#include "global_scope.hpp"
#include "ast.hpp"

void global_function::compile() {
    env_ptr new_env = env_ptr(new env_offset(0, nullptr));
    for(auto it = params.rbegin(); it != params.rend(); it++) {
        new_env = env_ptr(new env_var(*it, new_env));
    }
    body->compile(new_env, instructions);
    instructions.push_back(instruction_ptr(new instruction_update(params.size())));
    instructions.push_back(instruction_ptr(new instruction_pop(params.size())));
}

void global_function::declare_llvm(llvm_context& ctx) {
    generated_function = ctx.create_custom_function(name, params.size());
}

void global_function::generate_llvm(llvm_context& ctx) {
    ctx.builder.SetInsertPoint(&generated_function->getEntryBlock());
    for(auto& instruction : instructions) {
        instruction->gen_llvm(ctx, generated_function);
    }
    ctx.builder.CreateRetVoid();
}

void global_constructor::generate_llvm(llvm_context& ctx) {
    auto new_function =
        ctx.create_custom_function(name, arity);
    std::vector<instruction_ptr> instructions;
    instructions.push_back(instruction_ptr(new instruction_pack(tag, arity)));
    instructions.push_back(instruction_ptr(new instruction_update(0)));
    ctx.builder.SetInsertPoint(&new_function->getEntryBlock());
    for (auto& instruction : instructions) {
        instruction->gen_llvm(ctx, new_function);
    }
    ctx.builder.CreateRetVoid();
}

global_function& global_scope::add_function(std::string n, std::vector<std::string> ps, ast_ptr b) {
    global_function* new_function = new global_function(mangle_name(n), std::move(ps), std::move(b));
    functions.push_back(global_function_ptr(new_function));
    return *new_function;
}

global_constructor& global_scope::add_constructor(std::string n, int8_t t, size_t a) {
    global_constructor* new_constructor = new global_constructor(mangle_name(n), t, a);
    constructors.push_back(global_constructor_ptr(new_constructor));
    return *new_constructor;
}

void global_scope::compile() {
    for(auto& function : functions) {
        function->compile();
    }
}

void global_scope::generate_llvm(llvm_context& ctx) {
    for(auto& constructor : constructors) {
        constructor->generate_llvm(ctx);
    }
    for(auto& function : functions) {
        function->declare_llvm(ctx);
    }
    for(auto& function : functions) {
        function->generate_llvm(ctx);
    }
}

std::string global_scope::mangle_name(const std::string& n) {
    auto occurence_it = occurence_count.find(n);
    int occurence = 0;
    if(occurence_it != occurence_count.end()) {
        occurence = occurence_it->second + 1;
    }
    occurence_count[n] = occurence;

    std::string final_name = n;
    if (occurence != 0) {
        final_name += "_";
        final_name += std::to_string(occurence);
    }
    return final_name;
}