<?php

declare(strict_types=1);

namespace BattleForge\Tests\Integration;

use BattleForge\Http\CsrfToken;
use BattleForge\Http\Handlers\PostStartMatch;
use BattleForge\Http\Request;
use PHPUnit\Framework\TestCase;

final class PostStartMatchTest extends TestCase
{
    private const SECRET = 'unit-test-secret';

    public function testItRejectsARequestWithAMissingCsrfHeader(): void
    {
        $handler = new PostStartMatch();
        $request = $this->buildRequest('{}', '');
        $response = $handler->handle($request, ['id' => 'demo']);

        self::assertSame(403, $response->status);
    }

    public function testItAcceptsAValidScenarioAndReturnsTheInitialMatch(): void
    {
        [$token, $cookie] = CsrfToken::issue(self::SECRET);
        $handler = new PostStartMatch();
        $request = $this->buildRequest(
            rawBody: json_encode($this->validScenario(), JSON_THROW_ON_ERROR),
            csrfHeader: $token,
            cookies: ['__csrf' => $cookie, '__csrf_token' => $token],
        );
        $response = $handler->handle($request, ['id' => 'demo']);

        self::assertSame(200, $response->status);
        $body = json_decode($response->body, true);
        self::assertSame('alpha', $body['match']['activeTeamId'] ?? null);
        self::assertSame(1, $body['match']['round'] ?? null);
        self::assertCount(6, $body['match']['units'] ?? []);
        self::assertIsString($body['matchId'] ?? null);
        self::assertMatchesRegularExpression('/^[a-f0-9]{16,}$/', $body['matchId']);
        self::assertIsString($body['turnToken'] ?? null);
        self::assertMatchesRegularExpression('/^[a-f0-9]{32}$/', $body['turnToken']);
    }

    public function testItReturns400OnAnInvalidScenario(): void
    {
        [$token, $cookie] = CsrfToken::issue(self::SECRET);
        $handler = new PostStartMatch();
        $request = $this->buildRequest(
            rawBody: json_encode(['this' => 'is not a valid scenario'], JSON_THROW_ON_ERROR),
            csrfHeader: $token,
            cookies: ['__csrf' => $cookie, '__csrf_token' => $token],
        );
        $response = $handler->handle($request, ['id' => 'demo']);

        self::assertSame(400, $response->status);
    }

    public function testItReturnsATurnTokenValidForTheInitialMatchState(): void
    {
        [$token, $cookie] = CsrfToken::issue(self::SECRET);
        $handler = new PostStartMatch();
        $request = $this->buildRequest(
            rawBody: json_encode($this->validScenario(), JSON_THROW_ON_ERROR),
            csrfHeader: $token,
            cookies: ['__csrf' => $cookie, '__csrf_token' => $token],
        );
        $response = $handler->handle($request, ['id' => 'demo']);

        self::assertSame(200, $response->status);
        $body = json_decode($response->body, true);
        $matchId = $body['matchId'];
        $turnToken = $body['turnToken'];
        $lastActionIndex = count($body['match']['actionLog'] ?? []);

        self::assertTrue(\BattleForge\Application\TurnToken::verify(
            self::SECRET,
            $matchId,
            $body['match']['activeTeamId'],
            $body['match']['round'],
            $lastActionIndex,
            $turnToken,
        ));
    }

    /** @param array<string, string> $cookies */
    private function buildRequest(string $rawBody, string $csrfHeader, array $cookies = []): Request
    {
        $server = [
            'HTTP_X_CSRF_TOKEN' => $csrfHeader,
            '__csrf_secret' => self::SECRET,
            'CONTENT_TYPE' => 'application/json',
        ];

        return new Request([], [], [], $cookies, $server, '', 'POST', '/scenarios/demo/start', 'application/json', $rawBody);
    }

    /** @return array<string, mixed> */
    private function validScenario(): array
    {
        return [
            'id' => 'demo',
            'name' => 'Demo',
            'battlefieldWidth' => 8,
            'battlefieldHeight' => 8,
            'battlefieldTerrain' => [],
            'teamA' => [
                'units' => [
                    ['id' => 'a1', 'archetype' => 'defender', 'maxHealth' => 12, 'attack' => 3, 'defense' => 4, 'speed' => 2, 'x' => 0, 'y' => 0],
                    ['id' => 'a2', 'archetype' => 'defender', 'maxHealth' => 12, 'attack' => 3, 'defense' => 4, 'speed' => 2, 'x' => 1, 'y' => 0],
                    ['id' => 'a3', 'archetype' => 'defender', 'maxHealth' => 12, 'attack' => 3, 'defense' => 4, 'speed' => 2, 'x' => 2, 'y' => 0],
                ],
            ],
            'teamB' => [
                'units' => [
                    ['id' => 'b1', 'archetype' => 'striker', 'maxHealth' => 8, 'attack' => 5, 'defense' => 2, 'speed' => 3, 'x' => 7, 'y' => 7],
                    ['id' => 'b2', 'archetype' => 'striker', 'maxHealth' => 8, 'attack' => 5, 'defense' => 2, 'speed' => 3, 'x' => 6, 'y' => 7],
                    ['id' => 'b3', 'archetype' => 'striker', 'maxHealth' => 8, 'attack' => 5, 'defense' => 2, 'speed' => 3, 'x' => 5, 'y' => 7],
                ],
            ],
            'victoryCondition' => 'eliminate_all',
            'holdRoundsRequired' => 1,
        ];
    }
}