/**
 * The best way to understand what is going on is to review the `find` module in monaco
 * https://github.com/Microsoft/vscode/tree/385412e89f610aaa5dc7d6a3727f45e048e37c7e/src/vs/editor/contrib/find
 */
/** Some types */
type Editor = monaco.editor.ICommonCodeEditor;
type CommonFindController = any;
type FindStartFocusAction = any;
type FindModelBoundToEditorModel = any;

declare global {
    module monaco {
        module editor {
            interface ICommonCodeEditor {
                _findController: CommonFindController;
            }
        }
    }
}

/**
 * Mostly providing a typed API on top of `search`
 */
export let commands = {
    search: (cm: Editor, query: FindOptions) => startSearch(cm, query),
    hideSearch: (cm: Editor) => hideSearch(cm),
    findNext: (cm: Editor, query: FindOptions) => findNextIfNotAlreadyDoing(cm, query),
    findPrevious: (cm: Editor, query: FindOptions) => findPreviousIfNotAlreadyDoing(cm, query),
    replaceNext: (cm: Editor, newText: string) => simpleReplaceNext(cm, newText),
    replacePrevious: (cm: Editor, newText: string) => simpleReplacePrevious(cm, newText),
    replaceAll: (cm: Editor, newText: string) => simpleReplaceAll(cm, newText),
}

const startSearch = (editor: Editor, query: FindOptions) => {
    const ctrl = hackyGetSearchCtrl(editor);
    const state = ctrl.getState();
    if (!state.isRevealed) {
        ctrl.start({
            forceRevealReplace: true,
            seedSearchStringFromSelection: false,
            shouldFocus: 0, /* FindStartFocusAction.NoFocusChange */
            shouldAnimate: false,
        });
    }
    const {
        query: searchString,
        isRegex,
        isCaseSensitive,
        isFullWord
    } = query;
    ctrl.setSearchString(searchString);
    state.change({
        isRegex: isRegex,
        matchCase: isCaseSensitive,
        wholeWord: isFullWord
    });
};
const hideSearch = (editor: Editor) => {
    const ctrl = hackyGetSearchCtrl(editor);
    ctrl.closeFindWidget();
};
const findNextIfNotAlreadyDoing = (editor: Editor, query: FindOptions) => {
    const ctrl = hackyGetSearchCtrl(editor);
    if (!ctrl.getState().isRevealed) {
        startSearch(editor, query);
    }
    else {
        ctrl.moveToNextMatch();
    }
}
const findPreviousIfNotAlreadyDoing = (editor: Editor, query: FindOptions) => {
    const ctrl = hackyGetSearchCtrl(editor);
    if (!ctrl.getState().isRevealed) {
        startSearch(editor, query);
    }
    else {
        ctrl.moveToPrevMatch();
    }
};
const simpleReplaceNext = (editor: Editor, newText: string) => {
    const ctrl = hackyGetSearchCtrl(editor);

    // Set new text
    hackySetReplaceText(ctrl, newText);

    // trigger the replace action
    ctrl.replace();
};
const simpleReplacePrevious = (editor: Editor, newText: string) => {
    const ctrl = hackyGetSearchCtrl(editor);

    // Set new text
    hackySetReplaceText(ctrl, newText);

    // trigger the replace all
    hackyReplacePrevious(editor, ctrl, newText);
};
const simpleReplaceAll = (editor: Editor, newText: string) => {
    const ctrl = hackyGetSearchCtrl(editor);

    // Set new text
    hackySetReplaceText(ctrl, newText);

    // trigger the replace all
    ctrl.replaceAll();
};


/**
 * Our interactions with monaco
 */
const hackyGetSearchCtrl = (editor: Editor) => {
    /**
     * HACK
     * https://github.com/Microsoft/vscode/blob/814f92341aa9d3f772b17bf6d46a4e04f2c96959/src/vs/editor/contrib/find/common/findController.ts#L52-L54
     */
    return editor.getContribution('editor.contrib.findController') as any as {
        replace(): void;
        replaceAll(): void;
        getState(): {
            /**
             * https://github.com/Microsoft/vscode/blob/755d45a10785bf5008f27e10a8d607c4443dbf0c/src/vs/editor/contrib/find/common/findState.ts#L49
             */
            isRevealed: boolean,
            change(newState: {
                matchCase: boolean,
                isRegex: boolean,
                wholeWord: boolean,
            }): void,
        },
        start(findStartOptions: {
            forceRevealReplace: boolean;
            seedSearchStringFromSelection: boolean;
            shouldFocus: FindStartFocusAction;
            shouldAnimate: boolean;
        }): void,
        setSearchString(str: string): void,
        closeFindWidget(): void,
        moveToNextMatch(): boolean,
        moveToPrevMatch(): boolean,
    };
};
const hackySetReplaceText = (ctrl: CommonFindController, newText: string) => {
    // HACK to inject at new text:
    (ctrl.getState() as any)._replaceString = newText;
}
const hackyReplacePrevious = (editor: Editor, ctrl: CommonFindController, newText: string) => {
    // If it is on a match it should just replace. Othewise it should go the the previous match

    // HACK: get the model
    const model: FindModelBoundToEditorModel = (ctrl as any)._model;
    // HACK: the following is pretty much a duplicate of `replace` from model
    // HACK: we made public a few `model` functions
    // But for actions we delegate to `ctrl` ;)
    if (!model._hasMatches()) {
        return;
    }
    let selection = editor.getSelection();
    let selectionText = editor.getModel().getValueInRange(selection);
    if (model._rangeIsMatch(selection)) {
        // selection sits on a find match => replace it!
        ctrl.replace();
        ctrl.moveToPrevMatch();
    } else {
        ctrl.moveToPrevMatch();
    }
}