using Microsoft.Data.Sqlite;

namespace MoShiro.Backend.Storage.Sqlite;

/// <summary>
/// 表结构。版本记录在 <c>PRAGMA user_version</c>。版本 1 到 2 只改了 Kind 的名字（见 <see cref="RenameKinds"/>）；
/// 其他版本的数据库（包括更早的构建留下的）不会被迁移，启动时报错，删除 <c>moshiro.db</c> 和 <c>raw/</c> 之后重新开始。以后的结构变更按版本号追加内置 SQL。
/// </summary>
internal static class Schema
{
    public const int CurrentVersion = 2;

    public static void Migrate(SqliteConnection connection)
    {
        int version = connection.Scalar<int>("PRAGMA user_version");
        if (version == CurrentVersion)
        {
            return;
        }

        if (version == 1)
        {
            using SqliteTransaction upgrade = connection.BeginTransaction();
            foreach ((string from, string to) in RenameKinds)
            {
                connection.Exec($"UPDATE tasks SET kind = '{to}' WHERE kind = '{from}'");
                connection.Exec($"UPDATE raw_chunks SET kind = '{to}' WHERE kind = '{from}'");
                connection.Exec($"UPDATE tests SET plan = REPLACE(plan, '\"{from}\"', '\"{to}\"')");
            }

            connection.Exec("PRAGMA user_version = 2");
            upgrade.Commit();
            return;
        }

        if (version != 0)
        {
            throw new InvalidOperationException($"database schema version {version} is not supported by this build (expected {CurrentVersion}); delete moshiro.db and the raw/ directory to start over");
        }

        using SqliteTransaction transaction = connection.BeginTransaction();
        connection.Exec(V1);
        connection.Exec("PRAGMA user_version = 2");
        transaction.Commit();
    }

    /// <summary>版本 2：Kind 改成「协议 + 做什么」的名字。任务和原始数据索引跟着改；已经落盘的原始块头里还是旧名字，按旧名字解不出指标，重算不到它们，已经算好的指标不受影响。</summary>
    private static readonly (string From, string To)[] RenameKinds =
    [
        ("udp_echo", "quic_ping"), ("tcp_echo", "tcp_ping"), ("udp_train", "quic_stream"), ("tcp_bulk", "tcp_transfer"),
        ("connect", "tcp_connect"), ("hold", "tls_hold"), ("icmp_echo", "icmp_ping"),
    ];

    /// <summary>
    /// 新增 Kind 或指标都不需要改表结构：指标是 <c>metric_*.metrics</c> 里的一个键，Kind 只是 <c>raw_chunks.kind</c> 的一个取值。
    /// 节点只有一张表（<c>agents</c>）：监听的节点有地址和端口，不监听的节点只拨出。线路 <c>(agent_id, series)</c> 里的 agent_id 是监听方，series 里是拨号方。
    /// </summary>
    private const string V1 = """
        CREATE TABLE agents (
          id TEXT PRIMARY KEY,
          name TEXT NOT NULL,
          status TEXT NOT NULL,
          pubkey BLOB NOT NULL,
          tls_spki BLOB NOT NULL,
          tls_pubkey BLOB NOT NULL,
          listens INTEGER NOT NULL DEFAULT 0,
          public_host TEXT NOT NULL DEFAULT '',
          tcp_port INTEGER NOT NULL DEFAULT 0,
          quic_ports TEXT NOT NULL DEFAULT '[]',
          ipv6_host TEXT NOT NULL DEFAULT '',
          ipv6_supported INTEGER NOT NULL DEFAULT 0,
          ipv6_diagnostics TEXT,
          public_host_manual INTEGER NOT NULL DEFAULT 0,
          ipv6_host_manual INTEGER NOT NULL DEFAULT 0,
          reported_addresses TEXT NOT NULL DEFAULT '[]',
          labels TEXT NOT NULL DEFAULT '[]',
          public_visible INTEGER NOT NULL DEFAULT 1,
          kinds TEXT NOT NULL DEFAULT '[]',
          agent_version TEXT,
          local_limits TEXT,
          task_version INTEGER NOT NULL DEFAULT 0,
          applied_task_version INTEGER NOT NULL DEFAULT 0,
          rejected TEXT,
          task_hash TEXT,
          meta TEXT,
          added_by TEXT,
          created_at INTEGER NOT NULL,
          last_seen_at INTEGER,
          row_version INTEGER NOT NULL DEFAULT 0
        );

        CREATE TABLE analysis_queue (
          agent_id TEXT NOT NULL,
          series TEXT NOT NULL,
          window_start INTEGER NOT NULL,
          not_before INTEGER NOT NULL,
          reason TEXT NOT NULL,
          seq INTEGER NOT NULL DEFAULT 1,
          PRIMARY KEY (agent_id, series, window_start)
        ) WITHOUT ROWID;

