from ChocolateBirdData.reference_implementation import get_base_structarraytypes, parse_struct_definitions_from_tsv_filename, get_structarraytype, LeftoverBits, ReadBuffer, WriteBuffer
from includes.helpers import load_tsv, deep_update

class ROMHandler:
	offset_key: str
	struct_definitions: dict

	def extract(self, table: str, in_buffer) -> list[dict]:
		# Deserialize a table
		leftover_bits = LeftoverBits()
		entry = self.addresses[table]  # Remember to try/catch
		offset = entry[self.offset_key]
		buf = ReadBuffer(in_buffer, offset)
		return get_structarraytype(entry['format'], self.struct_definitions).get_value(buf, leftover_bits)

	def build(self, table: str, new_data: list[dict], out_buffer):
		# Serialize complete data. This WILL fail if the input data is incomplete.
		leftover_bits = LeftoverBits()
		entry = self.addresses[table]  # Remember to try/catch
		offset = entry[self.offset_key]
		buf = WriteBuffer(out_buffer, offset)
		get_structarraytype(entry['format'], self.struct_definitions).put_value(buf, new_data, leftover_bits)

	def build_partial(self, table: str, new_data: list[dict], in_buffer, out_buffer):
		# Safely merge partial data over the existing data, then serialize it.
		existing_data = self.extract(table, in_buffer)
		deep_update(existing_data, new_data)
		self.build(table, existing_data, out_buffer)


def load_ff5_snes_struct_definitions() -> dict:
	existing_structs = get_base_structarraytypes()
	parse_struct_definitions_from_tsv_filename('ChocolateBirdData/structs_SNES_stubs.tsv', existing_structs)
	parse_struct_definitions_from_tsv_filename('ChocolateBirdData/5/structs/SNES_stubs.tsv', existing_structs)
	parse_struct_definitions_from_tsv_filename('ChocolateBirdData/5/structs/SNES.tsv', existing_structs)
	parse_struct_definitions_from_tsv_filename('ChocolateBirdData/5/structs/SNES_save.tsv', existing_structs)
	return existing_structs


class FF5SNESHandler(ROMHandler):
	offset_key: str = 'SNES'
	struct_definitions: dict = load_ff5_snes_struct_definitions()
	addresses: dict = {entry['Label']: entry for entry in load_tsv('ChocolateBirdData/5/addresses_SNES_PSX.tsv')}