<?php
/** @noinspection ALL */

declare(strict_types=1);

namespace Database;


use JetBrains\PhpStorm\Pure;
use Kiri;
use Kiri\Abstracts\Component;
use Database\Traits\QueryTrait;


/**
 * Class SqlBuilder
 * @package Database
 */
class SqlBuilder extends Component
{

    /**
     * @var ActiveQuery|Query|ISqlBuilder|null
     */
    public ActiveQuery|Query|ISqlBuilder|null $query;


    /**
     * @param ActiveQuery|Query|ISqlBuilder|null $config
     */
    public function __construct(ActiveQuery|Query|null|ISqlBuilder $config)
    {
        parent::__construct();

        $this->query = $config;
    }


    /**
     * @param ISqlBuilder|null $query
     * @return $this
     * @throws
     */
    public static function builder(ISqlBuilder|null $query): static
    {
        return new static($query);
    }


    /**
     * @return string
     * @throws
     */
    public function getCondition(): string
    {
        return $this->where($this->query->where);
    }


    /**
     * @param array $compiler
     * @return string
     * @throws
     */
    public function hashCompiler(array $compiler): string
    {
        return $this->where($compiler);
    }


    /**
     * @param array $attributes
     * @return bool|array
     * @throws
     */
    public function update(array $attributes): bool|string
    {
        return $this->__updateBuilder($this->makeParams($attributes));
    }


    /**
     * @param array $attributes
     * @param string $opera
     * @return bool|array
     * @throws
     */
    public function mathematics(array $attributes, string $opera = '+'): bool|string
    {
        $string = [];
        foreach ($attributes as $attribute => $value) {
            $string[] = $attribute . '=' . $attribute . $opera . $value;
        }
        return $this->__updateBuilder($string);
    }


    /**
     * @param array $string
     * @return string|bool
     * @throws
     */
    private function __updateBuilder(array $string): string|bool
    {
        if (empty($string)) {
            return Kiri::getLogger()->logCategory('None data update.');
        }

	    var_dump($string, $this->query);

		$sql = 'UPDATE ' . $this->getFromAlias() . ' SET ' . implode(',', $string) . $this->make();

		var_dump($string, $this);
		return $sql;
    }


    /**
     * @param array $attributes
     * @param false $isBatch
     * @return array
     * @throws
     */
    public function insert(array $attributes, bool $isBatch = false): string
    {
        $update = 'INSERT INTO ' . $this->getFromAlias();
        if ($isBatch === false) {
            $attributes = [$attributes];
        }
        $update .= '(' . implode(',', $this->getFields($attributes)) . ') VALUES ';

        $keys = [];
        foreach ($attributes as $attribute) {
            $_keys = $this->makeParams($attribute, true);

            $keys[] = implode(',', $_keys);
        }
        return $update . '(' . implode('),(', $keys) . ')';
    }


    /**
     * @return string
     * @throws
     */
    public function delete(): string
    {
        return 'DELETE FROM ' . $this->getFromAlias() . $this->make();
    }


    /**
     * @param $attributes
     * @return array
     */
    #[Pure] private function getFields(array $attributes): array
    {
        return array_keys(current($attributes));
    }


    /**
     * @param array $attributes
     * @param bool $isInsert
     * @return array[]
     * a=:b,
     */
    private function makeParams(array $attributes, bool $isInsert = false): array
    {
        $keys = [];
        foreach ($attributes as $key => $value) {
            if ($isInsert === true) {
                $keys[] = '?';
                $this->query->pushParam($value);
            } else {
                $keys = $this->resolveParams($key, $value, $keys);
            }
        }
        return $keys;
    }


    /**
     * @param string $key
     * @param mixed $value
     * @param array $keys
     * @return array
     */
    private function resolveParams(string $key, mixed $value, array $keys): array
    {
        if (is_null($value)) {
            return $keys;
        }
        if (preg_match('/^[+|-]\s\d+$/', (string)$value)) {
            $keys[] = $key . '=' . $key . ' ' . $value;
        } else {
            $this->query->pushParam($value);
            $keys[] = $key . '= ?';
        }
        return $keys;
    }


    /**
     * @return string
     * @throws
     */
    public function one(): string
    {
        $this->query->offset(0)->limit(1);
        return $this->makeSelect($this->query) . $this->make() . $this->makeLimit();
    }


    /**
     * @return string
     * @throws
     */
    public function all(): string
    {
        return $this->makeSelect($this->query) . $this->make() . $this->makeLimit();
    }


    /**
     * @return string
     * @throws
     */
    public function count(): string
    {
        return $this->makeSelect(['COUNT(*)']) . $this->make();
    }


    /**
     * @return string
     * @throws
     */
    public function exists(): string
    {
        return $this->makeSelect(['0']) . $this->make();
    }


