"""
E-Ink Photo Frame Server

Serves photos for the ESP32 photo frame and provides a web UI for management.
Photos come from pluggable provider backends (local directory, SFTP, cloud, etc).
Tracks frame status via heartbeat reports from the ESP32.
"""

import argparse
import io
import json
import sys
from datetime import datetime, timezone
from pathlib import Path

from flask import Flask, Response, jsonify, request, render_template_string
from werkzeug.utils import secure_filename

from PIL import Image

from dither import dither_floyd_steinberg
from providers import (
    ProviderManager, available_provider_types, migrate_image_settings,
)
# Import providers to trigger registration
import providers.local  # noqa: F401

app = Flask(__name__)

PHYSICAL_WIDTH = 800
PHYSICAL_HEIGHT = 480

DATA_DIR = Path("/data")
STATE_FILE = DATA_DIR / "frame_state.json"
SETTINGS_FILE = DATA_DIR / "settings.json"
IMAGE_SETTINGS_FILE = DATA_DIR / "image_settings.json"

# --- Persistence helpers ---

def _load_json(path: Path, default):
    try:
        if path.exists():
            return json.loads(path.read_text())
    except Exception:
        pass
    return default() if callable(default) else default

def _save_json(path: Path, data):
    try:
        path.parent.mkdir(parents=True, exist_ok=True)
        path.write_text(json.dumps(data, indent=2))
    except Exception as e:
        print(f"Warning: could not save {path}: {e}", file=sys.stderr)

# Frame state (runtime, updated by heartbeats)
frame_state = _load_json(STATE_FILE, lambda: {
    "last_update": None, "current_photo": None, "ip": None, "updates": 0
})

# Frame settings (user-configured)
DEFAULT_SETTINGS = {
    "orientation": "landscape",
    "default_mode": "zoom",
    "letterbox_color": [255, 255, 255],
}

frame_settings = _load_json(SETTINGS_FILE, lambda: dict(DEFAULT_SETTINGS))

# Per-image settings keyed by composite key: "provider_id:photo_id"
image_settings: dict = _load_json(IMAGE_SETTINGS_FILE, dict)

# Provider manager — initialized in main
provider_manager: ProviderManager = None  # type: ignore


def _parse_photo_key(photo_key: str) -> tuple[str, str]:
    """Parse a composite key into (provider_id, photo_id)."""
    if ":" not in photo_key:
        # Legacy bare filename — assume local-default
        return "local-default", photo_key
    return photo_key.split(":", 1)


def get_image_settings(composite_key: str) -> dict:
    """Get effective settings for an image (per-image overrides merged with defaults)."""
    defaults = {"mode": None, "pan_x": 0.5, "pan_y": 0.5}
    per_image = image_settings.get(composite_key, {})
    merged = {**defaults, **per_image}
    if merged["mode"] is None:
        merged["mode"] = frame_settings.get("default_mode", "zoom")
    return merged


# --- Image processing (unchanged — operates on PIL Images) ---

def get_logical_dimensions() -> tuple[int, int]:
    orientation = frame_settings.get("orientation", "landscape")
    if orientation == "landscape":
        return PHYSICAL_WIDTH, PHYSICAL_HEIGHT
    else:
        return PHYSICAL_HEIGHT, PHYSICAL_WIDTH


def process_image(img: Image.Image, settings: dict) -> Image.Image:
    logical_w, logical_h = get_logical_dimensions()
    mode = settings.get("mode", "zoom")
    pan_x = settings.get("pan_x", 0.5)
    pan_y = settings.get("pan_y", 0.5)

    if mode == "zoom":
        img = _zoom_and_pan(img, logical_w, logical_h, pan_x, pan_y)
    else:
        img = _letterbox(img, logical_w, logical_h)

    orientation = frame_settings.get("orientation", "landscape")
    if orientation == "portrait_cw":
        img = img.rotate(-90, expand=True)
    elif orientation == "portrait_ccw":
        img = img.rotate(90, expand=True)

    return img


def _zoom_and_pan(img: Image.Image, tw: int, th: int,
                  pan_x: float, pan_y: float) -> Image.Image:
    target_ratio = tw / th
    img_ratio = img.width / img.height

    if img_ratio > target_ratio:
        new_height = th
        new_width = int(img.width * (th / img.height))
    else:
        new_width = tw
        new_height = int(img.height * (tw / img.width))

    img = img.resize((new_width, new_height), Image.LANCZOS)

    max_left = new_width - tw
    max_top = new_height - th
    left = int(max_left * pan_x)
    top = int(max_top * pan_y)
    return img.crop((left, top, left + tw, top + th))


