import os
import random
import shutil
import tempfile
import time
from contextlib import contextmanager
from os import path
from subprocess import Popen

import pandas as pd
import requests

from server.common.annotations.local_file_csv import AnnotationsLocalFile
from server.common.config import DEFAULT_SERVER_PORT
from server.common.config.app_config import AppConfig
from server.common.fbs.matrix import encode_matrix_fbs
from server.common.utils.data_locator import DataLocator
from server.common.utils.utils import find_available_port
from server.data_common.matrix_loader import MatrixDataType, MatrixDataLoader
from test import PROJECT_ROOT


def data_with_tmp_annotations(ext: MatrixDataType, annotations_fixture=False):
    tmp_dir = tempfile.mkdtemp()
    annotations_file = path.join(tmp_dir, "test_annotations.csv")
    if annotations_fixture:
        shutil.copyfile(f"{PROJECT_ROOT}/test/fixtures/pbmc3k-annotations.csv", annotations_file)
    fname = {
        MatrixDataType.H5AD: f"{PROJECT_ROOT}/example-dataset/pbmc3k.h5ad",
    }[ext]
    data_locator = DataLocator(fname)
    config = AppConfig()
    config.update_server_config(
        app__flask_secret_key="secret",
        single_dataset__obs_names=None,
        single_dataset__var_names=None,
        single_dataset__datapath=data_locator.path,
    )
    config.update_dataset_config(
        embeddings__names=["umap"],
        presentation__max_categories=100,
        diffexp__lfc_cutoff=0.01,
    )

    config.complete_config()
    data = MatrixDataLoader(data_locator.abspath()).open(config)
    anno_config = {
        "user-annotations": True,
        "genesets-save": False,
    }
    annotations = AnnotationsLocalFile(anno_config, None, annotations_file, None)
    return data, tmp_dir, annotations


def make_fbs(data):
    df = pd.DataFrame(data)
    return encode_matrix_fbs(matrix=df, row_idx=None, col_idx=df.columns)


def skip_if(condition, reason: str):
    def decorator(f):
        def wraps(self, *args, **kwargs):
            if condition(self):
                self.skipTest(reason)
            else:
                f(self, *args, **kwargs)

        return wraps

    return decorator


def app_config(data_locator, backed=False, extra_server_config={}, extra_dataset_config={}):
    config = AppConfig()
    config.update_server_config(
        app__flask_secret_key="secret",
        single_dataset__obs_names=None,
        single_dataset__var_names=None,
        adaptor__anndata_adaptor__backed=backed,
        single_dataset__datapath=data_locator,
        limits__diffexp_cellcount_max=None,
        limits__column_request_max=None,
    )
    config.update_dataset_config(
        embeddings__names=["umap", "tsne", "pca"], presentation__max_categories=100, diffexp__lfc_cutoff=0.01
    )
    config.update_server_config(**extra_server_config)
    config.update_dataset_config(**extra_dataset_config)
    config.complete_config()
    return config


def start_test_server(command_line_args=[], app_config=None, env=None):
    """
    Command line arguments can be passed in, as well as an app_config.
    This function is meant to be used like this, for example:

    with unit(...) as server:
        r = requests.get(f"{server}/...")
        // check r

    where the server can be accessed within the context, and is terminated when
    the context is exited.
    The port is automatically set using find_available_port, unless passed in as a command line arg.
    The verbose flag is automatically set to True.
    If an app_config is provided, then this function writes a temporary
    yaml config file, which this server will read and parse.
    """

    command = ["cellxgene", "--no-upgrade-check", "launch", "--verbose"]
    if "-p" in command_line_args:
        port = int(command_line_args[command_line_args.index("-p") + 1])
    elif "--port" in command_line_args:
        port = int(command_line_args[command_line_args.index("--port") + 1])
    else:
        start = random.randint(DEFAULT_SERVER_PORT, 2**16 - 1)
        port = int(os.environ.get("CXG_SERVER_PORT", start))
        port = find_available_port("localhost", port)
        command += ["--port=%d" % port]

    command += command_line_args

    tempdir = None
    if app_config:
        tempdir = tempfile.TemporaryDirectory()
        config_file = os.path.join(tempdir.name, "config.yaml")
        app_config.write_config(config_file)
        command.extend(["-c", config_file])

    server = f"http://localhost:{port}"
    ps = Popen(command, env=env)

    for _ in range(10):
        try:
            requests.get(f"{server}/health")
            break
        except requests.exceptions.ConnectionError:
            time.sleep(1)

    if tempdir:
        tempdir.cleanup()

    return ps, server


def stop_test_server(ps):
    try:
        ps.terminate()
    except ProcessLookupError:
        pass


@contextmanager
def test_server(command_line_args=[], app_config=None, env=None):
    """A context to run the cellxgene server."""

    ps, server = start_test_server(command_line_args, app_config, env)
    try:
        yield server
    finally:
        try:
            stop_test_server(ps)
        except ProcessLookupError:
            pass