Archipelago/worlds/generic/docs/triggers_en.md

# Archipelago Triggers Guide

This guide details the use of the Archipelago YAML trigger system. This guide is intended for a more advanced user with
more in-depth knowledge of Archipelago YAML options as well as experience editing YAML files. This guide should take
about 5 minutes to read.

## What are triggers?

Triggers allow you to customize your game settings by allowing you to define one or many options which only occur under
specific conditions. These are essentially "if, then" statements for options in your game. A good example of what you
can do with triggers is the custom mercenary mode YAML that was created using entirely triggers and plando.

Mercenary mode
YAML: [Mercenary Mode YAML on GitHub](https://github.com/alwaysintreble/Archipelago-yaml-dump/blob/main/Snippets/Mercenary%20Mode%20Snippet.yaml)

For more information on plando you can reference the general plando guide or the Link to the Past plando guide.

General plando guide: [Archipelago Plando Guide](/tutorial/Archipelago/plando/en)

Link to the Past plando guide: [LttP Plando Guide](/tutorial/A%20Link%20to%20the%20Past/plando/en)

## Trigger use

Triggers may be defined in either the root or in the relevant game sections. Generally, The best place to do this is the
bottom of the yaml for clear organization.

- Triggers comprise the trigger section and then each trigger must have an `option_category`, `option_name`, and
  `option_result` from which it will react to and then an `options` section for the definition of what will happen.
- `option_category` is the defining section from which the option is defined in.
    - Example: `A Link to the Past`
    - This is the root category the option is located in. If the option you're triggering off of is in root then you
      would use `null`, otherwise this is the game for which you want this option trigger to activate.
- `option_name` is the option setting from which the triggered choice is going to react to.
    - Example: `shop_item_slots`
    - This can be any option from any category defined in the yaml file in either root or a game section.
- `option_result` is the result of this option setting from which you would like to react.
    - Example: `15`
    - Each trigger must be used for exactly one option result. If you would like the same thing to occur with multiple
      results you would need multiple triggers for this.
- `options` is where you define what will happen when this is detected. This can be something as simple as ensuring
  another option also gets selected or placing an item in a certain location. It is possible to have multiple things
  happen in this section.
    - Example:
  ```yaml
  A Link to the Past:
    start_inventory: 
      Rupees (300): 2
  ```

This format must be:

  ```yaml
  root option:
    option to change:
      desired result
  ```

### Examples

The above examples all together will end up looking like this:

  ```yaml
  triggers:
    - option_category: A Link to the Past
      option_name: shop_item_slots
      option_result: 15
      options:
        A Link to the Past:
          start_inventory:
            Rupees(300): 2
  ```

For this example if the generator happens to roll 15 shuffled in shop item slots for your game you'll be granted 600
rupees at the beginning. These can also be used to change other options.

For example:

  ```yaml
  triggers:
    - option_category: Timespinner
      option_name: SpecificKeycards
      option_result: true
      options:
        Timespinner:
          Inverted: true
  ```

In this example if your world happens to roll SpecificKeycards then your game will also start in inverted.

It is also possible to use imaginary names in options to trigger specific settings. You can use these made up names in
either your main options or to trigger from another trigger. Currently, this is the only way to trigger on "setting 1
AND setting 2".

For example:

  ```yaml
  triggers:
    - option_category: Secret of Evermore
      option_name: doggomizer
        option_result: pupdunk
        options:
          Secret of Evermore:
            difficulty:
              normal: 50
              pupdunk_hard: 25
              pupdunk_mystery: 25
            exp_modifier:
              150: 50
              200: 50
      - option_category: Secret of Evermore
        option_name: difficulty
        option_result: pupdunk_hard
        options:
          Secret of Evermore:
            fix_wings_glitch: false
            difficulty: hard
      - option_category: Secret of Evermore
        option_name: difficulty
        option_result: pupdunk_mystery
        options:
          Secret of Evermore:
            fix_wings_glitch: false
            difficulty: mystery
  ```

In this example (thanks to @Black-Sliver) if the `pupdunk` option is rolled then the difficulty values will be rolled
again using the new options `normal`, `pupdunk_hard`, and `pupdunk_mystery`, and the exp modifier will be rerolled using
new weights for 150 and 200. This allows for two more triggers that will only be used for the new `pupdunk_hard`
and `pupdunk_mystery` options so that they will only be triggered on "pupdunk AND hard/mystery".