import base64
import io
import os
import re
import json
from PIL import Image
import gradio as gr
from modules.paths import data_path
from modules import shared, gr_tempdir, script_callbacks, images


type_of_gr_update = type(gr.update())
paste_fields = {}
registered_param_bindings = []
debug = shared.log.trace if os.environ.get('SD_PASTE_DEBUG', None) is not None else lambda *args, **kwargs: None
debug('Trace: PASTE')


class ParamBinding:
    def __init__(self, paste_button, tabname, source_text_component=None, source_image_component=None, source_tabname=None, override_settings_component=None, paste_field_names=None):
        self.paste_button = paste_button
        self.tabname = tabname
        self.source_text_component = source_text_component
        self.source_image_component = source_image_component
        self.source_tabname = source_tabname
        self.override_settings_component = override_settings_component
        self.paste_field_names = paste_field_names or []
        debug(f'ParamBinding: {vars(self)}')


def reset():
    paste_fields.clear()


def quote(text):
    if ',' not in str(text) and '\n' not in str(text) and ':' not in str(text):
        return text
    return json.dumps(text, ensure_ascii=False)


def unquote(text):
    if len(text) == 0 or text[0] != '"' or text[-1] != '"':
        return text
    try:
        return json.loads(text)
    except Exception:
        return text


def image_from_url_text(filedata):
    if filedata is None:
        return None
    if type(filedata) == list and len(filedata) > 0 and type(filedata[0]) == dict and filedata[0].get("is_file", False):
        filedata = filedata[0]
    if type(filedata) == dict and filedata.get("is_file", False):
        filename = filedata["name"]
        is_in_right_dir = gr_tempdir.check_tmp_file(shared.demo, filename)
        if is_in_right_dir:
            filename = filename.rsplit('?', 1)[0]
            if not os.path.exists(filename):
                shared.log.error(f'Image file not found: {filename}')
                image = Image.new('RGB', (512, 512))
                image.info['parameters'] = f'Image file not found: {filename}'
                return image
            image = Image.open(filename)
            geninfo, _items = images.read_info_from_image(image)
            image.info['parameters'] = geninfo
            return image
        else:
            shared.log.warning(f'File access denied: {filename}')
            return None
    if type(filedata) == list:
        if len(filedata) == 0:
            return None
        filedata = filedata[0]
    if type(filedata) == dict:
        shared.log.warning('Incorrect filedata received')
        return None
    if filedata.startswith("data:image/png;base64,"):
        filedata = filedata[len("data:image/png;base64,"):]
    if filedata.startswith("data:image/webp;base64,"):
        filedata = filedata[len("data:image/webp;base64,"):]
    if filedata.startswith("data:image/jpeg;base64,"):
        filedata = filedata[len("data:image/jpeg;base64,"):]
    filedata = base64.decodebytes(filedata.encode('utf-8'))
    image = Image.open(io.BytesIO(filedata))
    images.read_info_from_image(image)
    return image


def add_paste_fields(tabname, init_img, fields, override_settings_component=None):
    paste_fields[tabname] = {"init_img": init_img, "fields": fields, "override_settings_component": override_settings_component}
    # backwards compatibility for existing extensions
    import modules.ui
    if tabname == 'txt2img':
        modules.ui.txt2img_paste_fields = fields
    elif tabname == 'img2img':
        modules.ui.img2img_paste_fields = fields


def create_buttons(tabs_list):
    buttons = {}
    for tab in tabs_list:
        name = tab
        if name == 'txt2img':
            name = 'Text'
        elif name == 'img2img':
            name = 'Image'
        elif name == 'inpaint':
            name = 'Inpaint'
        elif name == 'extras':
            name = 'Process'
        elif name == 'control':
            name = 'Control'
        buttons[tab] = gr.Button(f"➠ {name}", elem_id=f"{tab}_tab")
    return buttons


def bind_buttons(buttons, send_image, send_generate_info):
    """old function for backwards compatibility; do not use this, use register_paste_params_button"""
    for tabname, button in buttons.items():
        source_text_component = send_generate_info if isinstance(send_generate_info, gr.components.Component) else None
        source_tabname = send_generate_info if isinstance(send_generate_info, str) else None
        bindings = ParamBinding(paste_button=button, tabname=tabname, source_text_component=source_text_component, source_image_component=send_image, source_tabname=source_tabname)
        register_paste_params_button(bindings)


def register_paste_params_button(binding: ParamBinding):
    registered_param_bindings.append(binding)


def connect_paste_params_buttons():
    binding: ParamBinding
    for binding in registered_param_bindings:
        if binding.tabname not in paste_fields:
            debug(f"Not not registered: tab={binding.tabname}")
            continue
        destination_image_component = paste_fields[binding.tabname]["init_img"]
        fields = paste_fields[binding.tabname]["fields"]
        override_settings_component = binding.override_settings_component or paste_fields[binding.tabname]["override_settings_component"]
        destination_width_component = next(iter([field for field, name in fields if name == "Size-1"] if fields else []), None)
        destination_height_component = next(iter([field for field, name in fields if name == "Size-2"] if fields else []), None)

