// 17 may 2015
package main

import (
	"fmt"
	"os"
	"flag"
	"github.com/andlabs/pgidl"
)

func geniface(iface *pgidl.Interface, prefix string) {
	v := fmt.Sprintf("type%s%s", prefix, iface.Name)
	fmt.Printf("static uintmax_t %s = 0;\n", v)
	fmt.Printf("uintmax_t %sType%s(void)\n", prefix, iface.Name)
	fmt.Printf("{\n")
	fmt.Printf("\tif (%s == 0)\n", v)
	fmt.Printf("\t\t%s = %sRegisterType(%q, ",
		v,
		prefix,
		prefix + iface.Name)
	if iface.From != "" {
		fmt.Printf("%sType%s()", prefix, iface.From)
	} else {
		fmt.Printf("0")
	}
	fmt.Printf(");\n")
	fmt.Printf("\treturn %s;\n", v)
	fmt.Printf("}\n")
}

func genpkg(p *pgidl.Package) {
	for _, o := range p.Order {
		switch o.Which {
		case pgidl.Interfaces:
			geniface(p.Interfaces[o.Index], p.Name)
		}
	}
}

func main() {
	flag.Parse()
	idl, errs := pgidl.Parse(os.Stdin, "<stdin>")
	if len(errs) != 0 {
		for _, e := range errs {
			fmt.Fprintf(os.Stderr, "%s\n", e)
		}
		os.Exit(1)
	}
	fmt.Printf("// generated by idl2h; do not edit\n")
	fmt.Printf("#include %q\n", os.Args[1])
	for _, p := range idl {
		genpkg(p)
	}
}