Refactor JS code

- Use a store base object to manage application state.
- Add a service to handle ajax requests.
- Load code only when needed

10 files changed, 545 insertions, 11 deletions

diff --git a/app/assets/javascripts/dispatcher.js b/app/assets/javascripts/dispatcher.js
index f3ef13ce20e..2c277766d2d 100644
--- a/app/assets/javascripts/dispatcher.js
+++ b/app/assets/javascripts/dispatcher.js
@@ -97,9 +97,6 @@
           new ZenMode();
           new MergedButtons();
           break;
-        case "projects:merge_requests:conflicts":
-          window.mcui = new MergeConflictResolver()
-          break;
         case 'projects:merge_requests:index':
           shortcut_handler = new ShortcutsNavigation();
           Issuable.init();
diff --git a/app/assets/javascripts/merge_conflicts/components/diff_file_editor.js.es6 b/app/assets/javascripts/merge_conflicts/components/diff_file_editor.js.es6
index abdf73febb4..49d30f6e9e8 100644
--- a/app/assets/javascripts/merge_conflicts/components/diff_file_editor.js.es6
+++ b/app/assets/javascripts/merge_conflicts/components/diff_file_editor.js.es6
@@ -1,5 +1,8 @@
 ((global) => {
-  global.diffFileEditor = Vue.extend({
+
+  global.mergeConflicts = global.mergeConflicts || {};
+
+  global.mergeConflicts.diffFileEditor = Vue.extend({
     props: ['file', 'loadFile'],
     template: '#diff-file-editor',
     data() {
diff --git a/app/assets/javascripts/merge_conflicts/merge_conflict_service.js.es6 b/app/assets/javascripts/merge_conflicts/merge_conflict_service.js.es6
new file mode 100644
index 00000000000..da2fb8b1323
--- /dev/null
+++ b/app/assets/javascripts/merge_conflicts/merge_conflict_service.js.es6
@@ -0,0 +1,30 @@
+((global) => {
+  global.mergeConflicts = global.mergeConflicts || {};
+
+  class mergeConflictsService {
+    constructor(options) {
+      this.conflictsPath = options.conflictsPath;
+      this.resolveConflictsPath = options.resolveConflictsPath;
+    }
+
+    fetchConflictsData() {
+      return $.ajax({
+        dataType: 'json',
+        url: this.conflictsPath
+      });
+    }
+
+    submitResolveConflicts(data) {
+      return $.ajax({
+        url: this.resolveConflictsPath,
+        data: JSON.stringify(data),
+        contentType: 'application/json',
+        dataType: 'json',
+        method: 'POST'
+      });
+    }
+  };
+
+  global.mergeConflicts.mergeConflictsService = mergeConflictsService;
+
+})(window.gl || (window.gl = {}));
diff --git a/app/assets/javascripts/merge_conflicts/merge_conflict_store.js.es6 b/app/assets/javascripts/merge_conflicts/merge_conflict_store.js.es6
new file mode 100644
index 00000000000..d35e6d8aed6
--- /dev/null
+++ b/app/assets/javascripts/merge_conflicts/merge_conflict_store.js.es6
@@ -0,0 +1,419 @@
+((global) => {
+  global.mergeConflicts = global.mergeConflicts || {};
+
+  const diffViewType = $.cookie('diff_view');
+  const HEAD_HEADER_TEXT = 'HEAD//our changes';
+  const ORIGIN_HEADER_TEXT = 'origin//their changes';
+  const HEAD_BUTTON_TITLE = 'Use ours';
+  const ORIGIN_BUTTON_TITLE = 'Use theirs';
+  const INTERACTIVE_RESOLVE_MODE = 'interactive';
+  const EDIT_RESOLVE_MODE = 'edit';
+  const DEFAULT_RESOLVE_MODE = INTERACTIVE_RESOLVE_MODE;
+  const VIEW_TYPES = {
+    INLINE: 'inline',
+    PARALLEL: 'parallel'
+  };
+
+  global.mergeConflicts.mergeConflictsStore = {
+    state: {
+      isLoading: true,
+      hasError: false,
+      isSubmitting: false,
+      isParallel: diffViewType === VIEW_TYPES.PARALLEL,
+      diffViewType: diffViewType,
+      conflictsData: {}
+    },
+
+    setConflictsData(data) {
+      this.decorateFiles(data.files);
+      this.setInlineLines(data.files);
+      this.setParallelLines(data.files);
+
+      this.state.conflictsData = {
+        files: data.files,
+        commitMessage: data.commit_message,
+        sourceBranch: data.source_branch,
+        targetBranch: data.target_branch,
+        commitMessage: data.commit_message,
+        shortCommitSha: data.commit_sha.slice(0, 7),
+      };
+    },
+
+    decorateFiles(files) {
+      files.forEach((file) => {
