"""Spearfish: what each seat sees (exec'd in Blender after a build, or headless on Tender_Spearfish.blend).
The user, 2026-10-20: "two seater next to each other when two player can seat each should can see the sea from the window
front". From each seat's eye (SOCKET_Seat_L_Eye, SOCKET_Seat_R_Eye) rays go out over the forward view: yaw -40..+40 deg
(+ = outboard, toward the seat's own side), pitch -25..+15 deg, 5 deg steps. A ray that first meets glass leaves the cabin: that seat sees the sea that
way. Writes checks/view.json and returns the summary."""
import bpy, math, os, json
from mathutils import Vector, Matrix
HERE = r"D:\HADAL - The Descent\models\tender-spearfish\build"
sc = bpy.context.scene
dg = bpy.context.evaluated_depsgraph_get()
GLASS = {"SM_Spearfish_Glass"}

def first_hit(o, d):
    ok, loc, nrm, idx, ob, mx = sc.ray_cast(dg, o, d)
    return (ob.name if ok else None), ((loc - o).length if ok else None)

out = {}
for nm, s in (("SOCKET_Seat_L_Eye", 1), ("SOCKET_Seat_R_Eye", -1)):
    eye = bpy.data.objects[nm].matrix_world.translation.copy()
    grid, hits = [], {}
    through = total = 0
    for pitch in range(-25, 16, 5):
        row = ""
        for yaw in range(-40, 41, 5):
            # forward is -Y; positive yaw turns outboard (toward this seat's own side)
            d = Matrix.Rotation(math.radians(yaw * s), 3, 'Z') @ Vector((0, -1, 0))
            d = Matrix.Rotation(math.radians(pitch), 3, d.cross(Vector((0, 0, 1))).normalized()) @ d
            ob, dist = first_hit(eye, d.normalized())
            total += 1
            if ob in GLASS:
                through += 1
                row += "o"
            else:
                row += "."
            hits[ob] = hits.get(ob, 0) + 1
        grid.append("%+03d %s" % (pitch, row))
    ahead, _ = first_hit(eye, Vector((0, -1, 0)))
    ahead_down, _ = first_hit(eye, (Matrix.Rotation(math.radians(-10), 3, Vector((1, 0, 0))) @ Vector((0, -1, 0))))
    out[nm] = {"eye": [round(c, 3) for c in eye], "straight_ahead": ahead, "ahead_10deg_down": ahead_down,
               "through_glass_pct": round(100.0 * through / total, 1), "first_hits": hits,
               "map (rows pitch -25..+15, columns yaw -40..+40, o = glass)": grid}
json.dump(out, open(os.path.join(HERE, "checks", "view.json"), "w"), indent=1)
result = {k: {kk: v[kk] for kk in ("eye", "straight_ahead", "ahead_10deg_down", "through_glass_pct")} for k, v in out.items()}
print("VIEW", json.dumps(result))