#import requests
import time
import pandas as pd
import re

from pathlib import Path
from bs4 import BeautifulSoup
from selenium import webdriver
from random import randrange

root = Path(__file__).parents[2]

"""
Download UNFCCC Biennial Update Report submissions
from Non-Annex I Parties and create list of submissions as CSV file
Based on `process_bur` from national-inventory-submissions 
(https://github.com/openclimatedata/national-inventory-submisions)
"""

# TODO for NC
## link is just /documents/XXXXX (but already dealt with in code below)
## url is https://unfccc.int/non-annex-I-NCs
## pattern needs NC instead of BUR

print("Fetching NC submissions ...")

url = "https://unfccc.int/non-annex-I-NCs"

#print(url)

# set options for headless mode
options = webdriver.firefox.options.Options()
options.add_argument('-headless')

# create profile for headless mode and automatic downloading
profile = webdriver.FirefoxProfile()

# set up selenium driver
driver = webdriver.Firefox(options=options, firefox_profile=profile)
driver.get(url)


html = BeautifulSoup(driver.page_source, "html.parser")
table = html.find_all("table")[1]
links = table.findAll("a")

targets = []  # sub-pages
downloads = []
no_downloads = []

# Check links for Zipfiles or subpages
for link in links:
    if "href" not in link.attrs:
        continue
    href = link.attrs["href"]
    if "/documents/" in href:
        if "title" in link.attrs.keys():
            title = link.attrs["title"]
        else:
            title = link.contents[0]
        if href.startswith("/documents"):
            href = "https://unfccc.int" + href
        # Only add pages in the format https://unfccc.int/documents/65587
        # to further downloads
        if str(Path(href).parent).endswith("documents"):
            targets.append({"title": title, "url": href})


pattern = re.compile(r"NC ?\d")

#skip = True
# Go through sub-pages.
for target in targets:
    #if target["url"] == "https://unfccc.int/documents/199234":
    #    skip = False
    #if skip:
    #    print(f"Skipping { target['title']}")
    #    continue
    time.sleep(randrange(5, 15))
    url = target["url"]
    #subpage = requests.get(url, timeout=15.5)
    driver.get(url)
    html = BeautifulSoup(driver.page_source, "html.parser")
    title = html.find("h1").contents[0]
    match = pattern.search(title)
    if match:
        kind = match.group(0).replace(" ", "")
    else:
        kind = None


    h2 = html.find("h2", text="Versions")
    if h2:
        div = h2.findNext("div")
        links = div.findAll("a")
        try:
            country = (
                html.find("h2", text="Countries").findNext("div").findNext("div").text
            )
        except AttributeError:
            country = (
                html.find("h2", text="Corporate Author")
                .findNext("div")
                .findNext("div")
                .text
            )
        doctype = (
            html.find("h2", text="Document Type").findNext("div").findNext("div").text
        )
        for link in links:
            url = link.attrs["href"]
            if not kind:
                match = pattern.search(url.upper())
                if match:
                    kind = match.group(0)
                else:
                    if ("NIR" in doctype) or ("NIR" in title):
                        kind = "NIR"
                    elif ("INV" in title) or ("Inventory" in title):
                        kind = "INV"
                    else:
                        print("found unknown record" + url)
            downloads.append(
                {
                    "Kind": kind,
                    "Country": country,
                    "Title": title,
                    "URL": url,
                }
            )
        print("\t".join([kind, country, title, url]))
    else:
        no_downloads.append((title, url))

if len(no_downloads) > 0:
    print("No downloads for ", no_downloads)

driver.close()
df = pd.DataFrame(downloads)
df = df[["Kind", "Country", "Title", "URL"]]
df.to_csv(root / "downloaded_data" / "UNFCCC" / "submissions-nc.csv", index=False)