/*
 * ECAL
 *
 * Copyright 2020 Matthias Ladkau. All rights reserved.
 *
 * This Source Code Form is subject to the terms of the MIT
 * License, If a copy of the MIT License was not distributed with this
 * file, You can obtain one at https://opensource.org/licenses/MIT.
 */

package interpreter

import (
	"strconv"

	"devt.de/krotik/ecal/parser"
)

/*
numberValueRuntime is the runtime component for constant numeric values.
*/
type numberValueRuntime struct {
	*baseRuntime
	numValue float64 // Numeric value
}

/*
numberValueRuntimeInst returns a new runtime component instance.
*/
func numberValueRuntimeInst(erp *ECALRuntimeProvider, node *parser.ASTNode) parser.Runtime {
	return &numberValueRuntime{newBaseRuntime(erp, node), 0}
}

/*
Validate this node and all its child nodes.
*/
func (rt *numberValueRuntime) Validate() error {
	err := rt.baseRuntime.Validate()

	if err == nil {
		rt.numValue, err = strconv.ParseFloat(rt.node.Token.Val, 64)
	}

	return err
}

/*
Eval evaluate this runtime component.
*/
func (rt *numberValueRuntime) Eval(vs parser.Scope, is map[string]interface{}) (interface{}, error) {
	_, err := rt.baseRuntime.Eval(vs, is)

	return rt.numValue, err
}

/*
stringValueRuntime is the runtime component for constant string values.
*/
type stringValueRuntime struct {
	*baseRuntime
}

/*
stringValueRuntimeInst returns a new runtime component instance.
*/
func stringValueRuntimeInst(erp *ECALRuntimeProvider, node *parser.ASTNode) parser.Runtime {
	return &stringValueRuntime{newBaseRuntime(erp, node)}
}

/*
Eval evaluate this runtime component.
*/
func (rt *stringValueRuntime) Eval(vs parser.Scope, is map[string]interface{}) (interface{}, error) {
	_, err := rt.baseRuntime.Eval(vs, is)

	// Do some string interpolation

	return rt.node.Token.Val, err
}

/*
mapValueRuntime is the runtime component for map values.
*/
type mapValueRuntime struct {
	*baseRuntime
}

/*
mapValueRuntimeInst returns a new runtime component instance.
*/
func mapValueRuntimeInst(erp *ECALRuntimeProvider, node *parser.ASTNode) parser.Runtime {
	return &mapValueRuntime{newBaseRuntime(erp, node)}
}

/*
Eval evaluate this runtime component.
*/
func (rt *mapValueRuntime) Eval(vs parser.Scope, is map[string]interface{}) (interface{}, error) {
	_, err := rt.baseRuntime.Eval(vs, is)

	m := make(map[interface{}]interface{})

	if err == nil {
		for _, kvp := range rt.node.Children {

			key, err := kvp.Children[0].Runtime.Eval(vs, is)
			if err != nil {
				return nil, err
			}

			val, err := kvp.Children[1].Runtime.Eval(vs, is)
			if err != nil {
				return nil, err
			}

			m[key] = val
		}
	}

	return m, err
}

/*
listValueRuntime is the runtime component for list values.
*/
type listValueRuntime struct {
	*baseRuntime
}

/*
listValueRuntimeInst returns a new runtime component instance.
*/
func listValueRuntimeInst(erp *ECALRuntimeProvider, node *parser.ASTNode) parser.Runtime {
	return &listValueRuntime{newBaseRuntime(erp, node)}
}

/*
Eval evaluate this runtime component.
*/
func (rt *listValueRuntime) Eval(vs parser.Scope, is map[string]interface{}) (interface{}, error) {
	_, err := rt.baseRuntime.Eval(vs, is)

	var l []interface{}

	if err == nil {

		for _, item := range rt.node.Children {

			val, err := item.Runtime.Eval(vs, is)
			if err != nil {
				return nil, err
			}

			l = append(l, val)
		}
	}

	return l, nil
}