//go:build mage

package main

import (
	"fmt"
	"os"
	"path/filepath"
	"strings"
	"text/template"
)

func render(cfg config, component string) error {
	buildDirName := filepath.Join(rootBuildDir, component)
	if err := os.MkdirAll(buildDirName, 0o750); err != nil {
		return fmt.Errorf("unable to make %s; %w", buildDirName, err)
	}

	templateDirName := filepath.Join(rootTemplatesDir, component)

	files, err := os.ReadDir(templateDirName)
	if err != nil {
		return fmt.Errorf("unable to read files from %s; %w ", templateDirName, err)
	}

	for _, f := range files {
		err := func() error {
			templateFilename := f.Name()

			if f.IsDir() || !strings.HasSuffix(templateFilename, templateExtension) {
				return nil
			}

			outputFilename := strings.TrimSuffix(templateFilename, templateExtension)
			outputPath := filepath.Join(buildDirName, outputFilename)

			file, err := os.Create(outputPath)
			if err != nil {
				return fmt.Errorf("unable to create the file '%s'; %w", outputPath, err)
			}
			defer file.Close()

			templatePath := filepath.Join(templateDirName, templateFilename)
			tmpl, err := template.New(templateFilename).ParseFiles(templatePath)
			if err != nil {
				return fmt.Errorf("unable to create a new template value from '%s'; %w", templateFilename, err)
			}

			if err = tmpl.Execute(file, cfg); err != nil {
				return fmt.Errorf("unable to render the template to '%s'; %w", outputPath, err)
			}

			return nil
		}()
		if err != nil {
			return fmt.Errorf("an error occurred whilst rendering the templates for '%s'; %w", component, err)
		}
	}

	return nil
}