import os
def get_recent_images(dir_name, page_index, step, image_index):
    #print(image_index)
    page_index = int(page_index)
    f_list = os.listdir(dir_name)
    file_list = []
    for file in f_list:
        if file[-4:] == ".txt":
            continue
        file_list.append(file)    
    file_list = sorted(file_list, key=lambda file: -os.path.getctime(os.path.join(dir_name, file)))
    num = 48
    max_page_index = len(file_list) // num + 1    
    page_index = max_page_index if page_index == -1 else page_index + step
    page_index = 1 if page_index < 1 else page_index    
    page_index = max_page_index if page_index > max_page_index else page_index
    idx_frm = (page_index - 1) * num
    file_list = file_list[idx_frm:idx_frm + num]
    #print(f"Loading history page {page_index}")    
    image_index = int(image_index)
    if image_index < 0 or image_index > len(file_list)  - 1:
        current_file = None 
        hide_image = None
    else:
        current_file =  file_list[int(image_index)]
        hide_image = os.path.join(dir_name, current_file)
    return [os.path.join(dir_name, file) for file in file_list], page_index, file_list, current_file, hide_image
def first_page_click(dir_name, page_index, image_index, tabname):
    return get_recent_images(dir_name, 1, 0, image_index)
def end_page_click(dir_name, page_index, image_index, tabname):
    return get_recent_images(dir_name, -1, 0, image_index)
def prev_page_click(dir_name, page_index, image_index, tabname):
    return get_recent_images(dir_name, page_index, -1, image_index)
def next_page_click(dir_name, page_index, image_index, tabname):    
    return get_recent_images(dir_name, page_index, 1, image_index)
def page_index_change(dir_name, page_index, image_index, tabname):    
    return get_recent_images(dir_name, page_index, 0, image_index)

def show_image_info(num, image_path, filenames):
    #print("set img",num)
    file = filenames[int(num)]
    return file, num, os.path.join(image_path, file)
def delete_image(tabname, dir_name, name, page_index, filenames, image_index):
    #print("filename", name)
    path = os.path.join(dir_name, name)           
    if os.path.exists(path):
        print(f"Delete file {path}")
        os.remove(path)    
        new_file_list = []
        for f in filenames:
            if f == name:
                continue
            new_file_list.append(f)
    else:
        print(f"Not exists file {path}")
        new_file_list = filenames
    return page_index, new_file_list

def show_images_history(gr, opts, tabname, run_pnginfo, switch_dict):
        if tabname == "txt2img":
            dir_name = opts.outdir_txt2img_samples
        elif tabname == "img2img":
            dir_name = opts.outdir_img2img_samples
        elif tabname == "extras":
            dir_name = opts.outdir_extras_samples
        with gr.Row():    
                renew_page = gr.Button('Renew', elem_id=tabname + "_images_history_renew_page") 
                first_page = gr.Button('First', elem_id=tabname + "_images_history_first_page")
                prev_page = gr.Button('Prev') 
                page_index = gr.Number(value=1, label="Page Index")
                next_page = gr.Button('Next', elem_id=tabname + "_images_history_next_page") 
                end_page = gr.Button('End')    
        with gr.Row(elem_id=tabname + "_images_history"):            
            with gr.Row():     
                with gr.Column():
                    history_gallery = gr.Gallery(show_label=False).style(grid=6)
                with gr.Column():     
                    with gr.Row():          
                        delete = gr.Button('Delete')
                        pnginfo_send_to_txt2img = gr.Button('Send to txt2img')
                        pnginfo_send_to_img2img = gr.Button('Send to img2img')
                    with gr.Row():
                        with gr.Column():
                            img_file_info = gr.Textbox(label="Generate Info")
                            img_file_name = gr.Textbox(label="File Name")    
                    with gr.Row():    
                            # hiden items
                            img_path = gr.Textbox(dir_name, visible=False)                
                            tabname_box = gr.Textbox(tabname, visible=False)    
                            image_index = gr.Textbox(value=-1, visible=False)                        
                            set_index = gr.Button('set_index',  elem_id=tabname + "_images_history_set_index", visible=False)
                            filenames = gr.State()
                            hide_image = gr.Image(visible=False, type="pil")
                            info1 = gr.Textbox(visible=False)
                            info2 = gr.Textbox(visible=False)

                
        # turn pages
        gallery_inputs = [img_path, page_index, image_index, tabname_box]
        gallery_outputs = [history_gallery, page_index, filenames, img_file_name, hide_image]

        first_page.click(first_page_click, _js="images_history_turnpage", inputs=gallery_inputs, outputs=gallery_outputs)
        next_page.click(next_page_click, _js="images_history_turnpage", inputs=gallery_inputs, outputs=gallery_outputs)
        prev_page.click(prev_page_click, _js="images_history_turnpage", inputs=gallery_inputs, outputs=gallery_outputs)        
        end_page.click(end_page_click, _js="images_history_turnpage", inputs=gallery_inputs, outputs=gallery_outputs)
        page_index.submit(page_index_change, _js="images_history_turnpage", inputs=gallery_inputs, outputs=gallery_outputs)
        renew_page.click(page_index_change, _js="images_history_turnpage", inputs=gallery_inputs, outputs=gallery_outputs)
        #page_index.change(page_index_change, inputs=[tabname_box, img_path,  page_index], outputs=[history_gallery, page_index])

        #other funcitons
        set_index.click(show_image_info, _js="images_history_get_current_img", inputs=[tabname_box,  img_path, filenames], outputs=[img_file_name, image_index, hide_image])
        delete.click(delete_image,_js="images_history_delete", inputs=[tabname_box, img_path, img_file_name, page_index, filenames, image_index], outputs=[page_index, filenames]) 
        hide_image.change(fn=run_pnginfo, inputs=[hide_image], outputs=[info1, img_file_info, info2])
        switch_dict["fn"](pnginfo_send_to_txt2img, switch_dict["t2i"], img_file_info, 'switch_to_txt2img')
        switch_dict["fn"](pnginfo_send_to_img2img, switch_dict["i2i"], img_file_info, 'switch_to_img2img_img2img')
    
        
def create_history_tabs(gr, opts, run_pnginfo, switch_dict):
    with gr.Blocks(analytics_enabled=False) as images_history:
        with gr.Tabs() as tabs:            
            with gr.Tab("txt2img history"):
                with gr.Blocks(analytics_enabled=False) as images_history_txt2img:   
                    show_images_history(gr, opts, "txt2img", run_pnginfo, switch_dict) 
            with gr.Tab("img2img history"):
                with gr.Blocks(analytics_enabled=False) as images_history_img2img:
                    show_images_history(gr, opts, "img2img", run_pnginfo, switch_dict)
            with gr.Tab("extras history"):
                with gr.Blocks(analytics_enabled=False) as images_history_img2img:
                    show_images_history(gr, opts, "extras", run_pnginfo, switch_dict)
    return images_history