1 files changed, 149 insertions, 0 deletions
diff --git a/app/assets/javascripts/pipeline_wizard/components/step.vue b/app/assets/javascripts/pipeline_wizard/components/step.vue
new file mode 100644
index 00000000000..c6f793e4cc5
--- /dev/null
+++ b/app/assets/javascripts/pipeline_wizard/components/step.vue
@@ -0,0 +1,149 @@
+<script>
+import { GlAlert } from '@gitlab/ui';
+import { isNode, isDocument, parseDocument, Document } from 'yaml';
+import { merge } from '~/lib/utils/yaml';
+import { s__ } from '~/locale';
+import { logError } from '~/lib/logger';
+import InputWrapper from './input.vue';
+import StepNav from './step_nav.vue';
+
+export default {
+  name: 'PipelineWizardStep',
+  i18n: {
+    errors: {
+      cloneErrorUserMessage: s__(
+        'PipelineWizard|There was an unexpected error trying to set up the template. The error has been logged.',
+      ),
+    },
+  },
+  components: {
+    StepNav,
+    InputWrapper,
+    GlAlert,
+  },
+  props: {
+    // As the inputs prop we expect to receive an array of instructions
+    // on how to display the input fields that will be used to obtain the
+    // user's input. Each input instruction needs a target prop, specifying
+    // the placeholder in the template that will be replaced by the user's
+    // input. The selected widget may require additional validation for the
+    // input object.
+    inputs: {
+      type: Array,
+      required: true,
+      validator: (value) =>
+        value.every((i) => {
+          return i?.target && i?.widget;
+        }),
+    },
+    template: {
+      type: null,
+      required: true,
+      validator: (v) => isNode(v),
+    },
+    hasPreviousStep: {
+      type: Boolean,
+      required: false,
+      default: false,
+    },
+    compiled: {
+      type: Object,
+      required: true,
+      validator: (v) => isDocument(v),
+    },
+  },
+  data() {
+    return {
+      wasCompiled: false,
+      validate: false,
+      inputValidStates: Array(this.inputs.length).fill(null),
+      error: null,
+    };
+  },
+  computed: {
+    inputValidStatesThatAreNotNull() {
+      return this.inputValidStates?.filter((s) => s !== null);
+    },
+    areAllInputValidStatesNull() {
+      return !this.inputValidStatesThatAreNotNull?.length;
+    },
+    isValid() {
+      return this.areAllInputValidStatesNull || this.inputValidStatesThatAreNotNull.every((s) => s);
+    },
+  },
+  methods: {
+    forceClone(yamlNode) {
+      try {
+        // document.clone() will only clone the root document object,
+        // but the references to the child nodes inside will be retained.
+        // So in order to ensure a full clone, we need to stringify
+        // and parse until there's a better implementation in the
+        // yaml package.
+        return parseDocument(new Document(yamlNode).toString());
+      } catch (e) {
+        // eslint-disable-next-line @gitlab/require-i18n-strings
+        logError('An unexpected error occurred while trying to clone a template', e);
+        this.error = this.$options.i18n.errors.cloneErrorUserMessage;
+        return null;
+      }
+    },
+    compile() {
+      if (this.wasCompiled) return;
+      // NOTE: This modifies this.compiled without triggering reactivity.
+      // this is done on purpose, see
+      // https://gitlab.com/gitlab-org/gitlab/-/merge_requests/81412#note_862972703
+      // for more information
+      merge(this.compiled, this.forceClone(this.template));
+      this.wasCompiled = true;
+    },
+    onUpdate(c) {
+      this.$emit('update:compiled', c);
+    },
+    onPrevClick() {
+      this.$emit('back');
+    },
+    async onNextClick() {
+      this.validate = true;
+      await this.$nextTick();
+      if (this.isValid) {
+        this.$emit('next');
+      }
+    },
+    onInputValidationStateChange(inputId, value) {
+      this.$set(this.inputValidStates, inputId, value);
+    },
+    onHighlight(path) {
+      this.$emit('update:highlight', path);
+    },
+  },
+};
+</script>
+<template>
+  <div>
+    <gl-alert v-if="error" class="gl-mb-4" variant="danger">
+      {{ error }}
+    </gl-alert>
+    <input-wrapper
+      v-for="(input, i) in inputs"
+      :key="input.target"
+      :compiled="compiled"
+      :target="input.target"
+      :template="template"
+      :validate="validate"
+      :widget="input.widget"
+      class="gl-mb-2"
+      v-bind="input"
+      @highlight="onHighlight"
+      @update:valid="(validationState) => onInputValidationStateChange(i, validationState)"
+      @update:compiled="onUpdate"
+      @beforeUpdate:compiled.once="compile"
+    />
+    <step-nav
+      :next-button-enabled="isValid"
+      :show-back-button="hasPreviousStep"
+      show-next-button
+      @back="onPrevClick"
+      @next="onNextClick"
+    />
+  </div>
+</template>