package main

import (
	"errors"
	"flag"
	"fmt"
	"go/format"
	"io/ioutil"
	"os"

	"github.com/z7zmey/php-parser/parser"
	"github.com/z7zmey/php-parser/visitor"

	"php2go/parseutil"
)

const (
	phpVersionMajor = 7
	phpVersionMinor = 4
	phpVersionPatch = 0
	phpVersionExtra = `-php2go`
)

func ConvertFile(filename string) (string, error) {

	inputFile, err := ioutil.ReadFile(filename)
	if err != nil {
		return "", err
	}

	namespaces := visitor.NewNamespaceResolver()
	// scope := NewScope()
	state := conversionState{
		importPackages: make(map[string]struct{}),
	}

	p, err := parser.NewParser([]byte(inputFile), fmt.Sprintf("%d.%d", phpVersionMajor, phpVersionMinor))
	if err != nil {
		panic(err)
	}

	// Enable comments extraction
	p.WithFreeFloating()

	// Parse PHP content
	p.Parse()
	for _, err := range p.GetErrors() {
		return "", errors.New(err.String())
	}
	n := p.GetRootNode()

	// Debug pass: Walk and print JSON...
	if fh, err := os.OpenFile(filename+`.parse.json`, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644); err == nil {
		v := visitor.NewPrettyJsonDumper(fh, namespaces)
		n.Walk(v)
		fh.Close()
	}

	// Pass 1: Normalise Alt** Stmt types
	normaliser := parseutil.MutatingWalker{
		EnterNode: normaliseAltCb,
		LeaveNode: parseutil.MutatingWalkerNoop,
	}
	err = normaliser.Walk(&n)
	if err != nil {
		return "", err
	}

	// Pass 1.5: Hoist some expressions out of rvalue contexts
	err = runHoistPass(&n)
	if err != nil {
		return "", err
	}

	// Debug pass: Walk and print JSON...
	if fh, err := os.OpenFile(filename+`.parse2.json`, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644); err == nil {
		v := visitor.NewPrettyJsonDumper(fh, namespaces)
		n.Walk(v)
		fh.Close()
	}

	// Pass 2: Walk and print (converted)
	ret, err := state.convert(n)
	if err != nil {
		return "", err
	}

	// Pass 3: Gofmt output
	// TODO pass flags to get -s/-r equivalent for more agressive simplification
	formatted, err := format.Source([]byte(ret))
	if err != nil {
		ret += "// Gofmt failed: " + err.Error()
		return ret, nil
	}

	// Done
	return string(formatted), nil
}

func main() {

	filename := flag.String("InFile", "", "Select file to convert")
	flag.Parse()

	ret, err := ConvertFile(*filename)
	if err != nil {
		fmt.Fprintln(os.Stderr, err)
		os.Exit(1)
	}

	fmt.Println(ret)
}