<?php

namespace App\Http\Controllers\Webhook;

use App\Actions\Application\CleanupPreviewDeployment;
use App\Http\Controllers\Controller;
use App\Http\Controllers\Webhook\Concerns\DetectsSkipDeployCommits;
use App\Http\Controllers\Webhook\Concerns\MatchesManualWebhookApplications;
use App\Livewire\Source\Gitlab\Change as GitlabSource;
use App\Models\Application;
use App\Models\ApplicationPreview;
use App\Models\GitlabApp;
use Exception;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Str;

class Gitlab extends Controller
{
    use DetectsSkipDeployCommits;
    use MatchesManualWebhookApplications;

    public function redirect(Request $request)
    {
        try {
            $code = $request->query('code');
            $state = $request->query('state');

            if (! $code || ! $state) {
                return redirect()->route('source.all')->with('error', 'Invalid GitLab OAuth callback. Missing code or state.');
            }

            // Validate the one-time, team-bound state (not a guessable source UUID) to stop forged callbacks from overwriting a source's tokens.
            $payload = Cache::pull(GitlabSource::oauthStateCacheKey($state));
            $team_id = $request->user()?->currentTeam()?->id;
            if (! is_array($payload) || is_null($team_id) || (int) data_get($payload, 'team_id') !== (int) $team_id) {
                return redirect()->route('source.all')->with('error', 'Invalid or expired GitLab OAuth state. Please start the authorization again.');
            }

            $gitlabApp = GitlabApp::whereKey(data_get($payload, 'gitlab_app_id'))->firstOrFail();

            // Only users who may administer the source can complete OAuth and store tokens.
            if (! $request->user()->can('update', $gitlabApp)) {
                return redirect()->route('source.all')->with('error', 'You are not authorized to connect this GitLab App.');
            }

            $baseUrl = rtrim($gitlabApp->html_url, '/');

            $response = Http::asForm()->post("{$baseUrl}/oauth/token", [
                'client_id' => $gitlabApp->client_id,
                'client_secret' => $gitlabApp->client_secret,
                'code' => $code,
                'grant_type' => 'authorization_code',
                'redirect_uri' => $gitlabApp->redirect_uri,
            ]);

            if (! $response->successful()) {
                $error = data_get($response->json(), 'error_description', 'Token exchange failed');

                return redirect()->route('source.gitlab.show', ['gitlab_app_uuid' => $gitlabApp->uuid])
                    ->with('error', "GitLab OAuth failed: {$error}");
            }

            $data = $response->json();
            $gitlabApp->update([
                'access_token' => $data['access_token'],
                'refresh_token' => $data['refresh_token'],
                'expires_at' => time() + ($data['expires_in'] ?? 7200),
            ]);

            return redirect()->route('source.gitlab.show', ['gitlab_app_uuid' => $gitlabApp->uuid]);
        } catch (Exception $e) {
            return redirect()->route('source.all')->with('error', $e->getMessage());
        }
    }

    public function normal(Request $request)
    {
        try {
            $return_payloads = collect([]);
            $payload = $request->collect();
            $x_gitlab_token = $request->header('X-Gitlab-Token');
            $object_kind = data_get($payload, 'object_kind');
            $project_id = data_get($payload, 'project.id');

            $allowed_events = ['push', 'merge_request'];
            if (! in_array($object_kind, $allowed_events)) {
                return response([
                    'status' => 'failed',
                    'message' => 'Event not allowed. Only push and merge_request events are allowed.',
                ]);
            }

            if (empty($x_gitlab_token)) {
                auditLogWebhookFailure('gitlab', 'webhook_token_missing', [
                    'event' => $object_kind,
                ]);

                return response([
                    'status' => 'failed',
                    'message' => 'Missing X-Gitlab-Token header.',
                ], 401);
            }

            $gitlab_app = GitlabApp::findByWebhookToken($x_gitlab_token);
            if (! $gitlab_app) {
                auditLogWebhookFailure('gitlab', 'invalid_token', [
                    'event' => $object_kind,
                ]);

                return response([
                    'status' => 'failed',
                    'message' => 'Invalid webhook token.',
                ], 401);
            }

            $applications = Application::where('source_id', $gitlab_app->id)
                ->where('source_type', GitlabApp::class)
                ->where('repository_project_id', $project_id);

            if ($object_kind === 'push') {
                $branch = data_get($payload, 'ref');
                if (Str::isMatch('/refs\/heads\/*/', $branch)) {
                    $branch = Str::after($branch, 'refs/heads/');
                }
                if (! $branch) {
                    return response([
                        'status' => 'failed',
                        'message' => 'No branch found in the request.',
                    ]);
                }

