"""
This example demonstrates creating DNA from scratch.
- usage in command line:
    - call without arguments:
        python dna_demo.py
        mayapy dna_demo.py

        Expected: Script will generate CustomDNA.dna in OUTPUT_DIR.
        NOTE: If OUTPUT_DIR does not exist, it will be created.

    - call with arguments:
        python dna_demo.py --dna_path=<PATH TO NEW DNA FILE>
        mayapy dna_demo.py --dna_path=<PATH TO NEW DNA FILE>

        Expected: script will generate <PATH TO NEW DNA FILE>.
        NOTE: The directory referenced by the given path must exist. If the directory does not exist, the script is going to fail.

- usage in Maya:
    1. copy whole content of this file to Maya Script Editor
    2. delete "if __name__ == "__main__":
            main()"
    3. delete whole "def main" method
    4. change value of ROOT_DIR to absolute path of dna_calibration, e.g. `c:/dna_calibration` in Windows or `/home/user/dna_calibration`. Important:
    Use `/` (forward slash), because Maya uses forward slashes in path.
    5. call method create_new_dna(<PATH TO NEW DNA FILE>)

    Expected: script will generate <PATH TO NEW DNA FILE>.
    NOTE: The directory referenced by the given path must exist. If the directory does not exist, the script is going to fail.

NOTE: If running on Linux, please make sure to append the LD_LIBRARY_PATH with absolute path to the lib/linux directory before running the example:
    export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:<path-to-lib-linux-dir>
"""


import argparse
from os import environ, makedirs
from os import path as ospath
from sys import path as syspath
from sys import platform

# if you use Maya, use absolute path
ROOT_DIR = f"{ospath.dirname(ospath.abspath(__file__))}/..".replace("\\", "/")
OUTPUT_DIR = f"{ROOT_DIR}/output"
ROOT_LIB_DIR = f"{ROOT_DIR}/lib"
if platform == "win32":
    LIB_DIR = f"{ROOT_LIB_DIR}/windows"
elif platform == "linux":
    LIB_DIR = f"{ROOT_LIB_DIR}/linux"
else:
    raise OSError(
        "OS not supported, please compile dependencies and add value to LIB_DIR"
    )

# Add bin directory to maya plugin path
if "MAYA_PLUG_IN_PATH" in environ:
    separator = ":" if platform == "linux" else ";"
    environ["MAYA_PLUG_IN_PATH"] = separator.join([environ["MAYA_PLUG_IN_PATH"], LIB_DIR])
else:
    environ["MAYA_PLUG_IN_PATH"] = LIB_DIR

# Adds directories to path
syspath.insert(0, ROOT_DIR)
syspath.insert(0, LIB_DIR)

from dna import DataLayer_All, FileStream, Status, BinaryStreamReader, BinaryStreamWriter


def create_dna(path):
    stream = FileStream(path, FileStream.AccessMode_Write, FileStream.OpenMode_Binary)
    writer = BinaryStreamWriter(stream)

    # Sets a couple of parameters about in the dna that is about to be created and written to
    writer.setName("rig name")
    writer.setLODCount(4)
    writer.setJointName(0, "spine")
    writer.setJointName(1, "neck")

    writer.setMeshName(0, "head")
    writer.setVertexPositions(0, [[0.0, 0.5, 0.3], [1.0, 3.0, -8.0]])
    writer.setVertexTextureCoordinates(0, [[0.25, 0.55], [1.5, 3.6]])

    # Creates the DNA
    writer.write()
    if not Status.isOk():
        status = Status.get()
        raise RuntimeError(f"Error saving DNA: {status.message}")


def load_dna(path):
    stream = FileStream(path, FileStream.AccessMode_Read, FileStream.OpenMode_Binary)
    reader = BinaryStreamReader(stream, DataLayer_All)
    reader.read()
    if not Status.isOk():
        status = Status.get()
        raise RuntimeError(f"Error loading DNA: {status.message}")
    return reader


def print_dna_summary(dna_reader):
    print(f"Name: {dna_reader.getName()}")
    print(f"Joint count: {dna_reader.getJointCount()}")
    joint_names = ", ".join(
        dna_reader.getJointName(i) for i in range(dna_reader.getJointCount())
    )
    print(f"Joint names: {joint_names}")

    for mesh_idx in range(dna_reader.getMeshCount()):
        # Get vertices one by one
        for vtx_id in range(dna_reader.getVertexPositionCount(mesh_idx)):
            vtx = dna_reader.getVertexPosition(mesh_idx, vtx_id)
            print(f"Mesh {mesh_idx} - Vertex {vtx_id} : {vtx}")
        # Get all X / Y / Z coordinates
        print(dna_reader.getVertexPositionXs(mesh_idx))
        print(dna_reader.getVertexPositionYs(mesh_idx))
        print(dna_reader.getVertexPositionZs(mesh_idx))

        for tc_idx in range(dna_reader.getVertexTextureCoordinateCount(mesh_idx)):
            tex_coord = dna_reader.getVertexTextureCoordinate(mesh_idx, tc_idx)
            print(f"Mesh {mesh_idx} - Texture coordinate {tc_idx} : {tex_coord}")


def create_new_dna(dna_path):
    create_dna(dna_path)
    dna_reader = load_dna(dna_path)
    print_dna_summary(dna_reader)


def main():
    parser = argparse.ArgumentParser(description="DNA demo")
    parser.add_argument(
        "--dna_path", metavar="--dna_path", help="Path where to save the DNA file", default=f"{OUTPUT_DIR}/CustomDNA.dna"
    )
    makedirs(OUTPUT_DIR, exist_ok=True)
    args = parser.parse_args()

    create_new_dna(args.dna_path)


if __name__ == "__main__":
    main()