package pl.genschu.rexcatalog;

import pl.genschu.rexcatalog.db.Database;
import pl.genschu.rexcatalog.ingest.Ingestor;

import java.io.File;
import java.nio.file.Path;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

/**
 * CLI katalogu. Krok 1: indeksowanie obrazów do SQLite.
 * REST + MCP siadają później na tej samej bazie.
 */
public final class Main {

    private static final String CORE_VERSION =
            System.getProperty("catalog.coreVersion", "nieznana");

    public static void main(String[] args) throws Exception {
        if (args.length == 0) {
            usage();
            return;
        }
        Path dataDir = Path.of(System.getProperty("catalog.data", "data"));

        try {
            switch (args[0]) {
                case "ingest" -> ingest(dataDir, args);
                case "list" -> list(dataDir);
                case "stats" -> stats(dataDir);
                default -> usage();
            }
        } finally {
            // bez tego proces wisi po zakończeniu pracy — patrz Headless.shutdown()
            Headless.shutdown();
        }
    }

    private static void ingest(Path dataDir, String[] args) throws Exception {
        if (args.length < 2) {
            System.err.println("ingest wymaga co najmniej jednej ścieżki");
            return;
        }
        Headless.boot();

        List<File> sources = new ArrayList<>();
        for (int i = 1; i < args.length; i++) {
            sources.addAll(Ingestor.expand(new File(args[i])));
        }
        if (sources.isEmpty()) {
            System.err.println("Nie znaleziono nic do zaindeksowania.");
            return;
        }

        System.out.printf("Indeksuję %d kopii (core %s)%n%n", sources.size(), CORE_VERSION);

        try (Database db = Database.open(dataDir)) {
            Ingestor ingestor = new Ingestor(db, CORE_VERSION);
            int ok = 0;
            int failed = 0;

            for (File source : sources) {
                long started = System.currentTimeMillis();
                System.out.printf("  %-46s ", truncate(source.getName(), 46));
                System.out.flush();
                try {
                    Ingestor.Result result = ingestor.ingest(source);
                    long seconds = (System.currentTimeMillis() - started) / 1000;

                    if ("unreadable".equals(result.status())) {
                        System.out.printf("NIECZYTELNY: %s%n", result.statusNote());
                        failed++;
                        continue;
                    }
                    System.out.printf("%5d plików  %2ds%n", result.fileCount(), seconds);
                    if (result.roots().isEmpty()) {
                        System.out.printf("      └─ %s%n", "installer".equals(result.status())
                                ? "płyta instalacyjna — silnik nierozpoznawalny bez rozpakowania"
                                : "silnik nierozpoznany");
                    }
                    for (Ingestor.RootSummary root : result.roots()) {
                        System.out.printf("      └─ %-12s %-13s %s%n",
                                root.rootPath().isEmpty() ? "(korzeń)" : root.rootPath() + "/",
                                root.engine(),
                                root.edition() == null ? "" : truncate(root.edition(), 44));
                    }
                    ok++;
                } catch (Exception e) {
                    System.out.printf("BŁĄD: %s%n", e.getMessage());
                    failed++;
                }
            }
            System.out.printf("%nGotowe: %d zaindeksowanych, %d nieudanych.%n", ok, failed);
        }
    }

    private static void list(Path dataDir) throws Exception {
        try (Database db = Database.open(dataDir);
             Statement st = db.connection().createStatement();
             ResultSet rs = st.executeQuery("""
                     SELECT c.display_name, c.container, c.status, c.file_count,
                            g.root_path,
                            COALESCE(g.engine_override, g.engine_detected) AS engine,
                            MAX(CASE WHEN d.field = 'edition' THEN d.value END) AS edition,
                            MAX(CASE WHEN d.field = 'family'  THEN d.value END) AS family
                     FROM copy c
                     LEFT JOIN game_root g ON g.copy_id = c.id
                     LEFT JOIN detection d ON d.copy_id = c.id
                                          AND d.root_path = COALESCE(g.root_path, '')
                     GROUP BY c.id, g.id
                     ORDER BY family, edition, c.display_name, g.root_path
                     """)) {

            System.out.printf("%-40s %-10s %-10s %-13s %-22s %s%n",
                    "KOPIA", "STATUS", "KORZEŃ", "SILNIK", "RODZINA", "WYDANIE");
            while (rs.next()) {
                String root = rs.getString("root_path");
                System.out.printf("%-40s %-10s %-10s %-13s %-22s %s%n",
                        truncate(rs.getString("display_name"), 40),
                        rs.getString("status"),
                        root == null ? "—" : (root.isEmpty() ? "/" : root + "/"),
                        nvl(rs.getString("engine")),
                        nvl(rs.getString("family")),
                        nvl(rs.getString("edition")));
            }
        }
    }

    private static void stats(Path dataDir) throws Exception {
        try (Database db = Database.open(dataDir);
             Statement st = db.connection().createStatement()) {

            query(st, "kopie", "SELECT COUNT(*) FROM copy");
            query(st, "pliki (wystąpienia)", "SELECT COUNT(*) FROM file");
            query(st, "bloby (unikalne)", "SELECT COUNT(*) FROM blob");
            query(st, "bloby współdzielone przez >1 kopię",
                    "SELECT COUNT(*) FROM (SELECT blob_sha1 FROM file GROUP BY blob_sha1 "
                            + "HAVING COUNT(DISTINCT copy_id) > 1)");
            query(st, "zaszyfrowane skrypty", "SELECT COUNT(*) FROM blob WHERE encrypted = 1");

            System.out.println("\nFormaty:");
            try (ResultSet rs = st.executeQuery(
                    "SELECT format, COUNT(*) n, SUM(size) bytes FROM blob "
                            + "GROUP BY format ORDER BY n DESC LIMIT 15")) {
                while (rs.next()) {
                    System.out.printf("  %-8s %6d  %8.1f MB%n",
                            nvl(rs.getString("format")), rs.getInt("n"),
                            rs.getLong("bytes") / 1024.0 / 1024.0);
                }
            }
        }
    }

    private static void query(Statement st, String label, String sql) throws Exception {
        try (ResultSet rs = st.executeQuery(sql)) {
            System.out.printf("%-38s %d%n", label + ":", rs.getLong(1));
        }
    }

    private static String nvl(String value) {
        return value == null ? "—" : value;
    }

    private static String truncate(String value, int max) {
        if (value == null) {
            return "—";
        }
        return value.length() <= max ? value : value.substring(0, max - 1) + "…";
    }

    private static void usage() {
        System.out.println("""
                rex-catalog — katalog obrazów gier Aidem Media

                  ingest <ścieżka...>   zaindeksuj obraz, katalog gry lub katalog kolekcji
                  list                  wypisz zaindeksowane kopie
                  stats                 statystyki bazy

                Baza: -Dcatalog.data=<katalog> (domyślnie ./data)
                """);
    }
}