diff --git a/.gitignore b/.gitignore
index 5c8a6ca..ea6fef4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,7 +2,10 @@
 
 !.github/
 !.github/workflows
+
 !src/
+!src/config/
+!src/config/mapping
 
 !.editorconfig
 !openttd.cfg
diff --git a/src/config/config_type.v b/src/config/config_type.v
new file mode 100644
index 0000000..adbecff
--- /dev/null
+++ b/src/config/config_type.v
@@ -0,0 +1,19 @@
+module config
+
+import config.mapping
+
+pub enum ConfigType {
+	openttd
+	private
+	secrets
+	// Other config files are not handled by this tool
+	//  because they are not useful for dedicated servers.
+}
+
+fn (ct ConfigType) mapping() mapping.Mapping {
+	return match ct {
+		.openttd { mapping.openttd_config }
+		.private { mapping.private_config }
+		.secrets { mapping.secrets_config }
+	}
+}
diff --git a/src/config/configs.v b/src/config/configs.v
new file mode 100644
index 0000000..5e2a4a0
--- /dev/null
+++ b/src/config/configs.v
@@ -0,0 +1,68 @@
+module config
+
+import strings
+
+[noinit]
+pub struct OpenTTDConfig {
+	content map[string]map[string]string
+	@type   ConfigType
+}
+
+pub fn (oc OpenTTDConfig) str() string {
+	mut config_string := strings.new_builder(12800)
+
+	for section, section_content in oc.content {
+		config_string.write_string('[${section}]\n')
+
+		for field, value in section_content {
+			config_string.write_string('${field} = ${value}\n')
+		}
+	}
+
+	return config_string.str()
+}
+
+pub struct ManageTTDConfig {
+	content map[string]map[string]string
+	@type   ConfigType
+}
+
+// TODO: validate values.
+pub fn (mc ManageTTDConfig) validate() ! {
+	mapping := mc.@type.mapping()
+
+	for section, section_content in mc.content {
+		if section !in mapping {
+			return error('Invalid section: ${section}')
+		}
+
+		for field, _ in section_content {
+			if field !in mapping[section] {
+				return error('Invalid key: ${field}')
+			}
+		}
+	}
+}
+
+pub fn (mc ManageTTDConfig) to_openttd_config() !OpenTTDConfig {
+	mc.validate()!
+
+	mapping := mc.@type.mapping()
+
+	mut openttd_config := map[string]map[string]string{}
+
+	for section, section_content in mc.content {
+		section_mapping := mapping[section]
+
+		for field, value in section_content {
+			key_mapping := section_mapping[field]
+
+			openttd_config[key_mapping.section()][key_mapping.field()] = key_mapping.transform(value)
+		}
+	}
+
+	return OpenTTDConfig{
+		content: openttd_config
+		@type: mc.@type
+	}
+}
diff --git a/src/config/mapping/mapping.v b/src/config/mapping/mapping.v
new file mode 100644
index 0000000..3f18c8e
--- /dev/null
+++ b/src/config/mapping/mapping.v
@@ -0,0 +1,54 @@
+module mapping
+
+import config
+
+pub type Mapping = map[string]map[string]Map
+
+pub fn (m Mapping) to_managettd_config() config.ManageTTDConfig {
+	mut config_map := map[string]map[string]string{}
+
+	for section, fields in m {
+		config_map[section] = map[string]string{}
+
+		for field, map in fields {
+			config_map[section][field] = map.transformed_default_value()
+		}
+	}
+
+	return config.ManageTTDConfig{
+		content: config_map
+		@type: // TODO
+	}
+}
+
+[noinit]
+pub struct Map {
+	equivalent    []string [required]
+	documentation string   [required]
+	default_value string   [required]
+pub:
+	transform fn (string) string = fn (s string) string {
+		return s
+	}
+}
+
+pub fn (m Map) section() string {
+	return m.equivalent[0]
+}
+
+pub fn (m Map) field() string {
+	return m.equivalent[1]
+}
+
+pub fn (m Map) transformed_default_value() string {
+	return m.transform(m.default_value)
+}
+
+pub fn (m Map) str() string {
+	comment := '; ' + m.documentation.split_into_lines().join('; ')
+
+	field := m.field()
+	value := m.transformed_default_value()
+
+	return '${comment}\n${field} = ${value}'
+}
diff --git a/src/config/mapping/mappings.v b/src/config/mapping/mappings.v
new file mode 100644
index 0000000..24eade8
--- /dev/null
+++ b/src/config/mapping/mappings.v
@@ -0,0 +1,56 @@
+module mapping
+
+pub const openttd_config = Mapping({
+	'ratelimits': {
+		'maximum_initialization_time': Map{
+			equivalent: 'network.max_init_time'
+			documentation: 'The time the client has to initialize the game in seconds.'
+			default_value: '5'
+			transform: seconds_to_ticks
+		}
+		'maximum_join_time':           Map{
+			equivalent: 'network.max_join_time'
+			documentation: 'The time the client has to join the server in seconds.'
+			default_value: '20'
+			transform: seconds_to_ticks
+		}
+		'maximum_download_time':       Map{
+			equivalent: 'network.max_download_time'
+			documentation: 'The time the client has to download the map in seconds.'
+			default_value: '300'
+			transform: seconds_to_ticks
+		}
+		'maximum_password_time':       Map{
+			equivalent: 'network.max_password_time'
+			documentation: 'The time the client has to enter the server password in seconds.'
+			default_value: '600'
+			transform: seconds_to_ticks
+		}
+		'maximum_lag_time':            Map{
+			equivalent: 'network.max_lag_time'
+			documentation: 'The time the client can lag behind the server in seconds.'
+			default_value: '20'
+			transform: seconds_to_ticks
+		}
+	}
+	'server':     {
+		'is_public': Map{
+			equivalent: 'network.server_game_type'
+			documentation: 'Whether if the server is public. True means the server can be joined from the server list.'
+			default_value: 'true'
+			transform: boolean_to_custom_value(['private', 'public'])
+		}
+	}
+	'autoclean':  {
+		'enabled': Map{
+			equivalent: 'network.autoclean_companies'
+			documentation: 'Whether if the server should automatically clean up companies.
+Other autoclean settings only have effect if this is set to true.'
+			default_value: 'false'
+		}
+	}
+})
+
+pub const private_config = Mapping{}
+
+pub const secrets_config = Mapping{}
diff --git a/openttd.cfg b/src/config/mapping/openttd.cfg
similarity index 99%
rename from openttd.cfg
rename to src/config/mapping/openttd.cfg
index 2d18ce2..c9261ce 100644
--- a/openttd.cfg
+++ b/src/config/mapping/openttd.cfg
@@ -18,7 +18,7 @@ pause_on_join = true
 server_port = 3979
 server_admin_port = 3977
 server_admin_chat = true
-server_game_type = local
+;server_game_type = local
 autoclean_companies = false
 autoclean_unprotected = 12
 autoclean_protected = 36
diff --git a/src/config/mapping/transformers.v b/src/config/mapping/transformers.v
new file mode 100644
index 0000000..9f088ee
--- /dev/null
+++ b/src/config/mapping/transformers.v
@@ -0,0 +1,12 @@
+module mapping
+
+fn seconds_to_ticks(s string) string {
+	return (s.int() * 1000 / 30).str()
+}
+
+fn boolean_to_custom_value(values []string) fn (string) string {
+	// [false, true]
+	return fn [values] (s string) string {
+		return values[usize(s.to_lower().bool())]
+	}
+}
diff --git a/src/main.v b/src/main.v
index edf2574..75ffa9f 100644
--- a/src/main.v
+++ b/src/main.v
@@ -1,5 +1,5 @@
 module main
 
