#include "wifi_manager.h"

// 外部变量和函数声明
extern bool deviceConnected;
void sendJSONDataToBLE(const String& jsonData);
void setNetworkStatus(NetworkStatus status);

/**
 * @brief WiFi管理器构造函数
 * 初始化WiFi管理器的成员变量
 */
WiFiManager::WiFiManager() {
    savedNetworkCount = 0;
    currentState = WIFI_IDLE;
    lastReconnectAttempt = 0;
    isScanning = false;
}

/**
 * @brief 初始化WiFi管理器
 * 开启Preferences存储，并加载保存的WiFi配置
 */
void WiFiManager::begin() {
    preferences.begin("wifi_manager", false);
    loadWiFiConfigs();
}

/**
 * @brief 加载保存的WiFi配置
 * 从Flash中读取之前保存的WiFi网络配置
 * @return 是否成功加载到配置
 */
bool WiFiManager::loadWiFiConfigs() {
    savedNetworkCount = 0;
    
    for (int i = 0; i < MAX_WIFI_NETWORKS; i++) {
        String key = "wifi_" + String(i);
        String configStr = preferences.getString(key.c_str(), "");
        
        if (configStr.length() > 0) {
            JsonDocument doc;
            DeserializationError error = deserializeJson(doc, configStr);
            
            if (!error) {
                const char* ssid = doc["ssid"];
                const char* password = doc["password"];
                
                if (ssid && password) {
                    strncpy(savedNetworks[savedNetworkCount].ssid, ssid, 31);
                    savedNetworks[savedNetworkCount].ssid[31] = '\0';
                    strncpy(savedNetworks[savedNetworkCount].password, password, 63);
                    savedNetworks[savedNetworkCount].password[63] = '\0';
                    savedNetworkCount++;
                    
                    Serial.printf("📶 加载WiFi配置 %d: %s\n", savedNetworkCount, ssid);
                }
            }
        }
    }
    
    Serial.printf("✅ 共加载 %d 个WiFi配置\n", savedNetworkCount);
    return savedNetworkCount > 0;
}

/**
 * @brief 保存WiFi配置
 * 将WiFi网络配置保存到Flash中
 * @param ssid WiFi网络名称
 * @param password WiFi网络密码
 * @return 是否保存成功
 */
bool WiFiManager::saveWiFiConfig(const char* ssid, const char* password) {
    // 检查是否已存在该网络配置
    for (int i = 0; i < savedNetworkCount; i++) {
        if (strcmp(savedNetworks[i].ssid, ssid) == 0) {
            // 更新现有配置
            strncpy(savedNetworks[i].password, password, 63);
            savedNetworks[i].password[63] = '\0';
            
            JsonDocument doc;
            doc["ssid"] = ssid;
            doc["password"] = password;
            String configStr;
            serializeJson(doc, configStr);
            
            String key = "wifi_" + String(i);
            preferences.putString(key.c_str(), configStr);
            
            Serial.printf("🔄 更新WiFi配置: %s\n", ssid);
            return true;
        }
    }
    
    // 添加新配置
    if (savedNetworkCount < MAX_WIFI_NETWORKS) {
        strncpy(savedNetworks[savedNetworkCount].ssid, ssid, 31);
        savedNetworks[savedNetworkCount].ssid[31] = '\0';
        strncpy(savedNetworks[savedNetworkCount].password, password, 63);
        savedNetworks[savedNetworkCount].password[63] = '\0';
        
        JsonDocument doc;
        doc["ssid"] = ssid;
        doc["password"] = password;
        String configStr;
        serializeJson(doc, configStr);
        
        String key = "wifi_" + String(savedNetworkCount);
        preferences.putString(key.c_str(), configStr);
        savedNetworkCount++;
        
        Serial.printf("➕ 新增WiFi配置: %s (总计: %d)\n", ssid, savedNetworkCount);
        return true;
    }
    
    Serial.println("❌ WiFi配置已满，无法添加");
    return false;
}

/**
 * @brief 连接到指定WiFi网络
 * 尝试连接到给定的WiFi网络
 * @param ssid WiFi网络名称
 * @param password WiFi网络密码
 * @return 是否连接成功
 */
bool WiFiManager::connectToNetwork(const char* ssid, const char* password) {
    Serial.printf("🌐 [WiFi] 尝试连接到 SSID: %s\n", ssid);
    
    currentState = WIFI_CONNECTING;
    setNetworkStatus(NET_CONNECTING);
    