def _letterbox(img: Image.Image, tw: int, th: int) -> Image.Image:
    lb_color = tuple(frame_settings.get("letterbox_color", [255, 255, 255]))
    target_ratio = tw / th
    img_ratio = img.width / img.height

    if img_ratio > target_ratio:
        new_width = tw
        new_height = int(img.height * (tw / img.width))
    else:
        new_height = th
        new_width = int(img.width * (th / img.height))

    img = img.resize((new_width, new_height), Image.LANCZOS)

    canvas = Image.new("RGB", (tw, th), lb_color)
    paste_x = (tw - new_width) // 2
    paste_y = (th - new_height) // 2
    canvas.paste(img, (paste_x, paste_y))
    return canvas


# --- ESP32 endpoints ---

@app.route("/photo")
def random_photo():
    ref = provider_manager.pick_random_photo()
    if not ref:
        return jsonify({"error": "No photos found"}), 404
    try:
        img = provider_manager.get_photo_image(ref)
        settings = get_image_settings(ref.composite_key)
        img = process_image(img, settings)

        buf = io.BytesIO()
        img.save(buf, format="JPEG", quality=85)
        buf.seek(0)

        return Response(buf.getvalue(), mimetype="image/jpeg",
                        headers={"X-Photo-Name": ref.composite_key})
    except Exception as e:
        print(f"Error processing {ref.composite_key}: {e}", file=sys.stderr)
        return jsonify({"error": str(e)}), 500


@app.route("/heartbeat", methods=["POST"])
def heartbeat():
    global frame_state
    data = request.get_json(silent=True) or {}
    frame_state["last_update"] = datetime.now(timezone.utc).isoformat()
    frame_state["current_photo"] = data.get("photo", None)
    frame_state["ip"] = request.remote_addr
    frame_state["free_heap"] = data.get("free_heap", None)
    frame_state["updates"] = frame_state.get("updates", 0) + 1
    _save_json(STATE_FILE, frame_state)
    return jsonify({"ok": True})


# --- Frame settings API ---

@app.route("/api/settings", methods=["GET"])
def api_get_settings():
    return jsonify(frame_settings)

@app.route("/api/settings", methods=["PUT"])
def api_put_settings():
    global frame_settings
    data = request.get_json()
    allowed_keys = {"orientation", "default_mode", "letterbox_color"}
    for k, v in data.items():
        if k in allowed_keys:
            frame_settings[k] = v
    _save_json(SETTINGS_FILE, frame_settings)
    return jsonify(frame_settings)


# --- Per-image settings API (uses composite keys) ---

@app.route("/api/photos/<path:photo_key>/settings", methods=["GET"])
def api_get_image_settings(photo_key: str):
    return jsonify(get_image_settings(photo_key))

@app.route("/api/photos/<path:photo_key>/settings", methods=["PUT"])
def api_put_image_settings(photo_key: str):
    data = request.get_json()
    allowed_keys = {"mode", "pan_x", "pan_y"}
    current = image_settings.get(photo_key, {})
    for k, v in data.items():
        if k in allowed_keys:
            current[k] = v
    image_settings[photo_key] = current
    _save_json(IMAGE_SETTINGS_FILE, image_settings)
    return jsonify(get_image_settings(photo_key))

@app.route("/api/photos/<path:photo_key>/settings", methods=["DELETE"])
def api_delete_image_settings(photo_key: str):
    image_settings.pop(photo_key, None)
    _save_json(IMAGE_SETTINGS_FILE, image_settings)
    return jsonify(get_image_settings(photo_key))


# --- Provider management API ---

@app.route("/api/providers/types")
def api_provider_types():
    return jsonify(available_provider_types())

@app.route("/api/providers", methods=["GET"])
def api_list_providers():
    result = []
    for iid, cfg in provider_manager.all_configs().items():
        entry = {"id": iid, **cfg}
        provider = provider_manager.get_instance(iid)
        if provider:
            entry["health"] = provider.health_check().__dict__
        else:
            entry["health"] = {"status": "disabled"}
        result.append(entry)
    return jsonify(result)

@app.route("/api/providers", methods=["POST"])
def api_add_provider():
    data = request.get_json()
    iid = data.get("id", "").strip()
    ptype = data.get("type", "")
    config = data.get("config", {})
    if not iid or not ptype:
        return jsonify({"error": "id and type are required"}), 400
    try:
        provider_manager.add_provider(iid, ptype, config)
        return jsonify({"id": iid, "status": "created"})
    except ValueError as e:
        return jsonify({"error": str(e)}), 400

