using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Data.Sqlite;
using Newtonsoft.Json.Linq;
using SwarmUI.Utils;

namespace Mrleo1nid.SwarmAssistent;

/// <summary>Training datasets, samples, and job metadata in assistent.sqlite.</summary>
public sealed partial class AssistentMemory
{
    public const string KvHfDatasetCache = "hf_dataset_cache";

    void EnsureTrainingSchema()
    {
        Exec(
            """
            CREATE TABLE IF NOT EXISTS train_datasets (
              id TEXT PRIMARY KEY,
              title TEXT NOT NULL DEFAULT '',
              created_at INTEGER NOT NULL,
              updated_at INTEGER NOT NULL,
              meta_json TEXT
            );
            CREATE TABLE IF NOT EXISTS train_samples (
              id TEXT PRIMARY KEY,
              dataset_id TEXT NOT NULL DEFAULT 'default',
              source TEXT NOT NULL DEFAULT 'manual',
              chat_id TEXT,
              persona TEXT,
              pack TEXT,
              hf_repo TEXT,
              messages_json TEXT NOT NULL DEFAULT '[]',
              status TEXT NOT NULL DEFAULT 'draft',
              created_at INTEGER NOT NULL,
              updated_at INTEGER NOT NULL,
              FOREIGN KEY(dataset_id) REFERENCES train_datasets(id) ON DELETE CASCADE
            );
            CREATE INDEX IF NOT EXISTS idx_train_samples_status ON train_samples(status);
            CREATE INDEX IF NOT EXISTS idx_train_samples_dataset ON train_samples(dataset_id);
            CREATE TABLE IF NOT EXISTS train_jobs (
              id TEXT PRIMARY KEY,
              kind TEXT NOT NULL,
              status TEXT NOT NULL DEFAULT 'pending',
              config_json TEXT,
              base_model TEXT,
              output_name TEXT,
              log_path TEXT,
              progress_json TEXT,
              created_at INTEGER NOT NULL,
              updated_at INTEGER NOT NULL,
              finished_at INTEGER
            );
            CREATE INDEX IF NOT EXISTS idx_train_jobs_status ON train_jobs(status);
            """);
        if (!HasColumn("train_samples", "agent_linked"))
        {
            Exec("ALTER TABLE train_samples ADD COLUMN agent_linked INTEGER NOT NULL DEFAULT 0");
        }
        using SqliteCommand cmd = _conn.CreateCommand();
        cmd.CommandText = "INSERT OR IGNORE INTO train_datasets(id, title, created_at, updated_at) VALUES('default', 'Default', $u, $u)";
        cmd.Parameters.AddWithValue("$u", DateTimeOffset.UtcNow.ToUnixTimeMilliseconds());
        cmd.ExecuteNonQuery();
    }

    public List<JObject> ListTrainSamples(string status = null, string persona = null, string datasetId = null, int limit = 200)
    {
        lock (_lock)
        {
            EnsureOpen();
            int take = Math.Clamp(limit, 1, 2000);
            List<string> where = [];
            if (!string.IsNullOrWhiteSpace(status) && !string.Equals(status, "all", StringComparison.OrdinalIgnoreCase))
            {
                where.Add("status = $status");
            }
            if (!string.IsNullOrWhiteSpace(persona) && !string.Equals(persona, "all", StringComparison.OrdinalIgnoreCase))
            {
                where.Add("persona = $persona");
            }
            if (!string.IsNullOrWhiteSpace(datasetId))
            {
                where.Add("dataset_id = $ds");
            }
            bool hasAgentLinked = HasColumn("train_samples", "agent_linked");
            string sql = hasAgentLinked
                ? "SELECT id, dataset_id, source, chat_id, persona, pack, hf_repo, messages_json, status, created_at, updated_at, agent_linked FROM train_samples"
                : "SELECT id, dataset_id, source, chat_id, persona, pack, hf_repo, messages_json, status, created_at, updated_at FROM train_samples";
            if (where.Count > 0)
            {
                sql += " WHERE " + string.Join(" AND ", where);
            }
            sql += " ORDER BY updated_at DESC LIMIT $lim";
            using SqliteCommand cmd = _conn.CreateCommand();
            cmd.CommandText = sql;
            if (where.Any(w => w.Contains("$status")))
            {
                cmd.Parameters.AddWithValue("$status", status.Trim());
            }
            if (where.Any(w => w.Contains("$persona")))
            {
                cmd.Parameters.AddWithValue("$persona", persona.Trim());
            }
            if (where.Any(w => w.Contains("$ds")))
            {
                cmd.Parameters.AddWithValue("$ds", datasetId.Trim());
            }
            cmd.Parameters.AddWithValue("$lim", take);
            List<JObject> list = [];
            using SqliteDataReader r = cmd.ExecuteReader();
            while (r.Read())
            {
                list.Add(ReadTrainSampleRow(r));
            }
            return list;
        }
    }

