// Copyright 2013 The go-github AUTHORS. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package github

import (
	"fmt"
	"net/url"
	"strconv"
	"time"
)

// WebHookPayload represents the data that is received from GitHub when a push
// event hook is triggered.  The format of these payloads pre-date most of the
// GitHub v3 API, so there are lots of minor incompatibilities with the types
// defined in the rest of the API.  Therefore, several types are duplicated
// here to account for these differences.
//
// GitHub API docs: https://help.github.com/articles/post-receive-hooks
type WebHookPayload struct {
	After      string          `json:"after,omitempty"`
	Before     string          `json:"before,omitempty"`
	Commits    []WebHookCommit `json:"commits,omitempty"`
	Compare    string          `json:"compare,omitempty"`
	Created    bool            `json:"created,omitempty"`
	Deleted    bool            `json:"deleted,omitempty"`
	Forced     bool            `json:"forced,omitempty"`
	HeadCommit *WebHookCommit  `json:"head_commit,omitempty"`
	Pusher     *User           `json:"pusher,omitempty"`
	Ref        string          `json:"ref,omitempty"`
	Repo       *Repository     `json:"repository,omitempty"`
}

// WebHookCommit represents the commit variant we receive from GitHub in a
// WebHookPayload.
type WebHookCommit struct {
	Added     []string      `json:"added,omitempty"`
	Author    WebHookAuthor `json:"author,omitempty"`
	Committer WebHookAuthor `json:"committer,omitempty"`
	Distinct  bool          `json:"distinct,omitempty"`
	ID        string        `json:"id,omitempty"`
	Message   string        `json:"message,omitempty"`
	Modified  []string      `json:"modified,omitempty"`
	Removed   []string      `json:"removed,omitempty"`
	Timestamp *time.Time    `json:"timestamp,omitempty"`
}

// WebHookAuthor represents the author or committer of a commit, as specified
// in a WebHookCommit.  The commit author may not correspond to a GitHub User.
type WebHookAuthor struct {
	Email    string `json:"email,omitempty"`
	Name     string `json:"name,omitempty"`
	Username string `json:"username,omitempty"`
}

// Hook represents a GitHub (web and service) hook for a repository.
type Hook struct {
	CreatedAt *time.Time             `json:"created_at,omitempty"`
	UpdatedAt *time.Time             `json:"updated_at,omitempty"`
	Name      string                 `json:"name,omitempty"`
	Events    []string               `json:"events,omitempty"`
	Active    bool                   `json:"active,omitempty"`
	Config    map[string]interface{} `json:"config,omitempty"`
	ID        int                    `json:"id,omitempty"`
}

// CreateHook creates a Hook for the specified repository.
// Name and Config are required fields.
//
// GitHub API docs: http://developer.github.com/v3/repos/hooks/#create-a-hook
func (s *RepositoriesService) CreateHook(owner, repo string, hook *Hook) (*Hook, *Response, error) {
	u := fmt.Sprintf("repos/%v/%v/hooks", owner, repo)
	req, err := s.client.NewRequest("POST", u, hook)
	if err != nil {
		return nil, nil, err
	}
	h := new(Hook)
	resp, err := s.client.Do(req, h)
	return h, resp, err
}

// ListHooks lists all Hooks for the specified repository.
//
// GitHub API docs: http://developer.github.com/v3/repos/hooks/#list
func (s *RepositoriesService) ListHooks(owner, repo string, opt *ListOptions) ([]Hook, *Response, error) {
	u := fmt.Sprintf("repos/%v/%v/hooks", owner, repo)

	if opt != nil {
		params := url.Values{
			"page": []string{strconv.Itoa(opt.Page)},
		}
		u += "?" + params.Encode()
	}

	req, err := s.client.NewRequest("GET", u, nil)
	if err != nil {
		return nil, nil, err
	}

	hooks := new([]Hook)
	resp, err := s.client.Do(req, hooks)
	return *hooks, resp, err
}

// GetHook returns a single specified Hook.
//
// GitHub API docs: http://developer.github.com/v3/repos/hooks/#get-single-hook
func (s *RepositoriesService) GetHook(owner, repo string, id int) (*Hook, *Response, error) {
	u := fmt.Sprintf("repos/%v/%v/hooks/%d", owner, repo, id)
	req, err := s.client.NewRequest("GET", u, nil)
	if err != nil {
		return nil, nil, err
	}
	hook := new(Hook)
	resp, err := s.client.Do(req, hook)
	return hook, resp, err
}

// EditHook updates a specified Hook.
//
// GitHub API docs: http://developer.github.com/v3/repos/hooks/#edit-a-hook
func (s *RepositoriesService) EditHook(owner, repo string, id int, hook *Hook) (*Hook, *Response, error) {
	u := fmt.Sprintf("repos/%v/%v/hooks/%d", owner, repo, id)
	req, err := s.client.NewRequest("PATCH", u, hook)
	if err != nil {
		return nil, nil, err
	}
	h := new(Hook)
	resp, err := s.client.Do(req, h)
	return h, resp, err
}

// DeleteHook deletes a specified Hook.
//
// GitHub API docs: http://developer.github.com/v3/repos/hooks/#delete-a-hook
func (s *RepositoriesService) DeleteHook(owner, repo string, id int) (*Response, error) {
	u := fmt.Sprintf("repos/%v/%v/hooks/%d", owner, repo, id)
	req, err := s.client.NewRequest("DELETE", u, nil)
	if err != nil {
		return nil, err
	}
	return s.client.Do(req, nil)
}

// TestHook triggers a test Hook by github.
//
// GitHub API docs: http://developer.github.com/v3/repos/hooks/#test-a-push-hook
func (s *RepositoriesService) TestHook(owner, repo string, id int) (*Response, error) {
	u := fmt.Sprintf("repos/%v/%v/hooks/%d/tests", owner, repo, id)
	req, err := s.client.NewRequest("POST", u, nil)
	if err != nil {
		return nil, err
	}
	return s.client.Do(req, nil)
}