package main

import (
	"context"
	"fmt"
	"io"

	"github.com/kami/maven/internal/store"
)

// runWipe implements the -wipe flag: it prints what the database holds, and
// removes it only when the operator also passed -confirm-wipe (Vikunja #494).
//
// Two flags rather than one, because the destructive reading of a single flag
// is the reading a mistyped command gets. Without the confirmation this is a
// dry run that costs nothing and answers the question a QA session actually
// has — what is on this box right now.
//
// It runs before any daemon component is wired, so nothing is writing while
// the tables go. The daemon exits afterwards rather than serving a store it
// just emptied, because every component that read the old rows at boot would
// still be holding them.
func runWipe(ctx context.Context, st *store.Store, out io.Writer, confirmed bool) error {
	counts, err := st.WipeCounts(ctx)
	if err != nil {
		return fmt.Errorf("wipe: read counts: %w", err)
	}
	total := 0
	for _, c := range counts {
		total += c.Rows
		fmt.Fprintf(out, "  %-24s %d\n", c.Table, c.Rows)
	}
	fmt.Fprintf(out, "  %-24s %d rows in %d tables\n", "TOTAL", total, len(counts))

	if !confirmed {
		fmt.Fprintln(out, "\nnothing was deleted. pass -confirm-wipe to delete all of it.")
		fmt.Fprintln(out, "config, models, passkeys and the encryption key are files and are never touched.")
		return nil
	}
	if err := st.Wipe(ctx); err != nil {
		return err
	}
	fmt.Fprintf(out, "\nwiped. %d rows gone, the schema is intact, mavend knows nobody.\n", total)
	return nil
}