package provider

import (
	"context"
	"fmt"

	"github.com/hashicorp/terraform-plugin-framework/datasource"
	"github.com/hashicorp/terraform-plugin-framework/datasource/schema"
	"github.com/hashicorp/terraform-plugin-framework/types"
	"github.com/hashicorp/terraform-plugin-log/tflog"

	edgeclient "edp.buildth.ing/DevFW-CICD/edge-connect-client/v2/sdk/edgeconnect/v2"
)

var _ datasource.DataSource = &AppInstanceDataSource{}

func NewAppInstanceDataSource() datasource.DataSource {
	return &AppInstanceDataSource{}
}

type AppInstanceDataSource struct {
	client *edgeclient.Client
}

type AppInstanceDataSourceModel struct {
	Name                 types.String `tfsdk:"name"`
	Organization         types.String `tfsdk:"organization"`
	CloudletName         types.String `tfsdk:"cloudlet_name"`
	CloudletOrganization types.String `tfsdk:"cloudlet_organization"`
	Region               types.String `tfsdk:"region"`
	AppId                types.String `tfsdk:"app_id"`
}

type AppInstancesDataSourceModel struct {
	Name                 types.String                 `tfsdk:"name"`
	Organization         types.String                 `tfsdk:"organization"`
	CloudletName         types.String                 `tfsdk:"cloudlet_name"`
	CloudletOrganization types.String                 `tfsdk:"cloudlet_organization"`
	Region               types.String                 `tfsdk:"region"`
	AppId                types.String                 `tfsdk:"app_id"`
	AppInstances         []AppInstanceDataSourceModel `tfsdk:"appinstances"`
}

func (d *AppInstanceDataSource) Metadata(ctx context.Context, req datasource.MetadataRequest, resp *datasource.MetadataResponse) {
	resp.TypeName = req.ProviderTypeName + "_app_instance"
}

func (d *AppInstanceDataSource) Schema(ctx context.Context, req datasource.SchemaRequest, resp *datasource.SchemaResponse) {
	resp.Schema = schema.Schema{
		MarkdownDescription: "AppInstances data source",
		Attributes: map[string]schema.Attribute{
			"name": schema.StringAttribute{
				MarkdownDescription: "AppInstance name (primary key)",
				Optional:            true,
			},
			"organization": schema.StringAttribute{
				MarkdownDescription: "Organization name (primary key)",
				Optional:            true,
			},
			"cloudlet_name": schema.StringAttribute{
				MarkdownDescription: "Cloudlet name (primary key)",
				Optional:            true,
			},
			"cloudlet_organization": schema.StringAttribute{
				MarkdownDescription: "Cloudlet organization (primary key)",
				Optional:            true,
			},
			"region": schema.StringAttribute{
				MarkdownDescription: "Region (EU or US) (primary key)",
				Required:            true,
			},
			"app_id": schema.StringAttribute{
				MarkdownDescription: "Associated App ID",
				Optional:            true,
			},
			"appinstances": schema.ListNestedAttribute{
				Computed: true,
				NestedObject: schema.NestedAttributeObject{
					Attributes: map[string]schema.Attribute{
						"name": schema.StringAttribute{
							MarkdownDescription: "AppInstance name (primary key)",
							Computed:            true,
						},
						"organization": schema.StringAttribute{
							MarkdownDescription: "Organization name (primary key)",
							Computed:            true,
						},
						"cloudlet_name": schema.StringAttribute{
							MarkdownDescription: "Cloudlet name (primary key)",
							Computed:            true,
						},
						"cloudlet_organization": schema.StringAttribute{
							MarkdownDescription: "Cloudlet organization (primary key)",
							Computed:            true,
						},
						"region": schema.StringAttribute{
							MarkdownDescription: "Region (EU or US) (primary key)",
							Computed:            true,
						},
						"app_id": schema.StringAttribute{
							MarkdownDescription: "Associated App ID",
							Computed:            true,
						},
					},
				},
			},
		},
	}
}

func (d *AppInstanceDataSource) Configure(ctx context.Context, req datasource.ConfigureRequest, resp *datasource.ConfigureResponse) {
	if req.ProviderData == nil {
		return
	}

	client, ok := req.ProviderData.(*edgeclient.Client)

	if !ok {
		resp.Diagnostics.AddError(
			"Unexpected Data Source Configure Type",
			fmt.Sprintf("Expected *edgeclient.Client, got: %T. Please report this issue to the provider developers.", req.ProviderData),
		)

		return
	}

	d.client = client
}

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

	resp.Diagnostics.Append(req.Config.Get(ctx, &data)...)

	if resp.Diagnostics.HasError() {
		return
	}

	appInstKey := edgeclient.AppInstanceKey{
		Organization: data.Organization.ValueString(),
		Name:         data.Name.ValueString(),
		CloudletKey: edgeclient.CloudletKey{
			Organization: data.CloudletOrganization.ValueString(),
			Name:         data.CloudletName.ValueString(),
		},
	}
	appKey := edgeclient.AppKey{
		Name: data.AppId.ValueString(),
	}
	region := data.Region.ValueString()

	appInstances, err := d.client.ShowAppInstances(ctx, appInstKey, appKey, region)
	if err != nil {
		resp.Diagnostics.AddError("Client Error", fmt.Sprintf("Unable to read app instance %s/%s in region %s, got error: %s",
			data.Organization.ValueString(), data.Name.ValueString(), region, err))
		return
	}

	for _, appInst := range appInstances {
		data.AppInstances = append(data.AppInstances, AppInstanceDataSourceModel{
			Name:                 types.StringValue(appInst.Key.Name),
			Organization:         types.StringValue(appInst.Key.Organization),
			CloudletName:         types.StringValue(appInst.Key.CloudletKey.Name),
			CloudletOrganization: types.StringValue(appInst.Key.CloudletKey.Organization),
			Region:               types.StringValue(region),
			AppId:                types.StringValue(appInst.AppKey.Name),
		})
	}
	tflog.Trace(ctx, "read app instances data source")

	resp.Diagnostics.Append(resp.State.Set(ctx, &data)...)
}