#! python 3
# -*- coding: utf-8 -*-
"""
kamera.py
Kamera-Panel: liest/setzt Viewport-Kamera (Position, Target, Projektion,
FOV/Frustum, Linse). Persistiert Presets in doc.Strings unter
`dossier_kamera_presets` (JSON-Liste).
"""
import os
import sys
import json
import math
import uuid
import Rhino
import Rhino.Geometry as rg
import scriptcontext as sc

_HERE = os.path.dirname(os.path.abspath(__file__))
if _HERE not in sys.path:
    sys.path.insert(0, _HERE)

import panel_base

PANEL_GUID_STR = "9c3f8a2d-7b4e-4a6f-9c12-1d4e5f6a7b89"
_PRESETS_KEY   = "dossier_kamera_presets"
_NORTH_KEY     = "dossier_north_angle"  # Grad im Uhrzeigersinn von +Y


# ---------------------------------------------------------------------------
# Norden-Rotation: Default +Y = Norden. Bei rotierten Projekten (Site-Plaene,
# swissBUILDINGS in LV95-Orientierung) kann der User einen Winkel definieren.
# Wirkt auf N/O/S/W-View-Buttons + (optional) Iso-Octanten.

def get_north_angle(doc):
    if doc is None: return 0.0
    try:
        v = doc.Strings.GetValue(_NORTH_KEY)
        return float(v) if v else 0.0
    except Exception:
        return 0.0


def set_north_angle(doc, angle):
    if doc is None: return
    try:
        a = float(angle) % 360.0
        doc.Strings.SetString(_NORTH_KEY, "{:.3f}".format(a))
    except Exception as ex:
        print("[KAMERA] set north:", ex)


def _scene_target_and_diag(doc):
    """Centroid der Szenen-BBox + Diagonal-Laenge. Fallback (0,0,0)/50m."""
    target = rg.Point3d(0, 0, 0)
    diag = 50.0
    try:
        scene_bb = None
        for obj in doc.Objects:
            if obj is None: continue
            gb = obj.Geometry.GetBoundingBox(True)
            if not gb.IsValid: continue
            if scene_bb is None: scene_bb = gb
            else: scene_bb.Union(gb)
        if scene_bb is not None and scene_bb.IsValid:
            target = scene_bb.Center
            diag = max(scene_bb.Diagonal.Length, 10.0)
    except Exception: pass
    return target, diag


def set_cardinal_view(vp, cardinal):
    """Setzt N/O/S/W-Ansicht unter Beruecksichtigung der Norden-Rotation.
    cardinal: 'N' | 'O' | 'S' | 'W'."""
    if vp is None: return
    doc = Rhino.RhinoDoc.ActiveDoc
    if doc is None: return
    try:
        north_deg = get_north_angle(doc)
        # Norden-Einheitsvektor (Uhrzeigersinn-Rotation von +Y aus Top-View):
        # angle=0 → (0,1,0); angle=90 → (1,0,0); angle=180 → (0,-1,0).
        nrad = math.radians(north_deg)
        north = (math.sin(nrad), math.cos(nrad))
        east  = (math.cos(nrad), -math.sin(nrad))
        c = cardinal.upper()
        if   c == "N": dx, dy = north
        elif c == "S": dx, dy = -north[0], -north[1]
        elif c == "O" or c == "E": dx, dy = east
        elif c == "W": dx, dy = -east[0], -east[1]
        else: return

        target, diag = _scene_target_and_diag(doc)
        dist = diag * 1.6
        # Kamera auf Hoehe des Target-Z (echte Elevation, horizontal blickend)
        loc = rg.Point3d(target.X + dx * dist,
                          target.Y + dy * dist,
                          target.Z)
        if not vp.IsParallelProjection:
            vp.ChangeToParallelProjection(True)
        vp.SetCameraLocations(target, loc)
        # Camera-Up muss +Z sein (sonst kippt die Ansicht)
        try: vp.CameraUp = rg.Vector3d.ZAxis
        except Exception: pass
        try: vp.ZoomExtents()
        except Exception: pass
        Rhino.RhinoDoc.ActiveDoc.Views.ActiveView.Redraw()
    except Exception as ex:
        print("[KAMERA] set cardinal:", ex)