                $applications = $applications->where('git_branch', $branch)->get();
                $added_files = data_get($payload, 'commits.*.added');
                $removed_files = data_get($payload, 'commits.*.removed');
                $modified_files = data_get($payload, 'commits.*.modified');
                $changed_files = collect($added_files)->concat($removed_files)->concat($modified_files)->unique()->flatten();
                $skip_deploy_commits = self::shouldSkipDeploy(data_get($payload, 'commits.*.message', []));

                foreach ($applications as $application) {
                    if (! $application->destination->server->isFunctional()) {
                        $return_payloads->push([
                            'application' => $application->name,
                            'status' => 'failed',
                            'message' => 'Server is not functional',
                        ]);

                        continue;
                    }

                    if (! $application->isDeployable()) {
                        $return_payloads->push([
                            'application' => $application->name,
                            'status' => 'failed',
                            'message' => 'Deployments disabled',
                        ]);

                        continue;
                    }

                    $is_watch_path_triggered = $application->isWatchPathsTriggered($changed_files);
                    if (! $is_watch_path_triggered && ! blank($application->watch_paths)) {
                        $return_payloads->push([
                            'application' => $application->name,
                            'status' => 'failed',
                            'message' => 'Changed files do not match watch paths.',
                        ]);

                        continue;
                    }

                    if ($skip_deploy_commits) {
                        $return_payloads->push([
                            'application' => $application->name,
                            'status' => 'skipped',
                            'message' => 'All commits contain [skip cd] or [skip ci].',
                        ]);

                        continue;
                    }

                    $deployment_uuid = new Cuid2;
                    $result = queue_application_deployment(
                        application: $application,
                        deployment_uuid: $deployment_uuid,
                        commit: data_get($payload, 'after', 'HEAD'),
                        force_rebuild: false,
                        is_webhook: true,
                    );

                    if ($result['status'] === 'queue_full') {
                        return response($result['message'], 429)->header('Retry-After', 60);
                    }

                    auditLog('webhook.deployment.queued', [
                        'provider' => 'gitlab',
                        'mode' => 'app',
                        'application_uuid' => $application->uuid,
                        'application_name' => $application->name,
                        'deployment_uuid' => $deployment_uuid->toString(),
                        'commit' => data_get($payload, 'after'),
                    ]);

                    $return_payloads->push([
                        'application' => $application->name,
                        'status' => $result['status'] ?? 'success',
                        'message' => $result['message'] ?? 'Deployment queued.',
                    ]);
                }
            }

            if ($object_kind === 'merge_request') {
                $action = data_get($payload, 'object_attributes.action');
                $branch = data_get($payload, 'object_attributes.source_branch');
                $base_branch = data_get($payload, 'object_attributes.target_branch');
                $pull_request_id = data_get($payload, 'object_attributes.iid');
                $pull_request_html_url = data_get($payload, 'object_attributes.url');
                $pull_request_title = data_get($payload, 'object_attributes.title');
                $latest_commit_message = data_get($payload, 'object_attributes.last_commit.message');
                $skip_deploy_pr = self::shouldSkipDeployAny([$pull_request_title, $latest_commit_message]);

                $applications = $applications->where('git_branch', $base_branch)->get();

                foreach ($applications as $application) {
                    if (! $application->destination->server->isFunctional()) {
                        $return_payloads->push([
                            'application' => $application->name,
                            'status' => 'failed',
                            'message' => 'Server is not functional',
                        ]);

                        continue;
                    }

                    if (in_array($action, ['open', 'opened', 'synchronize', 'reopened', 'reopen', 'update'])) {
                        if (! $application->isPRDeployable()) {
                            $return_payloads->push([
                                'application' => $application->name,
                                'status' => 'failed',
                                'message' => 'Preview deployments disabled',
                            ]);

                            continue;
                        }

                        if ($skip_deploy_pr) {
                            $return_payloads->push([
                                'application' => $application->name,
                                'status' => 'skipped',
                                'message' => 'PR title or latest commit contains [skip cd] or [skip ci].',
                            ]);

                            continue;
                        }

                        $deployment_uuid = new Cuid2;
                        $found = ApplicationPreview::where('application_id', $application->id)
                            ->where('pull_request_id', $pull_request_id)
                            ->first();

