package disks

import (
	"context"
	"fmt"

	"github.com/hashicorp/terraform-plugin-framework-timeouts/resource/timeouts"
	"github.com/hashicorp/terraform-plugin-framework/path"
	"github.com/hashicorp/terraform-plugin-framework/resource"
	"github.com/hashicorp/terraform-plugin-framework/resource/schema"
	"github.com/hashicorp/terraform-plugin-log/tflog"
	decort "repository.basistech.ru/BASIS/decort-golang-sdk"
	"repository.basistech.ru/BASIS/decort-golang-sdk/pkg/cloudapi/disks"
	"repository.basistech.ru/BASIS/terraform-provider-dynamix/internal/client"
	"repository.basistech.ru/BASIS/terraform-provider-dynamix/internal/constants"
	"repository.basistech.ru/BASIS/terraform-provider-dynamix/internal/service/cloudapi/disks/flattens"
	"repository.basistech.ru/BASIS/terraform-provider-dynamix/internal/service/cloudapi/disks/models"
	"repository.basistech.ru/BASIS/terraform-provider-dynamix/internal/service/cloudapi/disks/schemas"
	"repository.basistech.ru/BASIS/terraform-provider-dynamix/internal/service/cloudapi/disks/utilities"
)

// Ensure the implementation satisfies the expected interfaces.
var (
	_ resource.Resource                = &resourceDiskReplication{}
	_ resource.ResourceWithImportState = &resourceDiskReplication{}
)

// NewResourceDisk is a helper function to simplify the provider implementation.
func NewResourceDiskReplications() resource.Resource {
	return &resourceDiskReplication{}
}

// resourceDiskReplication is the resource implementation.
type resourceDiskReplication struct {
	client *decort.DecortClient
}

// Create creates the resource and sets the initial Terraform state.
func (r *resourceDiskReplication) Create(ctx context.Context, req resource.CreateRequest, resp *resource.CreateResponse) {
	// Get plan to create resource group
	var plan models.ResourceRecordDiskReplicationModel
	resp.Diagnostics.Append(req.Plan.Get(ctx, &plan)...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Create resourceDiskReplication: Error receiving the plan")
		return
	}

	tflog.Info(ctx, "Create resourceDiskReplication: got plan successfully")
	tflog.Info(ctx, "Create resourceDiskReplication: start creating")

	// Set timeouts
	createTimeout, diags := plan.Timeouts.Create(ctx, constants.Timeout600s)
	resp.Diagnostics.Append(diags...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Create resourceDiskReplication: Error set timeout")
		return
	}
	tflog.Info(ctx, "Create resourceDiskReplication: set timeouts successfully")

	ctx, cancel := context.WithTimeout(ctx, createTimeout)
	defer cancel()

	// Check if input values are valid in the platform
	tflog.Info(ctx, "Create resourceDiskReplication: starting input checks")
	resp.Diagnostics.Append(resourceDiskReplicationInputChecks(ctx, &plan, r.client)...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Create resourceDiskReplication: Error input checks")
		return
	}
	tflog.Info(ctx, "Create resourceDiskReplication: input checks successful")

	reqCreate := disks.ReplicateRequest{
		DiskID:   uint64(plan.DiskId.ValueInt64()),
		Name:     plan.Name.ValueString(),
		SepID:    uint64(plan.SepID.ValueInt64()),
		PoolName: plan.PoolName.ValueString(),
	}

	diskReplicaId, err := r.client.CloudAPI().Disks().Replicate(ctx, reqCreate)
	if err != nil {
		resp.Diagnostics.AddError(
			"Create resourceDiskReplication: unable to replicate disk",
			err.Error(),
		)
		return
	}

	tflog.Info(ctx, fmt.Sprintf("resourceDiskReplicationCreate: create replica complete for disk with ID: %d", plan.DiskId.ValueInt64()))

	start := plan.Start.ValueBool()
	ok := !(plan.Start.IsNull() || plan.Start.IsUnknown())

	if ok && !start {
		tflog.Info(ctx, fmt.Sprintf("resourceDiskReplicationCreate: replication between disk with ID: %d and replica with ID: %d, try to stop", uint64(plan.DiskId.ValueInt64()), diskReplicaId))
		reqStop := disks.ReplicationStopRequest{
			DiskID: uint64(plan.DiskId.ValueInt64()),
		}
		_, err = r.client.CloudAPI().Disks().ReplicationStop(ctx, reqStop)
		if err != nil {
			resp.Diagnostics.AddError(
				fmt.Sprintf("resourceDiskReplicationCreate: replication between disk with ID: %d and replica with ID: %d, stoped", uint64(plan.DiskId.ValueInt64()), diskReplicaId),
				err.Error(),
			)
			return
		}
	}

