<?php

namespace App\Http\Controllers\Api;

use Illuminate\Http\JsonResponse;
use Symfony\Component\HttpFoundation\Response;

class UiController extends BaseApiController
{
    protected string $defaultUserTimezone = 'America/New_York';

    protected function styleConfig(): array
    {
        $styleCfg = config('Style');
        if (is_object($styleCfg)) {
            return [
                'stylePalettes' => $styleCfg->stylePalettes ?? [],
                'menuPalettes'  => $styleCfg->menuPalettes ?? [],
            ];
        }
        return [
            'stylePalettes' => $styleCfg['stylePalettes'] ?? [],
            'menuPalettes'  => $styleCfg['menuPalettes'] ?? [],
        ];
    }

    /**
     * GET /api/v1/ui/style
     * Get current UI style preferences
     */
    public function getStyle()
    {
        $user = $this->getCurrentUser();
        if (!$user) {
            return $this->respondError('Authentication required', Response::HTTP_UNAUTHORIZED);
        }

        try {
            $session = session();
            $cfg = $this->styleConfig();

            return $this->success([
                'style_color'      => $session->get('style_color'),
                'menu_color'       => $session->get('menu_color'),
                'menu_custom_bg'   => $session->get('menu_custom_bg'),
                'menu_custom_text' => $session->get('menu_custom_text'),
                'menu_custom_mode' => $session->get('menu_custom_mode'),
                'available_palettes' => $cfg['stylePalettes'] ?? [],
                'available_menus'    => $cfg['menuPalettes'] ?? [],
            ], 'UI style preferences retrieved successfully');
        } catch (\Throwable $e) {
            log_message('error', 'UI style error: ' . $e->getMessage());
            return $this->respondError('Failed to retrieve UI style', Response::HTTP_INTERNAL_SERVER_ERROR);
        }
    }

    /**
     * POST /api/v1/ui/style
     * Update UI style preferences via POST body
     */
    public function updateStyle()
    {
        $user = $this->getCurrentUser();
        if (!$user) {
            return $this->respondError('Authentication required', Response::HTTP_UNAUTHORIZED);
        }

        $data = $this->payloadData();
        if (empty($data)) {
            return $this->respondError('Invalid request data', Response::HTTP_BAD_REQUEST);
        }

        return $this->processStyleUpdate($data);
    }

    /**
     * GET /api/v1/ui/style (with query parameters)
     * Update UI style preferences via GET parameters (for backward compatibility)
     */
    public function style()
    {
        $user = $this->getCurrentUser();
        if (!$user) {
            return $this->respondError('Authentication required', Response::HTTP_UNAUTHORIZED);
        }

        // Get parameters from query string
        $accent = (string) $this->request->getGet('accent');
        $menu = (string) $this->request->getGet('menu');
        $menuBg = (string) $this->request->getGet('menu_bg');
        $menuTx = (string) $this->request->getGet('menu_text');
        $menuMd = (string) $this->request->getGet('menu_mode');

        $data = [];
        if ($accent !== '') {
            $data['accent'] = $accent;
        }
        if ($menu !== '') {
            $data['menu'] = $menu;
        }
        if ($menuBg !== '') {
            $data['menu_bg'] = $menuBg;
        }
        if ($menuTx !== '') {
            $data['menu_text'] = $menuTx;
        }
        if ($menuMd !== '') {
            $data['menu_mode'] = $menuMd;
        }

        if (empty($data)) {
            // No parameters provided, return current style
            return $this->getStyle();
        }

        return $this->processStyleUpdate($data);
    }

    /**
     * Process style update from either GET or POST
     */
    private function processStyleUpdate(array $data): JsonResponse
    {
        try {
            $session = session();
            $cfg = $this->styleConfig();

            if (isset($data['accent']) && $data['accent'] !== '' && isset(($cfg['stylePalettes'] ?? [])[$data['accent']])) {
                $session->put('style_color', $data['accent']);
            }

            if (isset($data['menu']) && $data['menu'] !== '') {
                if (isset(($cfg['menuPalettes'] ?? [])[$data['menu']])) {
                    $session->put('menu_color', $data['menu']);
                } elseif (strtolower($data['menu']) === 'custom' || (isset($data['menu_bg']) && $data['menu_bg'] !== '') || (isset($data['menu_text']) && $data['menu_text'] !== '')) {
                    // Allow custom menu colors
                    $bg = $this->normalizeHex($data['menu_bg'] ?? '');
                    $tx = $this->normalizeHex($data['menu_text'] ?? '');

                    if ($bg === '' && $tx === '') {
                        // no valid values; ignore
                    } else {
                        if ($bg === '') {
                            $bg = '#0f172a';
                        }
                        if ($tx === '') {
                            $tx = '#ffffff';
                        }

                        // Determine mode if requested auto or missing
                        $mode = isset($data['menu_mode']) && in_array($data['menu_mode'], ['light', 'dark'], true)
                            ? $data['menu_mode']
                            : $this->autoModeForBg($bg);

                        $session->put('menu_color', 'custom');
                        $session->put('menu_custom_bg', $bg);
                        $session->put('menu_custom_text', $tx);
                        $session->put('menu_custom_mode', $mode);
                    }
                }
            }

            return $this->success([
                'style_color'      => $session->get('style_color'),
                'menu_color'       => $session->get('menu_color'),
                'menu_custom_bg'   => $session->get('menu_custom_bg'),
                'menu_custom_text' => $session->get('menu_custom_text'),
                'menu_custom_mode' => $session->get('menu_custom_mode'),
            ], 'UI style updated successfully');
        } catch (\Throwable $e) {
            log_message('error', 'UI style update error: ' . $e->getMessage());
            return $this->respondError('Failed to update UI style', Response::HTTP_INTERNAL_SERVER_ERROR);
        }
    }

    private function normalizeHex(string $hex): string
    {
        $h = trim($hex);
        if ($h === '') {
            return '';
        }
        if ($h[0] !== '#') {
            $h = '#' . $h;
        }
        if (preg_match('/^#([0-9a-fA-F]{3})$/', $h, $m)) {
            $r = $m[1][0];
            $g = $m[1][1];
            $b = $m[1][2];
            return '#' . $r . $r . $g . $g . $b . $b;
        }
        if (preg_match('/^#([0-9a-fA-F]{6})$/', $h)) {
            return strtoupper($h);
        }
        return '';
    }

    private function autoModeForBg(string $hexBg): string
    {
        $hex = ltrim($hexBg, '#');
        if (strlen($hex) !== 6) {
            return 'dark';
        }

        $r = hexdec(substr($hex, 0, 2));
        $g = hexdec(substr($hex, 2, 2));
        $b = hexdec(substr($hex, 4, 2));

        $lum = (0.2126 * $r + 0.7152 * $g + 0.0722 * $b) / 255;
        return $lum < 0.5 ? 'dark' : 'light';
    }
}