package main

import (
	"fmt"
	"io"
	"os"

	"go.wit.com/log"
)

func marshal(names map[string]string) {

	if argv.DryRun {
		for k, v := range names {
			log.Info(k, "=", v)
		}
		os.Exit(0)
	}

	w, _ := os.OpenFile(names["protobase"]+".marshal.pb.go", os.O_WRONLY|os.O_CREATE, 0600)

	fmt.Fprintln(w, "package "+names["package"])
	headerComment(w)
	fmt.Fprintln(w, "import (")
	fmt.Fprintln(w, "	\"google.golang.org/protobuf/encoding/protojson\"")
	fmt.Fprintln(w, "	\"google.golang.org/protobuf/encoding/prototext\"")
	fmt.Fprintln(w, "	\"google.golang.org/protobuf/proto\"")
	fmt.Fprintln(w, ")")
	fmt.Fprintln(w, "")

	if len(argv.Marshal) == 0 {
		marshalThing(w, names["Base"])
		marshalThing(w, names["Bases"])
	} else {
		for _, v := range argv.Marshal {
			marshalThing(w, v)
		}
	}
}

func marshalThing(w io.Writer, thing string) {
	fmt.Fprintln(w, "// human readable JSON")
	fmt.Fprintln(w, "func (v *"+thing+") FormatJSON() string {")
	fmt.Fprintln(w, "	return protojson.Format(v)")
	fmt.Fprintln(w, "}")
	fmt.Fprintln(w, "")
	fmt.Fprintln(w, "// marshal json")
	fmt.Fprintln(w, "func (v *"+thing+") MarshalJSON() ([]byte, error) {")
	fmt.Fprintln(w, "	return protojson.Marshal(v)")
	fmt.Fprintln(w, "}")
	fmt.Fprintln(w, "")
	fmt.Fprintln(w, "// unmarshal json")
	fmt.Fprintln(w, "func (v *"+thing+") UnmarshalJSON(data []byte) error {")
	fmt.Fprintln(w, "	return protojson.Unmarshal(data, v)")
	fmt.Fprintln(w, "}")
	fmt.Fprintln(w, "")
	fmt.Fprintln(w, "// apparently this isn't stable, but it's awesomely better")
	fmt.Fprintln(w, "// https://protobuf.dev/reference/go/faq/#unstable-text")
	fmt.Fprintln(w, "// it's so great for config files, I'm using it by default to try to fix the problems with it")
	fmt.Fprintln(w, "func (v *"+thing+") FormatTEXT() string {")
	fmt.Fprintln(w, "	return prototext.Format(v)")
	fmt.Fprintln(w, "}")
	fmt.Fprintln(w, "")
	fmt.Fprintln(w, "// unmarshalTEXT. This reads the .text config file back in after the user edits it")
	fmt.Fprintln(w, "func (v *"+thing+") UnmarshalTEXT(data []byte) error {")
	fmt.Fprintln(w, "	return prototext.Unmarshal(data, v)")
	fmt.Fprintln(w, "}")
	fmt.Fprintln(w, "")
	fmt.Fprintln(w, "// marshal to wire. This is called winning.")
	fmt.Fprintln(w, "func (v *"+thing+") Marshal() ([]byte, error) {")
	fmt.Fprintln(w, "	return proto.Marshal(v)")
	fmt.Fprintln(w, "}")
	fmt.Fprintln(w, "")
	fmt.Fprintln(w, "// unmarshal from wire. You have won.")
	fmt.Fprintln(w, "func (v *"+thing+") Unmarshal(data []byte) error {")
	fmt.Fprintln(w, "	return proto.Unmarshal(data, v)")
	fmt.Fprintln(w, "}")
	fmt.Fprintln(w, "")
}