package main

import (
	"context"
	"fmt"
	"io"
	"log"
	"net/http"
	"os"
	"strconv"

	"github.com/gin-gonic/gin"
	"github.com/jackc/pgx/v5/pgxpool"
	"github.com/jaswdr/faker"
)

// This is taken from our DB model
type video struct {
	ID       int    `json:"id"`
	Filepath string `json:"filepath"`
}

// videos slice to seed record video data.
var videos []video

func main() {
	dbpool, err := pgxpool.New(context.Background(), "postgresql://postgres:postgres@172.19.0.2:5432/postgres")
	if err != nil {
		log.Fatal(err)
	}
	defer dbpool.Close()

	sqlStmt := `
	DROP TABLE IF EXISTS public.videos;

	CREATE TABLE IF NOT EXISTS public.videos
	(
		id integer NOT NULL,
		filepath text,
		CONSTRAINT videos_pkey PRIMARY KEY (id)
	)

	TABLESPACE pg_default;

	ALTER TABLE IF EXISTS public.videos
		OWNER to postgres;
	`
	_, err = dbpool.Exec(context.Background(), sqlStmt)
	if err != nil {
		log.Fatalf("Unable to connection to database: %v\n", err)
	}

	faker := faker.New()

	for i := 0; i < 10; i++ {
		sqlStmt = fmt.Sprintf("insert into public.videos(id, filepath) values(%d, '%s')", i, faker.File().AbsoluteFilePathForUnix(2))
		_, err = dbpool.Exec(context.Background(), sqlStmt)
		if err != nil {
			log.Fatalf("Unable to add videos: %v\n", err)
		}
	}

	rows, _ := dbpool.Query(context.Background(), "select * from videos")
	for rows.Next() {
		var id int
		var name string
		err = rows.Scan(&id, &name)
		if err != nil {
			log.Fatalf("Unable to list videos: %v\n", err)
		}
		fmt.Println(id, name)
	}
	err = rows.Err()
	if err != nil {
		log.Fatalf("Unable to list videos: %v\n", err)
	}

	// Legacy
	for i := 0; i < 10; i++ {
		videos = append(videos, video{ID: i, Filepath: faker.File().AbsoluteFilePathForUnix(5)})
	}

	router := gin.Default()
	router.SetTrustedProxies(nil)

	router.POST("/upload", ReceiveFile)
	router.GET("/videos", getvideos)
	router.GET("/videos/:id", getvideoByID)
	router.POST("/videos", postvideos)
	router.DELETE("/videos", delvideos)
	router.DELETE("/videos/:id", delvideoByID)
	router.PATCH("/videos/:id", updatevideo)

	router.Run("localhost:8080")
}

func remove(slice []video, s int) []video {
	return append(slice[:s], slice[s+1:]...)
}

func ReceiveFile(c *gin.Context) {
	// maybe even re-verify mime-type (before or after upload)

	fileName := c.GetHeader("file-name")
	/*
		get data from request
			write append data to file
	*/
	data, err := io.ReadAll(c.Request.Body)
	if err != nil {
		c.IndentedJSON(http.StatusBadRequest, "Unknown Error")
		return
	}

	f, err := os.OpenFile(fileName, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
	if err != nil {
		log.Fatal(err)
	}
	if _, err := f.Write(data); err != nil {
		log.Fatal(err)
	}
	if err := f.Close(); err != nil {
		log.Fatal(err)
	}

	c.IndentedJSON(http.StatusOK, "Received chunk")
}

// getvideos responds with the list of all videos as JSON.
func getvideos(c *gin.Context) {
	c.IndentedJSON(http.StatusOK, videos)
}

// postvideos adds an video from JSON received in the request body.
func postvideos(c *gin.Context) {
	var newvideo video

	// Call BindJSON to bind the received JSON to
	// newvideo.
	if err := c.BindJSON(&newvideo); err != nil {
		c.Status(http.StatusBadRequest)
		return
	}

	for _, a := range videos {
		if a == newvideo {
			c.Status(http.StatusBadRequest)
			return
		}
	}

	// Add the new video to the slice.
	videos = append(videos, newvideo)
	c.IndentedJSON(http.StatusCreated, newvideo)
}

// getvideoByID locates the video whose ID value matches the id
// parameter sent by the client, then returns that video as a response.
func getvideoByID(c *gin.Context) {
	inputId := c.Param("id")

	// Loop through the list of videos, looking for
	// an video whose ID value matches the parameter.
	for _, a := range videos {
		if strconv.Itoa(a.ID) == inputId {
			c.IndentedJSON(http.StatusOK, a)
			return
		}
	}
	c.IndentedJSON(http.StatusNotFound, gin.H{"message": "video not found"})
}

func delvideos(c *gin.Context) {
	videos = []video{}
	c.IndentedJSON(http.StatusOK, videos)
}

func delvideoByID(c *gin.Context) {
	inputId := c.Param("id")

	for s, a := range videos {
		if strconv.Itoa(a.ID) == inputId {
			videos = remove(videos, s)
			c.IndentedJSON(http.StatusCreated, videos)
			return
		}
	}
	c.IndentedJSON(http.StatusNotFound, gin.H{"message": "video not found"})
}

func updatevideo(c *gin.Context) {
	inputId := c.Param("id")

	var newvideo video

	if err := c.BindJSON(&newvideo); err != nil {
		return
	}

	for s, a := range videos {
		if strconv.Itoa(a.ID) == inputId {
			videos = remove(videos, s)
			videos = append(videos, newvideo)
			c.IndentedJSON(http.StatusCreated, newvideo)
			return
		}
	}
	c.IndentedJSON(http.StatusNotFound, gin.H{"message": "video not found"})
}