+        file.content = '';
+        file.resolutionData = {};
+        file.promptDiscardConfirmation = false;
+        file.resolveMode = DEFAULT_RESOLVE_MODE;
+      });
+    },
+
+    setInlineLines(files) {
+      files.forEach((file) => {
+        file.iconClass = `fa-${file.blob_icon}`;
+        file.blobPath = file.blob_path;
+        file.filePath = this.getFilePath(file);
+        file.inlineLines = [];
+
+        file.sections.forEach((section) => {
+          let currentLineType = 'new';
+          const { conflict, lines, id } = section;
+
+          if (conflict) {
+            file.inlineLines.push(this.getHeadHeaderLine(id));
+          }
+
+          lines.forEach((line) => {
+            const { type } = line;
+
+            if ((type === 'new' || type === 'old') && currentLineType !== type) {
+              currentLineType = type;
+              file.inlineLines.push({ lineType: 'emptyLine', richText: '' });
+            }
+
+            this.decorateLineForInlineView(line, id, conflict);
+            file.inlineLines.push(line);
+          })
+
+          if (conflict) {
+            file.inlineLines.push(this.getOriginHeaderLine(id));
+          }
+        });
+      });
+    },
+
+    setParallelLines(files) {
+      files.forEach((file) => {
+        file.filePath  = this.getFilePath(file);
+        file.iconClass = `fa-${file.blob_icon}`;
+        file.blobPath  = file.blob_path;
+        file.parallelLines = [];
+        const linesObj = { left: [], right: [] };
+
+        file.sections.forEach((section) => {
+          const { conflict, lines, id } = section;
+
+          if (conflict) {
+            linesObj.left.push(this.getOriginHeaderLine(id));
+            linesObj.right.push(this.getHeadHeaderLine(id));
+          }
+
+          lines.forEach((line) => {
+            const { type } = line;
+
+            if (conflict) {
+              if (type === 'old') {
+                linesObj.left.push(this.getLineForParallelView(line, id, 'conflict'));
+              }
+              else if (type === 'new') {
+                linesObj.right.push(this.getLineForParallelView(line, id, 'conflict', true));
+              }
+            }
+            else {
+              const lineType = type || 'context';
+
+              linesObj.left.push (this.getLineForParallelView(line, id, lineType));
+              linesObj.right.push(this.getLineForParallelView(line, id, lineType, true));
+            }
+          });
+
+          this.checkLineLengths(linesObj);
+        });
+
+        for (let i = 0, len = linesObj.left.length; i < len; i++) {
+          file.parallelLines.push([
+            linesObj.right[i],
+            linesObj.left[i]
+          ]);
+        }
+
+        return file;
+      });
+    },
+
+    setLoadingState(state) {
+      this.state.isLoading = state;
+    },
+
+    setErrorState(state) {
+      this.state.hasError = state;
+    },
+
+    setFailedRequest(message) {
+      console.log('setFailedRequest');
+      this.state.hasError = true;
+      this.state.conflictsData.errorMessage = message;
+    },
+
+    getConflictsCount() {
+      if (!this.state.conflictsData.files) {
+        return 0;
+      }
+
+      const files = this.state.conflictsData.files;
+      let count = 0;
+
+      files.forEach((file) => {
+        file.sections.forEach((section) => {
+          if (section.conflict) {
+            count++;
+          }
+        });
+      });
+
+      return count;
+    },
+
+    getConflictsCountText() {
+      const count = this.getConflictsCount();
+      const text = count ? 'conflicts' : 'conflict';
+
+      return `${count} ${text}`;
+    },
+
+    setViewType(viewType) {
+      this.state.diffView   = viewType;
+      this.state.isParallel = viewType === VIEW_TYPES.PARALLEL;
+
+      $.cookie('diff_view', viewType, {
+        path: gon.relative_url_root || '/'
+      });
+    },
+
+    getHeadHeaderLine(id) {
+      return {
+        id: id,
+        richText: HEAD_HEADER_TEXT,
+        buttonTitle: HEAD_BUTTON_TITLE,
+        type: 'new',
+        section: 'head',