        CREATE TABLE api_tokens (
          id TEXT PRIMARY KEY,
          name TEXT NOT NULL,
          capabilities TEXT NOT NULL,
          token_sha256 BLOB NOT NULL UNIQUE,
          created_at INTEGER NOT NULL,
          last_used_at INTEGER,
          expires_at INTEGER,
          revoked_at INTEGER
        );

        CREATE TABLE audit_log (
          id INTEGER PRIMARY KEY,
          at INTEGER NOT NULL,
          user_id TEXT,
          actor TEXT NOT NULL,
          method TEXT NOT NULL,
          action TEXT NOT NULL,
          target TEXT,
          detail TEXT,
          remote TEXT,
          success INTEGER NOT NULL
        );

        CREATE TABLE events (
          id INTEGER PRIMARY KEY,
          agent_id TEXT,
          kind TEXT NOT NULL,
          at INTEGER NOT NULL,
          detail TEXT
        );

        CREATE TABLE host_samples (
          agent_id TEXT NOT NULL,
          at INTEGER NOT NULL,
          cpu REAL,
          mem_used INTEGER,
          mem_total INTEGER,
          disk_used INTEGER,
          disk_total INTEGER,
          net_rx_bps INTEGER,
          net_tx_bps INTEGER,
          uptime INTEGER,
          PRIMARY KEY (agent_id, at)
        ) WITHOUT ROWID;

        CREATE TABLE join_tokens (
          id TEXT PRIMARY KEY,
          token_sha256 BLOB NOT NULL UNIQUE,
          note TEXT,
          labels TEXT NOT NULL DEFAULT '[]',
          auto_approve INTEGER NOT NULL,
          max_uses INTEGER NOT NULL,
          uses INTEGER NOT NULL DEFAULT 0,
          expires_at INTEGER NOT NULL,
          revoked_at INTEGER,
          created_at INTEGER NOT NULL,
          kind TEXT NOT NULL DEFAULT '',
          created_by TEXT
        );

        CREATE TABLE metric_10s (agent_id TEXT NOT NULL, series TEXT NOT NULL, window_start INTEGER NOT NULL, partial INTEGER NOT NULL, metrics BLOB NOT NULL, PRIMARY KEY (agent_id, series, window_start)) WITHOUT ROWID;

        CREATE TABLE metric_1h  (agent_id TEXT NOT NULL, series TEXT NOT NULL, window_start INTEGER NOT NULL, partial INTEGER NOT NULL, metrics BLOB NOT NULL, PRIMARY KEY (agent_id, series, window_start)) WITHOUT ROWID;

        CREATE TABLE metric_1m  (agent_id TEXT NOT NULL, series TEXT NOT NULL, window_start INTEGER NOT NULL, partial INTEGER NOT NULL, metrics BLOB NOT NULL, PRIMARY KEY (agent_id, series, window_start)) WITHOUT ROWID;

        CREATE TABLE metric_5m  (agent_id TEXT NOT NULL, series TEXT NOT NULL, window_start INTEGER NOT NULL, partial INTEGER NOT NULL, metrics BLOB NOT NULL, PRIMARY KEY (agent_id, series, window_start)) WITHOUT ROWID;

        CREATE TABLE metric_versions (
          metric_id TEXT PRIMARY KEY,
          fingerprint TEXT NOT NULL,
          recompute_from INTEGER,
          recompute_cursor INTEGER
        );

        CREATE TABLE node_meta (
          node_id TEXT PRIMARY KEY,
          os TEXT,
          os_name TEXT,
          arch TEXT,
          country TEXT,
          isp_key TEXT,
          isp_name TEXT,
          isp_manual INTEGER NOT NULL DEFAULT 0,
          geo_host TEXT,
          geo_at INTEGER NOT NULL DEFAULT 0,
          version TEXT,
          tag TEXT,
          commit_id TEXT,
          built_at TEXT,
          updated_at INTEGER NOT NULL DEFAULT 0
        ) WITHOUT ROWID;

        CREATE TABLE operator_sets (
          version INTEGER PRIMARY KEY,
          statement TEXT NOT NULL,
          credential_id TEXT NOT NULL,
          authenticator_data TEXT NOT NULL,
          client_data_json TEXT NOT NULL,
          signature TEXT NOT NULL,
          created_at INTEGER NOT NULL
        );

