--[[
    Everness. Never ending discovery in Everness mapgen.
    Copyright (C) 2022 SaKeL

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

--]]

local skybox_defs = {
    ['everness:cursed_lands'] = {
        sky_parameters = {
            type = 'regular',
            sky_color = {
                day_sky = '#89ADB1',
                day_horizon = '#A9CDD1',
                dawn_sky = '#A5C9CD',
                dawn_horizon = '#AACED2',
                night_sky = '#416569',
                night_horizon = '#6A8E92',
                indoors = '#4A6E72',
                fog_sun_tint = '#7CA0A4',
                fog_moon_tint = '#7DA1A5'
            }
        },
        sun_parameters = {
            scale = 1.57,
            texture = 'everness_cursed_lands_sun.png',
            sunrise = 'everness_cursed_lands_sunrisebg.png',
            tonemap = 'everness_cursed_lands_sun_tonemap.png'
        },
        moon_parameters = {
            scale = 1.57,
            texture = 'everness_cursed_lands_moon.png',
            tonemap = 'everness_cursed_lands_moon_tonemap.png'
        },
        cloud_parameters = {
            density = 0.7,
            color = '#A9CDD1E5',
            speed = { x = -2, z = -2 }
        }
    },
    ['everness:cursed_lands_dunes'] = {
        sky_parameters = {
            type = 'regular',
            sky_color = {
                day_sky = '#89ADB1',
                day_horizon = '#A9CDD1',
                dawn_sky = '#A5C9CD',
                dawn_horizon = '#AACED2',
                night_sky = '#416569',
                night_horizon = '#6A8E92',
                indoors = '#4A6E72',
                fog_sun_tint = '#7CA0A4',
                fog_moon_tint = '#7DA1A5'
            }
        },
        sun_parameters = {
            texture = 'everness_cursed_lands_sun.png',
            scale = 1.57,
            sunrise = 'everness_cursed_lands_sunrisebg.png',
            tonemap = 'everness_cursed_lands_sun_tonemap.png'
        },
        moon_parameters = {
            texture = 'everness_cursed_lands_moon.png',
            tonemap = 'everness_cursed_lands_moon_tonemap.png'
        },
        cloud_parameters = {
            density = 0.7,
            color = '#A9CDD1E5',
            speed = { x = -2, z = -2 }
        }
    },
    ['everness:cursed_lands_swamp'] = {
        sky_parameters = {
            type = 'regular',
            sky_color = {
                day_sky = '#89ADB1',
                day_horizon = '#A9CDD1',
                dawn_sky = '#A5C9CD',
                dawn_horizon = '#AACED2',
                night_sky = '#416569',
                night_horizon = '#6A8E92',
                indoors = '#4A6E72',
                fog_sun_tint = '#7CA0A4',
                fog_moon_tint = '#7DA1A5'
            }
        },
        sun_parameters = {
            texture = 'everness_cursed_lands_sun.png',
            scale = 1.57,
            sunrise = 'everness_cursed_lands_sunrisebg.png',
            tonemap = 'everness_cursed_lands_sun_tonemap.png'
        },
        moon_parameters = {
            texture = 'everness_cursed_lands_moon.png',
            tonemap = 'everness_cursed_lands_moon_tonemap.png'
        },
        cloud_parameters = {
            density = 0.7,
            color = '#A9CDD1E5',
            speed = { x = -2, z = -2 }
        }
    },
    ['everness:cursed_lands_ocean'] = {
        sky_parameters = {
            type = 'regular',
            sky_color = {
                day_sky = '#89ADB1',
                day_horizon = '#A9CDD1',
                dawn_sky = '#A5C9CD',
                dawn_horizon = '#AACED2',
                night_sky = '#416569',
                night_horizon = '#6A8E92',
                indoors = '#4A6E72',
                fog_sun_tint = '#7CA0A4',
                fog_moon_tint = '#7DA1A5'
            }
        },
        sun_parameters = {
            texture = 'everness_cursed_lands_sun.png',
            scale = 1.57,
            sunrise = 'everness_cursed_lands_sunrisebg.png',
            tonemap = 'everness_cursed_lands_sun_tonemap.png'
        },
        moon_parameters = {
            texture = 'everness_cursed_lands_moon.png',
            tonemap = 'everness_cursed_lands_moon_tonemap.png'
        },
