"""Real surfaces for the pressure door, the same way the docking arm was done (models/docking-arm/build/surfaces.py,
whose node recipe is copied here): the user's rule is "realistic with good textures" from the first version.

  * tiling sets from the user's own Season 2 pack (already in the Unreal project), read in place by relative path
    from models/vessel-interior/textures/ModSci_Engineer/Textures: ScratchedMetal under the paint, StainedSteel for
    bare steel, Glass_DirtRough as a smudge mask, T_Scratch_Norm for fine scratches on the steel;
  * one map baked from the model in Cycles into a shared atlas, textures/T_PD_Masks.png (R occlusion, G edges,
    B crevices): a little shade in crevices, a few chips on exposed edges. The ship is clean: low wear, no rust;
  * generated here: textures/T_PD_Hazard_BaseColor.png (diagonal red/white stripes, seamless, 0.40 m a repeat) and
    textures/T_PD_Screen_Emissive.png (the control panel's status screen, no text).

UV layers (order matters for Unreal, which builds tangents from the first):
    UVMap   (UV0) unique unwrap inside the mesh's square of the shared atlas (the baked masks); the screens 0..1
    UV_Tile (UV1) metres, box-projected, for the tiling sets
The paint colour follows the reference pictures (pale steel blue); in Unreal it is one parameter of the material.
run() does everything; it is safe to run again.
"""
import bpy, bmesh, math, os, time
import numpy as np

FOLDER = r"D:\HADAL - The Descent\models\pressure-door"
TEX = os.path.join(FOLDER, "textures")
PACK = os.path.normpath(os.path.join(FOLDER, "..", "vessel-interior", "textures", "ModSci_Engineer", "Textures"))
SCR = ("Base/ScratchedMetal/T_ScratchedMetal_Diff.png", "Base/ScratchedMetal/T_ScratchedMetal_Rough.png", "Base/ScratchedMetal/T_ScratchedMetal_Normal.png")
STN = ("Base/StainedSteel/T_StainSteeled_Diff.png", "Base/StainedSteel/T_StainSteeled_Rough.png", None)
DIRT = "Base/Glass/T_Glass_DirtRough.png"
SCRATCH_N = "Base/Glass/T_Scratch_Norm.png"
ATLAS_SIZE = 4096
ATLAS_RECT = {"SM_PressureDoor_Leaf": (0.0, 0.0, 0.5), "SM_PressureDoor_Frame": (0.5, 0.0, 0.5),
              "SM_PressureDoor_Housing": (0.0, 0.5, 0.5), "SM_PressureDoor_Bulkhead": (0.5, 0.5, 0.25),
              "SM_PressureDoor_FloorPlate": (0.75, 0.5, 0.25), "SM_PressureDoor_Wheel": (0.5, 0.75, 0.25),
              "SM_PressureDoor_Bolt": (0.75, 0.75, 0.25)}
EDGE_R = 0.012
# screens: (material, facing y sign, x0, x1, z0, z1) -> UVMap 0..1 on their front faces
SCREENS = [(-1, 1.93, 2.19, 1.37, 1.51), (1, 1.74, 1.96, 1.365, 1.495)]

