package v1

import (
	"net/http"
	"strconv"

	"github.com/gin-gonic/gin"

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

// AuditHandler handles audit log listing and retrieval.
// Reference: Chatwoot enterprise audit logs controller + P2B M11 spec
type AuditHandler struct {
	svc *service.AuditService
}

// NewAuditHandler creates a new AuditLog handler.
func NewAuditHandler(svc *service.AuditService) *AuditHandler {
	return &AuditHandler{svc: svc}
}

// List retrieves paginated audit log entries for the current account.
// GET /api/v1/accounts/:account_id/audit_logs
// Query filters: action, auditable_type
func (h *AuditHandler) List(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "account not identified")
		return
	}

	pg := pagination.Parse(c)

	action := c.Query("action")
	auditableType := c.Query("auditable_type")

	audits, total, svcErr := h.svc.ListByAccount(c.Request.Context(), accountID, action, auditableType, pg.Page, pg.PerPage)
	if svcErr != nil {
		applogger.L().Errorf("AuditHandler.List account=%d: %v", accountID, svcErr)
		handleServiceError(c, svcErr)
		return
	}

	response.OKWithMeta(c, toInterfaceSlice(audits), pg.Page, pg.PerPage, total)
}

// Get retrieves a single audit log entry by ID.
// GET /api/v1/accounts/:account_id/audit_logs/:id
func (h *AuditHandler) Get(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "account not identified")
		return
	}

	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil || id == 0 {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid audit log id")
		return
	}

	audit, svcErr := h.svc.GetByID(c.Request.Context(), uint(id))
	if svcErr != nil {
		applogger.L().Errorf("AuditHandler.Get id=%d: %v", id, svcErr)
		handleServiceError(c, svcErr)
		return
	}

	response.OK(c, audit)
}

// RegisterAuditRoutes registers audit log routes on a gin.RouterGroup.
func RegisterAuditRoutes(rg *gin.RouterGroup, h *AuditHandler) {
	audits := rg.Group("/audit_logs")
	{
		audits.GET("/", h.List)
		audits.GET("/:id", h.Get)
	}
}