from __future__ import annotations

import os
from pathlib import Path

from flask import Flask, abort, jsonify, redirect, render_template, request, send_from_directory, url_for
from werkzeug.utils import secure_filename


BASE_DIR = Path(__file__).resolve().parent
UPLOAD_DIR = Path(os.environ.get("UPLOAD_DIR", str(BASE_DIR / "uploads")))
UPLOAD_DIR.mkdir(parents=True, exist_ok=True)

ALLOWED_EXTENSIONS = {
    "mp4", "webm", "ogg", "mp3", "wav", "m4a", "jpg", "jpeg", "png", "gif",
}

app = Flask(__name__)
app.config["UPLOAD_FOLDER"] = str(UPLOAD_DIR)

# ── Player State ──────────────────────────────────────────────────────
player_state = {
    "version": 0,
    "current": None,
    "playing": False,
    "seek": 0,
    "volume": 1.0,
}


def _bump():
    player_state["version"] += 1


def _set_current(name: str, kind: str):
    player_state["current"] = {"name": name, "kind": kind}


def _clear_seek():
    player_state["seek"] = 0


def _reset_seek():
    player_state["seek"] = 0


# ── Helpers ───────────────────────────────────────────────────────────
def allowed_file(filename: str) -> bool:
    return "." in filename and filename.rsplit(".", 1)[1].lower() in ALLOWED_EXTENSIONS


def _kind_from_suffix(suffix: str) -> str:
    suffix = suffix.lower()
    if suffix in {"mp4", "webm", "ogg"}:
        return "video"
    if suffix in {"mp3", "wav", "m4a"}:
        return "audio"
    return "image"


def media_items() -> list[dict[str, str]]:
    items: list[dict[str, str]] = []
    for entry in sorted(UPLOAD_DIR.iterdir(), key=lambda p: p.name.lower()):
        if entry.is_file() and allowed_file(entry.name):
            suffix = entry.suffix.lower().lstrip(".")
            items.append({"name": entry.name, "kind": _kind_from_suffix(suffix)})
    return items


def _next_item(name: str) -> dict | None:
    items = media_items()
    for i, item in enumerate(items):
        if item["name"] == name:
            return items[(i + 1) % len(items)]
    return items[0] if items else None


def _prev_item(name: str) -> dict | None:
    items = media_items()
    for i, item in enumerate(items):
        if item["name"] == name:
            return items[(i - 1) % len(items)]
    return items[-1] if items else None


# ── Page Routes ───────────────────────────────────────────────────────
@app.route("/")
def index():
    return redirect(url_for("controller"))


@app.route("/display")
def display():
    return render_template("display.html")


@app.route("/controller")
def controller():
    return render_template("controller.html", items=media_items())


# ── Player API ────────────────────────────────────────────────────────
@app.route("/api/state")
def api_state():
    return jsonify(player_state)


@app.route("/api/play", methods=["POST"])
def api_play():
    data = request.get_json(silent=True) or {}
    name = data.get("name")
    if name:
        items = media_items()
        match = next((i for i in items if i["name"] == name), None)
        if not match:
            return jsonify({"error": "not found"}), 404
        _set_current(match["name"], match["kind"])
    _clear_seek()
    player_state["playing"] = True
    _bump()
    return jsonify(player_state)


@app.route("/api/stop", methods=["POST"])
def api_stop():
    _clear_seek()
    player_state["playing"] = False
    _bump()
    return jsonify(player_state)


@app.route("/api/next", methods=["POST"])
def api_next():
    current = player_state["current"]
    if current:
        nxt = _next_item(current["name"])
        if nxt:
            _set_current(nxt["name"], nxt["kind"])
    else:
        items = media_items()
        if items:
            _set_current(items[0]["name"], items[0]["kind"])
    _clear_seek()
    player_state["playing"] = True
    _bump()
    return jsonify(player_state)


@app.route("/api/prev", methods=["POST"])
def api_prev():
    current = player_state["current"]
    if current:
        prv = _prev_item(current["name"])
        if prv:
            _set_current(prv["name"], prv["kind"])
    else:
        items = media_items()
        if items:
            _set_current(items[-1]["name"], items[-1]["kind"])
    _clear_seek()
    player_state["playing"] = True
    _bump()
    return jsonify(player_state)


@app.route("/api/seek", methods=["POST"])
def api_seek():
    data = request.get_json(silent=True) or {}
    seconds = data.get("seconds", 0)
    player_state["seek"] = seconds
    player_state["playing"] = True
    _bump()
    return jsonify(player_state)


@app.route("/api/seek-ack", methods=["POST"])
def api_seek_ack():
    player_state["seek"] = 0
    return jsonify({"ok": True})


@app.route("/api/volume", methods=["POST"])
def api_volume():
    data = request.get_json(silent=True) or {}
    vol = float(data.get("volume", 1.0))
    vol = max(0.0, min(1.0, vol))
    player_state["volume"] = vol
    _bump()
    return jsonify(player_state)


# ── Upload / Media / Delete ───────────────────────────────────────────
@app.route("/api/media", methods=["GET"])
def api_media():
    return jsonify(media_items())


@app.route("/upload", methods=["POST"])
def upload():
    files = request.files.getlist("files")
    if not files:
        return redirect(url_for("controller"))
    for file in files:
        if not file.filename:
            continue
        if not allowed_file(file.filename):
            continue
        filename = secure_filename(file.filename)
        file.save(UPLOAD_DIR / filename)
    return redirect(url_for("controller"))


@app.route("/media/<path:filename>")
def media(filename: str):
    if not allowed_file(filename):
        abort(404)
    return send_from_directory(app.config["UPLOAD_FOLDER"], filename)


@app.route("/api/state/media", methods=["GET"])
def api_state_media():
    if player_state["current"]:
        name = player_state["current"]["name"]
        if not allowed_file(name):
            abort(404)
        return send_from_directory(app.config["UPLOAD_FOLDER"], name)
    abort(404)


@app.route("/delete/<path:filename>", methods=["POST"])
def delete(filename: str):
    if not allowed_file(filename):
        abort(404)
    path = UPLOAD_DIR / filename
    if path.exists():
        path.unlink()
    if player_state["current"] and player_state["current"]["name"] == filename:
        player_state["current"] = None
        player_state["playing"] = False
        _clear_seek()
        _bump()
    return redirect(url_for("controller"))


if __name__ == "__main__":
    app.run(
        host="0.0.0.0",
        port=int(os.environ.get("PORT", "5008")),
        debug=True,
    )