@app.route("/api/providers/<provider_id>", methods=["GET"])
def api_get_provider(provider_id: str):
    configs = provider_manager.all_configs()
    if provider_id not in configs:
        return jsonify({"error": "not found"}), 404
    entry = {"id": provider_id, **configs[provider_id]}
    provider = provider_manager.get_instance(provider_id)
    if provider:
        entry["health"] = provider.health_check().__dict__
    return jsonify(entry)

@app.route("/api/providers/<provider_id>", methods=["PUT"])
def api_update_provider(provider_id: str):
    data = request.get_json()
    try:
        if "config" in data:
            provider_manager.update_provider_config(provider_id, data["config"])
        if "enabled" in data:
            provider_manager.set_enabled(provider_id, data["enabled"])
        return jsonify({"id": provider_id, "status": "updated"})
    except ValueError as e:
        return jsonify({"error": str(e)}), 400

@app.route("/api/providers/<provider_id>", methods=["DELETE"])
def api_delete_provider(provider_id: str):
    provider_manager.remove_provider(provider_id)
    return jsonify({"id": provider_id, "status": "removed"})

@app.route("/api/providers/<provider_id>/cache/clear", methods=["POST"])
def api_clear_provider_cache(provider_id: str):
    provider_manager.cache.clear(provider_id)
    return jsonify({"status": "cleared"})

# Auth flow endpoints
@app.route("/api/providers/<provider_id>/auth/start", methods=["POST"])
def api_auth_start(provider_id: str):
    provider = provider_manager.get_instance(provider_id)
    if not provider:
        return jsonify({"error": "not found"}), 404
    callback_url = request.json.get("callback_url", "") if request.json else ""
    return jsonify(provider.auth_start(callback_url))

@app.route("/api/providers/<provider_id>/auth/callback")
def api_auth_callback(provider_id: str):
    provider = provider_manager.get_instance(provider_id)
    if not provider:
        return jsonify({"error": "not found"}), 404
    result = provider.auth_callback(dict(request.args))
    if "config" in result:
        provider_manager.save_provider_auth_state(provider_id, result.pop("config"))
    return jsonify(result)

@app.route("/api/providers/<provider_id>/auth/code", methods=["POST"])
def api_auth_code(provider_id: str):
    provider = provider_manager.get_instance(provider_id)
    if not provider:
        return jsonify({"error": "not found"}), 404
    code = request.json.get("code", "") if request.json else ""
    return jsonify(provider.auth_submit_code(code))

@app.route("/api/providers/<provider_id>/auth/status")
def api_auth_status(provider_id: str):
    provider = provider_manager.get_instance(provider_id)
    if not provider:
        return jsonify({"error": "not found"}), 404
    return jsonify(provider.get_auth_state())


# --- Photo API endpoints ---

@app.route("/api/status")
def api_status():
    all_photos = provider_manager.get_all_photos()
    return jsonify({
        "state": "online" if frame_state.get("last_update") else "waiting",
        "last_update": frame_state.get("last_update"),
        "current_photo": frame_state.get("current_photo"),
        "frame_ip": frame_state.get("ip"),
        "total_photos": len(all_photos),
        "total_updates": frame_state.get("updates", 0),
        "orientation": frame_settings.get("orientation", "landscape"),
    })


@app.route("/api/photos")
def api_photos():
    all_photos = provider_manager.get_all_photos()
    result = []
    for ref in all_photos:
        entry = {
            "key": ref.composite_key,
            "name": ref.display_name,
            "provider": ref.provider_id,
        }
        provider = provider_manager.get_instance(ref.provider_id)
        if provider:
            size = provider.get_photo_size(ref.photo_id)
            if size is not None:
                entry["size"] = size
        if ref.composite_key in image_settings:
            entry["settings"] = image_settings[ref.composite_key]
        result.append(entry)
    return jsonify(result)


@app.route("/api/upload", methods=["POST"])
def api_upload():
    target_id = request.args.get("provider", None)

    # Find a provider that supports upload
    provider = None
    if target_id:
        provider = provider_manager.get_instance(target_id)
    else:
        for p in provider_manager.all_instances().values():
            if p.supports_upload():
                provider = p
                break

    if not provider or not provider.supports_upload():
        return jsonify({"error": "No upload-capable provider found"}), 400

    uploaded = []
    for f in request.files.getlist("photos"):
        if not f.filename:
            continue
        fname = secure_filename(f.filename)
        try:
            ref = provider.upload_photo(fname, f.read())
            uploaded.append(ref.composite_key)
        except Exception as e:
            print(f"Upload error for {fname}: {e}", file=sys.stderr)