	// Map response body to schema and populate Computed attribute values
	resp.Diagnostics.Append(flattens.DiskReplicationResource(ctx, &plan, r.client)...)
	if resp.Diagnostics.HasError() {
		return
	}

	// Set state to fully populated data
	resp.Diagnostics.Append(resp.State.Set(ctx, plan)...)
	if resp.Diagnostics.HasError() {
		return
	}
}

// Read refreshes the Terraform state with the latest data.
func (r *resourceDiskReplication) Read(ctx context.Context, req resource.ReadRequest, resp *resource.ReadResponse) {
	// Get current state
	var state models.ResourceRecordDiskReplicationModel
	resp.Diagnostics.Append(req.State.Get(ctx, &state)...)

	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Read resourceDiskReplication: Error get state")
		return
	}
	tflog.Info(ctx, "Read resourceDiskReplication: got state successfully")

	// Set timeouts
	readTimeout, diags := state.Timeouts.Read(ctx, constants.Timeout300s)
	resp.Diagnostics.Append(diags...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Read resourceDiskReplication: Error set timeout")
		return
	}
	tflog.Info(ctx, "Read resourceDiskReplication: set timeouts successfully", map[string]any{
		"disk_id":     state.DiskId.ValueInt64(),
		"readTimeout": readTimeout})

	ctx, cancel := context.WithTimeout(ctx, readTimeout)
	defer cancel()

	// read status
	resp.Diagnostics.Append(utilities.ReplicationDiskReadStatus(ctx, &state, r.client)...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Read resourceDiskReplication: Error reading disk status")
		return
	}

	// Overwrite items with refreshed state
	resp.Diagnostics.Append(flattens.DiskReplicationResource(ctx, &state, r.client)...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Read resourceDiskReplication: Error flatten disk")
		return
	}

	// Set refreshed state
	resp.Diagnostics.Append(resp.State.Set(ctx, &state)...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Read resourceDiskReplication: Error set state")
		return
	}
	tflog.Info(ctx, "End read resourceDiskReplication")
}

// Update updates the resource and sets the updated Terraform state on success.
func (r *resourceDiskReplication) Update(ctx context.Context, req resource.UpdateRequest, resp *resource.UpdateResponse) {
	// Retrieve values from plan
	var plan models.ResourceRecordDiskReplicationModel
	resp.Diagnostics.Append(req.Plan.Get(ctx, &plan)...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Update resourceDiskReplication: Error receiving the plan")
		return
	}
	tflog.Info(ctx, "Update resourceDiskReplication: got plan successfully", map[string]any{"disk_id": plan.DiskId.ValueInt64()})

	// Retrieve values from state
	var state models.ResourceRecordDiskReplicationModel
	resp.Diagnostics.Append(req.State.Get(ctx, &state)...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Update resourceDiskReplication: Error receiving the state")
		return
	}
	tflog.Info(ctx, "Update resourceDiskReplication: got state successfully", map[string]any{"disk_id": state.DiskId.ValueInt64()})

	// Set timeouts
	updateTimeout, diags := plan.Timeouts.Update(ctx, constants.Timeout300s)
	resp.Diagnostics.Append(diags...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Update resourceDiskReplication: Error set timeout")
		return
	}
	tflog.Info(ctx, "Update resourceDiskReplication: set timeouts successfully", map[string]any{
		"disk_id":       state.DiskId.ValueInt64(),
		"updateTimeout": updateTimeout})

	ctx, cancel := context.WithTimeout(ctx, updateTimeout)
	defer cancel()

	// Checking if inputs are valid
	tflog.Info(ctx, "Update resourceDiskReplication: starting input checks", map[string]any{"disk_id": plan.DiskId.ValueInt64()})
	resp.Diagnostics.Append(resourceDiskReplicationInputChecks(ctx, &plan, r.client)...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Update resourceDiskReplication: Error input checks")
		return
	}
	tflog.Info(ctx, "Update resourceDiskReplication: input checks successful", map[string]any{"disk_id": state.DiskId.ValueInt64()})

	if !plan.Start.Equal(state.Start) {
		resp.Diagnostics.Append(utilities.UtilityDiskReplicationUpdateStartStop(ctx, &state, r.client)...)
		if resp.Diagnostics.HasError() {
			tflog.Error(ctx, "Update resourceDiskReplication: error with UtilityDiskReplicationUpdateStartStop")
			return
		}
	}