        cloud_parameters = {
            density = 0.7,
            color = '#A9CDD1E5',
            speed = { x = -2, z = -2 }
        }
    },
    ['everness:cursed_lands_under'] = {
        sky_parameters = {
            type = 'regular',
            sky_color = {
                day_sky = '#89ADB1',
                day_horizon = '#A9CDD1',
                dawn_sky = '#A5C9CD',
                dawn_horizon = '#AACED2',
                night_sky = '#416569',
                night_horizon = '#6A8E92',
                indoors = '#4A6E72',
                fog_sun_tint = '#7CA0A4',
                fog_moon_tint = '#7DA1A5'
            }
        },
        sun_parameters = {
            texture = 'everness_cursed_lands_sun.png',
            scale = 1.57,
            sunrise = 'everness_cursed_lands_sunrisebg.png',
            tonemap = 'everness_cursed_lands_sun_tonemap.png'
        },
        moon_parameters = {
            texture = 'everness_cursed_lands_moon.png',
            tonemap = 'everness_cursed_lands_moon_tonemap.png'
        },
        cloud_parameters = {
            density = 0.7,
            color = '#A9CDD1E5',
            speed = { x = -2, z = -2 }
        }
    },
    ['everness:coral_forest'] = {
        sky_parameters = {
            type = 'regular',
            sky_color = {
                -- day_sky = '#C492A5',
                day_sky = '#61B5F5',
                day_horizon = '#E4B2C5',
                dawn_sky = '#E0AEC1',
                dawn_horizon = '#E5B3C6',
                night_sky = '#7C4A5D',
                night_horizon = '#A57386',
                indoors = '#855366',
                fog_sun_tint = '#B78598',
                fog_moon_tint = '#B88699'
            }
        },
        sun_parameters = {
            texture = 'everness_coral_forest_sun.png',
            scale = 1.57,
            tonemap = 'everness_coral_forest_sun_tonemap.png',
            sunrise = ''
        },
    },
    ['everness:coral_forest_dunes'] = {
        sky_parameters = {
            type = 'regular',
            sky_color = {
                -- day_sky = '#C492A5',
                day_sky = '#61B5F5',
                day_horizon = '#E4B2C5',
                dawn_sky = '#E0AEC1',
                dawn_horizon = '#E5B3C6',
                night_sky = '#7C4A5D',
                night_horizon = '#A57386',
                indoors = '#855366',
                fog_sun_tint = '#B78598',
                fog_moon_tint = '#B88699'
            }
        },
        sun_parameters = {
            texture = 'everness_coral_forest_sun.png',
            scale = 1.57,
            tonemap = 'everness_coral_forest_sun_tonemap.png',
            sunrise = ''
        },
    },
    ['everness:coral_forest_ocean'] = {
        sky_parameters = {
            type = 'regular',
            sky_color = {
                -- day_sky = '#C492A5',
                day_sky = '#61B5F5',
                day_horizon = '#E4B2C5',
                dawn_sky = '#E0AEC1',
                dawn_horizon = '#E5B3C6',
                night_sky = '#7C4A5D',
                night_horizon = '#A57386',
                indoors = '#855366',
                fog_sun_tint = '#B78598',
                fog_moon_tint = '#B88699'
            }
        },
        sun_parameters = {
            texture = 'everness_coral_forest_sun.png',
            scale = 1.57,
            tonemap = 'everness_coral_forest_sun_tonemap.png',
            sunrise = ''
        },
    },
    ['everness:coral_forest_under'] = {
        sky_parameters = {
            type = 'regular',
            sky_color = {
                -- day_sky = '#C492A5',
                day_sky = '#61B5F5',
                day_horizon = '#E4B2C5',
                dawn_sky = '#E0AEC1',
                dawn_horizon = '#E5B3C6',
                night_sky = '#7C4A5D',
                night_horizon = '#A57386',
                indoors = '#855366',
                fog_sun_tint = '#B78598',
                fog_moon_tint = '#B88699'
            }
        },
    },
    ['everness:bamboo_forest'] = {
        sky_parameters = {
            type = 'regular',
            sky_color = {
                -- day_sky = '#5DD35D',
                day_sky = '#61B5F5',
                day_horizon = '#BFFFBF',
