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

// NewIPBlocksDataSource returns a new IP blocks data source.
func NewIPBlocksDataSource() datasource.DataSource {
	return &IPBlocksDataSource{}
}

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

// IPBlocksDataSourceModel describes the data source data model.
type IPBlocksDataSourceModel struct {
	Results  types.Int64        `tfsdk:"results"`
	IPBlocks []IPBlockItemModel `tfsdk:"ip_blocks"`
}

// IPBlockItemModel describes a single IP block in the list.
type IPBlockItemModel struct {
	ID      types.Int64  `tfsdk:"id"`
	Name    types.String `tfsdk:"name"`
	Type    types.Int64  `tfsdk:"type"`
	Gateway types.String `tfsdk:"gateway"`
	Netmask types.String `tfsdk:"netmask"`
	Enabled types.Bool   `tfsdk:"enabled"`
}

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

func (d *IPBlocksDataSource) Schema(_ context.Context, _ datasource.SchemaRequest, resp *datasource.SchemaResponse) {
	resp.Schema = schema.Schema{
		MarkdownDescription: "Fetches all VirtFusion IP blocks.",
		Attributes: map[string]schema.Attribute{
			"results": resultsSchemaAttribute(),
			"ip_blocks": schema.ListNestedAttribute{
				MarkdownDescription: "List of IP blocks.",
				Computed:            true,
				NestedObject: schema.NestedAttributeObject{
					Attributes: map[string]schema.Attribute{
						"id": schema.Int64Attribute{
							MarkdownDescription: "The IP block ID.",
							Computed:            true,
						},
						"name": schema.StringAttribute{
							MarkdownDescription: "The IP block name.",
							Computed:            true,
						},
						"type": schema.Int64Attribute{
							MarkdownDescription: "The IP block type (4 = IPv4, 6 = IPv6).",
							Computed:            true,
						},
						"gateway": schema.StringAttribute{
							MarkdownDescription: "The IPv4 gateway address.",
							Computed:            true,
						},
						"netmask": schema.StringAttribute{
							MarkdownDescription: "The IPv4 netmask.",
							Computed:            true,
						},
						"enabled": schema.BoolAttribute{
							MarkdownDescription: "Whether the IP block is enabled.",
							Computed:            true,
						},
					},
				},
			},
		},
	}
}

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

	rawResp, err := d.client.GetAllPages(ctx, fmt.Sprintf("/connectivity/ipblocks?%s", resultsQueryParam(data.Results)))
	if err != nil {
		resp.Diagnostics.AddError("Error Reading IP Blocks", err.Error())
		return
	}

	var listResp client.IPBlockListResponse
	if err := json.Unmarshal(rawResp, &listResp); err != nil {
		resp.Diagnostics.AddError("Error Parsing IP Blocks Response", err.Error())
		return
	}

	data.IPBlocks = make([]IPBlockItemModel, len(listResp.Data))
	for i, b := range listResp.Data {
		data.IPBlocks[i] = IPBlockItemModel{
			ID:      types.Int64Value(b.ID),
			Name:    types.StringValue(b.Name),
			Type:    types.Int64Value(b.Type),
			Gateway: types.StringValue(b.IPv4.Gateway),
			Netmask: types.StringValue(b.IPv4.Netmask),
			Enabled: types.BoolValue(b.Enabled),
		}
	}

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