<?php

declare(strict_types=1);

namespace BattleForge\Tests\Unit\Domain;

use BattleForge\Domain\Archetype;
use BattleForge\Domain\Battlefield;
use BattleForge\Domain\DeploymentZone;
use BattleForge\Domain\MatchState;
use BattleForge\Domain\ObjectiveMarker;
use BattleForge\Domain\Position;
use BattleForge\Domain\Scenario;
use BattleForge\Domain\UnitState;
use BattleForge\Domain\VictoryCondition;
use InvalidArgumentException;
use PHPUnit\Framework\TestCase;

final class ScenarioTest extends TestCase
{
    public function testItRejectsNonListUnits(): void
    {
        $this->expectException(InvalidArgumentException::class);

        new Scenario(
            id: 'demo',
            name: 'Demo',
            battlefield: new Battlefield(8, 8),
            units: ['alpha-1' => $this->unit('alpha-1', 'alpha', new Position(0, 0))], // @phpstan-ignore argument.type (Test fixture intentionally passes a non-list units array to verify constructor validation.)
            deploymentZones: ['alpha' => new DeploymentZone('alpha', [new Position(0, 0)])],
            objectives: [],
            victoryCondition: VictoryCondition::EliminateAll,
            holdRoundsRequired: 1,
        );
    }

    public function testItRejectsTeamsOutsideTheThreeToSixSizeWindow(): void
    {
        $this->expectException(InvalidArgumentException::class);
        $this->expectExceptionMessage('Team alpha must have between 3 and 6 units.');

        $units = [
            $this->unit('alpha-1', 'alpha', new Position(0, 0)),
            $this->unit('alpha-2', 'alpha', new Position(1, 0)),
            $this->unit('bravo-1', 'bravo', new Position(7, 7)),
            $this->unit('bravo-2', 'bravo', new Position(6, 7)),
            $this->unit('bravo-3', 'bravo', new Position(5, 7)),
        ];

        new Scenario(
            id: 'demo',
            name: 'Demo',
            battlefield: new Battlefield(8, 8),
            units: $units,
            deploymentZones: [
                'alpha' => new DeploymentZone('alpha', [new Position(0, 0), new Position(1, 0)]),
                'bravo' => new DeploymentZone('bravo', [new Position(7, 7), new Position(6, 7), new Position(5, 7)]),
            ],
            objectives: [],
            victoryCondition: VictoryCondition::EliminateAll,
            holdRoundsRequired: 1,
        );
    }

    public function testItRejectsAbilitiesOutsideTheArchetypeAllowlist(): void
    {
        $this->expectException(InvalidArgumentException::class);
        $this->expectExceptionMessage('Unit alpha-1 has an ability that its archetype forbids.');

        $bad = $this->unit('alpha-1', 'alpha', new Position(0, 0), archetype: Archetype::Scout, abilities: ['heal'], attack: 3, defense: 1, speed: 5, maxHealth: 6);
        $alpha2 = $this->unit('alpha-2', 'alpha', new Position(1, 0));
        $alpha3 = $this->unit('alpha-3', 'alpha', new Position(2, 0));
        $bravo = $this->unit('bravo-1', 'bravo', new Position(7, 7));
        $bravo2 = $this->unit('bravo-2', 'bravo', new Position(6, 7));
        $bravo3 = $this->unit('bravo-3', 'bravo', new Position(5, 7));

        new Scenario(
            id: 'demo',
            name: 'Demo',
            battlefield: new Battlefield(8, 8),
            units: [$bad, $alpha2, $alpha3, $bravo, $bravo2, $bravo3],
            deploymentZones: [
                'alpha' => new DeploymentZone('alpha', [new Position(0, 0), new Position(1, 0), new Position(2, 0)]),
                'bravo' => new DeploymentZone('bravo', [new Position(7, 7), new Position(6, 7), new Position(5, 7)]),
            ],
            objectives: [],
            victoryCondition: VictoryCondition::EliminateAll,
            holdRoundsRequired: 1,
        );
    }

    public function testItRejectsUnitsOutsideTheirDeploymentZone(): void
    {
        $this->expectException(InvalidArgumentException::class);
        $this->expectExceptionMessage('Unit alpha-1 must start inside team alpha deployment zone.');

