// @ts-nocheck
import { randomUUID } from "node:crypto";
import { and, desc, eq, isNotNull, ne } from "drizzle-orm";
import { Loop } from "rivetkit/workflow";
import type { AgentType, HandoffRecord, HandoffSummary, ProviderId, RepoOverview, RepoStackAction, RepoStackActionResult } from "@openhandoff/shared";
import { getActorRuntimeContext } from "../context.js";
import { getHandoff, getOrCreateHandoff, getOrCreateHistory, getOrCreateProjectBranchSync, getOrCreateProjectPrSync, selfProject } from "../handles.js";
import { isActorNotFoundError, logActorWarning, resolveErrorMessage } from "../logging.js";
import { openhandoffRepoClonePath } from "../../services/openhandoff-paths.js";
import { expectQueueResponse } from "../../services/queue.js";
import { withRepoGitLock } from "../../services/repo-git-lock.js";
import { branches, handoffIndex, prCache, repoMeta } from "./db/schema.js";
import { deriveFallbackTitle } from "../../services/create-flow.js";
import { normalizeBaseBranchName } from "../../integrations/git-spice/index.js";
import { sortBranchesForOverview } from "./stack-model.js";

interface EnsureProjectCommand {
  remoteUrl: string;
}

interface EnsureProjectResult {
  localPath: string;
}

interface CreateHandoffCommand {
  task: string;
  providerId: ProviderId;
  agentType: AgentType | null;
  explicitTitle: string | null;
  explicitBranchName: string | null;
  onBranch: string | null;
}

interface HydrateHandoffIndexCommand {}

interface ListReservedBranchesCommand {}

interface RegisterHandoffBranchCommand {
  handoffId: string;
  branchName: string;
  requireExistingRemote?: boolean;
}

interface ListHandoffSummariesCommand {
  includeArchived?: boolean;
}

interface GetHandoffEnrichedCommand {
  handoffId: string;
}

interface GetPullRequestForBranchCommand {
  branchName: string;
}

interface PrSyncResult {
  items: Array<{
    number: number;
    headRefName: string;
    state: string;
    title: string;
    url?: string;
    author?: string;
    isDraft?: boolean;
    ciStatus?: string | null;
    reviewStatus?: string | null;
    reviewer?: string | null;
  }>;
  at: number;
}

interface BranchSyncResult {
  items: Array<{
    branchName: string;
    commitSha: string;
    parentBranch?: string | null;
    trackedInStack?: boolean;
    diffStat?: string | null;
    hasUnpushed?: boolean;
    conflictsWithMain?: boolean;
  }>;
  at: number;
}

interface RepoOverviewCommand {}

interface RunRepoStackActionCommand {
  action: RepoStackAction;
  branchName?: string;
  parentBranch?: string;
}

const PROJECT_QUEUE_NAMES = [
  "project.command.ensure",
  "project.command.hydrateHandoffIndex",
  "project.command.createHandoff",
  "project.command.registerHandoffBranch",
  "project.command.runRepoStackAction",
  "project.command.applyPrSyncResult",
  "project.command.applyBranchSyncResult",
] as const;

type ProjectQueueName = (typeof PROJECT_QUEUE_NAMES)[number];

export { PROJECT_QUEUE_NAMES };

export function projectWorkflowQueueName(name: ProjectQueueName): ProjectQueueName {
  return name;
}

async function ensureLocalClone(c: any, remoteUrl: string): Promise<string> {
  const { config, driver } = getActorRuntimeContext();
  const localPath = openhandoffRepoClonePath(config, c.state.workspaceId, c.state.repoId);
  await driver.git.ensureCloned(remoteUrl, localPath);
  c.state.localPath = localPath;
  return localPath;
}

async function ensureProjectSyncActors(c: any, localPath: string): Promise<void> {
  if (c.state.syncActorsStarted) {
    return;
  }

  const prSync = await getOrCreateProjectPrSync(c, c.state.workspaceId, c.state.repoId, localPath, 30_000);
  await prSync.start();

  const branchSync = await getOrCreateProjectBranchSync(c, c.state.workspaceId, c.state.repoId, localPath, 5_000);
  await branchSync.start();

  c.state.syncActorsStarted = true;
}

async function deleteStaleHandoffIndexRow(c: any, handoffId: string): Promise<void> {
  try {
    await c.db.delete(handoffIndex).where(eq(handoffIndex.handoffId, handoffId)).run();
  } catch {
    // Best-effort cleanup only; preserve the original caller flow.
  }
}

function isStaleHandoffReferenceError(error: unknown): boolean {
  const message = resolveErrorMessage(error);
  return isActorNotFoundError(error) || message.startsWith("Handoff not found:");
}