+        isHeader: true,
+        isHead: true,
+        isSelected: false,
+        isUnselected: false
+      }
+    },
+
+    decorateLineForInlineView(line, id, conflict) {
+      const { type } = line;
+      line.id = id;
+      line.hasConflict = conflict;
+      line.isHead = type === 'new';
+      line.isOrigin = type === 'old';
+      line.hasMatch = type === 'match';
+      line.richText = line.rich_text;
+      line.isSelected = false;
+      line.isUnselected = false;
+    },
+
+    getLineForParallelView(line, id, lineType, isHead) {
+      const { old_line, new_line, rich_text } = line;
+      const hasConflict = lineType === 'conflict';
+
+      return {
+        id,
+        lineType,
+        hasConflict,
+        isHead: hasConflict && isHead,
+        isOrigin: hasConflict && !isHead,
+        hasMatch: lineType === 'match',
+        lineNumber: isHead ? new_line : old_line,
+        section: isHead ? 'head' : 'origin',
+        richText: rich_text,
+        isSelected: false,
+        isUnselected: false
+      }
+    },
+
+    getOriginHeaderLine(id) {
+      return {
+        id: id,
+        richText: ORIGIN_HEADER_TEXT,
+        buttonTitle: ORIGIN_BUTTON_TITLE,
+        type: 'old',
+        section: 'origin',
+        isHeader: true,
+        isOrigin: true,
+        isSelected: false,
+        isUnselected: false
+      }
+    },
+
+    getFilePath(file) {
+      const { old_path, new_path } = file;
+      return old_path === new_path ? new_path : `${old_path} → ${new_path}`;
+    },
+
+    checkLineLengths(linesObj) {
+      let { left, right } = linesObj;
+
+      if (left.length !== right.length) {
+        if (left.length > right.length) {
+          const diff = left.length - right.length;
+          for (let i = 0; i < diff; i++) {
+            right.push({ lineType: 'emptyLine', richText: '' });
+          }
+        }
+        else {
+          const diff = right.length - left.length;
+          for (let i = 0; i < diff; i++) {
+            left.push({ lineType: 'emptyLine', richText: '' });
+          }
+        }
+      }
+    },
+
+    setPromptConfirmationState(file, state) {
+      file.promptDiscardConfirmation = state;
+    },
+
+    setFileResolveMode(file, mode) {
+      // Restore Interactive mode when switching to Edit mode
+      if (mode === EDIT_RESOLVE_MODE) {
+        file.resolutionData = {};
+
+        this.restoreFileLinesState(file);
+      }
+
+      file.resolveMode = mode;
+    },
+
+    restoreFileLinesState(file) {
+      file.inlineLines.forEach((line) => {
+        if (line.hasConflict || line.isHeader) {
+          line.isSelected = false;
+          line.isUnselected = false;
+        }
+      });
+
+      file.parallelLines.forEach((lines) => {
+        const left         = lines[0];
+        const right        = lines[1];
+        const isLeftMatch  = left.hasConflict || left.isHeader;
+        const isRightMatch = right.hasConflict || right.isHeader;
+
+        if (isLeftMatch || isRightMatch) {
+          left.isSelected = false;
+          left.isUnselected = false;
+          right.isSelected = false;
+          right.isUnselected = false;
+        }
+      });
+    },
+
+    isReadyToCommit() {
+      const files = this.state.conflictsData.files;
+      const hasCommitMessage = $.trim(this.state.conflictsData.commitMessage).length;
+      let unresolved = 0;
+
+      for (let i = 0, l = files.length; i < l; i++) {
+        let file = files[i];
+
+        if (file.resolveMode === INTERACTIVE_RESOLVE_MODE) {
+          let numberConflicts = 0;
+          let resolvedConflicts = Object.keys(file.resolutionData).length
+
+          for (let j = 0, k = file.sections.length; j < k; j++) {
+            if (file.sections[j].conflict) {
+              numberConflicts++;
+            }
+          }
+
+          if (resolvedConflicts !== numberConflicts) {
+            unresolved++;
+          }
+        } else if (file.resolveMode === EDIT_RESOLVE_MODE) {
+          // Unlikely to happen since switching to Edit mode saves content automatically.
