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<?php
namespace JmesPath;

/**
 * Tree visitor used to compile JMESPath expressions into native PHP code.
 */
class TreeCompiler
{
    private
$indentation;
    private
$source;
    private
$vars;

   
/**
     * @param array  $ast    AST to compile.
     * @param string $fnName The name of the function to generate.
     * @param string $expr   Expression being compiled.
     *
     * @return string
     */
   
public function visit(array $ast, $fnName, $expr)
    {
       
$this->vars = [];
       
$this->source = $this->indentation = '';
       
$this->write("<?php\n")
            ->
write('use JmesPath\\TreeInterpreter as Ti;')
            ->
write('use JmesPath\\FnDispatcher as Fd;')
            ->
write('use JmesPath\\Utils;')
            ->
write('')
            ->
write('function %s(Ti $interpreter, $value) {', $fnName)
            ->
indent()
                ->
dispatch($ast)
                ->
write('')
                ->
write('return $value;')
            ->
outdent()
        ->
write('}');

        return
$this->source;
    }

   
/**
     * @param array $node
     * @return mixed
     */
   
private function dispatch(array $node)
    {
        return
$this->{"visit_{$node['type']}"}($node);
    }

   
/**
     * Creates a monotonically incrementing unique variable name by prefix.
     *
     * @param string $prefix Variable name prefix
     *
     * @return string
     */
   
private function makeVar($prefix)
    {
        if (!isset(
$this->vars[$prefix])) {
           
$this->vars[$prefix] = 0;
            return
'$' . $prefix;
        }

        return
'$' . $prefix . ++$this->vars[$prefix];
    }

   
/**
     * Writes the given line of source code. Pass positional arguments to write
     * that match the format of sprintf.
     *
     * @param string $str String to write
     * @return $this
     */
   
private function write($str)
    {
       
$this->source .= $this->indentation;
        if (
func_num_args() == 1) {
           
$this->source .= $str . "\n";
            return
$this;
        }
       
$this->source .= vsprintf($str, array_slice(func_get_args(), 1)) . "\n";
        return
$this;
    }

   
/**
     * Decreases the indentation level of code being written
     * @return $this
     */
   
private function outdent()
    {
       
$this->indentation = substr($this->indentation, 0, -4);
        return
$this;
    }

   
/**
     * Increases the indentation level of code being written
     * @return $this
     */
   
private function indent()
    {
       
$this->indentation .= '    ';
        return
$this;
    }

    private function
visit_or(array $node)
    {
       
$a = $this->makeVar('beforeOr');
        return
$this
           
->write('%s = $value;', $a)
            ->
dispatch($node['children'][0])
            ->
write('if (!$value && $value !== "0" && $value !== 0) {')
                ->
indent()
                ->
write('$value = %s;', $a)
                ->
dispatch($node['children'][1])
                ->
outdent()
            ->
write('}');
    }

    private function
visit_and(array $node)
    {
       
$a = $this->makeVar('beforeAnd');
        return
$this
           
->write('%s = $value;', $a)
            ->
dispatch($node['children'][0])
            ->
write('if ($value || $value === "0" || $value === 0) {')
                ->
indent()
                ->
write('$value = %s;', $a)
                ->
dispatch($node['children'][1])
                ->
outdent()
            ->
write('}');
    }

    private function
visit_not(array $node)
    {
        return
$this
           
->write('// Visiting not node')
            ->
dispatch($node['children'][0])
            ->
write('// Applying boolean not to result of not node')
            ->
write('$value = !Utils::isTruthy($value);');
    }

    private function
visit_subexpression(array $node)
    {
        return
$this
           
->dispatch($node['children'][0])
            ->
write('if ($value !== null) {')
                ->
indent()
                ->
dispatch($node['children'][1])
                ->
outdent()
            ->
write('}');
    }

    private function
visit_field(array $node)
    {
       
$arr = '$value[' . var_export($node['value'], true) . ']';
       
$obj = '$value->{' . var_export($node['value'], true) . '}';
       
