"""Abstracted methods to simplify role writeup."""

import codecs
from collections import defaultdict

import yaml
from yamllint import linter
from yamllint.config import YamlLintConfig

from ansiblelater.command.candidates import Error
from ansiblelater.exceptions import LaterAnsibleError, LaterError

from .yamlhelper import (action_tasks, normalize_task, normalized_yaml,
                         parse_yaml_linenumbers)


def get_tasks(candidate, settings):
    errors = []
    try:
        with codecs.open(candidate.path, mode="rb", encoding="utf-8") as f:
            yamllines = parse_yaml_linenumbers(f, candidate.path)

    except LaterError as ex:
        e = ex.original
        errors.append(Error(e.problem_mark.line + 1, "syntax error: %s" % (e.problem)))
    except LaterAnsibleError as e:
        errors.append(Error(e.line, "syntax error: %s" % (e.message)))

    return yamllines, errors


def get_action_tasks(candidate, settings):
    tasks = []
    errors = []
    try:
        with codecs.open(candidate.path, mode="rb", encoding="utf-8") as f:
            yamllines = parse_yaml_linenumbers(f, candidate.path)

        if yamllines:
            tasks = action_tasks(yamllines, candidate)
    except LaterError as ex:
        e = ex.original
        errors.append(Error(e.problem_mark.line + 1, "syntax error: %s" % (e.problem)))
    except LaterAnsibleError as e:
        errors.append(Error(e.line, "syntax error: %s" % (e.message)))

    return tasks, errors


def get_normalized_task(task, candidate, settings):
    normalized = None
    errors = []
    try:
        normalized = normalize_task(task, candidate.path, settings["ansible"]["custom_modules"])
    except LaterError as ex:
        e = ex.original
        errors.append(Error(e.problem_mark.line + 1, "syntax error: %s" % (e.problem)))
    except LaterAnsibleError as e:
        errors.append(Error(e.line, "syntax error: %s" % (e.message)))

    return normalized, errors


def get_normalized_tasks(candidate, settings):
    normalized = []
    errors = []
    try:
        with codecs.open(candidate.path, mode="rb", encoding="utf-8") as f:
            yamllines = parse_yaml_linenumbers(f, candidate.path)

        if yamllines:
            tasks = action_tasks(yamllines, candidate)
            for task in tasks:
                # An empty `tags` block causes `None` to be returned if
                # the `or []` is not present - `task.get("tags", [])`
                # does not suffice.
                if "skip_ansible_lint" in (task.get("tags") or []):
                    # No need to normalize_task if we are skipping it.
                    continue
                normalized.append(
                    normalize_task(task, candidate.path, settings["ansible"]["custom_modules"]))

    except LaterError as ex:
        e = ex.original
        errors.append(Error(e.problem_mark.line + 1, "syntax error: %s" % (e.problem)))
    except LaterAnsibleError as e:
        errors.append(Error(e.line, "syntax error: %s" % (e.message)))

    return normalized, errors


def get_normalized_yaml(candidate, settings, options=None):
    errors = []

    if not options:
        options = defaultdict(dict)
        options.update(remove_empty=True)
        options.update(remove_markers=True)

    try:
        yamllines = normalized_yaml(candidate.path, options)
    except LaterError as ex:
        e = ex.original
        errors.append(Error(e.problem_mark.line + 1, "syntax error: %s" % (e.problem)))
    except LaterAnsibleError as e:
        errors.append(Error(e.line, "syntax error: %s" % (e.message)))

    return yamllines, errors


def get_raw_yaml(candidate, settings):
    content = None
    errors = []

    try:
        with codecs.open(candidate.path, mode="rb", encoding="utf-8") as f:
            content = yaml.safe_load(f)

    except LaterError as ex:
        e = ex.original
        errors.append(Error(e.problem_mark.line + 1, "syntax error: %s" % (e.problem)))

    return content, errors


def run_yamllint(path, options="extends: default"):
    errors = []
    try:
        with codecs.open(path, mode="rb", encoding="utf-8") as f:
            for problem in linter.run(f, YamlLintConfig(options)):
                errors.append(Error(problem.line, problem.desc))
    except LaterError as ex:
        e = ex.original
        errors.append(Error(e.problem_mark.line + 1, "syntax error: %s" % (e.problem)))

    return errors