#!/usr/bin/env python3
# SPDX-FileCopyrightText: 2015-2022 Blender Authors
#
# SPDX-License-Identifier: Apache-2.0

import argparse
import os
import pathlib
import subprocess
import sys
from pathlib import Path


def setup():
    import bpy

    for scene in bpy.data.scenes:
        scene.render.engine = 'BLENDER_EEVEE_NEXT'

        # Enable Eevee features
        eevee = scene.eevee

        # Overscan of 50 will doesn't offset the final image, and adds more information for screen based ray tracing.
        eevee.use_overscan = True
        eevee.overscan_size = 50.0

        # Ambient Occlusion Pass
        eevee.gtao_distance = 1

        # Hair
        scene.render.hair_type = 'STRIP'

        # Volumetric
        eevee.volumetric_tile_size = '2'
        eevee.volumetric_start = 1.0
        eevee.volumetric_end = 50.0
        eevee.volumetric_samples = 128
        eevee.use_volumetric_shadows = True

        # Motion Blur
        if scene.render.use_motion_blur:
            eevee.motion_blur_steps = 10

        # Ray-tracing
        eevee.use_raytracing = True
        eevee.ray_tracing_method = 'SCREEN'
        ray_tracing = eevee.ray_tracing_options
        ray_tracing.resolution_scale = "1"
        ray_tracing.screen_trace_quality = 1.0
        ray_tracing.screen_trace_thickness = 1.0

        # Light-probes
        eevee.gi_cubemap_resolution = '256'

        # Only include the plane in probes
        for ob in scene.objects:
            if ob.name != 'Plane' and ob.type != 'LIGHT':
                ob.hide_probe_volume = True
                ob.hide_probe_sphere = True
                ob.hide_probe_plane = True

        # Does not work in edit mode
        if bpy.context.mode == 'OBJECT':
            # Simple probe setup
            bpy.ops.object.lightprobe_add(type='SPHERE', location=(0.0, 0.0, 1.0))
            cubemap = bpy.context.selected_objects[0]
            cubemap.scale = (5.0, 5.0, 2.0)
            cubemap.data.falloff = 0.0
            cubemap.data.clip_start = 0.8
            cubemap.data.influence_distance = 1.2

            bpy.ops.object.lightprobe_add(type='VOLUME', location=(0.0, 0.0, 2.0))
            grid = bpy.context.selected_objects[0]
            grid.scale = (8.0, 4.5, 4.5)
            grid.data.grid_resolution_x = 32
            grid.data.grid_resolution_y = 16
            grid.data.grid_resolution_z = 8
            grid.data.grid_bake_samples = 128
            grid.data.grid_capture_world = True
            grid.data.surfel_density = 10.0
            # Make lighting smoother for most of the case.
            grid.data.grid_dilation_threshold = 1.0
            bpy.ops.object.lightprobe_cache_bake(subset='ACTIVE')


# When run from inside Blender, render and exit.
try:
    import bpy
    inside_blender = True
except ImportError:
    inside_blender = False

if inside_blender:
    try:
        setup()
    except Exception as e:
        print(e)
        sys.exit(1)


def get_gpu_device_type(blender):
    # TODO: This always fails.
    command = [
        blender,
        "--background",
        "--factory-startup",
        "--python",
        str(pathlib.Path(__file__).parent / "gpu_info.py")
    ]
    try:
        completed_process = subprocess.run(command, stdout=subprocess.PIPE)
        for line in completed_process.stdout.read_text():
            if line.startswith("GPU_DEVICE_TYPE:"):
                vendor = line.split(':')[1]
                return vendor
    except BaseException as e:
        return None
    return None


def get_arguments(filepath, output_filepath):
    return [
        "--background",
        "--factory-startup",
        "--enable-autoexec",
        "--debug-memory",
        "--debug-exit-on-error",
        filepath,
        "-E", "BLENDER_EEVEE_NEXT",
        "-P",
        os.path.realpath(__file__),
        "-o", output_filepath,
        "-F", "PNG",
        "-f", "1"]


def create_argparse():
    parser = argparse.ArgumentParser()
    parser.add_argument("-blender", nargs="+")
    parser.add_argument("-testdir", nargs=1)
    parser.add_argument("-outdir", nargs=1)
    parser.add_argument("-oiiotool", nargs=1)
    parser.add_argument('--batch', default=False, action='store_true')
    parser.add_argument('--fail-silently', default=False, action='store_true')
    return parser


def main():
    parser = create_argparse()
    args = parser.parse_args()

    blender = args.blender[0]
    test_dir = args.testdir[0]
    oiiotool = args.oiiotool[0]
    output_dir = args.outdir[0]

    gpu_device_type = get_gpu_device_type(blender)
    reference_override_dir = None
    if gpu_device_type == "AMD":
        reference_override_dir = "eevee_next_renders/amd"

    from modules import render_report
    report = render_report.Report("Eevee Next", output_dir, oiiotool)
    report.set_pixelated(True)
    report.set_engine_name('eevee_next')
    report.set_reference_dir("eevee_next_renders")
    report.set_reference_override_dir(reference_override_dir)
    report.set_compare_engine('cycles', 'CPU')

    test_dir_name = Path(test_dir).name
    if test_dir_name.startswith('image'):
        report.set_fail_threshold(0.051)

    ok = report.run(test_dir, blender, get_arguments, batch=args.batch, fail_silently=args.fail_silently)
    sys.exit(not ok)


if not inside_blender and __name__ == "__main__":
    main()