$this->write('if (is_array($value) || $value instanceof \\ArrayAccess) {')
                ->
indent()
                ->
write('$value = isset(%s) ? %s : null;', $arr, $arr)
                ->
outdent()
            ->
write('} elseif ($value instanceof \\stdClass) {')
                ->
indent()
                ->
write('$value = isset(%s) ? %s : null;', $obj, $obj)
                ->
outdent()
            ->
write("} else {")
                ->
indent()
                ->
write('$value = null;')
                ->
outdent()
            ->
write("}");

        return
$this;
    }

    private function
visit_index(array $node)
    {
        if (
$node['value'] >= 0) {
           
$check = '$value[' . $node['value'] . ']';
            return
$this->write(
               
'$value = (is_array($value) || $value instanceof \\ArrayAccess)'
                   
. ' && isset(%s) ? %s : null;',
               
$check, $check
           
);
        }

       
$a = $this->makeVar('count');
        return
$this
           
->write('if (is_array($value) || ($value instanceof \\ArrayAccess && $value instanceof \\Countable)) {')
                ->
indent()
                ->
write('%s = count($value) + %s;', $a, $node['value'])
                ->
write('$value = isset($value[%s]) ? $value[%s] : null;', $a, $a)
                ->
outdent()
            ->
write('} else {')
                ->
indent()
                ->
write('$value = null;')
                ->
outdent()
            ->
write('}');
    }

    private function
visit_literal(array $node)
    {
        return
$this->write('$value = %s;', var_export($node['value'], true));
    }

    private function
visit_pipe(array $node)
    {
        return
$this
           
->dispatch($node['children'][0])
            ->
dispatch($node['children'][1]);
    }

    private function
visit_multi_select_list(array $node)
    {
        return
$this->visit_multi_select_hash($node);
    }

    private function
visit_multi_select_hash(array $node)
    {
       
$listVal = $this->makeVar('list');
       
$value = $this->makeVar('prev');
       
$this->write('if ($value !== null) {')
            ->
indent()
            ->
write('%s = [];', $listVal)
            ->
write('%s = $value;', $value);

       
$first = true;
        foreach (
$node['children'] as $child) {
            if (!
$first) {
               
$this->write('$value = %s;', $value);
            }
           
$first = false;
            if (
$node['type'] == 'multi_select_hash') {
               
$this->dispatch($child['children'][0]);
               
$key = var_export($child['value'], true);
               
$this->write('%s[%s] = $value;', $listVal, $key);
            } else {
               
$this->dispatch($child);
               
$this->write('%s[] = $value;', $listVal);
            }
        }

        return
$this
           
->write('$value = %s;', $listVal)
            ->
outdent()
            ->
write('}');
    }

    private function
visit_function(array $node)
    {
       
$value = $this->makeVar('val');
       
$args = $this->makeVar('args');
       
$this->write('%s = $value;', $value)
            ->
write('%s = [];', $args);

        foreach (
$node['children'] as $arg) {
           
$this->dispatch($arg);
           
$this->write('%s[] = $value;', $args)
                ->
write('$value = %s;', $value);
        }

        return
$this->write(
           
'$value = Fd::getInstance()->__invoke("%s", %s);',
           
$node['value'], $args
       
);
    }

    private function
visit_slice(array $node)
    {
        return
$this
           
->write('$value = !is_string($value) && !Utils::isArray($value)')
            ->
write('    ? null : Utils::slice($value, %s, %s, %s);',
               
var_export($node['value'][0], true),
               
var_export($node['value'][1], true),
               
var_export($node['value'][2], true)
            );
    }

    private function
visit_current(array $node)
    {
        return
$this->write('// Visiting current node (no-op)');
    }

    private function
visit_expref(array $node)
    {
       
$child = var_export($node['children'][0], true);
        return
$this->write('$value = function ($value) use ($interpreter) {')
            ->
indent()
            ->
write('return $interpreter->visit(%s, $value);', $child)
            ->
outdent()
        ->
write('};');
    }

    private function
visit_flatten(array $node)
    {
       
$this->dispatch($node['children'][0]);
       
