package k8s

import (
	"context"
	"time"

	"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-framework/types"
	"github.com/hashicorp/terraform-plugin-log/tflog"
	"repository.basistech.ru/BASIS/decort-golang-sdk/pkg/cloudapi/k8s"
	"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/k8s/flattens"
	"repository.basistech.ru/BASIS/terraform-provider-dynamix/internal/service/cloudapi/k8s/models"
	"repository.basistech.ru/BASIS/terraform-provider-dynamix/internal/service/cloudapi/k8s/schemas"
	"repository.basistech.ru/BASIS/terraform-provider-dynamix/internal/service/cloudapi/k8s/utilities"
)

// Ensure the implementation satisfies the expected interfaces.
var (
	_ resource.Resource                = &resourceK8SCP{}
	_ resource.ResourceWithImportState = &resourceK8SCP{}
)

// NewResourceK8S_CP is a helper function to simplify the provider implementation.
func NewResourceK8SCP() resource.Resource {
	return &resourceK8SCP{}
}

// resourceK8S_CP is the resource implementation.
type resourceK8SCP struct {
	client *client.Client
}

// Create the resource and sets the initial Terraform state.
func (r *resourceK8SCP) Create(ctx context.Context, req resource.CreateRequest, resp *resource.CreateResponse) {
	var plan models.ResourceK8SCPModel

	// Get plan for create cluster
	resp.Diagnostics.Append(req.Plan.Get(ctx, &plan)...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Error receiving the plan")
		return
	}

	tflog.Info(ctx, "Start create k8s_cp cluster", map[string]any{"name": plan.Name.ValueString()})

	// Set timeouts
	createTimeout, diags := plan.Timeouts.Create(ctx, constants.Timeout30m)
	resp.Diagnostics.Append(diags...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Error set timeout")
		return
	}

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

	// Сhecking for values in the platform
	resp.Diagnostics.Append(utilities.CheckParamsExistenceCP(ctx, &plan, r.client)...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Error check input values")
		return
	}

	// Make request and get response
	task, err := r.client.CloudAPI().K8S().Create(ctx, utilities.CreateRequestResourceK8CP(ctx, &plan))
	if err != nil {
		tflog.Error(ctx, "Error response for create k8s_cp cluster")
		resp.Diagnostics.AddError("Unable to Create K8SCP", err.Error())
		return
	}

	// Check cluster and validated
	resp.Diagnostics.Append(utilities.CheckResourceK8SCPCreateAndDeleteWG(ctx, &plan, r.client, task)...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Error create k8s_cp cluster")
		return
	}

	// Map response body to schema
	resp.Diagnostics.Append(flattens.K8SCPResource(ctx, &plan, r.client)...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Error flatten k8s_cp cluster")
		return
	}

	// Set state to fully populated data
	resp.Diagnostics.Append(resp.State.Set(ctx, &plan)...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Error set state")
		return
	}
	tflog.Info(ctx, "End create k8s_cp cluster", map[string]any{"k8s_id": plan.K8SID.ValueInt64()})
}

// Read refreshes the Terraform state with the latest data.
func (r *resourceK8SCP) Read(ctx context.Context, req resource.ReadRequest, resp *resource.ReadResponse) {
	var state models.ResourceK8SCPModel

	// Get current state
	resp.Diagnostics.Append(req.State.Get(ctx, &state)...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Error get state")
		return
	}

	tflog.Info(ctx, "Start read k8s_cp cluster", map[string]any{"k8s_id": state.K8SID.ValueInt64()})

	// Set timeouts
	readTimeout, diags := state.Timeouts.Read(ctx, constants.Timeout600s)
	resp.Diagnostics.Append(diags...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Error set timeout")
		return
	}

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

	// Read status cluster and if it is necessary to restore it
	resp.Diagnostics.Append(utilities.K8SCPReadStatus(ctx, &state, r.client)...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Error read status or restore")
		return
	}

	// Overwrite items with refreshed state
	resp.Diagnostics.Append(flattens.K8SCPResource(ctx, &state, r.client)...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Error flatten k8s_cp cluster")
		return
	}

	// Set refreshed state
	resp.Diagnostics.Append(resp.State.Set(ctx, &state)...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Error set state")
		return
	}
	tflog.Info(ctx, "End read k8s_cp cluster", map[string]any{"k8s_id": state.K8SID.ValueInt64()})
}

// Update updates the resource and sets the updated Terraform state on success.
func (r *resourceK8SCP) Update(ctx context.Context, req resource.UpdateRequest, resp *resource.UpdateResponse) {
	var plan models.ResourceK8SCPModel
	var state models.ResourceK8SCPModel

	// Retrieve values from plan
	resp.Diagnostics.Append(req.Plan.Get(ctx, &plan)...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Error receiving the plan")
		return
	}

	// Retrieve values from state
	resp.Diagnostics.Append(req.State.Get(ctx, &state)...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Error receiving the state")
		return
	}

	tflog.Info(ctx, "Start update k8s_cp cluster", map[string]any{"k8s_id": state.K8SID.ValueInt64()})

