use regex::Regex;
use std::env;

use ias_common::model::ai::{
    ChatCompletionRequestBody, ChatCompletionRequestExtra, ChatCompletionRequestMessage,
    ChatCompletionRequestThinking, ChatCompletionResponseBody,
};
use ias_common::queue::{AssistantMessage, ChannelMessage, QueueMessage};

use crate::toolkit::{call_tools, get_tool, tool_notice_text};

pub async fn send_message(
    sender: tokio::sync::mpsc::Sender<QueueMessage>,
    messages: Vec<ChatCompletionRequestMessage>,
    channel: ChannelMessage,
) -> anyhow::Result<()> {
    let result = request_llm(messages).await;
    match result {
        Ok(result) => {
            let Some(result) = result else {
                eprintln!("LLM 请求没有返回有效响应体");
                return Ok(());
            };

            for choice in result.choices {
                let raw_message = serde_json::to_value(&choice.message).ok();
                let messsage_content = choice.message.content.clone().unwrap_or_default();
                let messsage_reasoning = choice.message.reasoning_content.unwrap_or_default();
                let tool_calls = choice.message.tool_calls.clone();

                sender
                    .send(QueueMessage::Aissitant(
                        channel.clone(),
                        AssistantMessage {
                            reasoning: Some(messsage_reasoning),
                            content: messsage_content,
                            tool_calls,
                            raw_message,
                        },
                    ))
                    .await
                    .unwrap();

                match choice.message.tool_calls {
                    Some(tool_calls) => {
                        if tool_calls.is_empty() {
                            eprintln!("模型返回 tool_calls 字段，但列表为空");
                            continue;
                        }

                        println!("模型请求调用{}个工具", tool_calls.len());
                        if let Some(text) = tool_notice_text(&tool_calls) {
                            sender
                                .send(QueueMessage::Notice(channel.clone(), text))
                                .await
                                .unwrap();
                        }

                        match call_tools(channel.clone(), tool_calls).await {
                            Ok(Some(queue_message)) => {
                                sender.send(queue_message).await.unwrap();
                            }
                            Ok(None) => {
                                eprintln!("工具调用没有生成后续队列消息");
                            }
                            Err(error) => {
                                eprintln!("工具调用失败: {error}");
                            }
                        }
                    }
                    None => {
                        eprintln!("没有调用工具");
                    }
                }
            }
        }
        Err(err) => {
            eprintln!("发送错误:{}", err);
        }
    }

    Ok(())
}

pub async fn request_llm(
    messages: Vec<ChatCompletionRequestMessage>,
) -> anyhow::Result<Option<ChatCompletionResponseBody>> {
    let client = reqwest::Client::new();
    let base_url =
        env::var("PROVIDER_BASE_URL").map_err(|_| anyhow::anyhow!("必须设置PROVIDER_BASE_URL"))?;
    let chat_re = Regex::new(r"(?i)(?:^|/)(?:v\d+/)?chat/completions/?$")?;
    let version_re = Regex::new(r"(?i)(?:^|/)v\d+$")?;

    let request_url = if chat_re.is_match(&base_url) {
        base_url.to_string()
    } else if version_re.is_match(&base_url) {
        format!("{}/chat/completions", base_url)
    } else {
        format!("{}/v1/chat/completions", base_url)
    };
    let api_key =
        env::var("PROVIDER_API_KEY").map_err(|_| anyhow::anyhow!("必须设置PROVIDER_API_KEY"))?;
    let model_name = env::var("PROVIDER_MODEL").unwrap_or_else(|_| "deepseek-v4-flash".to_string());
    let body = ChatCompletionRequestBody {
        model: model_name,
        messages,
        stream: false,
        tools: get_tool(),
        extra_body: Some(ChatCompletionRequestExtra {
            thinking: ChatCompletionRequestThinking {
                thinking_type: "enabled".to_string(),
            },
        }),
    };
    let resp = client
        .post(request_url)
        .bearer_auth(api_key)
        .json(&body)
        .send()
        .await;

    match resp {
        Ok(resp) => {
            let status = resp.status();
            let text = resp.text().await.unwrap_or_default();
            // println!("response:\n{}", text);
            if status.is_success() {
                match serde_json::from_str::<ChatCompletionResponseBody>(&text) {
                    Ok(result) => return Ok(Some(result)),
                    Err(error) => {
                        eprintln!("LLM 响应解析失败: {error}");
                        eprintln!("body: {text}");
                    }
                }
            } else {
                eprintln!("HTTP 请求失败");
                eprintln!("status: {}", status);
                eprintln!("body: {}", text);
            }
        }
        Err(err) => {
            eprintln!("请求发送失败: {}", err);

            if err.is_timeout() {
                eprintln!("原因: 请求超时");
            }

            if err.is_connect() {
                eprintln!("原因: 连接失败");
            }

            if let Some(url) = err.url() {
                eprintln!("url: {}", url);
            }
        }
    }
    Ok(None)
}