feat: initial release v0.3.0

- Support 9 chart types: line, bar, pie, scatter, bubble, donut, mixed, polar, radar
- Multi-format output: ANSI, SVG, PNG, Markdown
- Go + Fiber + gonum/plot
- Docker support
- Morandi color palette

internal/service/chart.go

@@ -0,0 +1,85 @@
+package service
+
+import (
+	"fmt"
+
+	"github.com/google/uuid"
+	"github.com/picoclaw/chart/internal/renderer"
+	"github.com/picoclaw/chart/internal/types"
+)
+
+type ChartService struct {
+	svgRenderer  *renderer.SVGRenderer
+	pngRenderer  *renderer.PNGRenderer
+	ansiRenderer *renderer.ANSIRenderer
+	textRenderer *renderer.TextRenderer
+	chartCache   map[string]*types.Chart
+}
+
+func NewChartService() *ChartService {
+	return &ChartService{
+		svgRenderer:  renderer.NewSVGRenderer(),
+		pngRenderer:  renderer.NewPNGRenderer(),
+		ansiRenderer: renderer.NewANSIRenderer(),
+		textRenderer: renderer.NewTextRenderer(),
+		chartCache:   make(map[string]*types.Chart),
+	}
+}
+
+func (s *ChartService) CreateChart(req *types.ChartRequest) (*types.ChartResponse, error) {
+	chart := &types.Chart{
+		ID:    uuid.New().String(),
+		Type:  req.Type,
+		Title: req.Title,
+		Data:  req.Data,
+	}
+
+	svgData, err := s.svgRenderer.Render(chart)
+	if err != nil {
+		return nil, fmt.Errorf("failed to render SVG: %w", err)
+	}
+	chart.SVG = svgData
+
+	pngData, err := s.pngRenderer.Render(chart)
+	if err != nil {
+		return nil, fmt.Errorf("failed to render PNG: %w", err)
+	}
+	chart.PNG = pngData
+
+	ansiData, err := s.ansiRenderer.Render(chart)
+	if err != nil {
+		return nil, fmt.Errorf("failed to render ANSI: %w", err)
+	}
+
+	textData, err := s.textRenderer.Render(chart)
+	if err != nil {
+		return nil, fmt.Errorf("failed to render text: %w", err)
+	}
+
+	s.chartCache[chart.ID] = chart
+
+	return &types.ChartResponse{
+		ChartID:  chart.ID,
+		Text:     string(textData),
+		ANSI:     string(ansiData),
+		SVG:      string(chart.SVG),
+		PNGURL:   fmt.Sprintf("/api/v1/chart/%s.png", chart.ID),
+		Markdown: fmt.Sprintf("![%s](/api/v1/chart/%s.png)", chart.Title, chart.ID),
+	}, nil
+}
+
+func (s *ChartService) GetChart(id string) (*types.Chart, error) {
+	chart, ok := s.chartCache[id]
+	if !ok {
+		return nil, fmt.Errorf("chart not found: %s", id)
+	}
+	return chart, nil
+}
+
+func (s *ChartService) GetChartPNG(id string) ([]byte, error) {
+	chart, err := s.GetChart(id)
+	if err != nil {
+		return nil, err
+	}
+	return chart.PNG, nil
+}