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import Completions from "../Completions";
import CompletionType from "../../shared/CompletionType";
import {
INIT_COMPLETIONS,
SET_COMPLETION_SOURCE,
SET_COMPLETIONS,
COMPLETION_NEXT,
COMPLETION_PREV,
CompletionAction,
} from "./actions";
export interface State {
completionTypes?: CompletionType[];
completionSource: string;
completions: Completions;
select: number;
}
export const defaultState = {
completionTypes: undefined,
completionSource: "",
completions: [],
select: -1,
};
const nextSelection = (state: State): number => {
const length = state.completions
.map((g) => g.items.length)
.reduce((x, y) => x + y, 0);
if (length === 0) {
return -1;
}
if (state.select < 0) {
return 0;
}
if (state.select + 1 < length) {
return state.select + 1;
}
return -1;
};
const prevSelection = (state: State): number => {
if (state.completions.length === 0) {
return -1;
}
const length = state.completions
.map((g) => g.items.length)
.reduce((x, y) => x + y);
if (state.select < 0) {
return length - 1;
}
return state.select - 1;
};
// eslint-disable-next-line max-lines-per-function
export default function reducer(
state: State = defaultState,
action: CompletionAction
): State {
switch (action.type) {
case INIT_COMPLETIONS:
return {
...state,
completionTypes: action.completionTypes,
completions: [],
select: -1,
};
case SET_COMPLETION_SOURCE:
return {
...state,
completionSource: action.completionSource,
select: -1,
};
case SET_COMPLETIONS:
return {
...state,
completions: action.completions,
};
case COMPLETION_NEXT: {
const select = nextSelection(state);
return {
...state,
select: select,
};
}
case COMPLETION_PREV: {
const select = prevSelection(state);
return {
...state,
select: select,
};
}
default:
return state;
}
}
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