package core

import (
	"context"
	"fmt"
	"net/http"
	"strings"

	"github.com/hashicorp/terraform-plugin-framework/types"
	"github.com/stackitcloud/stackit-sdk-go/core/runtime"

	"github.com/hashicorp/terraform-plugin-framework/diag"
	"github.com/hashicorp/terraform-plugin-log/tflog"
)

type ResourceType string

const (
	Resource   ResourceType = "resource"
	Datasource ResourceType = "datasource"

	// Separator used for concatenation of TF-internal resource ID
	Separator = ","

	ResourceRegionFallbackDocstring   = "Uses the `default_region` specified in the provider configuration as a fallback in case no `region` is defined on resource level."
	DatasourceRegionFallbackDocstring = "Uses the `default_region` specified in the provider configuration as a fallback in case no `region` is defined on datasource level."
)

type ProviderData struct {
	RoundTripper        http.RoundTripper
	ServiceAccountEmail string // Deprecated: ServiceAccountEmail is not required and will be removed after 12th June 2025.
	// Deprecated: Use DefaultRegion instead
	Region                          string
	DefaultRegion                   string
	AuthorizationCustomEndpoint     string
	CdnCustomEndpoint               string
	DnsCustomEndpoint               string
	GitCustomEndpoint               string
	IaaSCustomEndpoint              string
	KMSCustomEndpoint               string
	LoadBalancerCustomEndpoint      string
	LogMeCustomEndpoint             string
	MariaDBCustomEndpoint           string
	MongoDBFlexCustomEndpoint       string
	ModelServingCustomEndpoint      string
	ObjectStorageCustomEndpoint     string
	ObservabilityCustomEndpoint     string
	OpenSearchCustomEndpoint        string
	PostgresFlexCustomEndpoint      string
	RabbitMQCustomEndpoint          string
	RedisCustomEndpoint             string
	ResourceManagerCustomEndpoint   string
	ScfCustomEndpoint               string
	SecretsManagerCustomEndpoint    string
	SQLServerFlexCustomEndpoint     string
	ServerBackupCustomEndpoint      string
	ServerUpdateCustomEndpoint      string
	SKECustomEndpoint               string
	ServiceEnablementCustomEndpoint string
	ServiceAccountCustomEndpoint    string
	EnableBetaResources             bool
	Experiments                     []string

	Version string // version of the STACKIT Terraform provider
}

// GetRegion returns the effective region for the provider, falling back to the deprecated _region_ attribute
func (pd *ProviderData) GetRegion() string {
	if pd.DefaultRegion != "" {
		return pd.DefaultRegion
	} else if pd.Region != "" {
		return pd.Region
	}
	// final fallback
	return "eu01"
}

func (pd *ProviderData) GetRegionWithOverride(overrideRegion types.String) string {
	if overrideRegion.IsUnknown() || overrideRegion.IsNull() {
		return pd.GetRegion()
	}
	return overrideRegion.ValueString()
}

// DiagsToError Converts TF diagnostics' errors into an error with a human-readable description.
// If there are no errors, the output is nil
func DiagsToError(diags diag.Diagnostics) error {
	if !diags.HasError() {
		return nil
	}

	diagsError := diags.Errors()
	diagsStrings := make([]string, 0)
	for _, diagnostic := range diagsError {
		diagsStrings = append(diagsStrings, fmt.Sprintf(
			"(%s) %s",
			diagnostic.Summary(),
			diagnostic.Detail(),
		))
	}
	return fmt.Errorf("%s", strings.Join(diagsStrings, ";"))
}

// LogAndAddError Logs the error and adds it to the diags
func LogAndAddError(ctx context.Context, diags *diag.Diagnostics, summary, detail string) {
	if traceId := runtime.GetTraceId(ctx); traceId != "" {
		detail = fmt.Sprintf("%s\nTrace ID: %q", detail, traceId)
	}

	tflog.Error(ctx, fmt.Sprintf("%s | %s", summary, detail))
	diags.AddError(summary, detail)
}

// LogAndAddWarning Logs the warning and adds it to the diags
func LogAndAddWarning(ctx context.Context, diags *diag.Diagnostics, summary, detail string) {
	if traceId := runtime.GetTraceId(ctx); traceId != "" {
		detail = fmt.Sprintf("%s\nTrace ID: %q", detail, traceId)
	}

	tflog.Warn(ctx, fmt.Sprintf("%s | %s", summary, detail))
	diags.AddWarning(summary, detail)
}

func LogAndAddWarningBeta(ctx context.Context, diags *diag.Diagnostics, name string, resourceType ResourceType) {
	warnTitle := fmt.Sprintf("The %s %q is in beta", resourceType, name)
	warnContent := fmt.Sprintf("The %s %q is in beta and may be subject to breaking changes in the future. Use with caution.", resourceType, name)
	tflog.Warn(ctx, fmt.Sprintf("%s | %s", warnTitle, warnContent))
	diags.AddWarning(warnTitle, warnContent)
}

func LogAndAddErrorBeta(ctx context.Context, diags *diag.Diagnostics, name string, resourceType ResourceType) {
	errTitle := fmt.Sprintf("The %s %q is in beta and beta is not enabled", resourceType, name)
	errContent := fmt.Sprintf(`The %s %q is in beta and the beta functionality is currently not enabled. To enable it, set the environment variable STACKIT_TF_ENABLE_BETA_RESOURCES to "true" or set the "enable_beta_resources" provider field to true.`, resourceType, name)
	tflog.Error(ctx, fmt.Sprintf("%s | %s", errTitle, errContent))
	diags.AddError(errTitle, errContent)
}

// InitProviderContext extends the context to capture the http response
func InitProviderContext(ctx context.Context) context.Context {
	// Capture http response to get trace-id
	var httpResp *http.Response
	return runtime.WithCaptureHTTPResponse(ctx, &httpResp)
}

// LogResponse logs the trace-id of the last request
func LogResponse(ctx context.Context) context.Context {
	// Logs the trace-id of the request
	traceId := runtime.GetTraceId(ctx)
	ctx = tflog.SetField(ctx, "x-trace-id", traceId)

	tflog.Info(ctx, "response data", map[string]interface{}{
		"x-trace-id": traceId,
	})
	return ctx
}