package ragflow

import (
	"context"

	"github.com/gogf/gf/v2/errors/gerror"
)

// 会话管理
// 参考: https://ragflow.com.cn/docs/dev/http_api_reference#会话管理

// Session 会话结构体
type Session struct {
	Id         string    `json:"id"`
	Name       string    `json:"name"`
	ChatId     string    `json:"chat_id"` // 响应中是 "chat" 或 "chat_id"，根据文档示例调整
	Messages   []Message `json:"messages"`
	CreateDate string    `json:"create_date"`
	CreateTime int64     `json:"create_time"`
	UpdateDate string    `json:"update_date"`
	UpdateTime int64     `json:"update_time"`
}

type Message struct {
	Content string `json:"content"`
	Role    string `json:"role"`
}

// CreateSessionReq 创建会话请求
type CreateSessionReq struct {
	Name   string `json:"name"`
	UserId string `json:"user_id,omitempty"`
}

// ListSessionsReq 列出会话请求
type ListSessionsReq struct {
	Page     int    `json:"page,omitempty"`
	PageSize int    `json:"page_size,omitempty"`
	OrderBy  string `json:"orderby,omitempty"`
	Desc     bool   `json:"desc,omitempty"`
	Name     string `json:"name,omitempty"`
	Id       string `json:"id,omitempty"`
	UserId   string `json:"user_id,omitempty"`
}

// ListSessionsRes 列出会话响应
// 注意：API 不返回 total 字段，仅返回 data 数组
type ListSessionsRes struct {
	Code int        `json:"code"` // 状态码，0 表示成功
	Data []*Session `json:"data"` // 会话列表
}

// DeleteSessionsReq 删除会话请求
type DeleteSessionsReq struct {
	Ids []string `json:"ids"`
}

// ChatCompletionReq 对话请求
type ChatCompletionReq struct {
	Question  string `json:"question"`
	Stream    bool   `json:"stream"`
	SessionId string `json:"session_id,omitempty"`
	UserId    string `json:"user_id,omitempty"`
}

// ChatCompletionRes 对话响应 (非流式)
type ChatCompletionRes struct {
	Code    int    `json:"code"`
	Message string `json:"message"` // 错误信息
	Data    struct {
		Answer      string      `json:"answer"`
		Reference   interface{} `json:"reference"`
		AudioBinary interface{} `json:"audio_binary"`
		Id          interface{} `json:"id"`
		SessionId   string      `json:"session_id"`
	} `json:"data"`
}

// CreateSession 创建会话
func (c *Client) CreateSession(ctx context.Context, chatId string, req *CreateSessionReq) (*Session, error) {
	path := "/api/v1/chats/" + chatId + "/sessions"
	var res struct {
		Code int      `json:"code"`
		Data *Session `json:"data"`
		Msg  string   `json:"message"`
	}
	if err := c.request(ctx, "POST", path, req, &res); err != nil {
		return nil, err
	}
	if res.Code != 0 {
		return nil, gerror.Newf("create session failed: %s", res.Msg)
	}
	return res.Data, nil
}

// ListSessions 列出会话
func (c *Client) ListSessions(ctx context.Context, chatId string, req *ListSessionsReq) (*ListSessionsRes, error) {
	path := "/api/v1/chats/" + chatId + "/sessions"
	params := map[string]interface{}{}
	if req.Page > 0 {
		params["page"] = req.Page
	}
	if req.PageSize > 0 {
		params["page_size"] = req.PageSize
	}
	if req.OrderBy != "" {
		params["orderby"] = req.OrderBy
	}
	if req.Desc {
		params["desc"] = "true"
	} else {
		params["desc"] = "false"
	}
	if req.Name != "" {
		params["name"] = req.Name
	}
	if req.Id != "" {
		params["id"] = req.Id
	}
	if req.UserId != "" {
		params["user_id"] = req.UserId
	}

	query := buildQueryString(params)
	if query != "" {
		path += "?" + query
	}

	var res ListSessionsRes
	if err := c.request(ctx, "GET", path, nil, &res); err != nil {
		return nil, err
	}
	if res.Code != 0 {
		return nil, gerror.Newf("list sessions failed: code=%d", res.Code)
	}
	return &res, nil
}

// DeleteSessions 删除会话
func (c *Client) DeleteSessions(ctx context.Context, chatId string, ids []string) (err error) {
	req := DeleteSessionsReq{Ids: ids}
	var res CommonResponse
	path := "/api/v1/chats/" + chatId + "/sessions"
	if err = c.request(ctx, "DELETE", path, req, &res); err != nil {
		return
	}
	if !res.IsSuccess() {
		return gerror.Newf("delete sessions failed: %s", res.Message)
	}
	return
}

// ChatCompletion 对话 (目前仅支持非流式)
func (c *Client) ChatCompletion(ctx context.Context, chatId string, req *ChatCompletionReq) (*ChatCompletionRes, error) {
	path := "/api/v1/chats/" + chatId + "/completions"
	var res ChatCompletionRes

	// 如果需要流式支持，需要使用 gclient 的流式处理能力，这里暂只实现非流式
	if req.Stream {
		return nil, gerror.New("stream mode not supported yet")
	}

	if err := c.request(ctx, "POST", path, req, &res); err != nil {
		return nil, err
	}
	if res.Code != 0 {
		return nil, gerror.Newf("chat completion failed: code=%d, message=%s", res.Code, res.Message)
	}
	return &res, nil
}