import os
import db.sqlite
import db.mysql
import db.pg

// The goal of this example, is to show how you can connect to
// several different databases in the same program, and use both
// the ORM and the native connection wrapper, that each DB driver
// provides, if you need to execute more complex SQL queries.
//
// You can use environment variables to pass your local DB connection
// settings, without editing the code, like this:
//
//    MUSER='myuser' MPASS='abc' MDATABASE='vtestdb'  PGUSER='postgres' PGPASS='password' PGDATABASE='postgres'  ./v -g run examples/database/orm.v
//
// WARNING: this example will drop and re-create any tables named:
//   * modules
//   * User
//   * Parent
//   * Child
// in the passed databases, so it is better to use empty DBs for it.

const (
    mysql_host = os.getenv_opt('MHOST') or { 'localhost' }
    mysql_port = os.getenv_opt('MPORT') or { '3306' }.u32()
    mysql_user = os.getenv_opt('MUSER') or { 'myuser' }
    mysql_pass = os.getenv_opt('MPASS') or { 'abc' }
    mysql_db   = os.getenv_opt('MDATABASE') or { 'test' }
)

const (
    pg_host = os.getenv_opt('PGHOST') or { 'localhost' }
    pg_user = os.getenv_opt('PGUSER') or { 'test' }
    pg_pass = os.getenv_opt('PGPASS') or { 'abc' }
    pg_db   = os.getenv_opt('PGDATABASE') or { 'test' }
)

[table: 'modules']
struct Module {
    id           int    [primary; sql: serial]
    name         string
    nr_downloads int    [sql: u64]
    creator      User
}

struct User {
    id             int    [primary; sql: serial]
    age            u32    [unique: 'user']
    name           string [sql: 'username'; sql_type: 'VARCHAR(200)'; unique]
    is_customer    bool   [sql: 'abc'; unique: 'user']
    skipped_string string [skip]
}

struct Parent {
    id       int     [primary; sql: serial]
    name     string
    children []Child [fkey: 'parent_id']
}

struct Child {
    id        int    [primary; sql: serial]
    parent_id int
    name      string
}

fn sqlite3_array() ! {
    eprintln('------------ ${@METHOD} -----------------')
    mut db := sqlite.connect(':memory:')!
    defer {
        sql db {
            drop table Parent
            drop table Child
        } or {}
        db.close() or {}
    }

    sql db {
        create table Parent
    }!
    sql db {
        create table Child
    }!
    par := Parent{
        name: 'test'
        children: [
            Child{
                name: 'abc'
            },
            Child{
                name: 'def'
            },
        ]
    }
    sql db {
        insert par into Parent
    }!
    parent := sql db {
        select from Parent where id == 1
    }!
    eprintln(parent)
}

fn msql_array() ! {
    eprintln('------------ ${@METHOD} -----------------')
    mut db := mysql.connect(
        host: mysql_host
        port: mysql_port
        username: mysql_user
        password: mysql_pass
        dbname: mysql_db
    )!
    defer {
        sql db {
            drop table Parent
        } or {}
        db.close()
    }

    db.query('drop table if exists Parent')!
    db.query('drop table if exists Child')!
    sql db {
        create table Parent
        create table Child
    }!
    par := Parent{
        name: 'test'
        children: [
            Child{
                name: 'abc'
            },
            Child{
                name: 'def'
            },
        ]
    }
    sql db {
        insert par into Parent
    }!
    parent := sql db {
        select from Parent where id == 1
    }!
    eprintln(parent)
}

fn psql_array() ! {
    eprintln('------------ ${@METHOD} -----------------')
    mut db := pg.connect(host: pg_host, user: pg_user, password: pg_pass, dbname: pg_db)!
    defer {
        db.exec_one('drop table if exists "Parent", "Child"') or { eprintln(err) }
        db.close()
    }
    db.exec_one('drop table if exists "Parent", "Child"') or { eprintln(err) }

    sql db {
        create table Parent
        create table Child
    }!
    par := Parent{
        name: 'test'
        children: [
            Child{
                name: 'abc'
            },
            Child{
                name: 'def'
            },
        ]
    }
    sql db {
        insert par into Parent
    }!
    parent := sql db {
        select from Parent where id == 1
    }!
    eprintln(parent)
}

fn sqlite3() ! {
    eprintln('------------ ${@METHOD} -----------------')
    mut db := sqlite.connect(':memory:')!
    defer {
        sql db {
            drop table Module
            drop table User
        } or {}
        db.close() or {}
    }

    sql db {
        create table Module
    }!
    sql db {
        create table User
    }!
    mod := Module{
        name: 'test'
        nr_downloads: 10
        creator: User{
            age: 21
            name: 'VUser'
            is_customer: true
        }
    }
    sql db {
        insert mod into Module
    }!
    modul := sql db {
        select from Module where id == 1
    }!
    eprintln(modul)
}

fn msql() ! {
    eprintln('------------ ${@METHOD} -----------------')
    mut conn := mysql.connect(
        host: mysql_host
        port: mysql_port
        username: mysql_user
        password: mysql_pass
        dbname: mysql_db
    )!
    defer {
        conn.query('DROP TABLE IF EXISTS Module') or { eprintln(err) }
        conn.query('DROP TABLE IF EXISTS User') or { eprintln(err) }
        conn.close()
    }
    conn.query('DROP TABLE IF EXISTS Module') or { eprintln(err) }
    conn.query('DROP TABLE IF EXISTS User') or { eprintln(err) }

    sql conn {
        create table Module
    }!
    sql conn {
        create table User
    }!
    mod := Module{
        name: 'test'
        nr_downloads: 10
        creator: User{
            age: 21
            name: 'VUser'
            is_customer: true
        }
    }
    sql conn {
        insert mod into Module
    }!
    m := sql conn {
        select from Module where id == 1
    }!
    eprintln(m)
}

fn psql() ! {
    eprintln('------------ ${@METHOD} -----------------')
    mut db := pg.connect(host: pg_host, user: pg_user, password: pg_pass, dbname: pg_db)!
    defer {
        db.exec_one('drop table if exists "modules", "User"') or { eprintln(err) }
        db.close()
    }
    db.exec_one('drop table if exists "modules", "User"') or { eprintln(err) }
    sql db {
        create table Module
        create table User
    }!
    mod := Module{
        name: 'test'
        nr_downloads: 10
        creator: User{
            age: 21
            name: 'VUser'
            is_customer: true
        }
    }
    sql db {
        insert mod into Module
    }!
    modul := sql db {
        select from Module where id == 1
    }!
    sql db {
        drop table Module
    }!
    eprintln(modul)
}

fn main() {
    eprintln('------------ ${@METHOD} -----------------')
    sqlite3_array()!
    msql_array()!
    psql_array()!

    sqlite3()!
    msql()!
    psql()!
}