SURF = {
    "M_PD_Paint":    dict(set=SCR, tint=(0.105, 0.245, 0.315), metal=0.0, tile=0.90, shade=(0.90, 1.06), rough=(0.50, 0.30), normal=0.30,
                          dirt=0.04, dirt_tile=2.6, grime=0.20, wear=0.35, wear_col=(0.52, 0.53, 0.54), wear_rough=0.38),
    "M_PD_RedPaint": dict(set=SCR, tint=(0.62, 0.035, 0.025), metal=0.0, tile=0.60, shade=(0.88, 1.06), rough=(0.52, 0.32), normal=0.30,
                          dirt=0.05, dirt_tile=1.4, grime=0.20, wear=0.4, wear_col=(0.50, 0.51, 0.52), wear_rough=0.36),
    "M_PD_Steel":    dict(set=STN, tint=(0.80, 0.81, 0.83), metal=1.0, tile=0.50, shade=(0.85, 1.10), rough=(0.10, 0.24), normal=0.45, normal_map=SCRATCH_N,
                          dirt=0.04, dirt_tile=0.9, grime=0.18, wear=0.0),
    "M_PD_Dark":     dict(set=(STN[0], SCR[1], SCR[2]), tint=(0.032, 0.035, 0.039), metal=0.0, tile=0.70, shade=(0.87, 1.13), rough=(0.58, 0.38), normal=0.30,
                          dirt=0.06, dirt_tile=1.9, grime=0.12, wear=0.0),
    "M_PD_Rubber":   dict(set=(None, SCR[1], None), tint=(0.016, 0.016, 0.017), metal=0.0, tile=0.40, shade=(1.0, 1.0), rough=(0.86, 0.64), normal=0.0,
                          dirt=0.08, dirt_tile=1.2, grime=0.10, wear=0.0, dust=0.03),
}
GLOW = {"M_PD_LampRed": ((1.0, 0.06, 0.03), 6.0), "M_PD_LampGreen": ((0.08, 1.0, 0.25), 6.0)}


# ------------------------------------------------------------------ UV layers
def uv_tile_layer(me):
    """metres, by the face's dominant axis"""
    uv = me.uv_layers.get("UV_Tile") or me.uv_layers.new(name="UV_Tile")
    co = np.zeros(len(me.vertices) * 3, np.float32)
    me.vertices.foreach_get("co", co)
    co = co.reshape(-1, 3)
    out = np.zeros((len(me.loops), 2), np.float32)
    for p in me.polygons:
        n = p.normal
        ax = 0 if abs(n.x) >= abs(n.y) and abs(n.x) >= abs(n.z) else (1 if abs(n.y) >= abs(n.z) else 2)
        for li in range(p.loop_start, p.loop_start + p.loop_total):
            c = co[me.loops[li].vertex_index]
            out[li] = (c[1], c[2]) if ax == 0 else ((c[0], c[2]) if ax == 1 else (c[0], c[1]))
    uv.data.foreach_set("uv", out.ravel())


def uv_atlas_layer(ob, rect):
    me = ob.data
    if "UVMap" not in me.uv_layers:
        me.uv_layers.new(name="UVMap")
    # UVMap first, UV_Tile second
    names = [l.name for l in me.uv_layers]
    if names[0] != "UVMap":
        keep = {}
        for l in me.uv_layers:
            a = np.zeros(len(me.loops) * 2, np.float32)
            l.data.foreach_get("uv", a)
            keep[l.name] = a
        while len(me.uv_layers):
            me.uv_layers.remove(me.uv_layers[0])
        for nm in ("UVMap", "UV_Tile"):
            me.uv_layers.new(name=nm).data.foreach_set("uv", keep.get(nm, np.zeros(len(me.loops) * 2, np.float32)))
    me.uv_layers.active = me.uv_layers["UVMap"]
    me.uv_layers["UVMap"].active_render = True
    x0, y0, s = rect
    vl = bpy.context.view_layer
    for o in vl.objects:
        o.select_set(False)
    hidden = ob.hide_get()
    ob.hide_set(False)
    ob.select_set(True)
    vl.objects.active = ob
    bpy.ops.object.mode_set(mode='EDIT')
    bpy.ops.mesh.select_all(action='SELECT')
    margin = 6.0 / (s * ATLAS_SIZE)
    bpy.ops.uv.smart_project(angle_limit=math.radians(60), island_margin=margin, area_weight=0.0, correct_aspect=True, scale_to_bounds=False)
    bpy.ops.uv.select_all(action='SELECT')
    try:
        bpy.ops.uv.pack_islands(rotate=True, scale=True, margin_method='FRACTION', margin=margin, shape_method='CONCAVE')
    except Exception as ex:
        print("pack skipped", ob.name, ex)
    bpy.ops.object.mode_set(mode='OBJECT')
    a = np.zeros(len(me.loops) * 2, np.float32)
    me.uv_layers["UVMap"].data.foreach_get("uv", a)
    a = a.reshape(-1, 2)
    pad = 4.0 / (s * ATLAS_SIZE)
    a = np.array([x0, y0], np.float32) + (pad + np.clip(a, 0, 1) * (1 - 2 * pad)) * s
    me.uv_layers["UVMap"].data.foreach_set("uv", a.ravel())
    ob.hide_set(hidden)


