# Copyright 2014 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import base64
import hashlib

from recipe_engine import recipe_test_api


class GitilesTestApi(recipe_test_api.RecipeTestApi):
  def _make_gitiles_response_json(self, data):
    return self.m.json.output(data)

  def make_refs_test_data(self, *refs):
    return self._make_gitiles_response_json({ref: None for ref in refs})

  def make_log_test_data(self, s, n=3, cursor=None):
    result = {
      "log": [
        self.make_commit_gitiles_dict(
          commit="fake %s hash %d" % (s, i),
          msg="fake %s msg %d" % (s, i),
          new_files=["%s.py" % (chr(i + ord("a")))],
          email="fake_%s@fake_%i.email.com" % (s, i),
        )
        for i in range(n)
      ],
    }
    if cursor:
      result["next"] = cursor
    return self._make_gitiles_response_json(result)

  def make_commit_test_data(self, commit, msg, new_files=None, email=None):
    """Constructs fake Gitiles commit JSON test output.

    This data structure conforms to the JSON response that Gitiles provides when
    a commit is queried. For example:
    https://chromium.googlesource.com/chromium/src/+/875b896a3256c5b86c8725e81489e99ea6c2b4c9?format=json

    Args:
      commit (str): The fake commit hash.
      msg (str): The commit message.
      new_files (list): If not None, a list of filenames (str) to simulate being
          added in this commit.
      email: if not None, a proper email with '@' in it to be used for
          committer's and author's emails.
    Returns: (raw_io.Output) A simulated Gitiles fetch 'json' output.
    """
    commit = self.make_commit_gitiles_dict(commit, msg, new_files, email)
    return self._make_gitiles_response_json(commit)

  def make_commit_gitiles_dict(self, commit, msg, new_files, email=None):
    if email is None:
      name = "Test Author"
      email = "testauthor@fake.chromium.org"
    else:
      assert "@" in email
      name = email.split("@")[0]
    d = {
      "commit": self.make_hash(commit),
      "tree": self.make_hash("tree", commit),
      "parents": [self.make_hash("parent", commit)],
      "author": {
        "name": name,
        "email": email,
        "time": "Mon Jan 01 00:00:00 2015",
      },
      "committer": {
        "name": name,
        "email": email,
        "time": "Mon Jan 01 00:00:00 2015",
      },
      "message": msg,
      "tree_diff": [],
    }
    if new_files:
      d["tree_diff"].extend(
        {
          "type": "add",
          "old_id": 40 * "0",
          "old_mode": 0,
          "new_id": self.make_hash("file", f, commit),
          "new_mode": 33188,
          "new_path": f,
        }
        for f in new_files
      )
    return d

  def make_hash(self, *bases):
    return hashlib.sha1(":".join(bases).encode("utf-8")).hexdigest()

  def make_encoded_file(self, data):
    """Encodes data into base64.

    Args:
      data (str): unicode-encodable string.
    Returns: (str) base64-encoded data string.
    """
    return self.m.json.output(
      {
        "value": base64.b64encode(data.encode("utf-8")).decode("utf-8"),
      }
    )

  def make_encoded_file_from_bytes(self, data):
    """Encodes data into base64.

    Args:
      data (bytes): byte string to encode.
    Returns: (str) base64-encoded data string.
    """
    return self.m.json.output(
      {
        "value": base64.b64encode(data).decode("utf-8"),
      }
    )