<?php

namespace App\Controllers\Share;

use App\Controllers\BaseController;
use App\Libraries\AuditLogger;
use App\Models\ChartModel;
use App\Models\DashboardModel;
use App\Models\SharedLinkModel;

/**
 * Authenticated: create / revoke share links.
 */
class LinkController extends BaseController
{
    public function generate()
    {
        $workspaceId = (int) $this->session->get('active_workspace_id');
        $userId = (int) $this->session->get('user_id');

        $rules = [
            'type'         => 'required|in_list[dashboard,chart]',
            'resource_id'  => 'required|integer',
            'password'     => 'permit_empty|max_length[200]',
            'expires_at'   => 'permit_empty|max_length[40]',
        ];

        if (! $this->validate($rules)) {
            if ($this->request->isAJAX()) {
                return $this->response->setJSON(['success' => false, 'errors' => $this->validator->getErrors()])->setStatusCode(422);
            }

            return redirect()->back()->with('errors', $this->validator->getErrors());
        }

        $type = (string) $this->request->getPost('type');
        $resourceId = (int) $this->request->getPost('resource_id');

        if ($type === 'dashboard') {
            $d = (new DashboardModel())->findForWorkspace($resourceId, $workspaceId);
            if (! $d) {
                return $this->ajaxOrRedirect(false, 'Dashboard not found.');
            }
        } else {
            $c = (new ChartModel())->where('workspace_id', $workspaceId)->find($resourceId);
            if (! $c) {
                return $this->ajaxOrRedirect(false, 'Chart not found.');
            }
        }

        $pwd = trim((string) $this->request->getPost('password'));
        $hash = $pwd !== '' ? password_hash($pwd, PASSWORD_DEFAULT) : null;

        $expRaw = trim((string) $this->request->getPost('expires_at'));
        $expiresAt = null;
        if ($expRaw !== '') {
            $ts = strtotime($expRaw);
            if ($ts === false) {
                return $this->ajaxOrRedirect(false, 'Invalid expiry date.');
            }
            $expiresAt = date('Y-m-d H:i:s', $ts);
        }

        $model = new SharedLinkModel();
        $token = SharedLinkModel::generateToken();

        $id = (int) $model->insert([
            'token'         => $token,
            'type'          => $type,
            'resource_id'   => $resourceId,
            'workspace_id'  => $workspaceId,
            'password_hash' => $hash,
            'expires_at'    => $expiresAt,
            'view_count'    => 0,
            'is_active'     => 1,
            'created_by'    => $userId,
        ], true);

        $publicUrl = rtrim(base_url(), '/') . '/share/' . $token;

        AuditLogger::log(
            'share.created',
            'shared_link',
            $id,
            null,
            [
                'type'         => $type,
                'resource_id'  => $resourceId,
                'has_password' => $hash !== null,
                'expires_at'   => $expiresAt,
            ],
            $workspaceId,
            $userId
        );

        if ($this->request->isAJAX()) {
            return $this->response->setJSON([
                'success'    => true,
                'id'         => $id,
                'token'      => $token,
                'url'        => $publicUrl,
                'view_count' => 0,
                'csrf'       => ['name' => csrf_token(), 'hash' => csrf_hash()],
            ]);
        }

        return redirect()->back()->with('success', 'Share link created: ' . $publicUrl);
    }

    public function revoke(int $id)
    {
        $workspaceId = (int) $this->session->get('active_workspace_id');
        $model = new SharedLinkModel();
        $row = $model->findOwned($id, $workspaceId);
        if (! $row) {
            return $this->ajaxOrRedirect(false, 'Link not found.');
        }

        AuditLogger::log(
            'share.revoked',
            'shared_link',
            $id,
            ['is_active' => 1],
            ['is_active' => 0],
            $workspaceId,
            (int) $this->session->get('user_id')
        );

        $model->update($id, ['is_active' => 0]);

        if ($this->request->isAJAX()) {
            return $this->response->setJSON([
                'success' => true,
                'csrf'    => ['name' => csrf_token(), 'hash' => csrf_hash()],
            ]);
        }

        return redirect()->back()->with('success', 'Share link revoked.');
    }

    /**
     * Existing links for a resource (AJAX).
     */
    public function listResource()
    {
        $workspaceId = (int) $this->session->get('active_workspace_id');
        $type = (string) $this->request->getGet('type');
        $resourceId = (int) $this->request->getGet('resource_id');
        if (! in_array($type, ['dashboard', 'chart'], true) || $resourceId <= 0) {
            return $this->response->setJSON(['success' => false, 'message' => 'Invalid parameters.'])->setStatusCode(422);
        }

        if ($type === 'dashboard') {
            if (! (new DashboardModel())->findForWorkspace($resourceId, $workspaceId)) {
                return $this->response->setJSON(['success' => false])->setStatusCode(404);
            }
        } elseif (! (new ChartModel())->where('workspace_id', $workspaceId)->find($resourceId)) {
            return $this->response->setJSON(['success' => false])->setStatusCode(404);
        }

        $rows = (new SharedLinkModel())->forResource($type, $resourceId, $workspaceId);
        $out = [];
        foreach ($rows as $r) {
            $out[] = [
                'id'         => (int) $r['id'],
                'url'        => rtrim(base_url(), '/') . '/share/' . $r['token'],
                'view_count' => (int) ($r['view_count'] ?? 0),
                'expires_at' => $r['expires_at'],
                'has_password' => ! empty($r['password_hash']),
            ];
        }

        return $this->response->setJSON(['success' => true, 'links' => $out]);
    }

    private function ajaxOrRedirect(bool $ok, string $message)
    {
        if ($this->request->isAJAX()) {
            return $this->response->setJSON(['success' => $ok, 'message' => $message])->setStatusCode($ok ? 200 : 404);
        }

        return redirect()->back()->with($ok ? 'success' : 'error', $message);
    }
}