//go:build webkit_cgo

package webkit

/*
#include <stdlib.h>
*/
import "C"

import (
	"unsafe"
)

// Resolver provides bytes and mime for a given custom URI.
type SchemeResolver func(uri string) (mime string, data []byte, ok bool)

var globalResolver SchemeResolver

// SetURISchemeResolver sets the resolver used by the custom URI scheme handler.
func SetURISchemeResolver(r SchemeResolver) { globalResolver = r }

//export goResolveURIScheme
func goResolveURIScheme(curi *C.char, outLen *C.size_t, outMime **C.char) unsafe.Pointer {
	if curi == nil || outLen == nil || outMime == nil {
		return nil
	}
	uri := C.GoString(curi)
	if globalResolver == nil {
		*outLen = 0
		*outMime = nil
		return nil
	}
	mime, data, ok := globalResolver(uri)
	if !ok || len(data) == 0 {
		*outLen = 0
		*outMime = nil
		return nil
	}
	buf := C.malloc(C.size_t(len(data)))
	if buf == nil {
		*outLen = 0
		*outMime = nil
		return nil
	}
	// Copy data into C buffer
	dst := (*[1 << 30]byte)(buf)[:len(data):len(data)]
	copy(dst, data)
	*outLen = C.size_t(len(data))
	*outMime = C.CString(mime)
	return buf
}