local Chrono_table = require 'maps.chronosphere.table'
local Balance = require 'maps.chronosphere.balance'
local Difficulty = require 'modules.difficulty_vote'
local Rand = require 'maps.chronosphere.random'
local random = math.random
local Public = {}
local Worlds = {}

Worlds[1] = {
    world_id = 1,
    map = require 'maps.chronosphere.worlds.basic',
    variants = {
        [1] = {id = 1, min = 1, weight = 1, name = {'chronosphere.map_1_1'}, fe = 6, cu = 1, c = 1, s = 1, u = 0, o = 1, biters = 16, moisture = -0.2, fa = 1},
        [2] = {id = 2, min = 1, weight = 1, name = {'chronosphere.map_1_2'}, fe = 1, cu = 6, c = 1, s = 1, u = 0, o = 1, biters = 16, moisture = 0.2, fa = 1},
        [3] = {id = 3, min = 2, weight = 1, name = {'chronosphere.map_1_3'}, fe = 1, cu = 1, c = 1, s = 6, u = 0, o = 1, biters = 16, moisture = -0.2, fa = 1},
        [4] = {id = 4, min = 4, weight = 1, name = {'chronosphere.map_1_4'}, fe = 1, cu = 1, c = 1, s = 1, u = 0, o = 6, biters = 16, moisture = 0.1, fa = 1},
        [5] = {id = 5, min = 6, weight = 1, name = {'chronosphere.map_1_5'}, fe = 1, cu = 1, c = 1, s = 1, u = 6, o = 1, biters = 16, moisture = -0.2, fa = 1},
        [6] = {id = 6, min = 2, weight = 1, name = {'chronosphere.map_1_6'}, fe = 1, cu = 1, c = 6, s = 1, u = 0, o = 1, biters = 16, moisture = 0, fa = 1},
        [7] = {id = 7, min = 4, weight = 1, name = {'chronosphere.map_1_7'}, fe = 2, cu = 2, c = 2, s = 2, u = 4, o = 3, biters = 40, moisture = 0.2, fa = 0},
        [8] = {id = 8, min = 2, weight = 1, name = {'chronosphere.map_1_8'}, fe = 1, cu = 1, c = 1, s = 1, u = 0, o = 0, biters = 16, moisture = 0.1, fa = 4},
        [9] = {id = 9, min = 1, weight = 1, name = {'chronosphere.map_1_9'}, fe = 2, cu = 2, c = 2, s = 2, u = 0, o = 2, biters = 10, moisture = 0, fa = 1},
        [10] = {id = 10, min = 0, weight = 0, name = {'chronosphere.map_1_10'}, fe = 4, cu = 3, c = 4, s = 2, u = 0, o = 0, biters = 1, moisture = -0.3, fa = 0},
        [11] = {id = 11, min = 6, weight = 1, name = {'chronosphere.map_1_11'}, fe = 3, cu = 3, c = 2, s = 3, u = 0, o = 0, biters = 6, moisture = -0.5, fa = 4}
    },
    modifiers = {},
    default_tile = 'grass-1'
}
Worlds[2] = {
    world_id = 2,
    map = require 'maps.chronosphere.worlds.scrapyard',
    variants = {
        [1] = {id = 1, min = 1, weight = 1, name = {'chronosphere.map_2_1'}, fe = 0, cu = 0, c = 0, s = 0, u = 0, o = 0, biters = 0, moisture = -0.2, fa = 4},
        [2] = {id = 2, min = 15, weight = 0, name = {'chronosphere.map_2_2'}, fe = 0, cu = 0, c = 0, s = 0, u = 0, o = 0, biters = 0, moisture = -0.2, fa = 1},
        [3] = {id = 3, min = 4, weight = 1, name = {'chronosphere.map_2_3'}, fe = 0, cu = 0, c = 0, s = 0, u = 0, o = 0, biters = 0, moisture = -0.2, fa = 10}
    },
    modifiers = {
        ores = 'none'
    },
    default_tile = 'dirt-1'
}
Worlds[3] = {
    world_id = 3,
    map = require 'maps.chronosphere.worlds.caveworld',
    variants = {
        [1] = {id = 1, min = 2, weight = 1, name = {'chronosphere.map_3_1'}, fe = 0, cu = 0, c = 0, s = 0, u = 0, o = 0, biters = 6, moisture = -0.2, fa = 0},
        [2] = {id = 2, min = 4, weight = 1, name = {'chronosphere.map_3_2'}, fe = 0, cu = 0, c = 0, s = 0, u = 0, o = 0, biters = 18, moisture = -0.4, fa = 0}
    },
    modifiers = {
        daytime = 0.35,
        dayspeed = 'static'
    },
    default_tile = 'dirt-6'
}
Worlds[4] = {
    world_id = 4,
    map = require 'maps.chronosphere.worlds.forest',
    variants = {
        [1] = {id = 1, min = 1, weight = 1, name = {'chronosphere.map_4_1'}, fe = 0, cu = 0, c = 0, s = 0, u = 0, o = 0, biters = 6, moisture = 0.4, fa = 0}
    },
    modifiers = {},
    default_tile = 'grass-1'
}
Worlds[5] = {
    world_id = 5,
    map = require 'maps.chronosphere.worlds.maze',
    variants = {
        [1] = {id = 1, min = 2, weight = 1, name = {'chronosphere.map_5_1'}, fe = 3, cu = 3, c = 3, s = 3, u = 1, o = 2, biters = 16, moisture = -0.1, fa = 2}
    },
    modifiers = {},
    default_tile = 'grass-1'
}
Worlds[6] = {
    world_id = 6,
    map = require 'maps.chronosphere.worlds.riverlands',
    variants = {
        [1] = {id = 1, min = 2, weight = 1, name = {'chronosphere.map_6_1'}, fe = 2, cu = 2, c = 3, s = 1, u = 0, o = 0, biters = 16, moisture = 0.5, fa = 0}
    },
    modifiers = {},
    default_tile = 'grass-1'
}
Worlds[7] = {
    world_id = 7,
    map = require 'maps.chronosphere.worlds.fishmarket',
    variants = {
        [1] = {id = 1, min = 20, weight = 0, name = {'chronosphere.map_7_1'}, fe = 0, cu = 0, c = 0, s = 0, u = 0, o = 0, biters = 100, moisture = 0.0, fa = 0}
    },
    modifiers = {
        ores = 'none',
        dayspeed = 'static',
        daytime = 0
    },
    default_tile = 'grass-1'
}
Worlds[8] = {
    world_id = 8,
    map = require 'maps.chronosphere.worlds.swamp',
    variants = {
        [1] = {id = 1, min = 6, weight = 1, name = {'chronosphere.map_8_1'}, fe = 2, cu = 0, c = 3, s = 0, u = 0, o = 2, biters = 16, moisture = 0.5, fa = 0}
    },
    modifiers = {},
    default_tile = 'grass-1'
}

