package server

// chat_export_api.go — P3 聊天记录导出查询 API
//
// GET /api/v1/chat/export/messages?session_id=...&date_from=...&date_to=...&category=...
//
// 返回按条件过滤后的消息列表，支持客户端导出为 docx/xlsx 等格式。

import (
	"net/http"
	"strings"

	"chat-agent-system/internal/app/chatflow"
	"chat-agent-system/internal/ctxmgr"
	"chat-agent-system/internal/replyexport"
)

func (s *Server) handleChatExportMessages(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		writeSafeError(w, r, http.StatusMethodNotAllowed, "Method Not Allowed")
		return
	}

	user, ok := s.requireAuthenticatedUser(w, r)
	if !ok {
		return
	}

	sessionID := strings.TrimSpace(r.URL.Query().Get("session_id"))
	if sessionID == "" {
		writeSafeError(w, r, http.StatusBadRequest, "missing required query param 'session_id'")
		return
	}

	if s.chatLog == nil {
		writeSafeError(w, r, http.StatusServiceUnavailable, "context manager not initialized")
		return
	}

	msgs, err := s.chatLog.Export(r.Context(), s.chatPrincipal(user, chatflow.ActionExport), chatflow.ExportQuery{
		SessionID: sessionID,
		DateFrom:  strings.TrimSpace(r.URL.Query().Get("date_from")),
		DateTo:    strings.TrimSpace(r.URL.Query().Get("date_to")),
		Category:  strings.TrimSpace(r.URL.Query().Get("category")),
	})
	if err != nil {
		s.writeChatLogError(w, err)
		return
	}

	filtered := make([]ctxmgr.ChatMessageRecord, 0, len(msgs))
	for _, m := range msgs {
		hasCard := false
		if m.Metadata != nil {
			if _, exists := m.Metadata["interactive_card"]; exists {
				hasCard = true
			}
		}
		_, cap := replyexport.EvaluatePolicy(replyexport.PolicyOptions{
			Role:               m.Role,
			Status:             "completed",
			Content:            m.Content,
			HasInteractiveCard: hasCard,
			Revision:           m.ContentRevision,
		})
		if cap.Policy == replyexport.PolicyNone {
			continue
		}
		filtered = append(filtered, m)
	}

	writeJSONResponse(w, http.StatusOK, filtered)
}