+          // Checking anyway in case the save strategy changes in the future
+          if (!file.content) {
+            unresolved++;
+            continue;
+          }
+        }
+      }
+
+      return !this.state.isSubmitting && hasCommitMessage && !unresolved;
+    },
+
+    getCommitButtonText() {
+      const initial = 'Commit conflict resolution';
+      const inProgress = 'Committing...';
+
+      return this.state ? this.state.isSubmitting ? inProgress : initial : initial;
+    },
+
+    getCommitData() {
+      let commitData = {};
+
+      commitData = {
+        commit_message: this.state.conflictsData.commitMessage,
+        files: []
+      };
+
+      this.state.conflictsData.files.forEach((file) => {
+        let addFile;
+
+        addFile = {
+          old_path: file.old_path,
+          new_path: file.new_path
+        };
+
+        // Submit only one data for type of editing
+        if (file.resolveMode === INTERACTIVE_RESOLVE_MODE) {
+          addFile.sections = file.resolutionData;
+        } else if (file.resolveMode === EDIT_RESOLVE_MODE) {
+          addFile.content = file.content;
+        }
+
+        commitData.files.push(addFile);
+      });
+
+      return commitData;
+    },
+
+    handleSelected(file, sectionId, selection) {
+      Vue.set(file.resolutionData, sectionId, selection);
+
+      this.state.conflictsData.files.forEach((file) => {
+        file.inlineLines.forEach((line) => {
+          if (line.id === sectionId && (line.hasConflict || line.isHeader)) {
+            this.markLine(line, selection);
+          }
+        });
+
+        file.parallelLines.forEach((lines) => {
+          const left         = lines[0];
+          const right        = lines[1];
+          const hasSameId    = right.id === sectionId || left.id === sectionId;
+          const isLeftMatch  = left.hasConflict || left.isHeader;
+          const isRightMatch = right.hasConflict || right.isHeader;
+
+          if (hasSameId && (isLeftMatch || isRightMatch)) {
+            this.markLine(left, selection);
+            this.markLine(right, selection);
+          }
+        })
+      });
+    },
+
+    markLine(line, selection) {
+      if (selection === 'head' && line.isHead) {
+        line.isSelected   = true;
+        line.isUnselected = false;
+      }
+      else if (selection === 'origin' && line.isOrigin) {
+        line.isSelected   = true;
+        line.isUnselected = false;
+      }
+      else {
+        line.isSelected   = false;
+        line.isUnselected = true;
+      }
+    },
+
+    setSubmitState(state) {
+      this.state.isSubmitting = state;
+    }
+  };
+
+})(window.gl || (window.gl = {}));
diff --git a/app/assets/javascripts/merge_conflicts/merge_conflicts_bundle.js.es6 b/app/assets/javascripts/merge_conflicts/merge_conflicts_bundle.js.es6
new file mode 100644
index 00000000000..b5123e22f7a
--- /dev/null
+++ b/app/assets/javascripts/merge_conflicts/merge_conflicts_bundle.js.es6
@@ -0,0 +1,84 @@
+//= require vue
+//= require ./merge_conflict_store
+//= require ./merge_conflict_service
+//= require ./components/diff_file_editor
+
+$(() => {
+  const INTERACTIVE_RESOLVE_MODE = 'interactive';
+  const $conflicts = $(document.getElementById('conflicts'));
+  const mergeConflictsStore = gl.mergeConflicts.mergeConflictsStore;
+  const mergeConflictsService = new gl.mergeConflicts.mergeConflictsService({
+    conflictsPath: $conflicts.data('conflictsPath'),
+    resolveConflictsPath: $conflicts.data('resolveConflictsPath')
