import abc
from typing import Any
import logging
import re

import httpx

from gistillery.base import JobInput

logger = logging.getLogger(__name__)
logger.setLevel(logging.DEBUG)


class Processor(abc.ABC):
    def get_name(self) -> str:
        return self.__class__.__name__

    def __call__(self, job: JobInput) -> str:
        _id = job.id
        logger.info(f"Processing {input} with {self.__class__.__name__} (id={_id[:8]})")
        result = self.process(job)
        logger.info(f"Finished processing input (id={_id[:8]})")
        return result

    @abc.abstractmethod
    def process(self, input: JobInput) -> str:
        raise NotImplementedError

    @abc.abstractmethod
    def match(self, input: JobInput) -> bool:
        raise NotImplementedError


class Summarizer(abc.ABC):
    def __init__(self, model_name: str, model: Any, tokenizer: Any, generation_config: Any) -> None:
        raise NotImplementedError

    def get_name(self) -> str:
        raise NotImplementedError

    @abc.abstractmethod
    def __call__(self, x: str) -> str:
        raise NotImplementedError


class Tagger(abc.ABC):
    def __init__(self, model_name: str, model: Any, tokenizer: Any, generation_config: Any) -> None:
        raise NotImplementedError

    def get_name(self) -> str:
        raise NotImplementedError

    @abc.abstractmethod
    def __call__(self, x: str) -> list[str]:
        raise NotImplementedError


class MlRegistry:
    def __init__(self) -> None:
        self.processors: list[Processor] = []
        self.summerizer: Summarizer | None = None
        self.tagger: Tagger | None = None
        self.model = None
        self.tokenizer = None

    def register_processor(self, processor: Processor) -> None:
        self.processors.append(processor)

    def register_summarizer(self, summarizer: Summarizer) -> None:
        self.summerizer = summarizer

    def register_tagger(self, tagger: Tagger) -> None:
        self.tagger = tagger

    def get_processor(self, input: JobInput) -> Processor:
        assert self.processors
        for processor in self.processors:
            if processor.match(input):
                return processor

        return RawTextProcessor()

    def get_summarizer(self) -> Summarizer:
        assert self.summerizer
        return self.summerizer

    def get_tagger(self) -> Tagger:
        assert self.tagger
        return self.tagger


class HfTransformersSummarizer(Summarizer):
    def __init__(self, model_name: str, model: Any, tokenizer: Any, generation_config: Any) -> None:
        self.model_name = model_name
        self.model = model
        self.tokenizer = tokenizer
        self.generation_config = generation_config

        self.template = "Summarize the text below in two sentences:\n\n{}"

    def __call__(self, x: str) -> str:
        text = self.template.format(x)
        inputs = self.tokenizer(text, return_tensors="pt")
        outputs = self.model.generate(**inputs, generation_config=self.generation_config)
        output = self.tokenizer.batch_decode(outputs, skip_special_tokens=True)[0]
        assert isinstance(output, str)
        return output

    def get_name(self) -> str:
        return f"{self.__class__.__name__}({self.model_name})"


class HfTransformersTagger(Tagger):
    def __init__(self, model_name: str, model: Any, tokenizer: Any, generation_config: Any) -> None:
        self.model_name = model_name
        self.model = model
        self.tokenizer = tokenizer
        self.generation_config = generation_config

        self.template = (
            "Create a list of tags for the text below. The tags should be high level "
            "and specific. Prefix each tag with a hashtag.\n\n{}\n\nTags: #general"
        )

    def _extract_tags(self, text: str) -> list[str]:
        tags = set()
        for tag in text.split():
            if tag.startswith("#"):
                tags.add(tag.lower())
        return sorted(tags)

    def __call__(self, x: str) -> list[str]:
        text = self.template.format(x)
        inputs = self.tokenizer(text, return_tensors="pt")
        outputs = self.model.generate(**inputs, generation_config=self.generation_config)
        output = self.tokenizer.batch_decode(outputs, skip_special_tokens=True)[0]
        tags = self._extract_tags(output)
        return tags

    def get_name(self) -> str:
        return f"{self.__class__.__name__}({self.model_name})"


class RawTextProcessor(Processor):
    def match(self, input: JobInput) -> bool:
        return True

    def process(self, input: JobInput) -> str:
        return input.content


class DefaultUrlProcessor(Processor):
    def __init__(self) -> None:
        self.client = httpx.Client()
        self.regex = re.compile(r"(https?://[^\s]+)")
        self.url = None
        self.template = "{url}\n\n{content}"

    def match(self, input: JobInput) -> bool:
        urls = list(self.regex.findall(input.content))
        if len(urls) == 1:
            self.url = urls[0]
            return True
        return False

    def process(self, input: JobInput) -> str:
        """Get content of website and return it as string"""
        assert isinstance(self.url, str)
        text = self.client.get(self.url).text
        assert isinstance(text, str)
        text = self.template.format(url=self.url, content=text)
        return text

# class ProcessorRegistry:
#     def __init__(self) -> None:
#         self.registry: list[Processor] = []
#         self.default_registry: list[Processor] = []
#         self.set_default_processors()

#     def set_default_processors(self) -> None:
#         self.default_registry.extend([PlainUrlProcessor(), RawProcessor()])

#     def register(self, processor: Processor) -> None:
#         self.registry.append(processor)

#     def dispatch(self, input: JobInput) -> Processor:
#         for processor in self.registry + self.default_registry:
#             if processor.match(input):
#                 return processor

#         # should never be requires, but eh
#         return RawProcessor()