"""OpenAI client."""
import ast
import logging
import sqlite3
import sys
from dataclasses import dataclass, field
from pathlib import Path
from time import sleep
from typing import Iterator, Tuple

import numpy as np
import openai
from oaklib.utilities.apikey_manager import get_apikey_value

logger = logging.getLogger(__name__)
NUM_RETRIES = 3


@dataclass
class OpenAIClient:
    # max_tokens: int = field(default_factory=lambda: 3000)
    model: str = field(default_factory=lambda: "gpt-3.5-turbo")
    cache_db_path: str = None
    api_key: str = None
    interactive: bool = None

    def __post_init__(self):
        if not self.api_key:
            self.api_key = get_apikey_value("openai")
        openai.api_key = self.api_key

    def complete(self, prompt, show_prompt: bool = False, max_tokens=3000, **kwargs) -> str:
        engine = self.model
        logger.info(f"Complete: engine={engine}, prompt[{len(prompt)}]={prompt[0:100]}...")
        if show_prompt:
            logger.info(f" SENDING PROMPT:\n{prompt}")
        cur = self.db_connection()
        res = cur.execute("SELECT payload FROM cache WHERE prompt=? AND engine=?", (prompt, engine))
        payload = res.fetchone()
        if payload:
            prompt_peek = str(prompt)[0:80].replace("\n", "\\n")
            logger.info(f"Using cached payload for prompt: {prompt_peek}...")
            return payload[0]
        response = None
        i = 0
        while not response:
            i += 1
            logger.debug(f"Calling OpenAI API (attempt {i})...")
            try:
                if self.interactive:
                    response = self._interactive_completion(prompt, engine, max_tokens, **kwargs)
                elif self._must_use_chat_api():
                    response = openai.ChatCompletion.create(
                        model=engine,
                        messages=[
                            {
                                "role": "user",
                                "content": prompt,
                            },
                        ],
                        max_tokens=max_tokens,
                        **kwargs,
                    )
                else:
                    response = openai.Completion.create(
                        engine=engine,
                        prompt=prompt,
                        max_tokens=max_tokens,
                    )
                break
            except Exception as e:
                logger.error(f"OpenAI API connection error: {e}")
                if i >= NUM_RETRIES:
                    raise e
                sleep_time = 4**i
                logger.info(f"Retrying {i} of {NUM_RETRIES} after {sleep_time} seconds...")
                sleep(sleep_time)

        if self.interactive:
            payload = response
        elif self._must_use_chat_api():
            payload = response["choices"][0]["message"]["content"]
        else:
            payload = response["choices"][0]["text"]
        logger.info(f"Storing payload of len: {len(payload)}")
        cur.execute(
            "INSERT INTO cache (prompt, engine, payload) VALUES (?, ?, ?)",
            (prompt, engine, payload),
        )
        cur.connection.commit()
        return payload

    def db_connection(self):
        if not self.cache_db_path:
            self.cache_db_path = ".openai_cache.db"
        logger.info(f"Caching OpenAI responses to {Path(self.cache_db_path).absolute()}")
        create = not Path(self.cache_db_path).exists()
        con = sqlite3.connect(self.cache_db_path)
        cur = con.cursor()
        if create:
            cur.execute("CREATE TABLE cache (prompt, engine, payload)")
        return cur

    def _interactive_completion(self, prompt: str, engine: str, max_tokens: int = None, **kwargs):
        print("Please use the ChatGPT interface to complete the following prompt:")
        print(f"IMPORTANT: make sure model == {engine}")
        print(f"Note: max_tokens == {max_tokens}")
        print("Prompt:")
        print(prompt)
        print("Paste in the response here, then ctrl-d to continue:")
        response = sys.stdin.read()
        print("OK? (y/n)")
        ok = input()
        if ok == "y":
            print("Thank you! This will now be cached.")
            print("Please be patient for the rest of the process to finish...")
            return response
        else:
            return self._interactive_completion(prompt, engine, max_tokens, **kwargs)

    def cached_completions(
        self, search_term: str = None, engine: str = None
    ) -> Iterator[Tuple[str, str, str]]:
        if search_term:
            search_term = search_term.lower()
        cur = self.db_connection()
        res = cur.execute("SELECT engine, prompt, payload FROM cache")
        for row in res:
            if (
                search_term
                and search_term not in row[1].lower()
                and search_term not in row[2].lower()
            ):
                continue
            if engine and engine != row[0]:
                continue
            yield row

    def _must_use_chat_api(self) -> bool:
        """Return True if the model requires the chat API, False otherwise."""
        if self.model.startswith("text-davinci"):
            return False
        return True

    def embeddings(self, text: str, model: str = None):

        text = str(text)

        if model is None:
            model = "text-embedding-ada-002"
        cur = self.db_connection()
        try:
            logger.info("creating embeddings cache")
            cur.execute("CREATE TABLE embeddings_cache (text, engine, vector_as_string)")
        except sqlite3.OperationalError:
            logger.info("Embeddings cache table already exists")
            pass
        res = cur.execute(
            "SELECT vector_as_string FROM embeddings_cache WHERE text=? AND engine=?", (text, model)
        )
        payload = res.fetchone()
        if payload:
            logger.info(f"Using cached embeddings for {model} {text[0:80]}...")
            return ast.literal_eval(payload[0])
        logger.info(f"querying OpenAI for {model} {text[0:80]}...")
        response = openai.Embedding.create(
            model=model,
            input=text,
        )
        v = response.data[0]["embedding"]
        logger.info(f"Storing embeddings of len: {len(v)}")
        cur.execute(
            "INSERT INTO embeddings_cache (text, engine, vector_as_string) VALUES (?, ?, ?)",
            (text, model, str(v)),
        )
        cur.connection.commit()
        return v

    def similarity(self, text1: str, text2: str, **kwargs):
        a1 = self.embeddings(text1, **kwargs)
        a2 = self.embeddings(text2, **kwargs)
        logger.debug(f"similarity: {a1[0:10]}... x {a2[0:10]}... // ({len(a1)} x {len(a2)})")
        return np.dot(a1, a2) / (np.linalg.norm(a1) * np.linalg.norm(a2))

    def euclidian_distance(self, text1: str, text2: str, **kwargs):
        a1 = self.embeddings(text1, **kwargs)
        a2 = self.embeddings(text2, **kwargs)
        return np.linalg.norm(np.array(a1) - np.array(a2))