def set_top_view(vp):
    """Plan-Ansicht (oben), rotiert nach Norden-Setting."""
    if vp is None: return
    doc = Rhino.RhinoDoc.ActiveDoc
    if doc is None: return
    try:
        target, diag = _scene_target_and_diag(doc)
        loc = rg.Point3d(target.X, target.Y, target.Z + diag * 2)
        if not vp.IsParallelProjection:
            vp.ChangeToParallelProjection(True)
        vp.SetCameraLocations(target, loc)
        # Plan-Norden zeigt nach oben im Viewport → Up-Vector = north
        north_deg = get_north_angle(doc)
        nrad = math.radians(north_deg)
        try:
            vp.CameraUp = rg.Vector3d(math.sin(nrad), math.cos(nrad), 0)
        except Exception: pass
        try: vp.ZoomExtents()
        except Exception: pass
        Rhino.RhinoDoc.ActiveDoc.Views.ActiveView.Redraw()
    except Exception as ex:
        print("[KAMERA] set top:", ex)


def _read_viewport(vp):
    """Liest den aktuellen Zustand eines Viewports als dict."""
    if vp is None: return None
    try:
        loc = vp.CameraLocation
        tgt = vp.CameraTarget
        is_par = bool(vp.IsParallelProjection)
        # FOV in Grad (vertical) — gilt nur fuer Perspective
        try:
            fov_v = float(vp.Camera35mmLensLength)  # Linsen-Brennweite mm
        except Exception:
            fov_v = 50.0
        # Frustum-Breite (m bei m-Doc) — gilt nur fuer Parallel
        try:
            f = vp.GetFrustum()
            # GetFrustum returns (bool ok, l, r, b, t, n, f)
            ok = bool(f[0]) if isinstance(f, tuple) else False
            if ok:
                _l = f[1]; _r = f[2]
                frustum_w = abs(_r - _l)
            else:
                frustum_w = 0.0
        except Exception:
            frustum_w = 0.0
        # Distanz Kamera→Target
        dx = loc.X - tgt.X; dy = loc.Y - tgt.Y; dz = loc.Z - tgt.Z
        dist = math.sqrt(dx*dx + dy*dy + dz*dz)
        return {
            "name":      vp.Name or "",
            "parallel":  is_par,
            "loc":       [loc.X, loc.Y, loc.Z],
            "target":    [tgt.X, tgt.Y, tgt.Z],
            "lensMm":    fov_v,
            "frustumW":  frustum_w,
            "distance":  dist,
        }
    except Exception as ex:
        print("[KAMERA] read viewport:", ex)
        return None


def _active_viewport():
    try:
        v = Rhino.RhinoDoc.ActiveDoc.Views.ActiveView
        return v.ActiveViewport if v else None
    except Exception:
        return None