    static JObject ReadTrainSampleRow(SqliteDataReader r)
    {
        JArray messages = [];
        try
        {
            messages = JArray.Parse(r.GetString(7));
        }
        catch
        {
            // ignore
        }
        bool hasAgentLinked = r.FieldCount > 11;
        return new JObject
        {
            ["id"] = r.GetString(0),
            ["dataset_id"] = r.GetString(1),
            ["source"] = r.GetString(2),
            ["chat_id"] = r.IsDBNull(3) ? null : r.GetString(3),
            ["persona"] = r.IsDBNull(4) ? null : r.GetString(4),
            ["pack"] = r.IsDBNull(5) ? null : r.GetString(5),
            ["hf_repo"] = r.IsDBNull(6) ? null : r.GetString(6),
            ["messages"] = messages,
            ["status"] = r.GetString(8),
            ["createdAt"] = r.GetInt64(9),
            ["updatedAt"] = r.GetInt64(10),
            ["agent_linked"] = hasAgentLinked && !r.IsDBNull(11) && r.GetInt64(11) != 0,
        };
    }

    public JObject GetTrainSample(string id)
    {
        if (string.IsNullOrWhiteSpace(id))
        {
            return null;
        }
        lock (_lock)
        {
            EnsureOpen();
            bool hasAgentLinked = HasColumn("train_samples", "agent_linked");
            string sql = hasAgentLinked
                ? "SELECT id, dataset_id, source, chat_id, persona, pack, hf_repo, messages_json, status, created_at, updated_at, agent_linked FROM train_samples WHERE id = $id LIMIT 1"
                : "SELECT id, dataset_id, source, chat_id, persona, pack, hf_repo, messages_json, status, created_at, updated_at FROM train_samples WHERE id = $id LIMIT 1";
            using SqliteCommand cmd = _conn.CreateCommand();
            cmd.CommandText = sql;
            cmd.Parameters.AddWithValue("$id", id.Trim());
            using SqliteDataReader r = cmd.ExecuteReader();
            return r.Read() ? ReadTrainSampleRow(r) : null;
        }
    }

