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

package provider

import (
	"context"
	"encoding/json"
	"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              = &ISODataSource{}
	_ datasource.DataSourceWithConfigure = &ISODataSource{}
)

// NewISODataSource returns a new ISO data source.
func NewISODataSource() datasource.DataSource {
	return &ISODataSource{}
}

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

// ISODataSourceModel describes the data source data model.
type ISODataSourceModel struct {
	ID   types.Int64  `tfsdk:"id"`
	Name types.String `tfsdk:"name"`
}

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

func (d *ISODataSource) Schema(_ context.Context, _ datasource.SchemaRequest, resp *datasource.SchemaResponse) {
	resp.Schema = schema.Schema{
		MarkdownDescription: "Fetches a single VirtFusion ISO by ID.",
		Attributes: map[string]schema.Attribute{
			"id": schema.Int64Attribute{
				MarkdownDescription: "The ISO ID.",
				Required:            true,
			},
			"name": schema.StringAttribute{
				MarkdownDescription: "The ISO name.",
				Computed:            true,
			},
		},
	}
}

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

	rawResp, err := d.client.Get(ctx, fmt.Sprintf("/media/iso/%d", data.ID.ValueInt64()))
	if err != nil {
		resp.Diagnostics.AddError("Error Reading ISO", err.Error())
		return
	}

	var isoResp client.ISOResponse
	if err := json.Unmarshal(rawResp, &isoResp); err != nil {
		resp.Diagnostics.AddError("Error Parsing ISO Response", err.Error())
		return
	}

	data.ID = types.Int64Value(isoResp.Data.ID)
	data.Name = types.StringValue(isoResp.Data.Name)

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