import json
import os
from datetime import datetime, timezone, timedelta
from dateutil import parser as dateparser

import meilisearch
from fasthtml.common import *
from markdown import markdown
from dotenv import load_dotenv
from apscheduler.schedulers.background import BackgroundScheduler
from apscheduler.triggers.cron import CronTrigger
from contextlib import asynccontextmanager

from constants import MeilisearchIndexFields
from update import process_webhook, update_webhooks

loaded = load_dotenv("./.env", override=True)
print("Loaded .env file:", loaded)

MS_URL = os.getenv("MS_URL")
MS_SEARCH_KEY = os.getenv("MS_SEARCH_KEY")
ms_client = meilisearch.Client(MS_URL, MS_SEARCH_KEY)

css_content = open("styles.css").read()


@asynccontextmanager
async def lifespan(app):
    # Setup
    scheduler = BackgroundScheduler()
    scheduler.add_job(update_webhooks, CronTrigger.from_crontab("0 */3 * * *"))
    scheduler.start()

    yield

    # Cleanup
    scheduler.shutdown()


app, rt = fast_app(hdrs=(Style(css_content),), lifespan=lifespan)


md_exts = "codehilite", "smarty", "extra", "sane_lists"


def Markdown(s, exts=md_exts, **kw):
    return Div(NotStr(markdown(s, extensions=exts)), **kw)


scroll_script = Script(
    """
document.addEventListener('DOMContentLoaded', function() {
    var scrollButton = document.getElementById('scroll-top-btn');
    
    window.onscroll = function() {
        if (document.body.scrollTop > 20 || document.documentElement.scrollTop > 20) {
            scrollButton.style.display = "block";
        } else {
            scrollButton.style.display = "none";
        }
    };

    scrollButton.onclick = function() {
        document.body.scrollTop = 0; // For Safari
        document.documentElement.scrollTop = 0; // For Chrome, Firefox, IE and Opera
    };
});
"""
)


def date_range_inputs(start_date, end_date):
    return Div(
        Input(
            type="date",
            name="start_date",
            value=start_date.strftime("%Y-%m-%d"),
            title="Start date",
        ),
        Input(
            type="date",
            name="end_date",
            value=end_date.strftime("%Y-%m-%d"),
            title="End date",
        ),
        cls="date-range",
    )


def search_form(start_date, end_date):
    return Form(
        Input(type="text", name="query", placeholder="Enter search query"),
        date_range_inputs(start_date, end_date),
        Button("Search", type="submit"),
        hx_post="/search",
        hx_target="#search-results",
        hx_trigger="submit",
        id="search-form",
    )


def iso_to_unix_timestamp(iso_string):
    dt = dateparser.isoparse(iso_string)
    return int(dt.timestamp())


def unix_timestamp_to_nice_format(timestamp):
    dt = datetime.fromtimestamp(timestamp, tz=timezone.utc)
    return dt.strftime("%b %d, %Y at %H:%M UTC")


def make_query(query, start_date, end_date, page=1, limit=10):

    twenty_three_hours_59_minutes_59_seconds_in_seconds = (23 * 60 + 59) * 60 + 59

    after_timestamp = iso_to_unix_timestamp(start_date)
    before_timestamp = (
        iso_to_unix_timestamp(end_date)
        + twenty_three_hours_59_minutes_59_seconds_in_seconds
    )

    options = {
        "limit": limit,
        "offset": (page - 1) * limit,
        "filter": f"{MeilisearchIndexFields.UPDATED_AT.value} >= {after_timestamp} AND {MeilisearchIndexFields.UPDATED_AT.value} < {before_timestamp}",
        "attributesToCrop": [MeilisearchIndexFields.CONTENT.value],
        "cropLength": 30,
        "attributesToHighlight": [
            MeilisearchIndexFields.CONTENT.value,
            MeilisearchIndexFields.TITLE.value,
        ],
        "highlightPreTag": '<span class="highlight">',
        "highlightPostTag": "</span>",
        "distinct": MeilisearchIndexFields.URL.value,
    }

    return ms_client.index(MeilisearchIndexFields.INDEX_NAME.value).search(
        query=query, opt_params=options
    )


def search_results(query, start_date, end_date, page=1):
    raw_results = make_query(query, start_date, end_date, page)

    return Div(
        make_results_bar(raw_results),
        Div(*[make_card(r) for r in raw_results["hits"]]),
        make_pagination(page, raw_results["estimatedTotalHits"]),
        id="search-results",
    )


def make_results_bar(results):
    processing_time = results["processingTimeMs"]
    estimated_hits = results["estimatedTotalHits"]
    return Div(
        Div(f"Processing time: {processing_time}ms"),
        Div(f"Estimated total hits: {estimated_hits}"),
        cls="results-bar",
    )


def make_card(result):
    result = result["_formatted"]

    url = result[MeilisearchIndexFields.URL.value]
    date = unix_timestamp_to_nice_format(
        int(result[MeilisearchIndexFields.UPDATED_AT.value])
    )

    return Div(
        Div(
            Strong(NotStr(result[MeilisearchIndexFields.TITLE.value])),
            P(NotStr(result[MeilisearchIndexFields.CONTENT.value]), cls="comment-text"),
            Div(Span(date)),
            A(url, href=url, target="_blank"),
        ),
        cls="card-item",
    )


def make_pagination(current_page, total_hits, limit=10):
    total_pages = -(-total_hits // limit)  # Ceiling division

    children = []

    if current_page > 1:
        children.append(
            Button(
                "Previous",
                hx_post=f"/search?page={current_page-1}",
                hx_target="#search-results",
                hx_include="[name='query'], [name='start_date'], [name='end_date']",
            )
        )

    children.append(Span(f"Page {current_page} of {total_pages}"))

    if current_page < total_pages:
        children.append(
            Button(
                "Next",
                hx_post=f"/search?page={current_page+1}",
                hx_target="#search-results",
                hx_include="[name='query'], [name='start_date'], [name='end_date']",
            )
        )

    return Div(*children, cls="pagination")


scroll_button = Button(
    "Scroll to Top",
    id="scroll-top-btn",
    style="""
        position: fixed; 
        bottom: 20px; 
        right: 20px; 
        display: none;
        background-color: #007bff;
        color: white;
        border: none;
        border-radius: 5px;
        padding: 10px 15px;
        cursor: pointer;
    """,
)


@rt("/")
def get():
    end_date = datetime.now()
    start_date = end_date - timedelta(days=7)
    return Titled(
        "HF Discussion Search",
        Div(
            search_form(start_date, end_date),
            Div(id="search-results"),
            scroll_button,
            scroll_script,
            cls="container",
        ),
    )


@rt("/search")
def post(query: str, start_date: str, end_date: str, page: int = 1):
    return search_results(query, start_date, end_date, page)


@app.post("/webhook")
async def hf_webhook(request):
    return await process_webhook(request)


serve()