#pragma once
#include <cstdint>
#include <string>
#include <string_view>
#include "pico/time.h"

struct log_entry {
    uint32_t timestamp_us;
    std::string message;
};

class log_iterator {
    const log_entry* data;
    uint16_t base;
    uint16_t cap;
    uint16_t pos;
public:
    log_iterator(const log_entry* d, uint16_t b, uint16_t c, uint16_t p)
        : data(d), base(b), cap(c), pos(p) {}
    const log_entry& operator*() const { return data[(base + pos) % cap]; }
    log_iterator& operator++() { ++pos; return *this; }
    bool operator!=(const log_iterator& o) const { return pos != o.pos; }
};

class log_view {
    const log_entry* data;
    uint16_t base;
    uint16_t cap;
    uint16_t count;
public:
    log_view(const log_entry* d, uint16_t b, uint16_t c, uint16_t n)
        : data(d), base(b), cap(c), count(n) {}
    log_iterator begin() const { return {data, base, cap, 0}; }
    log_iterator end() const { return {data, base, cap, count}; }
};

log_view log_entries();

void dlog(std::string_view msg);

__attribute__((format(printf, 1, 2)))
void dlogf(const char* fmt, ...);

template <typename F>
inline void dlog_if_slow(std::string_view label, uint32_t threshold_us, F&& fn) {
    uint32_t t0 = time_us_32();
    fn();
    uint32_t elapsed = time_us_32() - t0;
    if (elapsed > threshold_us) {
        dlogf("%.*s %luus", static_cast<int>(label.size()), label.data(), static_cast<unsigned long>(elapsed));
    }
}