async function ensureHandoffIndexHydrated(c: any): Promise<void> {
  if (c.state.handoffIndexHydrated) {
    return;
  }

  const existing = await c.db.select({ handoffId: handoffIndex.handoffId }).from(handoffIndex).limit(1).get();

  if (existing) {
    c.state.handoffIndexHydrated = true;
    return;
  }

  // Migration path for old project actors that only tracked handoffs in history.
  try {
    const history = await getOrCreateHistory(c, c.state.workspaceId, c.state.repoId);
    const rows = await history.list({ limit: 5_000 });
    const seen = new Set<string>();
    let skippedMissingHandoffActors = 0;

    for (const row of rows) {
      if (!row.handoffId || seen.has(row.handoffId)) {
        continue;
      }
      seen.add(row.handoffId);

      try {
        const h = getHandoff(c, c.state.workspaceId, c.state.repoId, row.handoffId);
        await h.get();
      } catch (error) {
        if (isStaleHandoffReferenceError(error)) {
          skippedMissingHandoffActors += 1;
          continue;
        }
        throw error;
      }

      await c.db
        .insert(handoffIndex)
        .values({
          handoffId: row.handoffId,
          branchName: row.branchName,
          createdAt: row.createdAt,
          updatedAt: row.createdAt,
        })
        .onConflictDoNothing()
        .run();
    }

    if (skippedMissingHandoffActors > 0) {
      logActorWarning("project", "skipped missing handoffs while hydrating index", {
        workspaceId: c.state.workspaceId,
        repoId: c.state.repoId,
        skippedMissingHandoffActors,
      });
    }
  } catch (error) {
    logActorWarning("project", "handoff index hydration from history failed", {
      workspaceId: c.state.workspaceId,
      repoId: c.state.repoId,
      error: resolveErrorMessage(error),
    });
  }

  c.state.handoffIndexHydrated = true;
}

async function ensureProjectReady(c: any): Promise<string> {
  if (!c.state.remoteUrl) {
    throw new Error("project remoteUrl is not initialized");
  }
  if (!c.state.localPath) {
    await ensureLocalClone(c, c.state.remoteUrl);
  }
  if (!c.state.localPath) {
    throw new Error("project local repo is not initialized");
  }
  await ensureProjectSyncActors(c, c.state.localPath);
  return c.state.localPath;
}

async function ensureProjectReadyForRead(c: any): Promise<string> {
  if (!c.state.remoteUrl) {
    throw new Error("project remoteUrl is not initialized");
  }

  if (!c.state.localPath || !c.state.syncActorsStarted) {
    const result = await projectActions.ensure(c, { remoteUrl: c.state.remoteUrl });
    const localPath = result?.localPath ?? c.state.localPath;
    if (!localPath) {
      throw new Error("project local repo is not initialized");
    }
    return localPath;
  }

  return c.state.localPath;
}

async function ensureHandoffIndexHydratedForRead(c: any): Promise<void> {
  if (c.state.handoffIndexHydrated) {
    return;
  }
  await projectActions.hydrateHandoffIndex(c, {});
}

async function forceProjectSync(c: any, localPath: string): Promise<void> {
  const prSync = await getOrCreateProjectPrSync(c, c.state.workspaceId, c.state.repoId, localPath, 30_000);
  await prSync.force();

  const branchSync = await getOrCreateProjectBranchSync(c, c.state.workspaceId, c.state.repoId, localPath, 5_000);
  await branchSync.force();
}

async function enrichHandoffRecord(c: any, record: HandoffRecord): Promise<HandoffRecord> {
  const branchName = record.branchName;
  const br =
    branchName != null
      ? await c.db
          .select({
            diffStat: branches.diffStat,
            hasUnpushed: branches.hasUnpushed,
            conflictsWithMain: branches.conflictsWithMain,
            parentBranch: branches.parentBranch,
          })
          .from(branches)
          .where(eq(branches.branchName, branchName))
          .get()
      : null;

  const pr =
    branchName != null
      ? await c.db
          .select({
            prUrl: prCache.prUrl,
            prAuthor: prCache.prAuthor,
            ciStatus: prCache.ciStatus,
            reviewStatus: prCache.reviewStatus,
            reviewer: prCache.reviewer,
          })
          .from(prCache)
          .where(eq(prCache.branchName, branchName))
          .get()
      : null;

  return {
    ...record,
    diffStat: br?.diffStat ?? null,
    hasUnpushed: br?.hasUnpushed != null ? String(br.hasUnpushed) : null,
    conflictsWithMain: br?.conflictsWithMain != null ? String(br.conflictsWithMain) : null,
    parentBranch: br?.parentBranch ?? null,
    prUrl: pr?.prUrl ?? null,
    prAuthor: pr?.prAuthor ?? null,
    ciStatus: pr?.ciStatus ?? null,
    reviewStatus: pr?.reviewStatus ?? null,
    reviewer: pr?.reviewer ?? null,
  };
}

