// Copyright 2014 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 (
	"bytes"
	"fmt"
	"net/url"
)

// MarkdownOptions specifies optional parameters to the Markdown method.
type MarkdownOptions struct {
	// Mode identifies the rendering mode.  Possible values are:
	//   markdown - render a document as plain Markdown, just like
	//   README files are rendered.
	//
	//   gfm - to render a document as user-content, e.g. like user
	//   comments or issues are rendered. In GFM mode, hard line breaks are
	//   always taken into account, and issue and user mentions are linked
	//   accordingly.
	//
	// Default is "markdown".
	Mode string

	// Context identifies the repository context.  Only taken into account
	// when rendering as "gfm".
	Context string
}

type markdownRequest struct {
	Text    *string `json:"text,omitempty"`
	Mode    *string `json:"mode,omitempty"`
	Context *string `json:"context,omitempty"`
}

// Markdown renders an arbitrary Markdown document.
//
// GitHub API docs: https://developer.github.com/v3/markdown/
func (c *Client) Markdown(text string, opt *MarkdownOptions) (string, *Response, error) {
	request := &markdownRequest{Text: String(text)}
	if opt != nil {
		if opt.Mode != "" {
			request.Mode = String(opt.Mode)
		}
		if opt.Context != "" {
			request.Context = String(opt.Context)
		}
	}

	req, err := c.NewRequest("POST", "markdown", request)
	if err != nil {
		return "", nil, err
	}

	buf := new(bytes.Buffer)
	resp, err := c.Do(req, buf)
	if err != nil {
		return "", resp, err
	}

	return buf.String(), resp, nil
}

// ListEmojis returns the emojis available to use on GitHub.
//
// GitHub API docs: https://developer.github.com/v3/emojis/
func (c *Client) ListEmojis() (map[string]string, *Response, error) {
	req, err := c.NewRequest("GET", "emojis", nil)
	if err != nil {
		return nil, nil, err
	}

	var emoji map[string]string
	resp, err := c.Do(req, &emoji)
	if err != nil {
		return nil, resp, err
	}

	return emoji, resp, nil
}

// APIMeta represents metadata about the GitHub API.
type APIMeta struct {
	// An Array of IP addresses in CIDR format specifying the addresses
	// that incoming service hooks will originate from on GitHub.com.
	Hooks []string `json:"hooks,omitempty"`

	// An Array of IP addresses in CIDR format specifying the Git servers
	// for GitHub.com.
	Git []string `json:"git,omitempty"`

	// Whether authentication with username and password is supported.
	// (GitHub Enterprise instances using CAS or OAuth for authentication
	// will return false. Features like Basic Authentication with a
	// username and password, sudo mode, and two-factor authentication are
	// not supported on these servers.)
	VerifiablePasswordAuthentication *bool `json:"verifiable_password_authentication,omitempty"`
}

// APIMeta returns information about GitHub.com, the service. Or, if you access
// this endpoint on your organization’s GitHub Enterprise installation, this
// endpoint provides information about that installation.
//
// GitHub API docs: https://developer.github.com/v3/meta/
func (c *Client) APIMeta() (*APIMeta, *Response, error) {
	req, err := c.NewRequest("GET", "meta", nil)
	if err != nil {
		return nil, nil, err
	}

	meta := new(APIMeta)
	resp, err := c.Do(req, meta)
	if err != nil {
		return nil, resp, err
	}

	return meta, resp, nil
}

// Octocat returns an ASCII art octocat with the specified message in a speech
// bubble.  If message is empty, a random zen phrase is used.
func (c *Client) Octocat(message string) (string, *Response, error) {
	u := "octocat"
	if message != "" {
		u = fmt.Sprintf("%s?s=%s", u, url.QueryEscape(message))
	}

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

	buf := new(bytes.Buffer)
	resp, err := c.Do(req, buf)
	if err != nil {
		return "", resp, err
	}

	return buf.String(), resp, nil
}

// Zen returns a random line from The Zen of GitHub.
//
// see also: http://warpspire.com/posts/taste/
func (c *Client) Zen() (string, *Response, error) {
	req, err := c.NewRequest("GET", "zen", nil)
	if err != nil {
		return "", nil, err
	}

	buf := new(bytes.Buffer)
	resp, err := c.Do(req, buf)
	if err != nil {
		return "", resp, err
	}

	return buf.String(), resp, nil
}