"""
Icon registry — semantic Unicode symbols + PNG Material Design icons.
Centralized icon management for buttons, tabs, menus, and type badges.

PNG icons (assets/icons/dark/ + light/) auto-switch with CTk dark/light theme.
If PNG files or PIL are missing, all functions gracefully fall back to Unicode.
"""

import os
import sys
from typing import Optional

# ── Asset path resolution ──────────────────────────────
if getattr(sys, "frozen", False) and hasattr(sys, "_MEIPASS"):
    _ASSETS_DIR = os.path.join(sys._MEIPASS, "assets", "icons")
else:
    _ASSETS_DIR = os.path.join(
        os.path.dirname(os.path.dirname(os.path.abspath(__file__))),
        "assets", "icons",
    )

_HAS_PNG = os.path.isdir(_ASSETS_DIR)
_HAS_PIL: Optional[bool] = None  # lazy-checked on first ctk_icon() call

# ── Semantic name → Material icon filename ─────────────
ICON_FILES = {
    "back": "arrow_back", "up": "arrow_upward", "refresh": "refresh",
    "add": "add", "edit": "edit", "delete": "delete", "confirm": "check",
    "upload": "file_upload", "download": "file_download",
    "execute": "play_arrow", "info": "info", "clear": "backspace",
    "search": "search", "folder": "folder", "folder_open": "folder_open",
    "save": "save", "key": "vpn_key", "lock": "lock", "eye": "visibility",
    "copy": "content_copy", "gear": "settings", "globe": "language",
    "terminal": "code", "query": "play_arrow", "dashboards": "dashboard",
    "metrics": "trending_up", "powershell": "code", "launch": "computer",
    "totp": "lock", "objects": "storage", "connect": "play_arrow",
    "browser": "language", "close": "close",
}

# Semantic icon mapping
ICONS = {
    # Navigation
    "back": "\u2190",        # ←
    "up": "\u2191",          # ↑
    "refresh": "\u21bb",     # ↻

    # CRUD
    "add": "\uff0b",         # ＋
    "edit": "\u270e",        # ✎
    "delete": "\u2715",      # ✕
    "confirm": "\u2713",     # ✓

    # Transfer
    "upload": "\u2b06",      # ⬆
    "download": "\u2b07",    # ⬇

    # Actions
    "execute": "\u25b6",     # ▶
    "info": "\u2139",        # ℹ
    "clear": "\u232b",       # ⌫
    "search": "\U0001f50d",  # 🔍
    "hash": "#",

    # Files
    "folder": "\U0001f4c1",  # 📁
    "folder_open": "\U0001f4c2",  # 📂
    "save": "\U0001f4be",    # 💾

    # Keys & security
    "key": "\U0001f511",     # 🔑
    "lock": "\U0001f510",    # 🔐
    "eye": "\U0001f441",     # 👁

    # Clipboard
    "copy": "\U0001f4cb",    # 📋

    # Settings
    "gear": "\u2699",        # ⚙
    "globe": "\U0001f310",   # 🌐

    # Status
    "online": "\u25cf",      # ●
    "checking": "\u25d0",    # ◐
    "offline": "\u2014",     # —

    # Tabs
    "terminal": "\u2328",    # ⌨
    "query": "\u25b6",       # ▶
    "dashboards": "\U0001f4ca",   # 📊
    "metrics": "\U0001f4c8",      # 📈
    "powershell": "\u2328",  # ⌨
    "launch": "\U0001f5a5",  # 🖥
    "totp": "\U0001f510",    # 🔐
    "objects": "\U0001faa3", # 🪣

    # Context menu
    "connect": "\u25b6",     # ▶
    "browser": "\U0001f310", # 🌐
    "status_check": "\u25cf",# ●
}


def icon(name: str) -> str:
    """Get icon symbol by semantic name."""
    return ICONS.get(name, "")


def icon_text(name: str, label: str) -> str:
    """Format 'icon label' string for buttons/menus."""
    sym = ICONS.get(name, "")
    if sym:
        return f"{sym} {label}"
    return label


# Server type colors
TYPE_COLORS = {
    "ssh": "#22c55e",
    "telnet": "#a855f7",
    "rdp": "#3b82f6",
    "vnc": "#6366f1",
    "winrm": "#0ea5e9",
    "mariadb": "#f59e0b",
    "mssql": "#ef4444",
    "postgresql": "#3b82f6",
    "redis": "#dc2626",
    "grafana": "#f97316",
    "prometheus": "#e11d48",
    "s3": "#16a34a",
}

# Unicode symbols for each server type (reliable, no PIL needed)
TYPE_SYMBOLS = {
    "ssh": "\U0001f5a5",       # 🖥
    "telnet": "\U0001f4df",    # 📟
    "rdp": "\U0001f5b5",       # 🖵
    "vnc": "\U0001f5b5",       # 🖵
    "winrm": "\u229e",         # ⊞
    "mariadb": "\U0001f4be",   # 💾
    "mssql": "\U0001f4be",     # 💾
    "postgresql": "\U0001f418",# 🐘
    "redis": "\u25c6",         # ◆
    "grafana": "\U0001f4ca",   # 📊
    "prometheus": "\U0001f525", # 🔥
    "s3": "\U0001faa3",         # 🪣
}

