use crate::create_connection;
use crate::worker::PgQueue;
use crate::ErrConv;
use err::Error;
use netpod::log::*;
use netpod::ChannelArchiver;
use netpod::ChannelSearchQuery;
use netpod::ChannelSearchResult;
use netpod::ChannelSearchSingleResult;
use netpod::Database;
use netpod::NodeConfigCached;
use netpod::ScalarType;
use netpod::Shape;
use serde_json::Value as JsVal;
use tokio_postgres::Client as PgClient;

pub async fn search_channel_databuffer(
    query: ChannelSearchQuery,
    backend: &str,
    node_config: &NodeConfigCached,
) -> Result<ChannelSearchResult, Error> {
    let empty = if !query.name_regex.is_empty() {
        false
    } else if !query.source_regex.is_empty() {
        false
    } else if !query.description_regex.is_empty() {
        false
    } else {
        true
    };
    if empty {
        let ret = ChannelSearchResult { channels: Vec::new() };
        return Ok(ret);
    }
    let sql = concat!(
        "select",
        " channel_id, channel_name, source_name,",
        " dtype, shape, unit, description, channel_backend",
        " from searchext($1, $2, $3, $4)",
        " where channel_backend = $5"
    );
    let (pg, _pgjh) = create_connection(&node_config.node_config.cluster.database).await?;
    let rows = pg
        .query(
            sql,
            &[
                &query.name_regex,
                &query.source_regex,
                &query.description_regex,
                &"asc",
                &backend,
            ],
        )
        .await
        .err_conv()?;
    let mut res = Vec::new();
    for row in rows {
        let shapedb: Option<serde_json::Value> = row.get(4);
        let shape = match &shapedb {
            Some(top) => match top {
                serde_json::Value::Null => Vec::new(),
                serde_json::Value::Array(items) => {
                    let mut a = Vec::new();
                    for item in items {
                        match item {
                            serde_json::Value::Number(n) => match n.as_i64() {
                                Some(n) => {
                                    a.push(n as u32);
                                }
                                None => return Err(Error::with_msg(format!("can not understand shape {:?}", shapedb))),
                            },
                            _ => return Err(Error::with_msg(format!("can not understand shape {:?}", shapedb))),
                        }
                    }
                    a
                }
                _ => return Err(Error::with_msg(format!("can not understand shape {:?}", shapedb))),
            },
            None => Vec::new(),
        };
        let ty: String = row.get(3);
        let k = ChannelSearchSingleResult {
            backend: row.get(7),
            name: row.get(1),
            series: row.get::<_, i64>(0) as u64,
            source: row.get(2),
            ty,
            shape: shape,
            unit: row.get(5),
            description: row.get(6),
            is_api_0: None,
        };
        res.push(k);
    }
    let res = if let Some(backend) = query.backend.as_ref() {
        res.into_iter().filter(|x| x.backend == *backend).collect()
    } else {
        res
    };
    let ret = ChannelSearchResult { channels: res };
    Ok(ret)
}

pub(super) async fn search_channel_scylla(
    query: ChannelSearchQuery,
    pgc: &PgClient,
) -> Result<ChannelSearchResult, Error> {
    let empty = if !query.name_regex.is_empty() { false } else { true };
    if empty {
        let ret = ChannelSearchResult { channels: Vec::new() };
        return Ok(ret);
    }
    let ch_kind: i16 = query.kind.to_db_i16();
    let (cb1, cb2) = if let Some(x) = query.backend.as_ref() {
        (false, x.as_str())
    } else {
        (false, "----------")
    };
    let regop = if query.icase { "~*" } else { "~" };
    let sql = &format!(
        concat!(
            "select",
            " series, facility, channel, scalar_type, shape_dims",
            " from series_by_channel",
            " where kind = $1",
            " and channel {} $2",
            " and ($3 or facility = $4)",
            " limit 400000",
        ),
        regop
    );
    let params: &[&(dyn tokio_postgres::types::ToSql + Sync)] = &[&ch_kind, &query.name_regex, &cb1, &cb2];
    info!("search_channel_scylla  {:?}", params);
    let rows = pgc.query(sql, params).await.err_conv()?;
    let mut res = Vec::new();
    for row in rows {
        let series: i64 = row.get(0);
        let series = series as u64;
        let backend: String = row.get(1);
        let channel: String = row.get(2);
        let a: i32 = row.get(3);
        // TODO count the failure cases
        if let Ok(scalar_type) = ScalarType::from_scylla_i32(a) {
            let a: Vec<i32> = row.get(4);
            if let Ok(shape) = Shape::from_scylla_shape_dims(&a) {
                let k = ChannelSearchSingleResult {
                    backend,
                    name: channel,
                    series,
                    source: "".into(),
                    ty: scalar_type.to_variant_str().into(),
                    shape: shape.to_scylla_vec().into_iter().map(|x| x as u32).collect(),
                    unit: "".into(),
                    description: "".into(),
                    is_api_0: None,
                };
                res.push(k);
            } else {
                netpod::log::warn!("unknown shape {a:?}");
            }
        } else {
            netpod::log::warn!("unknown scalar_type {a:?}");
        }
    }
    let ret = ChannelSearchResult { channels: res };
    Ok(ret)
}

