package v1

import (
	"net/http"
	"strconv"

	"github.com/gin-gonic/gin"

	"github.com/gochat/gochat/internal/service"
	applogger "github.com/gochat/gochat/pkg/logger"
)

// WebWidgetOfflineHandler handles admin CRUD for widget offline messages.
// These endpoints require agent JWT authentication and account scope.
// Reference: Chatwoot admin view of pending offline messages from web widget visitors.
type WebWidgetOfflineHandler struct {
	widgetSvc *service.WidgetService
	inboxSvc  *service.InboxService
}

// NewWebWidgetOfflineHandler creates a new admin widget offline message handler.
func NewWebWidgetOfflineHandler(widgetSvc *service.WidgetService, inboxSvc *service.InboxService) *WebWidgetOfflineHandler {
	return &WebWidgetOfflineHandler{widgetSvc: widgetSvc, inboxSvc: inboxSvc}
}

// ListOfflineMessages retrieves paginated offline messages for an account.
// GET /api/v1/accounts/:account_id/web_widgets/offline_messages
func (h *WebWidgetOfflineHandler) ListOfflineMessages(c *gin.Context) {
	accountIDStr := c.Param("id")
	accountID, err := strconv.ParseUint(accountIDStr, 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid account_id"})
		return
	}

	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "25"))
	if page < 1 {
		page = 1
	}
	if pageSize < 1 || pageSize > 100 {
		pageSize = 25
	}

	msgs, total, err := h.widgetSvc.ListOfflineMessagesByAccount(c.Request.Context(), uint(accountID), page, pageSize)
	if err != nil {
		applogger.L().Errorf("Failed to list offline messages for account=%d: %v", accountID, err)
		c.JSON(http.StatusUnprocessableEntity, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"offline_messages": msgs,
		"meta": gin.H{
			"page":        page,
			"page_size":   pageSize,
			"total_count": total,
		},
	})
}

// ListOfflineMessagesByInbox retrieves offline messages for a specific inbox.
// GET /api/v1/accounts/:account_id/inboxes/:inbox_id/web_widget/offline_messages
func (h *WebWidgetOfflineHandler) ListOfflineMessagesByInbox(c *gin.Context) {
	inboxIDStr := c.Param("inbox_id")
	inboxID, err := strconv.ParseUint(inboxIDStr, 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid inbox_id"})
		return
	}

	accountIDStr := c.Param("id")
	accountID, err := strconv.ParseUint(accountIDStr, 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid account_id"})
		return
	}

	// Verify inbox belongs to account
	inbox, err := h.inboxSvc.GetByAccountAndID(c.Request.Context(), uint(accountID), uint(inboxID))
	if err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "inbox not found"})
		return
	}
	if inbox.ChannelType != "web_widget" {
		c.JSON(http.StatusBadRequest, gin.H{"error": "offline messages only supported for web_widget channel"})
		return
	}

	msgs, err := h.widgetSvc.GetOfflineMessages(c.Request.Context(), uint(inboxID))
	if err != nil {
		applogger.L().Errorf("Failed to get offline messages for inbox=%d: %v", inboxID, err)
		c.JSON(http.StatusUnprocessableEntity, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{"offline_messages": msgs})
}

// DismissOfflineMessage marks an offline message as dismissed by an agent.
// PUT /api/v1/accounts/:account_id/web_widgets/offline_messages/:offline_message_id/dismiss
func (h *WebWidgetOfflineHandler) DismissOfflineMessage(c *gin.Context) {
	offlineMsgIDStr := c.Param("offline_message_id")
	offlineMsgID, err := strconv.ParseUint(offlineMsgIDStr, 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid offline_message_id"})
		return
	}

	err = h.widgetSvc.DismissOfflineMessage(c.Request.Context(), uint(offlineMsgID))
	if err != nil {
		applogger.L().Errorf("Failed to dismiss offline message=%d: %v", offlineMsgID, err)
		c.JSON(http.StatusUnprocessableEntity, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{"message": "offline message dismissed"})
}

// ConvertOfflineMessage converts an offline message into a conversation.
// PUT /api/v1/accounts/:account_id/web_widgets/offline_messages/:offline_message_id/convert
func (h *WebWidgetOfflineHandler) ConvertOfflineMessage(c *gin.Context) {
	offlineMsgIDStr := c.Param("offline_message_id")
	offlineMsgID, err := strconv.ParseUint(offlineMsgIDStr, 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid offline_message_id"})
		return
	}

	conversation, message, err := h.widgetSvc.ConvertOfflineMessageToConversation(c.Request.Context(), uint(offlineMsgID))
	if err != nil {
		applogger.L().Errorf("Failed to convert offline message=%d: %v", offlineMsgID, err)
		c.JSON(http.StatusUnprocessableEntity, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"conversation": conversation,
		"message":      message,
	})
}