"""Fenris theme presets (issue #80).

Three accessible colour presets: Amber (default), Nord, and High Contrast.
Themes style chrome, borders, accents, muted text, and graph roles;
status semantic colours/glyphs/text always win.

Theme roles for graph rendering expose distinct colours per preset so
the bar graph can reflect the user's visual preference without depending
on graph-ticket completion.

Criteria: TPH-10, AC80-1, AC80-5.
"""
from typing import Dict

from textual.theme import Theme


# ---------------------------------------------------------------------------
# Status semantic colours — always win, never themed (AC80-1)
# ---------------------------------------------------------------------------

STATUS_COLORS = {
    "monitoring": "green",
    "collecting": "green",
    "paused": "yellow",
    "waiting": "yellow",
    "interrupted": "red",
    "error": "red",
    "stale": "red",
    "unknown": "dim",
}


# ---------------------------------------------------------------------------
# Amber theme — warm golden tones (default, amber graph role)
# ---------------------------------------------------------------------------

_AMBER = Theme(
    name="fenris-amber",
    primary="#d4a017",       # warm amber
    secondary="#c49b0a",     # darker amber
    accent="#ffd54f",        # light amber highlight
    warning="#e6a817",       # amber warning
    error="#e74c3c",         # red error
    success="#27ae60",       # green success
    foreground="#e8e0d0",    # warm light
    background="#1a1510",    # warm dark
    surface="#241f16",       # warm surface
    panel="#2a2318",         # warm panel
    boost="#332a1c",         # warm boost
    dark=True,
    variables={
        "graph-allocated": "#d4a017",
        "graph-unallocated": "#8b6914",
        "graph-gap": "#554422",
        "graph-zero": "#665533",
        "graph-partial": "#aa8822",
        "graph-selection": "#ffd54f",
        "border-default": "#554422",
        "muted-text": "#887755",
    },
)

# ---------------------------------------------------------------------------
# Nord theme — cool blue-gray polar night palette
# ---------------------------------------------------------------------------

_NORD = Theme(
    name="fenris-nord",
    primary="#88c0d0",       # nord8 frost
    secondary="#81a1c1",     # nord9
    accent="#8fbcbb",        # nord7
    warning="#ebcb8b",       # nord13
    error="#bf616a",         # nord11
    success="#a3be8c",       # nord14
    foreground="#eceff4",    # nord6
    background="#2e3440",    # nord0
    surface="#3b4252",       # nord1
    panel="#434c5e",         # nord2
    boost="#4c566a",         # nord3
    dark=True,
    variables={
        "graph-allocated": "#88c0d0",
        "graph-unallocated": "#5e81ac",
        "graph-gap": "#4c566a",
        "graph-zero": "#616e88",
        "graph-partial": "#81a1c1",
        "graph-selection": "#8fbcbb",
        "border-default": "#4c566a",
        "muted-text": "#7b88a1",
    },
)

# ---------------------------------------------------------------------------
# High Contrast — maximum readability, pure black and white
# ---------------------------------------------------------------------------

_HIGH_CONTRAST = Theme(
    name="fenris-high-contrast",
    primary="#ffffff",       # pure white
    secondary="#dddddd",     # light gray
    accent="#ffff00",        # bright yellow
    warning="#ff8800",       # bright orange
    error="#ff0000",         # pure red
    success="#00ff00",       # pure green
    foreground="#ffffff",    # pure white
    background="#000000",    # pure black
    surface="#111111",       # near-black surface
    panel="#1a1a1a",         # near-black panel
    boost="#222222",         # near-black boost
    dark=True,
    variables={
        "graph-allocated": "#ffffff",
        "graph-unallocated": "#aaaaaa",
        "graph-gap": "#555555",
        "graph-zero": "#666666",
        "graph-partial": "#cccccc",
        "graph-selection": "#ffff00",
        "border-default": "#ffffff",
        "muted-text": "#aaaaaa",
    },
)


# ---------------------------------------------------------------------------
# Theme registry
# ---------------------------------------------------------------------------

THEMES = {
    "amber": _AMBER,
    "nord": _NORD,
    "high_contrast": _HIGH_CONTRAST,
}

THEME_NAMES = set(THEMES.keys())


def get_theme(name: str) -> Theme:
    """Return a registered theme by preset name.

    Unknown names fall back to Amber.
    """
    return THEMES.get(name, _AMBER)


def get_graph_colors(theme_name: str) -> Dict[str, str]:
    """Return the graph colour roles for a theme preset.

    Returns a dict with keys: allocated, unallocated, gap, zero, partial,
    selection.  Falls back to Amber for unknown names.
    """
    theme = get_theme(theme_name)
    variables = theme.variables or {}
    return {
        "allocated": variables.get("graph-allocated", "#d4a017"),
        "unallocated": variables.get("graph-unallocated", "#8b6914"),
        "gap": variables.get("graph-gap", "#554422"),
        "zero": variables.get("graph-zero", "#665533"),
        "partial": variables.get("graph-partial", "#aa8822"),
        "selection": variables.get("graph-selection", "#ffd54f"),
    }