--[[
    Everness. Never ending discovery in Everness mapgen.
    Copyright (C) 2024 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.

--]]

--
-- Register biomes
--

local y_max = Everness.settings.biomes.everness_mineral_waters_under.y_max
local y_min = Everness.settings.biomes.everness_mineral_waters_under.y_min

-- Mineral Waters

Everness:register_biome({
    name = 'everness:mineral_waters_under',
    node_stone = 'everness:mineral_cave_stone',
    node_filler = 'everness:mineral_cave_stone',
    node_cave_liquid = 'everness:lava_source',
    node_water = 'air',
    node_dungeon = 'everness:mineral_stone_brick',
    node_dungeon_alt = 'everness:mineral_stone_brick_with_growth',
    node_dungeon_stair = 'stairs:stair_mineral_stone_brick',
    y_max = y_max,
    y_min = y_min,
    vertical_blend = 16,
    heat_point = 78,
    humidity_point = 58,
})

--
-- Ores
--

minetest.register_on_mods_loaded(function()
    local c_mapgen_stone = minetest.get_content_id('mapgen_stone')
    local mapgen_stone_itemstring = minetest.get_name_from_content_id(c_mapgen_stone)

    for name, def in pairs(minetest.registered_ores) do
        local wherein = def.wherein
        local biomes = def.biomes

        if type(def.wherein) == 'string' then
            wherein = { wherein }
        end

        -- Register the same ores what are defined for `mapgen_stone`
        if
            table.indexof(wherein, mapgen_stone_itemstring) > -1
            and not biomes
        then
            def.wherein = { 'everness:mineral_cave_stone' }
            def.biomes = { 'everness:mineral_waters_under' }
            def.y_max = y_max
            def.y_min = y_min

            Everness:register_ore(def)
        end
    end
end)

-- Blob ore.
-- These before scatter ores to avoid other ores in blobs.

Everness:register_ore({
    ore_type = 'blob',
    ore = 'everness:mineral_stone',
    wherein = { 'everness:mineral_cave_stone' },
    clust_scarcity = 16 * 16 * 16,
    clust_size = 5,
    y_max = y_max,
    y_min = y_min,
    noise_threshold = 0.0,
    noise_params = {
        offset = 0.5,
        scale = 0.2,
        spread = { x = 5, y = 5, z = 5 },
        seed = 766,
        octaves = 1,
        persist = 0.0
    },
    biomes = { 'everness:mineral_waters_under' }
})

--
-- Register decorations
--

Everness:register_decoration({
    name = 'everness:mineral_waters_under_floors',
    deco_type = 'simple',
    place_on = { 'everness:mineral_cave_stone' },
    sidelen = 16,
    place_offset_y = -1,
    fill_ratio = 10,
    biomes = { 'everness:mineral_waters_under' },
    y_max = y_max,
    y_min = y_min,
    flags = 'all_floors, force_placement',
    decoration = {
        'everness:mineral_lava_stone'
    },
})

Everness:register_decoration({
    name = 'everness:mineral_waters_under_volcanic_spike',
    deco_type = 'simple',
    place_on = {
        'everness:mineral_lava_stone',
        'everness:mineral_cave_stone'
    },
    sidelen = 16,
    noise_params = {
        offset = -0.03,
        scale = 0.09,
        spread = { x = 200, y = 200, z = 200 },
        seed = 329,
        octaves = 3,
        persist = 0.6
    },
    biomes = { 'everness:mineral_waters_under' },
    spawn_by = 'air',
    check_offset = 0,
    num_spawn_by = 1,
    decoration = {
        'everness:marker'
    },
    y_max = y_max,
    y_min = y_min,
    flags = 'all_floors',
})

Everness:register_decoration({
    name = 'everness:mineral_waters_under_lava_stone_spike',
    deco_type = 'simple',
    place_on = {
        'everness:mineral_lava_stone',
        'everness:mineral_cave_stone'
    },
    sidelen = 16,
    noise_params = {
        offset = -0.015,
        scale = 0.075,
        spread = { x = 200, y = 200, z = 200 },
        seed = 329,
        octaves = 3,
        persist = 0.6
    },
    biomes = { 'everness:mineral_waters_under' },
    decoration = {
        'everness:marker'
    },
    y_max = y_max,
    y_min = y_min,
    flags = 'all_floors',
})

