// Copyright 2017-2025 WIT.COM Inc. All rights reserved.
// Use of this source code is governed by the GPL 3.0

package main

import (
	"fmt"
	"os"
	"path/filepath"
	"strings"

	"go.wit.com/log"
)

func doWITCOM() {
	pwd, err := os.Getwd()
	if err != nil {
		return
	}
	files, err := scanForGoFiles(pwd)
	if err != nil {
		return
	}

	for _, file := range files {
		addCommonHeader(file)
	}
}

// add a common header for WIT files
// add a common header for WIT files

func addCommonHeader(filename string) error {
	// read in the .proto file
	data, err := os.ReadFile(filename)
	if err != nil {
		log.Info("file read failed", filename, err)
		return err
	}

	var newfile string
	var start bool = true
	var found bool
	var done bool

	// drop the old copywrite lines
	for _, line := range strings.Split(string(data), "\n") {
		// first line must have WIT.COM
		if strings.HasPrefix(line, "//") && start {
			start = false
			if strings.Contains(line, "WIT.COM") {
				found = true
			} else {
				newfile += fmt.Sprintln(line)
			}
			continue
		}

		// dump every other comment
		if strings.HasPrefix(line, "//") && found {
			continue
		} else {
			found = false
		}

		// print the header once
		if !done {
			newfile += fmt.Sprintln("// Copyright 2017-2025 WIT.COM Inc. All rights reserved.")
			newfile += fmt.Sprintln("// Use of this source code is governed by the GPL 3.0")
			newfile += fmt.Sprintln("")
			done = true
		}
		newfile += fmt.Sprintln(line)
	}

	pf, err := os.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
	if err != nil {
		log.Info("file open error. permissions?", filename, err)
		return err
	}

	// trim trailing empty lines from the new file
	newfile = strings.TrimSpace(newfile)
	fmt.Fprintln(pf, newfile)
	pf.Close()

	return nil
}

// look for any .go files. do not enter directories
func scanForGoFiles(startDir string) ([]string, error) {
	var files []string
	err := filepath.Walk(startDir, func(path string, info os.FileInfo, err error) error {
		if err != nil {
			return err
		}

		// ignore the start dir
		if startDir == path {
			return nil
		}

		if strings.HasSuffix(path, ".go") {
			files = append(files, path)
		}
		if strings.HasSuffix(path, ".proto") {
			files = append(files, path)
		}

		// don't go into any directories
		if info.IsDir() {
			return filepath.SkipDir
		}
		return nil
	})

	return files, err
}