async function ensureProjectMutation(c: any, cmd: EnsureProjectCommand): Promise<EnsureProjectResult> {
  c.state.remoteUrl = cmd.remoteUrl;
  const localPath = await ensureLocalClone(c, cmd.remoteUrl);

  await c.db
    .insert(repoMeta)
    .values({
      id: 1,
      remoteUrl: cmd.remoteUrl,
      updatedAt: Date.now(),
    })
    .onConflictDoUpdate({
      target: repoMeta.id,
      set: {
        remoteUrl: cmd.remoteUrl,
        updatedAt: Date.now(),
      },
    })
    .run();

  await ensureProjectSyncActors(c, localPath);
  return { localPath };
}

async function hydrateHandoffIndexMutation(c: any, _cmd?: HydrateHandoffIndexCommand): Promise<void> {
  await ensureHandoffIndexHydrated(c);
}

async function createHandoffMutation(c: any, cmd: CreateHandoffCommand): Promise<HandoffRecord> {
  const localPath = await ensureProjectReady(c);
  const onBranch = cmd.onBranch?.trim() || null;
  const initialBranchName = onBranch;
  const initialTitle = onBranch ? deriveFallbackTitle(cmd.task, cmd.explicitTitle ?? undefined) : null;
  const handoffId = randomUUID();

  if (onBranch) {
    await forceProjectSync(c, localPath);

    const branchRow = await c.db.select({ branchName: branches.branchName }).from(branches).where(eq(branches.branchName, onBranch)).get();
    if (!branchRow) {
      throw new Error(`Branch not found in repo snapshot: ${onBranch}`);
    }

    await registerHandoffBranchMutation(c, {
      handoffId,
      branchName: onBranch,
      requireExistingRemote: true,
    });
  }

  let handoff: Awaited<ReturnType<typeof getOrCreateHandoff>>;
  try {
    handoff = await getOrCreateHandoff(c, c.state.workspaceId, c.state.repoId, handoffId, {
      workspaceId: c.state.workspaceId,
      repoId: c.state.repoId,
      handoffId,
      repoRemote: c.state.remoteUrl,
      repoLocalPath: localPath,
      branchName: initialBranchName,
      title: initialTitle,
      task: cmd.task,
      providerId: cmd.providerId,
      agentType: cmd.agentType,
      explicitTitle: onBranch ? null : cmd.explicitTitle,
      explicitBranchName: onBranch ? null : cmd.explicitBranchName,
    });
  } catch (error) {
    if (onBranch) {
      await c.db
        .delete(handoffIndex)
        .where(eq(handoffIndex.handoffId, handoffId))
        .run()
        .catch(() => {});
    }
    throw error;
  }

  if (!onBranch) {
    const now = Date.now();
    await c.db
      .insert(handoffIndex)
      .values({
        handoffId,
        branchName: initialBranchName,
        createdAt: now,
        updatedAt: now,
      })
      .onConflictDoNothing()
      .run();
  }

  const created = await handoff.initialize({ providerId: cmd.providerId });

  const history = await getOrCreateHistory(c, c.state.workspaceId, c.state.repoId);
  await history.append({
    kind: "handoff.created",
    handoffId,
    payload: {
      repoId: c.state.repoId,
      providerId: cmd.providerId,
    },
  });

  return created;
}

async function registerHandoffBranchMutation(c: any, cmd: RegisterHandoffBranchCommand): Promise<{ branchName: string; headSha: string }> {
  const localPath = await ensureProjectReady(c);

  const branchName = cmd.branchName.trim();
  const requireExistingRemote = cmd.requireExistingRemote === true;
  if (!branchName) {
    throw new Error("branchName is required");
  }

  await ensureHandoffIndexHydrated(c);

  const existingOwner = await c.db
    .select({ handoffId: handoffIndex.handoffId })
    .from(handoffIndex)
    .where(and(eq(handoffIndex.branchName, branchName), ne(handoffIndex.handoffId, cmd.handoffId)))
    .get();

  if (existingOwner) {
    let ownerMissing = false;
    try {
      const h = getHandoff(c, c.state.workspaceId, c.state.repoId, existingOwner.handoffId);
      await h.get();
    } catch (error) {
      if (isStaleHandoffReferenceError(error)) {
        ownerMissing = true;
        await deleteStaleHandoffIndexRow(c, existingOwner.handoffId);
        logActorWarning("project", "pruned stale handoff index row during branch registration", {
          workspaceId: c.state.workspaceId,
          repoId: c.state.repoId,
          handoffId: existingOwner.handoffId,
          branchName,
        });
      } else {
        throw error;
      }
    }
    if (!ownerMissing) {
      throw new Error(`branch is already assigned to a different handoff: ${branchName}`);
    }
  }