    /**
     * @param string $table
     * @return string
     * @throws
     */
    public function columns(string $table): string
    {
        $driver = $this->getDriver();
        if (in_array($driver, ['pgsql', 'postgresql'])) {
            $tableName = trim($table, '"`');
            return "SELECT 
                column_name as Field,
                data_type as Type,
                is_nullable as Null,
                column_default as Default,
                '' as Extra,
                '' as Key
            FROM information_schema.columns 
            WHERE table_name = '$tableName' 
            ORDER BY ordinal_position";
        }
        return 'SHOW FULL FIELDS FROM ' . $table;
    }


    /**
     * @return string
     * @throws
     */
    private function make(): string
    {
        $select = $this->makeCondition();
        $select .= $this->makeGroup();
        $select .= $this->makeOrder();
        return $select;
    }

    /**
     * @param mixed $select 列名数组或 QueryTrait 对象
     * @return string
     */
    private function makeSelect(mixed $select = ['*']): string
    {
        if (!is_array($select)) {
            $select = ['*'];
        }
        $sql = "SELECT " . implode(',', $select) . " FROM " . $this->getFromAlias();
        if ($this->query->join !== []) {
            $sql .= ' ' . implode(' ', $this->query->join);
        }
        return $sql;
    }


    /**
     * @return string
     */
    private function makeGroup(): string
    {
        if ($this->query->group !== '' && $this->query->group !== '0') {
            return ' GROUP BY ' . $this->query->group;
        }
        return '';
    }


    /**
     * @return string
     */
    private function makeOrder(): string
    {
        if (count($this->query->order) > 0) {
            return ' ORDER BY ' . implode(',', $this->query->order);
        }
        return '';
    }


    /**
     * @return string
     */
    private function makeCondition(): string
    {
        $condition = $this->where($this->query->where);
        if (empty($condition)) {
            return '';
        }
        return ' WHERE ' . $condition;
    }


    /**
     * @return string
     * @throws
     */
    private function makeLimit(): string
    {
        if ($this->query->offset >= 0 && $this->query->limit >= 1) {
            $driver = $this->getDriver();
            if (in_array($driver, ['pgsql', 'postgresql'])) {
                return ' LIMIT ' . $this->query->limit . ' OFFSET ' . $this->query->offset;
            }
            return ' LIMIT ' . $this->query->offset . ',' . $this->query->limit;
        }
        return '';
    }


    /**
     * @param false $isCount
     * @return string
     * @throws
     */
    public function get(bool $isCount = false): string
    {
        if ($isCount === false) {
            return $this->all();
        }
        return $this->count();
    }


    /**
     * @return string
     * @throws
     */
    public function truncate(): string
    {
        return sprintf('TRUNCATE %s', $this->getFromAlias());
    }


    /**
     * @param array $where
     * @return string
     */
    private function where(array $where): string
    {
        if (count($where) < 1) {
            return '';
        }
        $_tmp = [];
        foreach ($where as $key => $value) {
            $_tmp[] = $this->resolveCondition($key, $value);
        }
        return implode(' AND ', $_tmp);
    }


    /**
     * @param string $field
     * @param mixed $condition
     * @return string
     */
    private function resolveCondition(string|int $field, mixed $condition): string
    {
        if (is_string($field)) {
            $this->query->pushParam($condition);
            return $field . ' = ?';
        } else if (is_string($condition)) {
            return $condition;
        } else {
            return implode(' AND ', $this->_hashMap($condition));
        }
    }


    /**
     * @param $condition
     * @return array
     */
    private function _hashMap(array $condition): array
    {
        $_array = [];
        foreach ($condition as $key => $value) {
            $this->query->pushParam($value);
            $_array[] = $key . '= ?';
        }
        return $_array;
    }

    /**
     * 获取数据库驱动类型
     * @return string
     * @throws
     */
    private function getDriver(): string
    {
        try {
            if ($this->query instanceof ActiveQuery && $this->query->modelClass !== null) {
                if ($this->query->modelClass instanceof Model) {
                    $connection = $this->query->modelClass->getConnection();
                    if ($connection instanceof Connection) {
                        return strtolower($connection->driver ?? 'mysql');
                    }
                }
            }
            if (method_exists($this->query, 'getConnection')) {
                $connection = $this->query->getConnection();
                if ($connection instanceof Connection) {
                    return strtolower($connection->driver ?? 'mysql');
                }
            }
        } catch (\Throwable $e) {
			$this->getLogger()->json_log($e);
		}
        return 'mysql';
    }


	/**
	 * 获取 FROM 子句（表名 + 别名）
	 * QueryTrait 对象有 $from 和 $alias 属性
	 * @return string
	 */
	private function getFromAlias(): string
	{
		$from = $this->query->from;
		if ($this->query->alias !== '' && $this->query->alias !== '0') {
			$from .= ' AS ' . $this->query->alias;
		}
		return $from;
	}


}