import json
import os
from shutil import copytree
from pathlib import Path, PurePath
import subprocess

from jinja2 import Template, Environment, PackageLoader, select_autoescape
import webvtt


class VideoPage:
    THUMBNAIL_GEOMETRY = '200x200'

    def __init__(self, path):
        self.name = path.name
        self.original = None
        self.author = None
        self.path = path
        self.video = None
        self.vtt = None
        self.srt = None
        self.ass = None
        self.cover = None
        self.thumbnail = None
        self.files = []
        self.search_media()

    def search_media(self):
        for entry in self.path.iterdir():
            if entry.name == 'metadata.json':
                with entry.open('r') as metadatafile:
                    self.metadata = json.load(metadatafile)
                if 'name' in self.metadata:
                    self.name = self.metadata['name']
                if 'original' in self.metadata:
                    self.original = self.metadata['original']
                if 'author' in self.metadata:
                    self.author = self.metadata['author']
            elif entry.name.endswith('mp4'):
                self.video = entry
                self.files.append(entry)
            elif entry.name.endswith('vtt'):
                self.vtt = entry
            elif entry.name.endswith('srt'):
                self.srt = entry
                self.files.append(entry)
            elif entry.name.endswith('ass'):
                self.ass = entry
                self.files.append(entry)
            elif entry.name.endswith('_thumbnail.jpg'):
                self.thumbnail = entry
            elif entry.name.endswith('jpg'):
                self.cover = entry
            elif entry.name == 'index.html':
                continue
            else:
                self.files.append(entry)

        if self.vtt is None and self.srt is not None:
            srtfile = self.path / self.srt
            self.vtt = self.path / "{}.vtt".format(self.path.name)
            webvtt.from_srt(str(self.srt.absolute())).save(str(self.vtt.absolute()))

        if self.cover is None and self.video is not None:
            self.cover = self.path / "{}.jpg".format(self.name)
            command = [
                'ffmpeg',
                '-loglevel', 'quiet',
                '-i', str(self.video.absolute()),
                '-vcodec', 'mjpeg',
                '-vframes', '1',
                '-an',
                '-f', 'rawvideo',
                '-ss', '2',
                str(self.cover.absolute()),
            ]
            subprocess.check_call(command)

        if self.thumbnail is None and self.cover is not None:
            self.thumbnail = self.path / "{}_thumbnail.jpg".format(self.name)
            subprocess.check_call([
                'convert',
                str(self.cover.absolute()),
                '-resize', self.THUMBNAIL_GEOMETRY,
                str(self.thumbnail.absolute()),
            ])

    def get_context_data(self):
        return {
            'video': self,
        }

    def render(self, builder, context):
        ctx = self.get_context_data()
        ctx.update(context)
        builder.render('video.html', self.path, ctx)


class Builder:
    def __init__(self, root_folder, root_path=PurePath('/')):
        self.root_folder = root_folder
        self.root_path = root_path
        self.static_dir = Path(__file__).parent / 'static'

        self.env = Environment(
            loader=PackageLoader('negromateweb', 'templates'),
            autoescape=select_autoescape(['html']),
        )
        self.env.filters['url'] = self.url

    def url(self, path):
        return self.root_path / path.relative_to(self.root_folder)

    def render(self, template, target, context):
        html_file = target / 'index.html'
        page_template = self.env.get_template(template)

        with html_file.open('w') as page:
            page.write(page_template.render(context))

    def build(self):
        videos = []
        for entry in self.root_folder.iterdir():
            if entry.name == 'static':
                continue
            if entry.is_dir():
                print("building {}".format(entry.name))
                try:
                    videopage = VideoPage(entry)
                except Exception as e:
                    raise e
                    print("Error: {}".format(e))
                    continue
                videos.append(videopage)

        global_context = {
            'videos': videos,
            'root_path': self.root_path,
        }

        for video in videos:
            video.render(self, global_context)

        self.render('home.html', self.root_folder, global_context)

        static = self.root_folder / 'static'

        if not static.exists():
            path.mkdir()

        subprocess.check_call([
            'rsync',
            '-ra',
            str(self.static_dir),
            str(self.root_folder.absolute()),
        ])