from datetime import datetime
import json
import traceback

import aiofiles
import fastapi
from fastapi import Cookie, File, Form, Request, UploadFile, WebSocket, WebSocketDisconnect
from fastapi.responses import FileResponse, HTMLResponse, JSONResponse, RedirectResponse, PlainTextResponse
from fastapi.staticfiles import StaticFiles
from fastapi.templating import Jinja2Templates
from fastapi.middleware.cors import CORSMiddleware

import reporthook
import sbenv
import searchlib

MAX_SEARCH_DAYS = 180
MAX_SHOW_DAYS = 20

################################
# Core configuration
################################

app = fastapi.FastAPI(docs_url=None)

origins = [
    'https://prograde.gg',
    'http://localhost',
    'http://localhost:5000',
    'http://localhost:8080',
    'http://localhost:8000'
]

app.add_middleware(
    CORSMiddleware,
    allow_origins=origins,
    allow_credentials=True,
    allow_methods=['*'],
    allow_headers=['*']
)

app.mount('/static', StaticFiles(directory='static'), name='static')

tmplts = Jinja2Templates(directory='templates') # TODO Get the path correctly.

################################
# User-facing endpoints
################################

@app.exception_handler(Exception)
async def handle_exception(req: Request, exc: Exception):
    tb = traceback.format_exc()
    await reporthook.send_report(tb)
    return PlainTextResponse('error', status_code=500)

@app.get('/')
async def render_main(req: Request):
    raw_articles = await load_days_from_file('testresults.json')
    converted = convert_days_from_articles(raw_articles)
    num_days = calc_num_days(converted)

    p = {
        'sb': {
            'num_days': num_days,
            'days': converted
        },
        'request': req,
    }

    return tmplts.TemplateResponse('main.htm', p)

################################
# API endpoints
################################

@app.post('/api/addarticle')
async def handle_addarticle(req: Request):
    if not check_admin_token(req):
        return JSONResponse(status_code=403, content={'error': 'forbidden'})

    body = await req.json()
    add_article(body)

    return {'status': 'OK'}

def add_article(article):
    # TODO
    pass

################################
# Utilities
################################

def check_admin_token(req: Request):
    ak = sbenv.get_admin_key()
    if ak is None:
        raise RuntimeError('checked api endpoint without key loaded')

    if ak == 'UNSAFE_TESTING':
        return True

    if 'Authorization' in req.headers:
        auth = req.headers['Authorization']

        if not auth.startswith('Bearer '):
            return False

        tok = auth[len('Bearer '):]
        return tok == sbenv.get_admin_key()
    else:
        return False

async def load_days_from_file(path):
    async with aiofiles.open(path, mode='r') as f:
        contents = await f.read()
        return json.loads(contents)

def convert_days_from_articles(rarts):
    processed = searchlib.process_results(rarts)
    output = []

    for dstr, arts in processed.items():
        day = {
            'date': dstr,
            'links': [convert_article(a) for a in arts['pass']],
            'maybe_links': [convert_article(a) for a in arts['maybe']]
        }

        if len(day['links']) > 0:
            output.append(day)

        if len(output) > MAX_SHOW_DAYS:
            break

    return output

def convert_article(a):
    return {
        'url': a['url'],
        'title': a['gtitle'],
        'slug': a['slug'],
    }

DATE_FORMAT = "%Y-%m-%d"

def calc_num_days(dayslist):
    today = datetime.now()
    lowest = -1

    for d in dayslist:
        pd = datetime.strptime(d['date'], DATE_FORMAT)
        diff = today - pd
        ndays = diff.days
        if ndays < lowest or lowest == -1:
            lowest = ndays

    return lowest