import time
import hashlib
import re
import sys
import requests
import toml
import os
import glob
from datetime import datetime

STRATEGIES = ["latest_github_release", "latest_github_tag", "latest_github_commit"]

if "--commit-and-create-PR" not in sys.argv:
    dry_run = True
else:
    dry_run = False

args = [arg for arg in sys.argv[1:] if arg != "--commit-and-create-PR"]

if len(args):
    auth = None
else:
    GITHUB_LOGIN = (
        open(os.path.dirname(__file__) + "/../../.github_login").read().strip()
    )
    GITHUB_TOKEN = (
        open(os.path.dirname(__file__) + "/../../.github_token").read().strip()
    )
    GITHUB_EMAIL = (
        open(os.path.dirname(__file__) + "/../../.github_email").read().strip()
    )

    from github import Github, InputGitAuthor

    auth = (GITHUB_LOGIN, GITHUB_TOKEN)
    github = Github(GITHUB_TOKEN)
    author = InputGitAuthor(GITHUB_LOGIN, GITHUB_EMAIL)


def apps_to_run_auto_update_for():

    catalog = toml.load(open(os.path.dirname(__file__) + "/../../apps.toml"))

    apps_flagged_as_working_and_on_yunohost_apps_org = [
        app
        for app, infos in catalog.items()
        if infos["state"] == "working"
        and "/github.com/yunohost-apps" in infos["url"].lower()
    ]

    manifest_tomls = glob.glob(
        os.path.dirname(__file__) + "/../../.apps_cache/*/manifest.toml"
    )

    apps_with_manifest_toml = [path.split("/")[-2] for path in manifest_tomls]

    relevant_apps = list(
        sorted(
            set(apps_flagged_as_working_and_on_yunohost_apps_org)
            & set(apps_with_manifest_toml)
        )
    )

    out = []
    for app in relevant_apps:
        manifest = toml.load(
            os.path.dirname(__file__) + f"/../../.apps_cache/{app}/manifest.toml"
        )
        sources = manifest.get("resources", {}).get("sources", {})
        if any("autoupdate" in source for source in sources.values()):
            out.append(app)
    return out


def filter_and_get_latest_tag(tags, app_id):
    filter_keywords = ["start", "rc", "beta", "alpha"]
    tags = [t for t in tags if not any(keyword in t for keyword in filter_keywords)]

    tag_dict = {}
    for t in tags:
        t_to_check = t
        if t.startswith(app_id + "-"):
            t_to_check = t.split("-", 1)[-1]

        if not re.match(r"^v?[\d\.]*\d$", t_to_check):
            print(f"Ignoring tag {t_to_check}, doesn't look like a version number")
        else:
            tag_dict[t] = tag_to_int_tuple(t_to_check)

    tags = sorted(list(tag_dict.keys()), key=tag_dict.get)

    return tags[-1], ".".join([str(i) for i in tag_dict[tags[-1]]])


def tag_to_int_tuple(tag):

    tag = tag.strip("v")
    int_tuple = tag.split(".")
    assert all(i.isdigit() for i in int_tuple), f"Cant convert {tag} to int tuple :/"
    return tuple(int(i) for i in int_tuple)


def sha256_of_remote_file(url):
    print(f"Computing sha256sum for {url} ...")
    try:
        r = requests.get(url, stream=True)
        m = hashlib.sha256()
        for data in r.iter_content(8192):
            m.update(data)
        return m.hexdigest()
    except Exception as e:
        print(f"Failed to compute sha256 for {url} : {e}")
        return None


class AppAutoUpdater:
    def __init__(self, app_id, app_id_is_local_app_dir=False):

        if app_id_is_local_app_dir:
            if not os.path.exists(app_id + "/manifest.toml"):
                raise Exception("manifest.toml doesnt exists?")
            # app_id is in fact a path
            manifest = toml.load(open(app_id + "/manifest.toml"))

        else:
            # We actually want to look at the manifest on the "testing" (or default) branch
            self.repo = github.get_repo(f"Yunohost-Apps/{app_id}_ynh")
            # Determine base branch, either `testing` or default branch
            try:
                self.base_branch = self.repo.get_branch("testing").name
            except:
                self.base_branch = self.repo.default_branch

            contents = self.repo.get_contents("manifest.toml", ref=self.base_branch)
            self.manifest_raw = contents.decoded_content.decode()
            self.manifest_raw_sha = contents.sha
            manifest = toml.loads(self.manifest_raw)

        self.app_id = manifest["id"]
        self.current_version = manifest["version"].split("~")[0]
        self.sources = manifest.get("resources", {}).get("sources")

        if not self.sources:
            raise Exception("There's no resources.sources in manifest.toml ?")

