import filecmp
import json
import os
import sys
import textwrap
from enum import Enum
from hashlib import sha1
from pathlib import Path
from typing import Dict

from plumbum import local
from prompt_toolkit.input.ansi_escape_sequences import REVERSE_ANSI_SEQUENCES
from prompt_toolkit.keys import Keys

import copier
from copier.types import StrOrPath

PROJECT_TEMPLATE = Path(__file__).parent / "demo"

DATA = {
    "py3": True,
    "make_secret": lambda: sha1(os.urandom(48)).hexdigest(),
    "myvar": "awesome",
    "what": "world",
    "project_name": "Copier",
    "version": "2.0.0",
    "description": "A library for rendering projects templates",
}

COPIER_CMD = local.get(
    # Allow debugging in VSCode
    # HACK https://github.com/microsoft/vscode-python/issues/14222
    str(Path(sys.executable).parent / "copier.cmd"),
    str(Path(sys.executable).parent / "copier"),
    # Poetry installs the executable as copier.cmd in Windows
    "copier.cmd",
    "copier",
)
COPIER_PATH = str(COPIER_CMD.executable)

# Helpers to use with tests designed for old copier bracket envops defaults
BRACKET_ENVOPS = {
    "autoescape": False,
    "block_end_string": "%]",
    "block_start_string": "[%",
    "comment_end_string": "#]",
    "comment_start_string": "[#",
    "keep_trailing_newline": True,
    "variable_end_string": "]]",
    "variable_start_string": "[[",
}
BRACKET_ENVOPS_JSON = json.dumps(BRACKET_ENVOPS)
SUFFIX_TMPL = ".tmpl"

# Helper to parse back an iso-formatted datetime; needed for py3.6, where
# datetime.datetime.fromisoformat() doesn't exist
ISOFORMAT = "%Y-%m-%d %H:%M:%S.%f"


class Keyboard(str, Enum):
    ControlH = REVERSE_ANSI_SEQUENCES[Keys.ControlH]
    Enter = "\r"
    Esc = REVERSE_ANSI_SEQUENCES[Keys.Escape]

    Home = REVERSE_ANSI_SEQUENCES[Keys.Home]
    End = REVERSE_ANSI_SEQUENCES[Keys.End]

    Up = REVERSE_ANSI_SEQUENCES[Keys.Up]
    Down = REVERSE_ANSI_SEQUENCES[Keys.Down]
    Right = REVERSE_ANSI_SEQUENCES[Keys.Right]
    Left = REVERSE_ANSI_SEQUENCES[Keys.Left]

    # Equivalent keystrokes in terminals; see python-prompt-toolkit for
    # further explanations
    Alt = Esc
    Backspace = ControlH


def render(tmp_path, **kwargs):
    kwargs.setdefault("quiet", True)
    copier.copy(str(PROJECT_TEMPLATE), tmp_path, data=DATA, **kwargs)


def assert_file(tmp_path, *path):
    p1 = os.path.join(str(tmp_path), *path)
    p2 = os.path.join(str(PROJECT_TEMPLATE), *path)
    assert filecmp.cmp(p1, p2)


def build_file_tree(spec: Dict[StrOrPath, str], dedent: bool = True):
    """Builds a file tree based on the received spec."""
    for path, contents in spec.items():
        path = Path(path)
        if dedent:
            contents = textwrap.dedent(contents)
        path.parent.mkdir(parents=True, exist_ok=True)
        with path.open("w") as fd:
            fd.write(contents)