#!/usr/bin/env python3
import hashlib
import json
import os
import pathlib
import sys
import tempfile

import bpy


OBJECT_NAME = "WebGapAnimatedTransformConstraintObject"
ACTION_NAME = "WebGapAnimatedTransformConstraintAction"
CONSTRAINT_NAME = "WebGapAnimatedTransformConstraint"
OLD_PATH = f'constraints["{CONSTRAINT_NAME}"].from_min_x'
NEW_PATH = f'constraints["{CONSTRAINT_NAME}"].from_min_x_rot'


def action_fcurves(obj):
    action = obj.animation_data.action if obj.animation_data else None
    if action is None:
        raise RuntimeError("update_animated_transform_constraints action is missing")
    curves = []
    for layer in action.layers:
        for strip in layer.strips:
            for channelbag in strip.channelbags:
                curves.extend(channelbag.fcurves)
    return curves


def state_report():
    obj = bpy.data.objects.get(OBJECT_NAME)
    if obj is None or obj.animation_data is None:
        raise RuntimeError("update_animated_transform_constraints object animation is missing")
    constraint = obj.constraints.get(CONSTRAINT_NAME)
    if constraint is None:
        raise RuntimeError("update_animated_transform_constraints Transform constraint is missing")
    return {
        "object": obj.name,
        "action": obj.animation_data.action.name if obj.animation_data.action else None,
        "constraint": constraint.name,
        "mapFrom": constraint.map_from,
        "channels": [
            {
                "path": curve.data_path,
                "index": int(curve.array_index),
                "frames": [float(key.co.x) for key in curve.keyframe_points],
                "values": [float(key.co.y) for key in curve.keyframe_points],
            }
            for curve in action_fcurves(obj)
        ],
    }


def run_operator():
    poll = bool(bpy.ops.anim.update_animated_transform_constraints.poll())
    if not poll:
        raise RuntimeError("ANIM_OT_update_animated_transform_constraints poll failed")
    result = bpy.ops.anim.update_animated_transform_constraints(use_convert_to_radians=True)
    if result != {"FINISHED"}:
        raise RuntimeError(f"ANIM_OT_update_animated_transform_constraints returned {result}")
    return poll, result


def main():
    arguments = sys.argv[sys.argv.index("--") + 1 :]
    if len(arguments) != 2:
        raise SystemExit("usage: blender -b --factory-startup --python check-action-update-animated-transform-constraints-desktop.py -- FIXTURE REPORT")
    fixture, output = (pathlib.Path(value).resolve() for value in arguments)
    bpy.ops.wm.open_mainfile(filepath=str(fixture), load_ui=False)
    before = state_report()
    if before["action"] != ACTION_NAME or len(before["channels"]) != 1 or before["channels"][0]["path"] not in {OLD_PATH, NEW_PATH}:
        raise RuntimeError(f"unexpected update_animated_transform_constraints source state: {before}")
    poll, result = run_operator()
    after = state_report()
    if after["action"] != ACTION_NAME or after["mapFrom"] != "ROTATION" or len(after["channels"]) != 1:
        raise RuntimeError(f"update_animated_transform_constraints produced unexpected state: {after}")
    channel = after["channels"][0]
    if channel["path"] != NEW_PATH or channel["frames"] != [1.0, 10.0] or channel["values"] != [-30.0, 60.0]:
        raise RuntimeError(f"update_animated_transform_constraints path/value drift: {after}")
    descriptor, temporary = tempfile.mkstemp(prefix="m16-anim-update-transform-constraints-reopen-", suffix=".blend")
    os.close(descriptor)
    temporary_path = pathlib.Path(temporary)
    try:
        bpy.ops.wm.save_as_mainfile(filepath=str(temporary_path), check_existing=False, compress=True)
        bpy.ops.wm.open_mainfile(filepath=str(temporary_path), load_ui=False)
        reopened = state_report()
        if reopened != after:
            raise RuntimeError(f"anim.update_animated_transform_constraints save/reopen drift: {after} != {reopened}")
        if before["channels"][0]["path"] == OLD_PATH:
            bpy.ops.wm.save_as_mainfile(filepath=str(fixture), check_existing=False, compress=True)
        if not output.exists():
            report = {
                "schemaVersion": 1,
                "task": "M16-GAP-00212",
                "operation": "ANIM_UPDATE_ANIMATED_TRANSFORM_CONSTRAINTS_DESKTOP",
                "fixture": str(fixture),
                "fixtureSha256": hashlib.sha256(fixture.read_bytes()).hexdigest(),
                "before": before,
                "after": reopened,
                "useConvertToRadians": True,
                "poll": poll,
                "operatorStatus": "FINISHED",
                "mainMutation": "TRANSFORM_CONSTRAINT_PATHS_UPDATED",
                "saveReopen": "EXACT",
                "blenderVersion": bpy.app.version_string,
            }
            output.parent.mkdir(parents=True, exist_ok=True)
            output.write_text(json.dumps(report, indent=2, sort_keys=True) + "\n", encoding="utf-8")
        print("anim-update-animated-transform-constraints-desktop-ok poll=true status=FINISHED mainMutation=transform_constraint_paths_updated saveReopen=exact")
    finally:
        temporary_path.unlink(missing_ok=True)


if __name__ == "__main__":
    try:
        main()
    except Exception as error:
        print(f"anim-update-animated-transform-constraints-desktop-failed: {error}")
        raise SystemExit(1)