import os
import subprocess

import ox

import itemlist.models
import item.models

from .render_kdenlive import KDEnliveProject, _CACHE
from .render import default_prefix as root

def render_music():
    pass

def render_forest():
    # Stereo Mix, playing on 5.1 rear left/right
    project = KDEnliveProject(root)
    qs = item.models.Item.objects.filter(
        data__type__icontains='Forest'
    ).order_by('sort__title')

    for clip in qs:
        src = clip.files.all()[0].data.path
        project.append_clip('A1', {
            "src": src,
            "duration": clip.sort.duration,
            "filter": {
            },
        })

    path = os.path.join(root, "forest.kdenlive")
    with open(path, 'w') as fd:
        fd.write(project.to_xml())

    cmds = []
    cmds.append([
        "melt", "forest.kdenlive", '-quiet', '-consumer', 'avformat:forest.wav'
    ])
    info = ox.avinfo('forest.wav')
    cmds.append([
        "ffmpeg", "-y",
        "-nostats", "-loglevel", "error",
        "-f", "lavfi", "-i", "anullsrc=r=48000:cl=mono",
        "-t", str(info["duration"]),
        "forest_silence.wav"
    ])

    for src, out1, out2 in (
        ('forest.wav', "forest_left.wav", "forest_right.wav"),
    ):
        cmds.append([
            "ffmpeg", "-y",
            "-nostats", "-loglevel", "error",
            "-i", src,
            "-filter_complex",
            "[0:0]pan=1|c0=c0[left]; [0:0]pan=1|c0=c1[right]",
            "-map", "[left]", out1,
            "-map", "[right]", out2,
        ])

    cmds.append([
        "ffmpeg", "-y",
        "-nostats", "-loglevel", "error",
        "-i", "silence.wav",
        "-i", "silence.wav",
        "-i", "silence.wav",
        "-i", "silence.wav",
        "-i", "forest_left.wav",
        "-i", "forest_right.wav",
        "-filter_complex", "[0:a][1:a][2:a][3:a][4:a][5:a]amerge=inputs=6[a]",
        "-map", "[a]",
        "-ar", "48000",
        "-c:a", "aac", "render/forest-5.1.mp4"
    ])
    os.chdir(root)
    for cmd in cmds:
        print(" ".join([str(x) for x in cmd]))
        subprocess.call(cmd)
    for name in (
        "forest.wav",
        "forest_left.wav",
        "forest_right.wav",
        "silence.wav",
    ):
        if os.path.exists(name):
            os.unlink(name)