import html
import sys
import threading
import traceback
import time

import gradio as gr
from modules import shared, progress

queue_lock = threading.Lock()
queue_lock_condition = threading.Condition(lock=queue_lock)

def wrap_session_call(func):
  def f(request: gr.Request, *args, **kwargs):
    return func(request, *args, **kwargs)
  return f

def wrap_queued_call(func):
    def f(*args, **kwargs):
        with queue_lock:
            res = func(*args, **kwargs)

        return res

    return f


def wrap_gradio_gpu_call(func, extra_outputs=None):
    def f(request: gr.Request, *args, **kwargs):
        user = request.username

        # if the first argument is a string that says "task(...)", it is treated as a job id
        if len(args) > 0 and type(args[0]) == str and args[0][0:5] == "task(" and args[0][-1] == ")":
            id_task = args[0]
            progress.add_task_to_queue(user, id_task)
        else:
            id_task = None

        with queue_lock:
            shared.state.begin()
            progress.start_task(user, id_task)

            try:
                res = func(*args, **kwargs)
            finally:
                progress.finish_task(user, id_task)
                progress.set_last_task_result(user, id_task, res)

            shared.state.end()

        return res

    return wrap_session_call(wrap_gradio_call(f, extra_outputs=extra_outputs, add_stats=True))


def wrap_gradio_call(func, extra_outputs=None, add_stats=False):
    def f(*args, extra_outputs_array=extra_outputs, **kwargs):
        run_memmon = shared.opts.memmon_poll_rate > 0 and not shared.mem_mon.disabled and add_stats
        if run_memmon:
            shared.mem_mon.monitor()
        t = time.perf_counter()

        try:
            res = list(func(*args, **kwargs))
        except Exception as e:
            # When printing out our debug argument list, do not print out more than a MB of text
            max_debug_str_len = 131072 # (1024*1024)/8

            print("Error completing request", file=sys.stderr)
            argStr = f"Arguments: {str(args)} {str(kwargs)}"
            print(argStr[:max_debug_str_len], file=sys.stderr)
            if len(argStr) > max_debug_str_len:
                print(f"(Argument list truncated at {max_debug_str_len}/{len(argStr)} characters)", file=sys.stderr)

            print(traceback.format_exc(), file=sys.stderr)

            shared.state.job = ""
            shared.state.job_count = 0

            if extra_outputs_array is None:
                extra_outputs_array = [None, '']

            res = extra_outputs_array + [f"<div class='error'>{html.escape(type(e).__name__+': '+str(e))}</div>"]

        shared.state.skipped = False
        shared.state.interrupted = False
        shared.state.job_count = 0

        if not add_stats:
            return tuple(res)

        elapsed = time.perf_counter() - t
        elapsed_m = int(elapsed // 60)
        elapsed_s = elapsed % 60
        elapsed_text = f"{elapsed_s:.2f}s"
        if elapsed_m > 0:
            elapsed_text = f"{elapsed_m}m "+elapsed_text

        if run_memmon:
            mem_stats = {k: -(v//-(1024*1024)) for k, v in shared.mem_mon.stop().items()}
            active_peak = mem_stats['active_peak']
            reserved_peak = mem_stats['reserved_peak']
            sys_peak = mem_stats['system_peak']
            sys_total = mem_stats['total']
            sys_pct = round(sys_peak/max(sys_total, 1) * 100, 2)

            vram_html = f"<p class='vram'>Torch active/reserved: {active_peak}/{reserved_peak} MiB, <wbr>Sys VRAM: {sys_peak}/{sys_total} MiB ({sys_pct}%)</p>"
        else:
            vram_html = ''

        # last item is always HTML
        res[-1] += f"<div class='performance'><p class='time'>Time taken: <wbr>{elapsed_text}</p>{vram_html}</div>"

        return tuple(res)

    return f