    # Invalidate the provider's photo list cache
    provider_manager.cache.invalidate_list(provider.instance_id)
    return jsonify({"uploaded": uploaded, "count": len(uploaded)})


@app.route("/api/photos/<path:photo_key>", methods=["DELETE"])
def api_delete(photo_key: str):
    provider_id, photo_id = _parse_photo_key(photo_key)
    provider = provider_manager.get_instance(provider_id)
    if not provider:
        return jsonify({"error": "provider not found"}), 404
    if not provider.supports_delete():
        return jsonify({"error": "provider does not support deletion"}), 400
    try:
        provider.delete_photo(photo_id)
    except FileNotFoundError:
        return jsonify({"error": "not found"}), 404
    image_settings.pop(photo_key, None)
    _save_json(IMAGE_SETTINGS_FILE, image_settings)
    provider_manager.cache.invalidate_list(provider_id)
    return jsonify({"deleted": photo_key})


@app.route("/thumb/<path:photo_key>")
def thumbnail(photo_key: str):
    ref = provider_manager.find_photo_ref(photo_key)
    if not ref:
        return "", 404
    try:
        size = request.args.get("size", 300, type=int)
        size = min(size, 1600)
        data = provider_manager.get_photo_thumbnail(ref, size)
        return Response(data, mimetype="image/jpeg")
    except Exception:
        return "", 500


# --- Simulator / Preview ---

@app.route("/preview/<path:photo_key>")
def preview_photo(photo_key: str):
    ref = provider_manager.find_photo_ref(photo_key)
    if not ref:
        return jsonify({"error": "not found"}), 404

    settings = get_image_settings(ref.composite_key)
    if "mode" in request.args:
        settings["mode"] = request.args["mode"]
    if "pan_x" in request.args:
        settings["pan_x"] = float(request.args["pan_x"])
    if "pan_y" in request.args:
        settings["pan_y"] = float(request.args["pan_y"])

    try:
        img = provider_manager.get_photo_image(ref)
        img = process_image(img, settings)
        _, preview = dither_floyd_steinberg(img)
        buf = io.BytesIO()
        preview.save(buf, format="PNG")
        buf.seek(0)
        return Response(buf.getvalue(), mimetype="image/png")
    except Exception as e:
        print(f"Preview error: {e}", file=sys.stderr)
        return jsonify({"error": str(e)}), 500


@app.route("/preview")
def preview_random():
    ref = provider_manager.pick_random_photo()
    if not ref:
        return jsonify({"error": "No photos found"}), 404
    return preview_photo(ref.composite_key)


@app.route("/api/photos/<path:photo_key>/geometry")
def photo_geometry(photo_key: str):
    ref = provider_manager.find_photo_ref(photo_key)
    if not ref:
        return jsonify({"error": "not found"}), 404
    img = provider_manager.get_photo_image(ref)
    lw, lh = get_logical_dimensions()
    return jsonify({
        "source_width": img.width,
        "source_height": img.height,
        "logical_width": lw,
        "logical_height": lh,
        "logical_aspect": lw / lh,
    })


@app.route("/simulate/<path:photo_key>")
def simulate_page(photo_key: str):
    ref = provider_manager.find_photo_ref(photo_key)
    if not ref:
        return "", 404
    settings = get_image_settings(ref.composite_key)
    orientation = frame_settings.get("orientation", "landscape")
    lw, lh = get_logical_dimensions()
    return render_template_string(SIMULATE_UI, photo_key=ref.composite_key,
                                  photo_name=ref.display_name,
                                  settings=settings, orientation=orientation,
                                  logical_w=lw, logical_h=lh)