        self.main_upstream = manifest.get("upstream", {}).get("code")

    def run(self):

        todos = {}

        for source, infos in self.sources.items():

            if "autoupdate" not in infos:
                continue

            strategy = infos.get("autoupdate", {}).get("strategy")
            if strategy not in STRATEGIES:
                raise Exception(
                    f"Unknown strategy to autoupdate {source}, expected one of {STRATEGIES}, got {strategy}"
                )

            asset = infos.get("autoupdate", {}).get("asset", "tarball")

            print(f"\n  Checking {source} ...")

            new_version, new_asset_urls = self.get_latest_version_and_asset(
                strategy, asset, infos, source
            )

            if source == "main":
                print(f"Current version in manifest: {self.current_version}")
                print(f"Newest  version on upstream: {new_version}")

            if isinstance(new_asset_urls, str) and infos["url"] == new_asset_urls:
                print(f"URL for asset {source} is up to date")
                continue
            elif isinstance(new_asset_urls, dict) and new_asset_urls == {
                k: infos[k]["url"] for k in new_asset_urls.keys()
            }:
                print(f"URLs for asset {source} are up to date")
                continue
            else:
                print(f"Update needed for {source}")
                todos[source] = {
                    "new_asset_urls": new_asset_urls,
                    "old_assets": infos,
                }

            if source == "main":
                todos[source]["new_version"] = new_version

        if dry_run or not todos:
            return bool(todos)

        if "main" in todos:
            new_version = todos["main"]["new_version"]
            message = f"Upgrade to v{new_version}"
            new_branch = f"ci-auto-update-{new_version}"
        else:
            message = "Upgrade sources"
            new_branch = "ci-auto-update-sources"

        try:
            # Get the commit base for the new branch, and create it
            commit_sha = self.repo.get_branch(self.base_branch).commit.sha
            self.repo.create_git_ref(ref=f"refs/heads/{new_branch}", sha=commit_sha)
        except:
            pass

        manifest_new = self.manifest_raw
        for source, infos in todos.items():
            manifest_new = self.replace_version_and_asset_in_manifest(
                manifest_new,
                infos.get("new_version"),
                infos["new_asset_urls"],
                infos["old_assets"],
                is_main=source == "main",
            )

        self.repo.update_file(
            "manifest.toml",
            message=message,
            content=manifest_new,
            sha=self.manifest_raw_sha,
            branch=new_branch,
            author=author,
        )

        # Wait a bit to preserve the API rate limit
        time.sleep(1.5)

        # Open the PR
        pr = self.repo.create_pull(
            title=message, body=message, head=new_branch, base=self.base_branch
        )

        print("Created PR " + self.repo.full_name + " updated with PR #" + str(pr.id))

        return bool(todos)

    def get_latest_version_and_asset(self, strategy, asset, infos, source):

        upstream = infos.get("autoupdate", {}).get("upstream", self.main_upstream)

        if "github" in strategy:
            assert upstream and upstream.startswith(
                "https://github.com/"
            ), f"When using strategy {strategy}, having a defined upstream code repo on github.com is required"
            upstream_repo = upstream.replace("https://github.com/", "").strip("/")
            assert (
                len(upstream_repo.split("/")) == 2
            ), f"'{upstream}' doesn't seem to be a github repository ?"

        if strategy == "latest_github_release":
            releases = self.github_api(f"repos/{upstream_repo}/releases")
            tags = [
                release["tag_name"]
                for release in releases
                if not release["draft"] and not release["prerelease"]
            ]
            latest_version_orig, latest_version = filter_and_get_latest_tag(
                tags, self.app_id
            )
            if asset == "tarball":
                latest_tarball = (
                    f"{upstream}/archive/refs/tags/{latest_version_orig}.tar.gz"
                )
                return latest_version, latest_tarball
            # FIXME
            else:
                latest_release = [
                    release
                    for release in releases
                    if release["tag_name"] == latest_version_orig
                ][0]
                latest_assets = {
                    a["name"]: a["browser_download_url"]
                    for a in latest_release["assets"]
                    if not a["name"].endswith(".md5")
                }
                if isinstance(asset, str):
                    matching_assets_urls = [
                        url
                        for name, url in latest_assets.items()
                        if re.match(asset, name)
                    ]
                    if not matching_assets_urls:
                        raise Exception(
                            f"No assets matching regex '{asset}' for release {latest_version} among {list(latest_assets.keys())}"
                        )
                    elif len(matching_assets_urls) > 1:
                        raise Exception(
                            f"Too many assets matching regex '{asset}' for release {latest_version} : {matching_assets_urls}"
                        )
                    return latest_version, matching_assets_urls[0]
                elif isinstance(asset, dict):
                    matching_assets_dicts = {}
                    for asset_name, asset_regex in asset.items():
                        matching_assets_urls = [
                            url
                            for name, url in latest_assets.items()
                            if re.match(asset_regex, name)
                        ]
                        if not matching_assets_urls:
                            raise Exception(
                                f"No assets matching regex '{asset_regex}' for release {latest_version} among {list(latest_assets.keys())}"
                            )
                        elif len(matching_assets_urls) > 1:
                            raise Exception(
                                f"Too many assets matching regex '{asset}' for release {latest_version} : {matching_assets_urls}"
                            )
                        matching_assets_dicts[asset_name] = matching_assets_urls[0]
                    return latest_version.strip("v"), matching_assets_dicts