def _set_viewport(vp, data):
    """Schreibt Position/Target/Projektion/Linse zurueck."""
    if vp is None or not isinstance(data, dict): return
    try:
        # Projektion zuerst — danach Frustum/Linse konsistent
        if "parallel" in data:
            par = bool(data.get("parallel"))
            if par != bool(vp.IsParallelProjection):
                if par: vp.ChangeToParallelProjection(True)
                else:   vp.ChangeToPerspectiveProjection(True, 50.0)
        loc_cur = vp.CameraLocation
        tgt_cur = vp.CameraTarget
        loc_arr = data.get("loc")
        tgt_arr = data.get("target")
        if isinstance(loc_arr, list) and len(loc_arr) == 3:
            loc_cur = rg.Point3d(float(loc_arr[0]), float(loc_arr[1]), float(loc_arr[2]))
        if isinstance(tgt_arr, list) and len(tgt_arr) == 3:
            tgt_cur = rg.Point3d(float(tgt_arr[0]), float(tgt_arr[1]), float(tgt_arr[2]))
        vp.SetCameraLocations(tgt_cur, loc_cur)
        # Linse / Frustum
        if not vp.IsParallelProjection and "lensMm" in data:
            try:
                lens = float(data.get("lensMm") or 50.0)
                vp.Camera35mmLensLength = lens
            except Exception: pass
        if vp.IsParallelProjection and "frustumW" in data:
            try:
                w = float(data.get("frustumW") or 0.0)
                if w > 0:
                    # Rhino hat keine direkte SetFrustumWidth — wir nutzen
                    # SetViewProjection-Hack via SetFrustum (l, r, b, t, n, f)
                    cur = vp.GetFrustum()
                    if isinstance(cur, tuple) and len(cur) >= 7 and cur[0]:
                        l_cur, r_cur, b_cur, t_cur, n_cur, f_cur = cur[1], cur[2], cur[3], cur[4], cur[5], cur[6]
                        cur_w = abs(r_cur - l_cur)
                        if cur_w > 1e-9:
                            ratio = w / cur_w
                            mid_lr = (l_cur + r_cur) / 2.0
                            mid_bt = (b_cur + t_cur) / 2.0
                            half_w = w / 2.0
                            half_h = abs(t_cur - b_cur) / 2.0 * ratio
                            vp.SetFrustum(mid_lr - half_w, mid_lr + half_w,
                                          mid_bt - half_h, mid_bt + half_h,
                                          n_cur, f_cur)
            except Exception as ex:
                print("[KAMERA] frustum set:", ex)
        try:
            Rhino.RhinoDoc.ActiveDoc.Views.ActiveView.Redraw()
        except Exception: pass
    except Exception as ex:
        print("[KAMERA] set viewport:", ex)


def _set_iso(vp, octant="NE"):
    """Setzt eine standard-architektonische Iso-Ansicht (35.26° vertikal,
    45° horizontal). octant: 'NE' | 'NW' | 'SE' | 'SW' — die XY-Diagonale
    relativ zum Norden des Projekts (= rotiert mit dossier_north_angle)."""
    if vp is None: return
    doc = Rhino.RhinoDoc.ActiveDoc
    if doc is None: return
    try:
        target, diag = _scene_target_and_diag(doc)
        # Octant-Basisvektor (vor Norden-Rotation): NE = (+1,+1)
        sign_e = 1 if "E" in octant.upper() else -1
        sign_n = 1 if "N" in octant.upper() else -1
        north_deg = get_north_angle(doc)
        nrad = math.radians(north_deg)
        # Norden-Vektor + Osten-Vektor im Welt-Koordinatensystem
        north_vec = (math.sin(nrad), math.cos(nrad))
        east_vec  = (math.cos(nrad), -math.sin(nrad))
        # Iso-XY-Richtung = sign_e * east + sign_n * north
        dx = sign_e * east_vec[0] + sign_n * north_vec[0]
        dy = sign_e * east_vec[1] + sign_n * north_vec[1]
        dz = 1.0
        L = math.sqrt(dx*dx + dy*dy + dz*dz)
        dist = diag * 1.6
        loc = rg.Point3d(target.X + dx/L * dist,
                          target.Y + dy/L * dist,
                          target.Z + dz/L * dist)
        if not vp.IsParallelProjection:
            vp.ChangeToParallelProjection(True)
        vp.SetCameraLocations(target, loc)
        try: vp.ZoomExtents()
        except Exception: pass
        Rhino.RhinoDoc.ActiveDoc.Views.ActiveView.Redraw()
    except Exception as ex:
        print("[KAMERA] set iso:", ex)