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

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

	// Сhecking for values in the platform
	resp.Diagnostics.Append(utilities.CheckParamsExistenceCP(ctx, &plan, r.client)...)
	if resp.Diagnostics.HasError() {

		tflog.Error(ctx, "Error check input values")
		return
	}

	// Update Name or/and Description cluster
	if !plan.Name.Equal(state.Name) || !plan.Description.Equal(state.Description) {
		resp.Diagnostics.Append(utilities.K8SCPUpdateNameOrDescription(ctx, &plan, &state, r.client)...)
		if resp.Diagnostics.HasError() {
			tflog.Error(ctx, "Error update info")
			return
		}
	}

	// Update Enable/Disable cluster
	if !plan.Enabled.Equal(state.Enabled) {
		resp.Diagnostics.Append(utilities.K8SCPEnableDisable(ctx, &plan, r.client)...)
		if resp.Diagnostics.HasError() {
			tflog.Error(ctx, "Error Enable/Disable")
			return
		}
	}

	// Update Start/Stop cluster
	if !plan.Start.Equal(state.Start) {
		resp.Diagnostics.Append(utilities.K8SCPStartStop(ctx, &plan, r.client)...)
		if resp.Diagnostics.HasError() {
			tflog.Error(ctx, "Error Start/Stop")
			return
		}
	}

	// Delete master node from cluster
	if (plan.Num.ValueInt64() < state.Num.ValueInt64()) && (plan.Num.ValueInt64() != 0) {
		resp.Diagnostics.Append(utilities.K8SCPDeleteMaster(ctx, &plan, &state, r.client)...)
		if resp.Diagnostics.HasError() {
			tflog.Error(ctx, "Error Delete master node")
			return
		}
	}

	//Update LB params
	if (state.WithLB.IsNull() || state.WithLB.ValueBool()) && !plan.LBSysctlParams.Equal(state.LBSysctlParams) {
		resp.Diagnostics.Append(utilities.K8CPUpdateSysctlParams(ctx, &plan, &state, r.client)...)
		if resp.Diagnostics.HasError() {
			tflog.Error(ctx, "Error Update LB params")
			return
		}
	}

	// Map response body to schema
	resp.Diagnostics.Append(flattens.K8SCPResource(ctx, &plan, r.client)...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Error flatten k8s_cp cluster")
		return
	}

	// Set data last update
	plan.LastUpdated = types.StringValue(time.Now().Format(time.RFC850))

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

	tflog.Info(ctx, "End update k8s_cp cluster", map[string]any{"k8s_id": state.K8SID.ValueInt64()})
}

// Delete deletes the resource and removes the Terraform state on success.
func (r *resourceK8SCP) Delete(ctx context.Context, req resource.DeleteRequest, resp *resource.DeleteResponse) {
	// Get current state
	var state models.ResourceK8SCPModel
	resp.Diagnostics.Append(req.State.Get(ctx, &state)...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Error get state")
		return
	}

	tflog.Info(ctx, "Start delete k8s_cp cluster", map[string]any{"k8s_id": state.K8SID.ValueInt64()})

	// Set timeouts
	deleteTimeout, diags := state.Timeouts.Delete(ctx, constants.Timeout600s)
	resp.Diagnostics.Append(diags...)
	if resp.Diagnostics.HasError() {
		tflog.Error(ctx, "Error set timeout")
		return
	}

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

	var permanently bool
	if state.Permanently.IsNull() {
		permanently = true
	} else {
		permanently = state.Permanently.ValueBool()
	}

	// Delete existing k8s_cp cluster
	_, err := r.client.CloudAPI().K8S().Delete(ctx, k8s.DeleteRequest{K8SID: uint64(state.K8SID.ValueInt64()), Permanently: permanently})
	if err != nil {
		resp.Diagnostics.AddError("Error deleting k8s_cp cluster with error: ", err.Error())
		return
	}

	tflog.Info(ctx, "End delete k8s_cp cluster", map[string]any{"k8s_id": state.K8SID.ValueInt64()})
}

// Schema defines the schema for the resource.
func (r *resourceK8SCP) Schema(ctx context.Context, _ resource.SchemaRequest, resp *resource.SchemaResponse) {
	resp.Schema = schema.Schema{
		Attributes: schemas.MakeSchemaResourceK8SCP(),
		Blocks: map[string]schema.Block{
			"timeouts": timeouts.Block(ctx, timeouts.Opts{Create: true, Read: true, Update: true, Delete: true}),
		},
		Version: 1,
	}
}

// Metadata returns the resource type name.
func (r *resourceK8SCP) Metadata(_ context.Context, req resource.MetadataRequest, resp *resource.MetadataResponse) {
	resp.TypeName = req.ProviderTypeName + "_k8s_cp"
}

// Configure adds the provider configured client to the resource.
func (r *resourceK8SCP) Configure(ctx context.Context, req resource.ConfigureRequest, resp *resource.ConfigureResponse) {
	tflog.Info(ctx, "Get configure resource")
	r.client = client.Resource(ctx, &req, resp)
	tflog.Info(ctx, "Getting configure resource successfully")
}

func (r *resourceK8SCP) 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)
}