package v1

import (
	"net/http"
	"strconv"

	"github.com/gin-gonic/gin"

	"github.com/gochat/gochat/internal/service"
	"github.com/gochat/gochat/pkg/response"
)

// AgentBotInboxHandler handles bot-inbox binding endpoints.
// Reference: Chatwoot app/controllers/api/v1/accounts/agent_bot_inboxes_controller.rb
type AgentBotInboxHandler struct {
	svc *service.AgentBotInboxService
}

// NewAgentBotInboxHandler creates a new AgentBotInbox handler with service injection.
func NewAgentBotInboxHandler(svc *service.AgentBotInboxService) *AgentBotInboxHandler {
	return &AgentBotInboxHandler{svc: svc}
}

// Bind creates a new bot-inbox binding (status=active).
// POST /api/v1/accounts/:account_id/agent_bot_inboxes
func (h *AgentBotInboxHandler) Bind(c *gin.Context) {
	accountID, err := parseUintParam(c, "account_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
		return
	}

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

	binding, svcErr := h.svc.Bind(c.Request.Context(), accountID, req)
	if svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	response.Created(c, binding)
}

// Unbind removes a bot-inbox binding by ID.
// DELETE /api/v1/accounts/:account_id/agent_bot_inboxes/:id
func (h *AgentBotInboxHandler) Unbind(c *gin.Context) {
	id, err := parseUintParam(c, "id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid binding ID")
		return
	}

	if svcErr := h.svc.Unbind(c.Request.Context(), id); svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	response.NoContent(c)
}

// UpdateStatus toggles a binding's active/inactive status.
// PATCH /api/v1/accounts/:account_id/agent_bot_inboxes/:id/status
func (h *AgentBotInboxHandler) UpdateStatus(c *gin.Context) {
	id, err := parseUintParam(c, "id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid binding ID")
		return
	}

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

	if _, svcErr := h.svc.UpdateStatus(c.Request.Context(), id, req); svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	response.OK(c, gin.H{
		"id":     id,
		"status": req.Status,
	})
}

// ListByInbox retrieves all bot-inbox bindings for a given inbox.
// GET /api/v1/accounts/:account_id/agent_bot_inboxes?inbox_id=X
func (h *AgentBotInboxHandler) ListByInbox(c *gin.Context) {
	inboxIDStr := c.Query("inbox_id")
	if inboxIDStr == "" {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "inbox_id query parameter required")
		return
	}
	inboxID, err := parseUintQuery(inboxIDStr)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid inbox_id")
		return
	}

	bindings, svcErr := h.svc.ListByInbox(c.Request.Context(), inboxID)
	if svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	response.OK(c, bindings)
}

// ListByBot retrieves all bot-inbox bindings for a given agent bot.
// GET /api/v1/accounts/:account_id/agent_bot_inboxes?agent_bot_id=X
func (h *AgentBotInboxHandler) ListByBot(c *gin.Context) {
	botIDStr := c.Query("agent_bot_id")
	if botIDStr == "" {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "agent_bot_id query parameter required")
		return
	}
	botID, err := parseUintQuery(botIDStr)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid agent_bot_id")
		return
	}

	bindings, svcErr := h.svc.ListByBot(c.Request.Context(), botID)
	if svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	response.OK(c, bindings)
}

// parseUintQuery parses a uint from a query string value.
func parseUintQuery(s string) (uint, error) {
	n, err := strconv.ParseUint(s, 10, 32)
	if err != nil {
		return 0, err
	}
	return uint(n), nil
}