  const { driver } = getActorRuntimeContext();

  let headSha = "";
  let trackedInStack = false;
  let parentBranch: string | null = null;

  await withRepoGitLock(localPath, async () => {
    await driver.git.fetch(localPath);
    const baseRef = await driver.git.remoteDefaultBaseRef(localPath);
    const normalizedBase = normalizeBaseBranchName(baseRef);

    if (requireExistingRemote) {
      try {
        headSha = await driver.git.revParse(localPath, `origin/${branchName}`);
      } catch {
        throw new Error(`Remote branch not found: ${branchName}`);
      }
    } else {
      await driver.git.ensureRemoteBranch(localPath, branchName);
      await driver.git.fetch(localPath);
      try {
        headSha = await driver.git.revParse(localPath, `origin/${branchName}`);
      } catch {
        headSha = await driver.git.revParse(localPath, baseRef);
      }
    }

    if (await driver.stack.available(localPath).catch(() => false)) {
      let stackRows = await driver.stack.listStack(localPath).catch(() => []);
      let stackRow = stackRows.find((entry) => entry.branchName === branchName);

      if (!stackRow) {
        try {
          await driver.stack.trackBranch(localPath, branchName, normalizedBase);
        } catch (error) {
          logActorWarning("project", "stack track failed while registering branch", {
            workspaceId: c.state.workspaceId,
            repoId: c.state.repoId,
            branchName,
            error: resolveErrorMessage(error),
          });
        }
        stackRows = await driver.stack.listStack(localPath).catch(() => []);
        stackRow = stackRows.find((entry) => entry.branchName === branchName);
      }

      trackedInStack = Boolean(stackRow);
      parentBranch = stackRow?.parentBranch ?? null;
    }
  });

  const now = Date.now();
  await c.db
    .insert(branches)
    .values({
      branchName,
      commitSha: headSha,
      parentBranch,
      trackedInStack: trackedInStack ? 1 : 0,
      firstSeenAt: now,
      lastSeenAt: now,
      updatedAt: now,
    })
    .onConflictDoUpdate({
      target: branches.branchName,
      set: {
        commitSha: headSha,
        parentBranch,
        trackedInStack: trackedInStack ? 1 : 0,
        lastSeenAt: now,
        updatedAt: now,
      },
    })
    .run();

  await c.db
    .insert(handoffIndex)
    .values({
      handoffId: cmd.handoffId,
      branchName,
      createdAt: now,
      updatedAt: now,
    })
    .onConflictDoUpdate({
      target: handoffIndex.handoffId,
      set: {
        branchName,
        updatedAt: now,
      },
    })
    .run();

  return { branchName, headSha };
}

async function runRepoStackActionMutation(c: any, cmd: RunRepoStackActionCommand): Promise<RepoStackActionResult> {
  const localPath = await ensureProjectReady(c);
  await ensureHandoffIndexHydrated(c);

  const { driver } = getActorRuntimeContext();
  const at = Date.now();
  const action = cmd.action;
  const branchName = cmd.branchName?.trim() || null;
  const parentBranch = cmd.parentBranch?.trim() || null;

  if (!(await driver.stack.available(localPath).catch(() => false))) {
    return {
      action,
      executed: false,
      message: "git-spice is not available for this repo",
      at,
    };
  }

  if ((action === "restack_subtree" || action === "rebase_branch" || action === "reparent_branch") && !branchName) {
    throw new Error(`branchName is required for action: ${action}`);
  }
  if (action === "reparent_branch" && !parentBranch) {
    throw new Error("parentBranch is required for action: reparent_branch");
  }

  await forceProjectSync(c, localPath);

  if (branchName) {
    const row = await c.db.select({ branchName: branches.branchName }).from(branches).where(eq(branches.branchName, branchName)).get();
    if (!row) {
      throw new Error(`Branch not found in repo snapshot: ${branchName}`);
    }
  }

  if (action === "reparent_branch") {
    if (!parentBranch) {
      throw new Error("parentBranch is required for action: reparent_branch");
    }
    if (parentBranch === branchName) {
      throw new Error("parentBranch must be different from branchName");
    }
    const parentRow = await c.db.select({ branchName: branches.branchName }).from(branches).where(eq(branches.branchName, parentBranch)).get();
    if (!parentRow) {
      throw new Error(`Parent branch not found in repo snapshot: ${parentBranch}`);
    }
  }

