#!/usr/bin/python3
"""Find photos on flickr for Wikipedia articls and contact the photographer."""

import collections
import json
import sys
import typing
from urllib.parse import unquote

import flask
import requests

app = flask.Flask(__name__)
app.debug = True

enwiki = "en.wikipedia.org/wiki/"


@app.route("/")
def start() -> str:
    """Start form."""
    wikipedia_url = flask.request.args.get("wikipedia")
    if not wikipedia_url:
        return flask.render_template("combined.html")
    start = wikipedia_url.find(enwiki) + len(enwiki)
    return flask.render_template(
        "combined.html",
        name=unquote(wikipedia_url[start:]).replace("_", " "),
        wikipedia_url=wikipedia_url,
    )


def get_params(line_iter: collections.abc.Iterable[str]) -> str:
    """Find and return params from flickr profile page."""
    look_for = 'params: {"isEditingTestimonial":false,'
    return next(line[line.find("{") :] for line in line_iter if look_for in line)


def flickr_usrename_to_nsid(username: str) -> str:
    """Get NSID from flickr username."""
    url = f"https://www.flickr.com/people/{username}/"
    r = requests.get(url)
    params = json.loads(get_params(r.text.splitlines()))
    return typing.cast(str, params["nsid"])


@app.route("/message")
def show_message() -> str:
    """Show message."""
    flickr_url = flask.request.args["flickr"]
    wikipedia_url = flask.request.args["wikipedia"]

    start = wikipedia_url.find(enwiki) + len(enwiki)
    wiki_part1 = wikipedia_url[:start]

    if len(sys.argv) > 4:
        name = sys.argv[4]
    else:
        wiki_part2 = unquote(wikipedia_url[start:])
        name = wiki_part2

    if "_(" in name:
        name = name[: name.find("_(")]
    name = name.replace("_", " ")

    if "/in/" in flickr_url:
        flickr_url = flickr_url[: flickr_url.find("/in/")]

    flickr_start = "https://flickr.com/photos/"

    assert flickr_url.startswith(flickr_start)
    flickr_username = flickr_url[
        len(flickr_start) : flickr_url.find("/", len(flickr_start))
    ]

    nsid = flickr_usrename_to_nsid(flickr_username)
    assert nsid
    print(nsid)

    msg = flask.render_template(
        "message.jinja",
        flickr_url=flickr_url,
        wikipedia_url=wikipedia_url,
        name=name,
        wiki_part1=wiki_part1,
        wiki_part2=wiki_part2,
    )

    subject = f"Request to use your photo of {name} on Wikipedia"

    lines = msg.split("\n\n")

    return flask.render_template(
        "show_message.html", subject=subject, lines=lines, nsid=nsid
    )


if __name__ == "__main__":
    app.run(host="0.0.0.0")