# Short text labels for sidebar badge
TYPE_LABELS = {
    "ssh": "SSH",
    "telnet": "TEL",
    "rdp": "RDP",
    "vnc": "VNC",
    "winrm": "PS",
    "mariadb": "MDB",
    "mssql": "SQL",
    "postgresql": "PG",
    "redis": "RDS",
    "grafana": "GRF",
    "prometheus": "PRM",
    "s3": "S3",
}


def type_display(server_type: str) -> str:
    """Return 'symbol type' for dropdown display, e.g. '🖥 ssh'."""
    sym = TYPE_SYMBOLS.get(server_type, "")
    if sym:
        return f"{sym} {server_type}"
    return server_type


def type_from_display(display: str) -> str:
    """Extract raw type from display string, e.g. '🖥 ssh' -> 'ssh'."""
    # Strip the leading symbol + space
    for stype in TYPE_SYMBOLS:
        suffix = f" {stype}"
        if display.endswith(suffix) and len(display) == len(suffix) + len(TYPE_SYMBOLS.get(stype, "")):
            return stype
    # Fallback: return as-is (might already be raw type)
    return display.strip()


# Tab icon mapping (tab_key -> icon_name)
TAB_ICONS = {
    "terminal": "terminal",
    "files": "folder",
    "info": "info",
    "keys": "key",
    "totp": "totp",
    "setup": "gear",
    "query": "query",
    "console": "terminal",
    "dashboards": "dashboards",
    "metrics": "metrics",
    "powershell": "powershell",
    "launch": "launch",
    "objects": "objects",
}

# Context menu icon mapping (i18n_key -> icon_name)
CTX_ICONS = {
    "ctx_open_terminal": "terminal",
    "ctx_browse_files": "folder",
    "ctx_install_key": "key",
    "ctx_open_powershell": "powershell",
    "ctx_open_query": "query",
    "ctx_open_console": "terminal",
    "ctx_connect": "connect",
    "ctx_open_browser": "browser",
    "ctx_check_status": "status_check",
    "ctx_copy_alias": "copy",
    "ctx_disconnect": "close",
    "edit": "edit",
    "delete": "delete",
}


# ── CTkImage cache + loader ────────────────────────────
_icon_cache: dict[tuple, object] = {}


def ctk_icon(name: str, size: int = 20) -> Optional[object]:
    """PNG icon as CTkImage, or None (fallback to Unicode).

    Lazy-imports PIL and customtkinter on first call so that
    icons.py stays usable as a pure data module for CLI tools.
    """
    global _HAS_PIL
    if _HAS_PIL is None:
        try:
            from PIL import Image as _img   # noqa: F401
            import customtkinter as _ctk    # noqa: F401
            _HAS_PIL = True
        except ImportError:
            _HAS_PIL = False
    if not _HAS_PIL or not _HAS_PNG:
        return None

    cache_key = (name, size)
    if cache_key in _icon_cache:
        return _icon_cache[cache_key]

    file_stem = ICON_FILES.get(name)
    if not file_stem:
        return None

    from PIL import Image
    import customtkinter as ctk

    dark_path = os.path.join(_ASSETS_DIR, "dark", f"{file_stem}.png")
    light_path = os.path.join(_ASSETS_DIR, "light", f"{file_stem}.png")

    if not os.path.exists(dark_path) or not os.path.exists(light_path):
        return None
    try:
        light_img = Image.open(light_path)  # black icons for light bg
        dark_img = Image.open(dark_path)    # white icons for dark bg
        result = ctk.CTkImage(
            light_image=light_img, dark_image=dark_img,
            size=(size, size),
        )
        _icon_cache[cache_key] = result
        return result
    except Exception:
        return None


def make_icon_button(parent, icon_name: str, label: str,
                     icon_size: int = 16, **kwargs):
    """CTkButton with PNG icon or Unicode fallback."""
    import customtkinter as _ctk
    img = ctk_icon(icon_name, icon_size)
    if img:
        return _ctk.CTkButton(parent, text=label, image=img,
                               compound="left", **kwargs)
    return _ctk.CTkButton(parent, text=icon_text(icon_name, label), **kwargs)


def make_icon_label(parent, icon_name: str, icon_size: int = 18, **kwargs):
    """CTkLabel with PNG icon or Unicode fallback."""
    import customtkinter as _ctk
    img = ctk_icon(icon_name, icon_size)
    if img:
        return _ctk.CTkLabel(parent, text="", image=img, **kwargs)
    return _ctk.CTkLabel(parent, text=ICONS.get(icon_name, ""), **kwargs)


def reconfigure_icon_button(btn, icon_name: str, label: str,
                            icon_size: int = 16):
    """Update existing button text + image (for update_language)."""
    img = ctk_icon(icon_name, icon_size)
    if img:
        btn.configure(text=label, image=img)
    else:
        btn.configure(text=icon_text(icon_name, label))