#pragma once
#include <string>
#include <vector>
#include "binop.hpp"

namespace lily {
    struct instruction {
        virtual std::ostream& to_stream(std::ostream& os) = 0;
        virtual ~instruction() = default;
    };

    std::ostream& operator<<(std::ostream& os, instruction& inst);

    struct instruction_slide : instruction {
        int amount;
        
        instruction_slide(int a) : amount(a) {}
        std::ostream& to_stream(std::ostream& os);
    };
    
    struct instruction_alloc : instruction {
        int amount;

        instruction_alloc(int a) : amount(a) {}
        std::ostream& to_stream(std::ostream& os);
    };

    struct instruction_pop : instruction {
        int amount;

        instruction_pop(int a) : amount(a) {}
        std::ostream& to_stream(std::ostream& os);
    };

    struct instruction_unwind : instruction {
        std::ostream& to_stream(std::ostream& os);
    };

    struct instruction_push_global : instruction {
        std::string name;
        
        instruction_push_global(std::string n) : name(std::move(n)) {}
        std::ostream& to_stream(std::ostream& os);
    };

    struct instruction_push_int : instruction {
        int value;

        instruction_push_int(int v) : value(v) {}
        std::ostream& to_stream(std::ostream& os);
    };

    struct instruction_push_str : instruction {
        std::string str;

        instruction_push_str(std::string s) : str(std::move(s)) {}
        std::ostream& to_stream(std::ostream& os);
    };

    struct instruction_push : instruction {
        int offset;

        instruction_push(int o) : offset(o) {}
        std::ostream& to_stream(std::ostream& os);
    };

    struct instruction_mkapp : instruction {

        std::ostream& to_stream(std::ostream& os);
    };

    struct instruction_eval : instruction {

        std::ostream& to_stream(std::ostream& os);
    };

    struct instruction_op : instruction {
        binop op;

        instruction_op(binop o) : op(o) {}
        std::ostream& to_stream(std::ostream& os);
    };

    struct instruction_cond : instruction {
        std::vector<instruction*> true_branch;
        std::vector<instruction*> false_branch;
        std::ostream& to_stream(std::ostream& os);
    };

    struct instruction_update : instruction {
        int offset;

        instruction_update(int o) : offset(o) {}
        std::ostream& to_stream(std::ostream& os);
    };

    struct instruction_pack : instruction {
        int constructor;
        int arity;

        instruction_pack(int c, int a) :
            constructor(c), arity(a) {}
        std::ostream& to_stream(std::ostream& os);
    };

    struct instruction_split : instruction {
        int arity;

        instruction_split(int a) : arity(a) {}
        std::ostream& to_stream(std::ostream& os);
    };

    struct instruction_jump : instruction {
        std::vector<std::vector<instruction*>> instructions;
        std::ostream& to_stream(std::ostream& os);
    };

    class instruction_manager {
        private:
            std::vector<std::unique_ptr<instruction>> instructions;
        public:
            template <typename T, typename ... Ts>
            T* add_instruction(Ts ... ts) {
                auto new_inst = std::make_unique<T>(ts...);
                T* raw = new_inst.get();
                instructions.push_back(std::move(new_inst));
                return raw;
            }
    };

}