SIMULATE_UI = """<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>{{ photo_name }} — Frame Preview</title>
<style>
  :root { --bg: #111; --card: #1a1a1a; --border: #333; --accent: #6c8; --dim: rgba(0,0,0,0.55); }
  * { box-sizing: border-box; margin: 0; padding: 0; }
  body { background: var(--bg); color: #eee; font-family: -apple-system, system-ui, sans-serif; }
  .top-bar {
    display: flex; align-items: center; gap: 1rem; padding: 0.75rem 1.25rem;
    background: var(--card); border-bottom: 1px solid var(--border);
  }
  .top-bar a { color: var(--accent); text-decoration: none; font-size: 0.9rem; }
  .top-bar .title { font-size: 0.95rem; color: #aaa; flex: 1; }
  .mode-toggle { display: flex; border: 1px solid var(--border); border-radius: 4px; overflow: hidden; }
  .mode-toggle button {
    background: #222; color: #aaa; border: none; padding: 0.35rem 0.9rem;
    font-size: 0.8rem; cursor: pointer; transition: all 0.15s;
  }
  .mode-toggle button.active { background: var(--accent); color: #111; }
  .mode-toggle button:not(:last-child) { border-right: 1px solid var(--border); }
  .save-btn {
    background: var(--accent); color: #111; border: none; padding: 0.35rem 0.9rem;
    border-radius: 4px; font-size: 0.8rem; cursor: pointer; font-weight: 600;
  }
  .save-btn:hover { opacity: 0.9; }
  .save-btn.saved { background: #555; color: #aaa; }
  .workspace { display: flex; height: calc(100vh - 50px); }
  .crop-panel {
    flex: 1; display: flex; align-items: center; justify-content: center;
    overflow: hidden; position: relative; background: #0a0a0a;
  }
  .crop-container { position: relative; display: inline-block; user-select: none; -webkit-user-select: none; }
  .crop-container img { display: block; max-width: 100%; max-height: calc(100vh - 50px); }
  .dim { position: absolute; background: var(--dim); pointer-events: none; transition: all 0.05s; }
  .crop-window {
    position: absolute; border: 2px solid rgba(255,255,255,0.8);
    box-shadow: 0 0 0 1px rgba(0,0,0,0.5), inset 0 0 0 1px rgba(0,0,0,0.2);
    cursor: grab; transition: box-shadow 0.15s;
  }
  .crop-window:active { cursor: grabbing; box-shadow: 0 0 0 2px var(--accent), inset 0 0 0 1px rgba(0,0,0,0.2); }
  .crop-window.letterbox { border-style: dashed; border-color: rgba(255,255,255,0.4); cursor: default; }
  .preview-panel {
    width: 420px; min-width: 320px; background: var(--card);
    border-left: 1px solid var(--border);
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    padding: 1.5rem; gap: 1rem;
  }
  .preview-label { font-size: 0.7rem; text-transform: uppercase; color: #666; letter-spacing: 0.08em; }
  .epaper-frame {
    background: #e8e4d9; border-radius: 3px; padding: 8px;
    box-shadow: 0 2px 16px rgba(0,0,0,0.4), inset 0 0 0 1px rgba(0,0,0,0.08);
  }
  .epaper-frame img { display: block; width: 100%; height: auto; }
  .rendering { color: #666; font-size: 0.8rem; }
  @media (max-width: 800px) {
    .workspace { flex-direction: column; height: auto; }
    .crop-panel { min-height: 50vh; }
    .preview-panel { width: 100%; border-left: none; border-top: 1px solid var(--border); }
  }
</style>
</head>
<body>
<div class="top-bar">
  <a href="/">&larr; Gallery</a>
  <span class="title">{{ photo_name }}</span>
  <div class="mode-toggle">
    <button id="btn-zoom" onclick="setMode('zoom')">Fill</button>
    <button id="btn-letterbox" onclick="setMode('letterbox')">Fit</button>
  </div>
  <button class="save-btn" id="save-btn" onclick="save()">Save</button>
</div>
<div class="workspace">
  <div class="crop-panel" id="crop-panel">
    <div class="crop-container" id="crop-container">
      <img id="source-img" src="/thumb/{{ photo_key }}?size=1600" draggable="false">
      <div class="dim" id="dim-top"></div>
      <div class="dim" id="dim-bottom"></div>
      <div class="dim" id="dim-left"></div>
      <div class="dim" id="dim-right"></div>
      <div class="crop-window" id="crop-window"></div>
    </div>
  </div>
  <div class="preview-panel">
    <span class="preview-label">E-Paper Preview</span>
    <div class="epaper-frame">
      <img id="preview-img" src="/preview/{{ photo_key }}">
    </div>
    <span class="rendering" id="rendering" style="visibility:hidden">Rendering...</span>
  </div>
</div>
<script>
const photoKey = {{ photo_key | tojson }};
const logicalW = {{ logical_w }};
const logicalH = {{ logical_h }};