                -- dawn_sky = '#79EF79',
                dawn_sky = '#B4BAFA',
                dawn_horizon = '#7EF47E',
                -- night_sky = '#158B15',
                night_sky = '#006BFF',
                night_horizon = '#3EB43E',
                indoors = '#1E941E',
                fog_sun_tint = '#50C650',
                fog_moon_tint = '#51C751'
            }
        },
        sun_parameters = {
            texture = 'everness_bamboo_forest_sun.png',
            scale = 1.57,
            tonemap = 'everness_bamboo_forest_sun_tonemap.png',
            sunrise = 'everness_bamboo_forest_sunrisebg.png',
        },
    },
    ['everness:bamboo_forest_under'] = {
        sky_parameters = {
            type = 'regular',
            sky_color = {
                -- day_sky = '#5DD35D',
                day_sky = '#61B5F5',
                day_horizon = '#BFFFBF',
                -- dawn_sky = '#79EF79',
                dawn_sky = '#B4BAFA',
                dawn_horizon = '#7EF47E',
                -- night_sky = '#158B15',
                night_sky = '#006BFF',
                night_horizon = '#3EB43E',
                indoors = '#1E941E',
                fog_sun_tint = '#50C650',
                fog_moon_tint = '#51C751'
            }
        },
    },
    ['everness:frosted_icesheet'] = {
        sky_parameters = {
            type = 'regular',
            sky_color = {
                day_sky = '#9DA4AA',
                day_horizon = '#BDC4CA',
                dawn_sky = '#B9C0C6',
                dawn_horizon = '#BEC5CB',
                night_sky = '#555C62',
                night_horizon = '#7E858B',
                indoors = '#5E656B',
                fog_sun_tint = '#90979D',
                fog_moon_tint = '#91989E'
            }
        },
        sun_parameters = {
            texture = 'everness_frosted_icesheet_sun.png',
            scale = 1.57,
            tonemap = 'everness_frosted_icesheet_sun_tonemap.png',
            sunrise = ''
        },
    },
    ['everness:frosted_icesheet_ocean'] = {
        sky_parameters = {
            type = 'regular',
            sky_color = {
                day_sky = '#9DA4AA',
                day_horizon = '#BDC4CA',
                dawn_sky = '#B9C0C6',
                dawn_horizon = '#BEC5CB',
                night_sky = '#555C62',
                night_horizon = '#7E858B',
                indoors = '#5E656B',
                fog_sun_tint = '#90979D',
                fog_moon_tint = '#91989E'
            }
        },
        sun_parameters = {
            texture = 'everness_frosted_icesheet_sun.png',
            scale = 1.57,
            tonemap = 'everness_frosted_icesheet_sun_tonemap.png',
            sunrise = ''
        },
    },
    ['everness:frosted_icesheet_under'] = {
        sky_parameters = {
            type = 'regular',
            sky_color = {
                day_sky = '#9DA4AA',
                day_horizon = '#BDC4CA',
                dawn_sky = '#B9C0C6',
                dawn_horizon = '#BEC5CB',
                night_sky = '#555C62',
                night_horizon = '#7E858B',
                indoors = '#5E656B',
                fog_sun_tint = '#90979D',
                fog_moon_tint = '#91989E'
            }
        },
    },
    ['everness:crystal_forest'] = {
        sky_parameters = {
            type = 'regular',
            sky_color = {
                -- day_sky = '#B992C5',
                day_sky = '#61B5F5',
                day_horizon = '#D9B2E5',
                dawn_sky = '#D5AEE1',
                dawn_horizon = '#DAB3E6',
                night_sky = '#714A7D',
                night_horizon = '#9A73A6',
                indoors = '#7A5386',
                fog_sun_tint = '#AC85B8',
                fog_moon_tint = '#AD86B9'
            }
        },
        moon_parameters = {
            texture = 'everness_crystal_forest_moon.png',
            tonemap = 'everness_crystal_forest_moon_tonemap.png'
        },
        star_parameters = {
            count = 6000,
            scale = 0.5
        },
        sun_parameters = {
            texture = 'everness_crystal_forest_sun.png',
            scale = 1.57,
            tonemap = 'everness_crystal_forest_sun_tonemap.png',
            sunrise = ''