  await withRepoGitLock(localPath, async () => {
    if (action === "sync_repo") {
      await driver.stack.syncRepo(localPath);
    } else if (action === "restack_repo") {
      await driver.stack.restackRepo(localPath);
    } else if (action === "restack_subtree") {
      await driver.stack.restackSubtree(localPath, branchName!);
    } else if (action === "rebase_branch") {
      await driver.stack.rebaseBranch(localPath, branchName!);
    } else if (action === "reparent_branch") {
      await driver.stack.reparentBranch(localPath, branchName!, parentBranch!);
    } else {
      throw new Error(`Unsupported repo stack action: ${action}`);
    }
  });

  await forceProjectSync(c, localPath);

  try {
    const history = await getOrCreateHistory(c, c.state.workspaceId, c.state.repoId);
    await history.append({
      kind: "repo.stack_action",
      branchName: branchName ?? null,
      payload: {
        action,
        branchName: branchName ?? null,
        parentBranch: parentBranch ?? null,
      },
    });
  } catch (error) {
    logActorWarning("project", "failed appending repo stack history event", {
      workspaceId: c.state.workspaceId,
      repoId: c.state.repoId,
      action,
      error: resolveErrorMessage(error),
    });
  }

  return {
    action,
    executed: true,
    message: `stack action executed: ${action}`,
    at,
  };
}

async function applyPrSyncResultMutation(c: any, body: PrSyncResult): Promise<void> {
  await c.db.delete(prCache).run();

  for (const item of body.items) {
    await c.db
      .insert(prCache)
      .values({
        branchName: item.headRefName,
        prNumber: item.number,
        state: item.state,
        title: item.title,
        prUrl: item.url ?? null,
        prAuthor: item.author ?? null,
        isDraft: item.isDraft ? 1 : 0,
        ciStatus: item.ciStatus ?? null,
        reviewStatus: item.reviewStatus ?? null,
        reviewer: item.reviewer ?? null,
        fetchedAt: body.at,
        updatedAt: body.at,
      })
      .onConflictDoUpdate({
        target: prCache.branchName,
        set: {
          prNumber: item.number,
          state: item.state,
          title: item.title,
          prUrl: item.url ?? null,
          prAuthor: item.author ?? null,
          isDraft: item.isDraft ? 1 : 0,
          ciStatus: item.ciStatus ?? null,
          reviewStatus: item.reviewStatus ?? null,
          reviewer: item.reviewer ?? null,
          fetchedAt: body.at,
          updatedAt: body.at,
        },
      })
      .run();
  }

  for (const item of body.items) {
    if (item.state !== "MERGED" && item.state !== "CLOSED") {
      continue;
    }

    const row = await c.db.select({ handoffId: handoffIndex.handoffId }).from(handoffIndex).where(eq(handoffIndex.branchName, item.headRefName)).get();
    if (!row) {
      continue;
    }

    try {
      const h = getHandoff(c, c.state.workspaceId, c.state.repoId, row.handoffId);
      await h.archive({ reason: `PR ${item.state.toLowerCase()}` });
    } catch (error) {
      if (isStaleHandoffReferenceError(error)) {
        await deleteStaleHandoffIndexRow(c, row.handoffId);
        logActorWarning("project", "pruned stale handoff index row during PR close archive", {
          workspaceId: c.state.workspaceId,
          repoId: c.state.repoId,
          handoffId: row.handoffId,
          branchName: item.headRefName,
          prState: item.state,
        });
        continue;
      }
      logActorWarning("project", "failed to auto-archive handoff after PR close", {
        workspaceId: c.state.workspaceId,
        repoId: c.state.repoId,
        handoffId: row.handoffId,
        branchName: item.headRefName,
        prState: item.state,
        error: resolveErrorMessage(error),
      });
    }
  }
}

async function applyBranchSyncResultMutation(c: any, body: BranchSyncResult): Promise<void> {
  const incoming = new Set(body.items.map((item) => item.branchName));

  for (const item of body.items) {
    const existing = await c.db
      .select({
        firstSeenAt: branches.firstSeenAt,
      })
      .from(branches)
      .where(eq(branches.branchName, item.branchName))
      .get();

    await c.db
      .insert(branches)
      .values({
        branchName: item.branchName,
        commitSha: item.commitSha,
        parentBranch: item.parentBranch ?? null,
        trackedInStack: item.trackedInStack ? 1 : 0,
        diffStat: item.diffStat ?? null,
        hasUnpushed: item.hasUnpushed ? 1 : 0,
        conflictsWithMain: item.conflictsWithMain ? 1 : 0,
        firstSeenAt: existing?.firstSeenAt ?? body.at,
        lastSeenAt: body.at,
        updatedAt: body.at,
      })
      .onConflictDoUpdate({
        target: branches.branchName,
        set: {
          commitSha: item.commitSha,
          parentBranch: item.parentBranch ?? null,
          trackedInStack: item.trackedInStack ? 1 : 0,
          diffStat: item.diffStat ?? null,
          hasUnpushed: item.hasUnpushed ? 1 : 0,
          conflictsWithMain: item.conflictsWithMain ? 1 : 0,
          firstSeenAt: existing?.firstSeenAt ?? body.at,
          lastSeenAt: body.at,
          updatedAt: body.at,
        },
      })
      .run();
  }