        elif strategy == "latest_github_tag":
            if asset != "tarball":
                raise Exception(
                    "For the latest_github_tag strategy, only asset = 'tarball' is supported"
                )
            tags = self.github_api(f"repos/{upstream_repo}/tags")
            latest_version_orig, latest_version = filter_and_get_latest_tag(
                [t["name"] for t in tags], self.app_id
            )
            latest_tarball = f"{upstream}/archive/refs/tags/{latest_version}.tar.gz"
            return latest_version, latest_tarball

        elif strategy == "latest_github_commit":
            if asset != "tarball":
                raise Exception(
                    "For the latest_github_release strategy, only asset = 'tarball' is supported"
                )
            commits = self.github_api(f"repos/{upstream_repo}/commits")
            latest_commit = commits[0]
            latest_tarball = f"https://github.com/{upstream_repo}/archive/{latest_commit['sha']}.tar.gz"
            # Let's have the version as something like "2023.01.23"
            latest_commit_date = datetime.strptime(latest_commit["commit"]["author"]["date"][:10], "%Y-%M-%d")
            version_format = infos.get("autoupdate", {}).get("force_version", "%Y.%M.%d")
            latest_version = latest_commit_date.strftime(version_format)

            return latest_version, latest_tarball

    def github_api(self, uri):

        r = requests.get(f"https://api.github.com/{uri}", auth=auth)
        assert r.status_code == 200, r
        return r.json()

    def replace_version_and_asset_in_manifest(
        self, content, new_version, new_assets_urls, current_assets, is_main
    ):

        if isinstance(new_assets_urls, str):
            sha256 = sha256_of_remote_file(new_assets_urls)
        elif isinstance(new_assets_urls, dict):
            sha256 = {
                url: sha256_of_remote_file(url) for url in new_assets_urls.values()
            }

        if is_main:

            def repl(m):
                return m.group(1) + new_version + m.group(3)

            content = re.sub(
                r"(\s*version\s*=\s*[\"\'])([\d\.]+)(\~ynh\d+[\"\'])", repl, content
            )
        if isinstance(new_assets_urls, str):
            content = content.replace(current_assets["url"], new_assets_urls)
            content = content.replace(current_assets["sha256"], sha256)
        elif isinstance(new_assets_urls, dict):
            for key, url in new_assets_urls.items():
                content = content.replace(current_assets[key]["url"], url)
                content = content.replace(current_assets[key]["sha256"], sha256[url])

        return content


# Progress bar helper, stolen from https://stackoverflow.com/a/34482761
def progressbar(it, prefix="", size=60, file=sys.stdout):
    it = list(it)
    count = len(it)

    def show(j, name=""):
        name += "          "
        x = int(size * j / count)
        file.write(
            "\n%s[%s%s] %i/%i %s\n" % (prefix, "#" * x, "." * (size - x), j, count, name)
        )
        file.flush()

    show(0)
    for i, item in enumerate(it):
        show(i + 1, item)
        yield item
    file.write("\n")
    file.flush()


if __name__ == "__main__":
    args = [arg for arg in sys.argv[1:] if arg != "--commit-and-create-PR"]

    if len(args):
        AppAutoUpdater(args[0], app_id_is_local_app_dir=True).run()
    else:
        apps_failed = []
        apps_updated = []
        for app in progressbar(apps_to_run_auto_update_for(), "Checking: ", 40):
            try:
                updated = AppAutoUpdater(app).run()
            except Exception as e:
                apps_failed.append(app)
                import traceback
                print(traceback.print_exc())
            else:
                if updated:
                    apps_updated.append(app)

        if apps_failed:
            print(f"Apps failed: {', '.join(apps_failed)}")
            if os.path.exists("/usr/bin/sendxmpppy"):
                 os.system(f"/usr/bin/sendxmpppy 'Failed to run the source auto-update for : {', '.join(apps_failed)}. Please run manually the autoupdate_app_sources.py script on these apps to debug what is happening!'")
        if apps_updated:
            print(f"Apps updated: {', '.join(apps_updated)}")