<?php
defined( 'ABSPATH' ) || exit;

/** Validation kept separate from payment processing. */
final class BM_AP_Input {
    public static function text( $data, $key, $max = 200 ) {
        if ( isset( $data[ $key ] ) && ! is_scalar( $data[ $key ] ) ) {
            /* translators: %s: internal name of the submitted field. */
            throw new InvalidArgumentException( esc_html( sprintf( __( 'Invalid field: %s', 'buildmerce-agent-orders' ), $key ) ) );
        }
        $value = sanitize_text_field( isset( $data[ $key ] ) ? (string) $data[ $key ] : '' );
        if ( strlen( $value ) > $max ) {
            /* translators: %s: internal name of the submitted field. */
            throw new InvalidArgumentException( esc_html( sprintf( __( 'Field is too long: %s', 'buildmerce-agent-orders' ), $key ) ) );
        }
        return $value;
    }

    /** Strict dot-decimal input; reject exponent notation, overflow, negatives and silent rounding. */
    public static function money( $value, $decimals ) {
        if ( ! is_int( $decimals ) || $decimals < 0 || $decimals > 6 ) {
            throw new InvalidArgumentException( esc_html__( 'This plugin supports currencies with zero to six decimal places.', 'buildmerce-agent-orders' ) );
        }
        if ( ! is_scalar( $value ) ) {
            throw new InvalidArgumentException( esc_html__( 'Enter a valid positive price.', 'buildmerce-agent-orders' ) );
        }
        $value = trim( (string) $value );
        $pattern = 0 === $decimals ? '/^\d{1,8}$/' : '/^\d{1,8}(?:\.\d{1,' . $decimals . '})?$/';
        if ( ! preg_match( $pattern, $value ) ) {
            /* translators: %d: number of decimal places supported by the store currency. */
            throw new InvalidArgumentException( esc_html( sprintf( __( 'Enter a positive price with no more than %d decimal places. Use a dot as the decimal separator.', 'buildmerce-agent-orders' ), $decimals ) ) );
        }
        $parts = explode( '.', $value );
        $minor = (int) $parts[0] * ( 10 ** $decimals ) + (int) str_pad( isset( $parts[1] ) ? $parts[1] : '', $decimals, '0' );
        if ( $minor < 1 || $minor > 999999999 ) {
            throw new InvalidArgumentException( esc_html__( 'Price is outside the supported range.', 'buildmerce-agent-orders' ) );
        }
        return $minor;
    }

    public static function decimal( $minor, $decimals ) {
        if ( 0 === $decimals ) {
            return (string) $minor;
        }
        $factor = 10 ** $decimals;
        return intdiv( $minor, $factor ) . '.' . str_pad( (string) ( $minor % $factor ), $decimals, '0', STR_PAD_LEFT );
    }

    public static function request( $data, $decimals ) {
        $result = array();
        foreach ( array( 'product_name', 'sku', 'client_email', 'first_name', 'last_name', 'company', 'po' ) as $key ) {
            $result[ $key ] = self::text( $data, $key );
        }
        foreach ( array( 'product_name', 'sku', 'client_email' ) as $key ) {
            if ( '' === $result[ $key ] ) {
                throw new InvalidArgumentException( esc_html__( 'Product name, SKU, price and client email are required.', 'buildmerce-agent-orders' ) );
            }
        }
        if ( ! is_email( $result['client_email'] ) ) {
            throw new InvalidArgumentException( esc_html__( 'Enter a valid client email address.', 'buildmerce-agent-orders' ) );
        }
        $qty = self::text( $data, 'quantity', 5 );
        $qty = '' === $qty ? '1' : $qty;
        if ( ! preg_match( '/^[1-9]\d{0,3}$/', $qty ) ) {
            throw new InvalidArgumentException( esc_html__( 'Quantity must be a whole number from 1 to 9999.', 'buildmerce-agent-orders' ) );
        }
        $result['quantity'] = (int) $qty;
        $result['unit_minor'] = self::money( isset( $data['price'] ) ? $data['price'] : '', $decimals );
        $total = $result['unit_minor'] * $result['quantity'];
        if ( $total > 999999999 ) {
            throw new InvalidArgumentException( esc_html__( 'The order total exceeds the supported range.', 'buildmerce-agent-orders' ) );
        }
        $result['total'] = self::decimal( $total, $decimals );
        $result['price'] = self::decimal( $result['unit_minor'], $decimals );
        foreach ( array( 'customer_note', 'internal_note' ) as $key ) {
            if ( isset( $data[ $key ] ) && ! is_scalar( $data[ $key ] ) ) {
                throw new InvalidArgumentException( esc_html__( 'Invalid note.', 'buildmerce-agent-orders' ) );
            }
            $result[ $key ] = sanitize_textarea_field( isset( $data[ $key ] ) ? $data[ $key ] : '' );
            if ( strlen( $result[ $key ] ) > 2000 ) {
                throw new InvalidArgumentException( esc_html__( 'Notes must be less than 2000 bytes.', 'buildmerce-agent-orders' ) );
            }
        }
        return $result;
    }
}