$merged = $this->makeVar('merged');
       
$val = $this->makeVar('val');

       
$this
           
->write('// Visiting merge node')
            ->
write('if (!Utils::isArray($value)) {')
                ->
indent()
                ->
write('$value = null;')
                ->
outdent()
            ->
write('} else {')
                ->
indent()
                ->
write('%s = [];', $merged)
                ->
write('foreach ($value as %s) {', $val)
                    ->
indent()
                    ->
write('if (is_array(%s) && isset(%s[0])) {', $val, $val)
                        ->
indent()
                        ->
write('%s = array_merge(%s, %s);', $merged, $merged, $val)
                        ->
outdent()
                    ->
write('} elseif (%s !== []) {', $val)
                        ->
indent()
                        ->
write('%s[] = %s;', $merged, $val)
                        ->
outdent()
                    ->
write('}')
                    ->
outdent()
                ->
write('}')
                ->
write('$value = %s;', $merged)
                ->
outdent()
            ->
write('}');

        return
$this;
    }

    private function
visit_projection(array $node)
    {
       
$val = $this->makeVar('val');
       
$collected = $this->makeVar('collected');
       
$this->write('// Visiting projection node')
            ->
dispatch($node['children'][0])
            ->
write('');

        if (!isset(
$node['from'])) {
           
$this->write('if (!is_array($value) || !($value instanceof \stdClass)) { $value = null; }');
        } elseif (
$node['from'] == 'object') {
           
$this->write('if (!Utils::isObject($value)) { $value = null; }');
        } elseif (
$node['from'] == 'array') {
           
$this->write('if (!Utils::isArray($value)) { $value = null; }');
        }

       
$this->write('if ($value !== null) {')
            ->
indent()
            ->
write('%s = [];', $collected)
            ->
write('foreach ((array) $value as %s) {', $val)
                ->
indent()
                ->
write('$value = %s;', $val)
                ->
dispatch($node['children'][1])
                ->
write('if ($value !== null) {')
                    ->
indent()
                    ->
write('%s[] = $value;', $collected)
                    ->
outdent()
                ->
write('}')
                ->
outdent()
            ->
write('}')
            ->
write('$value = %s;', $collected)
            ->
outdent()
        ->
write('}');

        return
$this;
    }

    private function
visit_condition(array $node)
    {
       
$value = $this->makeVar('beforeCondition');
        return
$this
           
->write('%s = $value;', $value)
            ->
write('// Visiting condition node')
            ->
dispatch($node['children'][0])
            ->
write('// Checking result of condition node')
            ->
write('if (Utils::isTruthy($value)) {')
                ->
indent()
                ->
write('$value = %s;', $value)
                ->
dispatch($node['children'][1])
                ->
outdent()
            ->
write('} else {')
                ->
indent()
                ->
write('$value = null;')
                ->
outdent()
            ->
write('}');
    }

    private function
visit_comparator(array $node)
    {
       
$value = $this->makeVar('val');
       
$a = $this->makeVar('left');
       
$b = $this->makeVar('right');

       
$this
           
->write('// Visiting comparator node')
            ->
write('%s = $value;', $value)
            ->
dispatch($node['children'][0])
            ->
write('%s = $value;', $a)
            ->
write('$value = %s;', $value)
            ->
dispatch($node['children'][1])
            ->
write('%s = $value;', $b);

        if (
$node['value'] == '==') {
           
$this->write('$value = Utils::isEqual(%s, %s);', $a, $b);
        } elseif (
$node['value'] == '!=') {
           
$this->write('$value = !Utils::isEqual(%s, %s);', $a, $b);
        } else {
           
$this->write(
               
'$value = (is_int(%s) || is_float(%s)) && (is_int(%s) || is_float(%s)) && %s %s %s;',
               
$a, $a, $b, $b, $a, $node['value'], $b
           
);
        }

        return
$this;
    }

   
/** @internal */
   
public function __call($method, $args)
    {
        throw new \
RuntimeException(
           
sprintf('Invalid node encountered: %s', json_encode($args[0]))
        );
    }
}