// 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              = &SelfServiceCurrenciesDataSource{}
	_ datasource.DataSourceWithConfigure = &SelfServiceCurrenciesDataSource{}
)

// NewSelfServiceCurrenciesDataSource returns a new self-service currencies data source.
func NewSelfServiceCurrenciesDataSource() datasource.DataSource {
	return &SelfServiceCurrenciesDataSource{}
}

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

// SelfServiceCurrenciesDataSourceModel describes the data source data model.
type SelfServiceCurrenciesDataSourceModel struct {
	Results    types.Int64         `tfsdk:"results"`
	Currencies []CurrencyItemModel `tfsdk:"currencies"`
}

// CurrencyItemModel describes a single currency in the list.
type CurrencyItemModel struct {
	ID   types.Int64  `tfsdk:"id"`
	Code types.String `tfsdk:"code"`
	Name types.String `tfsdk:"name"`
}

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

func (d *SelfServiceCurrenciesDataSource) Schema(_ context.Context, _ datasource.SchemaRequest, resp *datasource.SchemaResponse) {
	resp.Schema = schema.Schema{
		MarkdownDescription: "Fetches all available VirtFusion self-service currencies.",
		Attributes: map[string]schema.Attribute{
			"results": resultsSchemaAttribute(),
			"currencies": schema.ListNestedAttribute{
				MarkdownDescription: "List of available currencies.",
				Computed:            true,
				NestedObject: schema.NestedAttributeObject{
					Attributes: map[string]schema.Attribute{
						"id": schema.Int64Attribute{
							MarkdownDescription: "The currency ID.",
							Computed:            true,
						},
						"code": schema.StringAttribute{
							MarkdownDescription: "The currency code.",
							Computed:            true,
						},
						"name": schema.StringAttribute{
							MarkdownDescription: "The currency name.",
							Computed:            true,
						},
					},
				},
			},
		},
	}
}

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

	rawResp, err := d.client.GetAllPages(ctx, fmt.Sprintf("/selfService/currencies?%s", resultsQueryParam(data.Results)))
	if err != nil {
		resp.Diagnostics.AddError("Error Reading Self-Service Currencies", err.Error())
		return
	}

	var currencyResp client.CurrencyResponse
	if err := json.Unmarshal(rawResp, &currencyResp); err != nil {
		resp.Diagnostics.AddError("Error Parsing Self-Service Currencies Response", err.Error())
		return
	}

	data.Currencies = make([]CurrencyItemModel, len(currencyResp.Data))
	for i, c := range currencyResp.Data {
		data.Currencies[i] = CurrencyItemModel{
			ID:   types.Int64Value(c.ID),
			Code: types.StringValue(c.Code),
			Name: types.StringValue(c.Name),
		}
	}

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