#pragma once

#include <cstddef>
#include <cstdint>
#include <string>
#include <vector>

namespace roro::files {

enum class FileSort : uint8_t { Name, Date, Size };

// A folder's entries for the Storage App (F1, Q129, Q136): 256 at most, the names packed into
// one buffer, about 10 KB when full. A bigger folder keeps the first 256 by name, whatever order
// the card lists them in, and counts the rest.
class FileList {
   public:
    static constexpr size_t kMax = 256;

    void clear();
    void add(const char* name, uint32_t size, uint32_t modified, bool folder);
    void sort(FileSort by);  // folders first, by name; then files by name, newest or biggest first

    size_t count() const { return entries_.size(); }
    size_t more() const { return more_; }  // entries that didn't fit
    // By position after sort().
    const char* name(size_t i) const { return names_.data() + entries_[order_[i]].name; }
    uint32_t size(size_t i) const { return entries_[order_[i]].size; }
    uint32_t modified(size_t i) const { return entries_[order_[i]].modified; }  // Unix time, 0 if unknown
    bool folder(size_t i) const { return entries_[order_[i]].folder; }
    int find(const std::string& name) const;  // position, or -1
    size_t bytes() const;                     // memory held

   private:
    struct Entry {
        uint32_t name;  // offset into names_
        uint32_t size, modified;
        bool folder;
    };
    bool before(const Entry& a, const Entry& b, FileSort by) const;
    void compact();

    std::vector<Entry> entries_;
    std::vector<uint16_t> order_;
    std::vector<char> names_;
    size_t more_ = 0, wasted_ = 0;
};

// What a row shows on the right (Q129): "folder", or "1.2 KB  2026-10-05". A file dated before
// 2020 was written before the clock was set: "-" (Q137). Local time.
std::string rowDetail(bool folder, uint32_t size, uint32_t modified);
std::string formatStamp(uint32_t modified);
// A name cut to `maxChars` for a row, from the middle: the start and the extension stay readable.
std::string fitName(const std::string& name, size_t maxChars);  // "2026-10-05 20:00", or "-"

}  // namespace roro::files