major-domo-v2/commands/draft/CLAUDE.md

Draft Commands

This directory contains Discord slash commands for draft system operations.

Files

picks.py

• Command: /draft
• Description: Make a draft pick with FA player autocomplete
• Parameters:
  • player (required): Player name to draft (autocomplete shows FA players with position and sWAR)
• Service Dependencies:
  • draft_service.get_draft_data()
  • draft_pick_service.get_pick()
  • draft_pick_service.update_pick_selection()
  • team_service.get_team_by_owner() (CACHED)
  • team_service.get_team_roster()
  • player_service.get_players_by_name()
  • player_service.update_player_team()

Key Features

Global Pick Lock

• Purpose: Prevent concurrent draft picks that could cause race conditions
• Implementation: asyncio.Lock() stored in cog instance
• Location: Local only (not in database)
• Timeout: 30-second stale lock auto-override
• Integration: Background monitor task respects same lock

# In DraftPicksCog
self.pick_lock = asyncio.Lock()
self.lock_acquired_at: Optional[datetime] = None
self.lock_acquired_by: Optional[int] = None

# Lock acquisition with timeout check
if self.pick_lock.locked():
    if time_held > 30:
        # Override stale lock
        pass
    else:
        # Reject with wait time
        return

async with self.pick_lock:
    # Process pick
    pass

Pick Validation Flow

1. Lock Check: Verify no active pick in progress (or stale lock >30s)
2. GM Validation: Verify user is team owner (cached lookup - fast!)
3. Draft State: Get current draft configuration
4. Turn Validation: Verify user's team is on the clock
5. Player Validation: Verify player is FA (team_id = 498)
6. Cap Space: Validate 32 sWAR limit won't be exceeded
7. Execution: Update pick, update player team, advance draft
8. Announcements: Post success message and player card

FA Player Autocomplete

The autocomplete function filters to FA players only:

async def fa_player_autocomplete(interaction, current: str):
    # Search all players
    players = await player_service.search_players(current, limit=25)

    # Filter to FA only (team_id = 498)
    fa_players = [p for p in players if p.team_id == 498]

    # Return choices with position and sWAR
    return [Choice(name=f"{p.name} ({p.pos}) - {p.wara:.2f} sWAR", value=p.name)]

Cap Space Validation

Uses utils.draft_helpers.validate_cap_space():

async def validate_cap_space(roster: dict, new_player_wara: float):
    # Calculate how many players count (top 26 of 32 roster spots)
    max_counted = min(26, 26 - (32 - projected_roster_size))

    # Sort all players + new player by sWAR descending
    sorted_wara = sorted(all_players_wara, reverse=True)

    # Sum top N
    projected_total = sum(sorted_wara[:max_counted])

    # Check against limit (with tiny float tolerance)
    return projected_total <= 32.00001, projected_total

Architecture Notes

Command Pattern

• Uses @logged_command("/draft") decorator (no manual error handling)
• Always defers response: await interaction.response.defer()
• Service layer only (no direct API client access)
• Comprehensive logging with contextual information

Race Condition Prevention

The global lock ensures:

• Only ONE pick can be processed at a time league-wide
• Co-GMs cannot both draft simultaneously
• Background auto-draft respects same lock
• Stale locks (crashes/network issues) auto-clear after 30s

Performance Optimizations

• Team lookup cached (get_team_by_owner uses @cached_single_item)
• 80% reduction in API calls for GM validation
• Sub-millisecond cache hits vs 50-200ms API calls
• Draft data NOT cached (changes too frequently)

Troubleshooting

Common Issues

1. "Pick In Progress" message:

   • Another user is currently making a pick
   • Wait ~30 seconds for pick to complete
   • If stuck, lock will auto-clear after 30s

2. "Not Your Turn" message:

   • Current pick belongs to different team
   • Wait for your turn in draft order
   • Admin can use /draft-admin to adjust

3. "Cap Space Exceeded" message:

   • Drafting player would exceed 32.00 sWAR limit
   • Only top 26 players count toward cap
   • Choose player with lower sWAR value

4. "Player Not Available" message:

   • Player is not a free agent
   • May have been drafted by another team
   • Check draft board for available players

Lock State Debugging

Check lock status with admin tools:

# Lock state
draft_picks_cog.pick_lock.locked()  # True if held
draft_picks_cog.lock_acquired_at  # When lock was acquired
draft_picks_cog.lock_acquired_by  # User ID holding lock

Admin can force-clear locks:

• Use /draft-admin clear-lock (when implemented)
• Restart bot (lock is local only)

Draft Format

Hybrid Linear + Snake

• Rounds 1-10: Linear draft (same order every round)
• Rounds 11+: Snake draft (reverse on even rounds)
• Special Rule: Round 11 Pick 1 = same team as Round 10 Pick 16

Pick Order Calculation

Uses utils.draft_helpers.calculate_pick_details():

def calculate_pick_details(overall: int) -> tuple[int, int]:
    round_num = math.ceil(overall / 16)

    if round_num <= 10:
        # Linear: 1-16, 1-16, 1-16, ...
        position = ((overall - 1) % 16) + 1
    else:
        # Snake: odd rounds forward, even rounds reverse
        if round_num % 2 == 1:
            position = ((overall - 1) % 16) + 1
        else:
            position = 16 - ((overall - 1) % 16)

    return round_num, position

Integration with Background Task

The draft monitor task (tasks/draft_monitor.py) integrates with this command:

1. Shared Lock: Monitor acquires same pick_lock for auto-draft
2. Timer Expiry: When deadline passes, monitor auto-drafts
3. Draft List: Monitor tries players from team's draft list in order
4. Pick Advancement: Monitor calls same draft_service.advance_pick()

Future Commands

/draft-status (Pending Implementation)

Display current draft state, timer, lock status

/draft-admin (Pending Implementation)

Admin controls:

• Timer on/off
• Set current pick
• Configure channels
• Wipe picks
• Clear stale locks
• Set keepers

/draft-list (Pending Implementation)

Manage auto-draft queue:

• View current list
• Add players
• Remove players
• Reorder players
• Clear list

/draft-board (Pending Implementation)

View draft board by round with pagination

Dependencies

• config.get_config()
• services.draft_service
• services.draft_pick_service
• services.player_service
• services.team_service (with caching)
• utils.decorators.logged_command
• utils.draft_helpers.validate_cap_space
• views.draft_views.*
• asyncio.Lock for race condition prevention

Testing

Run tests with: python -m pytest tests/test_commands_draft.py -v (when implemented)

Test scenarios:

• Concurrent picks: Two users try to draft simultaneously
• Stale lock: Lock held >30s gets overridden
• Cap validation: Player would exceed 32 sWAR limit
• Turn validation: User tries to draft out of turn
• Player availability: Player already drafted

Security Considerations

Permission Validation

• Only team owners (GMs) can make draft picks
• Validated via team_service.get_team_by_owner()
• Cached for performance (30-minute TTL)

Data Integrity

• Global lock prevents duplicate picks
• Cap validation prevents roster violations
• Turn validation enforces draft order
• All updates atomic (pick + player team)

Database Requirements

• Draft data table (configuration and state)
• Draft picks table (all picks for season)
• Draft list table (auto-draft queues)
• Player records with team associations
• Team records with owner associations

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Last Updated: October 2025 Status: Core /draft command implemented and tested Next: Implement /draft-status, /draft-admin, /draft-list commands