package utilities

import (
	"context"
	"fmt"
	"strconv"

	"github.com/hashicorp/terraform-plugin-framework/diag"
	"github.com/hashicorp/terraform-plugin-framework/types"
	"github.com/hashicorp/terraform-plugin-log/tflog"
	"repository.basistech.ru/BASIS/decort-golang-sdk/pkg/cloudbroker/k8ci"
	"repository.basistech.ru/BASIS/terraform-provider-dynamix/internal/client"
	"repository.basistech.ru/BASIS/terraform-provider-dynamix/internal/service/cloudbroker/k8ci/models"
	"repository.basistech.ru/BASIS/terraform-provider-dynamix/internal/status"
)

func CreateRequestResourceK8CI(ctx context.Context, plan *models.ResourceK8CIModel) (k8ci.CreateRequest, diag.Diagnostics) {
	tflog.Info(ctx, "Start CreateRequestResourceK8CI", map[string]any{
		"name": plan.Name.ValueString(),
	})

	// set up required parameters in resource group create request
	createReq := k8ci.CreateRequest{
		Name:           plan.Name.ValueString(),
		Version:        plan.Version.ValueString(),
		MasterDriver:   plan.MasterDriver.ValueString(),
		WorkerDriver:   plan.WorkerDriver.ValueString(),
		MaxMasterCount: uint64(plan.MaxMasterCount.ValueInt64()),
		MaxWorkerCount: uint64(plan.MaxWorkerCount.ValueInt64()),
		MasterImageID:  uint64(plan.MasterImageId.ValueInt64()),
		WorkerImageID:  uint64(plan.WorkerImageId.ValueInt64()),
	}

	networkPlugins := make([]string, 0, len(plan.NetworkPlugins.Elements()))
	for _, plugin := range plan.NetworkPlugins.Elements() {
		networkPlugins = append(networkPlugins, plugin.(types.String).ValueString())
	}
	createReq.NetworkPlugins = networkPlugins

	if !plan.Description.IsNull() {
		createReq.Description = plan.Description.ValueString()
	}

	if !plan.SharedWith.IsNull() {
		sharedWith := make([]uint64, 0, len(plan.SharedWith.Elements()))
		for _, shared := range plan.SharedWith.Elements() {
			sharedWith = append(sharedWith, uint64(shared.(types.Int64).ValueInt64()))
		}
		createReq.SharedWith = sharedWith
	}

	return createReq, nil
}

func K8CIResourceEnableDisable(ctx context.Context, plan *models.ResourceK8CIModel, c *client.Client) diag.Diagnostics {
	tflog.Info(ctx, "EnableDisable k8ci with ID", map[string]any{"k8ci_id": plan.Id.ValueString()})
	diags := diag.Diagnostics{}
	k8ciid, err := strconv.ParseUint(plan.Id.ValueString(), 10, 64)
	if err != nil {
		diags.AddError("Cannot parsed ID k8ci from state", err.Error())
		return diags
	}
	if plan.Enabled.IsNull() || plan.Enabled.ValueBool() {
		tflog.Info(ctx, "Enable k8ci with ID", map[string]any{"k8ci_id": plan.Id.ValueString()})
		_, err := c.CloudBroker().K8CI().Enable(ctx, k8ci.EnableRequest{K8CIID: k8ciid})
		if err != nil {
			diags.AddError("K8CIResourceEnableDisable: error to enable k8ci", err.Error())
			return diags
		}
	} else {
		tflog.Info(ctx, "Disable k8ci with ID", map[string]any{"k8ci_id": plan.Id.ValueString()})
		_, err := c.CloudBroker().K8CI().Disable(ctx, k8ci.DisableRequest{K8CIID: k8ciid})
		if err != nil {
			diags.AddError("K8CIResourceEnableDisable: error to disable k8ci", err.Error())
			return diags
		}
	}
	return diags
}

func K8CIResourceCheckPresence(ctx context.Context, plan *models.ResourceK8CIModel, c *client.Client) (*k8ci.RecordK8CI, diag.Diagnostics) {
	tflog.Info(ctx, fmt.Sprintf("K8CIResourceCheckPresence: Get info about k8ci with ID - %v", plan.Id.ValueString()))

	diags := diag.Diagnostics{}

	k8ciid, err := strconv.ParseUint(plan.Id.ValueString(), 10, 64)
	if err != nil {
		diags.AddError("Cannot parsed ID k8ci from state", err.Error())
		return nil, diags
	}

	recordK8ci, err := c.CloudBroker().K8CI().Get(ctx, k8ci.GetRequest{K8CIID: k8ciid})
	if err != nil {
		diags.AddError(fmt.Sprintf("Cannot get info about k8ci with ID %v", k8ciid), err.Error())
		return nil, diags
	}

