import {  OrchestrationGetTurnDiffResult,  type OrchestrationGetFullThreadDiffInput,  type OrchestrationGetFullThreadDiffResult,  type OrchestrationGetTurnDiffResult as OrchestrationGetTurnDiffResultType,} from "@t3tools/contracts";import { Effect, Layer, Schema } from "effect"; import { ProjectionSnapshotQuery } from "../../orchestration/Services/ProjectionSnapshotQuery.ts";import { CheckpointInvariantError, CheckpointUnavailableError } from "../Errors.ts";import { checkpointRefForThreadTurn, resolveThreadWorkspaceCwd } from "../Utils.ts";import { CheckpointStore } from "../Services/CheckpointStore.ts";import {  CheckpointDiffQuery,  type CheckpointDiffQueryShape,} from "../Services/CheckpointDiffQuery.ts"; const isTurnDiffResult = Schema.is(OrchestrationGetTurnDiffResult); const make = Effect.gen(function* () {  const projectionSnapshotQuery = yield* ProjectionSnapshotQuery;  const checkpointStore = yield* CheckpointStore;   const getTurnDiff: CheckpointDiffQueryShape["getTurnDiff"] = (input) =>    Effect.gen(function* () {      const operation = "CheckpointDiffQuery.getTurnDiff";       if (input.fromTurnCount === input.toTurnCount) {        const emptyDiff: OrchestrationGetTurnDiffResultType = {          threadId: input.threadId,          fromTurnCount: input.fromTurnCount,          toTurnCount: input.toTurnCount,          diff: "",        };        if (!isTurnDiffResult(emptyDiff)) {          return yield* new CheckpointInvariantError({            operation,            detail: "Computed turn diff result does not satisfy contract schema.",          });        }        return emptyDiff;      }       const snapshot = yield* projectionSnapshotQuery.getSnapshot();      const thread = snapshot.threads.find((entry) => entry.id === input.threadId);      if (!thread) {        return yield* new CheckpointInvariantError({          operation,          detail: `Thread '${input.threadId}' not found.`,        });      }       const maxTurnCount = thread.checkpoints.reduce(        (max, checkpoint) => Math.max(max, checkpoint.checkpointTurnCount),        0,      );      if (input.toTurnCount > maxTurnCount) {        return yield* new CheckpointUnavailableError({          threadId: input.threadId,          turnCount: input.toTurnCount,          detail: `Turn diff range exceeds current turn count: requested ${input.toTurnCount}, current ${maxTurnCount}.`,        });      }       const workspaceCwd = resolveThreadWorkspaceCwd({        thread,        projects: snapshot.projects,      });      if (!workspaceCwd) {        return yield* new CheckpointInvariantError({          operation,          detail: `Workspace path missing for thread '${input.threadId}' when computing turn diff.`,        });      }       const fromCheckpointRef =        input.fromTurnCount === 0          ? checkpointRefForThreadTurn(input.threadId, 0)          : thread.checkpoints.find(              (checkpoint) => checkpoint.checkpointTurnCount === input.fromTurnCount,            )?.checkpointRef;      if (!fromCheckpointRef) {        return yield* new CheckpointUnavailableError({          threadId: input.threadId,          turnCount: input.fromTurnCount,          detail: `Checkpoint ref is unavailable for turn ${input.fromTurnCount}.`,        });      }       const toCheckpointRef = thread.checkpoints.find(        (checkpoint) => checkpoint.checkpointTurnCount === input.toTurnCount,      )?.checkpointRef;      if (!toCheckpointRef) {        return yield* new CheckpointUnavailableError({          threadId: input.threadId,          turnCount: input.toTurnCount,          detail: `Checkpoint ref is unavailable for turn ${input.toTurnCount}.`,        });      }       const [fromExists, toExists] = yield* Effect.all(        [          checkpointStore.hasCheckpointRef({            cwd: workspaceCwd,            checkpointRef: fromCheckpointRef,          }),          checkpointStore.hasCheckpointRef({            cwd: workspaceCwd,            checkpointRef: toCheckpointRef,          }),        ],        { concurrency: "unbounded" },      );       if (!fromExists) {        return yield* new CheckpointUnavailableError({          threadId: input.threadId,          turnCount: input.fromTurnCount,          detail: `Filesystem checkpoint is unavailable for turn ${input.fromTurnCount}.`,        });      }       if (!toExists) {        return yield* new CheckpointUnavailableError({          threadId: input.threadId,          turnCount: input.toTurnCount,          detail: `Filesystem checkpoint is unavailable for turn ${input.toTurnCount}.`,        });      }       const diff = yield* checkpointStore.diffCheckpoints({        cwd: workspaceCwd,        fromCheckpointRef,        toCheckpointRef,        fallbackFromToHead: false,      });       const turnDiff: OrchestrationGetTurnDiffResultType = {        threadId: input.threadId,        fromTurnCount: input.fromTurnCount,        toTurnCount: input.toTurnCount,        diff,      };      if (!isTurnDiffResult(turnDiff)) {        return yield* new CheckpointInvariantError({          operation,          detail: "Computed turn diff result does not satisfy contract schema.",        });      }       return turnDiff;    });   const getFullThreadDiff: CheckpointDiffQueryShape["getFullThreadDiff"] = (    input: OrchestrationGetFullThreadDiffInput,  ) =>    getTurnDiff({      threadId: input.threadId,      fromTurnCount: 0,      toTurnCount: input.toTurnCount,    }).pipe(Effect.map((result): OrchestrationGetFullThreadDiffResult => result));   return {    getTurnDiff,    getFullThreadDiff,  } satisfies CheckpointDiffQueryShape;}); export const CheckpointDiffQueryLive = Layer.effect(CheckpointDiffQuery, make);