package babble

import (
	"fmt"
	"strings"
	"time"

	"dk/internal/database"

	"zombiezen.com/go/sqlite"
)

// Babble represents a global chat message in the database
type Babble struct {
	ID     int    `json:"id"`
	Posted int64  `json:"posted"`
	Author string `json:"author"`
	Babble string `json:"babble"`

	db *database.DB
}

// Find retrieves a babble message by ID
func Find(db *database.DB, id int) (*Babble, error) {
	babble := &Babble{db: db}

	query := "SELECT id, posted, author, babble FROM babble WHERE id = ?"
	err := db.Query(query, func(stmt *sqlite.Stmt) error {
		babble.ID = stmt.ColumnInt(0)
		babble.Posted = stmt.ColumnInt64(1)
		babble.Author = stmt.ColumnText(2)
		babble.Babble = stmt.ColumnText(3)
		return nil
	}, id)

	if err != nil {
		return nil, fmt.Errorf("failed to find babble: %w", err)
	}

	if babble.ID == 0 {
		return nil, fmt.Errorf("babble with ID %d not found", id)
	}

	return babble, nil
}

// All retrieves all babble messages ordered by posted time (newest first)
func All(db *database.DB) ([]*Babble, error) {
	var babbles []*Babble

	query := "SELECT id, posted, author, babble FROM babble ORDER BY posted DESC, id DESC"
	err := db.Query(query, func(stmt *sqlite.Stmt) error {
		babble := &Babble{
			ID:     stmt.ColumnInt(0),
			Posted: stmt.ColumnInt64(1),
			Author: stmt.ColumnText(2),
			Babble: stmt.ColumnText(3),
			db:     db,
		}
		babbles = append(babbles, babble)
		return nil
	})

	if err != nil {
		return nil, fmt.Errorf("failed to retrieve all babble: %w", err)
	}

	return babbles, nil
}

// ByAuthor retrieves babble messages by a specific author
func ByAuthor(db *database.DB, author string) ([]*Babble, error) {
	var babbles []*Babble

	query := "SELECT id, posted, author, babble FROM babble WHERE LOWER(author) = LOWER(?) ORDER BY posted DESC, id DESC"
	err := db.Query(query, func(stmt *sqlite.Stmt) error {
		babble := &Babble{
			ID:     stmt.ColumnInt(0),
			Posted: stmt.ColumnInt64(1),
			Author: stmt.ColumnText(2),
			Babble: stmt.ColumnText(3),
			db:     db,
		}
		babbles = append(babbles, babble)
		return nil
	}, author)

	if err != nil {
		return nil, fmt.Errorf("failed to retrieve babble by author: %w", err)
	}

	return babbles, nil
}

// Recent retrieves the most recent babble messages (limited by count)
func Recent(db *database.DB, limit int) ([]*Babble, error) {
	var babbles []*Babble

	query := "SELECT id, posted, author, babble FROM babble ORDER BY posted DESC, id DESC LIMIT ?"
	err := db.Query(query, func(stmt *sqlite.Stmt) error {
		babble := &Babble{
			ID:     stmt.ColumnInt(0),
			Posted: stmt.ColumnInt64(1),
			Author: stmt.ColumnText(2),
			Babble: stmt.ColumnText(3),
			db:     db,
		}
		babbles = append(babbles, babble)
		return nil
	}, limit)

	if err != nil {
		return nil, fmt.Errorf("failed to retrieve recent babble: %w", err)
	}

	return babbles, nil
}

// Since retrieves babble messages since a specific timestamp
func Since(db *database.DB, since int64) ([]*Babble, error) {
	var babbles []*Babble

	query := "SELECT id, posted, author, babble FROM babble WHERE posted >= ? ORDER BY posted DESC, id DESC"
	err := db.Query(query, func(stmt *sqlite.Stmt) error {
		babble := &Babble{
			ID:     stmt.ColumnInt(0),
			Posted: stmt.ColumnInt64(1),
			Author: stmt.ColumnText(2),
			Babble: stmt.ColumnText(3),
			db:     db,
		}
		babbles = append(babbles, babble)
		return nil
	}, since)

	if err != nil {
		return nil, fmt.Errorf("failed to retrieve babble since timestamp: %w", err)
	}

	return babbles, nil
}

// Between retrieves babble messages between two timestamps (inclusive)
func Between(db *database.DB, start, end int64) ([]*Babble, error) {
	var babbles []*Babble

	query := "SELECT id, posted, author, babble FROM babble WHERE posted >= ? AND posted <= ? ORDER BY posted DESC, id DESC"
	err := db.Query(query, func(stmt *sqlite.Stmt) error {
		babble := &Babble{
			ID:     stmt.ColumnInt(0),
			Posted: stmt.ColumnInt64(1),
			Author: stmt.ColumnText(2),
			Babble: stmt.ColumnText(3),
			db:     db,
		}
		babbles = append(babbles, babble)
		return nil
	}, start, end)

	if err != nil {
		return nil, fmt.Errorf("failed to retrieve babble between timestamps: %w", err)
	}

	return babbles, nil
}

// Search retrieves babble messages containing the search term (case-insensitive)
func Search(db *database.DB, term string) ([]*Babble, error) {
	var babbles []*Babble

