package routes

import (
	"database/sql"
	"log"
	"strings"
)

// EnsureTranslationPerfIndexes creates helpful indexes for translation listing/search.
// It is safe to run on each startup; failures are logged and do not stop the service.
func EnsureTranslationPerfIndexes(db *sql.DB) {
	if db == nil {
		return
	}

	statements := []string{
		`CREATE EXTENSION IF NOT EXISTS pg_trgm`,
		`CREATE INDEX IF NOT EXISTS idx_mk_translator_t_key_lang ON mk_translator (t_key, lang_code)`,
		`CREATE INDEX IF NOT EXISTS idx_mk_translator_status_lang_updated ON mk_translator (status, lang_code, updated_at DESC)`,
		`CREATE INDEX IF NOT EXISTS idx_mk_translator_manual_status ON mk_translator (is_manual, status)`,
		`CREATE INDEX IF NOT EXISTS idx_mk_translator_source_type_expr ON mk_translator ((COALESCE(NULLIF(provider_meta->>'source_type',''),'dummy')))`,
		`CREATE INDEX IF NOT EXISTS idx_mk_translator_source_text_trgm ON mk_translator USING gin (source_text_tr gin_trgm_ops)`,
		`CREATE INDEX IF NOT EXISTS idx_mk_translator_translated_text_trgm ON mk_translator USING gin (translated_text gin_trgm_ops)`,
	}

	for _, stmt := range statements {
		if _, err := db.Exec(stmt); err != nil {
			log.Printf("[TranslationPerf] index_setup_warn sql=%q err=%v", summarizeSQL(stmt), err)
			continue
		}
		log.Printf("[TranslationPerf] index_ready sql=%q", summarizeSQL(stmt))
	}
}

func summarizeSQL(sqlText string) string {
	s := strings.TrimSpace(sqlText)
	if len(s) <= 100 {
		return s
	}
	return s[:100] + "..."
}