const trainingList = {
    namespaced: true,

    state: {
        index: 0, // 当前选择实训索引
        trainingList: [] // 实训初始列表
    },
    getters: {
        trainingList: (state) => {
            return state.trainingList;
        },
        prevTraining: (state) => () => {
            if (state.trainingList && state.trainingList.length > 0) {
                state.index = state.index - 1;
                if (state.index >= 0) {
                    return state.trainingList[state.index];
                }
            }
        },
        nextTraining: (state) => () => {
            if (state.trainingList && state.trainingList.length > 0) {
                state.index = state.index + 1;
                if (state.index < state.trainingList.length) {
                    return state.trainingList[state.index];
                }
            }
        }
    },
    mutations: {
        setIndex: (state, index) => {
            state.index = index;
        },
        setTrainingList: (state, trainingList) => {
            if (trainingList && trainingList.length) {
                state.trainingList = trainingList;
            } else {
                state.trainingList = [];
            }
        }
    },
    actions: {
        setIndex({ commit }, index) {
            commit('setIndex', index);
        },
        setIndexByTrainingObj({ commit, state }, trainingId) {
            let index = 0;
            if (state.trainingList && state.trainingList.length) {
                state.trainingList.forEach((elem, i) => {
                    if (elem.id === trainingId) {
                        index = i;
                    }
                });
            }
            commit('setIndex', index);
        },
        setTrainingList({ commit }, trainingList) {
            commit('setTrainingList', trainingList);
        },
        clearTrainingList({ commit }) {
            commit('setTrainingList', []);
            commit('setIndex', 0);
        }
    }
};

export default trainingList;