# Chris Xiong 2024
# License: Expat (MIT)

import os
import sys
import time
import shutil
import tempfile
import subprocess
from datetime import datetime, timezone

import postutil
from atomgen import gen_atom
from monolith import Monolith
from config import conf

'''
Launches an editor (set by $EDITOR) to edit the given file
'''
def edit_file(fn):
    editor = os.environ["EDITOR"]
    subprocess.run([editor, fn])

'''
Opens an editor to create a new post.
The post will be formated, and all media will be processed accordingly.
'''
def new_post():
    conf.require()
    with tempfile.TemporaryDirectory() as dir:
        fn = os.path.join(dir, "note.txt")
        with open(fn, "w"): pass
        edit_file(fn)
        ts = time.time_ns() // 10 ** 9
        if len(sys.argv) >= 3:
            dt = datetime.fromisoformat(sys.argv[2])
            ts = int(dt.timestamp())
        postpath = postutil.move_post(fn, ts)
        p = postutil.process_post(postpath, False)
        if len(p.content) == 0 and len(p.media) == 0:
            print("No post was made.")
            return
        print(f"Post {os.path.basename(postpath)} made!")
        m = Monolith(os.path.join(conf.LOCAL_DATA_ROOT, "posts.monolith"))
        m.append(p)
        m.load_index()
        m.generate_page_index()
        if conf.ATOM_ENABLED:
            gen_atom()

'''
Opens an editor to edit an existing post.
Post time cannot be modified and will always stay the same.
Media that can be found in the media_dropoff folder will be updated.

If a media entry is modified, the file it refers to must either be
present in the media_dropoff folder, or already in the corresponding
folder inside media_orig.
'''
def edit_post(ts):
    conf.require()
    m = Monolith(os.path.join(conf.LOCAL_DATA_ROOT, "posts.monolith"))
    m.load_index()
    if m.get_post(ts) is None:
        print("No post was made at that time!")
        # TODO: allow the user to select a post made near this time
        return
    d = datetime.fromtimestamp(ts, tz=timezone.utc)
    pfn = f"{ts}-{d.isoformat()[:-6]}Z.post"
    rp = os.path.join(os.path.join("posts", str(d.year)), pfn)
    edit_file(os.path.join(conf.LOCAL_DATA_ROOT, rp))
    p = postutil.process_post(rp, True)
    m.replace_post(ts, p)
    m.generate_page_index()
    if conf.ATOM_ENABLED:
        gen_atom()

'''
Regenerate the ENTIRE monolith file.
Horribly slow.
'''
def regen_monolith():
    conf.require()
    print("Do you want to regenerate the ENTIRE monolith file? [y/n]")
    if input() not in ['Y', 'y']:
        return
    m = Monolith(os.path.join(conf.LOCAL_DATA_ROOT, "posts.monolith"))
    m.clear()
    postlist = []
    postsp = os.path.join(conf.LOCAL_DATA_ROOT, "posts")
    for ye in os.scandir(postsp):
        inty = None
        try:
            inty = int(ye.name)
        except ValueError:
            pass
        if inty is None or not ye.is_dir():
            continue
        yearp = os.path.join(postsp, ye.name)
        postlist += [os.path.join(yearp, p) for p in filter(lambda x: x.endswith(".post"), os.listdir(yearp))]
    def keyf(x):
        b = os.path.basename(x)
        return int(b[:b.index('-')])
    postlist = sorted(postlist, key=keyf)
    for pfn in postlist:
        p = postutil.process_post(pfn, True)
        m.append(p)
    m.load_index()
    m.generate_page_index()
    if conf.ATOM_ENABLED:
        gen_atom()

'''
Sync all local data to the configured remote host for serving.
'''
def sync_remote():
    conf.require()
    subprocess.run(["rsync", "-rLptgoDzv", "--exclude=posts", "--exclude=media_dropoff", conf.LOCAL_DATA_ROOT + "/", conf.SYNC_TARGET])

'''
Create a new notekins instance with all files and directories that it expects.
'''
def init_instance():
    repop = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
    print(repop)
    if len(sys.argv) < 3:
        print("Missing path to the new instance.")
        return
    targetp = sys.argv[2].rstrip('/')
    os.mkdir(targetp, mode=0o755)
    os.mkdir(os.path.join(targetp, "posts"), mode=0o755)
    os.mkdir(os.path.join(targetp, "emotes"), mode=0o755)
    os.mkdir(os.path.join(targetp, "media_dropoff"), mode=0o755)
    os.mkdir(os.path.join(targetp, "media_orig"), mode=0o755)
    os.mkdir(os.path.join(targetp, "media_thmb"), mode=0o755)
    shutil.copytree(os.path.join(repop, "template"), os.path.join(targetp, "template"))
    with open(os.path.join(targetp, "notekins.conf"), "w") as f:
        f.write(f"LOCAL_DATA_ROOT={targetp}")
    m = Monolith(os.path.join(targetp, "posts.monolith"))
    m.clear()

'''
Clean up any media file that isn't used in the monolith file.
TODO.
'''
def media_cleanup():
    conf.require()
    pass

def main():
    if len(sys.argv) < 2:
        print("Missing command. Available commands:")
        print("new    Create a new post.")
        print("edit   Edit an existing post. Requires a post timestamp.")
        print("atom   Generate atom feed.")
        print("regen  Regenerate the entire monolith file.")
        print("sync   Sync data to remote for hosting.")
        print("init   Initialize a new Notekins instance. Requires path to the instance.")
        print("dump   Dump the content of the monolith file.")
        return
    match sys.argv[1]:
        case "new":
            new_post()
        case "edit":
            edit_post(int(sys.argv[2]))
        case "atom":
            gen_atom()
        case "regen":
            regen_monolith()
        case "sync":
            sync_remote()
        case "init":
            init_instance()
        case "dump":
            m = Monolith(os.path.join(conf.LOCAL_DATA_ROOT, "posts.monolith"))
            m.load_index()
            for d in m.get_all_dates():
                m.get_post(d).dump()

if __name__ == "__main__":
    main()