	query := "SELECT id, posted, author, babble FROM babble WHERE LOWER(babble) LIKE LOWER(?) ORDER BY posted DESC, id DESC"
	searchTerm := "%" + term + "%"
	
	err := db.Query(query, func(stmt *sqlite.Stmt) error {
		babble := &Babble{
			ID:     stmt.ColumnInt(0),
			Posted: stmt.ColumnInt64(1),
			Author: stmt.ColumnText(2),
			Babble: stmt.ColumnText(3),
			db:     db,
		}
		babbles = append(babbles, babble)
		return nil
	}, searchTerm)

	if err != nil {
		return nil, fmt.Errorf("failed to search babble: %w", err)
	}

	return babbles, nil
}

// RecentByAuthor retrieves recent messages from a specific author
func RecentByAuthor(db *database.DB, author string, limit int) ([]*Babble, error) {
	var babbles []*Babble

	query := "SELECT id, posted, author, babble FROM babble WHERE LOWER(author) = LOWER(?) ORDER BY posted DESC, id DESC LIMIT ?"
	err := db.Query(query, func(stmt *sqlite.Stmt) error {
		babble := &Babble{
			ID:     stmt.ColumnInt(0),
			Posted: stmt.ColumnInt64(1),
			Author: stmt.ColumnText(2),
			Babble: stmt.ColumnText(3),
			db:     db,
		}
		babbles = append(babbles, babble)
		return nil
	}, author, limit)

	if err != nil {
		return nil, fmt.Errorf("failed to retrieve recent babble by author: %w", err)
	}

	return babbles, nil
}

// Save updates an existing babble message in the database
func (b *Babble) Save() error {
	if b.ID == 0 {
		return fmt.Errorf("cannot save babble without ID")
	}

	query := `UPDATE babble SET posted = ?, author = ?, babble = ? WHERE id = ?`
	return b.db.Exec(query, b.Posted, b.Author, b.Babble, b.ID)
}

// Delete removes the babble message from the database
func (b *Babble) Delete() error {
	if b.ID == 0 {
		return fmt.Errorf("cannot delete babble without ID")
	}

	query := "DELETE FROM babble WHERE id = ?"
	return b.db.Exec(query, b.ID)
}

// PostedTime returns the posted timestamp as a time.Time
func (b *Babble) PostedTime() time.Time {
	return time.Unix(b.Posted, 0)
}

// SetPostedTime sets the posted timestamp from a time.Time
func (b *Babble) SetPostedTime(t time.Time) {
	b.Posted = t.Unix()
}

// IsRecent returns true if the babble message was posted within the last hour
func (b *Babble) IsRecent() bool {
	return time.Since(b.PostedTime()) < time.Hour
}

// Age returns how long ago the babble message was posted
func (b *Babble) Age() time.Duration {
	return time.Since(b.PostedTime())
}

// IsAuthor returns true if the given username is the author of this babble message
func (b *Babble) IsAuthor(username string) bool {
	return strings.EqualFold(b.Author, username)
}

// Preview returns a truncated version of the babble for previews
func (b *Babble) Preview(maxLength int) string {
	if len(b.Babble) <= maxLength {
		return b.Babble
	}
	
	if maxLength < 3 {
		return b.Babble[:maxLength]
	}
	
	return b.Babble[:maxLength-3] + "..."
}

// WordCount returns the number of words in the babble message
func (b *Babble) WordCount() int {
	if b.Babble == "" {
		return 0
	}
	
	// Simple word count by splitting on whitespace
	words := 0
	inWord := false
	
	for _, char := range b.Babble {
		if char == ' ' || char == '\t' || char == '\n' || char == '\r' {
			if inWord {
				words++
				inWord = false
			}
		} else {
			inWord = true
		}
	}
	
	if inWord {
		words++
	}
	
	return words
}

// Length returns the character length of the babble message
func (b *Babble) Length() int {
	return len(b.Babble)
}

// Contains returns true if the babble message contains the given term (case-insensitive)
func (b *Babble) Contains(term string) bool {
	return strings.Contains(strings.ToLower(b.Babble), strings.ToLower(term))
}

// IsEmpty returns true if the babble message is empty or whitespace-only
func (b *Babble) IsEmpty() bool {
	return strings.TrimSpace(b.Babble) == ""
}

// IsLongMessage returns true if the message exceeds the typical chat length
func (b *Babble) IsLongMessage(threshold int) bool {
	return b.Length() > threshold
}

// GetMentions returns a slice of usernames mentioned in the message (starting with @)
func (b *Babble) GetMentions() []string {
	words := strings.Fields(b.Babble)
	var mentions []string
	
	for _, word := range words {
		if strings.HasPrefix(word, "@") && len(word) > 1 {
			// Clean up punctuation from the end
			mention := strings.TrimRight(word[1:], ".,!?;:")
			if mention != "" {
				mentions = append(mentions, mention)
			}
		}
	}
	
	return mentions
}

// HasMention returns true if the message mentions the given username
func (b *Babble) HasMention(username string) bool {
	mentions := b.GetMentions()
	for _, mention := range mentions {
		if strings.EqualFold(mention, username) {
			return true
		}
	}
	return false
}