<?php

namespace sammo\Constraint;

abstract class Constraint
{
    private function __construct()
    {
    }

    const REQ_GENERAL = 0x10;
    const REQ_CITY = 0x20;
    const REQ_NATION = 0x40;
    const REQ_ARG = 0x80;
    const REQ_DEST_GENERAL = 0x100;
    const REQ_DEST_CITY = 0x200;
    const REQ_DEST_NATION = 0x400;
    const REQ_STRING_ARG = self::REQ_ARG | 0x1000;
    const REQ_INT_ARG = self::REQ_ARG | 0x2000;
    const REQ_NUMERIC_ARG = self::REQ_ARG | 0x4000;
    const REQ_BOOLEAN_ARG = self::REQ_ARG | 0x8000;
    const REQ_ARRAY_ARG = self::REQ_ARG | 0x10000;
    const REQ_BACKED_ENUM_ARG = self::REQ_ARG | 0x20000;

    const REQ_VALUES = 0;

    protected $general = null;
    protected $city = null;
    protected $nation = null;
    protected $arg = null;

    protected $env = null;

    protected $cmd_arg = null;

    protected $destGeneral = null;
    protected $destCity = null;
    protected $destNation = null;

    protected $tested = false;
    protected $reason = null;

    abstract public function test(): bool;


    static public function requiredValueType(): int
    {
        return static::REQ_VALUES;
    }

    public function setGeneral(array $general)
    {
        $this->general = $general;
        $this->tested = false;
        $this->reason = null;
    }
    public function setCity(array $city)
    {
        $this->city = $city;
        $this->tested = false;
        $this->reason = null;
    }
    public function setNation(array $nation)
    {
        $this->nation = $nation;
        $this->tested = false;
        $this->reason = null;
    }
    public function setArg($arg)
    {
        $this->arg = $arg;
        $this->tested = false;
        $this->reason = null;
    }
    public function setEnv($env)
    {
        $this->env = $env;
        $this->tested = false;
        $this->reason = null;
    }
    public function setCmdArg($cmd_arg)
    {
        $this->cmd_arg = $cmd_arg;
        $this->tested = false;
        $this->reason = null;
    }

    public function setDestGeneral(array $general)
    {
        $this->destGeneral = $general;
        $this->tested = false;
        $this->reason = null;
    }
    public function setDestCity(array $city)
    {
        $this->destCity = $city;
        $this->tested = false;
        $this->reason = null;
    }
    public function setDestNation(array $nation)
    {
        $this->destNation = $nation;
        $this->tested = false;
        $this->reason = null;
    }

    static public function build(array $input): self
    {
        $self = new static();
        foreach ($input as $key => $value) {
            if ($value === null) {
                continue;
            }
            switch ($key) {
                case 'general':
                    $self->setGeneral($value);
                    break;
                case 'city':
                    $self->setCity($value);
                    break;
                case 'nation':
                    $self->setNation($value);
                    break;
                case 'cmd_arg':
                    $self->setCmdArg($value);
                    break;

                case 'destGeneral':
                    $self->setDestGeneral($value);
                    break;
                case 'destCity':
                    $self->setDestCity($value);
                    break;
                case 'destNation':
                    $self->setDestNation($value);
                    break;
            }
        }

        return $self;
    }

    public function checkInputValues(bool $throwExeception = true): bool
    {
        $valueType = static::requiredValueType();

        if (($valueType & static::REQ_GENERAL) && $this->general === null) {
            if (!$throwExeception) {
                return false;
            }
            throw new \InvalidArgumentException('require general');
        }

        if (($valueType & static::REQ_CITY) && $this->city === null) {
            if (!$throwExeception) {
                return false;
            }
            throw new \InvalidArgumentException('require city');
        }

        if (($valueType & static::REQ_NATION) && $this->nation === null) {
            if (!$throwExeception) {
                return false;
            }
            throw new \InvalidArgumentException('require nation');
        }

        if (($valueType & static::REQ_DEST_GENERAL) && $this->destGeneral === null) {
            if (!$throwExeception) {
                return false;
            }
            throw new \InvalidArgumentException('require dest general');
        }

        if (($valueType & static::REQ_DEST_CITY) && $this->destCity === null) {
            if (!$throwExeception) {
                return false;
            }
            throw new \InvalidArgumentException('require dest city');
        }

        if (($valueType & static::REQ_DEST_NATION) && $this->destNation === null) {
            if (!$throwExeception) {
                return false;
            }
            throw new \InvalidArgumentException('require dest nation');
        }

        if (!($valueType & static::REQ_ARG)) {
            return true;
        }

        if ($valueType === null) {
            if (!$throwExeception) {
                return false;
            }
            throw new \InvalidArgumentException('require arg');
        }

        if ((($valueType & static::REQ_STRING_ARG) === static::REQ_STRING_ARG) && !is_string($this->arg)) {
            if (!$throwExeception) {
                return false;
            }
            throw new \InvalidArgumentException('require string arg');
        }

        if ((($valueType & static::REQ_BOOLEAN_ARG) === static::REQ_BOOLEAN_ARG) && !is_bool($this->arg)) {
            if (!$throwExeception) {
                return false;
            }
            throw new \InvalidArgumentException('require bool arg');
        }

        if ((($valueType & static::REQ_INT_ARG) === static::REQ_INT_ARG) && !is_int($this->arg)) {
            if (!$throwExeception) {
                return false;
            }
            throw new \InvalidArgumentException('require int arg');
        }

        if ((($valueType & static::REQ_NUMERIC_ARG) === static::REQ_NUMERIC_ARG) && !is_numeric($this->arg)) {
            if (!$throwExeception) {
                return false;
            }
            throw new \InvalidArgumentException('require numeric arg');
        }

        if ((($valueType & static::REQ_ARRAY_ARG) === static::REQ_ARRAY_ARG) && !is_array($this->arg)) {
            if (!$throwExeception) {
                return false;
            }
            throw new \InvalidArgumentException('require array arg');
        }

        if ((($valueType & static::REQ_BACKED_ENUM_ARG) === static::REQ_BACKED_ENUM_ARG) && !($this->arg instanceof \BackedEnum)) {
            if (!$throwExeception) {
                return false;
            }
            throw new \InvalidArgumentException('require backed enum arg');
        }

        return true;
    }

    public function reason(): ?string
    {
        if ($this->tested === false) {
            throw new \RuntimeException(get_class($this) . '::test가 실행되지 않음');
        }
        return $this->reason;
    }

    public static function testAll(array $constraintPacks, array $input, array $env): ?array
    {
        foreach ($constraintPacks as $constraintArgs) {
            if (!$constraintArgs) {
                continue;
            }

            $constraintName = $constraintArgs[0];
            $method = __NAMESPACE__ . '\\' . $constraintName . '::build';

            /** @var \sammo\Constraint\Constraint $contraint */
            $constraint = call_user_func($method, $input);

            assert($constraint instanceof Constraint);
            $constraint->setEnv($env);
            if (count($constraintArgs) == 2) {
                $arg = $constraintArgs[1];
                $constraint->setArg($arg);
            }


            if (!$constraint->test()) {

                if ($constraint->reason() === null) {
                    throw new \RuntimeException('Reason is not set:' . $constraintName);
                }
                return [$constraintName, $constraint->reason()];
            }
        }

        return null;
    }
}