# Export the two in-scope north-side background buildings from the OSM blockout.
#
#   blender -b --factory-startup Art/blender/blockout/blockout-2026-11-06.blend \
#       --python Tools/export_north_buildings.py -- --out /tmp/gigline/north
#
# The blockout is already in the shared project frame (metres, X east / Y north /
# Z up, origin Hollywood x Highland), so exporting each object at its own world
# position preserves the offset from the hero facade. The site export preset
# (`ue_metric_v1`) is reused verbatim so the metre->centimetre mapping matches.

import argparse
import os
import sys

import bpy

BUILDINGS = ("TCL Chinese Theatre", "Madame Tussaud's")


def main():
    argv = sys.argv[sys.argv.index("--") + 1:] if "--" in sys.argv else []
    ap = argparse.ArgumentParser()
    ap.add_argument("--out", default="/tmp/gigline/north")
    args = ap.parse_args(argv)
    os.makedirs(args.out, exist_ok=True)

    print(f"[north] scene objects: {len(bpy.data.objects)}")
    for name in BUILDINGS:
        obj = bpy.data.objects.get(name)
        if obj is None or obj.type != "MESH":
            print(f"[north] MISSING {name}")
            continue
        bpy.ops.object.select_all(action="DESELECT")
        obj.select_set(True)
        bpy.context.view_layer.objects.active = obj
        mesh = obj.data
        if not mesh.materials:
            mat = bpy.data.materials.new(f"M_{name.replace(' ', '_')}")
            mat.diffuse_color = (0.75, 0.72, 0.68, 1.0)
            mat.use_nodes = False
            mesh.materials.append(mat)

        # The blockout sits with the hero (6840, south side) at negative Y. The two
        # in-scope north buildings must land ACROSS Hollywood Blvd at positive Y in
        # Unreal. Mirror the exported geometry across the road centreline (Y=0) and
        # reverse winding; the FBX exporter does not do this for us.
        new_mesh = mesh.copy()
        new_obj = obj.copy()
        new_obj.data = new_mesh
        new_obj.matrix_world = obj.matrix_world.copy()
        bpy.context.collection.objects.link(new_obj)
        import mathutils as mu
        world = new_obj.matrix_world
        inv = world.inverted()
        for v in new_mesh.vertices:
            wp = world @ v.co
            wp.y = -wp.y
            v.co = inv @ wp
        for poly in new_mesh.polygons:
            verts = list(poly.vertices)
            verts.reverse()
            poly.vertices = verts
        new_mesh.update()
        bpy.ops.object.select_all(action="DESELECT")
        new_obj.select_set(True)
        bpy.context.view_layer.objects.active = new_obj

        path = os.path.join(args.out, name.replace(" ", "_").replace("'", "") + ".fbx")
        bpy.ops.export_scene.fbx(
            filepath=path,
            use_selection=True,
            object_types={"MESH"},
            apply_unit_scale=True,
            apply_scale_options="FBX_SCALE_NONE",
            axis_forward="-Y",
            axis_up="Z",
            use_space_transform=True,
            use_mesh_modifiers=True,
            mesh_smooth_type="OFF",
            path_mode="AUTO",
            bake_space_transform=False,
        )
        zs = [(world @ v.co).z for v in new_mesh.vertices]
        print(f"[north] {name:22} verts {len(new_mesh.vertices):5}  z {min(zs):+.2f}..{max(zs):+.2f} m "
              f"-> {path}")
        bpy.data.objects.remove(new_obj, do_unlink=True)

    print(f"[north] done")


main()