    WiFi.mode(WIFI_STA);
    vTaskDelay(200 / portTICK_PERIOD_MS);
    WiFi.begin(ssid, password);
    
    unsigned long startTime = millis();
    unsigned long lastStatusPrint = 0;
    
    while (WiFi.status() != WL_CONNECTED && (millis() - startTime) < WIFI_CONNECT_TIMEOUT) {
        if (millis() - lastStatusPrint >= 500) {
            Serial.printf("[WiFi] 连接中，状态: %d\n", WiFi.status());
            lastStatusPrint = millis();
        }
        yield();
        vTaskDelay(50 / portTICK_PERIOD_MS);
    }
    
    if (WiFi.status() == WL_CONNECTED) {
        Serial.println("✅ [WiFi] 连接成功！");
        Serial.printf("🌐 IP地址: %s\n", WiFi.localIP().toString().c_str());
        Serial.printf("🔒 信号强度: %d dBm\n", WiFi.RSSI());
        
        currentState = WIFI_CONNECTED;
        setNetworkStatus(NET_CONNECTED);
        
        return true;
    } else {
        Serial.println("❌ [WiFi] 连接超时");
        currentState = WIFI_DISCONNECTED;
        setNetworkStatus(NET_DISCONNECTED);
        return false;
    }
}

/**
 * @brief 扫描并匹配WiFi网络
 * 扫描附近的WiFi网络，并尝试匹配已保存的配置
 * 如果找到多个匹配的网络，优先连接信号强度最强的那一组
 * @return 是否成功连接到匹配的网络
 */
bool WiFiManager::scanAndMatchNetworks() {
    if (isScanning) {
        Serial.println("⚠️ [WiFi] 正在扫描中，跳过本次扫描");
        return false;
    }
    
    Serial.println("🔍 [WiFi] 开始扫描WiFi网络...");
    currentState = WIFI_SCANNING;
    isScanning = true;
    
    if (WiFi.status() == WL_CONNECTED) {
        Serial.println("📶 WiFi已连接，断开后扫描");
        WiFi.disconnect(false);
        vTaskDelay(200 / portTICK_PERIOD_MS);
    }
    
    WiFi.mode(WIFI_STA);
    vTaskDelay(200 / portTICK_PERIOD_MS);
    
    int n = WiFi.scanNetworks();
    Serial.printf("🔍 扫描到 %d 个WiFi网络\n", n);
    
    if (n <= 0) {
        Serial.println("❌ 未扫描到任何WiFi网络或扫描失败");
        currentState = WIFI_DISCONNECTED;
        isScanning = false;
        return false;
    }
    
    // 收集所有匹配的、信号强度符合要求的网络
    struct {
        const char* ssid;
        const char* password;
        int rssi;
    } bestNetwork = {nullptr, nullptr, -1000}; // 初始化为非常弱的信号
    
    // 遍历已保存的网络，寻找匹配的网络
    for (int i = 0; i < savedNetworkCount; i++) {
        for (int j = 0; j < n; j++) {
            if (WiFi.SSID(j) == String(savedNetworks[i].ssid)) {
                int rssi = WiFi.RSSI(j);
                Serial.printf("📶 找到匹配网络: %s, 信号: %d dBm\n", 
                            savedNetworks[i].ssid, rssi);
                
                // 检查信号强度是否符合要求
                if (rssi >= MIN_RSSI_THRESHOLD) {
                    // 检查是否是当前找到的信号最强的网络
                    if (rssi > bestNetwork.rssi) {
                        bestNetwork.ssid = savedNetworks[i].ssid;
                        bestNetwork.password = savedNetworks[i].password;
                        bestNetwork.rssi = rssi;
                        Serial.printf("📈 更新最佳网络: %s, 信号: %d dBm\n", 
                                    bestNetwork.ssid, bestNetwork.rssi);
                    }
                } else {
                    Serial.printf("⚠️ 信号强度过低，跳过\n");
                }
            }
        }
    }
    
    // 如果找到最佳网络，尝试连接
    if (bestNetwork.ssid != nullptr) {
        Serial.printf("✅ 选择信号最强的网络: %s, 信号: %d dBm\n", 
                    bestNetwork.ssid, bestNetwork.rssi);
        