        },
    },
    ['everness:crystal_forest_dunes'] = {
        sky_parameters = {
            type = 'regular',
            sky_color = {
                -- day_sky = '#B992C5',
                day_sky = '#61B5F5',
                day_horizon = '#D9B2E5',
                dawn_sky = '#D5AEE1',
                dawn_horizon = '#DAB3E6',
                night_sky = '#714A7D',
                night_horizon = '#9A73A6',
                indoors = '#7A5386',
                fog_sun_tint = '#AC85B8',
                fog_moon_tint = '#AD86B9'
            }
        },
        moon_parameters = {
            texture = 'everness_crystal_forest_moon.png',
            tonemap = 'everness_crystal_forest_moon_tonemap.png'
        },
        star_parameters = {
            count = 6000,
            scale = 0.5
        },
        sun_parameters = {
            texture = 'everness_crystal_forest_sun.png',
            scale = 1.57,
            tonemap = 'everness_crystal_forest_sun_tonemap.png',
            sunrise = ''
        },
    },
    ['everness:crystal_forest_shore'] = {
        sky_parameters = {
            type = 'regular',
            sky_color = {
                -- day_sky = '#B992C5',
                day_sky = '#61B5F5',
                day_horizon = '#D9B2E5',
                dawn_sky = '#D5AEE1',
                dawn_horizon = '#DAB3E6',
                night_sky = '#714A7D',
                night_horizon = '#9A73A6',
                indoors = '#7A5386',
                fog_sun_tint = '#AC85B8',
                fog_moon_tint = '#AD86B9'
            }
        },
        moon_parameters = {
            texture = 'everness_crystal_forest_moon.png',
            tonemap = 'everness_crystal_forest_moon_tonemap.png'
        },
        star_parameters = {
            count = 6000,
            scale = 0.5
        },
        sun_parameters = {
            texture = 'everness_crystal_forest_sun.png',
            scale = 1.57,
            tonemap = 'everness_crystal_forest_sun_tonemap.png',
            sunrise = ''
        },
    },
    ['everness:crystal_forest_ocean'] = {
        sky_parameters = {
            type = 'regular',
            sky_color = {
                -- day_sky = '#B992C5',
                day_sky = '#61B5F5',
                day_horizon = '#D9B2E5',
                dawn_sky = '#D5AEE1',
                dawn_horizon = '#DAB3E6',
                night_sky = '#714A7D',
                night_horizon = '#9A73A6',
                indoors = '#7A5386',
                fog_sun_tint = '#AC85B8',
                fog_moon_tint = '#AD86B9'
            }
        },
        moon_parameters = {
            texture = 'everness_crystal_forest_moon.png',
            tonemap = 'everness_crystal_forest_moon_tonemap.png'
        },
        star_parameters = {
            count = 6000,
            scale = 0.5
        },
        sun_parameters = {
            texture = 'everness_crystal_forest_sun.png',
            scale = 1.57,
            tonemap = 'everness_crystal_forest_sun_tonemap.png',
            sunrise = ''
        },
    },
    ['everness:crystal_forest_under'] = {
        sky_parameters = {
            type = 'regular',
            sky_color = {
                -- day_sky = '#B992C5',
                day_sky = '#61B5F5',
                day_horizon = '#D9B2E5',
                dawn_sky = '#D5AEE1',
                dawn_horizon = '#DAB3E6',
                night_sky = '#714A7D',
                night_horizon = '#9A73A6',
                indoors = '#7A5386',
                fog_sun_tint = '#AC85B8',
                fog_moon_tint = '#AD86B9'
            }
        },
        star_parameters = {
            count = 6000,
            scale = 0.5
        }
    },
    ['everness:forsaken_desert'] = {
        sky_parameters = {
            type = 'regular',
            sky_color = {
                day_sky = '#D5946E',
                day_horizon = '#F5B48E',
                dawn_sky = '#F1B08A',
                dawn_horizon = '#F6B58F',
                night_sky = '#8D4C26',
                night_horizon = '#B6754F',
                indoors = '#96552F',
                fog_sun_tint = '#C88761',
                fog_moon_tint = '#C98862'
            }
        },
        sun_parameters = {
