package sqlgen

import (
	"bytes"
	_ "embed"
	"fmt"
	"go/format"
	"os"
	"path/filepath"
	"text/template"
)

//go:embed gen.go.tmpl
var fileTemplate string

func render(driver, schemaPath, outputPath string) (err error) {
	outputPath, err = filepath.Abs(outputPath)
	if err != nil {
		return err
	}
	sch, err := parsePath(driver, schemaPath)
	if err != nil {
		return err
	}

	tmpl := template.Must(template.New("").Parse(fileTemplate))

	buf := &bytes.Buffer{}
	err = tmpl.Execute(buf, struct {
		PackageName string
		Schema      *schema
	}{filepath.Base(filepath.Dir(outputPath)), sch})
	if err != nil {
		return err
	}

	formatted, err := format.Source(buf.Bytes())
	if err != nil {
		return fmt.Errorf("formatting generated code: %w", err)
	}

	return os.WriteFile(outputPath, formatted, 0o644)
}