package main

import (
	"bufio"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"mime"
	"net/http"
	"strconv"
	"strings"
)

var mimeOverride map[string]string

// a jpeg file can have a jpe extension and i personally don't like it
// https://github.com/LonamiWebs/Telethon/blob/2e1be01ad4f6462de2e9e1f96a33537e51f44980/telethon/utils.py#L33
func LoadMimetypes() {
	mimeOverride = make(map[string]string)
	mimeOverride["image/png"] = ".png"
	mimeOverride["image/jpeg"] = ".jpeg"
	mimeOverride["image/webp"] = ".webp"
	mimeOverride["image/gif"] = ".gif"
	mimeOverride["image/bmp"] = ".bmp"
	mimeOverride["image/x-tga"] = ".tga"
	mimeOverride["image/tiff"] = ".tiff"
	mimeOverride["image/vnd.adobe.photoshop"] = ".psd"

	mimeOverride["video/mp4"] = ".mp4"
	mimeOverride["video/quicktime"] = ".mov"
	mimeOverride["video/avi"] = ".avi"

	mimeOverride["audio/mpeg"] = ".mp3"
	mimeOverride["audio/m4a"] = ".m4a"
	mimeOverride["audio/aac"] = ".aac"
	mimeOverride["audio/ogg"] = ".ogg"
	mimeOverride["audio/flac"] = ".flac"
}

func GetSubmission(client *http.Client, submissionJsonUrl string) (*Submission, error) {
	request, err := http.NewRequest("GET", submissionJsonUrl, nil)
	if err != nil {
		return nil, fmt.Errorf("Failed to create request: %s", err)
	}
	request.Header.Add("User-Agent", USER_AGENT)
	response, err := client.Do(request)
	if err != nil {
		return nil, fmt.Errorf("Failed to get response: %s", err)
	}
	contents, err := io.ReadAll(response.Body)
	response.Body.Close()
	if err != nil {
		return nil, fmt.Errorf("Failed to read response body: %s", err)
	}
	if response.StatusCode != 200 {
		return nil, fmt.Errorf("Response returned status code %d, body: %s", response.StatusCode, contents)
	}
	var submission []SubmissionResponseItem
	err = json.Unmarshal(contents, &submission)
	if err != nil {
		return nil, fmt.Errorf("Failed to parse response: %s", err)
	}
	return submission[0].Data.Children[0].Data, nil
}

func InteractivelyAskIndex(stdin *bufio.Reader, items []string) (int, error) {
	if len(items) == 1 {
		return 0, nil
	}
	fmt.Printf("Select an item (from 1 to %d): ", len(items))
	str, err := stdin.ReadString('\n')
	if err != nil {
		return 0, fmt.Errorf("Failed to read stdin: %s", err)
	}
	i, err := strconv.Atoi(strings.TrimSpace(str))
	if err != nil {
		return 0, fmt.Errorf("Failed to parse stdin: %s", err)
	}
	i--
	if i < 0 {
		return i, errors.New("Index is under or equal to 0")
	}
	if i >= len(items) {
		return i, errors.New("Index is bigger than items available")
	}
	return i, nil
}

func SplitExt(str string) (string, string) {
	if str == "" {
		return "", ""
	}
	s := strings.Split(str[1:], ".")
	if len(s) < 2 {
		return str, ""
	}
	return str[:1] + strings.Join(s[:len(s)-1], "."), "." + s[len(s)-1]
}

func GetImgurAlbum(client *http.Client, albumId string) ([]ImgurImage, error) {
	response, err := client.Get("https://imgur.com/ajaxalbums/getimages/" + albumId + "/hit.json?all=true")
	if err != nil {
		return nil, fmt.Errorf("Failed to get response: %s", err)
	}
	contents, err := io.ReadAll(response.Body)
	response.Body.Close()
	if err != nil {
		return nil, fmt.Errorf("Failed to read response body: %s", err)
	}
	if response.StatusCode != 200 {
		return nil, fmt.Errorf("Response returned status code %d, body: %s", response.StatusCode, contents)
	}
	var imgurResponse *ImgurResponse
	err = json.Unmarshal(contents, &imgurResponse)
	if err != nil {
		return nil, fmt.Errorf("Failed to parse response: %s", err)
	}
	return imgurResponse.Data.Images, nil
}

func GetGfycat(client *http.Client, gfyId string) (string, error) {
	response, err := client.Get("https://api.gfycat.com/v1/gfycats/" + gfyId)
	if err != nil {
		return "", fmt.Errorf("Failed to get response: %s", err)
	}
	contents, err := io.ReadAll(response.Body)
	response.Body.Close()
	if err != nil {
		return "", fmt.Errorf("Failed to read response body: %s", err)
	}
	if response.StatusCode != 200 {
		return "", fmt.Errorf("Response returned status code %d, body: %s", response.StatusCode, contents)
	}
	var gfycatResponse *GfycatResponse
	err = json.Unmarshal(contents, &gfycatResponse)
	if err != nil {
		return "", fmt.Errorf("Failed to parse response: %s", err)
	}
	return gfycatResponse.GfyItem.Mp4Url, nil
}

func FormatBytes(size float64) string {
	label := ""
	if size >= 1024 {
		size /= 1024
		label = "K"
	}
	if size >= 1024 {
		size /= 1024
		label = "M"
	}
	if size >= 1024 {
		size /= 1024
		label = "G"
	}
	if size >= 1024 {
		size /= 1024
		label = "T"
	}
	return fmt.Sprintf("%.2f %sB", size, label)
}

func GetExtension(mimeType string) (string, error) {
	if mimeType == "" {
		return "", nil
	}
	mediaType, _, err := mime.ParseMediaType(mimeType)
	if err != nil {
		return "", fmt.Errorf("Failed to parse media type of %s: %s", mimeType, err)
	}
	ext, exists := mimeOverride[mediaType]
	if exists {
		return ext, nil
	}
	exts, err := mime.ExtensionsByType(mediaType)
	if err != nil {
		return "", fmt.Errorf("Failed to find file extensions of %s: %s", mediaType, err)
	}
	if len(exts) < 1 {
		return "", nil
	}
	fmt.Println(exts)
	return exts[0], nil
}

func PrintStatus(bytesDownloaded, contentLength float64, lastOutputLength int) int {
	output := fmt.Sprintf("%s downloaded", FormatBytes(bytesDownloaded))
	if contentLength >= 0 {
		contentLengthString := FormatBytes(contentLength)
		output = fmt.Sprintf("%s out of %s downloaded (%.2f%%)", FormatBytes(bytesDownloaded), contentLengthString, bytesDownloaded/contentLength*100.0)
	}
	fmt.Print(output)
	for i := 0; i < lastOutputLength-len(output); i++ {
		fmt.Print(" ")
	}
	fmt.Print("\r")
	return len(output)
}