            texture = 'everness_forsaken_desert_sun.png',
            scale = 3.14,
            tonemap = 'everness_forsaken_desert_sun_tonemap.png',
            sunrise = ''
        },
    },
    ['everness:forsaken_desert_ocean'] = {
        sky_parameters = {
            type = 'regular',
            sky_color = {
                day_sky = '#D5946E',
                day_horizon = '#F5B48E',
                dawn_sky = '#F1B08A',
                dawn_horizon = '#F6B58F',
                night_sky = '#8D4C26',
                night_horizon = '#B6754F',
                indoors = '#96552F',
                fog_sun_tint = '#C88761',
                fog_moon_tint = '#C98862'
            }
        },
        sun_parameters = {
            texture = 'everness_forsaken_desert_sun.png',
            scale = 3.14,
            tonemap = 'everness_forsaken_desert_sun_tonemap.png',
            sunrise = ''
        },
    },
    ['everness:forsaken_desert_under'] = {
        sky_parameters = {
            type = 'regular',
            sky_color = {
                day_sky = '#D5946E',
                day_horizon = '#F5B48E',
                dawn_sky = '#F1B08A',
                dawn_horizon = '#F6B58F',
                night_sky = '#8D4C26',
                night_horizon = '#B6754F',
                indoors = '#96552F',
                fog_sun_tint = '#C88761',
                fog_moon_tint = '#C98862'
            }
        }
    },
    ['everness:baobab_savanna'] = {
        sky_parameters = {
            type = 'regular',
            sky_color = {
                day_sky = '#C4A156',
                day_horizon = '#E4C176',
                dawn_sky = '#E0BD72',
                dawn_horizon = '#E5C277',
                night_sky = '#7C590E',
                night_horizon = '#A58237',
                indoors = '#856217',
                fog_sun_tint = '#B79449',
                fog_moon_tint = '#B8954A'
            }
        },
        sun_parameters = {
            texture = 'everness_baobab_savanna_sun.png',
            scale = 1.57,
            tonemap = '',
            sunrise = ''
        },
    },
    ['everness:forsaken_tundra'] = {
        sky_parameters = {
            type = 'regular',
            sky_color = {
                day_sky = '#A3A49F',
                -- day_sky = '#CAA339',
                day_horizon = '#EAC359',
                dawn_sky = '#E6BF55',
                dawn_horizon = '#EBC45A',
                -- night_sky = '#5B5C57',
                night_sky = '#7C5B01',
                night_horizon = '#AB841A',
                indoors = '#896401',
                fog_sun_tint = '#BD962C',
                fog_moon_tint = '#BE972D'
            }
        },
        sun_parameters = {
            texture = 'everness_forsaken_tundra_sun.png',
            scale = 1.57,
            tonemap = 'everness_forsaken_tundra_sun_tonemap.png',
            sunrise = ''
        },
    },
    ['everness:forsaken_tundra_beach'] = {
        sky_parameters = {
            type = 'regular',
            sky_color = {
                day_sky = '#A3A49F',
                -- day_sky = '#CAA339',
                day_horizon = '#EAC359',
                dawn_sky = '#E6BF55',
                dawn_horizon = '#EBC45A',
                -- night_sky = '#5B5C57',
                night_sky = '#7C5B01',
                night_horizon = '#AB841A',
                indoors = '#896401',
                fog_sun_tint = '#BD962C',
                fog_moon_tint = '#BE972D'
            }
        },
        sun_parameters = {
            texture = 'everness_forsaken_tundra_sun.png',
            scale = 1.57,
            tonemap = 'everness_forsaken_tundra_sun_tonemap.png',
            sunrise = ''
        },
    },
    ['everness:forsaken_tundra_ocean'] = {
        sky_parameters = {
            type = 'regular',
            sky_color = {
                day_sky = '#A3A49F',
                -- day_sky = '#CAA339',
                day_horizon = '#EAC359',
                dawn_sky = '#E6BF55',
                dawn_horizon = '#EBC45A',
                -- night_sky = '#5B5C57',
                night_sky = '#7C5B01',
                night_horizon = '#AB841A',
                indoors = '#896401',
                fog_sun_tint = '#BD962C',