                        if (! $found) {
                            if ($application->build_pack === 'dockercompose') {
                                $pr_app = ApplicationPreview::create([
                                    'git_type' => 'gitlab',
                                    'application_id' => $application->id,
                                    'pull_request_id' => $pull_request_id,
                                    'pull_request_html_url' => $pull_request_html_url,
                                    'docker_compose_domains' => $application->docker_compose_domains,
                                ]);
                                $pr_app->generate_preview_fqdn_compose();
                            } else {
                                $pr_app = ApplicationPreview::create([
                                    'git_type' => 'gitlab',
                                    'application_id' => $application->id,
                                    'pull_request_id' => $pull_request_id,
                                    'pull_request_html_url' => $pull_request_html_url,
                                ]);
                                $pr_app->generate_preview_fqdn();
                            }
                        }

                        $result = queue_application_deployment(
                            application: $application,
                            pull_request_id: $pull_request_id,
                            deployment_uuid: $deployment_uuid,
                            commit: data_get($payload, 'object_attributes.last_commit.id', 'HEAD'),
                            force_rebuild: false,
                            is_webhook: true,
                            git_type: 'gitlab',
                        );

                        if ($result['status'] === 'queue_full') {
                            return response($result['message'], 429)->header('Retry-After', 60);
                        }

                        $return_payloads->push([
                            'application' => $application->name,
                            'status' => $result['status'] ?? 'success',
                            'message' => $result['message'] ?? 'Preview Deployment queued',
                        ]);
                    } elseif (in_array($action, ['closed', 'close', 'merge'])) {
                        $found = ApplicationPreview::where('application_id', $application->id)
                            ->where('pull_request_id', $pull_request_id)
                            ->first();

                        if ($found) {
                            CleanupPreviewDeployment::run($application, $pull_request_id, $found);
                            $return_payloads->push([
                                'application' => $application->name,
                                'status' => 'success',
                                'message' => 'Preview deployment closed.',
                            ]);
                        }
                    }
                }
            }

            return response($return_payloads);
        } catch (Exception $e) {
            return handleError($e);
        }
    }

    public function manual(Request $request)
    {
        try {
            $return_payloads = collect([]);
            $payload = $request->collect();
            $headers = $request->headers->all();
            $x_gitlab_token = data_get($headers, 'x-gitlab-token.0');
            $x_gitlab_event = data_get($payload, 'object_kind');
            $allowed_events = ['push', 'merge_request'];
            if (! in_array($x_gitlab_event, $allowed_events)) {
                $return_payloads->push([
                    'status' => 'failed',
                    'message' => 'Event not allowed. Only push and merge_request events are allowed.',
                ]);

                return response($return_payloads);
            }

            if (empty($x_gitlab_token)) {
                auditLogWebhookFailure('gitlab', 'webhook_token_missing', [
                    'event' => $x_gitlab_event,
                ]);
                $return_payloads->push([
                    'status' => 'failed',
                    'message' => 'Invalid signature.',
                ]);

                return response($return_payloads);
            }

            if ($x_gitlab_event === 'push') {
                $branch = data_get($payload, 'ref');
                $full_name = data_get($payload, 'project.path_with_namespace');
                if (Str::isMatch('/refs\/heads\/*/', $branch)) {
                    $branch = Str::after($branch, 'refs/heads/');
                }
                if (! $branch) {
                    $return_payloads->push([
                        'status' => 'failed',
                        'message' => 'Nothing to do. No branch found in the request.',
                    ]);

                    return response($return_payloads);
                }
                $added_files = data_get($payload, 'commits.*.added');
                $removed_files = data_get($payload, 'commits.*.removed');
                $modified_files = data_get($payload, 'commits.*.modified');
                $changed_files = collect($added_files)->concat($removed_files)->concat($modified_files)->unique()->flatten();
                $skip_deploy_commits = self::shouldSkipDeploy(data_get($payload, 'commits.*.message', []));
            }
            if ($x_gitlab_event === 'merge_request') {
                $action = data_get($payload, 'object_attributes.action');
                $branch = data_get($payload, 'object_attributes.source_branch');
                $base_branch = data_get($payload, 'object_attributes.target_branch');
                $full_name = data_get($payload, 'project.path_with_namespace');
                $pull_request_id = data_get($payload, 'object_attributes.iid');
                $pull_request_html_url = data_get($payload, 'object_attributes.url');
                $pull_request_title = data_get($payload, 'object_attributes.title');
                $latest_commit_message = data_get($payload, 'object_attributes.last_commit.message');
                $skip_deploy_pr = self::shouldSkipDeployAny([$pull_request_title, $latest_commit_message]);
                if (! $branch) {
                    $return_payloads->push([
                        'status' => 'failed',
                        'message' => 'Nothing to do. No branch found in the request.',
                    ]);