def _load_presets(doc):
    try:
        raw = doc.Strings.GetValue(_PRESETS_KEY)
        if not raw: return []
        items = json.loads(raw)
        return items if isinstance(items, list) else []
    except Exception:
        return []


def _save_presets(doc, items):
    try:
        doc.Strings.SetString(_PRESETS_KEY, json.dumps(items))
    except Exception as ex:
        print("[KAMERA] save presets:", ex)


def _payload():
    doc = Rhino.RhinoDoc.ActiveDoc
    vp = _active_viewport()
    return {
        "viewport":   _read_viewport(vp),
        "presets":    _load_presets(doc),
        "northAngle": get_north_angle(doc),
    }


class KameraBridge(panel_base.BaseBridge):
    def __init__(self):
        panel_base.BaseBridge.__init__(self, "kamera")

    def _on_ready(self):
        self._send_state()

    def _send_state(self):
        self.send("STATE", _payload())

    def handle(self, data):
        if not isinstance(data, dict): return
        t = data.get("type", "")
        p = data.get("payload") or {}
        if not isinstance(p, dict): p = {}
        doc = Rhino.RhinoDoc.ActiveDoc

        if t == "READY" or t == "REQUEST_STATE":
            self._on_ready()
        elif t == "SET_VIEWPORT":
            vp = _active_viewport()
            _set_viewport(vp, p)
            self._send_state()
        elif t == "SET_ISO":
            vp = _active_viewport()
            _set_iso(vp, p.get("octant") or "NE")
            self._send_state()
        elif t == "SET_NORTH_ANGLE":
            set_north_angle(Rhino.RhinoDoc.ActiveDoc, p.get("angle") or 0)
            self._send_state()
            # Topbar refreshen damit dort der neue Winkel sichtbar ist
            try:
                b = sc.sticky.get("oberleiste_bridge")
                if b is not None: b._send_state(force=True)
            except Exception: pass
        elif t == "SET_PROJECTION":
            vp = _active_viewport()
            if vp is not None:
                par = bool(p.get("parallel"))
                if par: vp.ChangeToParallelProjection(True)
                else:   vp.ChangeToPerspectiveProjection(True, 50.0)
                try: Rhino.RhinoDoc.ActiveDoc.Views.ActiveView.Redraw()
                except Exception: pass
            self._send_state()
        elif t == "ZOOM_EXTENTS":
            vp = _active_viewport()
            if vp is not None:
                try: vp.ZoomExtents()
                except Exception: pass
                try: Rhino.RhinoDoc.ActiveDoc.Views.ActiveView.Redraw()
                except Exception: pass
            self._send_state()
        elif t == "SAVE_PRESET":
            name = (p.get("name") or "").strip() or "Preset"
            vp = _active_viewport()
            state = _read_viewport(vp)
            if state is None: return
            items = _load_presets(doc)
            entry = {
                "id":       "kp_" + uuid.uuid4().hex[:8],
                "name":     name,
                "parallel": state["parallel"],
                "loc":      state["loc"],
                "target":   state["target"],
                "lensMm":   state["lensMm"],
                "frustumW": state["frustumW"],
            }
            items.append(entry)
            _save_presets(doc, items)
            self._send_state()
        elif t == "APPLY_PRESET":
            pid = p.get("id")
            items = _load_presets(doc)
            entry = next((x for x in items if x.get("id") == pid), None)
            if entry is None: return
            vp = _active_viewport()
            _set_viewport(vp, entry)
            self._send_state()
        elif t == "DELETE_PRESET":
            pid = p.get("id")
            items = [x for x in _load_presets(doc) if x.get("id") != pid]
            _save_presets(doc, items)
            self._send_state()


def open_as_window():
    """Oeffnet KAMERA als Eto-Form + WebView (analog Overrides)."""
    b = KameraBridge()
    sc.sticky["kamera_bridge"] = b
    panel_base.open_satellite_window(
        "kamera",
        title="Kamera",
        size=(420, 600),
        bridge=b)