package service

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"time"
)

// AgentChatRequest Python Agent 对话请求
type AgentChatRequest struct {
	AgentID   int    `json:"agent_id"`
	Message   string `json:"message"`
	UserID    int    `json:"user_id"`
	SessionID string `json:"session_id,omitempty"`
}

// AgentChatResponse Python Agent 对话响应
type AgentChatResponse struct {
	AgentID    int             `json:"agent_id"`
	Response   string          `json:"response"`
	ToolCalls  []interface{}   `json:"tool_calls"`
	TokensUsed int            `json:"tokens_used"`
	DurationMs int            `json:"duration_ms"`
	SessionID  string         `json:"session_id"`
}

// TeamChatRequest 多智能体群聊请求
type TeamChatRequest struct {
	SupervisorAgentID int      `json:"supervisor_agent_id"`
	MemberAgentIDs    []int    `json:"member_agent_ids"`
	Message          string   `json:"message"`
	UserID           int      `json:"user_id"`
	SessionID        string   `json:"session_id,omitempty"`
	Strategy         string   `json:"strategy,omitempty"`
}

// TeamChatResponse 多智能体群聊响应
type TeamChatResponse struct {
	SupervisorAgentID int             `json:"supervisor_agent_id"`
	Response         string          `json:"response"`
	SubtaskResults   []interface{}   `json:"subtask_results"`
	Strategy         string          `json:"strategy"`
	DurationMs       int             `json:"duration_ms"`
	SessionID        string          `json:"session_id"`
}

// AgentService Python Agent 服务
type AgentService struct {
	pythonURL string
	client    *http.Client
}

// NewAgentService 创建 Agent 服务
func NewAgentService(pythonURL string) *AgentService {
	return &AgentService{
		pythonURL: pythonURL,
		client: &http.Client{
			Timeout: 120 * time.Second, // Agent 可能需要较长时间
		},
	}
}

// Chat 单智能体对话
func (s *AgentService) Chat(req AgentChatRequest) (*AgentChatResponse, error) {
	url := fmt.Sprintf("%s/agent/chat", s.pythonURL)

	jsonData, err := json.Marshal(req)
	if err != nil {
		return nil, fmt.Errorf("failed to marshal request: %w", err)
	}

	httpReq, err := http.NewRequest("POST", url, bytes.NewBuffer(jsonData))
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}
	httpReq.Header.Set("Content-Type", "application/json")

	resp, err := s.client.Do(httpReq)
	if err != nil {
		return nil, fmt.Errorf("failed to call python agent: %w", err)
	}
	defer resp.Body.Close()

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, fmt.Errorf("failed to read response: %w", err)
	}

	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("python agent error: %s", string(body))
	}

	var result AgentChatResponse
	if err := json.Unmarshal(body, &result); err != nil {
		return nil, fmt.Errorf("failed to unmarshal response: %w", err)
	}

	return &result, nil
}

// TeamChat 多智能体群聊
func (s *AgentService) TeamChat(req TeamChatRequest) (*TeamChatResponse, error) {
	url := fmt.Sprintf("%s/agent/team/chat", s.pythonURL)

	// 设置默认策略
	if req.Strategy == "" {
		req.Strategy = "parallel"
	}

	jsonData, err := json.Marshal(req)
	if err != nil {
		return nil, fmt.Errorf("failed to marshal request: %w", err)
	}

	httpReq, err := http.NewRequest("POST", url, bytes.NewBuffer(jsonData))
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}
	httpReq.Header.Set("Content-Type", "application/json")

	resp, err := s.client.Do(httpReq)
	if err != nil {
		return nil, fmt.Errorf("failed to call python agent: %w", err)
	}
	defer resp.Body.Close()

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, fmt.Errorf("failed to read response: %w", err)
	}

	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("python agent error: %s", string(body))
	}

	var result TeamChatResponse
	if err := json.Unmarshal(body, &result); err != nil {
		return nil, fmt.Errorf("failed to unmarshal response: %w", err)
	}

	return &result, nil
}