import argparse
import json
import logging
import os
import re
import sys
from functools import partial
from pathlib import Path
from typing import Union

import numpy as np

from lm_eval import evaluator, utils
from lm_eval.tasks import TaskManager, include_path, initialize_tasks
from lm_eval.utils import make_table


def _handle_non_serializable(o):
    if isinstance(o, np.int64) or isinstance(o, np.int32):
        return int(o)
    elif isinstance(o, set):
        return list(o)
    else:
        return str(o)


def _int_or_none_list_arg_type(max_len: int, value: str, split_char: str = ","):
    def parse_value(item):
        item = item.strip().lower()
        if item == "none":
            return None
        try:
            return int(item)
        except ValueError:
            raise argparse.ArgumentTypeError(f"{item} is not an integer or None")

    items = [parse_value(v) for v in value.split(split_char)]
    num_items = len(items)

    if num_items == 1:
        # Makes downstream handling the same for single and multiple values
        items = items * max_len
    elif num_items != max_len:
        raise argparse.ArgumentTypeError(
            f"Argument requires {max_len} integers or None, separated by '{split_char}'"
        )

    return items


def parse_eval_args() -> argparse.Namespace:
    parser = argparse.ArgumentParser(formatter_class=argparse.RawTextHelpFormatter)
    parser.add_argument("--model", "-m", default="hf", help="Name of model e.g. `hf`")
    parser.add_argument(
        "--tasks",
        "-t",
        default=None,
        metavar="task1,task2",
        help="To get full list of tasks, use the command lm-eval --tasks list",
    )
    parser.add_argument(
        "--model_args",
        "-a",
        default="",
        help="Comma separated string arguments for model, e.g. `pretrained=EleutherAI/pythia-160m,dtype=float32`",
    )
    parser.add_argument(
        "--num_fewshot",
        "-f",
        type=int,
        default=None,
        metavar="N",
        help="Number of examples in few-shot context",
    )
    parser.add_argument(
        "--batch_size",
        "-b",
        type=str,
        default=1,
        metavar="auto|auto:N|N",
        help="Acceptable values are 'auto', 'auto:N' or N, where N is an integer. Default 1.",
    )
    parser.add_argument(
        "--max_batch_size",
        type=int,
        default=None,
        metavar="N",
        help="Maximal batch size to try with --batch_size auto.",
    )
    parser.add_argument(
        "--device",
        type=str,
        default=None,
        help="Device to use (e.g. cuda, cuda:0, cpu).",
    )
    parser.add_argument(
        "--output_path",
        "-o",
        default=None,
        type=str,
        metavar="DIR|DIR/file.json",
        help="The path to the output file where the result metrics will be saved. If the path is a directory and log_samples is true, the results will be saved in the directory. Else the parent directory will be used.",
    )
    parser.add_argument(
        "--limit",
        "-L",
        type=float,
        default=None,
        metavar="N|0<N<1",
        help="Limit the number of examples per task. "
        "If <1, limit is a percentage of the total number of examples.",
    )
    parser.add_argument(
        "--use_cache",
        "-c",
        type=str,
        default=None,
        metavar="DIR",
        help="A path to a sqlite db file for caching model responses. `None` if not caching.",
    )
    parser.add_argument("--decontamination_ngrams_path", default=None)  # TODO: not used
    parser.add_argument(
        "--check_integrity",
        action="store_true",
        help="Whether to run the relevant part of the test suite for the tasks.",
    )
    parser.add_argument(
        "--write_out",
        "-w",
        action="store_true",
        default=False,
        help="Prints the prompt for the first few documents.",
    )
    parser.add_argument(
        "--log_samples",
        "-s",
        action="store_true",
        default=False,
        help="If True, write out all model outputs and documents for per-sample measurement and post-hoc analysis. Use with --output_path.",
    )
    parser.add_argument(
        "--show_config",
        action="store_true",
        default=False,
        help="If True, shows the the full config of all tasks at the end of the evaluation.",
    )
    parser.add_argument(
        "--include_path",
        type=str,
        default=None,
        metavar="DIR",
        help="Additional path to include if there are external tasks to include.",
    )
    parser.add_argument(
        "--gen_kwargs",
        default=None,
        help=(
            "String arguments for model generation on greedy_until tasks,"
            " e.g. `temperature=0,top_k=0,top_p=0`."
        ),
    )
    parser.add_argument(
        "--verbosity",
        "-v",
        type=str.upper,
        default="INFO",
        metavar="CRITICAL|ERROR|WARNING|INFO|DEBUG",
        help="Controls the reported logging error level. Set to DEBUG when testing + adding new task configurations for comprehensive log output.",
    )
    parser.add_argument(
        "--predict_only",
        "-x",
        action="store_true",
        default=False,
        help="Use with --log_samples. Only model outputs will be saved and metrics will not be evaluated.",
    )
    parser.add_argument(
        "--seed",
        type=partial(_int_or_none_list_arg_type, 3),
        default="0,1234,1234",  # for backward compatibility
        help=(
            "Set seed for python's random, numpy and torch.\n"
            "Accepts a comma-separated list of 3 values for python's random, numpy, and torch seeds, respectively, "
            "or a single integer to set the same seed for all three.\n"
            "The values are either an integer or 'None' to not set the seed. Default is `0,1234,1234` (for backward compatibility).\n"
            "E.g. `--seed 0,None,8` sets `random.seed(0)` and `torch.manual_seed(8)`. Here numpy's seed is not set since the second value is `None`.\n"
            "E.g, `--seed 42` sets all three seeds to 42."
        ),
    )
    return parser.parse_args()