        WiFi.scanDelete();
        vTaskDelay(300 / portTICK_PERIOD_MS);
        
        if (connectToNetwork(bestNetwork.ssid, bestNetwork.password)) {
            isScanning = false;
            return true;
        }
    }
    
    Serial.println("❌ 未找到匹配的WiFi网络或信号过弱");
    currentState = WIFI_DISCONNECTED;
    isScanning = false;
    return false;
}

/**
 * @brief 初始化WiFi连接
 * 启动WiFi初始化过程，尝试连接到已保存的网络
 * @return 是否初始化成功
 */
bool WiFiManager::initializeWiFi() {
    Serial.println("🚀 [WiFi] 初始化WiFi连接...");
    
    if (savedNetworkCount == 0) {
        Serial.println("⚠️ 未保存的WiFi配置");
        currentState = WIFI_IDLE;
        return false;
    }
    
    if (scanAndMatchNetworks()) {
        Serial.println("✅ WiFi初始化成功");
        return true;
    } else {
        Serial.println("❌ WiFi初始化失败");
        currentState = WIFI_DISCONNECTED;
        return false;
    }
}

/**
 * @brief 扫描WiFi网络并发送结果
 * 扫描附近的WiFi网络，过滤信号弱的网络，将结果通过BLE发送给客户端
 */
void WiFiManager::scanAndSendResults() {
    if (isScanning) {
        Serial.println("⚠️ [WiFi] 正在扫描中，跳过本次扫描");
        if (deviceConnected) {
            String errorMsg = String("{\"type\":\"scanWiFiResult\",\"success\":false,\"message\":\"正在扫描中，请稍后再试\",\"networks\":[],\"count\":0}");
            sendJSONDataToBLE(errorMsg);
        }
        return;
    }
    
    Serial.println("📱 [BLE-WiFi] 开始WiFi扫描...");
    isScanning = true;
    
    if (WiFi.status() == WL_CONNECTED) {
        Serial.println("📶 WiFi已连接，断开后扫描");
        WiFi.disconnect(false);
        vTaskDelay(200 / portTICK_PERIOD_MS);
    }
    
    WiFi.mode(WIFI_STA);
    vTaskDelay(200 / portTICK_PERIOD_MS);
    
    int n = WiFi.scanNetworks();
    Serial.printf("🔍 扫描到 %d 个WiFi网络\n", n);
    
    if (n <= 0) {
        Serial.println("❌ 未扫描到任何WiFi网络或扫描失败");
        isScanning = false;
        if (deviceConnected) {
            String errorMsg = String("{\"type\":\"scanWiFiResult\",\"success\":false,\"message\":\"未扫描到任何WiFi网络或扫描失败\",\"networks\":[],\"count\":0}");
            sendJSONDataToBLE(errorMsg);
        }
        return;
    }
    
    // 构建WiFi网络列表的JSON数据
    String wifiList = String("{\"type\":\"scanWiFiResult\",\"success\":true,\"count\":") + String(n) + String(",\"networks\":[");
    
    bool first = true;
    for (int i = 0; i < n; ++i) {
        if (WiFi.RSSI(i) >= MIN_RSSI_THRESHOLD) {
            if (!first) {
                wifiList += ",";
            }
            wifiList += String("{\"ssid\":\"") + WiFi.SSID(i) + String("\",\"rssi\":") + 
                         String(WiFi.RSSI(i)) + String(",\"channel\":") + 
                         String(WiFi.channel(i)) + String(",\"encryption\":");
            
            // 根据加密类型添加相应的描述
            switch (WiFi.encryptionType(i)) {
                case WIFI_AUTH_OPEN:
                    wifiList += String("\"open\"");
                    break;
                case WIFI_AUTH_WEP:
                    wifiList += String("\"WEP\"");
                    break;
                case WIFI_AUTH_WPA_PSK:
                    wifiList += String("\"WPA\"");
                    break;
                case WIFI_AUTH_WPA2_PSK:
                    wifiList += String("\"WPA2\"");
                    break;
                case WIFI_AUTH_WPA_WPA2_PSK:
                    wifiList += String("\"WPA/WPA2\"");
                    break;
                case WIFI_AUTH_WPA2_ENTERPRISE:
                    wifiList += String("\"WPA2-EAP\"");
                    break;
                case WIFI_AUTH_WPA3_PSK:
                    wifiList += String("\"WPA3\"");
                    break;
                case WIFI_AUTH_WPA2_WPA3_PSK:
                    wifiList += String("\"WPA2/WPA3\"");
                    break;
                default:
                    wifiList += String("\"unknown\"");
                    break;
            }
            wifiList += "}";
            first = false;
        }
    }
    
    wifiList += "]}";
    
