@@ -74,7 +74,7 @@
           <ul>
             <li>If the mutation caused a change in the amino acid
               being coded, then <button class='kill' disabled=''>kill</button> it and
-              start again with the previous generation.</li>
+              start again with the last successful generation.</li>
 
             <li>Otherwise, <button class='clone' disabled=''>clone</button> this
               genome for the next generation.</li>
diff --git a/rules.mjs b/rules.mjs
index c019de8..9543ee2 100644
--- a/rules.mjs
+++ b/rules.mjs
@@ -73,8 +73,13 @@ class NucleotideSelect {
             return
         }
 
-        this.rules.genomeList.push(this.rules.currentGenome.clone())
-        this.rules.next(new RollForNucleotide(this.rules))
+        this.rules.iterations--
+        if (this.rules.iterations === 0) {
+            this.rules.next(new PrintResults(this.rules))
+        } else {
+            this.rules.genomeList.push(this.rules.currentGenome.clone())
+            this.rules.next(new RollForNucleotide(this.rules))
+        }
     }
 
     handleSelectionChanged(nucleotide, i) {
@@ -126,6 +131,7 @@ class PerformMutation {
         this.rules = rules
 
         this.id = 'perform-mutation'
+        this.originalGenome = this.rules.currentGenome.clone()
     }
 
     enter() {
@@ -183,13 +189,15 @@ class PerformMutation {
             return
         }
 
-        this.rules.next(new SelectAminoAcid(this.rules))
+        this.selectedNucleotide.value = base
+        this.rules.next(new SelectAminoAcid(this.rules, this.originalGenome))
     }
 }
 
 class SelectAminoAcid {
-    constructor(rules) {
+    constructor(rules, originalGenome) {
         this.rules = rules
+        this.originalGenome = originalGenome
 
         this.id ='amino-acid-select'
     }
@@ -199,6 +207,7 @@ class SelectAminoAcid {
         const selector = this.rules.aminoAcidSelector
         this.codon = this.rules.currentGenome.selectedCodon
         this.expected = AminoAcid.codonMap[this.codon.value]
+        console.debug('expected: ', this.expected)
         let x = selector.elt.querySelector('#amino-acid-selector .codon').innerHTML =
             this.codon.value
 
@@ -227,13 +236,14 @@ class SelectAminoAcid {
         const newAminoAcid = new AminoAcid(...this.codon.value.split(''))
         const isLethal = this.codon.aminoAcid.value !== newAminoAcid.value
         this.codon.aminoAcid = newAminoAcid
-        this.rules.next(new MarkAsLethal(this.rules, isLethal))
+        this.rules.next(new MarkAsLethal(this.rules, this.originalGenome, isLethal))
     }
 }
 
 class MarkAsLethal {
-    constructor(rules, isLethal) {
+    constructor(rules, originalGenome, isLethal) {
         this.rules = rules
+        this.originalGenome = originalGenome
         this.isLethal = isLethal
 
         this.id = 'mark-as-lethal'
@@ -288,7 +298,7 @@ class MarkAsLethal {
             this.rules.next(new ShowError(this.rules, this))
             return
         }
-        this.nextGoodState(this.rules.previousGenome)
+        this.nextGoodState(this.originalGenome)
     }
 
     nextGoodState(genome) {
@@ -421,7 +431,7 @@ class Rules {
     }
 
     _debugStartAtSelectLethality() {
-        this.currentState = new MarkAsLethal(this, true)
+        this.currentState = new MarkAsLethal(this, this.currentGenome.clone(), true)
         this.die.value = 15
         const nucleotide = this.currentGenome.nucleotides[15]
         nucleotide.value = 'A'
@@ -438,10 +448,6 @@ class Rules {
         return this.genomeList.last
     }
 
-    get previousGenome() {
-        return this.genomeList.penultimate
-    }
-
     showCurrent() {
         if (this.currentState.id === undefined) {
             return