#include "tree.hpp"
#include <string>

template <typename T>
std::string label(T v) {
    return std::to_string(v);
}

template <>
std::string label<std::string>(std::string v) {
    return v;
}

template <>
std::string label<const char*>(const char* v) {
    return v;
}

template <>
std::string label<binop>(binop op) {
    switch(op) {
        case binop::plus:
            return "+";
        case binop::minus:
            return "-";
        case binop::times:
            return "*";
        case binop::divide:
            return "/";
        case binop::land:
            return "&&";
        case binop::lor:
            return "||";
        case binop::eq:
            return "==";
        case binop::neq:
            return "!=";
        case binop::lt:
            return "<";
        case binop::lte:
            return "<=";
        case binop::gt:
            return ">";
        case binop::gte:
            return ">=";
        default:
            return "";
    }
}

template <>
std::string label<unop>(unop op) {
    switch(op) {
        case unop::lnot:
            return "!";
        default:
            return "";
    }
}

template <typename T>
std::string wrap_label(T v) {
    return std::string(" [label=\"") + label(v) + "\"]";
}

void expr_id::print_dot(dot& into, std::string prefix) {
    into.push_back(prefix + wrap_label(id));
}

void expr_int::print_dot(dot& into, std::string prefix) {
    into.push_back(prefix + wrap_label(val));
}

void expr_float::print_dot(dot& into, std::string prefix) {
    into.push_back(prefix + wrap_label(val));
}

void expr_binop::print_dot(dot& into, std::string prefix) {
    into.push_back(prefix + wrap_label(op));
    std::string lp = prefix + "_left";
    std::string rp = prefix + "_right";
    left->print_dot(into, lp);
    right->print_dot(into, rp);
    into.push_back(prefix + "->" + lp);
    into.push_back(prefix + "->" + rp);
}

void expr_unop::print_dot(dot& into, std::string prefix) {
    into.push_back(prefix + wrap_label(op));
    std::string cp = prefix + "_child";
    child->print_dot(into, cp);
    into.push_back(prefix + "->" + cp);
}

void expr_assign::print_dot(dot& into, std::string prefix) {
    into.push_back(prefix + wrap_label(var + "="));
    std::string cp = prefix + "_child";
    child->print_dot(into, cp);
    into.push_back(prefix + "->" + cp);
}

void stmt_block::print_dot(dot& into, std::string prefix) {
    into.push_back(prefix + wrap_label("block"));
    int index = 0;
    for(auto& child : children) {
        std::string cp = prefix + "_" + std::to_string(index);
        child->print_dot(into, cp);
        into.push_back(prefix + "->" + cp);
        index++;
    }
}

void stmt_if::print_dot(dot& into, std::string prefix) {
    into.push_back(prefix + wrap_label("if"));
    std::string cp = prefix + "_cond";
    std::string tp = prefix + "_then";
    std::string ep = prefix + "_else";

    cond->print_dot(into, cp);
    then->print_dot(into, tp);
    if(els) els->print_dot(into, ep);

    into.push_back(prefix + "->" + cp);
    into.push_back(prefix + "->" + tp);
    if(els) into.push_back(prefix + "->" + ep);
}

void stmt_while::print_dot(dot& into, std::string prefix) {
    into.push_back(prefix + wrap_label("while"));
    std::string cp = prefix + "_cond";
    std::string bp = prefix + "_body";

    cond->print_dot(into, cp);
    body->print_dot(into, bp);

    into.push_back(prefix + "->" + cp);
    into.push_back(prefix + "->" + bp);
}

void stmt_break::print_dot(dot& into, std::string prefix) {
    into.push_back(prefix + wrap_label("break"));
}

void stmt_expr::print_dot(dot& into, std::string prefix) {
    child->print_dot(into, prefix);
}