<?php

namespace App\Service\wx;

use App\BaseApp\BaseWxService;
use App\Models\business\WxTemplateModel;
use App\Models\business\WxUserModel;
use App\Models\WxAppModel;
use App\Service\business\WxCardSchemeService;
use App\Service\business\WxTemplatePresetService;
use App\Service\business\WxTemplateSchemaService;

/**
 * 小程序主题下发（免授权）
 *
 * 小程序启动时拉一次并缓存本地，拿不到就用内置兜底主题——
 * 主题接口挂了不能导致小程序白屏。
 */
class WxThemeService extends BaseWxService
{
    protected bool $needLogin = false;

    /**
     * 当前生效主题
     *
     * 优先级：显式 code > 登录经销商专属 template_code > 品牌配置 template_code
     * > 该品牌默认模板 > 通用默认模板 > 内置预设
     */
    public function current(string $code = ''): array
    {
        $appCode = WxAppService::getInstance()->currentCode();
        $template = null;

        if ($code !== '') {
            $template = WxTemplateModel::where('code', $code)->where('deleted_at', 0)->where('status', 0)->first();
        }
        // 已登录经销商：可用专属模板覆盖品牌默认（未登录则 userInfo 为空，跳过）
        if (empty($template) && (int) ($this->userInfo['is_p'] ?? 0) === 1) {
            $userCode = trim((string) ($this->userInfo['template_code'] ?? ''));
            if ($userCode === '' && !empty($this->userInfo['id'])) {
                $userCode = (string) (WxUserModel::where('id', $this->userInfo['id'])
                    ->where('deleted_at', 0)
                    ->value('template_code') ?? '');
            }
            if ($userCode !== '') {
                $template = WxTemplateModel::where('code', $userCode)
                    ->where('deleted_at', 0)->where('status', 0)->first();
            }
        }
        if (empty($template) && $appCode !== '') {
            $bound = (string) (WxAppModel::where('code', $appCode)
                ->where('deleted_at', 0)
                ->value('template_code') ?? '');
            if ($bound !== '') {
                $template = WxTemplateModel::where('code', $bound)->where('deleted_at', 0)->where('status', 0)->first();
            }
        }
        if (empty($template) && $appCode !== '') {
            $template = WxTemplateModel::where('app_code', $appCode)
                ->where('is_default', 1)->where('deleted_at', 0)->where('status', 0)->first();
        }
        if (empty($template)) {
            $template = WxTemplateModel::where('app_code', '')
                ->where('is_default', 1)->where('deleted_at', 0)->where('status', 0)->first();
        }

        $schema = WxTemplateSchemaService::getInstance();
        if (empty($template)) {
            $preset = WxTemplatePresetService::getInstance()->all()[0] ?? [];
            $tokens = $preset['tokens'] ?? [];
            $layout = $preset['layout'] ?? [];
            return $this->packTheme(
                (string) ($preset['code'] ?? 'lux-champagne'),
                (string) ($preset['name'] ?? '轻奢·香槟金'),
                (string) ($preset['style_tag'] ?? '轻奢'),
                0,
                $tokens,
                $layout,
                $schema,
                true,
            );
        }

        $template = $template->toArray();
        $tokens = is_array($template['tokens']) ? $template['tokens'] : [];
        $layout = is_array($template['layout']) ? $template['layout'] : [];
        return $this->packTheme(
            (string) $template['code'],
            (string) $template['name'],
            (string) $template['style_tag'],
            (int) $template['version'],
            $tokens,
            $layout,
            $schema,
            false,
        );
    }

    /**
     * 组装主题包：令牌 + 布局 + 本模板引用到的卡片方案
     */
    private function packTheme(
        string $code,
        string $name,
        string $styleTag,
        int $version,
        array $tokens,
        array $layout,
        WxTemplateSchemaService $schema,
        bool $fallback,
    ): array {
        return [
            'code' => $code,
            'name' => $name,
            'style_tag' => $styleTag,
            'version' => $version,
            'tokens' => $tokens,
            'layout' => $layout,
            'css_vars' => $schema->toCssVariables($tokens),
            'card_schemes' => WxCardSchemeService::mapByCodes($this->collectSchemeCodes($layout)),
            'features' => [
                'package_enabled' => WxAppService::getInstance()->packageEnabled(),
                'subscribe_pay_tpl' => $this->subscribeTpl('subscribe_pay_tpl'),
                'subscribe_ship_tpl' => $this->subscribeTpl('subscribe_ship_tpl'),
            ],
            'fallback' => $fallback,
        ];
    }

    /**
     * 从根 card_scheme、页级 pages.*.card_scheme、区块 props.card_scheme 收集引用
     *
     * @return array<int, string>
     */
    private function collectSchemeCodes(array $layout): array
    {
        $codes = [];
        if (!empty($layout['card_scheme'])) {
            $codes[] = (string) $layout['card_scheme'];
        }
        foreach ((array) ($layout['pages'] ?? []) as $page) {
            $pageScheme = (string) ($page['card_scheme'] ?? '');
            if ($pageScheme !== '') {
                $codes[] = $pageScheme;
            }
            foreach ((array) ($page['sections'] ?? []) as $section) {
                $code = (string) ($section['props']['card_scheme'] ?? '');
                if ($code !== '') {
                    $codes[] = $code;
                }
            }
        }
        return $codes;
    }

    /**
     * 可选风格列表，用于小程序里让用户自己换肤
     */
    public function gallery(): mixed
    {
        $appCode = WxAppService::getInstance()->currentCode();
        return WxTemplateModel::where('deleted_at', 0)
            ->where('status', 0)
            ->when($appCode !== '', fn ($query) => $query->whereIn('app_code', ['', $appCode]))
            ->orderBy('sort', 'asc')
            ->get(['code', 'name', 'style_tag', 'preview']);
    }

    /**
     * 当前品牌的订阅模板 ID，给小程序 requestSubscribeMessage 用
     */
    private function subscribeTpl(string $field): string
    {
        try {
            $app = WxAppService::getInstance()->current();
            return trim((string) ($app[$field] ?? ''));
        } catch (\Throwable) {
            return '';
        }
    }
}