package database

import (
	"database/sql"
	"encoding/xml"
	"fmt"
	"io/ioutil"
	"os"
	"path/filepath"
)

type TVShow struct {
	XMLName      xml.Name `xml:"tvshow" json:"-"`
	Title        string   `xml:"title"`
	OriginalTile string   `xml:"originaltitle"`
	ShowTitle    string   `xml:"showtitle"`
	Year         int      `xml:"year"`
}

func ScanTvshowRoot(root string, db *sql.DB) error {
	log.Noticef("Scanning directory root %v", root)

	files, err := ioutil.ReadDir(root)
	if err != nil {
		return fmt.Errorf("Could not get files in directory \"%v\": %v", root, err)
	}

	tx, err := db.Begin()
	if err != nil {
		return fmt.Errorf("Could not begin db transaction: %v", err)
	}
	defer tx.Commit()

	stmt, err := tx.Prepare("insert into tvshows(title, original_title, show_title, year) values(?, ?, ?, ?)")
	if err != nil {
		return fmt.Errorf("Could not prepare statement: %v", err)
	}
	defer stmt.Close()

	for _, file := range files {
		if file.IsDir() {
			show_path := filepath.Join(root, file.Name())
			if insert_tvshow_nfo(show_path, stmt) {
				err = scan_tvshow_episodes(show_path, tx)
				if err != nil {
					fmt.Fprintf(os.Stderr, "Could not scan for episodes in %v: %v", show_path, err)
					continue
				}
			}
		}
	}
	return nil
}

func insert_tvshow_nfo(show_dir string, stmt *sql.Stmt) bool {
	tvshow_nfo_path := filepath.Join(show_dir, "tvshow.nfo")

	tvshow_nfo_file, err := os.OpenFile(tvshow_nfo_path, os.O_RDONLY, 0755)
	if err != nil {
		log.Debugf("Could not open tvshow.nfo file in \"%v\"\n", show_dir)
		return false
	}
	defer tvshow_nfo_file.Close()

	// try to parse nfo file
	data, err := ioutil.ReadAll(tvshow_nfo_file)
	if err != nil {
		log.Debugf("Could not read data from tvshow.nfo file: %v\n", err)
		return false
	}
	var tvshow TVShow

	err = xml.Unmarshal(data, &tvshow)
	if err != nil {
		log.Debugf("Could not parse tvshow.nfo file contents: %v\n", err)
		return false
	}

	// TODO: Replace with print formatting logic
	log.Debugf("%v (%v):\n", tvshow.Title, tvshow.Year)
	log.Debugf("    Original Title: %v\n", tvshow.OriginalTile)
	log.Debugf("    Show Title: %v\n", tvshow.ShowTitle)

	_, err = stmt.Exec(tvshow.Title, tvshow.OriginalTile, tvshow.ShowTitle, tvshow.Year)
	if err != nil {
		log.Debugf("Could not insert tvshow \"%v\" into database: %v\n", tvshow.Title, err)
		return false
	}
	return true
}

type Episode struct {
	XMLName          xml.Name `xml:"episodedetails" json:"-"`
	Title            string   `xml:"title"`
	ShowTitle        string   `xml:"showtitle"`
	Season           int      `xml:"season"`
	Episode          int      `xml:"episode"`
	OriginalFilename string   `xml:"original_filename"`
}

func scan_tvshow_episodes(show_dir string, tx *sql.Tx) error {

	log.Infof("Scanning episodes for show %v\n", show_dir)

	files, err := ioutil.ReadDir(show_dir)
	if err != nil {
		return fmt.Errorf("Could not enumerate files in folder: %v", err)
	}

	num_episodes := 0

	stmt, err := tx.Prepare("insert into episodes(title, show_title, number, season, original_filename) values(?, ?, ?, ?, ?)")
	if err != nil {
		return fmt.Errorf("Could not prepare statement: %v", err)
	}
	defer stmt.Close()

	for _, file := range files {
		ext := filepath.Ext(file.Name())
		nfo_path := filepath.Join(show_dir, file.Name())

		if file.Name() == "tvshow.nfo" {
			continue
		} else if ext == ".nfo" {
			log.Debugf("Found nfo file: \"%v\"\n", file.Name())
		} else {
			log.Debugf("Skipping file \"%v\", not an nfo file\n", file.Name())
			continue
		}

		log.Debugf("%v\n", file.Name())

		nfo_file, err := os.OpenFile(nfo_path, os.O_RDONLY, 0755)
		if err != nil {
			log.Debugf("Could not open nfo file \"%v\": %v", nfo_path, err)
			continue
		}
		defer nfo_file.Close()

		// try to parse nfo file
		data, err := ioutil.ReadAll(nfo_file)
		if err != nil {
			log.Debugf("Could not read data from nfo file \"%v\": %v\n", nfo_path, err)
			continue
		}
		var episode Episode

		err = xml.Unmarshal(data, &episode)
		if err != nil {
			log.Debugf("Could not parse contents of nfo file \"%v\": %v\n", nfo_path, err)
			continue
		}

		log.Debugf("    Title: %v\n", episode.Title)
		log.Debugf("    Season %v\n", episode.Season)
		log.Debugf("    Episode %v\n", episode.Episode)
		log.Debugf("    Show: %v\n", episode.ShowTitle)
		log.Debugf("    Original Filename: %v\n", episode.OriginalFilename)

		full_original_filename := filepath.Join(show_dir, episode.OriginalFilename)

		_, err = stmt.Exec(episode.Title, episode.ShowTitle, episode.Episode, episode.Season, full_original_filename)
		if err != nil {
			log.Debugf("Could not insert episode %v of tvshow \"%v\" into database: %v\n", episode.Episode, episode.ShowTitle, err)
			continue
		}

		num_episodes++

	}

	log.Infof("Found %v episodes\n", num_episodes)

	return nil
}