        $bad = $this->unit('alpha-1', 'alpha', new Position(3, 0));
        $alpha2 = $this->unit('alpha-2', 'alpha', new Position(0, 0));
        $alpha3 = $this->unit('alpha-3', 'alpha', new Position(1, 0));
        $bravo = $this->unit('bravo-1', 'bravo', new Position(7, 7));
        $bravo2 = $this->unit('bravo-2', 'bravo', new Position(6, 7));
        $bravo3 = $this->unit('bravo-3', 'bravo', new Position(5, 7));

        new Scenario(
            id: 'demo',
            name: 'Demo',
            battlefield: new Battlefield(8, 8),
            units: [$bad, $alpha2, $alpha3, $bravo, $bravo2, $bravo3],
            deploymentZones: [
                'alpha' => new DeploymentZone('alpha', [new Position(0, 0), new Position(1, 0), new Position(2, 0)]),
                'bravo' => new DeploymentZone('bravo', [new Position(7, 7), new Position(6, 7), new Position(5, 7)]),
            ],
            objectives: [],
            victoryCondition: VictoryCondition::EliminateAll,
            holdRoundsRequired: 1,
        );
    }

    public function testHoldObjectiveRequiresExactlyOneObjective(): void
    {
        $this->expectException(InvalidArgumentException::class);
        $this->expectExceptionMessage('Hold objective victory requires exactly one objective.');

        $units = $this->validUnitSet();
        $zones = $this->validZones();

        new Scenario(
            id: 'demo',
            name: 'Demo',
            battlefield: new Battlefield(8, 8),
            units: $units,
            deploymentZones: $zones,
            objectives: [],
            victoryCondition: VictoryCondition::HoldObjective,
            holdRoundsRequired: 3,
        );
    }

    public function testStartMatchReturnsAFreshMatchStateWithResetUnits(): void
    {
        $scenario = $this->validScenario();

        $match = $scenario->startMatch('alpha');

        self::assertInstanceOf(MatchState::class, $match);
        self::assertSame('alpha', $match->activeTeamId);
        self::assertSame(1, $match->round);
        self::assertNull($match->winnerTeamId);
        foreach ($match->units as $unit) {
            self::assertSame(2, $unit->actionsRemaining);
            self::assertFalse($unit->hasAttacked);
            self::assertSame(0, $unit->attackBonus);
            self::assertFalse($unit->hasUsedAbility);
        }
    }

    public function testStartMatchDoesNotShareUnitInstancesWithTheScenario(): void
    {
        $scenario = $this->validScenario();

        $match = $scenario->startMatch('alpha');

        $original = $scenario->units[0];
        $fromMatch = $match->unit($original->id);

        self::assertNotSame($original, $fromMatch);
        self::assertSame($original->id, $fromMatch->id);
    }

    /** @return list<UnitState> */
    private function validUnitSet(): array
    {
        return [
            $this->unit('alpha-1', 'alpha', new Position(0, 0)),
            $this->unit('alpha-2', 'alpha', new Position(1, 0)),
            $this->unit('alpha-3', 'alpha', new Position(2, 0)),
            $this->unit('bravo-1', 'bravo', new Position(7, 7)),
            $this->unit('bravo-2', 'bravo', new Position(6, 7)),
            $this->unit('bravo-3', 'bravo', new Position(5, 7)),
        ];
    }

    /** @return array<string, DeploymentZone> */
    private function validZones(): array
    {
        return [
            'alpha' => new DeploymentZone('alpha', [
                new Position(0, 0),
                new Position(1, 0),
                new Position(2, 0),
            ]),
            'bravo' => new DeploymentZone('bravo', [
                new Position(7, 7),
                new Position(6, 7),
                new Position(5, 7),
            ]),
        ];
    }

    private function validScenario(): Scenario
    {
        return new Scenario(
            id: 'demo',
            name: 'Demo',
            battlefield: new Battlefield(8, 8),
            units: $this->validUnitSet(),
            deploymentZones: $this->validZones(),
            objectives: [],
            victoryCondition: VictoryCondition::EliminateAll,
            holdRoundsRequired: 1,
        );
    }

    /**
     * @param list<string> $abilities
     */
    private function unit(
        string $id,
        string $team,
        Position $position,
        Archetype $archetype = Archetype::Defender,
        array $abilities = [],
        int $attack = 4,
        int $defense = 3,
        int $speed = 3,
        int $maxHealth = 10,
    ): UnitState {
        return new UnitState(
            $id,
            $team,
            $position,
            $maxHealth,
            $maxHealth,
            $attack,
            $defense,
            $speed,
            2,
            false,
            $archetype,
            $abilities,
            0,
            false,
        );
    }
}