Pokemon Emerald: Convert to procedure patch (#2995)

* Pokemon Emerald: Convert to procedure patch

* Pokemon Emerald: Remove assertion for vanilla rom's existence

* Pokemon Emerald: Add APPP implication to changelog

* Pokemon Emerald: Move procedure patch changelog line to new version

* Pokemon Emerald: Modify changelog versions

* Pokemon Emerald: Fix patch file download not appearing

---------

Co-authored-by: NewSoupVi <57900059+NewSoupVi@users.noreply.github.com>

worlds/pokemon_emerald/__init__.py

@@ -5,6 +5,7 @@ from collections import Counter
 import copy
 import logging
 import os
+import pkgutil
 from typing import Any, Set, List, Dict, Optional, Tuple, ClassVar, TextIO, Union
 
 from BaseClasses import ItemClassification, MultiWorld, Tutorial, LocationProgressType
@@ -25,7 +26,7 @@ from .options import (Goal, DarkCavesRequireFlash, HmRequirements, ItemPoolType,
 from .pokemon import (get_random_move, get_species_id_by_label, randomize_abilities, randomize_learnsets,
                       randomize_legendary_encounters, randomize_misc_pokemon, randomize_starters,
                       randomize_tm_hm_compatibility,randomize_types, randomize_wild_encounters)
-from .rom import PokemonEmeraldDeltaPatch, create_patch 
+from .rom import PokemonEmeraldProcedurePatch, write_tokens 
 
 
 class PokemonEmeraldWebWorld(WebWorld):
@@ -60,7 +61,7 @@ class PokemonEmeraldSettings(settings.Group):
         """File name of your English Pokemon Emerald ROM"""
         description = "Pokemon Emerald ROM File"
         copy_to = "Pokemon - Emerald Version (USA, Europe).gba"
-        md5s = [PokemonEmeraldDeltaPatch.hash]
+        md5s = [PokemonEmeraldProcedurePatch.hash]
 
     rom_file: PokemonEmeraldRomFile = PokemonEmeraldRomFile(PokemonEmeraldRomFile.copy_to)
 
@@ -126,9 +127,6 @@ class PokemonEmeraldWorld(World):
     def stage_assert_generate(cls, multiworld: MultiWorld) -> None:
         from .sanity_check import validate_regions
 
-        if not os.path.exists(cls.settings.rom_file):
-            raise FileNotFoundError(cls.settings.rom_file)
-
         assert validate_regions()
 
     def get_filler_item_name(self) -> str:
@@ -591,7 +589,9 @@ class PokemonEmeraldWorld(World):
         randomize_opponent_parties(self)
         randomize_starters(self)
 
-        create_patch(self, output_directory)
+        patch = PokemonEmeraldProcedurePatch(player=self.player, player_name=self.multiworld.player_name[self.player])
+        patch.write_file("base_patch.bsdiff4", pkgutil.get_data(__name__, "data/base_patch.bsdiff4"))
+        write_tokens(self, patch)
 
         del self.modified_trainers
         del self.modified_tmhm_moves
@@ -600,6 +600,10 @@ class PokemonEmeraldWorld(World):
         del self.modified_starters
         del self.modified_species
 
+        # Write Output
+        out_file_name = self.multiworld.get_out_file_name_base(self.player)
+        patch.write(os.path.join(output_directory, f"{out_file_name}{patch.patch_file_ending}"))
+
     def write_spoiler(self, spoiler_handle: TextIO):
         if self.options.dexsanity:
             from collections import defaultdict