const displayAspect = logicalW / logicalH;
let mode = {{ settings.mode | tojson }};
let panX = {{ settings.pan_x }};
let panY = {{ settings.pan_y }};
let dirty = false;
const sourceImg = document.getElementById('source-img');
const cropWindow = document.getElementById('crop-window');
const previewImg = document.getElementById('preview-img');
const renderingLabel = document.getElementById('rendering');
const saveBtn = document.getElementById('save-btn');
const dims = {
  top: document.getElementById('dim-top'), bottom: document.getElementById('dim-bottom'),
  left: document.getElementById('dim-left'), right: document.getElementById('dim-right'),
};
sourceImg.onload = () => { updateMode(); layoutCrop(); };
if (sourceImg.complete) { updateMode(); layoutCrop(); }
function updateMode() {
  document.getElementById('btn-zoom').classList.toggle('active', mode === 'zoom');
  document.getElementById('btn-letterbox').classList.toggle('active', mode === 'letterbox');
  cropWindow.classList.toggle('letterbox', mode === 'letterbox');
}
function setMode(m) { mode = m; dirty = true; updateMode(); layoutCrop(); schedulePreview(); }
function layoutCrop() {
  const imgW = sourceImg.clientWidth, imgH = sourceImg.clientHeight;
  if (!imgW || !imgH) return;
  let cropW, cropH;
  if (mode === 'letterbox') { cropW = imgW; cropH = imgH; panX = 0; panY = 0; }
  else {
    const imgAspect = imgW / imgH;
    if (displayAspect > imgAspect) { cropW = imgW; cropH = imgW / displayAspect; }
    else { cropH = imgH; cropW = imgH * displayAspect; }
  }
  const maxLeft = imgW - cropW, maxTop = imgH - cropH;
  const left = maxLeft * panX, top = maxTop * panY;
  cropWindow.style.width = cropW + 'px'; cropWindow.style.height = cropH + 'px';
  cropWindow.style.left = left + 'px'; cropWindow.style.top = top + 'px';
  dims.top.style.cssText = `left:0;top:0;width:${imgW}px;height:${top}px`;
  dims.bottom.style.cssText = `left:0;top:${top+cropH}px;width:${imgW}px;height:${imgH-top-cropH}px`;
  dims.left.style.cssText = `left:0;top:${top}px;width:${left}px;height:${cropH}px`;
  dims.right.style.cssText = `left:${left+cropW}px;top:${top}px;width:${imgW-left-cropW}px;height:${cropH}px`;
}
let dragging = false, dragStartX, dragStartY, dragStartPanX, dragStartPanY;
cropWindow.addEventListener('pointerdown', (e) => {
  if (mode === 'letterbox') return;
  e.preventDefault(); dragging = true; cropWindow.setPointerCapture(e.pointerId);
  dragStartX = e.clientX; dragStartY = e.clientY; dragStartPanX = panX; dragStartPanY = panY;
});
window.addEventListener('pointermove', (e) => {
  if (!dragging) return;
  const imgW = sourceImg.clientWidth, imgH = sourceImg.clientHeight;
  const imgAspect = imgW / imgH;
  let cropW, cropH;
  if (displayAspect > imgAspect) { cropW = imgW; cropH = imgW / displayAspect; }
  else { cropH = imgH; cropW = imgH * displayAspect; }
  const maxLeft = imgW - cropW, maxTop = imgH - cropH;
  panX = Math.max(0, Math.min(1, dragStartPanX + (maxLeft > 0 ? (e.clientX - dragStartX) / maxLeft : 0)));
  panY = Math.max(0, Math.min(1, dragStartPanY + (maxTop > 0 ? (e.clientY - dragStartY) / maxTop : 0)));
  dirty = true; layoutCrop();
});
window.addEventListener('pointerup', () => { if (dragging) { dragging = false; schedulePreview(); } });
let previewTimer = null;
function schedulePreview() { clearTimeout(previewTimer); previewTimer = setTimeout(refreshPreview, 400); }
function refreshPreview() {
  renderingLabel.style.visibility = 'visible';
  let url = `/preview/${photoKey}?mode=${mode}`;
  if (mode === 'zoom') url += `&pan_x=${panX.toFixed(3)}&pan_y=${panY.toFixed(3)}`;
  const img = new window.Image();
  img.onload = () => { previewImg.src = img.src; renderingLabel.style.visibility = 'hidden'; };
  img.onerror = () => { renderingLabel.style.visibility = 'hidden'; };
  img.src = url;
}
function save() {
  const body = { mode };
  if (mode === 'zoom') { body.pan_x = parseFloat(panX.toFixed(3)); body.pan_y = parseFloat(panY.toFixed(3)); }
  fetch(`/api/photos/${photoKey}/settings`, {
    method: 'PUT', headers: {'Content-Type': 'application/json'}, body: JSON.stringify(body)
  }).then(r => r.json()).then(() => {
    dirty = false; saveBtn.textContent = 'Saved'; saveBtn.classList.add('saved');
    setTimeout(() => { saveBtn.textContent = 'Save'; saveBtn.classList.remove('saved'); }, 1500);
  });
}
window.addEventListener('resize', layoutCrop);
</script>
</body>
</html>
"""