        if binding.source_image_component and destination_image_component:
            if isinstance(binding.source_image_component, gr.Gallery):
                func = send_image_and_dimensions if destination_width_component else image_from_url_text
                jsfunc = "extract_image_from_gallery"
            else:
                func = send_image_and_dimensions if destination_width_component else lambda x: x
                jsfunc = None
            binding.paste_button.click(
                fn=func,
                _js=jsfunc,
                inputs=[binding.source_image_component],
                outputs=[destination_image_component, destination_width_component, destination_height_component] if destination_width_component else [destination_image_component],
                show_progress=False,
            )
        if binding.source_text_component is not None and fields is not None:
            connect_paste(binding.paste_button, fields, binding.source_text_component, override_settings_component, binding.tabname)
        if binding.source_tabname is not None and fields is not None:
            paste_field_names = ['Prompt', 'Negative prompt', 'Steps', 'Face restoration'] + (["Seed"] if shared.opts.send_seed else []) + binding.paste_field_names
            binding.paste_button.click(
                fn=lambda *x: x,
                inputs=[field for field, name in paste_fields[binding.source_tabname]["fields"] if name in paste_field_names],
                outputs=[field for field, name in fields if name in paste_field_names],
            )
        binding.paste_button.click(
            fn=None,
            _js=f"switch_to_{binding.tabname}",
            inputs=[],
            outputs=[],
            show_progress=False,
        )


def send_image_and_dimensions(x):
    img = x if isinstance(x, Image.Image) else image_from_url_text(x)
    if shared.opts.send_size and isinstance(img, Image.Image):
        w = img.width
        h = img.height
    else:
        w = gr.update()
        h = gr.update()
    return img, w, h


def parse_generation_parameters(infotext):
    if not isinstance(infotext, str):
        return {}
    debug(f'Parse infotext: {infotext}')
    re_param = re.compile(r'\s*([\w ]+):\s*("(?:\\"[^,]|\\"|\\|[^\"])+"|[^,]*)(?:,|$)') # multi-word: value
    re_size = re.compile(r"^(\d+)x(\d+)$") # int x int
    sanitized = infotext.replace('prompt:', 'Prompt:').replace('negative prompt:', 'Negative prompt:').replace('Negative Prompt', 'Negative prompt') # cleanup everything in brackets so re_params can work
    sanitized = re.sub(r'<[^>]*>', lambda match: ' ' * len(match.group()), sanitized)
    sanitized = re.sub(r'\([^)]*\)', lambda match: ' ' * len(match.group()), sanitized)
    sanitized = re.sub(r'\{[^}]*\}', lambda match: ' ' * len(match.group()), sanitized)

    params = dict(re_param.findall(sanitized))
    debug(f"Parse params: {params}")
    params = { k.strip():params[k].strip() for k in params if k.lower() not in ['hashes', 'lora', 'embeddings', 'prompt', 'negative prompt']} # remove some keys
    first_param = next(iter(params)) if params else None
    params_idx = sanitized.find(f'{first_param}:') if first_param else -1
    negative_idx = infotext.find("Negative prompt:")

    prompt = infotext[:params_idx] if negative_idx == -1 else infotext[:negative_idx] # prompt can be with or without negative prompt
    negative = infotext[negative_idx:params_idx] if negative_idx >= 0 else ''

    for k, v in params.copy().items(): # avoid dict-has-changed
        if len(v) > 0 and v[0] == '"' and v[-1] == '"':
            v = unquote(v)
        m = re_size.match(v)
        if v.replace('.', '', 1).isdigit():
            params[k] = float(v) if '.' in v else int(v)
        elif v == "True":
            params[k] = True
        elif v == "False":
            params[k] = False
        elif m is not None:
            params[f"{k}-1"] = int(m.group(1))
            params[f"{k}-2"] = int(m.group(2))
        elif k == 'VAE' and v == 'TAESD':
            params["Full quality"] = False
        else:
            params[k] = v
    params["Prompt"] = prompt.replace('Prompt:', '').strip()
    params["Negative prompt"] = negative.replace('Negative prompt:', '').strip()
    debug(f"Parse: {params}")
    return params


