<?php
namespace ProVM\Alias\Database\Query;

use ProVM\Alias\Database\Query;
use ProVM\Concept\Database\Query\Select as SelectInterface;

abstract class Select extends Query implements SelectInterface
{
    public function select(array $columns = ['*']): SelectInterface
    {
        return $this->setColumns($columns);
    }
    public function from(string $table): SelectInterface
    {
        return $this->setTable($table);
    }
    public function joins(array $joins): SelectInterface
    {
        return $this->setJoins($joins);
    }
    public function where(array $conditions): SelectInterface
    {
        return $this->setConditions($conditions);
    }
    public function groupBy(array $grouping): SelectInterface
    {
        return $this->setGroups($grouping);
    }
    public function having(array $having): SelectInterface
    {
        return $this->setHaving($having);
    }
    public function orderBy(array $ordering): SelectInterface
    {
        return $this->setOrders($ordering);
    }

    protected array $columns;
    public function setColumns(array $columns): SelectInterface
    {
        foreach ($columns as $column) {
            $col = $column;
            $alias = null;
            if (is_array($column)) {
                $col = $column['column'] ?? $column[0];
                $alias = $column['alias'] ?? $column[1];
            }
            $this->addColumn($column, $alias);
        }
        return $this;
    }
    public function addColumn(string $column, ?string $alias = null): SelectInterface
    {
        $a = '';
        if ($alias !== null) {
            $a = " AS '{$alias}'";
        }
        $this->columns[] = "`{$column}`{$a}";
        return $this;
    }
    public function getColumns(): array
    {
        return $this->columns;
    }
    public function getColumnString(): string
    {
        return implode(', ', $this->getColumns());
    }
    protected string $table;
    public function setTable(string $table, ?string $alias = null): SelectInterface
    {
        $table = "`{$table}`";
        if ($alias !== null) {
            $table = "{$table} '{$alias}'";
        }
        $this->table = $table;
        return $this;
    }
    public function getTable(): string
    {
        return $this->table;
    }
    protected array $joins;
    public function setJoins(array $joins): SelectInterface
    {
        foreach ($joins as $join) {
            $table = $join['table'] ?? $join[0];
            $expression = $join['expression'] ?? $join[1];
            $this->addJoin($table, $expression);
        }
        return $this;
    }
    public function addJoin(string $table, string $expression): SelectInterface
    {
        $this->joins []= "{$table} ON {$expression}";
        return $this;
    }
    public function getJoins(): array
    {
        return $this->joins;
    }
    public function getJoinString(): string
    {
        return implode(' ', $this->getJoins());
    }
    protected array $conditions;
    public function setConditions(array $conditions): SelectInterface
    {
        foreach ($conditions as $condition) {
            $this->addCondition($condition);
        }
        return $this;
    }
    public function addCondition(string $expression): SelectInterface
    {
        $this->conditions []= $expression;
        return $this;
    }
    public function getConditions(): array
    {
        return $this->conditions;
    }
    public function getConditionString(): string
    {
        return implode(' ', $this->getConditions());
    }
    protected array $groups;
    public function setGroups(array $groups): SelectInterface
    {
        foreach ($groups as $group) {
            $this->addGroup($group);
        }
        return $this;
    }
    public function addGroup(string $group): SelectInterface
    {
        $this->groups []= "`{$group}`";
        return $this;
    }
    public function getGroups(): array
    {
        return $this->groups;
    }
    public function getGroupString(): string
    {
        return implode(', ', $this->getGroups());
    }
    protected array $having;
    public function setHaving(array $having): SelectInterface
    {
        foreach ($having as $item) {
            $this->addHaving($item);
        }
        return $this;
    }
    public function addHaving(string $having): SelectInterface
    {
        $this->having []= $having;
        return $this;
    }
    public function getHaving(): array
    {
        return $this->having;
    }
    public function getHavingString(): string
    {
        return implode(', ', $this->getHaving());
    }
    protected array $orders;
    public function setOrders(array $orders): SelectInterface
    {
        foreach ($orders as $order) {
            $column = $order;
            $direction = null;
            if (is_array($order)) {
                $direction = $order['direction'] ?? $order[1];
                $column = $order['column'] ?? $order[0];
            }
            $this->addOrder($column, $direction);
        }
        return $this;
    }
    public function addOrder(string $column, ?string $direction = null): SelectInterface
    {
        if ($direction === null) {
            $direction = 'ASC';
        }
        $this->orders []= "{$column} {$direction}";
        return $this;
    }
    public function getOrders(): array
    {
        return $this->orders;
    }
    public function getOrderString(): string
    {
        return implode(', ', $this->getOrders());
    }

    public function build(): string
    {
        $query = ["SELECT"];
        $query []= $this->getColumnString();
        $query []= "FROM {$this->getTable()}";
        if (isset($this->joins)) {
            $query []= $this->getJoinString();
        }
        if (isset($this->conditions)) {
            $query []= "WHERE {$this->getConditionString()}";
        }
        if (isset($this->groups)) {
            $query []= "GROUP BY {$this->getGroupString()}";
        }
        if (isset($this->having)) {
            $query []= "HAVING {$this->getHavingString()}";
        }
        if (isset($this->orders)) {
            $query []= "ORDER BY {$this->getOrderString()}";
        }
        return implode(' ', $query);
    }
}