 fn main() {
-	println('Hello World!')
+	println()
 }
diff --git a/src/mappings.v b/src/mappings.v
deleted file mode 100644
index 4e9fad5..0000000
--- a/src/mappings.v
+++ /dev/null
@@ -1,65 +0,0 @@
-module main
-
-type MappingValue = Comment | Field
-
-[params]
-struct Field {
-	// The name of the field in openttd.cfg file.
-	// This is the thing OpenTTD seees.
-	name string [required]
-	// The docs for the field.
-	docs string [required]
-	// The value of the field.
-	value string [required]
-	// Transforms the value.
-	transformer fn (string) string = fn (s string) string {
-		return s
-	}
-}
-
-type Comment = string
-
-fn field(f Field) MappingValue {
-	return f
-}
-
-fn comment(c Comment) MappingValue {
-	return c
-}
-
-fn seconds_to_ticks(s string) string {
-	return (s.int() * 1000 / 30).str()
-}
-
-const mappings = {
-	'time_limits.maximum_initialization_time': field(
-		name: 'network.max_init_time'
-		docs: 'The time the client has to initialize the game in seconds.'
-		value: '5'
-		transformer: seconds_to_ticks
-	)
-	'time_limits.maximum_join_time':           field(
-		name: 'network.max_join_time'
-		docs: 'The time the client has to join the server in seconds.'
-		value: '20'
-		transformer: seconds_to_ticks
-	)
-	'time_limits.maximum_download_time':       field(
-		name: 'network.max_download_time'
-		docs: 'The time the client has to download the map in seconds.'
-		value: '300'
-		transformer: seconds_to_ticks
-	)
-	'time_limits.maximum_password_time':       field(
-		name: 'network.max_password_time'
-		docs: 'The time the client has to enter the server password in seconds.'
-		value: '600'
-		transformer: seconds_to_ticks
-	)
-	'time_limits.maximum_lag_time':            field(
-		name: 'network.max_lag_time'
-		docs: 'The time the client can lag behind the server in seconds.'
-		value: '20'
-		transformer: seconds_to_ticks
-	)
-}