def screen_uvs(me, mats):
    """the screens' fronts take the whole screen texture in UVMap (they are not baked: emissive)"""
    names = [m.name for m in me.materials]
    if "M_PD_Screen" not in names:
        return
    si = names.index("M_PD_Screen")
    uv = me.uv_layers["UVMap"]
    for p in me.polygons:
        if p.material_index != si:
            continue
        for (sg, x0, x1, z0, z1) in SCREENS:
            if p.normal.y * sg > 0.9:
                for li in range(p.loop_start, p.loop_start + p.loop_total):
                    c = me.vertices[me.loops[li].vertex_index].co
                    u = (c.x - x0) / (x1 - x0)
                    if sg > 0:
                        u = 1.0 - u                      # seen from behind
                    uv.data[li].uv = (min(max(u, 0), 1), min(max((c.z - z0) / (z1 - z0), 0), 1))


# ------------------------------------------------------------------ generated textures
def save_image(name, arr, colorspace='sRGB'):
    h, w = arr.shape[:2]
    im = bpy.data.images.get(name)
    if im is None or tuple(im.size) != (w, h):
        if im:
            bpy.data.images.remove(im)
        im = bpy.data.images.new(name, w, h, alpha=False)
    im.colorspace_settings.name = colorspace      # before the pixels: changing it regenerates a generated image (black)
    rgba = np.ones((h, w, 4), np.float32)
    rgba[..., :3] = arr[..., :3]
    im.pixels.foreach_set(rgba.ravel())
    im.filepath_raw = os.path.join(TEX, name + ".png")
    im.file_format = 'PNG'
    im.save()
    return im


def make_hazard(n=512):
    """seamless 45 degree stripes, red and off-white, values in sRGB"""
    y, x = np.mgrid[0:n, 0:n].astype(np.float32)
    period = n / 4.0
    ph = ((x + y) % period) / period
    m = np.clip((np.abs(ph - 0.5) - 0.25) * 40.0 + 0.5, 0, 1)    # 1 = white
    red = np.array([0.70, 0.13, 0.10], np.float32)
    wht = np.array([0.90, 0.90, 0.88], np.float32)
    return save_image("T_PD_Hazard_BaseColor", red * (1 - m[..., None]) + wht * m[..., None])


def make_screen(w=512, h=256):
    """status screen: frame, a padlock, three bars; emissive, values in sRGB. No lettering."""
    img = np.zeros((h, w, 3), np.float32)
    img[...] = (0.02, 0.10, 0.12)
    yy, xx = np.mgrid[0:h, 0:w]
    border = (xx < 6) | (xx > w - 7) | (yy < 6) | (yy > h - 7)
    img[border] = (0.10, 0.55, 0.62)
    img[(yy > h - 40) & (yy < h - 30) & (xx > 20) & (xx < w - 20)] = (0.10, 0.55, 0.62)      # header rule (rows count from the bottom)
    # padlock: body and shackle
    cx, cy = 110, 110
    body = (np.abs(xx - cx) < 46) & (yy > cy - 60) & (yy < cy + 10)
    rr = np.hypot(xx - cx, yy - (cy + 10))
    shackle = (rr > 24) & (rr < 36) & (yy >= cy + 10)
    img[body | shackle] = (0.20, 0.85, 0.95)
    img[(np.hypot(xx - cx, yy - (cy - 20)) < 9)] = (0.02, 0.10, 0.12)
    for k, frac in enumerate((0.9, 0.62, 0.35)):
        y0 = 150 - k * 42
        x0, x1 = 210, 210 + int(270 * frac)
        img[(yy > y0) & (yy < y0 + 22) & (xx > 210) & (xx < 480)] = (0.04, 0.22, 0.26)
        img[(yy > y0) & (yy < y0 + 22) & (xx > x0) & (xx < x1)] = (0.15, 0.75, 0.85)
    return save_image("T_PD_Screen_Emissive", img)


