package handler

import (
	"database/sql"
	"errors"
	"fmt"
	"net/http"
	"strconv"
	"time"
	"vctp/db/queries"
	models "vctp/server/models"
)

// VmMoveEvent records a VM move CloudEvent as an update.
// @Summary Record VM move event (deprecated)
// @Description Deprecated: Parses a VM move CloudEvent and creates an update record.
// @Tags events
// @Deprecated
// @Accept json
// @Produce json
// @Param event body models.CloudEventReceived true "CloudEvent payload"
// @Success 200 {object} models.StatusMessageResponse "Move event processed"
// @Failure 400 {object} models.ErrorResponse "Invalid request"
// @Failure 500 {object} models.ErrorResponse "Server error"
// @Router /api/event/vm/move [post]
func (h *Handler) VmMoveEvent(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		writeJSONError(w, http.StatusMethodNotAllowed, "method not allowed")
		return
	}

	if h.denyLegacyAPI(w, "/api/event/vm/move") {
		return
	}

	params := queries.CreateUpdateParams{}
	var unixTimestamp int64

	ctx, cancel := withRequestTimeout(r, defaultRequestTimeout)
	defer cancel()

	var event models.CloudEventReceived
	if err := decodeJSONBody(w, r, &event); err != nil {
		h.Logger.Error("unable to unmarshal json", "error", err)
		writeJSONError(w, http.StatusBadRequest, fmt.Sprintf("Unable to unmarshal JSON in request body: '%s'", err))
		return
	} else {
		h.Logger.Debug("successfully decoded JSON")
		//prettyPrint(event)
	}

	if event.CloudEvent.Data.OldParent == nil || event.CloudEvent.Data.NewParent == nil {
		h.Logger.Error("No resource pool data found in cloud event")
		prettyPrint(event)
		writeJSONError(w, http.StatusBadRequest, "CloudEvent missing resource pool data")
		return
	}

	h.Logger.Debug("Checking inventory table for VM record")
	invParams := queries.GetInventoryVmIdParams{
		VmId:           sql.NullString{String: event.CloudEvent.Data.VM.VM.Value, Valid: event.CloudEvent.Data.VM.VM.Value != ""},
		DatacenterName: sql.NullString{String: event.CloudEvent.Data.Datacenter.Name, Valid: event.CloudEvent.Data.Datacenter.Name != ""},
	}
	invResult, err := h.Database.Queries().GetInventoryVmId(ctx, invParams)

	if err != nil {
		// If a VM is being moved it must exist, so lets add an inventory record for this VM
		h.Logger.Error("unable to find existing inventory record for this VM", "error", err)
		if errors.Is(err, sql.ErrNoRows) {
			// Add a record to the inventory table for this VM
			h.Logger.Info("Received VM modify event for a VM not currently in the inventory. Adding to inventory")

			iid, err2 := h.AddVmToInventory(event, ctx, unixTimestamp)
			if err2 != nil {
				h.Logger.Error("Received error adding VM to inventory", "error", err2)
				writeJSONError(w, http.StatusInternalServerError, fmt.Sprintf("Valid request but experienced error adding vm id '%s' in datacenter name '%s' to inventory table : %s",
					event.CloudEvent.Data.VM.VM.Value, event.CloudEvent.Data.Datacenter.Name, err2))
				return
			}

			if iid > 0 {
				params.InventoryId = sql.NullInt64{Int64: iid, Valid: iid > 0}
			} else {
				h.Logger.Error("Received zero for inventory id when adding VM to inventory")
				writeJSONError(w, http.StatusInternalServerError, fmt.Sprintf("Valid request but received zero result when adding vm id '%s' in datacenter name '%s' to inventory table",
					event.CloudEvent.Data.VM.VM.Value, event.CloudEvent.Data.Datacenter.Name))
				return
			}
		}
	} else {
		params.InventoryId = sql.NullInt64{Int64: invResult.Iid, Valid: invResult.Iid > 0}
	}

	// Parse the datetime string to a time.Time object
	eventTime, err := time.Parse(time.RFC3339, event.CloudEvent.Data.CreatedTime)
	if err != nil {
		h.Logger.Warn("unable to convert cloud event time to timestamp", "error", err)
		unixTimestamp = time.Now().Unix()
	} else {
		// Convert to Unix timestamp
		unixTimestamp = eventTime.Unix()
	}

	// populate other parameters for the Update database record
	params.NewResourcePool = sql.NullString{String: event.CloudEvent.Data.NewParent.Name, Valid: event.CloudEvent.Data.NewParent.Name != ""}
	params.UpdateType = "move"
	params.EventId = sql.NullString{String: event.CloudEvent.ID, Valid: event.CloudEvent.ID != ""}
	params.EventKey = sql.NullString{String: strconv.Itoa(event.CloudEvent.Data.Key), Valid: event.CloudEvent.Data.Key > 0}
	params.UpdateTime = sql.NullInt64{Int64: unixTimestamp, Valid: unixTimestamp > 0}
	params.UserName = sql.NullString{String: event.CloudEvent.Data.UserName, Valid: event.CloudEvent.Data.UserName != ""}

	// Create the Update database record
	result, err := h.Database.Queries().CreateUpdate(ctx, params)
	if err != nil {
		h.Logger.Error("unable to perform database insert", "error", err)
		writeJSONError(w, http.StatusInternalServerError, fmt.Sprintf("Unable to insert move event into database: '%s'", err))
		return

	} else {
		h.Logger.Debug("created database record", "insert_result", result)
		writeJSONOKMessage(w, "Successfully processed move event")
		return
	}
}