+  });
+
+  gl.MergeConflictsResolverApp   = new Vue({
+    el: '#conflicts',
+    data: mergeConflictsStore.state,
+    components: {
+      'diff-file-editor': gl.mergeConflicts.diffFileEditor
+    },
+    computed: {
+      conflictsCountText() { return mergeConflictsStore.getConflictsCountText() },
+      readyToCommit() { return mergeConflictsStore.isReadyToCommit() },
+      commitButtonText() { return mergeConflictsStore.getCommitButtonText() }
+    },
+    created() {
+      mergeConflictsService
+        .fetchConflictsData()
+        .done((data) => {
+          if (data.type === 'error') {
+            mergeConflictsStore.setFailedRequest(data.message);
+          } else {
+            mergeConflictsStore.setConflictsData(data);
+          }
+        })
+        .error(() => {
+          mergeConflictsStore.setFailedRequest();
+        })
+        .always(() => {
+          mergeConflictsStore.setLoadingState(false);
+
+          this.$nextTick(() => {
+            $conflicts.find('.js-syntax-highlight').syntaxHighlight();
+          });
+        });
+    },
+    methods: {
+      handleSelected(file, sectionId, selection) {
+        mergeConflictsStore.handleSelected(file, sectionId, selection);
+      },
+      handleViewTypeChange(viewType) {
+        mergeConflictsStore.setViewType(viewType);
+      },
+      onClickResolveModeButton(file, mode) {
+        if (mode === INTERACTIVE_RESOLVE_MODE && file.resolveEditChanged) {
+          mergeConflictsStore.setPromptConfirmationState(file, true);
+          return;
+        }
+
+        mergeConflictsStore.setFileResolveMode(file, mode);
+      },
+      acceptDiscardConfirmation(file) {
+        mergeConflictsStore.setPromptConfirmationState(file, false);
+        mergeConflictsStore.setFileResolveMode(file, INTERACTIVE_RESOLVE_MODE);
+      },
+      cancelDiscardConfirmation(file) {
+        mergeConflictsStore.setPromptConfirmationState(file, false);
+      },
+      commit() {
+        mergeConflictsStore.setSubmitState(true);
+
+        mergeConflictsService
+          .submitResolveConflicts(mergeConflictsStore.getCommitData())
+          .done((data) => {
+            window.location.href = data.redirect_to;
+          })
+          .error(() => {
+            mergeConflictsStore.setSubmitState(false);
+            new Flash('Failed to save merge conflicts resolutions. Please try again!');
+          });
+      }
+    }
+  })
+});
diff --git a/app/views/projects/merge_requests/conflicts.html.haml b/app/views/projects/merge_requests/conflicts.html.haml
index ff641b90b86..997f40c0588 100644
--- a/app/views/projects/merge_requests/conflicts.html.haml
+++ b/app/views/projects/merge_requests/conflicts.html.haml
@@ -7,6 +7,7 @@
 
 - page_title "Merge Conflicts", "#{@merge_request.title} (#{@merge_request.to_reference}", "Merge Requests"
 - content_for :page_specific_javascripts do
+  = page_specific_javascript_tag('merge_conflicts/merge_conflicts_bundle.js')
   = page_specific_javascript_tag('lib/ace.js')
 = render "projects/merge_requests/show/mr_title"
 
@@ -26,8 +27,8 @@
   = render partial: "projects/merge_requests/conflicts/commit_stats"
 
   .files-wrapper{"v-if" => "!isLoading && !hasError"}
-    = render partial: "projects/merge_requests/conflicts/parallel_view", locals: { class_bindings: class_bindings }
     = render partial: "projects/merge_requests/conflicts/inline_view", locals: { class_bindings: class_bindings }