# ------------------------------------------------------------------ bake
def use_gpu():
    sc = bpy.context.scene
    sc.render.engine = 'CYCLES'
    try:
        prefs = bpy.context.preferences.addons['cycles'].preferences
        prefs.compute_device_type = 'HIP'
        prefs.get_devices()
        for d in prefs.devices:
            d.use = d.type == 'HIP'
        sc.cycles.device = 'GPU'
        return 'HIP'
    except Exception as ex:
        print("GPU not set:", ex)
        sc.cycles.device = 'CPU'
        return 'CPU'


def bake_masks(parts, reset=True):
    """parts: list of (name_in_atlas, mesh). One emit bake of each mesh alone (occlusion counts only the mesh itself)."""
    t0 = time.time()
    kind = use_gpu()
    sc = bpy.context.scene
    N = ATLAS_SIZE
    masks = bpy.data.images.get("T_PD_Masks")
    if masks is None or tuple(masks.size) != (N, N):
        if masks:
            bpy.data.images.remove(masks)
        masks = bpy.data.images.new("T_PD_Masks", N, N, alpha=False)
    masks.colorspace_settings.name = 'Non-Color'
    if reset:
        masks.pixels.foreach_set(np.tile(np.array((1.0, 0.0, 1.0, 1.0), np.float32), N * N))
    mm = bpy.data.materials.get("_bake_masks") or bpy.data.materials.new("_bake_masks")
    mm.use_nodes = True
    nt = mm.node_tree
    nt.nodes.clear()
    ao = nt.nodes.new('ShaderNodeAmbientOcclusion'); ao.samples = 16; ao.only_local = True; ao.inputs["Distance"].default_value = 0.45
    cv = nt.nodes.new('ShaderNodeAmbientOcclusion'); cv.samples = 16; cv.only_local = True; cv.inputs["Distance"].default_value = 0.05
    bv = nt.nodes.new('ShaderNodeBevel'); bv.samples = 8; bv.inputs["Radius"].default_value = EDGE_R
    geo = nt.nodes.new('ShaderNodeNewGeometry')
    dot = nt.nodes.new('ShaderNodeVectorMath'); dot.operation = 'DOT_PRODUCT'
    nt.links.new(bv.outputs["Normal"], dot.inputs[0]); nt.links.new(geo.outputs["Normal"], dot.inputs[1])
    inv = nt.nodes.new('ShaderNodeMath'); inv.operation = 'SUBTRACT'; inv.inputs[0].default_value = 1.0
    nt.links.new(dot.outputs["Value"], inv.inputs[1])
    edg = nt.nodes.new('ShaderNodeMath'); edg.operation = 'MULTIPLY'; edg.inputs[1].default_value = 3.5; edg.use_clamp = True
    nt.links.new(inv.outputs[0], edg.inputs[0])
    cc = nt.nodes.new('ShaderNodeCombineColor')
    nt.links.new(ao.outputs["AO"], cc.inputs[0]); nt.links.new(edg.outputs[0], cc.inputs[1]); nt.links.new(cv.outputs["AO"], cc.inputs[2])
    em = nt.nodes.new('ShaderNodeEmission')
    nt.links.new(cc.outputs[0], em.inputs["Color"])
    om = nt.nodes.new('ShaderNodeOutputMaterial')
    nt.links.new(em.outputs[0], om.inputs["Surface"])
    ti = nt.nodes.new('ShaderNodeTexImage'); ti.image = masks
    nt.nodes.active = ti
    sc.cycles.samples = 16
    sc.cycles.use_denoising = False
    sc.render.bake.margin = 6
    sc.render.bake.use_clear = False
    skip = {"M_PD_Screen", "M_PD_Hazard", "M_PD_LampRed", "M_PD_LampGreen", "M_PD_Glass"}
    for name, src in parts:
        me = src.copy()
        bm = bmesh.new()
        bm.from_mesh(me)
        names = [m.name for m in me.materials]
        kill = [f for f in bm.faces if names[f.material_index] in skip]
        bmesh.ops.delete(bm, geom=kill, context='FACES')
        for f in bm.faces:
            f.material_index = 0
        bm.to_mesh(me)
        bm.free()
        me.materials.clear()
        me.materials.append(mm)
        me.uv_layers.active = me.uv_layers["UVMap"]
        me.uv_layers["UVMap"].active_render = True
        tmp = bpy.data.objects.new("_bake_" + name, me)
        sc.collection.objects.link(tmp)
        for o2 in bpy.context.view_layer.objects:
            o2.select_set(False)
        tmp.select_set(True)
        bpy.context.view_layer.objects.active = tmp
        try:
            bpy.ops.object.bake(type='EMIT', margin=6, use_clear=False)
        finally:
            bpy.data.objects.remove(tmp)
            bpy.data.meshes.remove(me)
    masks.filepath_raw = os.path.join(TEX, "T_PD_Masks.png")
    masks.file_format = 'PNG'
    masks.save()
    bpy.data.materials.remove(mm)
    return masks, dict(device=kind, seconds=round(time.time() - t0, 1), size=N)


