--[[
    Adds environmental spawners to the map. When enabled, the spawners will be added to newly generated Dungeons (Uruk Hai) and Temples (Spider). They are dropping a real mob spawner by change (very small chance).
    Copyright (C) 2016 - 2023 SaKeL <juraj.vajda@gmail.com>

    This library is free software; you can redistribute it and/or
    modify it pos 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.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to juraj.vajda@gmail.com
--]]

--
-- * CREATE ALL SPAWNERS NODES *
--

function spawners_env.create(mob_name, mod_prefix, size, offset, mesh, texture, night_only, sound_custom, env, boss)

    --
    -- DUMMY INSIDE THE SPAWNER
    --

    local dummy_definition = {
        hp_max = 1,
        physical = true,
        collisionbox = { 0, 0, 0, 0, 0, 0 },
        visual = 'mesh',
        visual_size = size,
        mesh = mesh,
        textures = texture,
        makes_footstep_sound = false,
        timer = 0,
        automatic_rotate = math.pi * -3,
        m_name = 'dummy'
    }

    dummy_definition.on_activate = function(self)
        self.object:set_velocity({ x = 0, y = 0, z = 0 })
        self.object:set_acceleration({ x = 0, y = 0, z = 0 })
        self.object:set_armor_groups({ immortal = 1 })
    end

    -- remove dummy after dug up the spawner
    dummy_definition.on_step = function(self, dtime)
        self.timer = self.timer + dtime
        local n = minetest.get_node_or_nil(self.object:get_pos())
        if self.timer > 2 then
            if n and n.name and n.name ~= 'spawners_env:' .. mod_prefix .. '_' .. mob_name .. '_spawner_active' then
                self.object:remove()
            end
        end
    end

    minetest.register_entity('spawners_env:dummy_' .. mod_prefix .. '_' .. mob_name, dummy_definition)

    --
    -- ACTIVE SPAWNER ENV
    --

    minetest.register_node('spawners_env:' .. mod_prefix .. '_' .. mob_name .. '_spawner_active', {
        description = mod_prefix .. '_' .. mob_name .. ' spawner active env',
        paramtype = 'light',
        light_source = 4,
        paramtype2 = 'glasslikeliquidlevel',
        drawtype = 'glasslike_framed_optional',
        walkable = true,
        sounds = default.node_sound_metal_defaults(),
        damage_per_second = 4,
        sunlight_propagates = true,
        tiles = {
            {
                name = 'spawners_env_spawner_animated_16.png',
                animation = {
                    type = 'vertical_frames',
                    aspect_w = 16,
                    aspect_h = 16,
                    length = 2.0
                },
            }
        },
        is_ground_content = true,
        groups = {
            -- MTG
            cracky = 1,
            level = 2,
            igniter = 1,
            not_in_creative_inventory = 1
        },
        on_timer = function(pos, elapsed)
            spawners_env.check_for_spawning_timer(pos, mob_name, night_only, mod_prefix, sound_custom, env, boss)
            return false
        end,
        drop = {
            max_items = 1,
            items = {
                { items = { 'spawners_mobs:' .. mod_prefix .. '_' .. mob_name .. '_spawner' }, rarity = 20 }
            }
        },
        on_construct = function(pos)
            pos.y = pos.y + offset
            minetest.add_entity(pos, 'spawners_env:dummy_' .. mod_prefix .. '_' .. mob_name)
        end,
    })

    --
    -- WAITING SPAWNER ENV
    --

    -- waiting for light - everything is ok but too much light or not enough light
    minetest.register_node('spawners_env:' .. mod_prefix .. '_' .. mob_name .. '_spawner_waiting', {
        description = mod_prefix .. '_' .. mob_name .. ' spawner waiting env',
        paramtype = 'light',
        light_source = 2,
        paramtype2 = 'glasslikeliquidlevel',
        drawtype = 'glasslike_framed_optional',
        walkable = true,
        sounds = default.node_sound_metal_defaults(),
        sunlight_propagates = true,
        tiles = {
            {
                name = 'spawners_env_spawner_waiting_animated_16.png',
                animation = {
                    type = 'vertical_frames',
                    aspect_w = 16,
                    aspect_h = 16,
                    length = 2.0
                },
            }
        },
        is_ground_content = true,
        groups = {
            -- MTG
            cracky = 1,
            level = 2,
            not_in_creative_inventory = 1
        },
        on_timer = function(pos, elapsed)
            spawners_env.check_for_spawning_timer(pos, mob_name, night_only, mod_prefix, sound_custom, env, boss)
            return false
        end,
        drop = {
            max_items = 1,
            items = {
                { items = { 'spawners_mobs:' .. mod_prefix .. '_' .. mob_name .. '_spawner' }, rarity = 20 }
            }
        },
    })