def cli_evaluate(args: Union[argparse.Namespace, None] = None) -> None:
    if not args:
        # we allow for args to be passed externally, else we parse them ourselves
        args = parse_eval_args()

    eval_logger = utils.eval_logger
    eval_logger.setLevel(getattr(logging, f"{args.verbosity}"))
    eval_logger.info(f"Verbosity set to {args.verbosity}")
    os.environ["TOKENIZERS_PARALLELISM"] = "false"

    if args.predict_only:
        args.log_samples = True
    if (args.log_samples or args.predict_only) and not args.output_path:
        assert args.output_path, "Specify --output_path"

    initialize_tasks(args.verbosity)
    task_manager = TaskManager(args.verbosity, include_path=args.include_path)

    if args.limit:
        eval_logger.warning(
            " --limit SHOULD ONLY BE USED FOR TESTING."
            "REAL METRICS SHOULD NOT BE COMPUTED USING LIMIT."
        )
    if args.include_path is not None:
        eval_logger.info(f"Including path: {args.include_path}")
        include_path(args.include_path)

    if args.tasks is None:
        eval_logger.error("Need to specify task to evaluate.")
        sys.exit()
    elif args.tasks == "list":
        eval_logger.info(
            "Available Tasks:\n - {}".format("\n - ".join(task_manager.all_tasks))
        )
        sys.exit()
    else:
        if os.path.isdir(args.tasks):
            import glob

            task_names = []
            yaml_path = os.path.join(args.tasks, "*.yaml")
            for yaml_file in glob.glob(yaml_path):
                config = utils.load_yaml_config(yaml_file)
                task_names.append(config)
        else:
            task_list = args.tasks.split(",")
            task_names = task_manager.match_tasks(task_list)
            for task in [task for task in task_list if task not in task_names]:
                if os.path.isfile(task):
                    config = utils.load_yaml_config(task)
                    task_names.append(config)
            task_missing = [
                task for task in task_list if task not in task_names and "*" not in task
            ]  # we don't want errors if a wildcard ("*") task name was used

            if task_missing:
                missing = ", ".join(task_missing)
                eval_logger.error(
                    f"Tasks were not found: {missing}\n"
                    f"{utils.SPACING}Try `lm-eval --tasks list` for list of available tasks",
                )
                raise ValueError(
                    f"Tasks not found: {missing}. Try `lm-eval --tasks list` for list of available tasks, or '--verbosity DEBUG' to troubleshoot task registration issues."
                )

    if args.output_path:
        path = Path(args.output_path)
        # check if file or 'dir/results.json' exists
        if path.is_file() or Path(args.output_path).joinpath("results.json").is_file():
            eval_logger.warning(
                f"File already exists at {path}. Results will be overwritten."
            )
            output_path_file = path.joinpath("results.json")
            assert not path.is_file(), "File already exists"
        # if path json then get parent dir
        elif path.suffix in (".json", ".jsonl"):
            output_path_file = path
            path.parent.mkdir(parents=True, exist_ok=True)
            path = path.parent
        else:
            path.mkdir(parents=True, exist_ok=True)
            output_path_file = path.joinpath("results.json")

    eval_logger.info(f"Selected Tasks: {task_names}")
    eval_logger.info("Loading selected tasks...")

    results = evaluator.simple_evaluate(
        model=args.model,
        model_args=args.model_args,
        tasks=task_names,
        num_fewshot=args.num_fewshot,
        batch_size=args.batch_size,
        max_batch_size=args.max_batch_size,
        device=args.device,
        use_cache=args.use_cache,
        limit=args.limit,
        decontamination_ngrams_path=args.decontamination_ngrams_path,
        check_integrity=args.check_integrity,
        write_out=args.write_out,
        log_samples=args.log_samples,
        gen_kwargs=args.gen_kwargs,
        task_manager=task_manager,
        predict_only=args.predict_only,
        random_seed=args.seed[0],
        numpy_random_seed=args.seed[1],
        torch_random_seed=args.seed[2],
    )

    if results is not None:
        if args.log_samples:
            samples = results.pop("samples")
        dumped = json.dumps(
            results, indent=2, default=_handle_non_serializable, ensure_ascii=False
        )
        if args.show_config:
            print(dumped)

        batch_sizes = ",".join(map(str, results["config"]["batch_sizes"]))

        if args.output_path:
            output_path_file.open("w", encoding="utf-8").write(dumped)

            if args.log_samples:
                for task_name, config in results["configs"].items():
                    output_name = "{}_{}".format(
                        re.sub("/|=", "__", args.model_args), task_name
                    )
                    filename = path.joinpath(f"{output_name}.jsonl")
                    samples_dumped = json.dumps(
                        samples[task_name],
                        indent=2,
                        default=_handle_non_serializable,
                        ensure_ascii=False,
                    )
                    filename.write_text(samples_dumped, encoding="utf-8")

        print(
            f"{args.model} ({args.model_args}), gen_kwargs: ({args.gen_kwargs}), limit: {args.limit}, num_fewshot: {args.num_fewshot}, "
            f"batch_size: {args.batch_size}{f' ({batch_sizes})' if batch_sizes else ''}"
        )
        print(make_table(results))
        if "groups" in results:
            print(make_table(results, "groups"))


if __name__ == "__main__":
    cli_evaluate()