# ------------------------------------------------------------------ materials (node recipe from the docking arm)
def tex_image(path, colorspace="sRGB"):
    path = os.path.normpath(path)
    for im in bpy.data.images:
        if im.filepath and os.path.normpath(bpy.path.abspath(im.filepath)) == path:
            return im
    im = bpy.data.images.load(path)
    im.colorspace_settings.name = colorspace
    try:
        im.filepath = bpy.path.relpath(path)
    except Exception:
        pass
    return im


_RANGE = {}
def tex_range(im, lo=3, hi=97):
    if im.name not in _RANGE:
        n, ch = im.size[0] * im.size[1], im.channels
        px = np.empty(n * ch, np.float32)
        im.pixels.foreach_get(px)
        px = px.reshape(n, ch)
        if ch >= 3:
            c = px[:, :3]
            if im.colorspace_settings.name == 'sRGB':
                c = np.where(c <= 0.04045, c / 12.92, ((c + 0.055) / 1.055) ** 2.4)
            v = c @ np.array([0.2126, 0.7152, 0.0722], np.float32)
        else:
            v = px[:, 0]
        _RANGE[im.name] = (round(float(np.percentile(v, lo)), 4), round(float(np.percentile(v, hi)), 4))
    return _RANGE[im.name]


class Tree:
    def __init__(self, mat):
        mat.use_nodes = True
        self.nt = mat.node_tree
        self.nt.nodes.clear()
    def node(self, kind, label=None, **props):
        n = self.nt.nodes.new(kind)
        if label:
            n.label = label
        for k, v in props.items():
            setattr(n, k, v)
        i = len(self.nt.nodes) - 1
        n.location = (-2000 + 240 * (i // 4), 500 - 320 * (i % 4))
        return n
    def link(self, a, b):
        self.nt.links.new(a, b)
    def put(self, sock, v):
        if isinstance(v, bpy.types.NodeSocket):
            self.nt.links.new(v, sock)
        else:
            sock.default_value = v
    def math(self, op, a, b=None, clamp=False, label=None):
        n = self.node('ShaderNodeMath', label, operation=op, use_clamp=clamp)
        self.put(n.inputs[0], a)
        if b is not None:
            self.put(n.inputs[1], b)
        return n.outputs[0]
    def ranged(self, v, lo, hi, label=None, f0=0.0, f1=1.0, smooth=False):
        n = self.node('ShaderNodeMapRange', label)
        if smooth:
            n.interpolation_type = 'SMOOTHSTEP'
        self.put(n.inputs["Value"], v)
        n.inputs["From Min"].default_value = f0; n.inputs["From Max"].default_value = f1
        n.inputs["To Min"].default_value = lo; n.inputs["To Max"].default_value = hi
        return n.outputs["Result"]
    def mixc(self, fac, a, b, label=None):
        n = self.node('ShaderNodeMix', label, data_type='RGBA')
        self.put(n.inputs[0], fac)
        self.put(n.inputs[6], a if isinstance(a, bpy.types.NodeSocket) else tuple(a) + (1.0,))
        self.put(n.inputs[7], b if isinstance(b, bpy.types.NodeSocket) else tuple(b) + (1.0,))
        return n.outputs[2]
    def mixf(self, fac, a, b, label=None):
        n = self.node('ShaderNodeMix', label, data_type='FLOAT')
        self.put(n.inputs[0], fac); self.put(n.inputs[2], a); self.put(n.inputs[3], b)
        return n.outputs[0]
    def uv(self, name):
        return self.node('ShaderNodeUVMap', uv_map=name).outputs["UV"]
    def mapped(self, src, scale, label=None):
        n = self.node('ShaderNodeMapping', label)
        self.nt.links.new(src, n.inputs["Vector"])
        n.inputs["Scale"].default_value = (scale, scale, scale)
        return n.outputs["Vector"]
    def tex(self, im, vec, label=None):
        n = self.node('ShaderNodeTexImage', label, image=im)
        self.nt.links.new(vec, n.inputs["Vector"])
        return n


