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

package provider

import (
	"context"
	"fmt"
	"os"

	"terraform-provider-virtfusion/internal/client"

	"github.com/hashicorp/terraform-plugin-framework/datasource"
	dsschema "github.com/hashicorp/terraform-plugin-framework/datasource/schema"
	"github.com/hashicorp/terraform-plugin-framework/provider"
	"github.com/hashicorp/terraform-plugin-framework/provider/schema"
	"github.com/hashicorp/terraform-plugin-framework/resource"
	"github.com/hashicorp/terraform-plugin-framework/types"
)

const defaultResultsPerPage int64 = 300

// resultsSchemaAttribute returns the standard "results" schema attribute for list data sources.
func resultsSchemaAttribute() dsschema.Int64Attribute {
	return dsschema.Int64Attribute{
		MarkdownDescription: "Maximum number of results to return. Defaults to 300.",
		Optional:            true,
	}
}

// resultsQueryParam returns the query parameter string for the results limit.
// If results is null/unknown, defaults to defaultResultsPerPage.
func resultsQueryParam(results types.Int64) string {
	n := defaultResultsPerPage
	if !results.IsNull() && !results.IsUnknown() {
		n = results.ValueInt64()
	}
	return fmt.Sprintf("results=%d", n)
}

var _ provider.Provider = &VirtfusionProvider{}

// VirtfusionProvider defines the provider implementation.
type VirtfusionProvider struct {
	version string
}

// VirtfusionProviderModel describes the provider data model.
type VirtfusionProviderModel struct {
	Endpoint types.String `tfsdk:"endpoint"`
	ApiToken types.String `tfsdk:"api_token"`
}

func (p *VirtfusionProvider) Metadata(_ context.Context, _ provider.MetadataRequest, resp *provider.MetadataResponse) {
	resp.TypeName = "virtfusion"
	resp.Version = p.version
}

func (p *VirtfusionProvider) Schema(_ context.Context, _ provider.SchemaRequest, resp *provider.SchemaResponse) {
	resp.Schema = schema.Schema{
		MarkdownDescription: "The VirtFusion provider allows managing VirtFusion virtualization platform resources.",
		Attributes: map[string]schema.Attribute{
			"endpoint": schema.StringAttribute{
				MarkdownDescription: "The VirtFusion API endpoint. Can be a hostname (e.g. `cp.example.com`) or full URL (e.g. `https://cp.example.com/api/v1`). Can also be set with the `VIRTFUSION_ENDPOINT` environment variable.",
				Optional:            true,
			},
			"api_token": schema.StringAttribute{
				MarkdownDescription: "The API token for authentication. Can also be set with the `VIRTFUSION_API_TOKEN` environment variable.",
				Optional:            true,
				Sensitive:           true,
			},
		},
	}
}

func (p *VirtfusionProvider) Configure(ctx context.Context, req provider.ConfigureRequest, resp *provider.ConfigureResponse) {
	var data VirtfusionProviderModel
	resp.Diagnostics.Append(req.Config.Get(ctx, &data)...)
	if resp.Diagnostics.HasError() {
		return
	}

	// Environment variables as fallback
	endpoint := os.Getenv("VIRTFUSION_ENDPOINT")
	apiToken := os.Getenv("VIRTFUSION_API_TOKEN")

	// Config values override env vars
	if !data.Endpoint.IsNull() && data.Endpoint.ValueString() != "" {
		endpoint = data.Endpoint.ValueString()
	}
	if !data.ApiToken.IsNull() && data.ApiToken.ValueString() != "" {
		apiToken = data.ApiToken.ValueString()
	}

	if endpoint == "" {
		resp.Diagnostics.AddError(
			"Missing Endpoint Configuration",
			"The VirtFusion endpoint was not found in the VIRTFUSION_ENDPOINT environment variable or provider configuration block endpoint attribute.",
		)
	}
	if apiToken == "" {
		resp.Diagnostics.AddError(
			"Missing API Token Configuration",
			"The API token was not found in the VIRTFUSION_API_TOKEN environment variable or provider configuration block api_token attribute.",
		)
	}
	if resp.Diagnostics.HasError() {
		return
	}

	c, err := client.New(endpoint, apiToken)
	if err != nil {
		resp.Diagnostics.AddError("Failed to Create Client", err.Error())
		return
	}

	resp.DataSourceData = c
	resp.ResourceData = c
}

func (p *VirtfusionProvider) Resources(_ context.Context) []func() resource.Resource {
	return []func() resource.Resource{
		NewServerResource,
		NewServerBuildResource,
		NewSSHKeyResource,
		NewUserResource,
		NewServerFirewallResource,
		NewServerNetworkWhitelistResource,
		NewServerIPv4Resource,
		NewServerTrafficBlockResource,
		NewIPBlockRangeResource,
		NewSelfServiceCreditResource,
		NewSelfServiceResourcePackResource,
		NewSelfServiceHourlyGroupProfileResource,
		NewSelfServiceResourceGroupProfileResource,
		NewServerPowerActionResource,
		NewServerPasswordResetResource,
		NewUserPasswordResetResource,
		NewUserAuthTokenResource,
		NewUserServerAuthTokenResource,
		NewSelfServicePackServersActionResource,
		NewSelfServiceHourlyResourcePackResource,
	}
}

func (p *VirtfusionProvider) DataSources(_ context.Context) []func() datasource.DataSource {
	return []func() datasource.DataSource{
		NewHypervisorDataSource,
		NewHypervisorsDataSource,
		NewHypervisorGroupDataSource,
		NewHypervisorGroupsDataSource,
		NewHypervisorGroupResourcesDataSource,
		NewServerDataSource,
		NewServersDataSource,
		NewServersByUserDataSource,
		NewServerTemplatesDataSource,
		NewServerTrafficDataSource,
		NewServerTrafficBlocksDataSource,
		NewServerVNCDataSource,
		NewServerBackupsDataSource,
		NewServerFirewallDataSource,
		NewPackageDataSource,
		NewPackagesDataSource,
		NewPackageTemplatesDataSource,
		NewIPBlockDataSource,
		NewIPBlocksDataSource,
		NewSSHKeyDataSource,
		NewSSHKeysByUserDataSource,
		NewUserDataSource,
		NewDNSServiceDataSource,
		NewISODataSource,
		NewQueueItemDataSource,
		NewSelfServiceCurrenciesDataSource,
		NewSelfServiceResourcePackDataSource,
		NewSelfServiceHourlyStatsDataSource,
		NewSelfServiceReportDataSource,
		NewSelfServiceUsageDataSource,
	}
}

func New(version string) func() provider.Provider {
	return func() provider.Provider {
		return &VirtfusionProvider{
			version: version,
		}
	}
}