"""Building the app and initializing all prerequisites."""

from __future__ import annotations

import json
import os
import random
import subprocess
from pathlib import Path
from typing import Optional, Union

from reflex import constants
from reflex.config import get_config
from reflex.utils import console, path_ops, prerequisites, processes


def update_json_file(file_path: str, update_dict: dict[str, Union[int, str]]):
    """Update the contents of a json file.

    Args:
        file_path: the path to the JSON file.
        update_dict: object to update json.
    """
    fp = Path(file_path)
    # create file if it doesn't exist
    fp.touch(exist_ok=True)
    # create an empty json object if file is empty
    fp.write_text("{}") if fp.stat().st_size == 0 else None

    with open(fp) as f:  # type: ignore
        json_object: dict = json.load(f)
        json_object.update(update_dict)
    with open(fp, "w") as f:
        json.dump(json_object, f, ensure_ascii=False)


def set_reflex_project_hash():
    """Write the hash of the Reflex project to a REFLEX_JSON."""
    project_hash = random.getrandbits(128)
    console.debug(f"Setting project hash to {project_hash}.")
    update_json_file(constants.REFLEX_JSON, {"project_hash": project_hash})


def set_environment_variables():
    """Write the upload url to a REFLEX_JSON."""
    update_json_file(
        constants.ENV_JSON,
        {
            "uploadUrl": constants.Endpoint.UPLOAD.get_url(),
            "eventUrl": constants.Endpoint.EVENT.get_url(),
            "pingUrl": constants.Endpoint.PING.get_url(),
        },
    )


def set_os_env(**kwargs):
    """Set os environment variables.

    Args:
        kwargs: env key word args.
    """
    for key, value in kwargs.items():
        if not value:
            continue
        os.environ[key.upper()] = value


def generate_sitemap_config(deploy_url: str):
    """Generate the sitemap config file.

    Args:
        deploy_url: The URL of the deployed app.
    """
    # Import here to avoid circular imports.
    from reflex.compiler import templates

    config = json.dumps(
        {
            "siteUrl": deploy_url,
            "generateRobotsTxt": True,
        }
    )

    with open(constants.SITEMAP_CONFIG_FILE, "w") as f:
        f.write(templates.SITEMAP_CONFIG(config=config))


def export(
    backend: bool = True,
    frontend: bool = True,
    zip: bool = False,
    deploy_url: Optional[str] = None,
):
    """Export the app for deployment.

    Args:
        backend: Whether to zip up the backend app.
        frontend: Whether to zip up the frontend app.
        zip: Whether to zip the app.
        deploy_url: The URL of the deployed app.
    """
    # Remove the static folder.
    path_ops.rm(constants.WEB_STATIC_DIR)

    # Generate the sitemap file.
    command = "export"
    if deploy_url is not None:
        generate_sitemap_config(deploy_url)
        command = "export-sitemap"

    checkpoints = [
        "Linting and checking ",
        "Compiled successfully",
        "Route (pages)",
        "Collecting page data",
        "automatically rendered as static HTML",
        'Copying "static build" directory',
        'Copying "public" directory',
        "Finalizing page optimization",
        "Export successful",
    ]

    # Start the subprocess with the progress bar.
    process = processes.new_process(
        [prerequisites.get_package_manager(), "run", command],
        cwd=constants.WEB_DIR,
    )
    processes.show_progress("Creating Production Build", process, checkpoints)

    # Zip up the app.
    if zip:
        if os.name == "posix":
            posix_export(backend, frontend)
        if os.name == "nt":
            nt_export(backend, frontend)


def nt_export(backend: bool = True, frontend: bool = True):
    """Export for nt (Windows) systems.

    Args:
        backend: Whether to zip up the backend app.
        frontend: Whether to zip up the frontend app.
    """
    cmd = r""
    if frontend:
        cmd = r'''powershell -Command "Set-Location .web/_static; Compress-Archive -Path .\* -DestinationPath ..\..\frontend.zip -Force"'''
        os.system(cmd)
    if backend:
        cmd = r'''powershell -Command "Get-ChildItem -File | Where-Object { $_.Name -notin @('.web', 'assets', 'frontend.zip', 'backend.zip') } | Compress-Archive -DestinationPath backend.zip -Update"'''
        os.system(cmd)


def posix_export(backend: bool = True, frontend: bool = True):
    """Export for posix (Linux, OSX) systems.

    Args:
        backend: Whether to zip up the backend app.
        frontend: Whether to zip up the frontend app.
    """
    cmd = r""
    if frontend:
        cmd = r"cd .web/_static && zip -r ../../frontend.zip ./*"
        os.system(cmd)
    if backend:
        cmd = r"zip -r backend.zip ./* -x .web/\* ./assets\* ./frontend.zip\* ./backend.zip\*"
        os.system(cmd)


def setup_frontend(
    root: Path,
    disable_telemetry: bool = True,
):
    """Set up the frontend to run the app.

    Args:
        root: The root path of the project.
        disable_telemetry: Whether to disable the Next telemetry.
    """
    # Install frontend packages.
    prerequisites.install_frontend_packages()

    # Copy asset files to public folder.
    path_ops.cp(
        src=str(root / constants.APP_ASSETS_DIR),
        dest=str(root / constants.WEB_ASSETS_DIR),
    )

    # Set the environment variables in client (env.json).
    set_environment_variables()

    # Disable the Next telemetry.
    if disable_telemetry:
        processes.new_process(
            [
                prerequisites.get_package_manager(),
                "run",
                "next",
                "telemetry",
                "disable",
            ],
            cwd=constants.WEB_DIR,
            stdout=subprocess.DEVNULL,
        )


def setup_frontend_prod(
    root: Path,
    disable_telemetry: bool = True,
):
    """Set up the frontend for prod mode.

    Args:
        root: The root path of the project.
        disable_telemetry: Whether to disable the Next telemetry.
    """
    setup_frontend(root, disable_telemetry)
    export(deploy_url=get_config().deploy_url)