Lock a law group for 3 days after it changes

[Drefvelin]

Summary

Adds a config option that stops a faction switching away from a law for a set time after switching to it.

• Config: law-switch-lock-days in config.yml, default 3. 0 turns it off. It's read on config load, so live servers get the 3-day default without editing their config.
• What's blocked: other laws in that group show "This law was changed recently. It can change again in 2d 5h." in the law menu. They can't be applied directly by a leader without a council, proposed to the council, or used as a movement cause. The current law is always shown as available.
• Council votes: a passed law proposal re-checks the lock before applying. This covers the case where a coup, war or movement switched the group after the proposal was made.
• Bypass: coups, movement outcomes, war outcomes, civil war and admin setlaw ignore the lock, but they still start it.
• Persistence: the switch time is saved per group in faction JSON as "law changed at": {group: epochMillis}. Older jars ignore the field, so rolling back is safe. Factions with no recorded switch start unlocked.

Testing

• mvn test: all passing, including a new LawSwitchLockTest (9 tests). One civil-war test was updated because that path now uses switchTo.

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features
  • Faction law changes now have a configurable cooldown, set to three days by default. While the cooldown is active, switching to a different law in the same group is blocked; applying the current law remains available.
  • Coups, movements, war outcomes, and admin commands can bypass the cooldown. Set the cooldown to 0 to disable it.
  • Cooldown progress is preserved across restarts.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

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Run ID: 313500ee-d78b-47fa-92d9-09ea7f41c9f0

📥 Commits

Reviewing files that changed from the base of the PR and between 022e7e2 and 7e9e4b1.

📒 Files selected for processing (2)

• src/main/java/net/tfminecraft/simplefactions/laws/CanHaveLaw.java
• src/test/java/net/tfminecraft/simplefactions/laws/LawSwitchLockTest.java

🚧 Files skipped from review as they are similar to previous changes (2)

• src/main/java/net/tfminecraft/simplefactions/laws/CanHaveLaw.java
• src/test/java/net/tfminecraft/simplefactions/laws/LawSwitchLockTest.java

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📝 Walkthrough

Walkthrough

Law groups now track and persist their last switch time. A configurable lock duration controls when another law can be selected. Law availability checks and law proposals use the lock, while configured law-switch paths record switch times.

Changes

Law-switch lock

Layer / File(s)	Summary
Configure and persist switch times src/main/java/net/tfminecraft/simplefactions/Cache.java, src/main/java/net/tfminecraft/simplefactions/loaders/ConfigLoader.java, src/main/resources/config.yml, src/main/java/net/tfminecraft/simplefactions/database/FactionData.java, src/main/java/net/tfminecraft/simplefactions/database/Database.java	Adds the law-switch-lock-days setting, defaulting to three days. Faction data stores law-group change times, and database loading and saving restore and persist positive timestamps.
Track switches and evaluate lock availability src/main/java/net/tfminecraft/simplefactions/laws/LawGroup.java, src/main/java/net/tfminecraft/simplefactions/laws/CanHaveLaw.java, src/test/java/net/tfminecraft/simplefactions/laws/LawSwitchLockTest.java	LawGroup records changed times and calculates remaining lock duration. CanHaveLaw returns a lock reason before checking requirements and compatibility. Tests cover switch timing, availability, and duration formatting.
Apply lock checks and record switches src/main/java/net/tfminecraft/simplefactions/government/proposal/Proposal.java, src/main/java/net/tfminecraft/simplefactions/objects/Faction.java, src/main/java/net/tfminecraft/simplefactions/war/civilwar/CivilWarStartService.java, src/test/java/net/tfminecraft/simplefactions/war/civilwar/CivilWarStartServiceTest.java	Law proposals check for an active lock when cause is null. Faction law changes and configured vassalage changes now use LawGroup.switchTo to record switch times. The civil-war test checks the updated vassalage path.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant Proposal
  participant CanHaveLaw
  participant LawGroup
  Proposal->>CanHaveLaw: Check law lock
  CanHaveLaw->>LawGroup: Get remaining lock time
  LawGroup-->>CanHaveLaw: Return remaining duration
  CanHaveLaw-->>Proposal: Return lock reason or no lock

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Merge Risk: ⚪ Minimal · up to 7e9e4

The three-day lock, its disabled setting, and the intended exceptions appear consistent. No actionable merge risk was identified.

Security Architecture Review

Security architecture risk: 🟡 Moderate · up to 022e7

The new lock is enforced on the normal proposal path, but a rollback followed by a return to the new version could erase active lock periods. The risk is limited to factions whose data is saved while the older version is running.

Retained concerns

• Medium · security · inferred: A rollback that saves faction data with the older schema can discard active law-switch timestamps; returning to the new version then restores those groups as unlocked.

Security review details

Security Blast Radius

• inferred — A lost timestamp affects the lock for the saved faction and law group, rather than granting a server-wide privilege. It requires a rollback, an older-version save, and a subsequent re-upgrade.

Security Findings and Attack Paths

• inferred — After that rollback sequence removes an active timestamp, the availability and council-application checks see no remaining lock. No evidence establishes that an ordinary player can initiate the rollback or edit faction JSON.

Trust Boundaries and Controls

• observed — The normal player selection path checks law availability, and council application checks again after voting. A non-null movement cause is a deliberate exception, not evidence by itself of an unauthorized player bypass.

Resilience and Maintainability Implications

• observed — Law application records the switch before processing faction-scoped effects. The reviewed evidence does not establish how an interrupted or failed effect application is recovered.

Hardening Proposals

• proposed — For deployments that may roll back and re-upgrade, preserve faction JSON snapshots or otherwise retain active timestamps across older-version saves before relying on the lock after re-upgrade.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 20.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 30 functions across 11 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding a three-day lock after a law group changes.

• Fix all pre-merge checks with AI

✨ Finishing Touches 💡 1

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_{A rabbit marks the law-switch day,
Three quiet days must pass away.
The current law may stay in place,
While clocks count down at measured pace.
Then new laws hop into the race.}

_{Comment @coderabbitai help to get the list of available commands.}

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
In `@src/main/java/net/tfminecraft/simplefactions/laws/CanHaveLaw.java`:
- Line 41: Update CanHaveLaw.lockReason to exempt the current law, matching the
existing current-law exception in blockReason, so a proposal for the law already
in effect is not rejected due to the group lock.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 0c67dfe1-7d8a-4d57-b3ab-27c62d8711a0

📥 Commits

Reviewing files that changed from the base of the PR and between d51ce88 and 022e7e2.

📒 Files selected for processing (12)

• src/main/java/net/tfminecraft/simplefactions/Cache.java
• src/main/java/net/tfminecraft/simplefactions/database/Database.java
• src/main/java/net/tfminecraft/simplefactions/database/FactionData.java
• src/main/java/net/tfminecraft/simplefactions/government/proposal/Proposal.java
• src/main/java/net/tfminecraft/simplefactions/laws/CanHaveLaw.java
• src/main/java/net/tfminecraft/simplefactions/laws/LawGroup.java
• src/main/java/net/tfminecraft/simplefactions/loaders/ConfigLoader.java
• src/main/java/net/tfminecraft/simplefactions/objects/Faction.java
• src/main/java/net/tfminecraft/simplefactions/war/civilwar/CivilWarStartService.java
• src/main/resources/config.yml
• src/test/java/net/tfminecraft/simplefactions/laws/LawSwitchLockTest.java
• src/test/java/net/tfminecraft/simplefactions/war/civilwar/CivilWarStartServiceTest.java

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