odd leaky toilet repair

OK I live in Thailand. The house my spouse owns certainly has some questionable craftsmanship. Have a leaky toilet in one of the bathrooms. When I looked at the toilet I noticed that the toilet is not attached with bolts. I looked all I could on line and decided to try and at least see if I can fix it and I remove the toilet and I discover there is no toilet flange or seal of any kind on it. Not sure what material they used (grout, plaster, caulking?) to secure it? The question is what do I do with this? I assume I must chisel off the material, but what about installing a flange? What are my options? The pipe where the flange should be is in the front of the toilet hence they made that slide.

 

Welcome to the forums! Questionable is an understatement. I am gathering by the way it was installed that the waste hit on the grouted part and ran downhill slightly to an open pipe, and the gobs of caulk were to keep the waste and smell at bay.

Is this on a concrete slab or is there framing below that is accessible. The waste pipe must be moved to within 12 1/2" or so centered off the finished back wall. It must have a flange and the toilet will be attached to it. No silicone around the base.