How does the poem "to see the sun, for all his glory, Being Buried in the Coming Night" express the author's mood?

"to see the sun, for all his glory, Buried in the Coming Night" depicts such a picture: the evening sun is reflected, the sunset glow is all over the sky, the mountains are rouge, and the weather is myriad. The poet integrated the feeling of the decline of the times, the pain of the destruction of his home country and the sadness of his later years into the scenery in the sunset. Infinitely Good is a warm praise for the setting sun. However, the word "Gang" turned into deep sorrow. This is a sigh of the poet's inability to retain good things. These two sentences are profound philosophical sayings, which imply that the scenery is so enchanting because it is infinitely beautiful near dusk. This lamentation, which is close to the epigram, is very profound. Some people think that the sunset is a sigh of old age and poverty. Some people think that this is a positive optimism, because poets love life and are persistent in the world. In fact, it is not only a natural scene in the sunset, but also a sigh of the times. Li Shangyin, a poet, foresaw a serious social crisis through the prosperity of the Tang Dynasty empire and expressed his inner helplessness. The profound philosophical implications contained in these two poems have been widely quoted by later generations and used for reference by all aspects of human society; It also extends, sublimates and even does the opposite, turning negative into positive, turning decadent into magic and generating new meanings. Therefore, it has extremely high aesthetic value and ideological value.