    --
    -- INACTIVE SPAWNER (DEFAULT) ENV
    --

    minetest.register_node('spawners_env:' .. mod_prefix .. '_' .. mob_name .. '_spawner', {
        description = mod_prefix .. '_' .. mob_name .. ' spawner env',
        paramtype = 'light',
        paramtype2 = 'glasslikeliquidlevel',
        drawtype = 'glasslike_framed_optional',
        walkable = true,
        sounds = default.node_sound_metal_defaults(),
        sunlight_propagates = true,
        tiles = { 'spawners_env_spawner_16.png' },
        is_ground_content = true,
        groups = {
            -- MTG
            cracky = 1,
            level = 2,
            not_in_creative_inventory = 0
        },
        stack_max = 1,
        drop = {
            max_items = 1,
            items = {
                { items = { 'spawners_mobs:' .. mod_prefix .. '_' .. mob_name .. '_spawner' }, rarity = 20 }
            }
        },
        on_construct = function(pos)
            spawners_env.check_for_spawning_timer(pos, mob_name, night_only, mod_prefix, sound_custom, env, boss)
        end,
    })

    --
    -- * LBM *
    --

    minetest.register_lbm({
        name = 'spawners_env:check_for_spawning_timer',
        nodenames = {
            'spawners_env:' .. mod_prefix .. '_' .. mob_name .. '_spawner',
            'spawners_env:' .. mod_prefix .. '_' .. mob_name .. '_spawner_active',
            'spawners_env:' .. mod_prefix .. '_' .. mob_name .. '_spawner_waiting'
        },
        action = function(pos)
            spawners_env.check_for_spawning_timer(pos, mob_name, night_only, mod_prefix, sound_custom, env, boss)
        end
    })
end

--
-- * check for spawning *
--
function spawners_env.check_for_spawning_timer(pos, mob_name, night_only, mod_prefix, sound_custom, env, boss)

    local random_pos = spawners_env.check_node_status(pos, mob_name, night_only, boss)

    local node = minetest.get_node_or_nil(pos)

    -- minetest.log('action', '[Mod][Spawners] checking for: ' .. mob_name .. ' at ' .. minetest.pos_to_string(pos))

    if random_pos then
        -- print('try to spawn another mob at: ' .. minetest.pos_to_string(random_pos))

        local mobs_counter_table = {}
        local mobs_check_radius
        local mobs_max
        mobs_counter_table[mob_name] = 0

        if boss then
            mobs_max = 1
            mobs_check_radius = 35
        else
            mobs_max = 3
            mobs_check_radius = 10
        end

        -- collect all spawned mobs around area
        for _, obj in ipairs(minetest.get_objects_inside_radius(pos, mobs_check_radius)) do

            if obj:get_luaentity() ~= nil then

                -- get entity name
                local name_split = string.split(obj:get_luaentity().name, ':')

                if name_split[2] == mob_name then

                    mobs_counter_table[mob_name] = mobs_counter_table[mob_name] + 1

                end

            end

        end

        -- print(mob_name .. ' : ' .. mobs_counter_table[mob_name])

        -- enough place to spawn more mobs
        if mobs_counter_table[mob_name] < mobs_max then
            -- make sure the right node status is shown
            if node.name ~= 'spawners_env:' .. mod_prefix .. '_' .. mob_name .. '_spawner_active' then
                minetest.set_node(pos, { name = 'spawners_env:' .. mod_prefix .. '_' .. mob_name .. '_spawner_active' })
            end

            if boss then
                -- color: deep orange
                minetest.chat_send_all(minetest.colorize('#FF5722', 'Balrog has spawned to this World!'))
            end

            spawners_env.start_spawning(random_pos, 1, 'spawners_env:' .. mob_name, mod_prefix, sound_custom)
        else
            -- print('too many mobs: waiting')
            -- waiting status
            if node.name ~= 'spawners_env:' .. mod_prefix .. '_' .. mob_name .. '_spawner_waiting' then
                minetest.set_node(pos, { name = 'spawners_env:' .. mod_prefix .. '_' .. mob_name .. '_spawner_waiting' })
            end
        end

    else
        -- print('no random_pos found: waiting')
        -- waiting status
        if node.name ~= 'spawners_env:' .. mod_prefix .. '_' .. mob_name .. '_spawner_waiting' then
            minetest.set_node(pos, { name = 'spawners_env:' .. mod_prefix .. '_' .. mob_name .. '_spawner_waiting' })
        end
    end
    -- 6 hours = 21600 seconds
    -- 4 hours = 14400 seconds
    -- 1 hour = 3600 seconds
    if boss then
        minetest.get_node_timer(pos):start(3600)
    else
        minetest.get_node_timer(pos):start(math.random(5, 15))
    end
end

--
-- CALL 'CREATE' FOR ALL SPAWNERS
--

for i, mob_table in ipairs(spawners_env.mob_tables) do
    if mob_table then

        spawners_env.create(mob_table.name, mob_table.mod_prefix, mob_table.dummy_size, mob_table.dummy_offset, mob_table.dummy_mesh, mob_table.dummy_texture, mob_table.night_only, mob_table.sound_custom, mob_table.env, mob_table.boss)
    end
end