package draw

import "core:log"

import rl "vendor:raylib"

Sprite :: struct {
  image: rl.Texture2D,
  anim: Animation,
  active_anim: u32,
  frame_time: f32,
  current_frame: i32,

  width: i32,
  height: i32,
  
  pos: Vec2,
  offset: Vec2,
  rotation: f32,
  scale: Vec2,
}

init_sprite :: proc(
  sprite: ^Sprite, 
  path: string,
  anim: Animation = {},
) -> bool {
  byte_path := make([]u8, len(path) + 1, context.temp_allocator)
  copy(byte_path, path)
  byte_path[len(path)] = 0

  sprite.image = rl.LoadTexture(transmute(cstring)&byte_path[0])
  sprite.anim = anim

  sprite.width = i32(int(sprite.image.width) / len(sprite.anim.frames))
  sprite.height = i32(sprite.image.height)

  sprite.scale = Vec2{1, 1}

  log.debugf(
    "loaded sprite '%v' %vx%v (%vx%v)",
    path,
    sprite.width, sprite.height,
    sprite.image.width, sprite.image.height,
  )

  return true
}

destroy_sprite :: proc(sprite: Sprite) {
  rl.UnloadTexture(sprite.image)
}

set_sprite_active_tag :: proc(sprite: ^Sprite, tag_name: string) {
  sprite.active_anim = sprite.anim.frame_tags_indices[tag_name]
}

update_sprite :: proc(sprite: ^Sprite, dt: f32) {
  sprite.frame_time += dt

  tag := sprite.anim.frame_tags[sprite.active_anim]
  frame := sprite.anim.frames[sprite.current_frame]
  duration := f32(frame.duration) / 1000

  if sprite.frame_time > duration {
    sprite.frame_time -= duration
    sprite.current_frame += 1
  }

  if sprite.current_frame < tag.from {
    sprite.current_frame = tag.to
  }
  if sprite.current_frame > tag.to {
    sprite.current_frame = tag.from
  }
}

sprite :: proc(
  sprite: Sprite,
) {
  frame := sprite.anim.frames[sprite.current_frame]
  
  texture_quad(
    sprite.image,
    Rect {
      Vec2{f32(frame.rect.x), f32(frame.rect.y)},
      Vec2{f32(frame.rect.w), f32(frame.rect.h)},
    },
    sprite.pos,
    sprite.offset,
    sprite.rotation,
    sprite.scale,
  )
}