+    = render partial: "projects/merge_requests/conflicts/parallel_view", locals: { class_bindings: class_bindings }
     = render partial: "projects/merge_requests/conflicts/submit_form"
 
 -# Components 
diff --git a/app/views/projects/merge_requests/conflicts/_commit_stats.html.haml b/app/views/projects/merge_requests/conflicts/_commit_stats.html.haml
index 457c467fba9..a3831d5a34e 100644
--- a/app/views/projects/merge_requests/conflicts/_commit_stats.html.haml
+++ b/app/views/projects/merge_requests/conflicts/_commit_stats.html.haml
@@ -13,8 +13,8 @@
   .js-toggle-container
     .commit-stat-summary
       Showing
-      %strong.cred {{conflictsCount}} {{conflictsData.conflictsText}}
+      %strong.cred {{conflictsCountText}}
       between
-      %strong {{conflictsData.source_branch}}
+      %strong {{conflictsData.sourceBranch}}
       and
-      %strong {{conflictsData.target_branch}}
+      %strong {{conflictsData.targetBranch}}
diff --git a/app/views/projects/merge_requests/conflicts/_submit_form.html.haml b/app/views/projects/merge_requests/conflicts/_submit_form.html.haml
index fbb15c307c4..6ffaa9ad4d2 100644
--- a/app/views/projects/merge_requests/conflicts/_submit_form.html.haml
+++ b/app/views/projects/merge_requests/conflicts/_submit_form.html.haml
@@ -6,7 +6,6 @@
       .commit-message-container
         .max-width-marker
         %textarea.form-control.js-commit-message#commit-message{ "v-model" => "conflictsData.commitMessage", "rows" => "5" }
-          {{{conflictsData.commitMessage}}}
   .form-group
     .col-sm-offset-2.col-sm-10
       .row
diff --git a/config/application.rb b/config/application.rb
index 962ffe0708d..8a9c539cb43 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -89,6 +89,7 @@ module Gitlab
     config.assets.precompile << "profile/profile_bundle.js"
     config.assets.precompile << "diff_notes/diff_notes_bundle.js"
     config.assets.precompile << "boards/boards_bundle.js"
+    config.assets.precompile << "merge_conflicts/merge_conflicts_bundle.js"
     config.assets.precompile << "boards/test_utils/simulate_drag.js"
     config.assets.precompile << "blob_edit/blob_edit_bundle.js"
     config.assets.precompile << "snippet/snippet_bundle.js"
diff --git a/spec/features/merge_requests/conflicts_spec.rb b/spec/features/merge_requests/conflicts_spec.rb
index 721360b207e..f2ff000486b 100644
--- a/spec/features/merge_requests/conflicts_spec.rb
+++ b/spec/features/merge_requests/conflicts_spec.rb
@@ -42,13 +42,13 @@ feature 'Merge request conflict resolution', js: true, feature: true do
           within find('.files-wrapper .diff-file.inline-view', text: 'files/ruby/popen.rb') do
             click_button 'Edit inline'
             wait_for_ajax
-            execute_script('ace.edit($(".files-wrapper .diff-file.inline-view pre")[0]).setValue("One morning");');
+            execute_script('ace.edit($(".files-wrapper .diff-file.inline-view pre")[0]).setValue("One morning");')
           end
 
           within find('.files-wrapper .diff-file', text: 'files/ruby/regex.rb') do
             click_button 'Edit inline'
             wait_for_ajax
-            execute_script('ace.edit($(".files-wrapper .diff-file.inline-view pre")[1]).setValue("Gregor Samsa woke from troubled dreams");');
+            execute_script('ace.edit($(".files-wrapper .diff-file.inline-view pre")[1]).setValue("Gregor Samsa woke from troubled dreams");')
           end
 
           click_button 'Commit conflict resolution'