	if !plan.Pause.Equal(state.Pause) {
		resp.Diagnostics.Append(utilities.UtilityDiskReplicationUpdatePause(ctx, &state, r.client)...)
		if resp.Diagnostics.HasError() {
			tflog.Error(ctx, "Update resourceDiskReplication: error with UtilityDiskReplicationUpdatePause")
			return
		}
	}

	if !plan.Reverse.Equal(state.Reverse) {
		resp.Diagnostics.Append(utilities.UtilityDiskReplicationUpdateReverse(ctx, &state, r.client)...)
		if resp.Diagnostics.HasError() {
			tflog.Error(ctx, "Update resourceDiskReplication: error with UtilityDiskReplicationUpdatePause")
			return
		}
	}

	tflog.Info(ctx, "Update resourceDiskReplication: disk update is completed", map[string]any{"disk_id": plan.DiskId.ValueInt64()})

	// Overwrite items with refreshed state
	resp.Diagnostics.Append(flattens.DiskReplicationResource(ctx, &state, r.client)...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Read resourceDiskReplication: Error flatten disk")
		return
	}

	// Set refreshed state
	resp.Diagnostics.Append(resp.State.Set(ctx, &state)...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Read resourceDiskReplication: Error set state")
		return
	}
	tflog.Info(ctx, "End read resourceDiskReplication")
}

// Delete deletes the resource and removes the Terraform state on success.
func (r *resourceDiskReplication) Delete(ctx context.Context, req resource.DeleteRequest, resp *resource.DeleteResponse) {
	// Get current state
	var state models.ResourceRecordDiskReplicationModel
	resp.Diagnostics.Append(req.State.Get(ctx, &state)...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Delete resourceDiskReplication: Error get state")
		return
	}
	tflog.Info(ctx, "Delete resourceDiskReplication: got state successfully", map[string]any{"disk_id": state.DiskId.ValueInt64()})

	// Set timeouts
	deleteTimeout, diags := state.Timeouts.Delete(ctx, constants.Timeout300s)
	resp.Diagnostics.Append(diags...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Delete resourceDiskReplication: Error set timeout")
		return
	}
	tflog.Info(ctx, "Delete resourceDiskReplication: set timeouts successfully", map[string]any{
		"disk_id":       state.DiskId.ValueInt64(),
		"deleteTimeout": deleteTimeout})

	ctx, cancel := context.WithTimeout(ctx, deleteTimeout)
	defer cancel()

	// Delete existing resource group
	delReq := disks.DeleteRequest{
		DiskID:      uint64(state.DiskId.ValueInt64()),
		Detach:      state.Detach.ValueBool(),      // default false
		Permanently: state.Permanently.ValueBool(), // default false
	}

	if !state.Reason.IsNull() {
		delReq.Reason = state.Reason.ValueString()
	}

	tflog.Info(ctx, "Delete resourceDiskReplication: before call CloudAPI().Disks().Delete", map[string]any{"req": delReq})
	_, err := r.client.CloudAPI().Disks().Delete(ctx, delReq)
	if err != nil {
		resp.Diagnostics.AddError("Delete resourceDiskReplication: Error deleting disk with error: ", err.Error())
		return
	}

	tflog.Info(ctx, "End delete resourceDiskReplication", map[string]any{"disk_id": state.DiskId.ValueInt64()})
}

// Schema defines the schema for the resource.
func (r *resourceDiskReplication) Schema(ctx context.Context, _ resource.SchemaRequest, resp *resource.SchemaResponse) {
	resp.Schema = schema.Schema{
		Attributes: schemas.MakeSchemaResourceDiskReplication(),
		Blocks: map[string]schema.Block{
			"timeouts": timeouts.Block(ctx, timeouts.Opts{Create: true, Read: true, Update: true, Delete: true}),
		},
	}
}

// Metadata returns the resource type name.
func (r *resourceDiskReplication) Metadata(_ context.Context, req resource.MetadataRequest, resp *resource.MetadataResponse) {
	resp.TypeName = req.ProviderTypeName + "_disk_replication"
}

// Configure adds the provider configured client to the resource.
func (r *resourceDiskReplication) Configure(ctx context.Context, req resource.ConfigureRequest, resp *resource.ConfigureResponse) {
	tflog.Info(ctx, "Get Configure resourceDiskReplication")
	r.client = client.Resource(ctx, &req, resp)
	tflog.Info(ctx, "Getting Configure resourceDiskReplication successfully")
}

func (r *resourceDiskReplication) ImportState(ctx context.Context, req resource.ImportStateRequest, resp *resource.ImportStateResponse) {
	// Retrieve import ID and save to id attribute
	resource.ImportStatePassthroughID(ctx, path.Root("id"), req, resp)
}