package handler

import (
	"context"
	"database/sql"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"strconv"
	"time"
	"vctp/db/queries"
	models "vctp/server/models"
)

func (h *Handler) VmMoveEvent(w http.ResponseWriter, r *http.Request) {
	params := queries.CreateUpdateParams{}
	var unixTimestamp int64

	ctx := context.Background()

	reqBody, err := io.ReadAll(r.Body)
	if err != nil {
		h.Logger.Error("Invalid data received", "error", err)
		fmt.Fprintf(w, "Invalid data received")
		w.WriteHeader(http.StatusInternalServerError)
		return
	} else {
		//h.Logger.Debug("received input data", "length", len(reqBody))
	}

	// Decode the JSON body into CloudEventReceived struct
	var event models.CloudEventReceived
	if err := json.Unmarshal(reqBody, &event); err != nil {
		h.Logger.Error("unable to unmarshal json", "error", err)
		prettyPrint(reqBody)
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusInternalServerError)
		json.NewEncoder(w).Encode(map[string]string{
			"status":  "ERROR",
			"message": 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)
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusBadRequest)
		json.NewEncoder(w).Encode(map[string]string{
			"status":  "ERROR",
			"message": fmt.Sprintf("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 {
		h.Logger.Error("unable to find existing inventory record for this VM", "error", err)
		// TODO - how to handle?
	} 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)
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusInternalServerError)
		json.NewEncoder(w).Encode(map[string]string{
			"status":  "ERROR",
			"message": fmt.Sprintf("Unable to insert move event into database: '%s'", err),
		})
		return

	} else {
		h.Logger.Debug("created database record", "insert_result", result)
		w.WriteHeader(http.StatusOK)
		//fmt.Fprintf(w, "Processed update event: %v\n", result)
		json.NewEncoder(w).Encode(map[string]string{
			"status":  "OK",
			"message": fmt.Sprintf("Successfully processed move event"),
		})
		return
	}
}