local time_speed_variants = {
    static = {name = {'chronosphere.daynight_static'}, timer = 0},
    normal = {name = {'chronosphere.daynight_normal'}, timer = 150},
    slow = {name = {'chronosphere.daynight_slow'}, timer = 300},
    superslow = {name = {'chronosphere.daynight_superslow'}, timer = 600},
    fast = {name = {'chronosphere.daynight_fast'}, timer = 80},
    superfast = {name = {'chronosphere.daynight_superfast'}, timer = 40}
}

local time_speed_weights = {static = 1, normal = 4, slow = 3, superslow = 2, fast = 3, superfast = 2}

local ore_richness_variants = {
    vrich = {name = {'chronosphere.ore_richness_very_rich'}, factor = 2.5},
    rich = {name = {'chronosphere.ore_richness_rich'}, factor = 1.5},
    normal = {name = {'chronosphere.ore_richness_normal'}, factor = 1},
    poor = {name = {'chronosphere.ore_richness_poor'}, factor = 0.75},
    vpoor = {name = {'chronosphere.ore_richness_very_poor'}, factor = 0.5},
    none = {name = {'chronosphere.ore_richness_none'}, factor = 0}
}

local function special_world()
    local objective = Chrono_table.get_table()
    local special = {yes = false, chosen_id = nil, chosen_variant_id = nil, ores = nil, dayspeed = nil, daytime = nil}
    if objective.game_lost then --start map
        special.yes = true
        special.chosen_id = 1
        special.chosen_variant_id = 10
        special.ores = ore_richness_variants['rich']
        special.dayspeed = time_speed_variants['normal']
        special.daytime = 0
        return special
    end
    if objective.config.jumpfailure == true then -- danger event
        if objective.chronojumps == 19 or objective.chronojumps == 26 or objective.chronojumps == 33 or objective.chronojumps == 41 then
            special.yes = true
            special.chosen_id = 2
            special.chosen_variant_id = 2
            special.ores = ore_richness_variants['none']
            special.dayspeed = time_speed_variants['static']
            special.daytime = 0.15
            return special
        end
    end
    if objective.upgrades[16] == 1 then -- fish market
        special.yes = true
        special.chosen_id = 7
        special.chosen_variant_id = 1
        special.ores = ore_richness_variants['none']
        special.dayspeed = time_speed_variants['static']
        special.daytime = 0.05
        return special
    end
    return special
end

