const state = {
  visitedViews: [],
  cachedViews: [],
  iframeViews: []
};

const mutations = {
  ADD_IFRAME_VIEW: (state, view) => {
    if (state.iframeViews.some((v) => v.path === view.path)) return;
    state.iframeViews.push(
      Object.assign({}, view, {
        title: view.meta.title || 'no-name'
      })
    );
  },
  ADD_VISITED_VIEW: (state, view) => {
    if (state.visitedViews.some((v) => v.path === view.path)) return;
    state.visitedViews.push(
      Object.assign({}, view, {
        title: view.meta.title || 'no-name'
      })
    );
  },
  ADD_CACHED_VIEW: (state, view) => {
    if (state.cachedViews.includes(view.name)) return;
    if (view.meta && !view.meta.noCache) {
      state.cachedViews.push(view.name);
    }
  },
  DEL_VISITED_VIEW: (state, view) => {
    for (const [i, v] of state.visitedViews.entries()) {
      if (v.path === view.path) {
        state.visitedViews.splice(i, 1);
        break;
      }
    }
    state.iframeViews = state.iframeViews.filter(
      (item) => item.path !== view.path
    );
  },
  DEL_IFRAME_VIEW: (state, view) => {
    state.iframeViews = state.iframeViews.filter(
      (item) => item.path !== view.path
    );
  },
  DEL_CACHED_VIEW: (state, view) => {
    const index = state.cachedViews.indexOf(view.name);
    index > -1 && state.cachedViews.splice(index, 1);
  },

  DEL_OTHERS_VISITED_VIEWS: (state, view) => {
    state.visitedViews = state.visitedViews.filter((v) => {
      return v.meta.affix || v.path === view.path;
    });
    state.iframeViews = state.iframeViews.filter(
      (item) => item.path === view.path
    );
  },
  DEL_OTHERS_CACHED_VIEWS: (state, view) => {
    const index = state.cachedViews.indexOf(view.name);
    if (index > -1) {
      state.cachedViews = state.cachedViews.slice(index, index + 1);
    } else {
      state.cachedViews = [];
    }
  },
  DEL_ALL_VISITED_VIEWS: (state) => {
    // keep affix tags
    const affixTags = state.visitedViews.filter((tag) => tag.meta.affix);
    state.visitedViews = affixTags;
    state.iframeViews = [];
  },
  DEL_ALL_CACHED_VIEWS: (state) => {
    state.cachedViews = [];
  },
  UPDATE_VISITED_VIEW: (state, view) => {
    for (let v of state.visitedViews) {
      if (v.path === view.path) {
        v = Object.assign(v, view);
        break;
      }
    }
  },
  DEL_RIGHT_VIEWS: (state, view) => {
    const index = state.visitedViews.findIndex((v) => v.path === view.path);
    if (index === -1) {
      return;
    }
    state.visitedViews = state.visitedViews.filter((item, idx) => {
      if (idx <= index || (item.meta && item.meta.affix)) {
        return true;
      }
      const i = state.cachedViews.indexOf(item.name);
      if (i > -1) {
        state.cachedViews.splice(i, 1);
      }
      if (item.meta.link) {
        const fi = state.iframeViews.findIndex((v) => v.path === item.path);
        state.iframeViews.splice(fi, 1);
      }
      return false;
    });
  },
  DEL_LEFT_VIEWS: (state, view) => {
    const index = state.visitedViews.findIndex((v) => v.path === view.path);
    if (index === -1) {
      return;
    }
    state.visitedViews = state.visitedViews.filter((item, idx) => {
      if (idx >= index || (item.meta && item.meta.affix)) {
        return true;
      }
      const i = state.cachedViews.indexOf(item.name);
      if (i > -1) {
        state.cachedViews.splice(i, 1);
      }
      if (item.meta.link) {
        const fi = state.iframeViews.findIndex((v) => v.path === item.path);
        state.iframeViews.splice(fi, 1);
      }
      return false;
    });
  }
};

const actions = {
  addView({ dispatch }, view) {
    dispatch('addVisitedView', view);
    dispatch('addCachedView', view);
  },
  addIframeView({ commit }, view) {
    commit('ADD_IFRAME_VIEW', view);
  },
  addVisitedView({ commit }, view) {
    commit('ADD_VISITED_VIEW', view);
  },
  addCachedView({ commit }, view) {
    commit('ADD_CACHED_VIEW', view);
  },
  delView({ dispatch, state }, view) {
    return new Promise((resolve) => {
      dispatch('delVisitedView', view);
      dispatch('delCachedView', view);
      resolve({
        visitedViews: [...state.visitedViews],
        cachedViews: [...state.cachedViews]
      });
    });
  },
  delVisitedView({ commit, state }, view) {
    return new Promise((resolve) => {
      commit('DEL_VISITED_VIEW', view);
      resolve([...state.visitedViews]);
    });
  },
  delIframeView({ commit, state }, view) {
    return new Promise((resolve) => {
      commit('DEL_IFRAME_VIEW', view);
      resolve([...state.iframeViews]);
    });
  },
  delCachedView({ commit, state }, view) {
    return new Promise((resolve) => {
      commit('DEL_CACHED_VIEW', view);
      resolve([...state.cachedViews]);
    });
  },
  delOthersViews({ dispatch, state }, view) {
    return new Promise((resolve) => {
      dispatch('delOthersVisitedViews', view);
      dispatch('delOthersCachedViews', view);
      resolve({
        visitedViews: [...state.visitedViews],
        cachedViews: [...state.cachedViews]
      });
    });
  },
  delOthersVisitedViews({ commit, state }, view) {
    return new Promise((resolve) => {
      commit('DEL_OTHERS_VISITED_VIEWS', view);
      resolve([...state.visitedViews]);
    });
  },
  delOthersCachedViews({ commit, state }, view) {
    return new Promise((resolve) => {
      commit('DEL_OTHERS_CACHED_VIEWS', view);
      resolve([...state.cachedViews]);
    });
  },
  delAllViews({ dispatch, state }, view) {
    return new Promise((resolve) => {
      dispatch('delAllVisitedViews', view);
      dispatch('delAllCachedViews', view);
      resolve({
        visitedViews: [...state.visitedViews],
        cachedViews: [...state.cachedViews]
      });
    });
  },
  delAllVisitedViews({ commit, state }) {
    return new Promise((resolve) => {
      commit('DEL_ALL_VISITED_VIEWS');
      resolve([...state.visitedViews]);
    });
  },
  delAllCachedViews({ commit, state }) {
    return new Promise((resolve) => {
      commit('DEL_ALL_CACHED_VIEWS');
      resolve([...state.cachedViews]);
    });
  },
  updateVisitedView({ commit }, view) {
    commit('UPDATE_VISITED_VIEW', view);
  },
  delRightTags({ commit }, view) {
    return new Promise((resolve) => {
      commit('DEL_RIGHT_VIEWS', view);
      resolve([...state.visitedViews]);
    });
  },
  delLeftTags({ commit }, view) {
    return new Promise((resolve) => {
      commit('DEL_LEFT_VIEWS', view);
      resolve([...state.visitedViews]);
    });
  }
};

export default {
  namespaced: true,
  state,
  mutations,
  actions
};
