<?php

namespace MintyPHP\Tests\Architecture;

use PHPUnit\Framework\TestCase;

/**
 * Every `initDetailDrawer({ fetchUrl })` consumer must expose a matching
 * fragment endpoint following the convention:
 *   <route>-fragment($id).php          ← action
 *   <route>-fragment(none).phtml       ← view (no-layout)
 *
 * This test scans JS files for `initDetailDrawer` calls, extracts the fragment
 * path from the fetchUrl template literal, and verifies both files exist.
 */
class DetailDrawerFragmentContractTest extends TestCase
{
    use ProjectFileAssertionSupport;

    public function testEveryDrawerConsumerHasMatchingFragmentEndpoint(): void
    {
        $root = $this->projectRootPath();
        $scanRoots = ['web/js', 'modules'];

        $consumers = [];

        foreach ($scanRoots as $scanRoot) {
            $basePath = $root . '/' . $scanRoot;
            if (!is_dir($basePath)) {
                continue;
            }

            $iterator = new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($basePath, \FilesystemIterator::SKIP_DOTS));
            /** @var \SplFileInfo $file */
            foreach ($iterator as $file) {
                if (!$file->isFile() || $file->getExtension() !== 'js') {
                    continue;
                }
                // Exclude the drawer implementation itself.
                $relativePath = str_replace($root . '/', '', $file->getPathname());
                if ($relativePath === 'web/js/components/app-detail-drawer.js') {
                    continue;
                }

                $content = file_get_contents($file->getPathname());
                if ($content === false || !str_contains($content, 'initDetailDrawer(')) {
                    continue;
                }

                // Find `fetchUrl: (uuid) => new URL(`<path>/${uuid}`, ...)` — extract <path>.
                // The path must contain "-fragment" per the convention.
                if (preg_match_all(
                    '/fetchUrl\s*:\s*\([^)]*\)\s*=>\s*new\s+URL\s*\(\s*`([^`${]+)\$\{[^}]+\}[^`]*`/',
                    $content,
                    $matches
                )) {
                    foreach ($matches[1] as $prefix) {
                        $prefix = rtrim($prefix, '/');
                        $consumers[$prefix] = $relativePath;
                    }
                }
            }
        }

        $this->assertNotEmpty(
            $consumers,
            'No initDetailDrawer fetchUrl patterns found. Either the convention changed or the regex is stale.'
        );

        $violations = [];

        foreach ($consumers as $fragmentPath => $consumerFile) {
            if (!str_contains($fragmentPath, '-fragment')) {
                $violations[] = sprintf(
                    "Fragment path does not follow *-fragment convention: %s (in %s)",
                    $fragmentPath,
                    $consumerFile
                );
                continue;
            }

            [$actionFound, $viewFound, $searchedDirs] = $this->locateFragmentFiles($fragmentPath);

            if (!$actionFound) {
                $violations[] = sprintf(
                    "Missing action file for fragment path '%s'. Expected somewhere like:\n    pages/%s(\$id).php\n    modules/*/pages/%s(\$id).php\nSearched in: %s\n(Consumer: %s)",
                    $fragmentPath,
                    $fragmentPath,
                    $fragmentPath,
                    implode(', ', $searchedDirs),
                    $consumerFile
                );
            }
            if (!$viewFound) {
                $violations[] = sprintf(
                    "Missing (none) view file for fragment path '%s'. Expected:\n    %s(none).phtml\nSearched in: %s\n(Consumer: %s)",
                    $fragmentPath,
                    $fragmentPath,
                    implode(', ', $searchedDirs),
                    $consumerFile
                );
            }
        }

        $this->assertSame(
            [],
            $violations,
            "Detail-drawer fragment-contract violations:\n" . implode("\n", $violations)
        );
    }

    /**
     * AuthZ-Parity: a drawer fragment must enforce the same authorization as
     * its full-page counterpart (CLAUDE.md: "Must enforce auth + scope exactly
     * like the full-page view"). This test extracts authorize / requireAbility
     * arguments from each fragment and compares them to the matched counterpart.
     *
     * Allowlist of semantic equivalences (verified manually against codebase):
     *   - admin/users/view-fragment ↔ admin/users/edit
     *       Reason: there is no view($id).php under pages/admin/users/, so the
     *       full-page detail action is edit. The fragment uses ABILITY_VIEW;
     *       edit uses ABILITY_EDIT_CONTEXT — semantically the fragment is the
     *       read-only subset of the edit context. Documented anomaly.
     *   - addressbook/view-fragment ↔ addressbook/view
     *       Reason: both call requireAbilityOrForbidden(ABILITY_VIEW).
     *   - helpdesk/ticket-fragment ↔ helpdesk/ticket
     *       Reason: both call requireAbilityOrForbidden(ABILITY_ACCESS).
     *
     * The test fails explicitly if an authorize/requireAbility call is nested
     * inside an if/else block (not statically extractable) — a parity check
     * cannot be made automatically in that case.
     */
    public function testFragmentAuthzMatchesFullPage(): void
    {
        $root = $this->projectRootPath();

