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//go:build generate

package main

import (
	"bytes"
	_ "embed"
	"fmt"
	"go/format"
	"os"
	"os/exec"
)

var tailwindCSS = `
@tailwind base;
@tailwind components;
@tailwind utilities;
`

//go:generate templ generate
//go:generate go run generate.go
func main() {
	if err := tailwind(); err != nil {
		panic(err)
	}
}

// Generate tailwind code from templ templates and combine with other misc CSS
func tailwind() error {
	fmt.Println("generating tailwind...")

	tmp, err := os.CreateTemp(os.TempDir(), "cfg-tailwind*")
	if err != nil {
		return err
	}
	defer os.Remove(tmp.Name())
	if _, err := tmp.WriteString(tailwindCSS); err != nil {
		return err
	}
	tmp.Close()

	styles, err := os.Create("tailwind.go")
	if err != nil {
		return err
	}
	defer styles.Close()

	var buf bytes.Buffer
	cmd := exec.Command("tailwind-ctp", "-i", tmp.Name(), "--minify")
	cmd.Stdout = &buf
	if err := cmd.Run(); err != nil {
		return err
	}

	code := fmt.Sprintf(`// Code generated by generate.go - DO NOT EDIT.
package static

		import "net/http"
		
		func TailwindHandler(w http.ResponseWriter, r *http.Request) {
			w.Header().Set("Content-Type", "text/css")
			w.Write([]byte(%q))
		}`, buf.String())
	formatted, err := format.Source([]byte(code))
	if err != nil {
		return err
	}
	styles.Write(formatted)

	fmt.Println("finished generating tailwind")
	return nil
}