from __future__ import annotations

import contextlib
import os
import shutil
import subprocess
import tempfile

import questionary

from commitizen import factory, git, out
from commitizen.config import BaseConfig
from commitizen.cz.exceptions import CzException
from commitizen.cz.utils import get_backup_file_path
from commitizen.exceptions import (
    CommitError,
    CommitMessageLengthExceededError,
    CustomError,
    DryRunExit,
    NoAnswersError,
    NoCommitBackupError,
    NotAGitProjectError,
    NotAllowed,
    NothingToCommitError,
)
from commitizen.git import smart_open


class Commit:
    """Show prompt for the user to create a guided commit."""

    def __init__(self, config: BaseConfig, arguments: dict):
        if not git.is_git_project():
            raise NotAGitProjectError()

        self.config: BaseConfig = config
        self.encoding = config.settings["encoding"]
        self.cz = factory.committer_factory(self.config)
        self.arguments = arguments
        self.temp_file: str = get_backup_file_path()

    def read_backup_message(self) -> str | None:
        # Check the commit backup file exists
        if not os.path.isfile(self.temp_file):
            return None

        # Read commit message from backup
        with open(self.temp_file, encoding=self.encoding) as f:
            return f.read().strip()

    def prompt_commit_questions(self) -> str:
        # Prompt user for the commit message
        cz = self.cz
        questions = cz.questions()
        for question in filter(lambda q: q["type"] == "list", questions):
            question["use_shortcuts"] = self.config.settings["use_shortcuts"]
        try:
            answers = questionary.prompt(questions, style=cz.style)
        except ValueError as err:
            root_err = err.__context__
            if isinstance(root_err, CzException):
                raise CustomError(root_err.__str__())
            raise err

        if not answers:
            raise NoAnswersError()

        message = cz.message(answers)
        message_len = len(message.partition("\n")[0].strip())
        message_length_limit: int = self.arguments.get("message_length_limit", 0)
        if 0 < message_length_limit < message_len:
            raise CommitMessageLengthExceededError(
                f"Length of commit message exceeds limit ({message_len}/{message_length_limit})"
            )

        return message

    def manual_edit(self, message: str) -> str:
        editor = git.get_core_editor()
        if editor is None:
            raise RuntimeError("No 'editor' value given and no default available.")
        exec_path = shutil.which(editor)
        if exec_path is None:
            raise RuntimeError(f"Editor '{editor}' not found.")
        with tempfile.NamedTemporaryFile(mode="w", delete=False) as file:
            file.write(message)
        file_path = file.name
        argv = [exec_path, file_path]
        subprocess.call(argv)
        with open(file_path) as temp_file:
            message = temp_file.read().strip()
        os.unlink(file.name)
        return message

    def __call__(self):
        extra_args: str = self.arguments.get("extra_cli_args", "")

        allow_empty: bool = "--allow-empty" in extra_args

        dry_run: bool = self.arguments.get("dry_run")
        write_message_to_file: bool = self.arguments.get("write_message_to_file")
        manual_edit: bool = self.arguments.get("edit")

        is_all: bool = self.arguments.get("all")
        if is_all:
            c = git.add("-u")

        if git.is_staging_clean() and not (dry_run or allow_empty):
            raise NothingToCommitError("No files added to staging!")

        if write_message_to_file is not None and write_message_to_file.is_dir():
            raise NotAllowed(f"{write_message_to_file} is a directory")

        retry: bool = self.arguments.get("retry")
        no_retry: bool = self.arguments.get("no_retry")
        retry_after_failure: bool = self.config.settings.get("retry_after_failure")

        if retry:
            m = self.read_backup_message()
            if m is None:
                raise NoCommitBackupError()
        elif retry_after_failure and not no_retry:
            m = self.read_backup_message()
            if m is None:
                m = self.prompt_commit_questions()
        else:
            m = self.prompt_commit_questions()

        if manual_edit:
            m = self.manual_edit(m)

        out.info(f"\n{m}\n")

        if write_message_to_file:
            with smart_open(write_message_to_file, "w", encoding=self.encoding) as file:
                file.write(m)

        if dry_run:
            raise DryRunExit()

        always_signoff: bool = self.config.settings["always_signoff"]
        signoff: bool = self.arguments.get("signoff")

        if signoff:
            out.warn(
                "signoff mechanic is deprecated, please use `cz commit -- -s` instead."
            )

        if always_signoff or signoff:
            extra_args = f"{extra_args} -s".strip()

        c = git.commit(m, args=extra_args)

        if c.return_code != 0:
            out.error(c.err)

            # Create commit backup
            with smart_open(self.temp_file, "w", encoding=self.encoding) as f:
                f.write(m)

            raise CommitError()

        if "nothing added" in c.out or "no changes added to commit" in c.out:
            out.error(c.out)
        else:
            with contextlib.suppress(FileNotFoundError):
                os.remove(self.temp_file)
            out.write(c.err)
            out.write(c.out)
            out.success("Commit successful!")