        // counterpart map: fragment-relative-path => full-page-relative-path
        $pairs = [
            'pages/admin/users/view-fragment($id).php' => 'pages/admin/users/edit($id).php',
            'modules/addressbook/pages/address-book/view-fragment($id).php' => 'modules/addressbook/pages/address-book/view($id).php',
            'modules/helpdesk/pages/helpdesk/ticket-fragment($id).php' => 'modules/helpdesk/pages/helpdesk/ticket($id).php',
        ];

        // semantic-equivalence allowlist — full-page ability => fragment ability accepted as parity
        $equivalents = [
            'UserAuthorizationPolicy::ABILITY_ADMIN_USERS_EDIT_CONTEXT' => ['UserAuthorizationPolicy::ABILITY_ADMIN_USERS_VIEW'],
        ];

        $violations = [];

        foreach ($pairs as $fragmentRel => $fullPageRel) {
            $fragmentPath = $root . '/' . $fragmentRel;
            $fullPagePath = $root . '/' . $fullPageRel;

            $this->assertFileExists($fragmentPath, "Fragment file missing: {$fragmentRel}");
            $this->assertFileExists($fullPagePath, "Full-page file missing: {$fullPageRel}");

            $fragmentAbility = $this->extractTopLevelAbility((string) file_get_contents($fragmentPath), $fragmentRel, $violations);
            $fullPageAbility = $this->extractTopLevelAbility((string) file_get_contents($fullPagePath), $fullPageRel, $violations);

            if ($fragmentAbility === null || $fullPageAbility === null) {
                continue; // already recorded as violation
            }

            // Strip leading namespace separators for comparison resilience.
            $fragNorm = ltrim($fragmentAbility, '\\');
            $fullNorm = ltrim($fullPageAbility, '\\');

            if ($fragNorm === $fullNorm) {
                continue;
            }

            $accepted = $equivalents[$fullNorm] ?? [];
            if (in_array($fragNorm, $accepted, true)) {
                continue;
            }

            $violations[] = sprintf(
                "AuthZ parity mismatch: %s requires '%s' but full-page %s requires '%s' (no documented allowlist entry).",
                $fragmentRel,
                $fragNorm,
                $fullPageRel,
                $fullNorm
            );
        }

        $this->assertSame([], $violations, "Drawer-fragment AuthZ-parity violations:\n" . implode("\n", $violations));
    }

    /**
     * Extract the first top-level (non-nested) authorize / requireAbility ability
     * argument from a PHP source string. Returns null and records a violation
     * when no statically extractable call is found.
     */
    private function extractTopLevelAbility(string $source, string $fileRel, array &$violations): ?string
    {
        // Strip block comments and line comments to avoid false matches.
        $stripped = preg_replace('/\/\*.*?\*\//s', '', $source) ?? $source;
        $stripped = preg_replace('/\/\/[^\n]*/', '', $stripped) ?? $stripped;

        $lines = explode("\n", $stripped);
        $depth = 0;
        $hasTopLevelMatch = false;
        $hasNestedMatch = false;
        $extracted = null;

        foreach ($lines as $line) {
            // Update brace depth AFTER matching this line so a `{` on the same
            // line as an authorize call (rare) still counts as top-level.
            $matchPattern = '/(?:Guard::requireAbility(?:OrForbidden|DecisionOrForbidden)?|->authorize|::authorize)\s*\(\s*([A-Za-z_\\\\][A-Za-z0-9_\\\\:]*)/';
            if (preg_match($matchPattern, $line, $m)) {
                if ($depth === 0) {
                    if (!$hasTopLevelMatch) {
                        $extracted = $m[1];
                        $hasTopLevelMatch = true;
                    }
                } else {
                    $hasNestedMatch = true;
                }
            }
            $opens = substr_count($line, '{');
            $closes = substr_count($line, '}');
            $depth += $opens - $closes;
            if ($depth < 0) {
                $depth = 0;
            }
        }

        if (!$hasTopLevelMatch) {
            if ($hasNestedMatch) {
                $violations[] = sprintf(
                    "Cannot verify parity when authorization is conditional — review manually: %s",
                    $fileRel
                );
            } else {
                $violations[] = sprintf(
                    "No authorize/requireAbility call found in %s — fragment must enforce auth.",
                    $fileRel
                );
            }
            return null;
        }

        return $extracted;
    }

    /**
     * @return array{0: bool, 1: bool, 2: list<string>}  [actionFound, viewFound, searchedDirs]
     */
    private function locateFragmentFiles(string $fragmentPath): array
    {
        $root = $this->projectRootPath();
        $searchBases = [$root . '/pages'];
        $modulesDir = $root . '/modules';
        if (is_dir($modulesDir)) {
            foreach (scandir($modulesDir) ?: [] as $moduleEntry) {
                if ($moduleEntry === '.' || $moduleEntry === '..') {
                    continue;
                }
                $modulePages = $modulesDir . '/' . $moduleEntry . '/pages';
                if (is_dir($modulePages)) {
                    $searchBases[] = $modulePages;
                }
            }
        }

        $actionFound = false;
        $viewFound = false;

        foreach ($searchBases as $base) {
            $actionCandidate = $base . '/' . $fragmentPath . '($id).php';
            $viewCandidate = $base . '/' . $fragmentPath . '(none).phtml';
            if (is_file($actionCandidate)) {
                $actionFound = true;
            }
            if (is_file($viewCandidate)) {
                $viewFound = true;
            }
        }

        return [$actionFound, $viewFound, $searchBases];
    }
}