package main

import (
    "fmt"
    "log"

    _ "github.com/lib/pq"
    _ "github.com/mattn/go-sqlite3"
    "github.com/jmoiron/sqlx"
)

func db_get_transactions(transactions *[]Transaction,r *GetTransactionPaginationInput) (error) {
    db, err := sqlx.Connect(DB_TYPE, DB_CONNECTION_STRING)
    if err != nil {
        log.Print("Fatal error in db_get_transactions\nCannot connect to server")
        log.Fatal(err)
    }

    defer db.Close()

    err = db.Select(transactions, 
        "SELECT trns_id, trns_amount, trns_description, " +
        "trns_account, trns_bucket, trns_date " +
        fmt.Sprintf("FROM %stransactions ORDER BY trns_id DESC ", DB_SCHEMA) + 
        fmt.Sprintf("OFFSET %d ROWS FETCH NEXT %d ROWS ONLY",
            r.PageNum, r.ResultCount))
    if err != nil {
        return err
    }
    return nil
}

func db_new_transaction(transaction Transaction) (error) {
    db, err := sqlx.Connect(DB_TYPE, DB_CONNECTION_STRING)
    if err != nil {
        log.Print("Fatal error in db_get_transactions\nCannot connect to server")
        log.Fatal(err)
    }

    defer db.Close()

    _, err = db.NamedQuery(
            fmt.Sprintf("INSERT INTO %stransactions", DB_SCHEMA) + 
            "(trns_amount, trns_description, trns_account, trns_bucket, trns_date)" +
            "VALUES (:trns_amount, :trns_description, :trns_account, :trns_bucket, :trns_date)",
        transaction)
    if err != nil {
        log.Fatal(err)
    }
    return nil
}