import argparse
import os.path
from typing import Iterable, Optional

import numpy as np
import pandas as pd
import seaborn as sns
import tqdm
from matplotlib import pyplot as plt
from sklearn.manifold import TSNE

search_data = __import__('search-data')

TENSORFLOW_PATH_PREFIX: str = "./"
OUT_DIR: str = os.path.join(os.path.dirname(__file__), "out")


def read_ground_truth(file_path: str, df: pd.DataFrame) -> Iterable[tuple[str, int]]:
    records: list[list[str]] = []

    with open(file_path) as f:
        record_tmp = []
        for line in f:
            line = line.strip()
            if line == '':
                assert len(record_tmp) == 3
                records.append(record_tmp)
                record_tmp = []
            else:
                record_tmp.append(line)

    if len(record_tmp) == 3:
        records.append(record_tmp)

    for query, name, file_name in records:
        assert file_name.startswith(TENSORFLOW_PATH_PREFIX)
        file_name = file_name[len(TENSORFLOW_PATH_PREFIX):]

        row = df[(df.name == name) & (df.file == file_name)]
        assert len(row) == 1

        yield query, row.index[0]


def better_index(li: list[tuple[int, float]], e: int) -> Optional[int]:
    for i, le in enumerate(li):
        if le[0] == e:
            return i

    return None


def plot_df(results, query: str) -> Optional[pd.DataFrame]:
    if results.vectors is not None and results.query_vector is not None:
        tsne_vectors = np.array(results.vectors + [results.query_vector])
        tsne = TSNE(n_components=2, verbose=1, perplexity=1.5, n_iter=3000)
        tsne_results = tsne.fit_transform(tsne_vectors)
        df = pd.DataFrame(columns=['tsne-2d-one', 'tsne-2d-two', 'Query', 'Vector kind'])
        df['tsne-2d-one'] = tsne_results[:, 0]
        df['tsne-2d-two'] = tsne_results[:, 1]
        df['Query'] = [query] * (len(results.vectors) + 1)
        df['Vector kind'] = (['Result'] * len(results.vectors)) + ['Input query']
        return df
    else:
        return None


def main(method: str, file_path: str):
    df = search_data.load_data()
    test_set = list(read_ground_truth(file_path, df))

    precision_sum = 0
    recall_sum = 0

    dfs = []

    for query, expected in tqdm.tqdm(test_set):
        search_results = search_data.search(query, method, df)

        df_q = plot_df(search_results, query)
        if df_q is not None:
            dfs.append(df_q)

        idx = better_index(search_results.indexes_scores, expected)

        if idx is None:
            precision = 0
            recall = 0
        else:
            precision = 1 / (idx + 1)
            recall = 1

        precision_sum += precision
        recall_sum += recall

    if not os.path.isdir(OUT_DIR):
        os.makedirs(OUT_DIR)

    output = "Precision: {0:.2f}%\nRecall: {0:.2f}%\n".format(precision_sum * 100 / len(test_set))

    print(output)
    with open(os.path.join(OUT_DIR, "{0}_prec_recall.txt".format(method)), "w") as f:
        f.write(output)

    if len(dfs) > 0:
        df = pd.concat(dfs)
        plt.figure(figsize=(20, 16))
        sns.scatterplot(
            x="tsne-2d-one", y="tsne-2d-two",
            hue="Query",
            style="Vector kind",
            palette=sns.color_palette("husl", n_colors=10),
            data=df,
            legend="full",
            alpha=1.0
        )
        plt.savefig(os.path.join(OUT_DIR, "{0}_plot.png".format(method)))


if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument("method", help="the method to compare similarities with", type=str)
    parser.add_argument("ground_truth_file", help="file where ground truth comes from", type=str)
    args = parser.parse_args()
    main(args.method, args.ground_truth_file)