                fog_moon_tint = '#BE972D'
            }
        },
        sun_parameters = {
            texture = 'everness_forsaken_tundra_sun.png',
            scale = 1.57,
            tonemap = 'everness_forsaken_tundra_sun_tonemap.png',
            sunrise = ''
        },
    },
    ['everness:forsaken_tundra_under'] = {
        sky_parameters = {
            type = 'regular',
            sky_color = {
                day_sky = '#A3A49F',
                -- day_sky = '#CAA339',
                day_horizon = '#EAC359',
                dawn_sky = '#E6BF55',
                dawn_horizon = '#EBC45A',
                -- night_sky = '#5B5C57',
                night_sky = '#7C5B01',
                night_horizon = '#AB841A',
                indoors = '#896401',
                fog_sun_tint = '#BD962C',
                fog_moon_tint = '#BE972D'
            }
        }
    },
    ['everness:mineral_waters'] = {
        sky_parameters = {
            -- type = 'regular',
            -- sky_color = {
                --     day_sky = '#264890',
                --     day_horizon = '#3884CF',
                --     dawn_sky = '#B4BAFA',
                --     dawn_horizon = '#FDA47E',
                --     night_sky = '#A3609E',
                --     night_horizon = '#C7A8D9',
                --     fog_sun_tint = '#FDA47E',
                --     fog_moon_tint = '#FAE0EB'
                -- },
            type = 'skybox',
            base_color = '#8099CC',
            _day_base_color = '#8099CC',
            _night_base_color = '#000714',
            _textures_base = {
                -- Y+ (top)
                'everness_mineral_waters_skybox.png^[sheet:4x3:1,0',
                -- Y- (bottom)
                'everness_mineral_waters_skybox.png^[sheet:4x3:1,2',
                -- X- (west)
                'everness_mineral_waters_skybox.png^[sheet:4x3:0,1',
                -- X+ (east)
                'everness_mineral_waters_skybox.png^[sheet:4x3:2,1',
                -- Z+ (north)
                'everness_mineral_waters_skybox.png^[sheet:4x3:1,1',
                -- Z- (south)
                'everness_mineral_waters_skybox.png^[sheet:4x3:3,1',
            },
            textures = {
                -- Y+ (top)
                'everness_mineral_waters_skybox.png^[sheet:4x3:1,0',
                -- Y- (bottom)
                'everness_mineral_waters_skybox.png^[sheet:4x3:1,2',
                -- X- (west)
                'everness_mineral_waters_skybox.png^[sheet:4x3:0,1',
                -- X+ (east)
                'everness_mineral_waters_skybox.png^[sheet:4x3:2,1',
                -- Z+ (north)
                'everness_mineral_waters_skybox.png^[sheet:4x3:1,1',
                -- Z- (south)
                'everness_mineral_waters_skybox.png^[sheet:4x3:3,1',
            },
            clouds = false
        },
        star_parameters = {
            count = 12000,
            scale = 0.5
        },
    },
    ['everness:mineral_waters_under'] = {
        sky_parameters = {
            type = 'regular',
            sky_color = {
                day_sky = '#8B1408',
                day_horizon = '#b2380a',
                dawn_sky = '#8B1408',
                dawn_horizon = '#b2380a',
                night_sky = '#A3609E',
                night_horizon = '#C7A8D9',
                fog_sun_tint = '#8B1408',
                fog_moon_tint = '#520E49'
            }
        },
        particlespawner = {
            amount = 100,
            time = 0,
            size = {
                min = 1,
                max = 2
            },
            node = { name = 'everness:mineral_lava_stone' },
            node_tile = 1,
            glow = 100,
            pos = {
                min = vector.new(-50, -50, -50),
                max = vector.new(50, 50, 50)
            },
            jitter = {
                min = vector.new(-1, -1, -1),
                max = vector.new(1, 1, 1)
            },
            vel = {
                min = vector.new(-1, -1, -1),
                max = vector.new(1, 1, 1)
            },
            exptime = {
                min = 5,
                max = 10
            },
            collisiondetection = true,
            collision_removal = true
        }
    },
}

