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package factgiver
import (
"fmt"
"math/rand"
"regexp"
"strings"
"time"
"github.com/SayaAndy/saya-today-web/config"
"github.com/SayaAndy/saya-today-web/internal/b2"
)
type FactGiver struct {
b2Client *b2.B2Client
cache map[string][]string
langs []string
factsFileName string
nlRe *regexp.Regexp
randGen *rand.Rand
}
func NewFactGiver(cfg *config.FactGiverConfig, langs []string) (*FactGiver, error) {
b2Client, err := b2.NewB2Client(&cfg.Storage.Config)
if err != nil {
return nil, fmt.Errorf("fail to init b2 client for a new fact giver: %s", err.Error())
}
factGiver := &FactGiver{
b2Client: b2Client,
cache: make(map[string][]string, len(langs)),
langs: langs,
factsFileName: cfg.FactsFileName,
nlRe: regexp.MustCompile(`\r?\n`),
randGen: rand.New(rand.NewSource(time.Now().UnixNano())),
}
if err = factGiver.initCache(); err != nil {
return nil, fmt.Errorf("fail to init cache for a new fact giver: %s", err.Error())
}
return factGiver, nil
}
func (g *FactGiver) Give(lang string) [3]string {
factSlice := make([]string, len(g.cache[lang]))
copy(factSlice, g.cache[lang])
g.randGen.Shuffle(len(factSlice), func(i, j int) {
factSlice[i], factSlice[j] = factSlice[j], factSlice[i]
})
return [3]string{factSlice[0], factSlice[1], factSlice[2]}
}
func (g *FactGiver) initCache() error {
for _, lang := range g.langs {
localFacts := strings.Replace(g.factsFileName, "*", lang, 1)
factsContentBytes, err := g.b2Client.ReadAll(localFacts)
if err != nil {
return fmt.Errorf("fail to read '%s' facts file: %s", lang, err.Error())
}
factsContent := string(factsContentBytes)
g.cache[lang] = g.nlRe.Split(factsContent, -1)
if g.cache[lang][len(g.cache[lang])-1] == "" {
g.cache[lang] = g.cache[lang][:len(g.cache[lang])-1]
}
}
return nil
}
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