                    return response($return_payloads);
                }
            }
            $full_name = $this->manualWebhookRepositoryFullName($full_name);
            if ($full_name === null) {
                $return_payloads->push([
                    'status' => 'failed',
                    'message' => 'Nothing to do. Invalid repository.',
                ]);

                return response($return_payloads);
            }
            $applications = Application::query();
            if ($x_gitlab_event === 'push') {
                $applications = $this->manualWebhookApplications($applications->where('git_branch', $branch), $full_name);
                if ($applications->isEmpty()) {
                    $return_payloads->push([
                        'status' => 'failed',
                        'message' => "Nothing to do. No applications found with deploy key set, branch is '$branch' and Git Repository name has $full_name.",
                    ]);

                    return response($return_payloads);
                }
            }
            if ($x_gitlab_event === 'merge_request') {
                $applications = $this->manualWebhookApplications($applications->where('git_branch', $base_branch), $full_name);
                if ($applications->isEmpty()) {
                    $return_payloads->push([
                        'status' => 'failed',
                        'message' => "Nothing to do. No applications found with branch '$base_branch'.",
                    ]);

                    return response($return_payloads);
                }
            }
            foreach ($applications as $application) {
                $webhook_secret = data_get($application, 'manual_webhook_secret_gitlab');
                if (empty($webhook_secret)) {
                    auditLogWebhookFailure('gitlab', 'webhook_secret_missing', [
                        'application_uuid' => $application->uuid,
                        'application_name' => $application->name,
                        'repository' => $full_name ?? null,
                        'event' => $x_gitlab_event,
                    ]);
                    $return_payloads->push($this->unauthenticatedManualWebhookFailurePayload());

                    continue;
                }
                if (! hash_equals($webhook_secret, $x_gitlab_token ?? '')) {
                    auditLogWebhookFailure('gitlab', 'invalid_signature', [
                        'application_uuid' => $application->uuid,
                        'application_name' => $application->name,
                        'repository' => $full_name ?? null,
                        'event' => $x_gitlab_event,
                    ]);
                    $return_payloads->push($this->unauthenticatedManualWebhookFailurePayload());

                    continue;
                }
                $isFunctional = $application->destination->server->isFunctional();
                if (! $isFunctional) {
                    $return_payloads->push([
                        'application' => $application->name,
                        'status' => 'failed',
                        'message' => 'Server is not functional',
                    ]);

                    continue;
                }
                if ($x_gitlab_event === 'push') {
                    if ($application->isDeployable()) {
                        $is_watch_path_triggered = $application->isWatchPathsTriggered($changed_files);
                        if ($is_watch_path_triggered || blank($application->watch_paths)) {
                            if ($skip_deploy_commits ?? false) {
                                $return_payloads->push([
                                    'application' => $application->name,
                                    'status' => 'skipped',
                                    'message' => 'All commits contain [skip cd] or [skip ci]. Skipping deployment.',
                                    'application_uuid' => $application->uuid,
                                    'application_name' => $application->name,
                                ]);

