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

package provider

import (
	"context"
	"encoding/json"
	"fmt"
	"net/url"

	"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              = &UserDataSource{}
	_ datasource.DataSourceWithConfigure = &UserDataSource{}
)

// NewUserDataSource returns a new user data source.
func NewUserDataSource() datasource.DataSource {
	return &UserDataSource{}
}

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

// UserDataSourceModel describes the data source data model.
type UserDataSourceModel struct {
	ExtRelationID types.String `tfsdk:"ext_relation_id"`
	ID            types.Int64  `tfsdk:"id"`
	Name          types.String `tfsdk:"name"`
	Email         types.String `tfsdk:"email"`
	Enabled       types.Bool   `tfsdk:"enabled"`
	CreatedAt     types.String `tfsdk:"created_at"`
	UpdatedAt     types.String `tfsdk:"updated_at"`
}

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

func (d *UserDataSource) Schema(_ context.Context, _ datasource.SchemaRequest, resp *datasource.SchemaResponse) {
	resp.Schema = schema.Schema{
		MarkdownDescription: "Fetches a VirtFusion user by external relation ID.",
		Attributes: map[string]schema.Attribute{
			"ext_relation_id": schema.StringAttribute{
				MarkdownDescription: "The external relation ID of the user.",
				Required:            true,
			},
			"id": schema.Int64Attribute{
				MarkdownDescription: "The numeric ID of the user.",
				Computed:            true,
			},
			"name": schema.StringAttribute{
				MarkdownDescription: "The user name.",
				Computed:            true,
			},
			"email": schema.StringAttribute{
				MarkdownDescription: "The user email address.",
				Computed:            true,
			},
			"enabled": schema.BoolAttribute{
				MarkdownDescription: "Whether the user is enabled.",
				Computed:            true,
			},
			"created_at": schema.StringAttribute{
				MarkdownDescription: "The creation timestamp.",
				Computed:            true,
			},
			"updated_at": schema.StringAttribute{
				MarkdownDescription: "The last update timestamp.",
				Computed:            true,
			},
		},
	}
}

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

	rawResp, err := d.client.Get(ctx, fmt.Sprintf("/users/%s/byExtRelation", url.PathEscape(data.ExtRelationID.ValueString())))
	if err != nil {
		resp.Diagnostics.AddError("Error Reading User", err.Error())
		return
	}

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

	data.ID = types.Int64Value(userResp.Data.ID)
	data.Name = types.StringValue(userResp.Data.Name)
	data.Email = types.StringValue(userResp.Data.Email)
	data.Enabled = types.BoolValue(userResp.Data.Enabled)
	data.CreatedAt = types.StringValue(userResp.Data.CreatedAt)
	data.UpdatedAt = types.StringValue(userResp.Data.UpdatedAt)

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