# --- Web UI ---

@app.route("/")
def index():
    all_photos = provider_manager.get_all_photos()
    orientation = frame_settings.get("orientation", "landscape")
    default_mode = frame_settings.get("default_mode", "zoom")
    return render_template_string(WEB_UI, photos=all_photos, state=frame_state,
                                  photo_count=len(all_photos), orientation=orientation,
                                  default_mode=default_mode)


@app.route("/health")
def health():
    all_photos = provider_manager.get_all_photos()
    return jsonify({"status": "ok", "photo_count": len(all_photos)})


WEB_UI = """<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Photo Frame</title>
<style>
  :root { --bg: #111; --card: #1a1a1a; --text: #eee; --accent: #6c8; --border: #333; }
  * { box-sizing: border-box; margin: 0; padding: 0; }
  body { font-family: -apple-system, system-ui, sans-serif; background: var(--bg); color: var(--text); min-height: 100vh; }
  .container { max-width: 960px; margin: 0 auto; padding: 1.5rem; }
  h1 { font-size: 1.5rem; margin-bottom: 1.5rem; }
  h1 span { color: var(--accent); }
  .status-card {
    background: var(--card); border: 1px solid var(--border); border-radius: 8px;
    padding: 1rem 1.25rem; margin-bottom: 1.5rem; display: flex; gap: 2rem; flex-wrap: wrap;
    align-items: flex-end;
  }
  .status-card .item { display: flex; flex-direction: column; gap: 0.2rem; }
  .status-card .label { font-size: 0.75rem; text-transform: uppercase; color: #888; }
  .status-card .value { font-size: 0.95rem; }
  .status-card .online { color: var(--accent); }
  .status-card .waiting { color: #f80; }
  .status-card select {
    background: #333; color: #eee; border: 1px solid var(--border); border-radius: 4px;
    padding: 0.25rem 0.4rem; font-size: 0.85rem;
  }
  .upload-area {
    background: var(--card); border: 2px dashed var(--border); border-radius: 8px;
    padding: 2rem; text-align: center; margin-bottom: 1.5rem; cursor: pointer;
    transition: border-color 0.2s;
  }
  .upload-area:hover, .upload-area.dragover { border-color: var(--accent); }
  .upload-area input { display: none; }
  .gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 0.75rem; }
  .photo-card {
    background: var(--card); border: 1px solid var(--border); border-radius: 6px;
    overflow: hidden; position: relative;
  }
  .photo-card img { width: 100%; aspect-ratio: 5/3; object-fit: cover; display: block; }
  .photo-card .info {
    padding: 0.5rem 0.6rem; display: flex; justify-content: space-between; align-items: center;
    font-size: 0.8rem;
  }
  .photo-card .name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 65%; }
  .photo-card .actions { display: flex; gap: 0.3rem; }
  .photo-card .btn {
    background: none; border: none; cursor: pointer; font-size: 0.85rem;
    padding: 0.2rem 0.4rem; border-radius: 4px;
  }
  .photo-card .simulate { color: #6c8; }
  .photo-card .simulate:hover { background: rgba(102,204,136,0.15); }
  .photo-card .delete { color: #f55; }
  .photo-card .delete:hover { background: rgba(255,85,85,0.15); }
  .photo-card.current { border-color: var(--accent); }
  .empty { text-align: center; padding: 3rem; color: #666; }
</style>
</head>
<body>
<div class="container">
  <h1><span>&#9632;</span> Photo Frame</h1>
  <div class="status-card">
    <div class="item">
      <span class="label">Frame Status</span>
      <span class="value {{ 'online' if state.get('last_update') else 'waiting' }}">
        {{ 'Online' if state.get('last_update') else 'Waiting for first update' }}
      </span>
    </div>
    {% if state.get('last_update') %}
    <div class="item">
      <span class="label">Last Update</span>
      <span class="value" data-utc="{{ state.last_update }}">{{ state.last_update[:19] }}</span>
    </div>
    <div class="item">
      <span class="label">Showing</span>
      <span class="value">{{ state.get('current_photo', 'Unknown') }}</span>
    </div>
    {% endif %}
    <div class="item">
      <span class="label">Photos</span>
      <span class="value">{{ photo_count }}</span>
    </div>
    <div class="item">
      <span class="label">Orientation</span>
      <select onchange="updateSetting('orientation', this.value)">
        <option value="landscape" {{ 'selected' if orientation == 'landscape' else '' }}>Landscape</option>
        <option value="portrait_cw" {{ 'selected' if orientation == 'portrait_cw' else '' }}>Portrait (CW)</option>
        <option value="portrait_ccw" {{ 'selected' if orientation == 'portrait_ccw' else '' }}>Portrait (CCW)</option>
      </select>
    </div>
    <div class="item">
      <span class="label">Default Mode</span>
      <select onchange="updateSetting('default_mode', this.value)">
        <option value="zoom" {{ 'selected' if default_mode == 'zoom' else '' }}>Zoom</option>
        <option value="letterbox" {{ 'selected' if default_mode == 'letterbox' else '' }}>Letterbox</option>
      </select>
    </div>
  </div>
  <div class="upload-area" id="upload-area" onclick="document.getElementById('file-input').click()">
    <input type="file" id="file-input" multiple accept="image/*">
    <p>Drop photos here or click to upload</p>
  </div>
  {% if photos %}
  <div class="gallery">
    {% for p in photos %}
    <div class="photo-card {{ 'current' if state.get('current_photo') == p.composite_key else '' }}" data-key="{{ p.composite_key }}">
      <img src="/thumb/{{ p.composite_key }}" loading="lazy" alt="{{ p.display_name }}">
      <div class="info">
        <span class="name" title="{{ p.display_name }}">{{ p.display_name }}</span>
        <div class="actions">
          <a class="btn simulate" href="/simulate/{{ p.composite_key }}" title="Preview on e-paper">&#9632;</a>
          <button class="btn delete" onclick="deletePhoto('{{ p.composite_key }}')" title="Delete">&times;</button>
        </div>
      </div>
    </div>
    {% endfor %}
  </div>
  {% else %}
  <div class="empty">No photos yet. Upload some!</div>
  {% endif %}
</div>
<script>
const area = document.getElementById('upload-area');
const input = document.getElementById('file-input');
['dragenter','dragover'].forEach(e => area.addEventListener(e, ev => { ev.preventDefault(); area.classList.add('dragover'); }));
['dragleave','drop'].forEach(e => area.addEventListener(e, ev => { ev.preventDefault(); area.classList.remove('dragover'); }));
area.addEventListener('drop', ev => { uploadFiles(ev.dataTransfer.files); });
input.addEventListener('change', () => { uploadFiles(input.files); });
function uploadFiles(files) {
  const fd = new FormData();
  for (const f of files) fd.append('photos', f);
  fetch('/api/upload', { method: 'POST', body: fd })
    .then(r => r.json())
    .then(d => { if (d.count > 0) location.reload(); });
}
function deletePhoto(key) {
  if (!confirm('Delete this photo?')) return;
  fetch('/api/photos/' + key, { method: 'DELETE' })
    .then(r => r.json())
    .then(() => { document.querySelector('[data-key="' + key + '"]')?.remove(); });
}
function updateSetting(key, value) {
  fetch('/api/settings', {
    method: 'PUT', headers: {'Content-Type': 'application/json'},
    body: JSON.stringify({[key]: value})
  });
}
document.querySelectorAll('[data-utc]').forEach(el => {
  const d = new Date(el.dataset.utc);
  el.textContent = d.toLocaleString();
});
</script>
</body>
</html>
"""


