<?php

declare(strict_types=1);

namespace BattleForge\Tests\Integration;

use BattleForge\Http\CsrfToken;
use PHPUnit\Framework\TestCase;

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

    protected function setUp(): void
    {
        // Reset superglobals between requests.
        $_GET = [];
        $_POST = [];
        $_FILES = [];
        $_COOKIE = [];
        $_SERVER = [];
    }

    public function testTheFullCreateAndSaveFlow(): void
    {
        [$token, $cookie] = CsrfToken::issue(self::SECRET);
        // Use a deterministic secret so the upload token HMAC matches between upload and fetch.
        putenv('BATTLEFORGE_SECRET=' . self::SECRET);

        try {
            // Step 1: GET home page.
            $_SERVER['REQUEST_METHOD'] = 'GET';
            $_SERVER['REQUEST_URI'] = '/';
            $homeBody = $this->runFrontController();
            self::assertStringContainsString('New scenario', $homeBody);
            self::assertStringContainsString('name="csrf-token"', $homeBody);

            // Step 2: POST team editor.
            $_COOKIE['__csrf'] = $cookie;
            $_SERVER['REQUEST_METHOD'] = 'POST';
            $_SERVER['REQUEST_URI'] = '/scenarios/demo/edit/team';
            $_SERVER['CONTENT_TYPE'] = 'application/x-www-form-urlencoded';
            $_SERVER['__csrf_secret'] = self::SECRET;
            $_POST = $this->validTeamPost($token);
            $teamBody = $this->runFrontController();
            self::assertSame(200, $this->lastStatus);
            self::assertStringContainsString('localStorage.setItem', $teamBody);
            self::assertStringContainsString('scenario:demo', $teamBody);

            // Step 3: POST battlefield editor.
            $_SERVER['REQUEST_METHOD'] = 'POST';
            $_SERVER['REQUEST_URI'] = '/scenarios/demo/edit/battlefield';
            $_SERVER['CONTENT_TYPE'] = 'application/json';
            $_SERVER['HTTP_X_CSRF_TOKEN'] = $token;
            $_POST = [];
            $this->rawBody = json_encode($this->validBattlefieldPayload(), JSON_THROW_ON_ERROR);
            $_SERVER['__raw_body'] = $this->rawBody;
            $bfBody = $this->runFrontController();
            self::assertSame(200, $this->lastStatus);
            $bfJson = json_decode($bfBody, true);
            self::assertSame(true, $bfJson['ok'] ?? null);

            // Step 4: POST start-match.
            $_SERVER['REQUEST_METHOD'] = 'POST';
            $_SERVER['REQUEST_URI'] = '/scenarios/demo/start';
            $this->rawBody = json_encode($this->validBattlefieldPayload(), JSON_THROW_ON_ERROR);
            $_SERVER['__raw_body'] = $this->rawBody;
            $startBody = $this->runFrontController();
            self::assertSame(200, $this->lastStatus);
            $startJson = json_decode($startBody, true);
            self::assertSame('alpha', $startJson['match']['activeTeamId'] ?? null);
            self::assertSame(1, $startJson['match']['round'] ?? null);
            self::assertCount(6, $startJson['match']['units'] ?? []);

            // Step 5: POST image upload, then GET the returned URL.
            $this->uploadAndFetchAsset();
        } finally {
            // Always purge the per-install uploads dir after the test.
            $uploadsRoot = __DIR__ . '/../../var/uploads';
            if (is_dir($uploadsRoot)) {
                foreach (glob($uploadsRoot . '/*/*') as $file) {
                    @unlink($file);
                }
                foreach (glob($uploadsRoot . '/*') as $dir) {
                    @rmdir($dir);
                }
            }
        }
    }

    private function uploadAndFetchAsset(): void
    {
        $expectedToken = hash_hmac('sha256', self::SECRET, 'bf-uploads');
        $expectedDir = realpath(__DIR__ . '/../../var/uploads') ?: (__DIR__ . '/../../var/uploads');