	tflog.Info(ctx, "K8CIResourceCheckPresence: response from CloudBroker().K8CI().Get", map[string]any{"k8ci_id": k8ciid, "response": recordK8ci})

	return recordK8ci, nil
}

func K8CIReadStatus(ctx context.Context, plan *models.ResourceK8CIModel, c *client.Client) diag.Diagnostics {
	tflog.Info(ctx, "Read status k8ci with ID", map[string]any{"k8ci_id": plan.Id.ValueString()})

	diags := diag.Diagnostics{}

	k8ciid, err := strconv.ParseUint(plan.Id.ValueString(), 10, 64)
	if err != nil {
		diags.AddError("Cannot parsed ID k8ci from state", err.Error())
		return diags
	}

	k8ciItem, err := c.CloudBroker().K8CI().Get(ctx, k8ci.GetRequest{K8CIID: k8ciid})
	if err != nil {
		diags.AddError(fmt.Sprintf("Cannot get info about k8ci with ID %v", k8ciItem), err.Error())
		return diags
	}

	switch k8ciItem.Status {
	case status.Modeled:
		diags.AddError("Error:", fmt.Sprintf("The k8ci is in status: %s, please, contact support for more information", k8ciItem.Status))
		return diags
	case status.Deleted:
		if plan.Restore.ValueBool() || plan.Restore.IsNull() {
			diags = K8CIRestore(ctx, plan, c)
			if diags.HasError() {
				tflog.Error(ctx, "Error restore K8CI", map[string]any{"k8ci_id": plan.Id.ValueString()})
				return diags
			}
		} else {
			diags.AddError("k8ci in status Deleted:", "please clean state, or restore k8ci")
			return diags
		}
		diags = K8CIResourceEnableDisable(ctx, plan, c)
		if diags.HasError() {
			tflog.Error(ctx, "Error enable/disable k8ci", map[string]any{"k8ci_id": plan.Id.ValueString()})
			return diags
		}
	case status.Destroying:
		diags.AddError("Error:", fmt.Sprintf("The k8ci is in progress with status: %s", k8ciItem.Status))
		return diags
	case status.Destroyed:
		diags.AddError("Error:", "The resource cannot be updated because it has been destroyed")
		return diags
	}

	tflog.Info(ctx, "Read status k8ci successfully", map[string]any{"k8ci_id": plan.Id.ValueString()})
	return diags
}

func K8CIRestore(ctx context.Context, plan *models.ResourceK8CIModel, c *client.Client) diag.Diagnostics {
	tflog.Info(ctx, "Restore k8ci with ID", map[string]any{"k8ci_id": plan.Id.ValueString()})

	diags := diag.Diagnostics{}

	k8ciid, err := strconv.ParseUint(plan.Id.ValueString(), 10, 64)
	if err != nil {
		diags.AddError("Cannot parsed ID k8ci from state", err.Error())
		return diags
	}

	_, err = c.CloudBroker().K8CI().Restore(ctx, k8ci.RestoreRequest{K8CIID: k8ciid})
	if err != nil {
		diags.AddError(fmt.Sprintf("Cannot restore k8ci with ID - %s", plan.Id.ValueString()), err.Error())
		return diags
	}

	tflog.Info(ctx, "Restore k8ci successfully", map[string]any{"k8ci_id": plan.Id.ValueString()})
	return diags
}

func K8CIIUpdateVarChecks(plan *models.ResourceK8CIModel, state *models.ResourceK8CIModel) diag.Diagnostics {

	diags := diag.Diagnostics{}

	if !plan.Name.Equal(state.Name) {
		diags.AddError(
			"Update resourceK8CI: Invalid input Name",
			fmt.Sprintf("block Name must not be changed for resource with k8ci_id %s", plan.Id.ValueString()),
		)
		return diags
	}

	if !plan.Version.Equal(state.Version) {
		diags.AddError(
			"Update resourceK8CI: Invalid input Version",
			fmt.Sprintf("block Version must not be changed for resource with k8ci_id %s", plan.Id.ValueString()),
		)
		return diags
	}

	if !plan.MasterDriver.Equal(state.MasterDriver) {
		diags.AddError(
			"Update resourceK8CI: Invalid MasterDriver",
			fmt.Sprintf("block MasterDriver must not be changed for resource with k8ci_id %s", plan.Id.ValueString()),
		)
		return diags
	}

	if !plan.MasterImageId.Equal(state.MasterImageId) {
		diags.AddError(
			"Update resourceK8CI: Invalid MasterImageId",
			fmt.Sprintf("block MasterImageId must not be changed for resource with k8ci_id %s", plan.Id.ValueString()),
		)
		return diags
	}

	if !plan.MaxMasterCount.Equal(state.MaxMasterCount) {
		diags.AddError(
			"Update resourceK8CI: Invalid MaxMasterCount",
			fmt.Sprintf("block MaxMasterCount must not be changed for resource with k8ci_id %s", plan.Id.ValueString()),
		)
		return diags
	}

