package handlers

import (
	"database/sql"
	"html/template"
	"log"
	"net/http"
	"strings"
	"time"

	"github.com/mmcdole/gofeed"
	"paterissa.net/mblog/internal/models"
)

type written struct {
	Title     string
	Published string
	Link      string
}

type video struct {
	Title       string
	Description string
	Published   string
	Link        string
}

type rssContext struct {
	err *log.Logger
	db  *sql.DB

	Feed    models.Feed
	Written []written
	Videos  []video
	Rows    []models.Feed
	IsAuth  bool
}

func (ctx *rssContext) new(w http.ResponseWriter, r *http.Request) {
	if r.Method != "POST" {
		w.WriteHeader(http.StatusMethodNotAllowed)
		w.Write([]byte("Method Not Allowed"))
		return
	}

	cookie, err := r.Cookie("paterissa_session_token")
	if err != nil {
		w.WriteHeader(http.StatusUnauthorized)
		w.Write([]byte("Unauthorized"))
		return
	}

	err = r.ParseForm()
	if err != nil {
		w.WriteHeader(http.StatusInternalServerError)
		w.Write([]byte("Internal Server Error"))
		return
	}

	name := r.Form.Get("name")
	url := r.Form.Get("url")
	category := r.Form.Get("category")

	stmt, err := ctx.db.Prepare("SELECT * FROM cookies WHERE content = $1;")
	if err != nil {
		w.WriteHeader(http.StatusInternalServerError)
		w.Write([]byte("Internal Error"))
		ctx.err.Printf("Could not load cookies from DB: %v\n", err)
		return
	}
	defer stmt.Close()

	var id uint64
	var content string
	var userId uint64
	var expiration time.Time

	row := stmt.QueryRow(cookie.Value)
	err = row.Scan(&id, &content, &userId, &expiration)
	if err != nil {
		w.WriteHeader(http.StatusInternalServerError)
		w.Write([]byte("Internal Error"))
		return
	}

	insertStmt, err := ctx.db.Prepare("INSERT INTO feeds (name, user_id, url, category) VALUES ($1, $2, $3, $4);")
	if err != nil {
		w.WriteHeader(http.StatusInternalServerError)
		w.Write([]byte("Internal Error"))
		ctx.err.Printf("Could not prepare insert statement to DB: %v\n", err)
		return
	}
	defer insertStmt.Close()

	var categoryInt int
	switch category {
	case "YouTube":
		categoryInt = models.YoutubeFeed
	case "Text":
		fallthrough
	default:
		categoryInt = models.TextFeed
	}

	_, err = insertStmt.Exec(name, userId, url, categoryInt)
	if err != nil {
		w.WriteHeader(http.StatusInternalServerError)
		w.Write([]byte("Internal Error"))
		ctx.err.Printf("Could not execute feed into DB: %v\n", err)
		return
	}

	http.Redirect(w, r, "/feeds", http.StatusFound)
	return
}

func (ctx *rssContext) feed(w http.ResponseWriter, r *http.Request) {
	ctx.Videos = []video{}
	ctx.Feed = models.Feed{}

	id := r.URL.Query().Get("id")

	stmt, err := ctx.db.Prepare("SELECT * FROM feeds WHERE id = $1;")
	if err != nil {
		w.WriteHeader(http.StatusInternalServerError)
		w.Write([]byte("Internal Error"))
		ctx.err.Printf("Could not load feeds from DB: %v\n", err)
		return
	}
	defer stmt.Close()

	var f models.Feed

	row := stmt.QueryRow(id)
	err = row.Scan(&f.Id, &f.Name, &f.User, &f.Url, &f.Category)

	ctx.Feed = f

	parser := gofeed.NewParser()
	feed, err := parser.ParseURL(f.Url)
	if err != nil {
		w.WriteHeader(http.StatusInternalServerError)
		w.Write([]byte("Internal Error"))
		ctx.err.Printf("Could not parse RSS feed: %v\n", err)
		return
	}

	files := []string{
		"ui/html/base.tmpl.html",
		"ui/html/music_player.tmpl.html",
	}

	switch f.Category {
	case models.YoutubeFeed:
		files = append(files, "ui/html/pages/video_feed.tmpl.html")

		for _, raw := range feed.Items {
			var v video

			v.Title = raw.Title
			v.Description = raw.Extensions["media"]["group"][0].Children["description"][0].Value
			v.Published = raw.Published
			v.Link = strings.Replace(raw.Link, "watch?v=", "embed/", 1)

			ctx.Videos = append(ctx.Videos, v)
		}
	case models.TextFeed:
		fallthrough
	default:
		files = append(files, "ui/html/pages/feed.tmpl.html")

		for _, raw := range feed.Items {
			var t written

			t.Title = raw.Title
			t.Published = raw.Published
			t.Link = raw.Link

			ctx.Written = append(ctx.Written, t)
		}
	}

	compiled, err := template.ParseFiles(files...)
	if err != nil {
		w.WriteHeader(http.StatusInternalServerError)
		w.Write([]byte("Internal Error"))
		ctx.err.Printf("Could not parse template: %v\n", err)
		return
	}

	err = compiled.ExecuteTemplate(w, "base", ctx)
	if err != nil {
		w.WriteHeader(http.StatusInternalServerError)
		w.Write([]byte("Internal Error"))
		ctx.err.Printf("Could not execute template: %v\n", err)
		return
	}

	return
}

func (ctx *rssContext) index(w http.ResponseWriter, r *http.Request) {
	ctx.Rows = []models.Feed{}
	ctx.IsAuth = false

	_, err := r.Cookie("paterissa_session_token")
	if err == nil {
		ctx.IsAuth = true
	}

	rows, err := ctx.db.Query("SELECT f.id, f.name, u.name, f.url FROM feeds f INNER JOIN logins u ON f.user_id = u.id ORDER BY f.name ASC;")
	if err != nil {
		w.WriteHeader(http.StatusInternalServerError)
		w.Write([]byte("Internal Error"))
		ctx.err.Printf("Could not load posts from DB: %v\n", err)
		return
	}
	defer rows.Close()

	for rows.Next() {
		var f models.Feed

		if err = rows.Scan(&f.Id, &f.Name, &f.User, &f.Url); err != nil {
			w.WriteHeader(http.StatusInternalServerError)
			w.Write([]byte("Internal Error"))
			ctx.err.Printf("Could not load posts from DB: %v\n", err)
			return
		}

		ctx.Rows = append(ctx.Rows, f)
	}

	files := []string{
		"ui/html/base.tmpl.html",
		"ui/html/music_player.tmpl.html",
		"ui/html/pages/feed_index.tmpl.html",
	}

	compiled, err := template.ParseFiles(files...)
	if err != nil {
		w.WriteHeader(http.StatusInternalServerError)
		w.Write([]byte("Internal Error"))
		ctx.err.Printf("Could not parse template: %v\n", err)
		return
	}

	err = compiled.ExecuteTemplate(w, "base", ctx)
	if err != nil {
		w.WriteHeader(http.StatusInternalServerError)
		w.Write([]byte("Internal Error"))
		ctx.err.Printf("Could not execute template: %v\n", err)
		return
	}
}