        CREATE TABLE passkeys (
          id TEXT PRIMARY KEY,
          user_id TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
          name TEXT NOT NULL,
          public_key BLOB NOT NULL,
          sign_count INTEGER NOT NULL DEFAULT 0,
          transports TEXT NOT NULL DEFAULT '[]',
          created_at INTEGER NOT NULL,
          last_used_at INTEGER
        );

        CREATE TABLE raw_chunks (
          chunk_id TEXT PRIMARY KEY,
          segment_id INTEGER NOT NULL REFERENCES raw_segments(id),
          offset INTEGER NOT NULL,
          length INTEGER NOT NULL,
          agent_id TEXT NOT NULL,
          series TEXT NOT NULL,
          kind TEXT NOT NULL,
          task_id TEXT,
          test_id TEXT,
          phase INTEGER,
          start_ts INTEGER NOT NULL,
          duration_ms INTEGER NOT NULL,
          partial INTEGER NOT NULL
        ) WITHOUT ROWID;

        CREATE TABLE raw_segments (
          id INTEGER PRIMARY KEY,
          day TEXT NOT NULL,
          path TEXT NOT NULL UNIQUE,
          bytes INTEGER NOT NULL DEFAULT 0
        );

        CREATE TABLE rollup_dirty (
          level INTEGER NOT NULL,
          agent_id TEXT NOT NULL,
          series TEXT NOT NULL,
          bucket_start INTEGER NOT NULL,
          PRIMARY KEY (level, agent_id, series, bucket_start)
        ) WITHOUT ROWID;

        CREATE TABLE sessions (
          id_sha256 BLOB PRIMARY KEY,
          user_id TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
          csrf_token BLOB NOT NULL,
          auth_method TEXT NOT NULL DEFAULT 'password',
          created_at INTEGER NOT NULL,
          expires_at INTEGER NOT NULL
        );

        CREATE TABLE settings (key TEXT PRIMARY KEY, value TEXT NOT NULL);

        CREATE TABLE tasks (
          id TEXT PRIMARY KEY,
          scope TEXT NOT NULL,
          agent_id TEXT REFERENCES agents(id) ON DELETE CASCADE,
          base_task_id TEXT REFERENCES tasks(id) ON DELETE CASCADE,
          kind TEXT NOT NULL,
          target TEXT,
          params TEXT NOT NULL DEFAULT '{}',
          schedule TEXT NOT NULL,
          enabled INTEGER NOT NULL DEFAULT 1,
          updated_at INTEGER NOT NULL,
          row_version INTEGER NOT NULL DEFAULT 0
        );

        CREATE TABLE test_results (
          test_id TEXT PRIMARY KEY,
          metrics BLOB NOT NULL,
          series BLOB NOT NULL
        ) WITHOUT ROWID;

        CREATE TABLE tests (
          id TEXT PRIMARY KEY,
          agent_id TEXT NOT NULL,
          dialer_id TEXT NOT NULL,
          ip_version TEXT NOT NULL DEFAULT 'ipv4',
          plan TEXT NOT NULL,
          params TEXT NOT NULL,
          trigger TEXT NOT NULL,
          status TEXT NOT NULL,
          error_code TEXT,
          phase INTEGER,
          phase_count INTEGER NOT NULL DEFAULT 0,
          requested_at INTEGER NOT NULL,
          started_at INTEGER,
          finished_at INTEGER
        );

        CREATE TABLE users (
          id TEXT PRIMARY KEY,
          username TEXT NOT NULL UNIQUE,
          password_hash BLOB NOT NULL,
          password_salt BLOB NOT NULL,
          iterations INTEGER NOT NULL,
          created_at INTEGER NOT NULL
        );

        CREATE INDEX ix_audit_time ON audit_log (at);

        CREATE INDEX ix_events_agent ON events (agent_id, at);

        CREATE INDEX ix_events_time ON events (at);

        CREATE INDEX ix_metric_10s_time ON metric_10s (window_start);

        CREATE INDEX ix_metric_1m_time ON metric_1m (window_start);

        CREATE INDEX ix_metric_5m_time ON metric_5m (window_start);

        CREATE INDEX ix_passkeys_user ON passkeys (user_id);

        CREATE INDEX ix_queue_due ON analysis_queue (not_before);

        CREATE INDEX ix_raw_segment ON raw_chunks (segment_id);

        CREATE INDEX ix_raw_series ON raw_chunks (agent_id, series, start_ts);

        CREATE INDEX ix_raw_test ON raw_chunks (test_id) WHERE test_id IS NOT NULL;

        CREATE INDEX ix_tests_agent ON tests (agent_id, requested_at);

        CREATE INDEX ix_tests_path ON tests (agent_id, dialer_id, ip_version, requested_at);

        CREATE UNIQUE INDEX ux_agents_name ON agents (name) WHERE status <> 'pending';
        """;
}