#!/usr/bin/env python3
"""Build the Companion 5 page export for the STATUS page from config.json.

Every positioned tile becomes a layered button whose background colour, text
colour and text are expressions over three custom variables:

  sp_state   JSON written by status_panel.py: {tile: {x, b, f, b2, f2}}
  sp_hb      unix time of status_panel.py's last write
  flash_tick the existing 1 Hz blink clock (trigger "flash_tick_500")

If sp_hb is more than 15 s old every tile turns purple, so a stopped
watchdog can never leave a frozen green page behind.

Buttons write commands into sp_cmd, which status_panel.py reads:
  press           ack <tile>        (the master acks everything)
  hold 2 seconds  restart <tile>    (restarts that tile's Companion connections)

  python3 make_page.py               -> status-page.companionconfig
"""
import gzip
import hashlib
import json
import os
import sys

HERE = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, HERE)
from status_panel import RESTARTABLE, load_config  # noqa: E402

EXPORT_VERSION = 12                       # Companion 5.0.7's export format
COMPANION_BUILD = "5.0.7+9763-stable-cec2f88e6f"
GRID = {"minColumn": 0, "maxColumn": 8, "minRow": 0, "maxRow": 5}
STALE_SECONDS = 15
PURPLE = 0x6A1B9A
HOLD_MS = 2000

ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_-"


def stable_id(*parts):
    """Companion-style 21 character id, the same on every build."""
    digest = hashlib.sha256("/".join(parts).encode()).digest()
    return "".join(ALPHABET[b % 64] for b in digest[:21])


def prop(value, expression=False):
    return {"value": value, "isExpression": expression}


def layers(tid, tile, names, stale_text):
    state, hb = names["state"], names["heartbeat"]
    stale = "$(internal:time_unix) - $(custom:%s) > %d" % (hb, STALE_SECONDS)

    def pick(on_key, off_key):
        return "jsonpath($(custom:%s), '$.%s.%s')" % (state, tid, on_key), \
               "jsonpath($(custom:%s), '$.%s.%s')" % (state, tid, off_key)

    b_on, b_off = pick("b", "b2")
    f_on, f_off = pick("f", "f2")
    bg = "%s ? %d : ($(custom:flash_tick) == 1 ? %s : %s)" % (stale, PURPLE, b_on, b_off)
    fg = "%s ? %d : ($(custom:flash_tick) == 1 ? %s : %s)" % (stale, 0xFFFFFF, f_on, f_off)
    text = "%s ? %s : jsonpath($(custom:%s), '$.%s.x')" % (stale, stale_text, state, tid)
    # The watchdog picks a size per key so words never break mid-word.
    size = "%s ? 20 : jsonpath($(custom:%s), '$.%s.s')" % (stale, state, tid)
    geometry = {"enabled": prop(True), "opacity": prop(100), "x": prop(0), "y": prop(0),
                "width": prop(100), "height": prop(100), "rotation": prop(0)}
    return [
        {"id": "canvas", "name": "Canvas", "usage": "auto", "type": "canvas",
         # "border": no top bar (more room for text), still shows a press.
         "decoration": prop("border"), "showStatusIcons": prop("default")},
        dict({"id": "box0", "name": "Background", "usage": "auto", "type": "box"}, **geometry,
             color=prop(bg, True), borderWidth=prop(0), borderColor=prop(0), borderPosition=prop("inside")),
        dict({"id": "image0", "name": "Image", "usage": "auto", "type": "image"}, **geometry,
             base64Image=prop(None), halign=prop("center"), valign=prop("center"), fillMode=prop("fit")),
        dict({"id": "text0", "name": "Text", "usage": "auto", "type": "text"}, **geometry,
             text=prop(text, True), color=prop(fg, True), halign=prop("center"), valign=prop("center"),
             fontsize=prop(size, True), fontsizeAllowShrink=prop(True), font=prop("companion-sans"),
             outlineColor=prop(4278190080)),
    ]


def command_action(tid, role, cmd_var, command):
    return {
        "type": "action",
        "id": stable_id(tid, role),
        "definitionId": "custom_variable_set_value",
        "connectionId": "internal",
        "options": {
            "name": prop(cmd_var),
            # Plain text, not an expression: Companion fills in $(custom:...) as text,
            # so this appends (two quick presses are both seen). In a Companion 5
            # expression '+' is numeric and 'a' + 'b' gives NaN.
            "value": prop("$(custom:%s);%s" % (cmd_var, command)),
        },
        "children": {},
    }


