TacticsPath.h

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#pragma once
#include "common/Export.h"
 
 
#include "tactics/TacticsTypes.h"
 
#include <map>
#include <vector>
 
namespace eve::tactics {
 
enum class CellRangeMetric : std::uint8_t { Manhattan, Chebyshev, Hex };
 
struct ReachableCell {
    Cell cell;
    int  cost = 0;
};
 
class EVENGINE_API_DOMAINS Reachability {
public:
    [[nodiscard]] const std::vector<ReachableCell>& cells() const noexcept { return cells_; }
    [[nodiscard]] bool contains(Cell cell) const noexcept;
    [[nodiscard]] Result<int> cost(Cell cell) const;
    [[nodiscard]] Result<std::vector<Cell>> pathTo(Cell target) const;
 
private:
    friend class PathQuery;
    Cell                 origin_;
    std::vector<ReachableCell> cells_;
    std::map<Cell, Cell> predecessor_;
};
 
class EVENGINE_API_DOMAINS PathQuery final {
public:
    [[nodiscard]] static Result<Reachability> reachable(const BoardState& board, SubjectRef subject, int budget);
 
    [[nodiscard]] static Result<std::vector<Cell>> path(const BoardState& board, SubjectRef subject, Cell target,
                                                        int budget);
 
    [[nodiscard]] static Result<std::vector<Cell>> cellsInRange(const BoardState& board, Cell origin, int minimum,
                                                                int maximum, CellRangeMetric metric);
};
 
}  // namespace eve::tactics