settings_map = {}


infotext_to_setting_name_mapping = [
    ('Backend', 'sd_backend'),
    ('Model hash', 'sd_model_checkpoint'),
    ('Refiner', 'sd_model_refiner'),
    ('VAE', 'sd_vae'),
    ('Parser', 'prompt_attention'),
    ('Color correction', 'img2img_color_correction'),
    # Samplers
    ('Sampler Eta', 'scheduler_eta'),
    ('Sampler ENSD', 'eta_noise_seed_delta'),
    ('Sampler order', 'schedulers_solver_order'),
    # Samplers diffusers
    ('Sampler beta schedule', 'schedulers_beta_schedule'),
    ('Sampler beta start', 'schedulers_beta_start'),
    ('Sampler beta end', 'schedulers_beta_end'),
    ('Sampler DPM solver', 'schedulers_dpm_solver'),
    # Samplers original
    ('Sampler brownian', 'schedulers_brownian_noise'),
    ('Sampler discard', 'schedulers_discard_penultimate'),
    ('Sampler dyn threshold', 'schedulers_use_thresholding'),
    ('Sampler karras', 'schedulers_use_karras'),
    ('Sampler low order', 'schedulers_use_loworder'),
    ('Sampler quantization', 'enable_quantization'),
    ('Sampler sigma', 'schedulers_sigma'),
    ('Sampler sigma min', 's_min'),
    ('Sampler sigma max', 's_max'),
    ('Sampler sigma churn', 's_churn'),
    ('Sampler sigma uncond', 's_min_uncond'),
    ('Sampler sigma noise', 's_noise'),
    ('Sampler sigma tmin', 's_tmin'),
    ('Sampler ENSM', 'initial_noise_multiplier'), # img2img only
    ('UniPC skip type', 'uni_pc_skip_type'),
    ('UniPC variant', 'uni_pc_variant'),
    # Token Merging
    ('Mask weight', 'inpainting_mask_weight'),
    ('Token merging ratio', 'token_merging_ratio'),
    ('ToMe', 'token_merging_ratio'),
    ('ToMe hires', 'token_merging_ratio_hr'),
    ('ToMe img2img', 'token_merging_ratio_img2img'),
]


def create_override_settings_dict(text_pairs):
    res = {}
    params = {}
    for pair in text_pairs:
        k, v = pair.split(":", maxsplit=1)
        params[k] = v.strip()
    for param_name, setting_name in infotext_to_setting_name_mapping:
        value = params.get(param_name, None)
        if value is None:
            continue
        res[setting_name] = shared.opts.cast_value(setting_name, value)
    return res


def connect_paste(button, local_paste_fields, input_comp, override_settings_component, tabname):

    def paste_func(prompt):
        if prompt is None or len(prompt.strip()) == 0 and not shared.cmd_opts.hide_ui_dir_config:
            filename = os.path.join(data_path, "params.txt")
            if os.path.exists(filename):
                with open(filename, "r", encoding="utf8") as file:
                    prompt = file.read()
                shared.log.debug(f'Paste prompt: type="params" prompt="{prompt}"')
            else:
                prompt = ''
        else:
            shared.log.debug(f'Paste prompt: type="current" prompt="{prompt}"')
        params = parse_generation_parameters(prompt)
        script_callbacks.infotext_pasted_callback(prompt, params)
        res = []
        applied = {}
        for output, key in local_paste_fields:
            if callable(key):
                v = key(params)
            else:
                v = params.get(key, None)
            if v is None:
                res.append(gr.update())
            elif isinstance(v, type_of_gr_update):
                res.append(v)
                applied[key] = v
            else:
                try:
                    valtype = type(output.value)
                    if valtype == bool and v == "False":
                        val = False
                    else:
                        val = valtype(v)
                    res.append(gr.update(value=val))
                    applied[key] = val
                except Exception:
                    res.append(gr.update())
        debug(f"Parse apply: {applied}")
        return res

    if override_settings_component is not None:
        def paste_settings(params):
            vals = {}
            for param_name, setting_name in infotext_to_setting_name_mapping:
                v = params.get(param_name, None)
                if v is None:
                    continue
                if shared.opts.disable_weights_auto_swap:
                    if setting_name == "sd_model_checkpoint" or setting_name == 'sd_model_refiner' or setting_name == 'sd_backend' or setting_name == 'sd_vae':
                        continue
                v = shared.opts.cast_value(setting_name, v)
                current_value = getattr(shared.opts, setting_name, None)
                if v == current_value:
                    continue
                if type(current_value) == str and v == os.path.splitext(current_value)[0]:
                    continue
                vals[param_name] = v
            vals_pairs = [f"{k}: {v}" for k, v in vals.items()]
            shared.log.debug(f'Settings overrides: {vals_pairs}')
            return gr.Dropdown.update(value=vals_pairs, choices=vals_pairs, visible=len(vals_pairs) > 0)
        local_paste_fields = local_paste_fields + [(override_settings_component, paste_settings)]

    button.click(
        fn=paste_func,
        inputs=[input_comp],
        outputs=[x[0] for x in local_paste_fields],
        show_progress=False,
    )
    button.click(
        fn=None,
        _js=f"recalculate_prompts_{tabname}",
        inputs=[],
        outputs=[],
        show_progress=False,
    )