    Serial.printf("✅ 发送WiFi扫描结果，包含 %d 个可用网络\n", first ? 0 : n);
    
    WiFi.scanDelete();
    isScanning = false;
    
    if (deviceConnected) {
        sendJSONDataToBLE(wifiList);
    }
}

/**
 * @brief 开始配网模式
 * 进入配网模式，扫描WiFi网络并发送结果给客户端
 * @return 是否成功进入配网模式
 */
bool WiFiManager::startConfiguration() {
    Serial.println("⚙️ [WiFi] 开始配网模式...");
    currentState = WIFI_CONFIGURING;
    scanAndSendResults();
    return true;
}

/**
 * @brief 处理配网数据
 * 处理从客户端收到的WiFi配网信息，先扫描WiFi是否有匹配的网络，再尝试连接并保存
 * @param ssid WiFi网络名称
 * @param password WiFi网络密码
 * @return 是否配置成功
 */
bool WiFiManager::handleConfigurationData(const char* ssid, const char* password) {
    Serial.printf("📱 [BLE-WiFi] 收到配网信息: SSID='%s'\n", ssid);
    
    if (ssid == nullptr || password == nullptr || strlen(ssid) == 0) {
        Serial.println("❌ 配网参数无效");
        return false;
    }
    
    // 先扫描WiFi网络，检查是否存在匹配的网络
    Serial.println("🔍 [WiFi] 扫描WiFi网络，检查是否存在匹配的网络...");
    int n = WiFi.scanNetworks();
    Serial.printf("🔍 扫描到 %d 个WiFi网络\n", n);
    
    if (n == 0) {
        Serial.println("❌ 未扫描到任何WiFi网络");
        
        if (deviceConnected) {
            String resultMsg = String("{\"type\":\"wifiConfigResult\",\"success\":false,\"message\":\"未扫描到任何WiFi网络，请检查设备位置\"}");
            sendJSONDataToBLE(resultMsg);
        }
        return false;
    }
    
    bool networkFound = false;
    bool signalTooWeak = false;
    int foundRssi = 0;
    
    for (int i = 0; i < n; i++) {
        if (WiFi.SSID(i) == String(ssid)) {
            foundRssi = WiFi.RSSI(i);
            Serial.printf("📶 找到匹配网络: %s, 信号: %d dBm\n", ssid, foundRssi);
            
            if (foundRssi >= MIN_RSSI_THRESHOLD) {
                Serial.printf("✅ 信号强度符合要求，准备连接...\n");
                networkFound = true;
                break;
            } else {
                Serial.printf("⚠️ 信号强度过低，跳过\n");
                signalTooWeak = true;
            }
        }
    }
    
    if (!networkFound) {
        String errorMsg;
        
        if (signalTooWeak) {
            errorMsg = String("{\"type\":\"wifiConfigResult\",\"success\":false,\"message\":\"目标WiFi信号过弱，请将设备靠近路由器\"}");
            Serial.printf("❌ 目标WiFi信号过弱: %d dBm (阈值: %d dBm)\n", foundRssi, MIN_RSSI_THRESHOLD);
        } else {
            errorMsg = String("{\"type\":\"wifiConfigResult\",\"success\":false,\"message\":\"未找到目标WiFi网络，请检查WiFi名称是否正确\"}");
            Serial.println("❌ 未找到目标WiFi网络");
        }
        
        if (deviceConnected) {
            sendJSONDataToBLE(errorMsg);
        }
        return false;
    }
    
    // 尝试连接到指定网络
    if (connectToNetwork(ssid, password)) {
        // 连接成功后保存配置
        if (saveWiFiConfig(ssid, password)) {
            Serial.println("✅ WiFi配置成功并已保存");
            
            if (deviceConnected) {
                String resultMsg = String("{\"type\":\"wifiConfigResult\",\"success\":true,\"message\":\"WiFi配置成功\"}");
                sendJSONDataToBLE(resultMsg);
            }
            return true;
        }
    }
    
    Serial.println("❌ WiFi配置失败");
    
    if (deviceConnected) {
        String resultMsg = String("{\"type\":\"wifiConfigResult\",\"success\":false,\"message\":\"WiFi配置失败，请检查密码是否正确\"}");
        sendJSONDataToBLE(resultMsg);
    }
    return false;
}

