package main

import "core:fmt"
import "core:image/png"
import "util"
import "vendor:sdl3"

WIDTH :: 1600
HEIGHT :: 900

Game :: struct {
	render:      ^sdl3.Renderer,
	units:       [dynamic]Unit,
	player:      Unit,
	time:        u64,
	delta:       f32,
	input_state: map[sdl3.Scancode]bool,
}

main :: proc() {
	assert(sdl3.Init(sdl3.INIT_VIDEO))
	defer sdl3.Quit()

	window := sdl3.CreateWindow("Game", 1600, 900, nil)
	assert(window != nil)
	defer sdl3.DestroyWindow(window)

	render := sdl3.CreateRenderer(window, "opengl")

	assert(render != nil)

	units := make([dynamic]Unit)
	append(&units, new_unit(Faction.Allied, util.Position{500, 500}))
	append(&units, new_unit(Faction.Enemy, util.Position{700, 700}))
	input_state := make(map[sdl3.Scancode]bool)

	time := sdl3.GetTicksNS()


	game := Game {
		render      = render,
		units       = units,
		player      = new_unit(Faction.Player, util.Position{100, 100}, 200),
		time        = time,
		delta       = 0.0,
		input_state = input_state,
	}

	for {
		event: sdl3.Event
		for sdl3.PollEvent(&event) {
			#partial switch event.type {
			case .QUIT:
				return
			case .KEY_UP:
				handle_input(&game, event)
			case .KEY_DOWN:
				handle_input(&game, event)
			}
		}
		move_player(&game)
		render_game(&game)
		update_time(&game)
	}
}

update_time :: proc(game: ^Game) {
	new_time := sdl3.GetTicksNS()
	delta_ns := new_time - game.time
	game.time = new_time
	game.delta = f32(delta_ns) / f32(sdl3.NS_PER_SECOND)
}

render_game :: proc(game: ^Game) {
	sdl3.SetRenderDrawColor(game.render, 0, 0, 0, 0)
	sdl3.RenderClear(game.render)

	for unit in game.units {
		render_unit(unit, game)
	}

	render_unit(game.player, game)

	sdl3.RenderPresent(game.render)
}