feat: 第一版可用 pokemon

packages/pokemon/src/core/gender.ts

@@ -0,0 +1,26 @@
+import type { Gender, SpeciesData } from '../types'
+
+/**
+ * Determine gender based on species gender ratio.
+ * genderRate: -1 = genderless, 0 = always male, 1-7 = female chance = genderRate/8, 8 = always female
+ */
+export function determineGender(speciesData: SpeciesData, seed: number): Gender {
+	if (speciesData.genderRate === -1) return 'genderless'
+	if (speciesData.genderRate === 0) return 'male'
+	if (speciesData.genderRate === 8) return 'female'
+	// Use seed value (0-255) to determine gender
+	const threshold = (speciesData.genderRate / 8) * 256
+	return (seed % 256) < threshold ? 'female' : 'male'
+}
+
+/** Get gender symbol for display */
+export function getGenderSymbol(gender: Gender): string {
+	switch (gender) {
+		case 'male':
+			return '♂'
+		case 'female':
+			return '♀'
+		case 'genderless':
+			return ''
+	}
+}