import streamlit as st
import os
import pathlib
import beir
from beir import util
from beir.datasets.data_loader import GenericDataLoader
import pytrec_eval
import pandas as pd
from collections import defaultdict
import json
import copy
import ir_datasets


from constants import BEIR, IR_DATASETS, LOCAL_DATASETS


@st.cache_data
def load_local_corpus(corpus_file, columns_to_combine=["title", "text"]):
    if corpus_file is None:
        return None
    did2text = {}
    id_key = "_id"
    with corpus_file as f:
        for idx, line in enumerate(f):
            uses_bytes = not (type(line) == str)
            if uses_bytes:
                if idx == 0 and "doc_id" in line.decode("utf-8"):
                    continue
                inst = json.loads(line.decode("utf-8"))
            else:
                if idx == 0 and "doc_id" in line:
                    continue
                inst = json.loads(line)
            all_text = " ".join([inst[col] for col in columns_to_combine if col in inst])
            if id_key not in inst:
                id_key = "doc_id"
            did2text[inst[id_key]] = {
                "text": all_text,
                "title": inst["title"] if "title" in inst else "",
            }
    return did2text


@st.cache_data
def load_local_queries(queries_file):
    if queries_file is None:
        return None
    qid2text = {}
    id_key = "_id"
    with queries_file as f:
        for idx, line in enumerate(f):
            uses_bytes = not (type(line) == str)
            if uses_bytes:
                if idx == 0 and "query_id" in line.decode("utf-8"):
                    continue
                inst = json.loads(line.decode("utf-8"))
            else:
                if idx == 0 and "query_id" in line:
                    continue
                inst = json.loads(line)
            if id_key not in inst:
                id_key = "query_id"
            qid2text[inst[id_key]] = inst["text"]
    return qid2text


@st.cache_data
def load_local_qrels(qrels_file):
    if qrels_file is None:
        return None
    qid2did2label = defaultdict(dict)
    with qrels_file as f:
        for idx, line in enumerate(f):
            uses_bytes = not (type(line) == str)
            if uses_bytes:
                if idx == 0 and "qid" in line.decode("utf-8") or "query-id" in line.decode("utf-8"):
                    continue
                cur_line = line.decode("utf-8")
            else:
                if idx == 0 and "qid" in line or "query-id" in line:
                    continue
                cur_line = line
            try:
                qid, _, doc_id, label = cur_line.split()
            except:
                qid, doc_id, label = cur_line.split()
            qid2did2label[str(qid)][str(doc_id)] = int(label)

    return qid2did2label


@st.cache_data
def load_run(f_run):
    run = pytrec_eval.parse_run(copy.deepcopy(f_run))
    # convert bytes to strings for keys
    new_run = defaultdict(dict)
    for key, sub_dict in run.items():
        new_run[key.decode("utf-8")] = {k.decode("utf-8"): v for k, v in sub_dict.items()}

    run_pandas = pd.read_csv(f_run, header=None, index_col=None, sep="\t")
    run_pandas.columns = ["qid", "generic", "doc_id", "rank", "score", "model"]
    run_pandas.doc_id = run_pandas.doc_id.astype(str)
    run_pandas.qid = run_pandas.qid.astype(str)
    run_pandas["rank"] = run_pandas["rank"].astype(int)
    run_pandas.score = run_pandas.score.astype(float)
    # if run_1_alt is not None:
        #     run_1_alt, run_1_alt_sub = load_jsonl(run_1_alt)
    return new_run, run_pandas


@st.cache_data
def load_jsonl(f):
    did2text = defaultdict(list)
    sub_did2text = {}

    for idx, line in enumerate(f):
        inst = json.loads(line)
        if "question" in inst:
            docid = inst["metadata"][0]["passage_id"] if "doc_id" not in inst else inst["doc_id"]
            did2text[docid].append(inst["question"])
        elif "text" in inst:
            docid = inst["doc_id"] if "doc_id" in inst else inst["did"]
            did2text[docid].append(inst["text"])
            sub_did2text[inst["did"]] = inst["text"]
        elif "query" in inst:
            docid = inst["doc_id"] if "doc_id" in inst else inst["did"]
            did2text[docid].append(inst["query"])
        else:
            breakpoint()
            raise NotImplementedError("Need to handle this case")
                
    return did2text, sub_did2text


@st.cache_data
def get_beir(dataset: str):
    url = "https://public.ukp.informatik.tu-darmstadt.de/thakur/BEIR/datasets/{}.zip".format(dataset)
    out_dir = os.path.join(pathlib.Path(__file__).parent.absolute(), "datasets")
    data_path = util.download_and_unzip(url, out_dir)
    return GenericDataLoader(data_folder=data_path).load(split="test")


@st.cache_data
def get_ir_datasets(dataset_name: str):
    dataset = ir_datasets.load(dataset_name)
    queries = {}
    for qid, query in dataset.queries_iter():
        queries[qid] = query
    # corpus = {}
    # for doc in dataset.docs_iter():
    # return corpus, queries, qrels
    return dataset.doc_store(), queries, dataset.qrels_dict()


@st.cache_data
def get_dataset(dataset_name: str):
    if dataset_name == "":
        return {}, {}, {}
    
    if dataset_name in BEIR:
        return get_beir(dataset_name)
    elif dataset_name in IR_DATASETS:
        return get_ir_datasets(dataset_name)
    elif dataset_name in LOCAL_DATASETS:
        base_path = f"local_datasets/{dataset_name}"
        corpus_file = open(f"{base_path}/corpus.jsonl", "r")
        queries_file = open(f"{base_path}/queries.jsonl", "r")
        qrels_file = open(f"{base_path}/qrels/test.tsv", "r")
        return load_local_corpus(corpus_file), load_local_queries(queries_file), load_local_qrels(qrels_file)
    else:
        raise NotImplementedError("Dataset not implemented")