    public JObject UpsertTrainSample(JObject sample)
    {
        lock (_lock)
        {
            EnsureOpen();
            long now = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds();
            string id = sample["id"]?.ToString()?.Trim();
            if (string.IsNullOrWhiteSpace(id))
            {
                id = $"ts_{now}_{Guid.NewGuid():N}"[..24];
            }
            string datasetId = sample["dataset_id"]?.ToString()?.Trim() ?? "default";
            JArray messages = sample["messages"] as JArray ?? [];
            using SqliteCommand cmd = _conn.CreateCommand();
            cmd.CommandText =
                """
                INSERT INTO train_samples(id, dataset_id, source, chat_id, persona, pack, hf_repo, messages_json, status, created_at, updated_at)
                VALUES($id, $ds, $src, $chat, $persona, $pack, $hf, $msg, $status, $c, $u)
                ON CONFLICT(id) DO UPDATE SET
                  dataset_id = excluded.dataset_id,
                  source = excluded.source,
                  chat_id = excluded.chat_id,
                  persona = excluded.persona,
                  pack = excluded.pack,
                  hf_repo = excluded.hf_repo,
                  messages_json = excluded.messages_json,
                  status = excluded.status,
                  updated_at = excluded.updated_at
                """;
            cmd.Parameters.AddWithValue("$id", id);
            cmd.Parameters.AddWithValue("$ds", datasetId);
            cmd.Parameters.AddWithValue("$src", sample["source"]?.ToString() ?? "manual");
            cmd.Parameters.AddWithValue("$chat", (object)sample["chat_id"]?.ToString() ?? DBNull.Value);
            cmd.Parameters.AddWithValue("$persona", (object)sample["persona"]?.ToString() ?? DBNull.Value);
            cmd.Parameters.AddWithValue("$pack", (object)sample["pack"]?.ToString() ?? DBNull.Value);
            cmd.Parameters.AddWithValue("$hf", (object)sample["hf_repo"]?.ToString() ?? DBNull.Value);
            cmd.Parameters.AddWithValue("$msg", messages.ToString(Newtonsoft.Json.Formatting.None));
            cmd.Parameters.AddWithValue("$status", sample["status"]?.ToString() ?? "draft");
            long created = sample["createdAt"]?.Value<long?>() ?? now;
            cmd.Parameters.AddWithValue("$c", created);
            cmd.Parameters.AddWithValue("$u", now);
            cmd.ExecuteNonQuery();
            return new JObject { ["id"] = id, ["updatedAt"] = now };
        }
    }

    public bool DeleteTrainSample(string id)
    {
        lock (_lock)
        {
            EnsureOpen();
            using SqliteCommand cmd = _conn.CreateCommand();
            cmd.CommandText = "DELETE FROM train_samples WHERE id = $id";
            cmd.Parameters.AddWithValue("$id", id ?? "");
            return cmd.ExecuteNonQuery() > 0;
        }
    }

    public int CountTrainSamples(string status = null)
    {
        lock (_lock)
        {
            EnsureOpen();
            using SqliteCommand cmd = _conn.CreateCommand();
            if (string.IsNullOrWhiteSpace(status) || string.Equals(status, "all", StringComparison.OrdinalIgnoreCase))
            {
                cmd.CommandText = "SELECT COUNT(*) FROM train_samples";
            }
            else
            {
                cmd.CommandText = "SELECT COUNT(*) FROM train_samples WHERE status = $s";
                cmd.Parameters.AddWithValue("$s", status.Trim());
            }
            return Convert.ToInt32(cmd.ExecuteScalar());
        }
    }

