package sinks

import (
	"fmt"
	"strings"

	"gitea.maximumdirect.net/ejr/feedkit/config"
)

// requireStringParam returns a non-empty string sink param.
//
// This helper is intentionally local to sinks rather than config so
// driver-specific validation stays close to the adapters that use it.
func requireStringParam(cfg config.SinkConfig, key string) (string, error) {
	v, ok := cfg.Params[key]
	if !ok {
		return "", fmt.Errorf("sink %q: params.%s is required", cfg.Name, key)
	}
	s, ok := v.(string)
	if !ok {
		return "", fmt.Errorf("sink %q: params.%s must be a string", cfg.Name, key)
	}
	if strings.TrimSpace(s) == "" {
		return "", fmt.Errorf("sink %q: params.%s cannot be empty", cfg.Name, key)
	}
	return s, nil
}

// PostgresFactory returns a sink factory that builds the built-in Postgres sink
// using the provided downstream schema definition.
func PostgresFactory(schema PostgresSchema) Factory {
	return func(cfg config.SinkConfig) (Sink, error) {
		return NewPostgresSinkFromConfig(cfg, schema)
	}
}