	if !plan.MaxWorkerCount.Equal(state.MaxWorkerCount) {
		diags.AddError(
			"Update resourceK8CI: Invalid MaxWorkerCount",
			fmt.Sprintf("block MaxWorkerCount must not be changed for resource with k8ci_id %s", plan.Id.ValueString()),
		)
		return diags
	}

	if !plan.NetworkPlugins.Equal(state.NetworkPlugins) {
		diags.AddError(
			"Update resourceK8CI: Invalid NetworkPlugins",
			fmt.Sprintf("block NetworkPlugins must not be changed for resource with k8ci_id %s", plan.Id.ValueString()),
		)
		return diags
	}

	if !plan.WorkerDriver.Equal(state.WorkerDriver) {
		diags.AddError(
			"Update resourceK8CI: Invalid WorkerDriver",
			fmt.Sprintf("block WorkerDriver must not be changed for resource with k8ci_id %s", plan.Id.ValueString()),
		)
		return diags
	}

	if !plan.WorkerImageId.Equal(state.WorkerImageId) {
		diags.AddError(
			"Update resourceK8CI: Invalid WorkerImageId",
			fmt.Sprintf("block WorkerImageId must not be changed for resource with k8ci_id %s", plan.Id.ValueString()),
		)
		return diags
	}

	return nil
}

func K8CISharedWithUpdate(ctx context.Context, plan *models.ResourceK8CIModel, state *models.ResourceK8CIModel, c *client.Client) diag.Diagnostics {
	diags := diag.Diagnostics{}

	k8ciid, err := strconv.ParseUint(state.Id.ValueString(), 10, 64)
	if err != nil {
		diags.AddError("K8CISharedWithUpdate: cannot parsed ID k8ci from state", err.Error())
		return diags
	}

	addSet, removeSet := difference(state.SharedWith, plan.SharedWith)

	for _, account := range addSet {
		accountId := uint64(account.(types.Int64).ValueInt64())
		tflog.Info(ctx, fmt.Sprintf("K8CISharedWithUpdate: Start add account with ID - %d to sharedWith access list to k8ci with ID - %d", accountId, k8ciid))
		req := k8ci.AccessAddRequest{
			K8CIID:    k8ciid,
			AccountId: accountId,
		}
		res, err := c.CloudBroker().K8CI().AccessAdd(ctx, req)
		tflog.Info(ctx, "K8CISharedWithUpdate: response from CloudBroker().K8CI().AccessAdd", map[string]any{"k8ci_id": plan.Id.ValueString(), "response": res})
		if err != nil {
			diags.AddError(fmt.Sprintf("K8CISharedWithUpdate: Cannot add account with ID - %d", accountId), err.Error())
		}
	}

	if diags.HasError() {
		tflog.Error(ctx, "K8CISharedWithUpdate: Errors occurred while managing add accounts")
		return diags
	}

	for _, account := range removeSet {
		accountId := uint64(account.(types.Int64).ValueInt64())
		tflog.Info(ctx, fmt.Sprintf("K8CISharedWithUpdate: Start remove account with ID - %d from sharedWith access list to k8ci with ID - %d", accountId, k8ciid))
		req := k8ci.AccessRemoveRequest{
			K8CIID:    k8ciid,
			AccountId: accountId,
		}
		res, err := c.CloudBroker().K8CI().AccessRemove(ctx, req)
		tflog.Info(ctx, "K8CISharedWithUpdate: response from CloudBroker().K8CI().AccessRemove", map[string]any{"k8ci_id": plan.Id.ValueString(), "response": res})
		if err != nil {
			diags.AddError(fmt.Sprintf("K8CISharedWithUpdate: Cannot remove account with ID - %d", accountId), err.Error())
		}
	}

	if diags.HasError() {
		tflog.Error(ctx, "K8CISharedWithUpdate: Errors occurred while managing remove accounts")
		return diags
	}

	tflog.Info(ctx, "K8CISharedWithUpdate: sharedWith access list is successfully update", map[string]any{"k8ci_id": k8ciid})
	return nil
}

// difference returns lists added and removed values
func difference(oldSet, newSet types.List) (added, removed []any) {
	oldMap := make(map[interface{}]struct{})
	newMap := make(map[interface{}]struct{})

	for _, elem := range oldSet.Elements() {
		oldMap[elem] = struct{}{}
	}

	for _, elem := range newSet.Elements() {
		newMap[elem] = struct{}{}
	}

	for elem := range newMap {
		if _, found := oldMap[elem]; !found {
			added = append(added, elem)
		}
	}

	for elem := range oldMap {
		if _, found := newMap[elem]; !found {
			removed = append(removed, elem)
		}
	}

	return
}