// Package renderer provides Timeline rendering
package renderer

import (
	"fmt"
	"strings"

	"mermaid-go/pkg/ast"
)

// TimelineRenderer implements Timeline rendering
type TimelineRenderer struct{}

// NewTimelineRenderer creates a new Timeline renderer
func NewTimelineRenderer() *TimelineRenderer {
	return &TimelineRenderer{}
}

// Render renders a Timeline to mermaid syntax
func (r *TimelineRenderer) Render(diagram *ast.TimelineDiagram) (string, error) {
	var result strings.Builder

	// Start with timeline declaration
	result.WriteString("timeline\n")

	// Add title if present
	if diagram.Title != nil {
		result.WriteString(fmt.Sprintf("    title %s\n", *diagram.Title))
	}

	// Render sections and events
	for _, section := range diagram.Sections {
		// Add section if it has a meaningful name
		if section.Name != "" && section.Name != "Timeline" {
			result.WriteString(fmt.Sprintf("    section %s\n", section.Name))
		}

		// Render events
		for _, event := range section.Events {
			result.WriteString(fmt.Sprintf("    : %s\n", event.Name))
		}
	}

	return result.String(), nil
}