// Package middleware contains a simple plugin system for Fiber middleware.
// Register plugins by name and factory, then main.go will load them automatically.
package middleware

import (
	"path/filepath"

	"github.com/BurntSushi/toml"
	"github.com/gofiber/fiber/v2"
)

// Plugin holds a plugin's name and a function that makes its handler.
type Plugin struct {
	Name    string
	Factory func() fiber.Handler
}

// registry stores every plugin we've registered.
var registry []Plugin

// RegisterPlugin tags a plugin with a name and a factory so we can use it in the app.
func RegisterPlugin(name string, factory func() fiber.Handler) {
	registry = append(registry, Plugin{Name: name, Factory: factory})
}

// LoadPlugins returns the handler functions for each plugin.
// If skipCheckpoint is true, it skips the plugin named "checkpoint".
func LoadPlugins(skipCheckpoint bool) []fiber.Handler {
	var handlers []fiber.Handler
	for _, p := range registry {
		if skipCheckpoint && p.Name == "checkpoint" {
			continue
		}
		handlers = append(handlers, p.Factory())
	}
	return handlers
}

// LoadConfig loads the TOML file at middleware/config/[name].toml
// and decodes it into the struct you provide.
func LoadConfig(name string, v interface{}) error {
	path := filepath.Join("middleware", "config", name+".toml")
	if _, err := toml.DecodeFile(path, v); err != nil {
		return err
	}
	return nil
}