  const existingRows = await c.db.select({ branchName: branches.branchName }).from(branches).all();

  for (const row of existingRows) {
    if (incoming.has(row.branchName)) {
      continue;
    }
    await c.db.delete(branches).where(eq(branches.branchName, row.branchName)).run();
  }
}

export async function runProjectWorkflow(ctx: any): Promise<void> {
  await ctx.loop("project-command-loop", async (loopCtx: any) => {
    const msg = await loopCtx.queue.next("next-project-command", {
      names: [...PROJECT_QUEUE_NAMES],
      completable: true,
    });
    if (!msg) {
      return Loop.continue(undefined);
    }

    if (msg.name === "project.command.ensure") {
      const result = await loopCtx.step({
        name: "project-ensure",
        timeout: 5 * 60_000,
        run: async () => ensureProjectMutation(loopCtx, msg.body as EnsureProjectCommand),
      });
      await msg.complete(result);
      return Loop.continue(undefined);
    }

    if (msg.name === "project.command.hydrateHandoffIndex") {
      await loopCtx.step("project-hydrate-handoff-index", async () => hydrateHandoffIndexMutation(loopCtx, msg.body as HydrateHandoffIndexCommand));
      await msg.complete({ ok: true });
      return Loop.continue(undefined);
    }

    if (msg.name === "project.command.createHandoff") {
      const result = await loopCtx.step({
        name: "project-create-handoff",
        timeout: 12 * 60_000,
        run: async () => createHandoffMutation(loopCtx, msg.body as CreateHandoffCommand),
      });
      await msg.complete(result);
      return Loop.continue(undefined);
    }

    if (msg.name === "project.command.registerHandoffBranch") {
      const result = await loopCtx.step({
        name: "project-register-handoff-branch",
        timeout: 5 * 60_000,
        run: async () => registerHandoffBranchMutation(loopCtx, msg.body as RegisterHandoffBranchCommand),
      });
      await msg.complete(result);
      return Loop.continue(undefined);
    }

    if (msg.name === "project.command.runRepoStackAction") {
      const result = await loopCtx.step({
        name: "project-run-repo-stack-action",
        timeout: 12 * 60_000,
        run: async () => runRepoStackActionMutation(loopCtx, msg.body as RunRepoStackActionCommand),
      });
      await msg.complete(result);
      return Loop.continue(undefined);
    }

    if (msg.name === "project.command.applyPrSyncResult") {
      await loopCtx.step({
        name: "project-apply-pr-sync-result",
        timeout: 60_000,
        run: async () => applyPrSyncResultMutation(loopCtx, msg.body as PrSyncResult),
      });
      await msg.complete({ ok: true });
      return Loop.continue(undefined);
    }

    if (msg.name === "project.command.applyBranchSyncResult") {
      await loopCtx.step({
        name: "project-apply-branch-sync-result",
        timeout: 60_000,
        run: async () => applyBranchSyncResultMutation(loopCtx, msg.body as BranchSyncResult),
      });
      await msg.complete({ ok: true });
    }

    return Loop.continue(undefined);
  });
}

export const projectActions = {
  async ensure(c: any, cmd: EnsureProjectCommand): Promise<EnsureProjectResult> {
    const self = selfProject(c);
    return expectQueueResponse<EnsureProjectResult>(
      await self.send(projectWorkflowQueueName("project.command.ensure"), cmd, {
        wait: true,
        timeout: 5 * 60_000,
      }),
    );
  },

  async createHandoff(c: any, cmd: CreateHandoffCommand): Promise<HandoffRecord> {
    const self = selfProject(c);
    return expectQueueResponse<HandoffRecord>(
      await self.send(projectWorkflowQueueName("project.command.createHandoff"), cmd, {
        wait: true,
        timeout: 12 * 60_000,
      }),
    );
  },

  async listReservedBranches(c: any, _cmd?: ListReservedBranchesCommand): Promise<string[]> {
    await ensureHandoffIndexHydratedForRead(c);

    const rows = await c.db.select({ branchName: handoffIndex.branchName }).from(handoffIndex).where(isNotNull(handoffIndex.branchName)).all();

    return rows.map((row) => row.branchName).filter((name): name is string => typeof name === "string" && name.trim().length > 0);
  },

  async registerHandoffBranch(c: any, cmd: RegisterHandoffBranchCommand): Promise<{ branchName: string; headSha: string }> {
    const self = selfProject(c);
    return expectQueueResponse<{ branchName: string; headSha: string }>(
      await self.send(projectWorkflowQueueName("project.command.registerHandoffBranch"), cmd, {
        wait: true,
        timeout: 5 * 60_000,
      }),
    );
  },