        // Create the multipart body manually so we can pre-compute the file we expect to find.
        $png = base64_decode(
            'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR4nGNgYGBgAAAABQABh6FO1AAAAABJRU5ErkJggg==',
            true,
        );
        $tmp = tempnam(sys_get_temp_dir(), 'bf-upload-');
        file_put_contents($tmp, $png);

        try {
            [$token, $cookie] = CsrfToken::issue(self::SECRET);
            $_COOKIE['__csrf'] = $cookie;
            $_SERVER['REQUEST_METHOD'] = 'POST';
            $_SERVER['REQUEST_URI'] = '/assets/upload';
            $_SERVER['CONTENT_TYPE'] = 'multipart/form-data; boundary=----test';
            $_SERVER['__csrf_secret'] = self::SECRET;
            $_POST = ['_csrf' => $token];
            $_FILES = [
                'image' => [
                    'name' => 'test.png',
                    'type' => 'image/png',
                    'tmp_name' => $tmp,
                    'error' => 0,
                    'size' => strlen($png),
                ],
            ];
            $this->rawBody = '';
            $_SERVER['__raw_body'] = '';
            $body = $this->runFrontController();
            self::assertSame(200, $this->lastStatus, 'upload response: ' . $body);
            $payload = json_decode($body, true);
            $url = is_array($payload) ? (string) ($payload['url'] ?? '') : '';
            self::assertNotSame('', $url);
            self::assertStringStartsWith('/assets/uploads/' . $expectedToken . '/', $url);

            // Now fetch the asset back through the front controller.
            $_COOKIE = [];
            $_POST = [];
            $_FILES = [];
            $_SERVER['REQUEST_METHOD'] = 'GET';
            $_SERVER['REQUEST_URI'] = $url;
            unset($_SERVER['CONTENT_TYPE'], $_SERVER['HTTP_X_CSRF_TOKEN'], $_SERVER['__raw_body']);
            $this->rawBody = '';
            $fetchBody = $this->runFrontController();
            self::assertSame(200, $this->lastStatus, 'fetch response: ' . $fetchBody);
            self::assertSame($png, $fetchBody);

            // Clean up the uploaded file so the outer finally does not loop on it.
            $filename = substr($url, strlen('/assets/uploads/' . $expectedToken . '/'));
            @unlink($expectedDir . '/' . $expectedToken . '/' . $filename);
        } finally {
            @unlink($tmp);
        }
    }

    private string $rawBody = '';
    private int $lastStatus = 0;

    private function runFrontController(): string
    {
        $this->lastStatus = 0;
        $body = $this->captureOutput(function (): void {
            $this->lastStatus = (require __DIR__ . '/../../public/index.php') ?? http_response_code();
        });
        return $body;
    }

    /** @param callable(): void $fn */
    private function captureOutput(callable $fn): string
    {
        ob_start();
        try {
            $fn();
        } finally {
            $output = (string) ob_get_clean();
        }
        return $output;
    }

    /** @return array<string, mixed> */
    private function validTeamPost(string $token): array
    {
        return [
            '_csrf' => $token,
            'id' => 'demo',
            'name' => 'Demo',
            'battlefieldWidth' => '8',
            'battlefieldHeight' => '8',
            'teamA' => ['units' => $this->unitRows('a', 0, 2, 0)],
            'teamB' => ['units' => $this->unitRows('b', 5, 7, 7)],
            'victoryCondition' => 'eliminate_all',
            'holdRoundsRequired' => '1',
        ];
    }

    /** @return array<string, mixed> */
    private function validBattlefieldPayload(): array
    {
        return [
            'id' => 'demo',
            'name' => 'Demo',
            'battlefieldWidth' => 8,
            'battlefieldHeight' => 8,
            'battlefieldTerrain' => [],
            'teamA' => ['units' => $this->unitRows('a', 0, 2, 0)],
            'teamB' => ['units' => $this->unitRows('b', 5, 7, 7)],
            'victoryCondition' => 'eliminate_all',
            'holdRoundsRequired' => 1,
        ];
    }

    /**
     * @return list<array<string, string|int>>
     */
    private function unitRows(string $teamPrefix, int $xStart, int $xEnd, int $y): array
    {
        $rows = [];
        for ($i = 0; $i <= $xEnd - $xStart; $i++) {
            $rows[] = [
                'id' => "{$teamPrefix}{$i}",
                'archetype' => 'defender',
                'maxHealth' => 12,
                'attack' => 3,
                'defense' => 4,
                'speed' => 2,
                'x' => $xStart + $i,
                'y' => $y,
            ];
        }
        return $rows;
    }
}