first commit

backend/internal/calendar/provider.go

@@ -0,0 +1,136 @@
+package calendar
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"strings"
+	"time"
+)
+
+type Holiday struct {
+	Date string `json:"date"`
+	Name string `json:"name"`
+	Type string `json:"type"`
+}
+
+type Provider interface {
+	NationalHolidays(ctx context.Context, year int) ([]Holiday, error)
+}
+
+type CommemorativeProvider interface {
+	CommemorativeDates(ctx context.Context, year int) ([]ExternalCommemorativeDate, error)
+}
+
+type ExternalCommemorativeDate struct {
+	Date        string
+	Name        string
+	Description string
+	SourceID    string
+}
+
+type BrasilAPIProvider struct {
+	baseURL string
+	client  *http.Client
+}
+
+type FeriadosBrasilProvider struct {
+	baseURL string
+	client  *http.Client
+}
+
+func NewFeriadosBrasilProvider() FeriadosBrasilProvider {
+	return FeriadosBrasilProvider{
+		baseURL: "https://raw.githubusercontent.com/joaopbini/feriados-brasil/master/dados/comemorativas/json",
+		client: &http.Client{
+			Timeout: 10 * time.Second,
+		},
+	}
+}
+
+type feriadosBrasilCommemorativeDate struct {
+	ID         string `json:"id"`
+	Data       string `json:"data"`
+	Nome       string `json:"nome"`
+	Tipo       string `json:"tipo"`
+	Descricao  string `json:"descricao"`
+	UF         string `json:"uf"`
+	CodigoIBGE *int   `json:"codigo_ibge"`
+}
+
+func (p FeriadosBrasilProvider) CommemorativeDates(ctx context.Context, year int) ([]ExternalCommemorativeDate, error) {
+	url := fmt.Sprintf("%s/%d.json", p.baseURL, year)
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	resp, err := p.client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("feriados-brasil returned status %d", resp.StatusCode)
+	}
+
+	var records []feriadosBrasilCommemorativeDate
+	if err := json.NewDecoder(resp.Body).Decode(&records); err != nil {
+		return nil, err
+	}
+
+	dates := make([]ExternalCommemorativeDate, 0, len(records))
+	for _, record := range records {
+		if strings.ToUpper(strings.TrimSpace(record.Tipo)) != "COMEMORATIVA" {
+			continue
+		}
+		parsed, err := time.Parse("02/01/2006", strings.TrimSpace(record.Data))
+		if err != nil {
+			continue
+		}
+		dates = append(dates, ExternalCommemorativeDate{
+			Date:        parsed.Format("2006-01-02"),
+			Name:        strings.TrimSpace(record.Nome),
+			Description: strings.TrimSpace(record.Descricao),
+			SourceID:    strings.TrimSpace(record.ID),
+		})
+	}
+
+	return dates, nil
+}
+
+func NewBrasilAPIProvider(baseURL string) BrasilAPIProvider {
+	return BrasilAPIProvider{
+		baseURL: baseURL,
+		client: &http.Client{
+			Timeout: 10 * time.Second,
+		},
+	}
+}
+
+func (p BrasilAPIProvider) NationalHolidays(ctx context.Context, year int) ([]Holiday, error) {
+	url := fmt.Sprintf("%s/api/feriados/v1/%d", p.baseURL, year)
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	resp, err := p.client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("brasilapi returned status %d", resp.StatusCode)
+	}
+
+	var holidays []Holiday
+	if err := json.NewDecoder(resp.Body).Decode(&holidays); err != nil {
+		return nil, err
+	}
+
+	return holidays, nil
+}