use log::info;

use std::collections::HashMap;

use sqlx::postgres::{
    PgConnectOptions,
    PgPool,
    PgPoolOptions,
};

pub static INSERT_EVENT: &str = "
INSERT INTO
    events
    (
        aggregate_type, 
        aggregate_id,
        sequence,
        payload, 
        metadata
    )
VALUES
    (
        $1,
        $2,
        $3,
        $4,
        $5
    );
";

pub static SELECT_EVENTS_WITH_METADATA: &str = "
SELECT
    sequence,
    payload,
    metadata
FROM
    events
WHERE
    aggregate_type = $1
    AND
    aggregate_id = $2
ORDER BY 
    sequence;
";

pub static UPDATE_EVENTS: &str = "
UPDATE
    events
SET
    payload = $4,
    metadata = $5
WHERE
    aggregate_type = $1
    AND
    aggregate_id = $2
    AND
    sequence = $3;
";

async fn get_pool() -> Result<PgPool, sqlx::Error> {
    // "postgres://demo_user:demo_pass@localhost:8087/demo"
    let options = PgConnectOptions::new()
        .host("localhost")
        .port(8087)
        .database("demo")
        .username("demo_user")
        .password("demo_pass");

    let pool = PgPoolOptions::new()
        .max_connections(5)
        .connect_with(options)
        .await?;

    Ok(pool)
}

async fn test_connect() -> Result<(), sqlx::Error> {
    let pool = get_pool().await?;

    // Make a simple query to return the given parameter
    let row: (i64,) = sqlx::query_as("SELECT $1")
        .bind(150_i64)
        .fetch_one(&pool)
        .await?;

    assert_eq!(row.0, 150);

    info!("Received {}", row.0);
    Ok(())
}

async fn test_insert_select_update() -> Result<(), sqlx::Error> {
    let pool = get_pool().await?;

    // insert
    let mut payload = HashMap::new();
    payload.insert("k".to_string(), "v".to_string());

    let payload = match serde_json::to_value(payload) {
        Ok(x) => x,
        Err(e) => {
            panic!(
                "payload serialization error '{}'",
                e.to_string()
            );
        },
    };

    let mut metadata = HashMap::new();
    metadata.insert("k1".to_string(), "v1".to_string());

    let metadata = match serde_json::to_value(metadata) {
        Ok(x) => x,
        Err(e) => {
            panic!(
                "metadata serialization error '{}'",
                e.to_string()
            );
        },
    };

    let aggregate_type = uuid::Uuid::new_v4().to_string();
    let aggregate_id = uuid::Uuid::new_v4().to_string();

    let rows_affected = sqlx::query(INSERT_EVENT)
        .bind(&aggregate_type)
        .bind(&aggregate_id)
        .bind(1)
        .bind(payload)
        .bind(metadata)
        .execute(&pool)
        .await?
        .rows_affected();

    info!(
        "Insert affected '{}' rows",
        rows_affected
    );

    // select
    let rows: Vec<(
        i64,
        serde_json::Value,
        serde_json::Value,
    )> = sqlx::query_as(SELECT_EVENTS_WITH_METADATA)
        .bind(&aggregate_type)
        .bind(&aggregate_id)
        .fetch_all(&pool)
        .await?;

    info!("select success");

    for row in rows {
        let payload: HashMap<String, String> =
            serde_json::from_value(row.1).unwrap();
        let metadata: HashMap<String, String> =
            serde_json::from_value(row.2).unwrap();
        info!(
            "{},{:?},{:?}",
            &row.0, payload, metadata
        )
    }

    // update
    let mut payload = HashMap::new();
    payload.insert("k2".to_string(), "v2".to_string());

    let payload = match serde_json::to_value(payload) {
        Ok(x) => x,
        Err(e) => {
            panic!(
                "payload serialization error '{}'",
                e.to_string()
            );
        },
    };

    let mut metadata = HashMap::new();
    metadata.insert("k3".to_string(), "v3".to_string());

    let metadata = match serde_json::to_value(metadata) {
        Ok(x) => x,
        Err(e) => {
            panic!(
                "metadata serialization error '{}'",
                e.to_string()
            );
        },
    };

    let rows_affected = sqlx::query(UPDATE_EVENTS)
        .bind(&aggregate_type)
        .bind(&aggregate_id)
        .bind(1)
        .bind(payload)
        .bind(metadata)
        .execute(&pool)
        .await?
        .rows_affected();

    info!(
        "Insert affected '{}' rows",
        rows_affected
    );

    // select
    let rows: Vec<(
        i64,
        serde_json::Value,
        serde_json::Value,
    )> = sqlx::query_as(SELECT_EVENTS_WITH_METADATA)
        .bind(&aggregate_type)
        .bind(&aggregate_id)
        .fetch_all(&pool)
        .await?;

    info!("select success");

    for row in rows {
        let payload: HashMap<String, String> =
            serde_json::from_value(row.1).unwrap();
        let metadata: HashMap<String, String> =
            serde_json::from_value(row.2).unwrap();
        info!(
            "{},{:?},{:?}",
            &row.0, payload, metadata
        )
    }

    Ok(())
}

pub async fn check_postgres() -> Result<(), sqlx::Error> {
    test_connect().await?;
    test_insert_select_update().await?;

    Ok(())
}