<?php

namespace app\common\tools\ai;

use app\common\tools\ai\provider\OpenAiCompatibleAdapter;

/**
 * AI 渠道管理器.
 *
 * 管理多个AI供应商的配置、连接和调用.
 */
class AiChannelManager
{
    /**
     * @var array 已注册的供应商适配器实例
     */
    protected $providers = [];

    /**
     * 获取默认供应商的适配器实例.
     *
     * @return AiProviderInterface|null
     */
    public function getDefaultProvider(): ?AiProviderInterface
    {
        $defaultId = get_system_config('ai_default_provider', '');

        if (empty($defaultId)) {
            return null;
        }

        return $this->getProvider($defaultId);
    }

    /**
     * 获取指定供应商的适配器实例.
     *
     * @param string $providerId 供应商标识
     *
     * @return AiProviderInterface|null
     */
    public function getProvider(string $providerId): ?AiProviderInterface
    {
        if (isset($this->providers[$providerId])) {
            return $this->providers[$providerId];
        }

        $apiKey = get_system_config("ai_provider_{$providerId}_key", '');
        if (empty($apiKey)) {
            return null;
        }

        $provider = new OpenAiCompatibleAdapter($providerId);
        $this->providers[$providerId] = $provider;

        return $provider;
    }

    /**
     * 获取所有已配置(有API Key)的供应商列表.
     *
     * @return array
     */
    public function getAvailableProviders(): array
    {
        $sync = new ModelsDevSync();
        $allProviders = $sync->getProviders();

        $available = [];
        foreach ($allProviders as $id => $provider) {
            $apiKey = get_system_config("ai_provider_{$id}_key", '');
            if (!empty($apiKey)) {
                $provider['configured'] = true;
                $provider['base_url'] = get_system_config("ai_provider_{$id}_base_url", $provider['api_base_url'] ?? '');
                $available[$id] = $provider;
            }
        }

        // 检查不在models.dev中但已手动配置的供应商
        $allConfig = get_system_config();
        if (is_array($allConfig)) {
            foreach ($allConfig as $key => $value) {
                if (preg_match('/^ai_provider_([a-z0-9_]+)_key$/', $key, $matches)) {
                    $customId = $matches[1];
                    if (!empty($value) && !isset($available[$customId])) {
                        $available[$customId] = [
                            'id' => $customId,
                            'name' => ucfirst(str_replace('_', ' ', $customId)),
                            'configured' => true,
                            'base_url' => get_system_config("ai_provider_{$customId}_base_url", ''),
                        ];
                    }
                }
            }
        }

        return $available;
    }

    /**
     * 保存供应商配置.
     *
     * @param array $data 配置数据,格式:
     *                    [
     *                      'provider_id' => 'zhipu',
     *                      'key' => 'api_key_value',
     *                      'base_url' => 'https://open.bigmodel.cn/api/paas/v4',
     *                    ]
     *
     * @return bool
     */
    public function saveChannelConfig(array $data): bool
    {
        $providerId = $data['provider_id'] ?? '';
        if (empty($providerId)) {
            return false;
        }

        $configs = [
            "ai_provider_{$providerId}_key" => $data['key'] ?? '',
            "ai_provider_{$providerId}_base_url" => $data['base_url'] ?? '',
        ];

        if (isset($data['is_default']) && $data['is_default']) {
            $configs['ai_default_provider'] = $providerId;
        }

        if (isset($data['default_model'])) {
            $configs['ai_default_model'] = $data['default_model'];
        }

        return $this->saveConfigs($configs);
    }

    /**
     * 删除供应商配置.
     *
     * @param string $providerId 供应商标识
     *
     * @return bool
     */
    public function deleteChannelConfig(string $providerId): bool
    {
        $configs = [
            "ai_provider_{$providerId}_key" => '',
            "ai_provider_{$providerId}_base_url" => '',
        ];

        // 如果删除的是默认供应商,清除默认设置
        $defaultProvider = get_system_config('ai_default_provider', '');
        if ($defaultProvider === $providerId) {
            $configs['ai_default_provider'] = '';
        }

        return $this->saveConfigs($configs);
    }

    /**
     * 批量保存配置到SystemConfig.
     *
     * @param array $configs 键值对配置
     *
     * @return bool
     */
    protected function saveConfigs(array $configs): bool
    {
        $list = \app\model\SystemConfig::column('value', 'name');

        foreach ($configs as $key => $value) {
            if (isset($list[$key])) {
                \app\model\SystemConfig::where('name', $key)->update(['value' => $value]);
            } else {
                $model = new \app\model\SystemConfig();
                $model->name = $key;
                $model->value = $value;
                $model->save();
            }

            $list[$key] = $value;
        }

        \think\facade\Cache::set('system_config', $list);

        return true;
    }
}