"""All states the are used in-game"""

from __future__ import annotations
from random import Random

import attrs
import tcod.console
import tcod.constants
import tcod.ecs
import tcod.event
from tcod.event import KeySym
from tcod.map import Map

import g
from game.components import Action, Gold, Graphic, Position
from game.constants import DIRECTION_KEYS, ACTION_KEYS, FLOOR_CHAR
from game.screens import Push, Screen, ScreenResult
from game.tags import IsDoor, IsItem, IsPlayer, IsActor
from game.constants import WALL_CHAR, VERTICAL_WALL_CHAR
from game.screens import menu_screens
from game.world_tools import world_pos_to_map_pos, map_pos_to_world_pos

def _recalc_fov(pos):
    cam_map = world_pos_to_map_pos(pos)
    g.world[None].components[Map].compute_fov(cam_map.x, cam_map.y, 100)

def _handle_movement(player, map, dir):
    pos = player.components[Position]
    new_pos = pos + dir
    map_pos = world_pos_to_map_pos(new_pos)
    if a := g.world.Q.all_of(components=[Action], tags=[new_pos]):
        for aa in a:
            aa.components[Action](aa)
        map_pos = world_pos_to_map_pos(pos)
        map.compute_fov(map_pos.x, map_pos.y, 100)
        return None
    if not map.walkable[map_pos.y, map_pos.x]:
        return None
    player.components[Position] = new_pos
    _recalc_fov(new_pos)

            # Auto pickup gold
    for gold in g.world.Q.all_of(components=[Gold], tags=[player.components[Position], IsItem]):
        player.components[Gold] += gold.components[Gold]
        text = f"Picked up {gold.components[Gold]}g, total: {player.components[Gold]}g"
        g.world[None].components[("Text", str)] = text
        gold.clear()

def _handle_action(player):
    for entity in g.world.Q.all_of(components=[Action, Position]):
        player_pos = player.components[Position]
        if (player_pos - entity.components[Position]).length() < 2:
            entity.components[Action](entity)
            _recalc_fov(player_pos)

def _draw_entity(entity: tcod.ecs.Entity, camera_pos, camera_radius_x, camera_radius_y):
    pos = entity.components[Position]
    screen_pos = pos - camera_pos
    if not (-camera_radius_x <= screen_pos.x < camera_radius_x\
            and -camera_radius_y <= screen_pos.y < camera_radius_y):
        return
    map_pos = world_pos_to_map_pos(pos)
    if g.world[None].components[Map].fov[map_pos.y, map_pos.x]:
        graphic = entity.components[Graphic]
        g.console.rgb[["ch", "fg"]][screen_pos.y + camera_radius_y, screen_pos.x + camera_radius_x] = graphic.ch, graphic.fg


@attrs.define()
class MainScreen(Screen):
    """Primary in-game state."""

    def on_event(self, event: tcod.event.Event) -> ScreenResult:
        """Handle events for the in-game state."""
        (player,) = g.world.Q.all_of(tags=[IsPlayer])
        map: Map = g.world[None].components[Map]
        match event:
            case tcod.event.KeyDown(sym=sym) if sym in ACTION_KEYS:
                _handle_action(player)
            case tcod.event.Quit():
                raise SystemExit()
            case tcod.event.KeyDown(sym=sym) if sym in DIRECTION_KEYS:
                dir = DIRECTION_KEYS[sym]
                return _handle_movement(player, map, dir)
            case tcod.event.KeyDown(sym=KeySym.ESCAPE):
                return Push(menu_screens.MainMenu())
            case _:
                return None

    def on_draw(self, console: tcod.console.Console) -> None:
        """Draw the standard screen."""
        centers = [a.components[Position] for a in g.world.Q.all_of(tags=[IsPlayer])]
        camera_pos = sum(centers, start=Position(0,0))
        camera_pos = camera_pos.mod(len(centers))
        h = console.height//2
        w = console.width//2

        map: Map = g.world[None].components[Map]

        # Draw walls and floors
        doors = [ d.components[Position] for d in g.world.Q.all_of(tags=[IsDoor]) ]
        for i in range(console.width):
            for j in range(console.height):
                world_pos = Position(i-w,j-h)+camera_pos
                map_pos = world_pos_to_map_pos(world_pos)
                in_map = 0 <= map_pos.x < map.width and 0 <= map_pos.y < map.height
                in_fov = in_map and map.fov[map_pos.y,map_pos.x]
                if not in_fov:
                    console.rgb[["ch","fg"]][j, i] = 0x2591, (50,50,50)
                    continue
                walkable = (not in_map) or map.walkable[map_pos.y, map_pos.x]
                if walkable:
                    console.rgb[["ch","fg"]][j, i] = FLOOR_CHAR, (70,70,70)
                    continue
                ch = VERTICAL_WALL_CHAR
                if map.walkable[map_pos.y+1, map_pos.x] and world_pos+Position(0,1) not in doors:
                    ch = WALL_CHAR
                console.rgb[["ch","fg"]][j, i] = ch, (255,255,255)

        # draw all entities that are not actors
        for entity in g.world.Q.all_of(components=[Position, Graphic]).none_of(tags=[IsActor]):
            _draw_entity(entity, camera_pos, w, h)
        # draw all actors
        for actor in g.world.Q.all_of(components=[Position, Graphic], tags=[IsActor]).none_of(tags=[IsPlayer]):
            _draw_entity(actor, camera_pos, w, h)
        # draw the player
        for player in g.world.Q.all_of(tags=[IsPlayer]):
            _draw_entity(player, camera_pos, w, h)
        if text := g.world[None].components.get(("Text", str)):
            console.print(x=0, y=console.height - 1, string=text, fg=(255, 255, 255), bg=(0, 0, 0))