package generators

import (
	"encoding/json"
	"math/rand"
	"os"
)

type HalflingArrays struct {
	Nm1  []string `json:"nm1"`
	Nm2  []string `json:"nm2"`
	Nm3  []string `json:"nm3"`
	Nm4  []string `json:"nm4"`
	Nm12 []string `json:"nm12"`
	Nm13 []string `json:"nm13"`
}

func LoadHalflingArrays(path string) (HalflingArrays, error) {
	var arrays HalflingArrays
	file, err := os.Open(path)
	if err != nil {
		return arrays, err
	}
	defer file.Close()
	decoder := json.NewDecoder(file)
	err = decoder.Decode(&arrays)
	return arrays, err
}

func HalflingNameFem(arr *HalflingArrays) string {
	rnd := rand.Intn(len(arr.Nm3))
	rnd2 := rand.Intn(len(arr.Nm4))
	return arr.Nm3[rnd] + arr.Nm4[rnd2]
}

func HalflingNameMas(arr *HalflingArrays, swearFilter func(string) bool) string {
	rnd := rand.Intn(len(arr.Nm1))
	rnd2 := rand.Intn(len(arr.Nm2))
	nMs := arr.Nm1[rnd] + arr.Nm2[rnd2]
	if swearFilter == nil || !swearFilter(nMs) {
		return nMs
	}
	return ""
}

func GenerateHalflingNames(arr *HalflingArrays, gender string, swearFilter func(string) bool) []string {
	names := make([]string, 0, 10)
	nm12 := make([]string, len(arr.Nm12))
	nm13 := make([]string, len(arr.Nm13))
	copy(nm12, arr.Nm12)
	copy(nm13, arr.Nm13)
	for i := 0; i < 10; i++ {
		var nMs string
		if gender == "female" {
			nMs = HalflingNameFem(arr)
			for nMs == "" {
				nMs = HalflingNameFem(arr)
			}
		} else {
			nMs = HalflingNameMas(arr, swearFilter)
			for nMs == "" {
				nMs = HalflingNameMas(arr, swearFilter)
			}
		}
		// Surname logic
		rnd := rand.Intn(len(nm12))
		rnd2 := rand.Intn(len(nm13))
		for nm12[rnd] == nm13[rnd2] {
			rnd2 = rand.Intn(len(nm13))
		}
		surname := nm12[rnd] + nm13[rnd2]
		nm12 = append(nm12[:rnd], nm12[rnd+1:]...)
		nm13 = append(nm13[:rnd2], nm13[rnd2+1:]...)
		names = append(names, nMs+" "+surname)
	}
	return names
}