package sqlserverflexbeta

import (
	"context"
	"fmt"
	"net/http"

	"github.com/hashicorp/terraform-plugin-framework/datasource"
	"github.com/hashicorp/terraform-plugin-framework/types"
	"github.com/hashicorp/terraform-plugin-log/tflog"
	"github.com/stackitcloud/stackit-sdk-go/core/config"
	"tf-provider.git.onstackit.cloud/stackit-dev-tools/terraform-provider-stackitprivatepreview/stackit/internal/conversion"
	"tf-provider.git.onstackit.cloud/stackit-dev-tools/terraform-provider-stackitprivatepreview/stackit/internal/core"
	"tf-provider.git.onstackit.cloud/stackit-dev-tools/terraform-provider-stackitprivatepreview/stackit/internal/utils"

	sqlserverflexbetaPkg "tf-provider.git.onstackit.cloud/stackit-dev-tools/terraform-provider-stackitprivatepreview/pkg_gen/sqlserverflexbeta"

	sqlserverflexbetaGen "tf-provider.git.onstackit.cloud/stackit-dev-tools/terraform-provider-stackitprivatepreview/stackit/internal/services/sqlserverflexbeta/instance/datasources_gen"
)

var _ datasource.DataSource = (*instanceDataSource)(nil)

const errorPrefix = "[Sqlserverflexbeta - Instance]"

func NewInstanceDataSource() datasource.DataSource {
	return &instanceDataSource{}
}

// dataSourceModel maps the data source schema data.
type dataSourceModel struct {
	sqlserverflexbetaGen.InstanceModel
	TerraformID types.String `tfsdk:"id"`
}

type instanceDataSource struct {
	client       *sqlserverflexbetaPkg.APIClient
	providerData core.ProviderData
}

func (d *instanceDataSource) Metadata(
	_ context.Context,
	req datasource.MetadataRequest,
	resp *datasource.MetadataResponse,
) {
	resp.TypeName = req.ProviderTypeName + "_sqlserverflexbeta_instance"
}

func (d *instanceDataSource) Schema(ctx context.Context, _ datasource.SchemaRequest, resp *datasource.SchemaResponse) {
	resp.Schema = sqlserverflexbetaGen.InstanceDataSourceSchema(ctx)
}

// Configure adds the provider configured client to the data source.
func (d *instanceDataSource) Configure(
	ctx context.Context,
	req datasource.ConfigureRequest,
	resp *datasource.ConfigureResponse,
) {
	var ok bool
	d.providerData, ok = conversion.ParseProviderData(ctx, req.ProviderData, &resp.Diagnostics)
	if !ok {
		return
	}

	apiClientConfigOptions := []config.ConfigurationOption{
		config.WithCustomAuth(d.providerData.RoundTripper),
		utils.UserAgentConfigOption(d.providerData.Version),
	}
	if d.providerData.SQLServerFlexCustomEndpoint != "" {
		apiClientConfigOptions = append(
			apiClientConfigOptions,
			config.WithEndpoint(d.providerData.SQLServerFlexCustomEndpoint),
		)
	} else {
		apiClientConfigOptions = append(
			apiClientConfigOptions,
			config.WithRegion(d.providerData.GetRegion()),
		)
	}
	apiClient, err := sqlserverflexbetaPkg.NewAPIClient(apiClientConfigOptions...)
	if err != nil {
		resp.Diagnostics.AddError(
			"Error configuring API client",
			fmt.Sprintf(
				"Configuring client: %v. This is an error related to the provider configuration, not to the resource configuration",
				err,
			),
		)
		return
	}
	d.client = apiClient
	tflog.Info(ctx, fmt.Sprintf("%s client configured", errorPrefix))
}

func (d *instanceDataSource) Read(ctx context.Context, req datasource.ReadRequest, resp *datasource.ReadResponse) {
	var data dataSourceModel

	// Read Terraform configuration data into the model
	resp.Diagnostics.Append(req.Config.Get(ctx, &data)...)

	if resp.Diagnostics.HasError() {
		return
	}

	ctx = core.InitProviderContext(ctx)

	projectId := data.ProjectId.ValueString()
	region := d.providerData.GetRegionWithOverride(data.Region)
	instanceId := data.InstanceId.ValueString()

	ctx = tflog.SetField(ctx, "project_id", projectId)
	ctx = tflog.SetField(ctx, "region", region)
	ctx = tflog.SetField(ctx, "instance_id", instanceId)

	instanceResp, err := d.client.GetInstanceRequest(ctx, projectId, region, instanceId).Execute()
	if err != nil {
		utils.LogError(
			ctx,
			&resp.Diagnostics,
			err,
			"Reading instance",
			fmt.Sprintf("instance with ID %q does not exist in project %q.", instanceId, projectId),
			map[int]string{
				http.StatusForbidden: fmt.Sprintf("Project with ID %q not found or forbidden access", projectId),
			},
		)
		resp.State.RemoveResource(ctx)
		return
	}

	ctx = core.LogResponse(ctx)

	err = mapDataResponseToModel(ctx, instanceResp, &data, resp.Diagnostics)
	if err != nil {
		core.LogAndAddError(
			ctx,
			&resp.Diagnostics,
			fmt.Sprintf("%s Read", errorPrefix),
			fmt.Sprintf("Processing API payload: %v", err),
		)
		return
	}

	// Save data into Terraform state
	resp.Diagnostics.Append(resp.State.Set(ctx, &data)...)
}