  async hydrateHandoffIndex(c: any, cmd?: HydrateHandoffIndexCommand): Promise<void> {
    const self = selfProject(c);
    await self.send(projectWorkflowQueueName("project.command.hydrateHandoffIndex"), cmd ?? {}, {
      wait: true,
      timeout: 60_000,
    });
  },

  async listHandoffSummaries(c: any, cmd?: ListHandoffSummariesCommand): Promise<HandoffSummary[]> {
    const body = cmd ?? {};
    const records: HandoffSummary[] = [];

    await ensureHandoffIndexHydratedForRead(c);

    const handoffRows = await c.db.select({ handoffId: handoffIndex.handoffId }).from(handoffIndex).orderBy(desc(handoffIndex.updatedAt)).all();

    for (const row of handoffRows) {
      try {
        const h = getHandoff(c, c.state.workspaceId, c.state.repoId, row.handoffId);
        const record = await h.get();

        if (!body.includeArchived && record.status === "archived") {
          continue;
        }

        records.push({
          workspaceId: record.workspaceId,
          repoId: record.repoId,
          handoffId: record.handoffId,
          branchName: record.branchName,
          title: record.title,
          status: record.status,
          updatedAt: record.updatedAt,
        });
      } catch (error) {
        if (isStaleHandoffReferenceError(error)) {
          await deleteStaleHandoffIndexRow(c, row.handoffId);
          logActorWarning("project", "pruned stale handoff index row during summary listing", {
            workspaceId: c.state.workspaceId,
            repoId: c.state.repoId,
            handoffId: row.handoffId,
          });
          continue;
        }
        logActorWarning("project", "failed loading handoff summary row", {
          workspaceId: c.state.workspaceId,
          repoId: c.state.repoId,
          handoffId: row.handoffId,
          error: resolveErrorMessage(error),
        });
      }
    }

    records.sort((a, b) => b.updatedAt - a.updatedAt);
    return records;
  },

  async getHandoffEnriched(c: any, cmd: GetHandoffEnrichedCommand): Promise<HandoffRecord> {
    await ensureHandoffIndexHydratedForRead(c);

    const row = await c.db.select({ handoffId: handoffIndex.handoffId }).from(handoffIndex).where(eq(handoffIndex.handoffId, cmd.handoffId)).get();
    if (!row) {
      throw new Error(`Unknown handoff in repo ${c.state.repoId}: ${cmd.handoffId}`);
    }

    try {
      const h = getHandoff(c, c.state.workspaceId, c.state.repoId, cmd.handoffId);
      const record = await h.get();
      return await enrichHandoffRecord(c, record);
    } catch (error) {
      if (isStaleHandoffReferenceError(error)) {
        await deleteStaleHandoffIndexRow(c, cmd.handoffId);
        throw new Error(`Unknown handoff in repo ${c.state.repoId}: ${cmd.handoffId}`);
      }
      throw error;
    }
  },

  async getRepoOverview(c: any, _cmd?: RepoOverviewCommand): Promise<RepoOverview> {
    const localPath = await ensureProjectReadyForRead(c);
    await ensureHandoffIndexHydratedForRead(c);
    await forceProjectSync(c, localPath);

    const { driver } = getActorRuntimeContext();
    const now = Date.now();
    const baseRef = await driver.git.remoteDefaultBaseRef(localPath).catch(() => null);
    const stackAvailable = await driver.stack.available(localPath).catch(() => false);

    const branchRowsRaw = await c.db
      .select({
        branchName: branches.branchName,
        commitSha: branches.commitSha,
        parentBranch: branches.parentBranch,
        trackedInStack: branches.trackedInStack,
        diffStat: branches.diffStat,
        hasUnpushed: branches.hasUnpushed,
        conflictsWithMain: branches.conflictsWithMain,
        firstSeenAt: branches.firstSeenAt,
        lastSeenAt: branches.lastSeenAt,
        updatedAt: branches.updatedAt,
      })
      .from(branches)
      .all();

    const handoffRows = await c.db
      .select({
        handoffId: handoffIndex.handoffId,
        branchName: handoffIndex.branchName,
        updatedAt: handoffIndex.updatedAt,
      })
      .from(handoffIndex)
      .all();

    const handoffMetaByBranch = new Map<string, { handoffId: string; title: string | null; status: HandoffRecord["status"] | null; updatedAt: number }>();

