from dataclasses import dataclass
from pathlib import Path
from typing import List
from splat.segtypes.segment import Segment
from splat.util import options
import yaml as yaml_loader


@dataclass
class Effect:
    name: str
    args: str
    gfx: str
    empty: bool
    returns_void: bool

    def get_macro_def(self) -> str:
        ret_type = "void" if self.returns_void else "EffectInstance*"

        return f"#define EFFECT_DEF_{self.name.upper()}(func_name) {ret_type} func_name({self.args})"

    def get_macro_call(self, func_name: str) -> str:
        return f"EFFECT_DEF_{self.name.upper()}({func_name})"


def effects_from_yaml(yaml_path: Path) -> List[Effect]:
    with open(yaml_path) as f:
        effects_yaml = yaml_loader.load(f.read(), Loader=yaml_loader.SafeLoader)

    effects: List[Effect] = []
    for effect_yaml in effects_yaml:
        name = str(effect_yaml.get("name", f"{len(effects):02X}"))
        effects.append(
            Effect(
                name=name,
                args=effect_yaml.get("args", ""),
                gfx=effect_yaml.get("gfx", name),
                empty="name" not in effect_yaml,
                returns_void=effect_yaml.get("void", False),
            )
        )

    return effects


class N64SegPm_effect_loads(Segment):
    effects: List[Effect] = []

    @staticmethod
    def get_effect_asm(index, name):
        return f""".include "macro.inc"

# assembler directives
.set noat      # allow manual use of $at
.set noreorder # don't insert nops after branches
.set gp=64     # allow use of 64-bit general purpose registers

.section .text, "ax"

glabel fx_{name}
/* 00 27BDFFD0 */  addiu     $sp, $sp, -0x30
/* 04 AFA40010 */  sw        $a0, 0x10($sp)
/* 08 AFA50014 */  sw        $a1, 0x14($sp)
/* 0C AFA60018 */  sw        $a2, 0x18($sp)
/* 10 AFA7001C */  sw        $a3, 0x1c($sp)
/* 14 E7AC0020 */  swc1      $f12, 0x20($sp)
/* 18 E7AE0024 */  swc1      $f14, 0x24($sp)
/* 1C E7B00028 */  swc1      $f16, 0x28($sp)
/* 20 AFBF002C */  sw        $ra, 0x2c($sp)
/* 24 0C016959 */  jal       load_effect
/* 28 ???????? */   addiu    $a0, $zero, 0x{index:X}
/* 2C 8FA40010 */  lw        $a0, 0x10($sp)
/* 30 8FA50014 */  lw        $a1, 0x14($sp)
/* 34 8FA60018 */  lw        $a2, 0x18($sp)
/* 38 8FA7001C */  lw        $a3, 0x1c($sp)
/* 3C C7AC0020 */  lwc1      $f12, 0x20($sp)
/* 40 C7AE0024 */  lwc1      $f14, 0x24($sp)
/* 44 C7B00028 */  lwc1      $f16, 0x28($sp)
/* 48 8FBF002C */  lw        $ra, 0x2c($sp)
/* 4C 27BD0030 */  addiu     $sp, $sp, 0x30
/* 50 3C01???? */  lui       $at, %hi(gEffectTable + 0x{index * 24:X})
/* 54 8C21???? */  lw        $at, %lo(gEffectTable + 0x{index * 24:X})($at)
/* 58 00200008 */  jr        $at
/* 5C 00000000 */   nop
"""

    def __init__(
        self,
        rom_start,
        rom_end,
        type,
        name,
        vram_start,
        args,
        yaml,
    ):
        super().__init__(
            rom_start,
            rom_end,
            type,
            name,
            vram_start,
            args=args,
            yaml=yaml,
        )

        self.effects = effects_from_yaml(options.opts.src_path / "effects.yaml")

    def effect_s_path(self, effect_name: str):
        return options.opts.build_path / "asm" / "effects" / f"{effect_name}.s"

    def split(self, rom_bytes):
        for i, effect in enumerate(self.effects):
            # .s file for effect
            effect_asm = N64SegPm_effect_loads.get_effect_asm(i, effect.name)

            self.effect_s_path("").parent.mkdir(parents=True, exist_ok=True)

            with open(self.effect_s_path(effect.name), "w") as f:
                f.write(effect_asm)

    def get_linker_entries(self):
        from splat.segtypes.linker_entry import LinkerEntry

        ret = []

        for effect in self.effects:
            ret.append(
                LinkerEntry(
                    self,
                    [self.effect_s_path(effect.name)],
                    self.effect_s_path(effect.name),
                    ".text",
                    ".text",
                )
            )

        return ret

    def should_split(self) -> bool:
        return options.opts.is_mode_active(self.type)