#include <string>
#include <vector>
#include <sstream>
#include <regex>
#include <iostream>
#include <fstream>
#include <filesystem>

#undef NDEBUG
#include <cassert>

#include "jinja/jinja-parser.h"
#include "jinja/jinja-lexer.h"

void run(std::string contents);

int main(void) {
    //std::string contents = "{% if messages[0]['role'] == 'system' %}{{ raise_exception('System role not supported') }}{% endif %}{% for message in messages %}{% if (message['role'] == 'user') != (loop.index0 % 2 == 0) %}{{ raise_exception('Conversation roles must alternate user/assistant/user/assistant/...') }}{% endif %}{% if (message['role'] == 'assistant') %}{% set role = 'model' %}{% else %}{% set role = message['role'] %}{% endif %}{{ '<start_of_turn>' + role + '\\n' + message['content'] | trim + '<end_of_turn>\\n' }}{% endfor %}{% if add_generation_prompt %}{{'<start_of_turn>model\\n'}}{% endif %}";

    //std::string contents = "{% if messages[0]['role'] != 'system' %}nice {{ messages[0]['content'] }}{% endif %}";

    //std::string contents = "<some_tokens> {{ messages[a]['content'] }} <another_token>";
    //std::string contents = "{% if a is not defined %}hello{% endif %}";

    //std::ifstream infile("models/templates/mistralai-Ministral-3-14B-Reasoning-2512.jinja"); std::string contents((std::istreambuf_iterator<char>(infile)), std::istreambuf_iterator<char>());

    // list all files in models/templates/ and run each
    std::string dir_path = "models/templates/";
    for (const auto & entry : std::filesystem::directory_iterator(dir_path)) {
        if (entry.is_regular_file()) {
            std::cout << "\n\n=== RUNNING TEMPLATE FILE: " << entry.path().string() << " ===\n";
            std::ifstream infile(entry.path());
            std::string contents((std::istreambuf_iterator<char>(infile)), std::istreambuf_iterator<char>());
            try {
                run(contents);
            } catch (const std::exception & e) {
                std::cout << "Exception: " << e.what() << "\n";
                std::cout << "=== CURRENT TEMPLATE FILE: " << entry.path().string() << " ===\n";
                exit(1);
            }
        }
    }
    return 0;
}


void run(std::string contents) {
    // jinja::enable_debug(true);

    jinja::lexer lexer;
    jinja::preprocess_options options;
    options.trim_blocks = true;
    options.lstrip_blocks = false;
    auto lexer_res = lexer.tokenize(contents, options);
    for (const auto & tok : lexer_res.tokens) {
        //std::cout << "token: type=" << static_cast<int>(tok.t) << " text='" << tok.value << "' pos=" << tok.pos << "\n";
    }

    std::cout << "\n=== AST ===\n";
    jinja::program ast = jinja::parse_from_tokens(lexer_res.tokens);
    for (const auto & stmt : ast.body) {
        //std::cout << "stmt type: " << stmt->type() << "\n";
    }

    std::cout << "\n=== RUN ===\n";
    jinja::context ctx;
    ctx.source = lexer_res.preprocessed_source;

    auto make_non_special_string = [](const std::string & s) {
        jinja::value_string str_val = jinja::mk_val<jinja::value_string>(s);
        str_val->mark_input();
        return str_val;
    };

    jinja::value_array messages = jinja::mk_val<jinja::value_array>();
    jinja::value_object msg1 = jinja::mk_val<jinja::value_object>();
    msg1->insert("role",    make_non_special_string("user"));
    msg1->insert("content", make_non_special_string("Hello, how are you?"));
    messages->push_back(std::move(msg1));
    jinja::value_object msg2 = jinja::mk_val<jinja::value_object>();
    msg2->insert("role",    make_non_special_string("assistant"));
    msg2->insert("content", make_non_special_string("I am fine, thank you!"));
    messages->push_back(std::move(msg2));

    ctx.var["messages"] = std::move(messages);
    ctx.var["eos_token"] = jinja::mk_val<jinja::value_string>("</s>");
    // ctx.var["tools"] = jinja::mk_val<jinja::value_null>();

    jinja::vm vm(ctx);
    const jinja::value results = vm.execute(ast);
    auto parts = vm.gather_string_parts(results);

    std::cout << "\n=== RESULTS ===\n";
    for (const auto & part : parts.get()->val_str.parts) {
        std::cout << (part.is_input ? "DATA" : "TMPL") << ": " << part.val << "\n";
    }
}