--
-- On Generated
--

-- Get the content IDs for the nodes used
local c_everness_wall_vine_cave_cyan = minetest.get_content_id('everness:wall_vine_cave_cyan')
local c_everness_wall_vine_cave_violet = minetest.get_content_id('everness:wall_vine_cave_violet')
local c_everness_wall_vine_cave_blue = minetest.get_content_id('everness:wall_vine_cave_blue')
local c_everness_mineral_lava_stone = minetest.get_content_id('everness:mineral_lava_stone')
local c_everness_mineral_cave_stone = minetest.get_content_id('everness:mineral_cave_stone')
local c_everness_lava_source = minetest.get_content_id('everness:lava_source')
local c_everness_marker = minetest.get_content_id('everness:marker')
local c_everness_volcanic_rock = minetest.get_content_id('everness:volcanic_rock')
local c_everness_volcanic_spike_1 = minetest.get_content_id('everness:volcanic_spike_1')
local c_everness_volcanic_spike_2 = minetest.get_content_id('everness:volcanic_spike_2')
local c_everness_volcanic_spike_3 = minetest.get_content_id('everness:volcanic_spike_3')
local c_everness_volcanic_spike_4 = minetest.get_content_id('everness:volcanic_spike_4')
local c_everness_volcanic_spike_5 = minetest.get_content_id('everness:volcanic_spike_5')
local c_everness_volcanic_spike_6 = minetest.get_content_id('everness:volcanic_spike_6')
local c_everness_volcanic_spike_7 = minetest.get_content_id('everness:volcanic_spike_7')
local c_everness_mineral_cave_stone_spike_1 = minetest.get_content_id('everness:mineral_cave_stone_spike_1')
local c_everness_mineral_cave_stone_spike_2 = minetest.get_content_id('everness:mineral_cave_stone_spike_2')
local c_everness_mineral_cave_stone_spike_3 = minetest.get_content_id('everness:mineral_cave_stone_spike_3')
local c_everness_mineral_cave_stone_spike_4 = minetest.get_content_id('everness:mineral_cave_stone_spike_4')
local c_everness_mineral_cave_stone_spike_5 = minetest.get_content_id('everness:mineral_cave_stone_spike_5')
local c_everness_mineral_cave_stone_spike_6 = minetest.get_content_id('everness:mineral_cave_stone_spike_6')
local c_everness_mineral_cave_stone_spike_7 = minetest.get_content_id('everness:mineral_cave_stone_spike_7')
-- Biome IDs
local biome_id_everness_mineral_waters_under = minetest.get_biome_id('everness:mineral_waters_under')
-- Decoration IDs
local d_everness_mineral_waters_under_volcanic_spike = minetest.get_decoration_id('everness:mineral_waters_under_volcanic_spike')
local d_everness_mineral_waters_under_lava_stone_spike = minetest.get_decoration_id('everness:mineral_waters_under_lava_stone_spike')

local volcanic_spike_place_on = minetest.registered_decorations['everness:mineral_waters_under_volcanic_spike'].place_on
volcanic_spike_place_on = type(volcanic_spike_place_on) == 'string' and { volcanic_spike_place_on } or volcanic_spike_place_on
local lava_stone_spike_place_on = minetest.registered_decorations['everness:mineral_waters_under_lava_stone_spike'].place_on
lava_stone_spike_place_on = type(lava_stone_spike_place_on) == 'string' and { lava_stone_spike_place_on } or lava_stone_spike_place_on


local wall_vines = {
    c_everness_wall_vine_cave_cyan,
    c_everness_wall_vine_cave_violet,
    c_everness_wall_vine_cave_blue
}

local volcanic_spike_map = {
    c_everness_volcanic_rock,
    c_everness_volcanic_spike_1,
    c_everness_volcanic_spike_2,
    c_everness_volcanic_spike_3,
    c_everness_volcanic_spike_4,
    c_everness_volcanic_spike_5,
    c_everness_volcanic_spike_6,
    c_everness_volcanic_spike_7
}

local lava_stone_spike_map = {
    c_everness_mineral_cave_stone,
    c_everness_mineral_cave_stone_spike_1,
    c_everness_mineral_cave_stone_spike_2,
    c_everness_mineral_cave_stone_spike_3,
    c_everness_mineral_cave_stone_spike_4,
    c_everness_mineral_cave_stone_spike_5,
    c_everness_mineral_cave_stone_spike_6,
    c_everness_mineral_cave_stone_spike_7
}

minetest.set_gen_notify({ decoration = true }, {
    d_everness_mineral_waters_under_volcanic_spike,
    d_everness_mineral_waters_under_lava_stone_spike
})