/**
 * @brief 处理WiFi重连
 * 检查WiFi连接状态，当断开连接时尝试重连
 */
void WiFiManager::handleReconnect() {
    // 检查当前是否已连接
    if (currentState == WIFI_CONNECTED) {
        if (WiFi.status() == WL_CONNECTED) {
            return;
        }
        // 连接已断开
        currentState = WIFI_DISCONNECTED;
        setNetworkStatus(NET_DISCONNECTED);
        Serial.println("⚠️ WiFi连接断开");
    }
    
    // 处理重连逻辑
    if (currentState == WIFI_DISCONNECTED) {
        unsigned long currentTime = millis();
        
        // 按照设定的间隔尝试重连
        if (currentTime - lastReconnectAttempt >= WIFI_RECONNECT_INTERVAL) {
            lastReconnectAttempt = currentTime;
            
            if (scanAndMatchNetworks()) {
                Serial.println("✅ WiFi重连成功");
            } else {
                Serial.println("❌ WiFi重连失败，2秒后重试");
            }
        }
    }
}

/**
 * @brief 获取当前WiFi状态
 * @return 当前的WiFi管理器状态
 */
WiFiManagerState WiFiManager::getState() {
    return currentState;
}

/**
 * @brief 检查WiFi是否已连接
 * @return WiFi是否已成功连接
 */
bool WiFiManager::isConnected() {
    return currentState == WIFI_CONNECTED && WiFi.status() == WL_CONNECTED;
}

/**
 * @brief 断开WiFi连接
 * 主动断开当前的WiFi连接
 */
void WiFiManager::disconnect() {
    WiFi.disconnect(true);
    currentState = WIFI_DISCONNECTED;
    setNetworkStatus(NET_DISCONNECTED);
}

/**
 * @brief 添加WiFi配置
 * 向保存的配置中添加新的WiFi网络
 * @param ssid WiFi网络名称
 * @param password WiFi网络密码
 * @return 是否添加成功
 */
bool WiFiManager::addWiFiConfig(const char* ssid, const char* password) {
    return saveWiFiConfig(ssid, password);
}

/**
 * @brief 清除所有WiFi配置
 * 删除所有保存的WiFi网络配置
 */
void WiFiManager::clearAllConfigs() {
    for (int i = 0; i < MAX_WIFI_NETWORKS; i++) {
        String key = "wifi_" + String(i);
        preferences.remove(key.c_str());
    }
    savedNetworkCount = 0;
    Serial.println("🗑️ 已清除所有WiFi配置");
}

/**
 * @brief 获取已保存的网络数量
 * @return 已保存的WiFi网络配置数量
 */
int WiFiManager::getSavedNetworkCount() {
    return savedNetworkCount;
}

/**
 * @brief 获取已保存的WiFi网络列表
 * 将保存的WiFi网络配置通过BLE发送给客户端
 */
void WiFiManager::getSavedNetworks() {
    Serial.printf("📋 [WiFi] 获取已保存的WiFi网络列表，共 %d 个\n", savedNetworkCount);
    
    if (savedNetworkCount == 0) {
        Serial.println("⚠️ 没有保存的WiFi网络");
        if (deviceConnected) {
            String responseMsg = String("{\"type\":\"savedNetworks\",\"success\":true,\"count\":0,\"networks\":[]}");
            sendJSONDataToBLE(responseMsg);
        }
        return;
    }
    
    String wifiList = String("{\"type\":\"savedNetworks\",\"success\":true,\"count\":") + String(savedNetworkCount) + String(",\"networks\":[");
    
    for (int i = 0; i < savedNetworkCount; i++) {
        if (i > 0) {
            wifiList += ",";
        }
        wifiList += String("{\"ssid\":\"") + String(savedNetworks[i].ssid) + String("\"}");
    }
    
    wifiList += "]}";
    
    Serial.printf("📤 [WiFi] 发送已保存的WiFi网络列表: %s\n", wifiList.c_str());
    
    if (deviceConnected) {
        sendJSONDataToBLE(wifiList);
    }
}

/**
 * @brief 更新WiFi管理器状态
 * 定期调用此函数，处理WiFi重连等状态管理
 */
void WiFiManager::update() {
    handleReconnect();
}