// Copyright 2014 The Gogs Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

package gogs

import (
	"bytes"
	"encoding/json"
	"errors"
	"fmt"
	"net/http"
	"strings"
	"time"
)

var (
	ErrInvalidReceiveHook = errors.New("Invalid JSON payload received over webhook")
)

type Hook struct {
	ID      int64             `json:"id"`
	Type    string            `json:"type"`
	URL     string            `json:"-"`
	Config  map[string]string `json:"config"`
	Events  []string          `json:"events"`
	Active  bool              `json:"active"`
	Updated time.Time         `json:"updated_at"`
	Created time.Time         `json:"created_at"`
}

func (c *Client) ListRepoHooks(user, repo string) ([]*Hook, error) {
	hooks := make([]*Hook, 0, 10)
	return hooks, c.getParsedResponse("GET", fmt.Sprintf("/repos/%s/%s/hooks", user, repo), nil, nil, &hooks)
}

type CreateHookOption struct {
	Type   string            `json:"type" binding:"Required"`
	Config map[string]string `json:"config" binding:"Required"`
	Events []string          `json:"events"`
	Active bool              `json:"active"`
}

func (c *Client) CreateRepoHook(user, repo string, opt CreateHookOption) (*Hook, error) {
	body, err := json.Marshal(&opt)
	if err != nil {
		return nil, err
	}
	h := new(Hook)
	return h, c.getParsedResponse("POST", fmt.Sprintf("/repos/%s/%s/hooks", user, repo),
		http.Header{"content-type": []string{"application/json"}}, bytes.NewReader(body), h)
}

type EditHookOption struct {
	Config map[string]string `json:"config"`
	Events []string          `json:"events"`
	Active *bool             `json:"active"`
}

func (c *Client) EditRepoHook(user, repo string, id int64, opt EditHookOption) error {
	body, err := json.Marshal(&opt)
	if err != nil {
		return err
	}
	_, err = c.getResponse("PATCH", fmt.Sprintf("/repos/%s/%s/hooks/%d", user, repo, id),
		http.Header{"content-type": []string{"application/json"}}, bytes.NewReader(body))
	return err
}

type Payloader interface {
	SetSecret(string)
	JSONPayload() ([]byte, error)
}

type PayloadAuthor struct {
	Name     string `json:"name"`
	Email    string `json:"email"`
	UserName string `json:"username"`
}

type PayloadUser struct {
	UserName  string `json:"login"`
	ID        int64  `json:"id"`
	AvatarUrl string `json:"avatar_url"`
}

type PayloadCommit struct {
	ID      string         `json:"id"`
	Message string         `json:"message"`
	URL     string         `json:"url"`
	Author  *PayloadAuthor `json:"author"`
}

type PayloadRepo struct {
	ID            int64          `json:"id"`
	Name          string         `json:"name"`
	URL           string         `json:"url"`
	SSHURL        string         `json:"ssh_url"`
	CloneURL      string         `json:"clone_url"`
	Description   string         `json:"description"`
	Website       string         `json:"website"`
	Watchers      int            `json:"watchers"`
	Owner         *PayloadAuthor `json:"owner"`
	Private       bool           `json:"private"`
	DefaultBranch string         `json:"default_branch"`
}

var (
	_ Payloader = &CreatePayload{}
	_ Payloader = &PushPayload{}
)

// _________                        __
// \_   ___ \_______   ____ _____ _/  |_  ____
// /    \  \/\_  __ \_/ __ \\__  \\   __\/ __ \
// \     \____|  | \/\  ___/ / __ \|  | \  ___/
//  \______  /|__|    \___  >____  /__|  \___  >
//         \/             \/     \/          \/

type CreatePayload struct {
	Secret  string       `json:"secret"`
	Ref     string       `json:"ref"`
	RefType string       `json:"ref_type"`
	Repo    *PayloadRepo `json:"repository"`
	Sender  *PayloadUser `json:"sender"`
}

func (p *CreatePayload) SetSecret(secret string) {
	p.Secret = secret
}

func (p *CreatePayload) JSONPayload() ([]byte, error) {
	data, err := json.MarshalIndent(p, "", "  ")
	if err != nil {
		return []byte{}, err
	}
	return data, nil
}

// ParseCreateHook parses create event hook content.
func ParseCreateHook(raw []byte) (*CreatePayload, error) {
	hook := new(CreatePayload)
	if err := json.Unmarshal(raw, hook); err != nil {
		return nil, err
	}

	// it is possible the JSON was parsed, however,
	// was not from Gogs (maybe was from Bitbucket)
	// So we'll check to be sure certain key fields
	// were populated
	switch {
	case hook.Repo == nil:
		return nil, ErrInvalidReceiveHook
	case len(hook.Ref) == 0:
		return nil, ErrInvalidReceiveHook
	}
	return hook, nil
}

// __________             .__
// \______   \__ __  _____|  |__
//  |     ___/  |  \/  ___/  |  \
//  |    |   |  |  /\___ \|   Y  \
//  |____|   |____//____  >___|  /
//                      \/     \/

// PushPayload represents a payload information of push event.
type PushPayload struct {
	Secret     string           `json:"secret"`
	Ref        string           `json:"ref"`
	Before     string           `json:"before"`
	After      string           `json:"after"`
	CompareUrl string           `json:"compare_url"`
	Commits    []*PayloadCommit `json:"commits"`
	Repo       *PayloadRepo     `json:"repository"`
	Pusher     *PayloadAuthor   `json:"pusher"`
	Sender     *PayloadUser     `json:"sender"`
}

func (p *PushPayload) SetSecret(secret string) {
	p.Secret = secret
}

func (p *PushPayload) JSONPayload() ([]byte, error) {
	data, err := json.MarshalIndent(p, "", "  ")
	if err != nil {
		return []byte{}, err
	}
	return data, nil
}

// ParsePushHook parses push event hook content.
func ParsePushHook(raw []byte) (*PushPayload, error) {
	hook := new(PushPayload)
	if err := json.Unmarshal(raw, hook); err != nil {
		return nil, err
	}

	switch {
	case hook.Repo == nil:
		return nil, ErrInvalidReceiveHook
	case len(hook.Ref) == 0:
		return nil, ErrInvalidReceiveHook
	}
	return hook, nil
}

// Branch returns branch name from a payload
func (p *PushPayload) Branch() string {
	return strings.Replace(p.Ref, "refs/heads/", "", -1)
}