def dress(mat, r, masks=None, base_img=None, base_tile=None):
    """a coated or bare metal surface: a tiling set + smudges; with the baked masks also shade in crevices and a few
    chips on exposed edges. base_img replaces the tint (the hazard stripes)."""
    t = Tree(mat)
    b = t.node('ShaderNodeBsdfPrincipled')
    out = t.node('ShaderNodeOutputMaterial')
    t.link(b.outputs[0], out.inputs["Surface"])
    u0 = t.uv("UV_Tile")
    mp = t.mapped(u0, 1.0 / r["tile"], "one repeat = %.2f m" % r["tile"])
    diff, rough, normal = r["set"]
    dirt = t.tex(tex_image(os.path.join(PACK, DIRT), "Non-Color"), t.mapped(u0, 1.0 / r["dirt_tile"]), "smudges and dust").outputs["Color"]
    ao = edge = crev = None
    if masks is not None:
        sep = t.node('ShaderNodeSeparateColor')
        t.link(t.tex(masks, t.uv("UVMap"), "baked: R occlusion, G edges, B crevices").outputs["Color"], sep.inputs[0])
        ao, edge, crev = sep.outputs[0], sep.outputs[1], sep.outputs[2]
    tint = tuple(r["tint"])
    if base_img is not None:
        tint_sock = t.tex(base_img, t.mapped(u0, 1.0 / base_tile, "stripes: %.2f m a repeat" % base_tile), "stripes").outputs["Color"]
    else:
        tint_sock = None
    col = tint if tint_sock is None else tint_sock
    if diff:
        im = tex_image(os.path.join(PACK, diff))
        lo, hi = tex_range(im)
        bw = t.node('ShaderNodeRGBToBW')
        t.link(t.tex(im, mp, "surface, diffuse").outputs["Color"], bw.inputs[0])
        sh = t.ranged(bw.outputs[0], r["shade"][0], r["shade"][1], "shade the tint", lo, hi)
        if tint_sock is None:
            vm = t.node('ShaderNodeVectorMath', "tint x shade", operation='SCALE')
            vm.inputs[0].default_value = tint
            t.link(sh, vm.inputs["Scale"])
        else:
            vm = t.node('ShaderNodeVectorMath', "stripes x shade", operation='SCALE')
            t.link(tint_sock, vm.inputs[0])
            t.link(sh, vm.inputs["Scale"])
        col = vm.outputs["Vector"]
    grime = None
    if crev is not None and r["grime"] > 0:
        grime = t.math('MULTIPLY', t.math('POWER', t.math('SUBTRACT', 1.0, crev), 1.4), r["grime"], clamp=True, label="shade in crevices")
        col = t.mixc(grime, col, (0.02, 0.019, 0.018), "darken crevices")
    if ao is not None:
