package main

import (
	"fmt"
	"go/ast"
	"go/parser"
	"go/token"
	"io"
	"io/fs"
	"os/exec"

	//"io/fs"
	"os"
	"path/filepath"
	"strings"
	//"strings"
)

func genModStruct(fn *ast.FuncDecl, githubEditLink string, filename string) string {
	params := []string{}
	for _, fd := range fn.Type.Params.List {
		p := fmt.Sprintf(`    {Name: "%s", Type: "%+v"},`, fd.Names[0], fd.Type)
		params = append(params, p)
	}

	block := fmt.Sprintf(`{
  Name:        "%s",
  Description: "%s",
  CodeEditLink: "%s%s",
  Params: []Param{
%s
  },
},`,
		fn.Name.String(),
		strings.ReplaceAll(strings.ReplaceAll(strings.TrimSpace(fn.Doc.Text()), "\n", " "), `"`, `\"`),
		githubEditLink, filename,
		strings.Join(params, "\n"),
	)

	return block
}

func modCodeGen(dir string, githubEditLink string) (code string, err error) {
	fset := token.NewFileSet()

	files, err := os.ReadDir(dir)
	if err != nil {
		panic(err)
	}

	modStructs := []string{}
	for _, file := range files {
		if !shouldGenCodeFor(file) {
			continue
		}

		// Parse each Go file
		node, err := parser.ParseFile(fset, filepath.Join(dir, file.Name()), nil, parser.ParseComments)
		if err != nil {
			return "", err
		}

		ast.Inspect(node, func(n ast.Node) bool {
			fn, ok := n.(*ast.FuncDecl)
			if ok && fn.Recv == nil && fn.Name.IsExported() {
				modStructs = append(modStructs, genModStruct(fn, githubEditLink, file.Name()))
			}
			return true
		})

	}

	code = strings.Join(modStructs, "\n")
	return code, nil
}

func shouldGenCodeFor(file fs.DirEntry) bool {
	if file.IsDir() {
		return false
	}
	if filepath.Ext(file.Name()) != ".go" {
		return false
	}
	if strings.HasSuffix(file.Name(), "_test.go") {
		return false
	}
	return true
}

func getGitRemoteURL(remoteName string) (string, error) {
	cmd := exec.Command("git", "remote", "get-url", remoteName)
	output, err := cmd.Output()
	if err != nil {
		return "", err
	}
	url := strings.TrimSpace(string(output))

	// Convert SSH format to HTTPS format
	if strings.HasPrefix(url, "git@") {
		url = strings.Replace(url, ":", "/", 1)
		url = strings.Replace(url, "git@", "https://", 1)
		url = strings.TrimSuffix(url, ".git")
	}

	return url, nil
}

func getCurrentGitBranch() (string, error) {
	cmd := exec.Command("git", "rev-parse", "--abbrev-ref", "HEAD")
	output, err := cmd.Output()
	if err != nil {
		return "", err
	}
	return strings.TrimSpace(string(output)), nil
}

func main() {
	gitURL, err := getGitRemoteURL("origin")
	if err != nil {
		fmt.Println("Error getting Git remote URL:", err)
		return
	}

	branchName, err := getCurrentGitBranch()
	if err != nil {
		fmt.Println("Error getting current Git branch:", err)
		return
	}

	githubEditLink := fmt.Sprintf("%s/edit/%s/proxychain/requestmodifiers/", gitURL, branchName)
	rqmCode, err := modCodeGen("../../proxychain/requestmodifiers/", githubEditLink)
	if err != nil {
		panic(err)
	}

	githubEditLink = fmt.Sprintf("%s/edit/%s/proxychain/responsemodifiers/", gitURL, branchName)
	rsmCode, err := modCodeGen("../../proxychain/responsemodifiers/", githubEditLink)
	if err != nil {
		panic(err)
	}

	code := fmt.Sprintf(`
package handlers
// DO NOT EDIT THIS FILE. It is automatically generated by ladder/handlers/api_modifiers_codegen/api_modifiers_codegen.go
// The purpose of this is to produce an API reponse listing all the available modifier, their parameters and usage instructions.
// for use in proxychains.

import (
	"ladder/proxychain/responsemodifiers/api"
)

type ModifiersAPIResponse struct {
	Success bool      ||json:"success"||
	Error   api.ErrorDetails ||json:"error"||
	Result  Modifiers ||json:"result"||
}

type Modifiers struct {
	RequestModifiers  []Modifier ||json:"requestmodifiers"||
	ResponseModifiers []Modifier ||json:"responsemodifiers"||
}

type Modifier struct {
	Name        string  ||json:"name"||
	Description string  ||json:"description"||
	CodeEditLink string ||json:"code_edit_link"||
	Params      []Param ||json:"params"||
}

type Param struct {
	Name string ||json:"name"||
	Type string ||json:"type"||
}

var AllMods Modifiers = Modifiers{
	RequestModifiers: []Modifier{
%s
	},
	ResponseModifiers: []Modifier{
%s
	},
}
`, rqmCode, rsmCode)
	code = strings.ReplaceAll(code, "||", "`")

	//fmt.Println(code)

	fq, err := os.Create("../api_modifiers_structdef.gen.go")
	if err != nil {
		panic(err)
	}
	_, err = io.WriteString(fq, code)
	if err != nil {
		panic(err)
	}
}