local PLAYER_STATES = {}

local function get_player_state(player_name)
    local state = PLAYER_STATES[player_name]
    if not state then
        state = {
            biome_name = '',
            is_underground = 0,
            timeofday = 0,
            is_day = 1,
            particlespawner_id = 0,
            last_pos = nil,
            current_biome_name = nil
        }
        PLAYER_STATES[player_name] = state
    end
    return state
end

local function should_flip(player, state)
    local player_time = state.timeofday
    -- 0 not defined
    -- 1 morning
    -- 2 afternoon
    local current_time = core.get_timeofday() < 0.5 and 1 or 2
    local flip = current_time ~= player_time

    state.timeofday = current_time

    return {
        should_flip = flip,
        current_time = current_time
    }
end

local timer = 0

core.register_globalstep(function(dtime)
    timer = timer + dtime

    if timer > 5 then
        local players = core.get_connected_players()
        local tod = core.get_timeofday()
        local is_day = (tod > 0.2 and tod < 0.805)

        for _, player in ipairs(players) do
            if player and player:is_player() then
                local player_name = player:get_player_name()
                local state = get_player_state(player_name)
                local player_pos = player:get_pos()

                local rounded_pos = vector.round(player_pos)
                if not state.last_pos or not vector.equals(state.last_pos, rounded_pos) then
                    state.last_pos = rounded_pos
                    local biome_data = core.get_biome_data(player_pos)
                    if biome_data and biome_data.biome then
                        state.current_biome_name = core.get_biome_name(biome_data.biome)
                    end
                end

                local biome_name = state.current_biome_name
                if biome_name then
                    local player_biome_name = state.biome_name
                    local is_underground = state.is_underground
                    local player_is_day = state.is_day == 1
                    local should_flip_data = should_flip(player, state)
                    local biome_changed = (player_biome_name ~= biome_name)

                    -- flip sun/moon when morning/afternoon
                    if not biome_changed and should_flip_data.should_flip then
                        if skybox_defs[biome_name] and skybox_defs[biome_name].sun_parameters then
                            local sun_params = table.copy(skybox_defs[biome_name].sun_parameters)

                            if should_flip_data.current_time == 2 then
                                sun_params.texture = sun_params.texture .. '^[transformFY'
                            end

                            player:set_sun(sun_params)
                        end
                    end

                    -- Change skybox params
                    if biome_changed then
                        state.biome_name = biome_name
                        player_biome_name = biome_name

                        if skybox_defs[biome_name] then
                            if skybox_defs[biome_name].sun_parameters then
                                local sun_params = table.copy(skybox_defs[biome_name].sun_parameters)

                                -- flip sun when afternoon
                                if should_flip_data.current_time == 2 then
                                    sun_params.texture = sun_params.texture .. '^[transformFY'
                                end

                                player:set_sun(sun_params)
                            else
                                player:set_sun()
                            end

                            if skybox_defs[biome_name].moon_parameters then
                                player:set_moon(skybox_defs[biome_name].moon_parameters)
                            else
                                player:set_moon()
                            end

