// Package renderer provides Architecture rendering
package renderer

import (
	"fmt"
	"strings"

	"mermaid-go/pkg/ast"
)

// ArchitectureRenderer implements Architecture rendering
type ArchitectureRenderer struct{}

// NewArchitectureRenderer creates a new Architecture renderer
func NewArchitectureRenderer() *ArchitectureRenderer {
	return &ArchitectureRenderer{}
}

// Render renders an Architecture diagram to mermaid syntax
func (r *ArchitectureRenderer) Render(diagram *ast.ArchitectureDiagram) (string, error) {
	var result strings.Builder

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

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

	// Render groups
	for _, group := range diagram.Groups {
		result.WriteString(fmt.Sprintf("    group %s", group.ID))

		if group.Title != nil {
			result.WriteString(fmt.Sprintf("[%s]", *group.Title))
		}

		if group.In != nil {
			result.WriteString(fmt.Sprintf(" in %s", *group.In))
		}

		result.WriteString("\n")
	}

	// Render services
	for _, service := range diagram.Services {
		result.WriteString(fmt.Sprintf("    service %s", service.ID))

		if service.Title != nil {
			result.WriteString(fmt.Sprintf("[%s]", *service.Title))
		}

		if service.In != nil {
			result.WriteString(fmt.Sprintf(" in %s", *service.In))
		}

		result.WriteString("\n")
	}

	// Render edges
	for _, edge := range diagram.Edges {
		result.WriteString(fmt.Sprintf("    %s %s--%s %s",
			edge.LhsID,
			string(edge.LhsDir),
			string(edge.RhsDir),
			edge.RhsID))

		if edge.Title != nil {
			result.WriteString(fmt.Sprintf(" : %s", *edge.Title))
		}

		result.WriteString("\n")
	}

	return result.String(), nil
}