        col = t.mixc(t.ranged(ao, 0.35, 0.0, "occlusion", 0.0, 1.0), col, (0.01, 0.01, 0.01), "occlusion")
    if r.get("dust"):
        col = t.mixc(t.math('MULTIPLY', dirt, r["dust"]), col, (0.55, 0.53, 0.50), "dust")
    rim = tex_image(os.path.join(PACK, rough), "Non-Color")
    rlo, rhi = tex_range(rim)
    ro = t.tex(rim, mp, "surface, roughness").outputs["Color"]
    rr = t.ranged(ro, r["rough"][0], r["rough"][1], "roughness range", rlo, rhi)
    rr = t.math('ADD', rr, t.math('MULTIPLY', dirt, r["dirt"]), clamp=True, label="smudges dull the sheen")
    if grime is not None:
        rr = t.math('ADD', rr, t.math('MULTIPLY', grime, 0.35), clamp=True, label="crevices are matte")
    metal = r["metal"]
    if edge is not None and r["wear"] > 0:
        breakup = t.ranged(ro, 1.25, 0.55, "scratches break the wear up", rlo, rhi)
        exposed = t.ranged(ao, 0.0, 1.0, "only where the part is exposed", 0.72, 0.93, smooth=True)
        w = t.math('MULTIPLY', t.math('MULTIPLY', t.math('MULTIPLY', edge, breakup), exposed), r["wear"])
        w = t.ranged(w, 0.0, 1.0, "chipped edge", 0.38, 0.72, smooth=True)
        col = t.mixc(w, col, tuple(r["wear_col"]), "metal under the coating")
        rr = t.mixf(w, rr, r["wear_rough"])
        metal = t.mixf(w, r["metal"], 1.0)
    t.put(b.inputs["Base Color"], col)
    t.put(b.inputs["Roughness"], rr)
    t.put(b.inputs["Metallic"], metal)
    nm_file = r.get("normal_map") or normal
    if nm_file and r["normal"] > 0:
        nd = t.node('ShaderNodeNormalMap', "fine relief", uv_map="UV_Tile")
        nd.inputs["Strength"].default_value = r["normal"]
        t.link(t.tex(tex_image(os.path.join(PACK, nm_file), "Non-Color"), mp, "surface, normal").outputs["Color"], nd.inputs["Color"])
        t.link(nd.outputs["Normal"], b.inputs["Normal"])
    mat.diffuse_color = tuple(r["tint"]) + (1.0,)
    mat.metallic = r["metal"]


def dress_glow(mat, color, strength):
    t = Tree(mat)
    b = t.node('ShaderNodeBsdfPrincipled')
    out = t.node('ShaderNodeOutputMaterial')
    t.link(b.outputs[0], out.inputs["Surface"])
    b.inputs["Base Color"].default_value = (0.03, 0.03, 0.03, 1)
    b.inputs["Roughness"].default_value = 0.2
    b.inputs["Emission Color"].default_value = tuple(color) + (1,)
    b.inputs["Emission Strength"].default_value = strength
    mat.diffuse_color = tuple(color) + (1.0,)


