package handler

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

// VmCreate receives the CloudEvent for a VM creation
func (h *Handler) VmCreate(w http.ResponseWriter, r *http.Request) {
	var (
		unixTimestamp int64
		numVcpus      int32
		numRam        int32
	)

	reqBody, err := io.ReadAll(r.Body)
	if err != nil {
		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 vmModel struct
	var vm models.CloudEventReceived
	if err := json.Unmarshal(reqBody, &vm); err != nil {
		h.Logger.Error("unable to decode json", "error", err)
		http.Error(w, "Invalid JSON body", http.StatusBadRequest)
		return
	}

	// Convert vmModel to CreateInventoryParams using the utility function
	//var params queries.CreateInventoryParams
	//db.ConvertToSQLParams(&vm, &params)

	// Parse the datetime string to a time.Time object
	eventTime, err := time.Parse(time.RFC3339, vm.CloudEvent.Time)
	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()
	}

	// TODO - initiate govmomi query of source vcenter to discover related data
	vc := vcenter.New(h.Logger)
	vc.Login(vm.CloudEvent.Source)
	//vmObject, err := vc.FindVMByName(vm.CloudEvent.Data.VM.Name)
	vmObject, err := vc.FindVMByID(vm.CloudEvent.Data.VM.VM.Value)
	if err != nil {
		h.Logger.Error("Can't locate vm in vCenter", "vmID", vm.CloudEvent.Data.VM.VM.Value, "error", err)
	} else {
		//h.Logger.Debug("found VM", "object", vmObject)
		//prettyPrint(vmObject)

		// calculate VM properties we want to store
		numRam = vmObject.Vm.Config.Hardware.MemoryMB
		numVcpus = vmObject.Vm.Config.Hardware.NumCPU * vmObject.Vm.Config.Hardware.NumCoresPerSocket
	}
	vc.Logout()

	// Create an instance of CreateInventoryParams
	params := queries.CreateInventoryParams{
		Name:         vm.CloudEvent.Data.VM.Name,
		Vcenter:      vm.CloudEvent.Source,
		EventId:      sql.NullString{String: vm.CloudEvent.ID, Valid: vm.CloudEvent.ID != ""},
		EventKey:     sql.NullString{String: strconv.Itoa(vm.CloudEvent.Data.Key), Valid: strconv.Itoa(vm.CloudEvent.Data.Key) != ""},
		VmId:         sql.NullString{String: "VirtualMachine-" + vm.CloudEvent.Data.VM.VM.Value, Valid: vm.CloudEvent.Data.VM.VM.Value != ""},
		Datacenter:   sql.NullString{String: vmObject.Datacenter, Valid: vmObject.Datacenter != ""},
		CreationTime: sql.NullInt64{Int64: unixTimestamp, Valid: unixTimestamp > 0},
		InitialVcpus: sql.NullInt64{Int64: int64(numVcpus), Valid: numVcpus > 0},
		InitialRam:   sql.NullInt64{Int64: int64(numRam), Valid: numRam > 0},
	}

	h.Logger.Debug("database params", "params", params)

	// Insert the new inventory record into the database
	result, err := h.Database.Queries().CreateInventory(context.Background(), params)
	if err != nil {
		h.Logger.Error("unable to perform database insert", "error", err)
		w.WriteHeader(http.StatusInternalServerError)
		fmt.Fprintf(w, "Error : %v\n", err)
		return
	}

	h.Logger.Debug("received create request", "body", string(reqBody))
	w.WriteHeader(http.StatusOK)
	fmt.Fprintf(w, "Create Request : %v\n", result)
}

func prettyPrint(args ...interface{}) {
	var caller string

	timeNow := time.Now().Format("01-02-2006 15:04:05")
	prefix := fmt.Sprintf("[%s] %s -- ", "PrettyPrint", timeNow)
	_, fileName, fileLine, ok := runtime.Caller(1)

	if ok {
		caller = fmt.Sprintf("%s:%d", fileName, fileLine)
	} else {
		caller = ""
	}

	fmt.Printf("\n%s%s\n", prefix, caller)

	if len(args) == 2 {
		label := args[0]
		value := args[1]

		s, _ := json.MarshalIndent(value, "", "\t")
		fmt.Printf("%s%s: %s\n", prefix, label, string(s))
	} else {
		s, _ := json.MarshalIndent(args, "", "\t")
		fmt.Printf("%s%s\n", prefix, string(s))
	}
}