feat: 第一版可用 pokemon

packages/pokemon/src/core/evolution.ts

@@ -0,0 +1,46 @@
+import type { Creature, EvolutionResult, SpeciesId } from '../types'
+import { SPECIES_DATA } from '../data/species'
+import { getNextEvolution } from '../data/evolution'
+
+/**
+ * Check if a creature meets evolution conditions.
+ * Returns the evolution result if evolution should occur, null otherwise.
+ */
+export function checkEvolution(creature: Creature): EvolutionResult | null {
+	if (creature.level > 100) return null
+
+	const nextEvo = getNextEvolution(creature.speciesId)
+	if (!nextEvo) return null
+
+	// Check level-up conditions
+	if (nextEvo.trigger === 'level_up' && creature.level >= nextEvo.minLevel) {
+		return {
+			from: creature.speciesId,
+			to: nextEvo.to,
+			newLevel: creature.level,
+		}
+	}
+
+	return null
+}
+
+/**
+ * Execute evolution on a creature.
+ * Returns the updated creature with new species and recalculated data.
+ */
+export function evolve(creature: Creature, targetSpeciesId: SpeciesId): Creature {
+	const newSpecies = SPECIES_DATA[targetSpeciesId]
+
+	return {
+		...creature,
+		speciesId: targetSpeciesId,
+		friendship: Math.min(255, creature.friendship + 10), // Evolution boosts friendship
+	}
+}
+
+/**
+ * Check if a species can evolve further.
+ */
+export function canEvolveFurther(speciesId: SpeciesId): boolean {
+	return getNextEvolution(speciesId) !== undefined
+}