use crate::api_client::get_http_client;
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use reqwest::Client;
use base64::{Engine as _, engine::general_purpose};
use hmac::{Hmac, Mac};
use sha1::Sha1;
use std::time::{SystemTime, UNIX_EPOCH};

#[derive(Debug, Serialize, Deserialize)]
pub struct SteamGuardAccount {
    pub shared_secret: String,
    pub identity_secret: String,
    pub account_name: String,
    pub device_id: String,
    pub session: SessionData,
}

#[derive(Debug, Serialize, Deserialize)]
pub struct SessionData {
    pub steam_id: u64,
    pub access_token: String,
    pub refresh_token: String,
}

#[derive(Debug, Serialize, Deserialize)]
pub struct Confirmation {
    pub id: String,
    pub key: String,
    pub conf_type: i32,
    pub creator: u64,
    pub headline: String,
    pub summary: Vec<String>,
    pub accept: String,
    pub cancel: String,
    pub icon: Option<String>,
}

#[derive(Debug, Serialize, Deserialize)]
struct ConfirmationsResponse {
    success: bool,
    message: Option<String>,
    need_authentication: bool,
    confirmations: Vec<Confirmation>,
}

#[derive(Debug, Serialize, Deserialize)]
struct SendConfirmationResponse {
    success: bool,
}

impl SteamGuardAccount {
    /// 生成Steam验证码
    pub fn generate_code(&self) -> Result<String, Box<dyn std::error::Error>> {
        let time = Self::get_steam_time();
        self.generate_code_for_time(time)
    }

    /// 为指定时间生成Steam验证码
    pub fn generate_code_for_time(&self, time: u64) -> Result<String, Box<dyn std::error::Error>> {
        let shared_secret = general_purpose::STANDARD.decode(&self.shared_secret)?;

        // 计算时间窗口
        let time_bytes = (time / 30).to_be_bytes();
        let mut time_buffer = [0u8; 8];
        time_buffer.copy_from_slice(&time_bytes[4..8]); // 只取后4字节

        // HMAC-SHA1
        let mut mac = Hmac::<Sha1>::new_from_slice(&shared_secret)?;
        mac.update(&time_buffer);
        let result = mac.finalize().into_bytes();

        // 动态截断
        let offset = (result[19] & 0x0F) as usize;
        let mut code_bytes = [0u8; 4];
        code_bytes.copy_from_slice(&result[offset..offset + 4]);
        let code = u32::from_be_bytes(code_bytes);

        // 生成5位验证码
        const STEAM_CHARS: &[u8] = b"23456789BCDFGHJKMNPQRTVWXY";
        let mut code_str = String::with_capacity(5);

        for i in 0..5 {
            let index = ((code >> (i * 5)) & 0x1F) as usize;
            code_str.push(STEAM_CHARS[index] as char);
        }

        Ok(code_str.chars().rev().collect())
    }

    /// 获取Steam服务器时间
    pub fn get_steam_time() -> u64 {
        let now = SystemTime::now()
            .duration_since(UNIX_EPOCH)
            .unwrap()
            .as_secs();

        // Steam时间偏移（通常需要从API获取，这里简化处理）
        now + 2 // 简单的2秒偏移
    }

    /// 生成确认查询参数
    fn generate_confirmation_query_params(&self, tag: &str, time: u64) -> HashMap<String, String> {
        let identity_secret = general_purpose::STANDARD.decode(&self.identity_secret).unwrap();

        // 生成确认哈希
        let time_bytes = time.to_be_bytes();
        let tag_bytes = tag.as_bytes();
        let mut data = Vec::with_capacity(8 + tag_bytes.len());
        data.extend_from_slice(&time_bytes);
        data.extend_from_slice(tag_bytes);

        let mut mac = Hmac::<Sha1>::new_from_slice(&identity_secret).unwrap();
        mac.update(&data);
        let hash = mac.finalize().into_bytes();

        let mut params = HashMap::new();
        params.insert("p".to_string(), self.device_id.clone());
        params.insert("a".to_string(), self.session.steam_id.to_string());
        params.insert("k".to_string(), general_purpose::STANDARD.encode(&hash));
        params.insert("t".to_string(), time.to_string());
        params.insert("m".to_string(), "react".to_string());
        params.insert("tag".to_string(), tag.to_string());

        params
    }

    /// 获取确认列表
    pub async fn fetch_confirmations(&self) -> Result<Vec<Confirmation>, Box<dyn std::error::Error>> {
        let client = get_http_client();
        let time = Self::get_steam_time();

        let params = self.generate_confirmation_query_params("conf", time);
        let query_string = params.iter()
            .map(|(k, v)| format!("{}={}", k, v))
            .collect::<Vec<_>>()
            .join("&");

        let url = format!("https://steamcommunity.com/mobileconf/getlist?{}", query_string);

        let response = client
            .get(&url)
            .header("User-Agent", "Mozilla/5.0 (Linux; Android 10; SM-G973F) AppleWebKit/537.36")
            .header("Cookie", format!("steamLoginSecure={}", self.session.access_token))
            .send()
            .await?;

        let response_text = response.text().await?;
        let confirmations_response: ConfirmationsResponse = serde_json::from_str(&response_text)?;

        if !confirmations_response.success {
            return Err(format!("Failed to fetch confirmations: {:?}", confirmations_response.message).into());
        }

        Ok(confirmations_response.confirmations)
    }

    /// 接受确认
    pub async fn accept_confirmation(&self, conf: &Confirmation) -> Result<bool, Box<dyn std::error::Error>> {
        self.send_confirmation_ajax(conf, "allow").await
    }

    /// 拒绝确认
    pub async fn deny_confirmation(&self, conf: &Confirmation) -> Result<bool, Box<dyn std::error::Error>> {
        self.send_confirmation_ajax(conf, "cancel").await
    }

    /// 发送确认操作
    async fn send_confirmation_ajax(&self, conf: &Confirmation, op: &str) -> Result<bool, Box<dyn std::error::Error>> {
        let client = get_http_client();
        let time = Self::get_steam_time();
        let tag = if op == "allow" { "accept" } else { "reject" };

        let mut params = self.generate_confirmation_query_params(tag, time);
        params.insert("op".to_string(), op.to_string());
        params.insert("cid".to_string(), conf.id.clone());
        params.insert("ck".to_string(), conf.key.clone());

        let query_string = params.iter()
            .map(|(k, v)| format!("{}={}", k, v))
            .collect::<Vec<_>>()
            .join("&");

        let url = format!("https://steamcommunity.com/mobileconf/ajaxop?{}", query_string);

        let response = client
            .get(&url)
            .header("User-Agent", "Mozilla/5.0 (Linux; Android 10; SM-G973F) AppleWebKit/537.36")
            .header("Cookie", format!("steamLoginSecure={}", self.session.access_token))
            .send()
            .await?;

        let response_text = response.text().await?;
        let conf_response: SendConfirmationResponse = serde_json::from_str(&response_text)?;

        Ok(conf_response.success)
    }
}