// Copyright (c) EZSCALE.
// SPDX-License-Identifier: MPL-2.0

package provider

import (
	"context"
	"fmt"

	"terraform-provider-virtfusion/internal/client"

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

var (
	_ datasource.DataSource              = &SelfServiceUsageDataSource{}
	_ datasource.DataSourceWithConfigure = &SelfServiceUsageDataSource{}
)

// NewSelfServiceUsageDataSource returns a new self-service usage data source.
func NewSelfServiceUsageDataSource() datasource.DataSource {
	return &SelfServiceUsageDataSource{}
}

// SelfServiceUsageDataSource defines the data source implementation.
type SelfServiceUsageDataSource struct {
	client *client.Client
}

// SelfServiceUsageDataSourceModel describes the data source data model.
type SelfServiceUsageDataSourceModel struct {
	UserID    types.Int64  `tfsdk:"user_id"`
	GroupID   types.Int64  `tfsdk:"group_id"`
	UsageJSON types.String `tfsdk:"usage_json"`
}

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

func (d *SelfServiceUsageDataSource) Schema(_ context.Context, _ datasource.SchemaRequest, resp *datasource.SchemaResponse) {
	resp.Schema = schema.Schema{
		MarkdownDescription: "Fetches VirtFusion self-service usage data for a user and group.",
		Attributes: map[string]schema.Attribute{
			"user_id": schema.Int64Attribute{
				MarkdownDescription: "The user ID to fetch usage data for.",
				Required:            true,
			},
			"group_id": schema.Int64Attribute{
				MarkdownDescription: "The group ID to fetch usage data for.",
				Required:            true,
			},
			"usage_json": schema.StringAttribute{
				MarkdownDescription: "The raw JSON response containing usage data.",
				Computed:            true,
			},
		},
	}
}

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

	c, ok := req.ProviderData.(*client.Client)
	if !ok {
		resp.Diagnostics.AddError(
			"Unexpected Data Source Configure Type",
			fmt.Sprintf("Expected *client.Client, got: %T.", req.ProviderData),
		)
		return
	}

	d.client = c
}

func (d *SelfServiceUsageDataSource) Read(ctx context.Context, req datasource.ReadRequest, resp *datasource.ReadResponse) {
	var data SelfServiceUsageDataSourceModel
	resp.Diagnostics.Append(req.Config.Get(ctx, &data)...)
	if resp.Diagnostics.HasError() {
		return
	}

	rawResp, err := d.client.Get(ctx, fmt.Sprintf("/selfService/usage/byUser/%d/group/%d", data.UserID.ValueInt64(), data.GroupID.ValueInt64()))
	if err != nil {
		resp.Diagnostics.AddError("Error Reading Self-Service Usage", err.Error())
		return
	}

	data.UsageJSON = types.StringValue(string(rawResp))

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