40 lines
1.1 KiB
Go
40 lines
1.1 KiB
Go
package treepath
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import (
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"database/sql"
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"git.gobha.me/xcaliber/chat-switchboard/database"
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)
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// UpdateCursor upserts the channel_cursors row for a user.
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func UpdateCursor(channelID, userID, messageID string) error {
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_, err := database.DB.Exec(`
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INSERT INTO channel_cursors (channel_id, user_id, active_leaf_id)
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VALUES ($1, $2, $3)
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ON CONFLICT (channel_id, user_id) DO UPDATE SET
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active_leaf_id = $3, updated_at = NOW()
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`, channelID, userID, messageID)
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return err
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}
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// NextSiblingIndex returns the next sibling_index for a new child of parentID.
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// For root messages (parentID is nil), counts existing roots in the channel.
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func NextSiblingIndex(channelID string, parentID *string) int {
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var maxIdx sql.NullInt64
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if parentID == nil {
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database.DB.QueryRow(`
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SELECT MAX(sibling_index) FROM messages
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WHERE channel_id = $1 AND parent_id IS NULL AND deleted_at IS NULL
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`, channelID).Scan(&maxIdx)
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} else {
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database.DB.QueryRow(`
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SELECT MAX(sibling_index) FROM messages
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WHERE parent_id = $1 AND deleted_at IS NULL
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`, *parentID).Scan(&maxIdx)
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}
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if !maxIdx.Valid {
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return 0
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}
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return int(maxIdx.Int64) + 1
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}
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