// Copyright IBM Corp. 2014, 2026
// SPDX-License-Identifier: BUSL-1.1

package stackaddrs

import (
	"fmt"

	"github.com/hashicorp/terraform/internal/addrs"
	"github.com/hashicorp/terraform/internal/collections"
)

// ProviderConfigRef is a reference-only address type representing a reference
// to a particular provider configuration using its local name, since local
// name is how we refer to providers when they appear in expressions.
//
// The referent of a ProviderConfigRef is a [ProviderConfig], so resolving
// the reference will always require a lookup table from local name to
// fully-qualified provider address.
type ProviderConfigRef struct {
	ProviderLocalName string
	Name              string
}

func (ProviderConfigRef) referenceableSigil() {}

func (r ProviderConfigRef) String() string {
	return "provider." + r.ProviderLocalName + "." + r.Name
}

// ProviderConfig is the address of a "provider" block in a stack configuration.
type ProviderConfig struct {
	Provider addrs.Provider
	Name     string
}

func (ProviderConfig) inStackConfigSigil()   {}
func (ProviderConfig) inStackInstanceSigil() {}

func (c ProviderConfig) String() string {
	return fmt.Sprintf("provider[%q].%s", c.Provider, c.Name)
}

func (v ProviderConfig) UniqueKey() collections.UniqueKey[ProviderConfig] {
	return v
}

// A ProviderConfig is its own [collections.UniqueKey].
func (ProviderConfig) IsUniqueKey(ProviderConfig) {}

// ConfigProviderConfig places a [ProviderConfig] in the context of a particular [Stack].
type ConfigProviderConfig = InStackConfig[ProviderConfig]

// AbsProviderConfig places a [ProviderConfig] in the context of a particular [StackInstance].
type AbsProviderConfig = InStackInstance[ProviderConfig]

// ProviderConfigInstance is the address of a specific provider configuration,
// of which there might potentially be many associated with a given
// [ProviderConfig] if that block uses the "for_each" argument.
type ProviderConfigInstance struct {
	ProviderConfig ProviderConfig
	Key            addrs.InstanceKey
}

func (ProviderConfigInstance) inStackConfigSigil()   {}
func (ProviderConfigInstance) inStackInstanceSigil() {}

func (c ProviderConfigInstance) String() string {
	if c.Key == nil {
		return c.ProviderConfig.String()
	}
	return c.ProviderConfig.String() + c.Key.String()
}

func (v ProviderConfigInstance) UniqueKey() collections.UniqueKey[ProviderConfigInstance] {
	return v
}

// A ProviderConfigInstance is its own [collections.UniqueKey].
func (ProviderConfigInstance) IsUniqueKey(ProviderConfigInstance) {}

// ConfigProviderConfigInstance places a [ProviderConfigInstance] in the context of a particular [Stack].
type ConfigProviderConfigInstance = InStackConfig[ProviderConfigInstance]

// AbsProviderConfigInstance places a [ProviderConfigInstance] in the context of a particular [StackInstance].
type AbsProviderConfigInstance = InStackInstance[ProviderConfigInstance]

func AbsProviderToInstance(addr AbsProviderConfig, ik addrs.InstanceKey) AbsProviderConfigInstance {
	return AbsProviderConfigInstance{
		Stack: addr.Stack,
		Item: ProviderConfigInstance{
			ProviderConfig: addr.Item,
			Key:            ik,
		},
	}
}