package handler

import (
	"context"
	"net/http"
	"time"

	"github.com/beckn-one/beckn-onix/pkg/model"
	"github.com/beckn-one/beckn-onix/pkg/plugin"
	"github.com/beckn-one/beckn-onix/pkg/plugin/definition"
)

// PluginManager defines an interface for managing plugins dynamically.
type PluginManager interface {
	Middleware(ctx context.Context, cfg *plugin.Config) (func(http.Handler) http.Handler, error)
	SignValidator(ctx context.Context, cfg *plugin.Config) (definition.SignValidator, error)
	Validator(ctx context.Context, cfg *plugin.Config) (definition.SchemaValidator, error)
	Router(ctx context.Context, cfg *plugin.Config) (definition.Router, error)
	Publisher(ctx context.Context, cfg *plugin.Config) (definition.Publisher, error)
	Signer(ctx context.Context, cfg *plugin.Config) (definition.Signer, error)
	Step(ctx context.Context, cfg *plugin.Config) (definition.Step, error)
	Cache(ctx context.Context, cfg *plugin.Config) (definition.Cache, error)
	Registry(ctx context.Context, cfg *plugin.Config) (definition.RegistryLookup, error)
	KeyManager(ctx context.Context, cache definition.Cache, rLookup definition.RegistryLookup, cfg *plugin.Config) (definition.KeyManager, error)
	SchemaValidator(ctx context.Context, cfg *plugin.Config) (definition.SchemaValidator, error)
}

// Type defines different handler types for processing requests.
type Type string

const (
	// HandlerTypeStd represents the standard handler type used for general request processing.
	HandlerTypeStd Type = "std"
)

// PluginCfg holds the configuration for various plugins.
type PluginCfg struct {
	SchemaValidator *plugin.Config  `yaml:"schemaValidator,omitempty"`
	SignValidator   *plugin.Config  `yaml:"signValidator,omitempty"`
	Publisher       *plugin.Config  `yaml:"publisher,omitempty"`
	Signer          *plugin.Config  `yaml:"signer,omitempty"`
	Router          *plugin.Config  `yaml:"router,omitempty"`
	Cache           *plugin.Config  `yaml:"cache,omitempty"`
	Registry        *plugin.Config  `yaml:"registry,omitempty"`
	KeyManager      *plugin.Config  `yaml:"keyManager,omitempty"`
	Middleware      []plugin.Config `yaml:"middleware,omitempty"`
	Steps           []plugin.Config
}

// HttpClientConfig defines the configuration for the HTTP transport layer.
type HttpClientConfig struct {
	// MaxIdleConns controls the maximum number of idle (keep-alive)
	// connections across all hosts.
	MaxIdleConns int `yaml:"maxIdleConns"`

	// IdleConnTimeout is the maximum amount of time an idle
	// (keep-alive) connection will remain idle before closing itself.
	IdleConnTimeout time.Duration `yaml:"idleConnTimeout"`

	// MaxIdleConnsPerHost, if non-zero, controls the maximum idle
	// (keep-alive) connections to keep per-host.
	MaxIdleConnsPerHost int `yaml:"maxIdleConnsPerHost"`

	// ResponseHeaderTimeout, if non-zero, specifies the amount of time to wait
	// for a server's response headers after fully writing the request.
	ResponseHeaderTimeout time.Duration `yaml:"responseHeaderTimeout"`
}

// Config holds the configuration for request processing handlers.
type Config struct {
	Plugins          PluginCfg `yaml:"plugins"`
	Steps            []string
	Type             Type
	RegistryURL      string `yaml:"registryUrl"`
	Role             model.Role
	SubscriberID     string           `yaml:"subscriberId"`
	HttpClientConfig HttpClientConfig `yaml:"httpClientConfig"`
}