package v1

import (
	"net/http"

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

// EnterpriseAccountHandler implements Chatwoot enterprise account billing and
// limit endpoints consumed by the reused dashboard EnterpriseAccountAPI client.
type EnterpriseAccountHandler struct {
	svc *service.AccountService
}

func NewEnterpriseAccountHandler(svc *service.AccountService) *EnterpriseAccountHandler {
	return &EnterpriseAccountHandler{svc: svc}
}

func enterpriseAccountID(c *gin.Context) uint {
	if id := parseAccountIDParam(c); id != 0 {
		return id
	}
	return getAccountID(c)
}

// Limits returns account usage limits in Chatwoot's enterprise payload shape.
// GET /enterprise/api/v1/accounts/:account_id/limits
func (h *EnterpriseAccountHandler) Limits(c *gin.Context) {
	accountID := enterpriseAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account id")
		return
	}

	payload, err := h.svc.EnterpriseLimits(c.Request.Context(), accountID, getUserID(c))
	if err != nil {
		response.AbortWithStatusError(c, http.StatusNotFound, response.ErrAccountNotFound, "account not found")
		return
	}
	c.JSON(http.StatusOK, payload)
}

// ToggleDeletion marks or unmarks an account for scheduled deletion.
// POST /enterprise/api/v1/accounts/:account_id/toggle_deletion
func (h *EnterpriseAccountHandler) ToggleDeletion(c *gin.Context) {
	accountID := enterpriseAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account id")
		return
	}

	var req struct {
		ActionType string `json:"action_type" form:"action_type"`
	}
	_ = c.ShouldBind(&req)

	switch req.ActionType {
	case "delete":
		if _, err := h.svc.MarkForDeletion(c.Request.Context(), accountID, getUserID(c), "manual_deletion"); err != nil {
			response.AbortWithStatusError(c, http.StatusUnprocessableEntity, response.ErrValidation, err.Error())
			return
		}
		c.JSON(http.StatusOK, gin.H{"message": "Account marked for deletion"})
	case "undelete":
		if _, err := h.svc.UnmarkForDeletion(c.Request.Context(), accountID, getUserID(c)); err != nil {
			response.AbortWithStatusError(c, http.StatusUnprocessableEntity, response.ErrValidation, err.Error())
			return
		}
		c.JSON(http.StatusOK, gin.H{"message": "Account unmarked for deletion"})
	default:
		c.JSON(http.StatusUnprocessableEntity, gin.H{"error": "Invalid action_type. Must be either \"delete\" or \"undelete\""})
	}
}

// Subscription mirrors the Cloud customer-creation guard and returns no content.
// POST /enterprise/api/v1/accounts/:account_id/subscription
func (h *EnterpriseAccountHandler) Subscription(c *gin.Context) {
	accountID := enterpriseAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account id")
		return
	}
	if err := h.svc.EnsureEnterpriseAccountCustomerCreationFlag(c.Request.Context(), accountID, getUserID(c)); err != nil {
		response.AbortWithStatusError(c, http.StatusNotFound, response.ErrAccountNotFound, "account not found")
		return
	}
	c.Status(http.StatusNoContent)
}

// Checkout returns Chatwoot's billing-details error when no Stripe session can be created locally.
// POST /enterprise/api/v1/accounts/:account_id/checkout
func (h *EnterpriseAccountHandler) Checkout(c *gin.Context) {
	accountID := enterpriseAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account id")
		return
	}
	if _, err := h.svc.GetByUserAndID(c.Request.Context(), getUserID(c), accountID); err != nil {
		response.AbortWithStatusError(c, http.StatusNotFound, response.ErrAccountNotFound, "account not found")
		return
	}
	c.JSON(http.StatusUnprocessableEntity, gin.H{"error": "Please subscribe to a plan before viewing the billing details"})
}

// TopupCheckout validates credits and exposes a provider-unavailable boundary for local installs.
// POST /enterprise/api/v1/accounts/:account_id/topup_checkout
func (h *EnterpriseAccountHandler) TopupCheckout(c *gin.Context) {
	accountID := enterpriseAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account id")
		return
	}
	if _, err := h.svc.GetByUserAndID(c.Request.Context(), getUserID(c), accountID); err != nil {
		response.AbortWithStatusError(c, http.StatusNotFound, response.ErrAccountNotFound, "account not found")
		return
	}

	var req struct {
		Credits int `json:"credits" form:"credits"`
	}
	_ = c.ShouldBind(&req)
	if req.Credits <= 0 {
		c.JSON(http.StatusUnprocessableEntity, gin.H{"error": "Credits are required"})
		return
	}
	c.JSON(http.StatusUnprocessableEntity, gin.H{"error": "Top-up checkout provider is not configured"})
}