package v1

import (
	"encoding/json"
	"net/http"

	"github.com/gin-gonic/gin"
	"github.com/gochat/gochat/internal/service"
	applogger "github.com/gochat/gochat/pkg/logger"
	"github.com/gochat/gochat/pkg/response"
)

// CaptainBulkActionHandler handles bulk AI operations on multiple conversations.
// Reference: Chatwoot Captain::BulkActionsController
type CaptainBulkActionHandler struct {
	svc *service.CaptainBulkActionService
}

func NewCaptainBulkActionHandler(svc *service.CaptainBulkActionService) *CaptainBulkActionHandler {
	return &CaptainBulkActionHandler{svc: svc}
}

// Execute performs a bulk AI action on multiple conversations.
// POST /api/v1/accounts/:id/captain/bulk_actions
func (h *CaptainBulkActionHandler) Execute(c *gin.Context) {
	accountID := parseAccountIDParam(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
		return
	}

	body, err := c.GetRawData()
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}

	var chatwootReq service.ChatwootBulkActionRequest
	if err := json.Unmarshal(body, &chatwootReq); err == nil && chatwootReq.Type != "" {
		h.executeChatwoot(c, accountID, &chatwootReq)
		return
	}

	var req service.BulkActionRequest
	if err := json.Unmarshal(body, &req); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}

	// Validate action type
	validActions := map[service.BulkActionType]bool{
		service.BulkActionLabelSuggestion: true,
		service.BulkActionReplySuggestion: true,
		service.BulkActionFollowUp:        true,
	}
	if !validActions[req.Action] {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, "unsupported action type: "+string(req.Action))
		return
	}

	if len(req.ConversationIDs) == 0 {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, "conversation_ids required")
		return
	}

	result, err := h.svc.Execute(c.Request.Context(), accountID, &req)
	if err != nil {
		applogger.L().Errorf("Bulk action: %v", err)
		response.AbortWithStatusError(c, http.StatusInternalServerError, response.ErrInternal, "failed to execute bulk action")
		return
	}

	response.OK(c, result)
}

func (h *CaptainBulkActionHandler) executeChatwoot(c *gin.Context, accountID uint, req *service.ChatwootBulkActionRequest) {
	result, err := h.svc.ExecuteChatwoot(c.Request.Context(), accountID, req)
	if err != nil {
		applogger.L().Errorf("Chatwoot bulk action: %v", err)
		c.JSON(http.StatusUnprocessableEntity, gin.H{"success": false})
		return
	}

	if result.Empty {
		c.JSON(http.StatusOK, []gin.H{})
		return
	}
	if result.AssistantResponses != nil {
		payload := make([]gin.H, 0, len(result.AssistantResponses))
		for i := range result.AssistantResponses {
			payload = append(payload, captainAssistantResponsePayload(&result.AssistantResponses[i]))
		}
		c.JSON(http.StatusOK, payload)
		return
	}
	if result.IDs != nil {
		c.JSON(http.StatusOK, gin.H{"ids": result.IDs, "count": result.Count})
		return
	}
	c.JSON(http.StatusOK, gin.H{"count": result.Count})
}