Everness:add_to_queue_on_generated({
    name = 'everness:mineral_waters_under',
    can_run = function(biomemap)
        return table.indexof(biomemap, biome_id_everness_mineral_waters_under) ~= -1
    end,
    -- read/write to `data` what will be eventually saved (set_data)
    -- used for voxelmanip `data` manipulation
    on_data = function(minp, maxp, area, data, p2data, gennotify, rand, shared_args)
        --
        -- Lakes
        --
        for z = minp.z, maxp.z do
            for y = minp.y, maxp.y do
                for x = minp.x, maxp.x do
                    local ai = area:index(x, y, z)
                    local c_current = data[ai]

                    -- +Y, -Y, +X, -X, +Z, -Z
                    -- top, bottom, right, left, front, back
                    -- right
                    local c_right = data[ai + 1]
                    -- left
                    local c_left = data[ai - 1]
                    -- front
                    local c_front = data[ai + area.zstride]
                    -- back
                    local c_back = data[ai - area.zstride]

                    local keep_going = true
                    local while_count = 1
                    local max_dig_depth = 11

                    if
                        c_current == c_everness_mineral_lava_stone
                        and (
                            c_right == c_everness_mineral_lava_stone
                            or c_right == c_everness_mineral_cave_stone
                            or c_right == c_everness_lava_source
                        )
                        and (
                            c_left == c_everness_mineral_lava_stone
                            or c_left == c_everness_mineral_cave_stone
                            or c_left == c_everness_lava_source
                        )
                        and (
                            c_front == c_everness_mineral_lava_stone
                            or c_front == c_everness_mineral_cave_stone
                            or c_front == c_everness_lava_source
                        )
                        and (
                            c_back == c_everness_mineral_lava_stone
                            or c_back == c_everness_mineral_cave_stone
                            or c_back == c_everness_lava_source
                        )
                    then
                        -- dig below
                        while keep_going and while_count <= max_dig_depth do
                            local while_index = ai - area.ystride * while_count

                            if
                                -- below
                                data[while_index] == c_everness_mineral_cave_stone
                                and (
                                    -- right
                                    data[while_index + 1 + area.ystride] == c_everness_mineral_lava_stone
                                    or data[while_index + 1 + area.ystride] == c_everness_lava_source
                                    or data[while_index + 1 + area.ystride] == c_everness_mineral_cave_stone
                                )
                                and (
                                    -- left
                                    data[while_index - 1 + area.ystride] == c_everness_mineral_lava_stone
                                    or data[while_index - 1 + area.ystride] == c_everness_lava_source
                                    or data[while_index - 1 + area.ystride] == c_everness_mineral_cave_stone
                                )
                                and (
                                    -- front
                                    data[while_index + area.zstride + area.ystride] == c_everness_mineral_lava_stone
                                    or data[while_index + area.zstride + area.ystride] == c_everness_lava_source
                                    or data[while_index + area.zstride + area.ystride] == c_everness_mineral_cave_stone
                                )
                                and (
                                    -- back
                                    data[while_index - area.zstride + area.ystride] == c_everness_mineral_lava_stone
                                    or data[while_index - area.zstride + area.ystride] == c_everness_lava_source
                                    or data[while_index - area.zstride + area.ystride] == c_everness_mineral_cave_stone
                                )
                            then
                                data[while_index + area.ystride] = c_everness_lava_source
                            else
                                keep_going = false
                            end

                            while_count = while_count + 1
                        end
                    end
                end
            end
        end