async fn search_channel_archeng(
    query: ChannelSearchQuery,
    backend: String,
    _conf: &ChannelArchiver,
    database: &Database,
) -> Result<ChannelSearchResult, Error> {
    // Channel archiver provides only channel name. Also, search criteria are currently ANDed.
    // Therefore search only if user only provides a name criterion.
    let empty = if !query.source_regex.is_empty() {
        true
    } else if !query.description_regex.is_empty() {
        true
    } else if query.name_regex.is_empty() {
        true
    } else {
        false
    };
    if empty {
        let ret = ChannelSearchResult { channels: Vec::new() };
        return Ok(ret);
    }
    let sql = format!(concat!(
        "select c.name, c.config",
        " from channels c",
        " where c.name ~* $1",
        " order by c.name",
        " limit 100"
    ));
    let (cl, _pgjh) = create_connection(database).await?;
    let rows = cl.query(sql.as_str(), &[&query.name_regex]).await.err_conv()?;
    let mut res = Vec::new();
    for row in rows {
        let name: String = row.get(0);
        let config: JsVal = row.get(1);
        let st = match config.get("scalarType") {
            Some(k) => match k {
                JsVal::String(k) => match k.as_str() {
                    "U8" => "Uint8",
                    "U16" => "Uint16",
                    "U32" => "Uint32",
                    "U64" => "Uint64",
                    "I8" => "Int8",
                    "I16" => "Int16",
                    "I32" => "Int32",
                    "I64" => "Int64",
                    "F32" => "Float32",
                    "F64" => "Float64",
                    _ => k,
                }
                .into(),
                _ => "",
            },
            None => "",
        };
        let shape = match config.get("shape") {
            Some(k) => match k {
                JsVal::String(k) => {
                    if k == "Scalar" {
                        Vec::new()
                    } else {
                        return Err(Error::with_msg_no_trace(format!(
                            "search_channel_archeng can not understand {:?}",
                            config
                        )));
                    }
                }
                JsVal::Object(k) => match k.get("Wave") {
                    Some(k) => match k {
                        JsVal::Number(k) => {
                            vec![k.as_i64().unwrap_or(u32::MAX as i64) as u32]
                        }
                        _ => {
                            return Err(Error::with_msg_no_trace(format!(
                                "search_channel_archeng can not understand {:?}",
                                config
                            )));
                        }
                    },
                    None => {
                        return Err(Error::with_msg_no_trace(format!(
                            "search_channel_archeng can not understand {:?}",
                            config
                        )));
                    }
                },
                _ => {
                    return Err(Error::with_msg_no_trace(format!(
                        "search_channel_archeng can not understand {:?}",
                        config
                    )));
                }
            },
            None => Vec::new(),
        };
        let k = ChannelSearchSingleResult {
            backend: backend.clone(),
            name,
            // TODO provide a unique id also within this backend:
            series: 0,
            source: String::new(),
            ty: st.into(),
            shape,
            unit: String::new(),
            description: String::new(),
            is_api_0: None,
        };
        res.push(k);
    }
    let ret = ChannelSearchResult { channels: res };
    Ok(ret)
}

pub async fn search_channel(
    query: ChannelSearchQuery,
    pgqueue: &PgQueue,
    ncc: &NodeConfigCached,
) -> Result<ChannelSearchResult, Error> {
    let backend = &ncc.node_config.cluster.backend;
    let pgconf = &ncc.node_config.cluster.database;
    let mut query = query;
    query.backend = Some(backend.into());
    if let Some(_scyconf) = ncc.node_config.cluster.scylla_st() {
        pgqueue
            .search_channel_scylla(query)
            .await
            .map_err(|e| Error::with_msg_no_trace(format!("db worker error {e}")))?
        // search_channel_scylla(query, backend, pgconf).await
    } else if let Some(conf) = ncc.node.channel_archiver.as_ref() {
        search_channel_archeng(query, backend.clone(), conf, pgconf).await
    } else if let Some(_conf) = ncc.node.archiver_appliance.as_ref() {
        // TODO
        err::todoval()
    } else {
        search_channel_databuffer(query, backend, ncc).await
    }
}