# -*- coding: utf-8 -*-
# SPDX-FileCopyrightText: : 2021-2024 The PyPSA-Eur Authors
#
# SPDX-License-Identifier: MIT
"""
Build import locations for fossil gas from entry-points, LNG terminals and
production sites with data from SciGRID_gas and Global Energy Monitor.
"""

import logging

import geopandas as gpd
import pandas as pd
from _helpers import configure_logging, set_scenario_config
from cluster_gas_network import load_bus_regions

logger = logging.getLogger(__name__)


def read_scigrid_gas(fn):
    df = gpd.read_file(fn)
    df = pd.concat([df, df.param.apply(pd.Series)], axis=1)
    df.drop(["param", "uncertainty", "method"], axis=1, inplace=True)
    return df


def build_gem_lng_data(fn):
    df = pd.read_excel(fn, sheet_name="LNG terminals - data")
    df = df.set_index("ComboID")

    remove_country = ["Cyprus", "Turkey"]  # noqa: F841
    remove_terminal = [  # noqa: F841
        "Puerto de la Luz LNG Terminal",
        "Gran Canaria LNG Terminal",
    ]

    df = df.query(
        "Status != 'Cancelled' \
              & Country != @remove_country \
              & TerminalName != @remove_terminal \
              & CapacityInMtpa != '--'"
    )

    geometry = gpd.points_from_xy(df["Longitude"], df["Latitude"])
    return gpd.GeoDataFrame(df, geometry=geometry, crs="EPSG:4326")


def build_gem_prod_data(fn):
    df = pd.read_excel(fn, sheet_name="Gas extraction - main")
    df = df.set_index("GEM Unit ID")

    remove_country = ["Cyprus", "Türkiye"]  # noqa: F841
    remove_fuel_type = ["oil"]  # noqa: F841

    df = df.query(
        "Status != 'shut in' \
              & 'Fuel type' != 'oil' \
              & Country != @remove_country \
              & ~Latitude.isna() \
              & ~Longitude.isna()"
    ).copy()

    p = pd.read_excel(fn, sheet_name="Gas extraction - production")
    p = p.set_index("GEM Unit ID")
    p = p[p["Fuel description"] == "gas"]

    capacities = pd.DataFrame(index=df.index)
    for key in ["production", "production design capacity", "reserves"]:
        cap = (
            p.loc[p["Production/reserves"] == key, "Quantity (converted)"]
            .groupby("GEM Unit ID")
            .sum()
            .reindex(df.index)
        )
        # assume capacity such that 3% of reserves can be extracted per year (25% quantile)
        annualization_factor = 0.03 if key == "reserves" else 1.0
        capacities[key] = cap * annualization_factor

    df["mcm_per_year"] = (
        capacities["production"]
        .combine_first(capacities["production design capacity"])
        .combine_first(capacities["reserves"])
    )

    geometry = gpd.points_from_xy(df["Longitude"], df["Latitude"])
    return gpd.GeoDataFrame(df, geometry=geometry, crs="EPSG:4326")


def build_gas_input_locations(gem_fn, entry_fn, sto_fn, countries):
    # LNG terminals
    lng = build_gem_lng_data(gem_fn)

    # Entry points from outside the model scope
    entry = read_scigrid_gas(entry_fn)
    entry["from_country"] = entry.from_country.str.rstrip()
    entry = entry.loc[
        ~(entry.from_country.isin(countries) & entry.to_country.isin(countries))
        & ~entry.name.str.contains("Tegelen")  # only take non-EU entries
        | (entry.from_country == "NO")  # malformed datapoint  # entries from NO to GB
    ]

    sto = read_scigrid_gas(sto_fn)
    remove_country = ["RU", "UA", "TR", "BY"]  # noqa: F841
    sto = sto.query("country_code not in @remove_country")

    # production sites inside the model scope
    prod = build_gem_prod_data(gem_fn)

    mcm_per_day_to_mw = 437.5  # MCM/day to MWh/h
    mcm_per_year_to_mw = 1.199  #  MCM/year to MWh/h
    mtpa_to_mw = 1649.224  # mtpa to MWh/h
    mcm_to_gwh = 11.36  # MCM to GWh
    lng["capacity"] = lng["CapacityInMtpa"] * mtpa_to_mw
    entry["capacity"] = entry["max_cap_from_to_M_m3_per_d"] * mcm_per_day_to_mw
    prod["capacity"] = prod["mcm_per_year"] * mcm_per_year_to_mw
    sto["capacity"] = sto["max_cushionGas_M_m3"] * mcm_to_gwh

    lng["type"] = "lng"
    entry["type"] = "pipeline"
    prod["type"] = "production"
    sto["type"] = "storage"

    sel = ["geometry", "capacity", "type"]

    return pd.concat([prod[sel], entry[sel], lng[sel], sto[sel]], ignore_index=True)


if __name__ == "__main__":
    if "snakemake" not in globals():
        from _helpers import mock_snakemake

        snakemake = mock_snakemake(
            "build_gas_input_locations",
            simpl="",
            clusters="128",
        )

    configure_logging(snakemake)
    set_scenario_config(snakemake)

    regions = load_bus_regions(
        snakemake.input.regions_onshore, snakemake.input.regions_offshore
    )

    # add a buffer to eastern countries because some
    # entry points are still in Russian or Ukrainian territory.
    buffer = 9000  # meters
    eastern_countries = ["FI", "EE", "LT", "LV", "PL", "SK", "HU", "RO"]
    add_buffer_b = regions.index.str[:2].isin(eastern_countries)
    regions.loc[add_buffer_b] = (
        regions[add_buffer_b].to_crs(3035).buffer(buffer).to_crs(4326)
    )

    countries = regions.index.str[:2].unique().str.replace("GB", "UK")

    gas_input_locations = build_gas_input_locations(
        snakemake.input.gem,
        snakemake.input.entry,
        snakemake.input.storage,
        countries,
    )

    gas_input_nodes = gpd.sjoin(gas_input_locations, regions, how="left")

    gas_input_nodes.rename(columns={"index_right": "bus"}, inplace=True)

    gas_input_nodes.to_file(snakemake.output.gas_input_nodes, driver="GeoJSON")

    ensure_columns = ["lng", "pipeline", "production", "storage"]
    gas_input_nodes_s = (
        gas_input_nodes.groupby(["bus", "type"])["capacity"]
        .sum()
        .unstack()
        .reindex(columns=ensure_columns)
    )
    gas_input_nodes_s.columns.name = "capacity"

    gas_input_nodes_s.to_csv(snakemake.output.gas_input_nodes_simplified)
