package telegraph

import (
	"encoding/json"
	"fmt"
	"strconv"

	"github.com/valyala/fasthttp"
)

// CreatePage create a new Telegraph page. On success, returns a Page object.
func (account *Account) CreatePage(page *Page, returnContent bool) (*Page, error) {
	var args fasthttp.Args

	// Access token of the Telegraph account.
	args.Add("access_token", account.AccessToken) // required

	// Page title.
	args.Add("title", page.Title) // required

	if page.AuthorName != "" {
		// Author name, displayed below the article's title.
		args.Add("author_name", page.AuthorName)
	}

	if page.AuthorURL != "" {
		// Profile link, opened when users click on the author's name below
		// the title. Can be any link, not necessarily to a Telegram profile
		// or channel.
		args.Add("author_url", page.AuthorURL)
	}

	// If true, a content field will be returned in the Page object.
	args.Add("return_content", strconv.FormatBool(returnContent))

	content, err := json.Marshal(page.Content)
	if err != nil {
		return nil, err
	}

	// Content of the page.
	args.Add("content", string(content)) // required

	url := fmt.Sprintf(APIEndpoint, "createPage")
	body, err := request(url, &args)
	if err != nil {
		return nil, err
	}

	var resp Page
	if err := json.Unmarshal(body.Result, &resp); err != nil {
		return nil, err
	}

	return &resp, nil
}

// EditPage edit an existing Telegraph page. On success, returns a Page
// object.
func (account *Account) EditPage(update *Page, returnContent bool) (*Page, error) {
	var args fasthttp.Args

	// Access token of the Telegraph account.
	args.Add("access_token", account.AccessToken) // required

	// Page title.
	args.Add("title", update.Title) // required

	if update.AuthorName != "" {
		// Author name, displayed below the article's title.
		args.Add("author_name", update.AuthorName)
	}

	if update.AuthorURL != "" {
		// Profile link, opened when users click on the author's name below
		// the title. Can be any link, not necessarily to a Telegram profile
		// or channel.
		args.Add("author_url", update.AuthorURL)
	}

	// If true, a content field will be returned in the Page object.
	args.Add("return_content", strconv.FormatBool(returnContent))

	content, err := json.Marshal(update.Content)
	if err != nil {
		return nil, err
	}

	// Content of the page.
	args.Add("content", string(content)) // required

	url := fmt.Sprintf(PathEndpoint, "editPage", update.Path)
	body, err := request(url, &args)
	if err != nil {
		return nil, err
	}

	var resp Page
	if err := json.Unmarshal(body.Result, &resp); err != nil {
		return nil, err
	}

	return &resp, nil
}

// GetPage get a Telegraph page. Returns a Page object on success.
func GetPage(path string, returnContent bool) (*Page, error) {
	var args fasthttp.Args

	// If true, content field will be returned in Page object.
	args.Add("return_content", strconv.FormatBool(returnContent))

	url := fmt.Sprintf(PathEndpoint, "getPage", path)
	body, err := request(url, &args)
	if err != nil {
		return nil, err
	}

	var resp Page
	if err := json.Unmarshal(body.Result, &resp); err != nil {
		return nil, err
	}

	return &resp, nil
}

// GetPageList get a list of pages belonging to a Telegraph account. Returns
// a PageList object, sorted by most recently created pages first.
func (account *Account) GetPageList(offset int, limit int) (*PageList, error) {
	var args fasthttp.Args

	// Access token of the Telegraph account.
	args.Add("access_token", account.AccessToken) // required

	// Sequential number of the first page to be returned.
	args.Add("offset", strconv.Itoa(offset))

	// Limits the number of pages to be retrieved.
	args.Add("limit", strconv.Itoa(limit))

	url := fmt.Sprintf(APIEndpoint, "getPageList")
	body, err := request(url, &args)
	if err != nil {
		return nil, err
	}

	var resp PageList
	if err := json.Unmarshal(body.Result, &resp); err != nil {
		return nil, err
	}

	return &resp, nil
}

// GetViews get the number of views for a Telegraph article. By default, the
// total number of page views will be returned. Returns a PageViews object
// on success.
func GetViews(path string, hour int, day int, month int, year int) (*PageViews, error) {
	var args fasthttp.Args

	if hour > -1 {
		// If passed, the number of page views for the requested hour will
		// be returned.
		args.Add("hour", strconv.Itoa(hour))
	}

	if day > 0 {
		// Required if hour is passed. If passed, the number of page views
		// for the requested day will be returned.
		args.Add("day", strconv.Itoa(day))
	}

	if month > 0 {
		// Required if day is passed. If passed, the number of page views
		// for the requested month will be returned.
		args.Add("month", strconv.Itoa(month))
	}

	if year > 0 {
		// Required if month is passed. If passed, the number of page views
		// for the requested year will be returned.
		args.Add("year", strconv.Itoa(year))
	}

	url := fmt.Sprintf(PathEndpoint, "getViews", path)
	body, err := request(url, &args)
	if err != nil {
		return nil, err
	}

	var resp PageViews
	if err := json.Unmarshal(body.Result, &resp); err != nil {
		return nil, err
	}

	return &resp, nil
}