local function get_modifiers(world_id)
    local modifier = {ores = nil, dayspeed = nil, daytime = nil}
    if Worlds[world_id].modifiers.ores then
        modifier.ores = ore_richness_variants[Worlds[world_id].modifiers.ores]
    end
    if Worlds[world_id].modifiers.dayspeed then
        modifier.dayspeed = time_speed_variants[Worlds[world_id].modifiers.dayspeed]
    end
    if Worlds[world_id].modifiers.daytime then
        modifier.daytime = Worlds[world_id].modifiers.daytime
    end
    return modifier
end

function Public.determine_world(optional_choice)
    local objective = Chrono_table.get_table()
    local difficulty = Difficulty.get().difficulty_vote_value
    local chosen_id
    local chosen_variant_id
    local ores = Rand.raffle(ore_richness_variants, Balance.ore_richness_weights(difficulty))
    local dayspeed = Rand.raffle(time_speed_variants, time_speed_weights)
    local daytime = random(0, 100) / 100
    local special = special_world()
    if special.yes then
        chosen_id = special.chosen_id
        chosen_variant_id = special.chosen_variant_id
        if special.ores then
            ores = special.ores
        end
        if special.dayspeed then
            dayspeed = special.dayspeed
        end
        if special.daytime then
            daytime = special.daytime
        end
        objective.world = {
            id = chosen_id,
            variant = Worlds[chosen_id].variants[chosen_variant_id],
            default_tile = Worlds[chosen_id].default_tile or 'grass-1',
            ores = ores,
            dayspeed = dayspeed,
            daytime = daytime
        }
        return
    end

    local choices = {types = {}, weights = {}}
    for _, world in pairs(Worlds) do
        table.insert(choices.types, world.world_id)
        local weight = 0
        for _, variant in pairs(world.variants) do
            if objective.chronojumps >= variant.min then
                weight = weight + variant.weight
            end
        end
        table.insert(choices.weights, weight)
    end
    ::retry::
    if Worlds[tonumber(optional_choice)] then
        chosen_id = tonumber(optional_choice)
    else
        chosen_id = Rand.raffle(choices.types, choices.weights)
    end
    local variant_choices = {types = {}, weights = {}}
    for _, variant in pairs(Worlds[chosen_id].variants) do
        if objective.chronojumps >= variant.min then
            table.insert(variant_choices.types, variant.id)
            table.insert(variant_choices.weights, variant.weight)
        end
    end
    if #variant_choices.types < 1 then
        optional_choice = nil
        goto retry
    end
    chosen_variant_id = Rand.raffle(variant_choices.types, variant_choices.weights)
    local modifiers = get_modifiers(chosen_id)
    if modifiers.ores then
        ores = modifiers.ores
    end
    if modifiers.dayspeed then
        dayspeed = modifiers.dayspeed
    end
    if modifiers.daytime then
        daytime = modifiers.daytime
    end
    if objective.upgrades[13] == 1 and ores == ore_richness_variants['vpoor'] then
        ores = ore_richness_variants['poor']
    end
    if objective.upgrades[14] == 1 and (ore_richness_variants['vpoor'] or ore_richness_variants['poor']) then
        ores = ore_richness_variants['normal']
    end
    objective.world = {
        id = chosen_id,
        variant = Worlds[chosen_id].variants[chosen_variant_id],
        default_tile = Worlds[chosen_id].default_tile,
        ores = ores,
        dayspeed = dayspeed,
        daytime = daytime
    }
end

local function process_chunk(surface, left_top)
    local objective = Chrono_table.get_table()
    if not surface then
        return
    end
    if not surface.valid then
        return
    end
    if objective.upgrades[27] == 1 then
        game.forces.player.chart(surface, {{left_top.x + 16, left_top.y + 16}, {left_top.x + 16, left_top.y + 16}})
    end
    local world = objective.world
    local level_depth = 960
    if world.id == 7 then
        level_depth = 2176
    end
    if left_top.x >= level_depth * 0.5 or left_top.y >= level_depth * 0.5 then
        return
    end
    if left_top.x < level_depth * -0.5 or left_top.y < level_depth * -0.5 then
        return
    end
    Worlds[world.id].map(world.variant, surface, left_top)
    return
end

local function on_chunk_generated(event)
    if string.sub(event.surface.name, 0, 12) ~= 'chronosphere' then
        return
    end
    process_chunk(event.surface, event.area.left_top)
end

local Event = require 'utils.event'
Event.add(defines.events.on_chunk_generated, on_chunk_generated)

return Public