import os
import re
import sys
import uuid
import time
import datetime
from modules.errors import log, display


debug_output = os.environ.get('SD_STATE_DEBUG', None)
debug_history = debug_output or os.environ.get('SD_STATE_HISTORY', None)


class State:
    state_history = []
    job_history = 0
    task_history = 0
    image_history = 0
    latent_history = 0
    id = 0
    results = []
    skipped = False
    interrupted = False
    paused = False
    job = ""
    job_no = 0
    job_count = 0
    batch_no = 0
    batch_count = 0
    frame_count = 0
    total_jobs = 0
    job_timestamp = '0'
    _sampling_step = 0
    sampling_steps = 0
    current_latent = None
    current_noise_pred = None
    current_sigma = None
    current_sigma_next = None
    current_image = None
    current_image_sampling_step = 0
    id_live_preview = 0
    textinfo = None
    prediction_type = "epsilon"
    api = False
    disable_preview = False
    preview_job = -1
    time_start = None
    duration = None
    need_restart = False
    server_start = time.time()
    oom = False

    def __init__(self):
        log.debug(f'State initialized: id={id(self)}')

    def __str__(self) -> str:
        status = ' '
        status += 'skipped ' if self.skipped else ''
        status += 'interrupted ' if self.interrupted else ''
        status += 'paused ' if self.paused else ''
        status += 'restart ' if self.need_restart else ''
        status += 'oom ' if self.oom else ''
        status += 'api ' if self.api else ''
        fn = f'{sys._getframe(3).f_code.co_name}:{sys._getframe(2).f_code.co_name}' # pylint: disable=protected-access
        return f'State: ts={self.job_timestamp} job={self.job} jobs={self.job_no+1}/{self.job_count}/{self.total_jobs} step={self.sampling_step}/{self.sampling_steps} preview={self.preview_job}/{self.id_live_preview}/{self.current_image_sampling_step} status="{status.strip()}" fn={fn}'

    @property
    def sampling_step(self):
        return self._sampling_step

    @sampling_step.setter
    def sampling_step(self, value):
        self._sampling_step = value
        if debug_output:
            log.trace(f'State step: {self}')

    def skip(self):
        log.debug('State: skip requested')
        self.skipped = True

    def interrupt(self):
        log.debug('State: interrupt requested')
        self.interrupted = True

    def pause(self):
        self.paused = not self.paused
        log.debug(f'State: {"pause" if self.paused else "continue"} requested')

    def nextjob(self):
        import modules.devices
        self.do_set_current_image()
        self.job_no += 1
        # self.sampling_step = 0
        self.current_image_sampling_step = 0
        if debug_output:
            log.trace(f'State next: {self}')
        modules.devices.torch_gc()

    def dict(self):
        obj = {
            "skipped": self.skipped,
            "interrupted": self.interrupted,
            "job": self.job,
            "job_count": self.job_count,
            "job_timestamp": self.job_timestamp,
            "job_no": self.job_no,
            "sampling_step": self.sampling_step,
            "sampling_steps": self.sampling_steps,
        }
        return obj

    def status(self):
        from modules import progress
        from modules.api import models
        res = models.ResStatus(
            task=self.job,
            current=progress.current_task or '',
            id=self.id,
            job=max(self.job_no, 0),
            jobs=max(self.frame_count, self.job_count, self.job_no),
            total=self.total_jobs,
            timestamp=self.job_timestamp if self.job != '' else None,
            step=self.sampling_step,
            steps=self.sampling_steps,
            queued=len(progress.pending_tasks),
            status='unknown',
            uptime = round(time.time() - self.server_start)
        )
        res.step = res.steps * res.job + res.step
        res.steps = res.steps * res.jobs
        res.progress = round(min(1, abs(res.step / res.steps) if res.steps > 0 else 0), 2)
        res.elapsed = round(time.time() - self.time_start, 2) if self.time_start is not None else None
        predicted = round(res.elapsed / res.progress, 2) if res.progress > 0 and res.elapsed is not None else None
        res.eta = round(predicted - res.elapsed, 2) if predicted is not None else None
        if self.paused:
            res.status = 'paused'
        elif self.interrupted:
            res.status = 'interrupted'
        elif self.skipped:
            res.status = 'skipped'
        else:
            res.status = 'running' if self.job != '' else 'idle'
        return res

    def find(self, task_id:str):
        for job in reversed(self.state_history):
            if job['id'] == task_id:
                return job
        return None

    def history(self, op:str, task_id:str=None, results:list=[]):
        job = {
            'id': task_id or self.id,
            'job': self.job.lower(),
            'op': op.lower(),
            'timestamp': self.time_start,
            'duration': self.duration,
            'outputs': results,
         }
        self.state_history.append(job)
        l = len(self.state_history)
        if l > 10000:
            del self.state_history[0]
        if debug_history:
            log.trace(f'State history: jobs={l} {job}')

