package lib

import (
	"database/sql"
	"fmt"
)

type Story struct {
	ID     int
	RoomID int
	Title  string
	Points *int
	Voted  bool
}

type Vote struct {
	ID      int
	StoryID int
	UserID  int
	Value   string
}

// create story
func CreateStory(roomID int, title string) (*Story, error) {
	_, err := DB.Exec("INSERT INTO stories (room_id, title, voted) VALUES (?, ?, 0)", roomID, title)
	if err != nil {
		return nil, err
	}
	s := &Story{RoomID: roomID, Title: title}
	row := DB.QueryRow("SELECT id, room_id, title, points, voted FROM stories WHERE room_id = ? ORDER BY id DESC LIMIT 1", roomID)
	err = row.Scan(&s.ID, &s.RoomID, &s.Title, &s.Points, &s.Voted)
	return s, err
}

// get stories for room
func GetStoriesForRoom(roomID int) ([]Story, error) {
	rows, err := DB.Query("SELECT id, room_id, title, points, voted FROM stories WHERE room_id = ? ORDER BY id", roomID)
	if err != nil {
		return nil, err
	}
	defer rows.Close()
	var stories []Story
	for rows.Next() {
		var s Story
		var points sql.NullInt64
		var voted int
		err := rows.Scan(&s.ID, &s.RoomID, &s.Title, &points, &voted)
		if err != nil {
			return nil, err
		}
		if points.Valid {
			p := int(points.Int64)
			s.Points = &p
		}
		s.Voted = voted == 1
		stories = append(stories, s)
	}
	return stories, nil
}

// vote on story
func VoteOnStory(storyID, userID int, value string) error {
	_, err := DB.Exec("INSERT OR REPLACE INTO votes (story_id, user_id, value) VALUES (?, ?, ?)", storyID, userID, value)
	return err
}

// get votes for story
func GetVotesForStory(storyID int) ([]Vote, error) {
	rows, err := DB.Query("SELECT story_id, user_id, value FROM votes WHERE story_id = ?", storyID)
	if err != nil {
		return nil, err
	}
	defer rows.Close()
	var votes []Vote
	for rows.Next() {
		var v Vote
		err := rows.Scan(&v.StoryID, &v.UserID, &v.Value)
		if err != nil {
			return nil, err
		}
		votes = append(votes, v)
	}
	return votes, nil
}

// reveal votes — just marks the story as revealed
func RevealVotes(storyID int) error {
	_, err := DB.Exec("UPDATE stories SET voted = 1 WHERE id = ?", storyID)
	return err
}

type VoteView struct {
	Username string
	Value    string
}

// get votes with usernames for display
func GetVotesWithUsernames(storyID int) ([]VoteView, error) {
	rows, err := DB.Query(`
		SELECT u.username, v.value
		FROM votes v
		JOIN users u ON v.user_id = u.id
		WHERE v.story_id = ?
	`, storyID)
	if err != nil {
		return nil, err
	}
	defer rows.Close()
	var views []VoteView
	for rows.Next() {
		var vv VoteView
		err := rows.Scan(&vv.Username, &vv.Value)
		if err != nil {
			return nil, err
		}
		views = append(views, vv)
	}
	return views, nil
}

// unreveal story — set voted back to 0 and clear points
func UnrevealStory(storyID int) error {
	_, err := DB.Exec("UPDATE stories SET voted = 0, points = NULL WHERE id = ?", storyID)
	return err
}

// clear all votes for a story
func ClearVotesForStory(storyID int) error {
	_, err := DB.Exec("DELETE FROM votes WHERE story_id = ?", storyID)
	return err
}

// rename story
func RenameStory(storyID int, title string) error {
	_, err := DB.Exec("UPDATE stories SET title = ? WHERE id = ?", title, storyID)
	return err
}

// delete story and its votes
func DeleteStory(storyID int) error {
	_, err := DB.Exec("DELETE FROM votes WHERE story_id = ?", storyID)
	if err != nil {
		return err
	}
	_, err = DB.Exec("DELETE FROM stories WHERE id = ?", storyID)
	return err
}

func tshirtToPoints(s string) float64 {
	switch s {
	case "XS":
		return 1
	case "S":
		return 3
	case "M":
		return 5
	case "L":
		return 8
	case "XL":
		return 13
	case "XXL":
		return 21
	case "?":
		return 0
	default:
		var n int
		fmt.Sscanf(s, "%d", &n)
		return float64(n)
	}
}

func GetStoryByID(id int) (*Story, error) {
	row := DB.QueryRow("SELECT id, room_id, title, points, voted FROM stories WHERE id = ?", id)
	var s Story
	var points sql.NullInt64
	var voted int
	err := row.Scan(&s.ID, &s.RoomID, &s.Title, &points, &voted)
	if err != nil {
		return nil, err
	}
	if points.Valid {
		p := int(points.Int64)
		s.Points = &p
	}
	s.Voted = voted == 1
	return &s, nil
}