if __name__ == "__main__":
    parser = argparse.ArgumentParser(description="E-Ink Photo Frame Server")
    parser.add_argument("--port", type=int, default=8473)
    parser.add_argument("--photos-dir", type=str, default="./photos")
    args = parser.parse_args()

    photos_dir = Path(args.photos_dir)
    DATA_DIR = photos_dir / ".data"
    STATE_FILE = DATA_DIR / "frame_state.json"
    SETTINGS_FILE = DATA_DIR / "settings.json"
    IMAGE_SETTINGS_FILE = DATA_DIR / "image_settings.json"

    if not photos_dir.exists():
        photos_dir.mkdir(parents=True, exist_ok=True)

    # Reload state with correct paths
    frame_state = _load_json(STATE_FILE, lambda: {
        "last_update": None, "current_photo": None, "ip": None, "updates": 0
    })
    frame_settings = _load_json(SETTINGS_FILE, lambda: dict(DEFAULT_SETTINGS))
    image_settings = _load_json(IMAGE_SETTINGS_FILE, dict)

    # Initialize provider manager
    provider_manager = ProviderManager(DATA_DIR, default_photos_dir=str(photos_dir.resolve()))
    provider_manager.load()

    # Migrate legacy image settings to composite keys
    migrate_image_settings(DATA_DIR)

    # Reload image settings after migration
    image_settings = _load_json(IMAGE_SETTINGS_FILE, dict)

    all_photos = provider_manager.get_all_photos()
    print(f"Photos: {len(all_photos)} across {len(provider_manager.all_instances())} provider(s)")
    print(f"Orientation: {frame_settings['orientation']}, Default mode: {frame_settings['default_mode']}")
    print(f"Listening on port {args.port}")

    app.run(host="0.0.0.0", port=args.port)