    def outputs(self, results):
        if isinstance(results, list):
            self.results += results
        else:
            self.results.append(results)
        if len(self.results) > 0:
            self.history('output', self.id, results=self.results)

    def get_id(self, task_id:str=None):
        if task_id is None or task_id == 0:
            task_id = uuid.uuid4().hex[:15]
        if not isinstance(task_id, str):
            task_id = str(task_id)
        match = re.search(r'\((.*?)\)', task_id)
        return match.group(1) if match else task_id

    def clear(self):
        self.id = ''
        self.job = ''
        self.job_count = 0
        self.job_no = 0
        self.frame_count = 0
        self.preview_job = -1
        self.duration = None
        self.paused = False
        self.results = []

    def begin(self, title="", task_id=0, api=None):
        import modules.devices
        self.clear()
        self.interrupted = self.interrupted if title.startswith('Save') else False
        self.skipped = False
        self.job_history += 1
        self.total_jobs += 1
        self.current_image = None
        self.current_image_sampling_step = 0
        self.current_latent = None
        self.current_noise_pred = None
        self.current_sigma = None
        self.current_sigma_next = None
        self.id_live_preview = 0
        self.id = self.get_id(task_id)
        self.job = title
        self.job_count = 1 # cannot be less than 1 on new job
        self.batch_no = 0
        self.batch_count = 0
        self.job_timestamp = datetime.datetime.now().strftime("%Y%m%d%H%M%S")
        self._sampling_step = 0
        self.sampling_steps = 0
        self.textinfo = None
        self.prediction_type = "epsilon"
        self.api = api or self.api
        self.time_start = time.time()
        self.history('begin', self.id)
        if debug_output:
            log.trace(f'State begin: {self}')
        modules.devices.torch_gc()
        return self.id

    def end(self, task_id=None):
        import modules.devices
        if debug_output:
            log.trace(f'State end: {self}')
        if task_id is not None:
            prev_job = self.find(task_id)
            if prev_job is not None:
                self.id = prev_job['id']
                self.job = prev_job['job']
                self.duration = round(time.time() - prev_job['timestamp'], 3) if prev_job['timestamp'] is not None else None
        self.time_start = time.time()
        self.history('end', task_id or self.id)
        self.clear()
        modules.devices.torch_gc()

    def step(self, step:int=1):
        self.sampling_step += step

    def update(self, job:str, steps:int=0, jobs:int=0):
        self.task_history += 1
        # self._sampling_step = 0
        if job == 'Ignore':
            return
        elif job == 'Grid':
            self.sampling_steps = steps
            self.job_count = jobs
        else:
            self.sampling_steps += (steps * jobs)
            self.job_count += jobs
        # self.job = job
        if debug_output:
            log.trace(f'State update: {self} steps={steps} jobs={jobs}')

    def set_current_image(self):
        if self.job == 'VAE' or self.job == 'Upscale': # avoid generating preview while vae is running
            return False
        from modules.shared import opts, cmd_opts
        if cmd_opts.lowvram or self.api or (opts.show_progress_every_n_steps <= 0):
            return False
        if (not self.disable_preview) and (abs(self.sampling_step - self.current_image_sampling_step) >= opts.show_progress_every_n_steps):
            return self.do_set_current_image()
        return False

    def do_set_current_image(self):
        if (self.current_latent is None) or self.disable_preview or (self.preview_job == self.job_no):
            return False
        from modules import shared, sd_samplers
        self.preview_job = self.job_no
        try:
            sample = self.current_latent
            self.current_image_sampling_step = self.sampling_step
            try:
                if self.current_noise_pred is not None and self.current_sigma is not None and self.current_sigma_next is not None:
                    original_sample = sample - (self.current_noise_pred * (self.current_sigma_next-self.current_sigma))
                    if self.prediction_type in {"epsilon", "flow_prediction"}:
                        sample = original_sample - (self.current_noise_pred * self.current_sigma)
                    elif self.prediction_type == "v_prediction":
                        sample = self.current_noise_pred * (-self.current_sigma / (self.current_sigma**2 + 1) ** 0.5) + (original_sample / (self.current_sigma**2 + 1)) # pylint: disable=invalid-unary-operand-type
            except Exception:
                pass # ignore sigma errors
            image = sd_samplers.samples_to_image_grid(sample) if shared.opts.show_progress_grid else sd_samplers.sample_to_image(sample)
            self.assign_current_image(image)
            self.preview_job = -1
            return True
        except Exception as e:
            self.preview_job = -1
            log.error(f'State image: last={self.id_live_preview} step={self.sampling_step} {e}')
            display(e, 'State image')
            return False

    def assign_current_image(self, image):
        self.current_image = image
        self.id_live_preview += 1