        --
        -- Decorations
        --
        for y = minp.y, maxp.y do
            for z = minp.z, maxp.z do
                for x = minp.x, maxp.x do
                    local vi = area:index(x, y, z)

                    if
                        data[vi] == minetest.CONTENT_AIR
                        and (
                            data[vi + 1] == c_everness_mineral_cave_stone
                            or data[vi - 1] == c_everness_mineral_cave_stone
                            or data[vi + area.zstride] == c_everness_mineral_cave_stone
                            or data[vi - area.zstride] == c_everness_mineral_cave_stone
                        )
                        and rand:next(0, 100) <= 25
                    then
                        -- Decorate Walls
                        local dir = vector.zero()

                        if data[vi + 1] == c_everness_mineral_cave_stone then
                            dir.x = 1
                        end

                        if data[vi - 1] == c_everness_mineral_cave_stone then
                            dir.x = -1
                        end

                        if data[vi + area.zstride] == c_everness_mineral_cave_stone then
                            dir.z = 1
                        end

                        if data[vi - area.zstride] == c_everness_mineral_cave_stone then
                            dir.z = -1
                        end

                        local rand_wall_vine = wall_vines[rand:next(1, #wall_vines)]
                        data[vi] = rand_wall_vine
                        p2data[vi] = minetest.dir_to_wallmounted(dir)
                    end
                end
            end
        end

        --
        -- Spikes
        --
        for _, pos in ipairs(gennotify['decoration#' .. (d_everness_mineral_waters_under_volcanic_spike or '')] or {}) do
            local idx = area:indexp(pos)
            local idx_marker = idx + area.ystride
            local place_on_node_name = minetest.get_name_from_content_id(data[idx])

            if data[idx_marker] == c_everness_marker then
                -- remove marker
                data[idx_marker] = minetest.CONTENT_AIR

                if table.indexof(volcanic_spike_place_on, place_on_node_name) ~= -1 then
                    local min_height = 3
                    local max_height = 8
                    local indexes = Everness.find_content_in_vm_area(
                        vector.new(pos.x, pos.y + 1, pos.z),
                        vector.new(pos.x, pos.y + max_height, pos.z),
                        {
                            minetest.CONTENT_AIR
                        },
                        data,
                        area
                    )

                    -- For smallest spike we need space above at least 3)
                    if #indexes > min_height then
                        local height = rand:next(min_height, #indexes)
                        local start_index = #volcanic_spike_map - height + 1
                        local count = 0

                        for i = start_index, #volcanic_spike_map do
                            data[idx_marker + area.ystride * count] = volcanic_spike_map[i]
                            count = count + 1
                        end
                    end
                end
            end
        end

        for _, pos in ipairs(gennotify['decoration#' .. (d_everness_mineral_waters_under_lava_stone_spike or '')] or {}) do
            local idx = area:indexp(pos)
            local idx_marker = idx + area.ystride
            local place_on_node_name = minetest.get_name_from_content_id(data[idx])

            if data[idx_marker] == c_everness_marker then
                -- remove marker
                data[idx_marker] = minetest.CONTENT_AIR

                if table.indexof(lava_stone_spike_place_on, place_on_node_name) ~= -1 then
                    local min_height = 3
                    local max_height = 8
                    local indexes = Everness.find_content_in_vm_area(
                        vector.new(pos.x, pos.y + 1, pos.z),
                        vector.new(pos.x, pos.y + max_height, pos.z),
                        {
                            minetest.CONTENT_AIR
                        },
                        data,
                        area
                    )

                    -- For smallest spike we need space above at least 3)
                    if #indexes > min_height then
                        local height = rand:next(min_height, #indexes)
                        local start_index = #lava_stone_spike_map - height + 1
                        local count = 0

                        for i = start_index, #lava_stone_spike_map do
                            data[idx_marker + area.ystride * count] = lava_stone_spike_map[i]
                            count = count + 1
                        end
                    end
                end
            end
        end
    end,
    -- read-only (but cant and should not manipulate) voxelmanip `data`
    -- used for `place_schematic_on_vmanip` which will invalidate `data`
    -- therefore we are doing it after we set the data
    after_set_data = function(minp, maxp, vm, area, data, p2data, gennotify, rand, shared_args)
    end,
    -- Cannot read/write voxelmanip or its data
    -- Used for direct manipulation of the world chunk nodes where the
    -- definitions of nodes are available and node callback can be executed
    -- or e.g. for `minetest.fix_light`
    after_write_to_map = function(shared_args, gennotify, rand)
    end
})