#include "Evaluator.hpp"
#include "EvaluationException.hpp"
#include "../Script.hpp"

void Evaluator::Evaluate(BoundScriptStatement *statement) {
    EvaluateBlockStatement(statement);
}

void Evaluator::EvaluateStatement(BoundStatement *statement) {
    switch (statement->GetKind()){
        case BoundStatementKind ::Script: throw; // Should never happen
        case BoundStatementKind ::Block: return this -> EvaluateBlockStatement((BoundBlockStatement*)statement);
        case BoundStatementKind ::Expression: return this -> EvaluateExpressionStatement((BoundExpressionStatement*)statement);
    }
}

void Evaluator::EvaluateBlockStatement(BoundBlockStatement* statement) {
    for (auto s: statement->GetStatements()){
        this -> EvaluateStatement(s);
    }
}

void Evaluator::EvaluateExpressionStatement(BoundExpressionStatement *statement) {
    // Delete previously saved value.
    delete this->_scriptData->_lastValue;
    // Save new value
    this->_scriptData->_lastValue = this -> EvaluateExpression(statement->GetExpression());
}

EvalValue *Evaluator::EvaluateExpression(BoundExpression *expression) {
    auto type = expression -> GetType();
    switch (type->GetClass()){
        case TypeClass ::Number: return this -> EvaluateIntegerExpression(expression);
        default: throw;
    }
}

NumericEvalValue* Evaluator::EvaluateIntegerExpression(BoundExpression *expression) {
    auto exprType = expression->GetType();
    if (exprType->GetClass() != TypeClass::Number){
        throw EvaluationException("Can't evaluate expression as integer, it will not return a number.");
    }
    switch (expression->GetKind()){
        case BoundExpressionKind ::LiteralInteger: return new IntegerEvalValue(((BoundLiteralIntegerExpression*)expression)->GetValue());
        case BoundExpressionKind ::LiteralFloat: return new FloatEvalValue(((BoundLiteralFloatExpression*)expression)->GetValue());
        case BoundExpressionKind ::Binary: return this -> EvaluateIntegerBinary((BoundBinaryExpression*)expression);

        case BoundExpressionKind ::LiteralString:
        case BoundExpressionKind ::LiteralBool:
        case BoundExpressionKind ::Bad:
            throw;
    }
}

EvalValue* Evaluator::EvaluateBoolExpression(BoundExpression *expression) {
    return nullptr;
}

EvalValue* Evaluator::EvaluateStringExpression(BoundExpression *expression) {
    return nullptr;
}