def button(tid, tile, cfg):
    names = cfg["variables"]
    kind = tile.get("kind")
    label = tile["label"]
    if kind == "master":
        # Template string: '+' would add numbers, not join text (see above).
        stale_text = "`${'WATCHDOG\\nDOWN\\n'}${$(internal:instance_errors)} ERR`"
        press, hold = "ackall", None
        note = "Press: acknowledge every alarm."
    elif kind == "service":
        stale_text = "'%s\\n?'" % label
        press, hold = "service toggle", None
        note = "Press: turn service mode on/off until the next scheduled window starts or ends."
    else:
        stale_text = "'%s\\n?'" % label
        press = "ack " + tid
        restartable = any(c["type"] in RESTARTABLE and c.get("conn") for c in tile.get("checks", []))
        hold = ("restart " + tid) if restartable else None
        note = "Press: acknowledge." + (" Hold 2 s: restart this tile's Companion connection(s)." if hold else "")
    action_sets = {"down": [], "up": [command_action(tid, "press", names["command"], press)]}
    run_while_held = []
    if hold:
        action_sets[str(HOLD_MS)] = [command_action(tid, "hold", names["command"], hold)]
        run_while_held = [HOLD_MS]
    return {
        "type": "button-layered",
        "style": {"layers": layers(tid, tile, names, stale_text)},
        "options": {"stepProgression": "auto", "stepExpression": "", "rotaryActions": False,
                    "canModifyStyleInApis": True,
                    "notes": "STATUS tile '%s' - drawn by status_panel.py on NA Ingest. %s" % (tid, note)},
        "feedbacks": [],
        "steps": {"0": {"action_sets": action_sets, "options": {"runWhileHeld": run_while_held}}},
        "localVariables": [],
    }


NAV_LOCATIONS = {"pageup": ("0", "0"), "pagenum": ("1", "0"), "pagedown": ("2", "0")}
NAV_MARKER = "STATUS nav key"


def nav_key(kind, names, status_page=None, hold_ms=1000, tap_page=1):
    """Companion's own UP / page number / DOWN key, coloured like the ALL button.

    For the page number key, status_page adds: tap = go to tap_page (on release,
    so a hold does not flash through it first), hold for hold_ms = go to the
    status page. The tap names the page outright: the converted key's "startup"
    means the current page on surfaces set to "use last page".
    """
    templates = json.load(open(os.path.join(HERE, "nav_templates.json")))
    key = json.loads(json.dumps(templates[kind]))
    stale = "$(internal:time_unix) - $(custom:%s) > %d" % (names["heartbeat"], STALE_SECONDS)
    pick = lambda field: "jsonpath($(custom:%s), '$.all.%s')" % (names["state"], field)
    bg = "%s ? %d : ($(custom:flash_tick) == 1 ? %s : %s)" % (stale, PURPLE, pick("b"), pick("b2"))
    fg = "%s ? %d : ($(custom:flash_tick) == 1 ? %s : %s)" % (stale, 0xFFFFFF, pick("f"), pick("f2"))

    def paint(layers):
        for layer in layers:
            if layer["type"] == "box":
                layer["color"] = prop(bg, True)
            elif layer["type"] == "text":
                layer["color"] = prop(fg, True)
            elif layer["type"] == "line":
                layer["borderColor"] = prop(fg, True)
            paint(layer.get("children", []))
    paint(key["style"]["layers"])
    if kind == "pagenum" and status_page:
        step = key["steps"]["0"]
        tap = step["action_sets"]["down"]
        tap[0]["options"]["page"] = prop(tap_page)
        hold = [{"type": "action", "id": stable_id("nav", "hold"), "definitionId": "set_page",
                 "connectionId": "internal",
                 "options": {"surfaceId": prop("self"), "page": prop(status_page)}, "children": {}}]
        step["action_sets"] = {"down": [], "up": tap, str(hold_ms): hold}
        step["options"]["runWhileHeld"] = [hold_ms]
    key["options"]["notes"] = ("%s (%s): colour follows the ALL button on the status page. "
                               "Undo on every page with: python3 nav_keys.py --revert" % (NAV_MARKER, kind))
    return key


def build(cfg):
    controls = {}
    coloured = cfg.get("nav_keys", list(NAV_LOCATIONS))       # which nav keys follow the ALL button
    for kind, (r, c) in NAV_LOCATIONS.items():
        controls.setdefault(r, {})[c] = (nav_key(kind, cfg["variables"], cfg["page"], cfg.get("nav_hold_ms", 1000),
                                                 cfg.get("nav_tap_page", 1))
                                         if kind in coloured else {"type": kind})
    for tile in cfg["tiles"]:
        if "pos" not in tile:
            continue
        r, c = (str(n) for n in tile["pos"])
        if controls.get(r, {}).get(c):
            raise ValueError("two buttons at row %s column %s" % (r, c))
        controls.setdefault(r, {})[c] = button(tile["id"], tile, cfg)
    return {
        "version": EXPORT_VERSION,
        "type": "page",
        "companionBuild": COMPANION_BUILD,
        "page": {"id": stable_id("page", cfg["page_name"]), "name": cfg["page_name"],
                 "controls": controls, "gridSize": GRID},
        "instances": {},
        "connectionCollections": [],
        "oldPageNumber": cfg["page"],
        "imageLibrary": [],
        "imageLibraryCollections": [],
    }


def main():
    cfg = load_config(os.path.join(HERE, "config.json"))
    out = sys.argv[1] if len(sys.argv) > 1 else os.path.join(HERE, "status-page.companionconfig")
    data = json.dumps(build(cfg), indent=1).encode()
    with gzip.open(out, "wb") as f:      # Companion's own exports are gzipped JSON
        f.write(data)
    print("wrote %s (%d buttons)" % (out, sum(1 for t in cfg["tiles"] if "pos" in t)))


if __name__ == "__main__":
    main()