    public JObject SaveTrainJob(JObject job)
    {
        lock (_lock)
        {
            EnsureOpen();
            long now = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds();
            string id = job["id"]?.ToString()?.Trim();
            if (string.IsNullOrWhiteSpace(id))
            {
                id = $"tj_{now}_{Guid.NewGuid():N}"[..24];
            }
            using SqliteCommand cmd = _conn.CreateCommand();
            cmd.CommandText =
                """
                INSERT INTO train_jobs(id, kind, status, config_json, base_model, output_name, log_path, progress_json, created_at, updated_at, finished_at)
                VALUES($id, $kind, $status, $cfg, $base, $out, $log, $prog, $c, $u, $f)
                ON CONFLICT(id) DO UPDATE SET
                  status = excluded.status,
                  config_json = excluded.config_json,
                  log_path = excluded.log_path,
                  progress_json = excluded.progress_json,
                  updated_at = excluded.updated_at,
                  finished_at = excluded.finished_at
                """;
            cmd.Parameters.AddWithValue("$id", id);
            cmd.Parameters.AddWithValue("$kind", job["kind"]?.ToString() ?? "qlora");
            cmd.Parameters.AddWithValue("$status", job["status"]?.ToString() ?? "pending");
            cmd.Parameters.AddWithValue("$cfg", job["config"]?.ToString(Newtonsoft.Json.Formatting.None) ?? job["config_json"]?.ToString() ?? "{}");
            cmd.Parameters.AddWithValue("$base", (object)job["base_model"]?.ToString() ?? DBNull.Value);
            cmd.Parameters.AddWithValue("$out", (object)job["output_name"]?.ToString() ?? DBNull.Value);
            cmd.Parameters.AddWithValue("$log", (object)job["log_path"]?.ToString() ?? DBNull.Value);
            cmd.Parameters.AddWithValue("$prog", (object)job["progress"]?.ToString(Newtonsoft.Json.Formatting.None) ?? job["progress_json"]?.ToString() ?? DBNull.Value);
            cmd.Parameters.AddWithValue("$c", job["created_at"]?.Value<long?>() ?? job["createdAt"]?.Value<long?>() ?? now);
            cmd.Parameters.AddWithValue("$u", now);
            cmd.Parameters.AddWithValue("$f", (object)(job["finished_at"]?.Value<long?>() ?? job["finishedAt"]?.Value<long?>()) ?? DBNull.Value);
            cmd.ExecuteNonQuery();
            return new JObject { ["id"] = id };
        }
    }

    public JObject GetTrainJob(string id)
    {
        lock (_lock)
        {
            EnsureOpen();
            using SqliteCommand cmd = _conn.CreateCommand();
            cmd.CommandText = "SELECT id, kind, status, config_json, base_model, output_name, log_path, progress_json, created_at, updated_at, finished_at FROM train_jobs WHERE id = $id";
            cmd.Parameters.AddWithValue("$id", id ?? "");
            using SqliteDataReader r = cmd.ExecuteReader();
            if (!r.Read())
            {
                return null;
            }
            return new JObject
            {
                ["id"] = r.GetString(0),
                ["kind"] = r.GetString(1),
                ["status"] = r.GetString(2),
                ["config_json"] = r.IsDBNull(3) ? null : r.GetString(3),
                ["base_model"] = r.IsDBNull(4) ? null : r.GetString(4),
                ["output_name"] = r.IsDBNull(5) ? null : r.GetString(5),
                ["log_path"] = r.IsDBNull(6) ? null : r.GetString(6),
                ["progress_json"] = r.IsDBNull(7) ? null : r.GetString(7),
                ["created_at"] = r.GetInt64(8),
                ["updated_at"] = r.GetInt64(9),
                ["finished_at"] = r.IsDBNull(10) ? null : r.GetInt64(10),
            };
        }
    }

    public JObject GetActiveTrainJob()
    {
        lock (_lock)
        {
            EnsureOpen();
            using SqliteCommand cmd = _conn.CreateCommand();
            cmd.CommandText = "SELECT id, kind, status, config_json, base_model, output_name, log_path, progress_json, created_at, updated_at, finished_at FROM train_jobs WHERE status IN ('pending','running') ORDER BY updated_at DESC LIMIT 1";
            using SqliteDataReader r = cmd.ExecuteReader();
            if (!r.Read())
            {
                return null;
            }
            return new JObject
            {
                ["id"] = r.GetString(0),
                ["kind"] = r.GetString(1),
                ["status"] = r.GetString(2),
                ["config_json"] = r.IsDBNull(3) ? null : r.GetString(3),
                ["base_model"] = r.IsDBNull(4) ? null : r.GetString(4),
                ["output_name"] = r.IsDBNull(5) ? null : r.GetString(5),
                ["log_path"] = r.IsDBNull(6) ? null : r.GetString(6),
                ["progress_json"] = r.IsDBNull(7) ? null : r.GetString(7),
                ["created_at"] = r.GetInt64(8),
                ["updated_at"] = r.GetInt64(9),
                ["finished_at"] = r.IsDBNull(10) ? null : r.GetInt64(10),
            };
        }
    }
}