    for (const row of handoffRows) {
      if (!row.branchName) {
        continue;
      }
      try {
        const h = getHandoff(c, c.state.workspaceId, c.state.repoId, row.handoffId);
        const record = await h.get();
        handoffMetaByBranch.set(row.branchName, {
          handoffId: row.handoffId,
          title: record.title ?? null,
          status: record.status,
          updatedAt: record.updatedAt,
        });
      } catch (error) {
        if (isStaleHandoffReferenceError(error)) {
          await deleteStaleHandoffIndexRow(c, row.handoffId);
          logActorWarning("project", "pruned stale handoff index row during repo overview", {
            workspaceId: c.state.workspaceId,
            repoId: c.state.repoId,
            handoffId: row.handoffId,
            branchName: row.branchName,
          });
          continue;
        }
        logActorWarning("project", "failed loading handoff while building repo overview", {
          workspaceId: c.state.workspaceId,
          repoId: c.state.repoId,
          handoffId: row.handoffId,
          branchName: row.branchName,
          error: resolveErrorMessage(error),
        });
      }
    }

    const prRows = await c.db
      .select({
        branchName: prCache.branchName,
        prNumber: prCache.prNumber,
        prState: prCache.state,
        prUrl: prCache.prUrl,
        ciStatus: prCache.ciStatus,
        reviewStatus: prCache.reviewStatus,
        reviewer: prCache.reviewer,
      })
      .from(prCache)
      .all();
    const prByBranch = new Map(prRows.map((row) => [row.branchName, row]));

    const combinedRows = sortBranchesForOverview(
      branchRowsRaw.map((row) => ({
        branchName: row.branchName,
        parentBranch: row.parentBranch ?? null,
        updatedAt: row.updatedAt,
      })),
    );

    const detailByBranch = new Map(branchRowsRaw.map((row) => [row.branchName, row]));

    const branchRows = combinedRows.map((ordering) => {
      const row = detailByBranch.get(ordering.branchName)!;
      const handoffMeta = handoffMetaByBranch.get(row.branchName);
      const pr = prByBranch.get(row.branchName);
      return {
        branchName: row.branchName,
        commitSha: row.commitSha,
        parentBranch: row.parentBranch ?? null,
        trackedInStack: Boolean(row.trackedInStack),
        diffStat: row.diffStat ?? null,
        hasUnpushed: Boolean(row.hasUnpushed),
        conflictsWithMain: Boolean(row.conflictsWithMain),
        handoffId: handoffMeta?.handoffId ?? null,
        handoffTitle: handoffMeta?.title ?? null,
        handoffStatus: handoffMeta?.status ?? null,
        prNumber: pr?.prNumber ?? null,
        prState: pr?.prState ?? null,
        prUrl: pr?.prUrl ?? null,
        ciStatus: pr?.ciStatus ?? null,
        reviewStatus: pr?.reviewStatus ?? null,
        reviewer: pr?.reviewer ?? null,
        firstSeenAt: row.firstSeenAt ?? null,
        lastSeenAt: row.lastSeenAt ?? null,
        updatedAt: Math.max(row.updatedAt, handoffMeta?.updatedAt ?? 0),
      };
    });

    return {
      workspaceId: c.state.workspaceId,
      repoId: c.state.repoId,
      remoteUrl: c.state.remoteUrl,
      baseRef,
      stackAvailable,
      fetchedAt: now,
      branches: branchRows,
    };
  },

  async getPullRequestForBranch(c: any, cmd: GetPullRequestForBranchCommand): Promise<{ number: number; status: "draft" | "ready" } | null> {
    const branchName = cmd.branchName?.trim();
    if (!branchName) {
      return null;
    }

    const pr = await c.db
      .select({
        prNumber: prCache.prNumber,
        prState: prCache.state,
      })
      .from(prCache)
      .where(eq(prCache.branchName, branchName))
      .get();

    if (!pr?.prNumber) {
      return null;
    }

    return {
      number: pr.prNumber,
      status: pr.prState === "draft" ? "draft" : "ready",
    };
  },

  async runRepoStackAction(c: any, cmd: RunRepoStackActionCommand): Promise<RepoStackActionResult> {
    const self = selfProject(c);
    return expectQueueResponse<RepoStackActionResult>(
      await self.send(projectWorkflowQueueName("project.command.runRepoStackAction"), cmd, {
        wait: true,
        timeout: 12 * 60_000,
      }),
    );
  },

  async applyPrSyncResult(c: any, body: PrSyncResult): Promise<void> {
    const self = selfProject(c);
    await self.send(projectWorkflowQueueName("project.command.applyPrSyncResult"), body, {
      wait: true,
      timeout: 5 * 60_000,
    });
  },

  async applyBranchSyncResult(c: any, body: BranchSyncResult): Promise<void> {
    const self = selfProject(c);
    await self.send(projectWorkflowQueueName("project.command.applyBranchSyncResult"), body, {
      wait: true,
      timeout: 5 * 60_000,
    });
  },
};