// Package renderer provides User Journey rendering
package renderer

import (
	"fmt"
	"strings"

	"mermaid-go/pkg/ast"
)

// JourneyRenderer implements User Journey rendering
type JourneyRenderer struct{}

// NewJourneyRenderer creates a new Journey renderer
func NewJourneyRenderer() *JourneyRenderer {
	return &JourneyRenderer{}
}

// Render renders a User Journey to mermaid syntax
func (r *JourneyRenderer) Render(diagram *ast.UserJourneyDiagram) (string, error) {
	var result strings.Builder

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

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

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

		// Render tasks
		for _, task := range section.Tasks {
			result.WriteString(fmt.Sprintf("    %s : ", task.Name))

			// Add score if present
			if task.Score != nil {
				result.WriteString(fmt.Sprintf("%.0f", *task.Score))
			}

			// Add people if present
			if len(task.People) > 0 {
				result.WriteString(" : ")
				result.WriteString(strings.Join(task.People, ", "))
			}

			result.WriteString("\n")
		}
	}

	return result.String(), nil
}