from __future__ import annotations

import logging
import os
import time
from pathlib import Path
from typing import TYPE_CHECKING

from fastapi import APIRouter, File, Request, UploadFile
from fastapi.responses import FileResponse
from fastapi.templating import Jinja2Templates

from app.dependencies import CommonReader, CommonStats  # noqa: TCH001
from app.settings import MEDIA_ROOT

if TYPE_CHECKING:
    from collections.abc import Iterable

    from fastapi.datastructures import Address
    from reader import Feed
    from reader.types import Entry, EntrySearchResult


logger: logging.Logger = logging.getLogger(__name__)

static_router = APIRouter(tags=["HTML"])
templates = Jinja2Templates(directory="templates")


@static_router.get("/favicon.ico", summary="Favicon.", tags=["HTML"])
async def favicon(request: Request):
    """Favicon."""
    return FileResponse("static/favicon.ico")


@static_router.get(path="/", summary="Index page.", tags=["HTML"])
async def index(request: Request, reader: CommonReader, stats: CommonStats):
    """Index page."""
    feeds: Iterable[Feed] = reader.get_feeds()
    return templates.TemplateResponse(request=request, name="index.html", context={"feeds": feeds, "stats": stats})


@static_router.get(path="/feeds", summary="Feeds page.", tags=["HTML"])
async def feeds(request: Request, reader: CommonReader, stats: CommonStats):
    """Feeds page."""
    feeds: Iterable[Feed] = reader.get_feeds()
    return templates.TemplateResponse(request=request, name="feeds.html", context={"feeds": feeds, "stats": stats})


@static_router.get(path="/feed/{feed_url:path}", summary="Feed page.", tags=["HTML"])
async def feed(request: Request, feed_url: str, reader: CommonReader, stats: CommonStats):
    """Feed page."""
    feed: Feed = reader.get_feed(feed_url)
    entries: Iterable[Entry] = reader.get_entries(feed=feed.url)
    return templates.TemplateResponse(
        request=request,
        name="feed.html",
        context={"feed": feed, "entries": entries, "stats": stats},
    )


@static_router.get(path="/search", summary="Search page.", tags=["HTML"])
async def search(request: Request, q: str, reader: CommonReader, stats: CommonStats):
    """Search page."""
    # TODO(TheLovinator): We need to show the entries in the search results.  # noqa: TD003
    reader.update_search()
    entries: Iterable[EntrySearchResult] = reader.search_entries(q)
    return templates.TemplateResponse(
        request=request,
        name="search.html",
        context={"query": q, "entries": entries, "stats": stats},
    )


@static_router.post(path="/upload", summary="Upload files.", tags=["HTML"])
async def upload_files(request: Request, files: list[UploadFile] = File(...)):
    """Upload files."""
    media_root: str = os.getenv(key="MEDIA_ROOT", default=MEDIA_ROOT.as_posix())
    file_infos: list[dict[str, str]] = []
    upload_time = int(time.time())

    # Save metadata
    request_client: Address | None = request.client
    if request_client:
        host: str = request_client.host or "unknown"
    else:
        host = "unknown"

    metadata = {
        "upload_time": upload_time,
        "files": [file.filename for file in files if file.filename],
        "ip": host,
        "user_agent": request.headers.get("user-agent") or "unknown",
        "description": request.headers.get("description") or "No description.",
    }
    metadata_path: Path = Path(media_root) / f"{upload_time}.json"
    metadata_path.parent.mkdir(parents=True, exist_ok=True)
    metadata_path.write_text(str(metadata))

    # Save uploaded files
    for file in files:
        if not file:
            logger.error("No file uploaded.")
            continue

        if not file.filename:
            logger.error("No file name.")
            continue

        file_path: Path = Path(media_root) / f"{upload_time}" / file.filename

        content: bytes = b""
        while chunk := await file.read(1024):  # Read in chunks of 1024 bytes
            content += chunk

        file_path.parent.mkdir(parents=True, exist_ok=True)
        Path(file_path).write_bytes(content)

        file_infos.append({"filename": file.filename})

    return {"files_uploaded": file_infos}


@static_router.get(path="/upload", summary="Upload page.", tags=["HTML"])
async def upload_page(request: Request, stats: CommonStats):
    """Upload page."""
    return templates.TemplateResponse(request=request, name="upload.html", context={"stats": stats})


@static_router.get(path="/contact", summary="Contact page.", tags=["HTML"])
async def contact(request: Request, stats: CommonStats):
    """Contact page."""
    return templates.TemplateResponse(request=request, name="contact.html", context={"stats": stats})