<?php

declare(strict_types=1);

namespace Tests\Unit\Game;

use App\Game\Entities\Zombie;
use App\Game\InputState;
use App\Game\Player;
use App\Game\Room;
use PHPUnit\Framework\Attributes\Test;
use PHPUnit\Framework\TestCase;

final class PlayerTest extends TestCase
{
    private function makePlayer(?Room $room = null): Player
    {
        $room = $room ?? new Room('test');
        $input = new InputState;

        return new Player('p1', 'Tester', $input, $room->entities, $room, [
            'x' => 100.0,
            'y' => 100.0,
            'health' => 3,
        ]);
    }

    #[Test]
    public function movement_keys_affect_velocity(): void
    {
        $room = new Room('test');
        $input = new InputState(['d']);
        $player = new Player('p1', 'Tester', $input, $room->entities, $room, ['x' => 100.0, 'y' => 100.0]);
        $player->update(1.0 / 60.0);
        $this->assertGreaterThan(100.0, $player->pos->x);
    }

    #[Test]
    public function fire_spawns_bullets(): void
    {
        $room = new Room('test');
        $input = new InputState(fire: true);
        $player = new Player('p1', 'Tester', $input, $room->entities, $room, ['x' => 100.0, 'y' => 100.0]);
        $room->addPlayer($player);
        $player->update(1.0 / 60.0);
        $bullets = $room->entities->findByKind('bullet');
        $this->assertNotEmpty($bullets);
    }

    #[Test]
    public function auto_aim_fires_at_nearest_zombie_without_mouse(): void
    {
        $room = new Room('test');
        $room->state = Room::STATE_PLAYING;
        $input = new InputState(fire: false);
        $player = new Player('p1', 'Tester', $input, $room->entities, $room, ['x' => 100.0, 'y' => 100.0]);
        $room->addPlayer($player);
        $zombie = new Zombie(300.0, 100.0, $room->entities, $room, ['emergeTime' => 0.0]);
        $zombie->target = $player;
        $room->entities->append($zombie);
        $player->update(1.0 / 60.0);
        $bullets = $room->entities->findByKind('bullet');
        $this->assertNotEmpty($bullets, 'auto-aim should fire at a zombie without the mouse held');
        $direction = $bullets[0]->velocity->normalize();
        $this->assertGreaterThan(0.9, $direction->x, 'bullet should fly toward the zombie to the right');
    }

    #[Test]
    public function auto_aim_does_not_fire_without_target(): void
    {
        $room = new Room('test');
        $input = new InputState(fire: false);
        $player = new Player('p1', 'Tester', $input, $room->entities, $room, ['x' => 100.0, 'y' => 100.0]);
        $room->addPlayer($player);
        $player->update(1.0 / 60.0);
        $this->assertEmpty($room->entities->findByKind('bullet'), 'no auto-fire when no zombie is in range');
    }

    #[Test]
    public function take_damage_decreases_health_and_cooldown_prevents_double_hit(): void
    {
        $room = new Room('test');
        $player = $this->makePlayer($room);
        $player->takeDamage();
        $this->assertSame(2, $player->health);
        $this->assertFalse($player->dead);
        $player->takeDamage();
        $this->assertSame(2, $player->health, 'damage cooldown prevented second hit');
    }

    #[Test]
    public function take_damage_kills_at_zero_health(): void
    {
        $room = new Room('test');
        $player = $this->makePlayer($room);
        $player->takeDamage();
        $player->update(0.6);
        $player->takeDamage();
        $player->update(0.6);
        $player->takeDamage();
        $this->assertSame(0, $player->health);
        $this->assertTrue($player->dead);
    }

    #[Test]
    public function apply_upgrade_increases_level_and_effects(): void
    {
        $room = new Room('test');
        $player = $this->makePlayer($room);
        $originalFireRate = $player->fireRate;
        $this->assertTrue($player->applyUpgrade('rapid'));
        $this->assertSame(1, $player->upgrades['rapid']);
        $this->assertLessThan($originalFireRate, $player->fireRate);
    }

    #[Test]
    public function apply_upgrade_returns_false_when_maxed(): void
    {
        $room = new Room('test');
        $player = $this->makePlayer($room);
        for ($i = 0; $i < $player->maxUpgradeLevel; $i++) {
            $this->assertTrue($player->applyUpgrade('damage'));
        }
        $this->assertFalse($player->applyUpgrade('damage'));
        $this->assertSame($player->maxUpgradeLevel, $player->upgrades['damage']);
    }

    #[Test]
    public function apply_upgrade_unknown_type_returns_false(): void
    {
        $player = $this->makePlayer();
        $this->assertFalse($player->applyUpgrade('nonexistent'));
    }

    #[Test]
    public function reset_for_round_restores_derived_stats(): void
    {
        $room = new Room('test');
        $input = new InputState;
        $player = new Player('p1', 'Tester', $input, $room->entities, $room, [
            'x' => 100.0,
            'y' => 100.0,
            'fireRate' => 0.5,
            'damage' => 2,
            'bulletCount' => 3,
            'bulletSpeed' => 900.0,
        ]);
        $player->applyUpgrade('rapid');
        $player->applyUpgrade('damage');
        $player->applyUpgrade('multishot');
        $player->applyUpgrade('speed');

        $player->resetForRound();

        $this->assertSame(['rapid' => 0, 'damage' => 0, 'multishot' => 0, 'speed' => 0], $player->upgrades);
        $this->assertSame(0.5, $player->fireRate);
        $this->assertSame(2, $player->damage);
        $this->assertSame(3, $player->bulletCount);
        $this->assertSame(900.0, $player->bulletSpeed);
    }

    #[Test]
    public function auto_aim_tracks_nearest_zombie(): void
    {
        $room = new Room('test');
        $input = new InputState(fire: true);
        $player = new Player('p1', 'Tester', $input, $room->entities, $room, ['x' => 100.0, 'y' => 100.0]);
        $room->addPlayer($player);
        $zombie = new Zombie(200.0, 100.0, $room->entities, $room, ['emergeTime' => 0.0]);
        $room->entities->append($zombie);
        $player->update(1.0 / 60.0);
        $bullets = $room->entities->findByKind('bullet');
        $this->assertNotEmpty($bullets);
    }
}