import base64

import requests
from django.conf import settings as s
from django.core.exceptions import BadRequest
from django.http import HttpResponse
from django.shortcuts import redirect

from bayer.models import PESCompound
from epdb.logic import PackageManager
from epdb.models import Pathway, Node
from epdb.views import _anonymous_or_real
from utilities.decorators import package_permission_required

Package = s.GET_PACKAGE_MODEL()


@package_permission_required()
def create_pes(request, package_uuid):
    current_user = _anonymous_or_real(request)
    current_package = PackageManager.get_package_by_id(current_user, package_uuid)

    if request.method == "POST":

        if current_package.classification_level == Package.Classification.INTERNAL:
            raise BadRequest("Cannot create PESs for internal packages.")

        compound_name = request.POST.get('compound-name')
        compound_description = request.POST.get('compound-description')
        pes_link = request.POST.get('pes-link')

        if pes_link:
            try:
                pes_data = fetch_pes(request, pes_link)
            except ValueError as e:
                return BadRequest(f"Could not fetch PES data for {pes_link}")

            classification = pes_data.get("classificationLevel", "")
            if "secret" == classification.lower():
                data_pools = pes_data.get("dataPools")
                if data_pools:
                    if s.DATA_POOL_MAPPING[current_package.data_pool.name] not in data_pools:
                        return BadRequest(
                            f"PES data pool {s.DATA_POOL_MAPPING[current_package.data_pool.name]} not found in PES data")

            pes = PESCompound.create(current_package, pes_data, compound_name, compound_description)

            return redirect(pes.url)
        else:
            return BadRequest("Please provide a PES link.")
    else:
        pass


@package_permission_required()
def create_pes_node(request, package_uuid, pathway_uuid):
    current_user = _anonymous_or_real(request)
    current_package = PackageManager.get_package_by_id(current_user, package_uuid)
    current_pathway = Pathway.objects.get(package=current_package, uuid=pathway_uuid)

    if request.method == "POST":

        if current_package.classification_level == Package.Classification.INTERNAL:
            raise BadRequest("Cannot create PESs for internal packages.")

        compound_name = request.POST.get('compound-name')
        compound_description = request.POST.get('compound-description')
        pes_link = request.POST.get('pes-link')

        if pes_link:
            try:
                pes_data = fetch_pes(request, pes_link)
            except ValueError as e:
                return BadRequest(f"Could not fetch PES data for {pes_link}")

            classification = pes_data.get("classificationLevel", "")
            if "secret" == classification.lower():
                data_pools = pes_data.get("dataPools")
                if data_pools:
                    if s.DATA_POOL_MAPPING[current_package.data_pool.name] not in data_pools:
                        return BadRequest(
                            f"PES data pool {s.DATA_POOL_MAPPING[current_package.data_pool.name]} not found in PES data")

            pes = PESCompound.create(current_package, pes_data, compound_name, compound_description)

            n = Node()
            n.stereo_removed = False
            n.pathway = current_pathway
            n.depth = 0

            n.default_node_label = pes.default_structure
            n.save()

            n.node_labels.add(pes.default_structure)
            n.save()

            return redirect(current_pathway.url)

        else:
            return BadRequest("Please provide a PES link.")
    else:
        pass


def fetch_pes(request, pes_url) -> dict:
    from epauth.views import get_access_token_from_request
    token = get_access_token_from_request(request)

    if token:
        for k, v in s.PES_API_MAPPING.items():
            if pes_url.startswith(k):
                pes_id = pes_url.split('/')[-1]

                if pes_id == 'dummy':
                    import json
                    res_data = json.load(open(s.BASE_DIR / "fixtures/pes.json"))
                    res_data["pes_url"] = pes_url
                    return res_data
                else:
                    headers = {"Authorization": f"Bearer {token['access_token']}"}
                    params = {"pes_reg_entity_corporate_id": pes_id}

                    res = requests.get(v, headers=headers, params=params, proxies=s.PROXIES or None)

                    try:
                        res.raise_for_status()
                        pes_data = res.json()

                        if len(pes_data) == 0:
                            raise ValueError(f"PES with id {pes_id} not found")

                        res_data = pes_data[0]
                        res_data["pes_url"] = pes_url
                        return res_data

                    except requests.exceptions.HTTPError as e:
                        raise ValueError(f"Error fetching PES with id {pes_id}: {e}")
        else:
            raise ValueError(f"Unknown URL {pes_url}")
    else:
        raise ValueError("Could not fetch access token from request.")


def visualize_pes(request):
    pes_link = request.GET.get('pesLink')

    if pes_link:
        pes_data = fetch_pes(request, pes_link)

        representations = pes_data.get('representations')

        for rep in representations:
            if rep.get('type') == 'color':
                image_data = base64.b64decode(rep.get('base64').replace("data:image/png;base64,", ""))
                return HttpResponse(image_data, content_type="image/png")