package sqlserverflexbeta

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

	"github.com/hashicorp/terraform-plugin-framework/datasource"
	"github.com/hashicorp/terraform-plugin-framework/datasource/schema"
	"github.com/hashicorp/terraform-plugin-framework/diag"
	"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/database/datasources_gen"
)

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

const errorPrefix = "[Sqlserverflexbeta - Database]"

func NewDatabaseDataSource() datasource.DataSource {
	return &databaseDataSource{}
}

type dataSourceModel struct {
	sqlserverflexbetaGen.DatabaseModel
	TerraformId types.String `tfsdk:"id"`
}

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

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

func (d *databaseDataSource) Schema(ctx context.Context, _ datasource.SchemaRequest, resp *datasource.SchemaResponse) {
	resp.Schema = sqlserverflexbetaGen.DatabaseDataSourceSchema(ctx)
	resp.Schema.Attributes["id"] = schema.StringAttribute{
		Computed:            true,
		Description:         "The terraform internal identifier.",
		MarkdownDescription: "The terraform internal identifier.",
	}
}

// Configure adds the provider configured client to the data source.
func (d *databaseDataSource) 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 *databaseDataSource) 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)

	// Extract identifiers from the plan
	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)

	databaseName := data.DatabaseName.ValueString()

	databaseResp, err := d.client.GetDatabaseRequest(ctx, projectId, region, instanceId, databaseName).Execute()
	if err != nil {
		handleReadError(ctx, &resp.Diagnostics, err, projectId, instanceId)
		resp.State.RemoveResource(ctx)
		return
	}

	ctx = core.LogResponse(ctx)
	// Map response body to schema and populate Computed attribute values
	err = mapFields(databaseResp, &data, region)
	if err != nil {
		core.LogAndAddError(
			ctx,
			&resp.Diagnostics,
			"Error reading database",
			fmt.Sprintf("Processing API payload: %v", err),
		)
		return
	}

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

	tflog.Info(ctx, "SQL Server Flex beta database read")
}

// handleReadError centralizes API error handling for the Read operation.
func handleReadError(ctx context.Context, diags *diag.Diagnostics, err error, projectId, instanceId string) {
	utils.LogError(
		ctx,
		diags,
		err,
		"Reading database",
		fmt.Sprintf(
			"Could not retrieve database for instance %q in project %q.",
			instanceId,
			projectId,
		),
		map[int]string{
			http.StatusBadRequest: fmt.Sprintf(
				"Invalid request parameters for project %q and instance %q.",
				projectId,
				instanceId,
			),
			http.StatusNotFound: fmt.Sprintf(
				"Database, instance %q, or project %q not found.",
				instanceId,
				projectId,
			),
			http.StatusForbidden: fmt.Sprintf("Forbidden access to project %q.", projectId),
		},
	)
}