#ifndef VOXELS_CHUNKS_HPP_
#define VOXELS_CHUNKS_HPP_

#include <stdlib.h>
#include <vector>
#include <memory>
#include <glm/glm.hpp>

#include "voxel.hpp"
#include "../typedefs.hpp"

class VoxelRenderer;

struct AABB;
class Content;
class ContentIndices;
class Chunk;
class WorldFiles;
class LevelEvents;
class Block;
class Level;

/// Player-centred chunks matrix
class Chunks {
    Level* level;
    const ContentIndices* const indices;

    void eraseSegments(const Block* def, blockstate state, int x, int y, int z);
    void repairSegments(const Block* def, blockstate state, int x, int y, int z);
    void setRotationExtended(Block* def, blockstate state, const glm::ivec3 &origin, uint8_t rotation);
public:
    std::vector<std::shared_ptr<Chunk>> chunks;
    std::vector<std::shared_ptr<Chunk>> chunksSecond;
    size_t volume;
    size_t chunksCount;
    size_t visible = 0;
    uint32_t w, d;
    int32_t ox, oz;
    WorldFiles* worldFiles;

    Chunks(uint32_t w, uint32_t d, int32_t ox, int32_t oz, 
           WorldFiles* worldFiles, Level* level);
    ~Chunks() = default;

    bool putChunk(const std::shared_ptr<Chunk>& chunk);

    Chunk* getChunk(int32_t x, int32_t z);
    Chunk* getChunkByVoxel(int32_t x, int32_t y, int32_t z);
    voxel* get(int32_t x, int32_t y, int32_t z) const;

    inline voxel* get(const glm::ivec3 &pos) {
        return get(pos.x, pos.y, pos.z);
    }

    light_t getLight(int32_t x, int32_t y, int32_t z);
    ubyte getLight(int32_t x, int32_t y, int32_t z, int channel);
    void set(int32_t x, int32_t y, int32_t z, uint32_t id, blockstate state);

    /// @brief Seek for the extended block origin position
    /// @param pos segment block position
    /// @param def segment block definition
    /// @param state segment block state
    /// @return origin block position or `pos` if block is not extended
    glm::ivec3 seekOrigin(glm::ivec3 pos, const Block* def, blockstate state);

    /// @brief Check if required zone is replaceable
    /// @param def definition of the block that requires a replaceable zone
    /// @param state the block state
    /// @param coord position of the zone start
    /// @param ignore ignored block id (will be counted as replaceable)
    bool checkReplaceability(const Block* def, blockstate state, const glm::ivec3 &coord, blockid_t ignore=0);

    void setRotation(int32_t x, int32_t y, int32_t z, uint8_t rotation);

    voxel* rayCast(
        const glm::vec3 &start,
        const glm::vec3 &dir,
        float maxLength, 
        glm::vec3& end, 
        glm::ivec3& norm, 
        glm::ivec3& iend
    );

    glm::vec3 rayCastToObstacle(const glm::vec3 &start, const glm::vec3 &dir, float maxDist);

    const AABB* isObstacleAt(float x, float y, float z);
    bool isSolidBlock(int32_t x, int32_t y, int32_t z);
    bool isReplaceableBlock(int32_t x, int32_t y, int32_t z);
    bool isObstacleBlock(int32_t x, int32_t y, int32_t z);

    // does not move chunks inside
    void _setOffset(int32_t x, int32_t z);

    void setCenter(int32_t x, int32_t z);
    void translate(int32_t x, int32_t z);
    void resize(uint32_t newW, uint32_t newD);

    void saveAndClear();
    void save(Chunk* chunk);
    void saveAll();
};

#endif // VOXELS_CHUNKS_HPP_