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

// NewSSHKeysByUserDataSource returns a new SSH keys by user data source.
func NewSSHKeysByUserDataSource() datasource.DataSource {
	return &SSHKeysByUserDataSource{}
}

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

// SSHKeysByUserDataSourceModel describes the data source data model.
type SSHKeysByUserDataSourceModel struct {
	UserID  types.Int64             `tfsdk:"user_id"`
	Results types.Int64             `tfsdk:"results"`
	SSHKeys []SSHKeyByUserItemModel `tfsdk:"ssh_keys"`
}

// SSHKeyByUserItemModel describes a single SSH key in the list.
type SSHKeyByUserItemModel struct {
	ID        types.Int64  `tfsdk:"id"`
	Name      types.String `tfsdk:"name"`
	Type      types.String `tfsdk:"type"`
	PublicKey types.String `tfsdk:"public_key"`
	Enabled   types.Bool   `tfsdk:"enabled"`
}

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

func (d *SSHKeysByUserDataSource) Schema(_ context.Context, _ datasource.SchemaRequest, resp *datasource.SchemaResponse) {
	resp.Schema = schema.Schema{
		MarkdownDescription: "Fetches all SSH keys for a VirtFusion user.",
		Attributes: map[string]schema.Attribute{
			"user_id": schema.Int64Attribute{
				MarkdownDescription: "The user ID to fetch SSH keys for.",
				Required:            true,
			},
			"results": resultsSchemaAttribute(),
			"ssh_keys": schema.ListNestedAttribute{
				MarkdownDescription: "List of SSH keys belonging to the user.",
				Computed:            true,
				NestedObject: schema.NestedAttributeObject{
					Attributes: map[string]schema.Attribute{
						"id": schema.Int64Attribute{
							MarkdownDescription: "The SSH key ID.",
							Computed:            true,
						},
						"name": schema.StringAttribute{
							MarkdownDescription: "The SSH key name.",
							Computed:            true,
						},
						"type": schema.StringAttribute{
							MarkdownDescription: "The SSH key type.",
							Computed:            true,
						},
						"public_key": schema.StringAttribute{
							MarkdownDescription: "The public key content.",
							Computed:            true,
						},
						"enabled": schema.BoolAttribute{
							MarkdownDescription: "Whether the SSH key is enabled.",
							Computed:            true,
						},
					},
				},
			},
		},
	}
}

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

	rawResp, err := d.client.GetAllPages(ctx, fmt.Sprintf("/ssh_keys/user/%d?%s", data.UserID.ValueInt64(), resultsQueryParam(data.Results)))
	if err != nil {
		resp.Diagnostics.AddError("Error Reading SSH Keys By User", err.Error())
		return
	}

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

	data.SSHKeys = make([]SSHKeyByUserItemModel, len(listResp.Data))
	for i, k := range listResp.Data {
		data.SSHKeys[i] = SSHKeyByUserItemModel{
			ID:        types.Int64Value(k.ID),
			Name:      types.StringValue(k.Name),
			Type:      types.StringValue(k.Type),
			PublicKey: types.StringValue(k.PublicKey),
			Enabled:   types.BoolValue(k.Enabled),
		}
	}

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