def dress_screen(mat, img):
    t = Tree(mat)
    b = t.node('ShaderNodeBsdfPrincipled')
    out = t.node('ShaderNodeOutputMaterial')
    t.link(b.outputs[0], out.inputs["Surface"])
    tx = t.tex(img, t.uv("UVMap"), "status screen")
    b.inputs["Base Color"].default_value = (0.01, 0.012, 0.014, 1)
    b.inputs["Roughness"].default_value = 0.08
    t.link(tx.outputs["Color"], b.inputs["Emission Color"])
    b.inputs["Emission Strength"].default_value = 3.0
    mat.diffuse_color = (0.1, 0.5, 0.6, 1)


def dress_glass(mat):
    t = Tree(mat)
    b = t.node('ShaderNodeBsdfPrincipled')
    out = t.node('ShaderNodeOutputMaterial')
    t.link(b.outputs[0], out.inputs["Surface"])
    dirt = t.tex(tex_image(os.path.join(PACK, DIRT), "Non-Color"), t.mapped(t.uv("UV_Tile"), 1.0 / 0.5), "smudges").outputs["Color"]
    b.inputs["Base Color"].default_value = (0.82, 0.90, 0.93, 1)
    b.inputs["Transmission Weight"].default_value = 1.0
    b.inputs["IOR"].default_value = 1.47
    t.put(b.inputs["Roughness"], t.ranged(dirt, 0.03, 0.12))
    mat.diffuse_color = (0.6, 0.7, 0.75, 0.4)


# ------------------------------------------------------------------ all
OBJECTS = ["SM_PressureDoor_Leaf", "SM_PressureDoor_Frame", "SM_PressureDoor_Housing", "SM_PressureDoor_Bulkhead",
           "SM_PressureDoor_FloorPlate", "SM_PressureDoor_Wheel"]


def run(bake=True, uvs=True):
    os.makedirs(TEX, exist_ok=True)
    t0 = time.time()
    meshes = [(n, bpy.data.objects[n]) for n in OBJECTS]
    bolt_ob = bpy.data.objects["SM_PressureDoor_Bolt_01"]
    for n, ob in (meshes + [("SM_PressureDoor_Bolt", bolt_ob)] if uvs else []):
        uv_tile_layer(ob.data)
        uv_atlas_layer(ob, ATLAS_RECT[n])
        screen_uvs(ob.data, None)
    info = {}
    if bake:
        masks, info = bake_masks([(n, ob.data) for n, ob in meshes] + [("SM_PressureDoor_Bolt", bolt_ob.data)])
    else:
        masks = bpy.data.images.get("T_PD_Masks")
    hz = make_hazard()
    scr = make_screen()
    for name, r in SURF.items():
        dress(bpy.data.materials[name], r, masks)
    dress(bpy.data.materials["M_PD_Hazard"], dict(SURF["M_PD_Paint"], tint=(1, 1, 1), shade=(0.92, 1.04), wear=0.0, grime=0.12), masks,
          base_img=hz, base_tile=0.40)
    for name, (c, s) in GLOW.items():
        dress_glow(bpy.data.materials[name], c, s)
    dress_screen(bpy.data.materials["M_PD_Screen"], scr)
    dress_glass(bpy.data.materials["M_PD_Glass"])
    info["total_s"] = round(time.time() - t0, 1)
    return info


def bake_one(name, reset=False):
    """bake a single mesh into the atlas (for short MCP calls); name as in ATLAS_RECT"""
    src = bpy.data.objects["SM_PressureDoor_Bolt_01"].data if name == "SM_PressureDoor_Bolt" else bpy.data.objects[name].data
    return bake_masks([(name, src)], reset=reset)[1]


def redo_one(name):
    """after rebuilding one mesh: its two UV layers and its square of the atlas"""
    ob = bpy.data.objects["SM_PressureDoor_Bolt_01"] if name == "SM_PressureDoor_Bolt" else bpy.data.objects[name]
    uv_tile_layer(ob.data)
    uv_atlas_layer(ob, ATLAS_RECT[name])
    screen_uvs(ob.data, None)
    return bake_one(name, reset=False)