#include <span>
#include <algorithm>
#include <ranges>
#include <string>
#include <string_view>
#include <utility>
#include <vector>

#include "fmt/std.h"

#include "aoc/types.hpp"
#include "aoc/utils.hpp"

using namespace std::string_view_literals;
using namespace aoc::types;

// starts at 50
[[maybe_unused]]constexpr auto raw_str = R"(
..@@.@@@@.
@@@.@.@.@@
@@@@@.@.@@
@.@@@@..@.
@@.@@@@.@@
.@@@@@@@.@
.@.@.@.@@@
@.@@@.@@@@
.@@@@@@@@.
@.@.@@@.@.
)";

static auto entry([[maybe_unused]]std::span<char const*> const& args) -> void {
    // std::string str{raw_str};
    auto str = aoc::read_text("./input.txt").value_or("");
    str = aoc::trim(str);

    fmt::print("INPUT\n");
    fmt::print("⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼\n");
    fmt::print("{}\n", str);
    fmt::print("{}\n", std::string(80, '-'));

    auto grid = str | std::views::split("\n"sv) | std::views::transform([](auto const& str) {
        return aoc::trim(std::string{std::begin(str), std::end(str)}) |
            std::views::transform([](auto const& ch) { return ch; }) |
            std::ranges::to<std::vector>();
    }) | std::ranges::to<std::vector>();

    u64 access = 0;
    for (isize i = 0; i < isize(grid.size()); ++i) {
        for (isize j = 0; j < isize(grid[i].size()); ++j) {
            auto const v = grid[i][j];
            if (v == '.') continue;

            u64 sum = 0;
            if (i - 1 >= 0 && j - 1 >= 0 && grid[i - 1][j - 1] == '@') ++sum;
            if (i - 1 >= 0 && grid[i - 1][j] == '@') ++sum;
            if (i - 1 >= 0 && j + 1 < isize(grid[i].size()) && grid[i - 1][j + 1] == '@') ++sum;

            if (j - 1 >= 0 && grid[i][j - 1] == '@') ++sum;
            if (j + 1 < isize(grid[i].size()) && grid[i][j + 1] == '@') ++sum;

            if (i + 1 < isize(grid.size()) && j - 1 >= 0 && grid[i + 1][j - 1] == '@') ++sum;
            if (i + 1 < isize(grid.size()) && grid[i + 1][j] == '@') ++sum;
            if (i + 1 < isize(grid.size()) && j + 1 < isize(grid[i].size()) && grid[i + 1][j + 1] == '@') ++sum;

            if (sum < 4) {
                // fmt::print("{},{}: {}\n", i, j, sum);
                ++access;
            }
        }
    }

    fmt::print("res: {}\n", access);
}

auto main([[maybe_unused]]int argc, [[maybe_unused]]char const* argv[]) -> int {
    try {
        entry({argv, std::next(argv, argc)});
    } catch (std::exception const& e) {
        fmt::print(stderr, "{}\n", e.what());
        return 1;
    }
    return 0;
}