                                continue;
                            }
                            $deployment_uuid = new_public_id();
                            $result = queue_application_deployment(
                                application: $application,
                                deployment_uuid: $deployment_uuid,
                                commit: data_get($payload, 'after', 'HEAD'),
                                force_rebuild: false,
                                is_webhook: true,
                            );
                            if ($result['status'] === 'queue_full') {
                                return response($result['message'], 429)->header('Retry-After', 60);
                            } elseif ($result['status'] === 'skipped') {
                                $return_payloads->push([
                                    'status' => $result['status'],
                                    'message' => $result['message'],
                                    'application_uuid' => $application->uuid,
                                    'application_name' => $application->name,
                                ]);
                            } else {
                                auditLog('webhook.deployment.queued', [
                                    'provider' => 'gitlab',
                                    'mode' => 'manual',
                                    'application_uuid' => $application->uuid,
                                    'application_name' => $application->name,
                                    'deployment_uuid' => $deployment_uuid,
                                    'commit' => data_get($payload, 'after'),
                                    'repository' => $full_name ?? null,
                                ]);
                                $return_payloads->push([
                                    'status' => 'success',
                                    'message' => 'Deployment queued.',
                                    'application_uuid' => $application->uuid,
                                    'application_name' => $application->name,
                                ]);
                            }
                        } else {
                            $paths = str($application->watch_paths)->explode("\n");
                            $return_payloads->push([
                                'status' => 'failed',
                                'message' => 'Changed files do not match watch paths. Ignoring deployment.',
                                'application_uuid' => $application->uuid,
                                'application_name' => $application->name,
                                'details' => [
                                    'changed_files' => $changed_files,
                                    'watch_paths' => $paths,
                                ],
                            ]);
                        }
                    } else {
                        $return_payloads->push([
                            'status' => 'failed',
                            'message' => 'Deployments disabled',
                            'application_uuid' => $application->uuid,
                            'application_name' => $application->name,
                        ]);
                    }
                }
                if ($x_gitlab_event === 'merge_request') {
                    if ($action === 'open' || $action === 'opened' || $action === 'synchronize' || $action === 'reopened' || $action === 'reopen' || $action === 'update') {
                        if ($application->isPRDeployable()) {
                            if ($skip_deploy_pr ?? false) {
                                $return_payloads->push([
                                    'application' => $application->name,
                                    'status' => 'skipped',
                                    'message' => 'PR title or latest commit contains [skip cd] or [skip ci]. Skipping preview deployment.',
                                ]);

                                continue;
                            }
                            $deployment_uuid = new_public_id();
                            $found = ApplicationPreview::where('application_id', $application->id)->where('pull_request_id', $pull_request_id)->first();
                            if (! $found) {
                                if ($application->build_pack === 'dockercompose') {
                                    $pr_app = ApplicationPreview::create([
                                        'git_type' => 'gitlab',
                                        'application_id' => $application->id,
                                        'pull_request_id' => $pull_request_id,
                                        'pull_request_html_url' => $pull_request_html_url,
                                        'docker_compose_domains' => $application->docker_compose_domains,
                                    ]);
                                    $pr_app->generate_preview_fqdn_compose();
                                } else {
                                    $pr_app = ApplicationPreview::create([
                                        'git_type' => 'gitlab',
                                        'application_id' => $application->id,
                                        'pull_request_id' => $pull_request_id,
                                        'pull_request_html_url' => $pull_request_html_url,
                                    ]);
                                    $pr_app->generate_preview_fqdn();
                                }
                            }
                            $result = queue_application_deployment(
                                application: $application,
                                pull_request_id: $pull_request_id,
                                deployment_uuid: $deployment_uuid,
                                commit: data_get($payload, 'object_attributes.last_commit.id', 'HEAD'),
                                force_rebuild: false,
                                is_webhook: true,
                                git_type: 'gitlab'
                            );
                            if ($result['status'] === 'queue_full') {
                                return response($result['message'], 429)->header('Retry-After', 60);
                            } elseif ($result['status'] === 'skipped') {
                                $return_payloads->push([
                                    'application' => $application->name,
                                    'status' => 'skipped',
                                    'message' => $result['message'],
                                ]);
                            } else {
                                $return_payloads->push([
                                    'application' => $application->name,
                                    'status' => 'success',
                                    'message' => 'Preview Deployment queued',
                                ]);
                            }
                        } else {
                            $return_payloads->push([
                                'application' => $application->name,
                                'status' => 'failed',
                                'message' => 'Preview deployments disabled',
                            ]);
                        }
                    } elseif ($action === 'closed' || $action === 'close' || $action === 'merge') {
                        $found = ApplicationPreview::where('application_id', $application->id)->where('pull_request_id', $pull_request_id)->first();
                        if ($found) {
                            CleanupPreviewDeployment::run($application, $pull_request_id, $found);

                            $return_payloads->push([
                                'application' => $application->name,
                                'status' => 'success',
                                'message' => 'Preview deployment closed.',
                            ]);
                        } else {
                            $return_payloads->push([
                                'application' => $application->name,
                                'status' => 'failed',
                                'message' => 'No preview deployment found.',
                            ]);
                        }
                    } else {
                        $return_payloads->push([
                            'application' => $application->name,
                            'status' => 'failed',
                            'message' => 'No action found. Contact us for debugging.',
                        ]);
                    }
                }
            }

            return response($return_payloads);
        } catch (Exception $e) {
            return handleError($e);
        }
    }
}