package config

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

	"github.com/databricks/cli/bundle/config/resources"
	"github.com/databricks/databricks-sdk-go"
)

// Resources defines Databricks resources associated with the bundle.
type Resources struct {
	Jobs      map[string]*resources.Job      `json:"jobs,omitempty"`
	Pipelines map[string]*resources.Pipeline `json:"pipelines,omitempty"`

	Models                map[string]*resources.MlflowModel          `json:"models,omitempty"`
	Experiments           map[string]*resources.MlflowExperiment     `json:"experiments,omitempty"`
	ModelServingEndpoints map[string]*resources.ModelServingEndpoint `json:"model_serving_endpoints,omitempty"`
	RegisteredModels      map[string]*resources.RegisteredModel      `json:"registered_models,omitempty"`
	QualityMonitors       map[string]*resources.QualityMonitor       `json:"quality_monitors,omitempty"`
	Schemas               map[string]*resources.Schema               `json:"schemas,omitempty"`
	Clusters              map[string]*resources.Cluster              `json:"clusters,omitempty"`
	Dashboards            map[string]*resources.Dashboard            `json:"dashboards,omitempty"`
	Apps                  map[string]*resources.App                  `json:"apps,omitempty"`
}

type ConfigResource interface {
	// Function to assert if the resource exists in the workspace configured in
	// the input workspace client.
	Exists(ctx context.Context, w *databricks.WorkspaceClient, id string) (bool, error)

	// Terraform equivalent name of the resource. For example "databricks_job"
	// for jobs and "databricks_pipeline" for pipelines.
	TerraformResourceName() string

	// GetName returns the in-product name of the resource.
	GetName() string

	// GetURL returns the URL of the resource.
	GetURL() string

	// InitializeURL initializes the URL field of the resource.
	InitializeURL(baseURL url.URL)

	// IsNil returns true if the resource is nil, for example, when it was removed from the bundle.
	IsNil() bool
}

// ResourceGroup represents a group of resources of the same type.
// It includes a description of the resource type and a map of resources.
type ResourceGroup struct {
	Description ResourceDescription
	Resources   map[string]ConfigResource
}

// collectResourceMap collects resources of a specific type into a ResourceGroup.
func collectResourceMap[T ConfigResource](
	description ResourceDescription,
	input map[string]T,
) ResourceGroup {
	resources := make(map[string]ConfigResource)
	for key, resource := range input {
		if resource.IsNil() {
			continue
		}
		resources[key] = resource
	}
	return ResourceGroup{
		Description: description,
		Resources:   resources,
	}
}

// AllResources returns all resources in the bundle grouped by their resource type.
func (r *Resources) AllResources() []ResourceGroup {
	descriptions := SupportedResources()
	return []ResourceGroup{
		collectResourceMap(descriptions["jobs"], r.Jobs),
		collectResourceMap(descriptions["pipelines"], r.Pipelines),
		collectResourceMap(descriptions["models"], r.Models),
		collectResourceMap(descriptions["experiments"], r.Experiments),
		collectResourceMap(descriptions["model_serving_endpoints"], r.ModelServingEndpoints),
		collectResourceMap(descriptions["registered_models"], r.RegisteredModels),
		collectResourceMap(descriptions["quality_monitors"], r.QualityMonitors),
		collectResourceMap(descriptions["schemas"], r.Schemas),
		collectResourceMap(descriptions["clusters"], r.Clusters),
		collectResourceMap(descriptions["dashboards"], r.Dashboards),
		collectResourceMap(descriptions["apps"], r.Apps),
	}
}

func (r *Resources) FindResourceByConfigKey(key string) (ConfigResource, error) {
	found := make([]ConfigResource, 0)
	for k := range r.Jobs {
		if k == key {
			found = append(found, r.Jobs[k])
		}
	}

	for k := range r.Pipelines {
		if k == key {
			found = append(found, r.Pipelines[k])
		}
	}

	for k := range r.Apps {
		if k == key {
			found = append(found, r.Apps[k])
		}
	}

	if len(found) == 0 {
		return nil, fmt.Errorf("no such resource: %s", key)
	}

	if len(found) > 1 {
		keys := make([]string, 0, len(found))
		for _, r := range found {
			keys = append(keys, fmt.Sprintf("%s:%s", r.TerraformResourceName(), key))
		}
		return nil, fmt.Errorf("ambiguous: %s (can resolve to all of %s)", key, keys)
	}

	return found[0], nil
}

type ResourceDescription struct {
	// Singular and plural name when used to refer to the configuration.
	SingularName string
	PluralName   string

	// Singular and plural title when used in summaries / terminal UI.
	SingularTitle string
	PluralTitle   string
}

// The keys of the map corresponds to the resource key in the bundle configuration.
func SupportedResources() map[string]ResourceDescription {
	return map[string]ResourceDescription{
		"jobs": {
			SingularName:  "job",
			PluralName:    "jobs",
			SingularTitle: "Job",
			PluralTitle:   "Jobs",
		},
		"pipelines": {
			SingularName:  "pipeline",
			PluralName:    "pipelines",
			SingularTitle: "Pipeline",
			PluralTitle:   "Pipelines",
		},
		"models": {
			SingularName:  "model",
			PluralName:    "models",
			SingularTitle: "Model",
			PluralTitle:   "Models",
		},
		"experiments": {
			SingularName:  "experiment",
			PluralName:    "experiments",
			SingularTitle: "Experiment",
			PluralTitle:   "Experiments",
		},
		"model_serving_endpoints": {
			SingularName:  "model_serving_endpoint",
			PluralName:    "model_serving_endpoints",
			SingularTitle: "Model Serving Endpoint",
			PluralTitle:   "Model Serving Endpoints",
		},
		"registered_models": {
			SingularName:  "registered_model",
			PluralName:    "registered_models",
			SingularTitle: "Registered Model",
			PluralTitle:   "Registered Models",
		},
		"quality_monitors": {
			SingularName:  "quality_monitor",
			PluralName:    "quality_monitors",
			SingularTitle: "Quality Monitor",
			PluralTitle:   "Quality Monitors",
		},
		"schemas": {
			SingularName:  "schema",
			PluralName:    "schemas",
			SingularTitle: "Schema",
			PluralTitle:   "Schemas",
		},
		"clusters": {
			SingularName:  "cluster",
			PluralName:    "clusters",
			SingularTitle: "Cluster",
			PluralTitle:   "Clusters",
		},
		"dashboards": {
			SingularName:  "dashboard",
			PluralName:    "dashboards",
			SingularTitle: "Dashboard",
			PluralTitle:   "Dashboards",
		},
		"apps": {
			SingularName:  "app",
			PluralName:    "apps",
			SingularTitle: "App",
			PluralTitle:   "Apps",
		},
	}
}