package main

import (
	"flag"
	"fmt"
	"path/filepath"

	"git.wntrmute.dev/kyle/mcias/internal/config"
	"git.wntrmute.dev/kyle/mcias/internal/db"
)

// runSnapshot handles the "snapshot" command.
//
// It opens the database read-only (no master key derivation needed — VACUUM
// INTO does not access encrypted columns) and writes a timestamped backup to
// /srv/mcias/backups/ (or the directory adjacent to the configured DB path).
// Backups older than --retain-days are pruned.
func runSnapshot(configPath string, args []string) {
	fs := flag.NewFlagSet("snapshot", flag.ExitOnError)
	retainDays := fs.Int("retain-days", 30, "prune backups older than this many days (0 = keep all)")
	if err := fs.Parse(args); err != nil {
		fatalf("snapshot: %v", err)
	}

	cfg, err := config.Load(configPath)
	if err != nil {
		fatalf("snapshot: load config: %v", err)
	}

	database, err := db.Open(cfg.Database.Path)
	if err != nil {
		fatalf("snapshot: open database: %v", err)
	}
	defer func() { _ = database.Close() }()

	// Place backups in a "backups" directory adjacent to the database file.
	backupDir := filepath.Join(filepath.Dir(cfg.Database.Path), "backups")

	dest, err := database.SnapshotDir(backupDir, *retainDays)
	if err != nil {
		fatalf("snapshot: %v", err)
	}
	fmt.Printf("snapshot written: %s\n", dest)
}