                            if skybox_defs[biome_name].star_parameters then
                                player:set_stars(skybox_defs[biome_name].star_parameters)
                            else
                                player:set_stars()
                            end

                            if skybox_defs[biome_name].sky_parameters then
                                player:set_sky(skybox_defs[biome_name].sky_parameters)
                            else
                                player:set_sky()
                            end

                            if skybox_defs[biome_name].cloud_parameters then
                                player:set_clouds(skybox_defs[biome_name].cloud_parameters)
                            else
                                player:set_clouds()
                            end

                            if skybox_defs[biome_name].particlespawner then
                                if state.particlespawner_id ~= 0 then
                                    core.delete_particlespawner(state.particlespawner_id)
                                    state.particlespawner_id = 0
                                end

                                local pdef = table.copy(skybox_defs[biome_name].particlespawner)
                                pdef.attached = player
                                pdef.playername = player_name

                                local pid = core.add_particlespawner(pdef)
                                state.particlespawner_id = pid or 0
                            else
                                if state.particlespawner_id ~= 0 then
                                    core.delete_particlespawner(state.particlespawner_id)
                                    state.particlespawner_id = 0
                                end
                            end
                        else
                            player:set_sun()
                            player:set_moon()
                            player:set_stars()
                            player:set_sky()
                            player:set_clouds()

                            if state.particlespawner_id ~= 0 then
                                core.delete_particlespawner(state.particlespawner_id)
                                state.particlespawner_id = 0
                            end
                        end
                    end

                    -- change day/night params
                    if player_biome_name == biome_name and player_is_day ~= is_day then
                        if skybox_defs[biome_name] then
                            if skybox_defs[biome_name].sky_parameters then
                                if skybox_defs[biome_name].sky_parameters.type == 'skybox' then
                                    state.is_day = is_day and 1 or 0

                                    if is_day then
                                        for i, v in ipairs(skybox_defs[biome_name].sky_parameters.textures) do
                                            skybox_defs[biome_name].sky_parameters.base_color = skybox_defs[biome_name].sky_parameters._day_base_color
                                            skybox_defs[biome_name].sky_parameters.textures[i] = skybox_defs[biome_name].sky_parameters._textures_base[i]
                                        end
                                    else
                                        for i, v in ipairs(skybox_defs[biome_name].sky_parameters.textures) do
                                            skybox_defs[biome_name].sky_parameters.base_color = skybox_defs[biome_name].sky_parameters._night_base_color
                                            skybox_defs[biome_name].sky_parameters.textures[i] = skybox_defs[biome_name].sky_parameters._textures_base[i] .. '^[contrast:0:-85'
                                        end
                                    end

                                    player:set_sky(skybox_defs[biome_name].sky_parameters)
                                end
                            end
                        end
                    end

                    if (player_pos.y <= -256 and is_underground == 0) or (is_underground ~= 0 and biome_changed) then
                        -- hide sun, moon, stars ... underground
                        state.is_underground = 1

                        player:set_sun({
                            visible = false,
                            sunrise_visible = false
                        })

                        player:set_moon({
                            visible = false
                        })

                        player:set_stars({
                            visible = false
                        })

                    elseif (player_pos.y > -256 and is_underground ~= 0) or (is_underground == 0 and biome_changed) then
                        -- show sun, moon, stars ... aboveground
                        state.is_underground = 0

                        player:set_sun({
                            visible = true
                        })

                        player:set_moon({
                            visible = true
                        })

                        player:set_stars({
                            visible = true,
                            sunrise_visible = true
                        })
                    end
                end
            end
        end

        timer = 0
    end
end)

core.register_on_joinplayer(function(player, last_login)
    local name = player:get_player_name()
    PLAYER_STATES[name] = nil
end)

core.register_on_leaveplayer(function(player, timed_out)
    local name = player:get_player_name()
    local state = PLAYER_STATES[name]
    if state and state.particlespawner_id and state.particlespawner_id ~= 0 then
        core.delete_particlespawner(state.particlespawner_id)
    end
    PLAYER_STATES[name] = nil
end)