import { and, eq } from "drizzle-orm";
import { Router, type Request, type Response } from "express";
import type { Db } from "@paperclipai/db";
import { issues, projects, projectWorkspaces } from "@paperclipai/db";
import {
  findWorkspaceCommandDefinition,
  matchWorkspaceRuntimeServiceToCommand,
  updateExecutionWorkspaceSchema,
  workspaceRuntimeControlTargetSchema,
} from "@paperclipai/shared";
import { validate } from "../middleware/validate.js";
import { executionWorkspaceService, logActivity, workspaceOperationService } from "../services/index.js";
import { mergeExecutionWorkspaceConfig, readExecutionWorkspaceConfig } from "../services/execution-workspaces.js";
import { parseProjectExecutionWorkspacePolicy } from "../services/execution-workspace-policy.js";
import { readProjectWorkspaceRuntimeConfig } from "../services/project-workspace-runtime-config.js";
import {
  buildWorkspaceRuntimeDesiredStatePatch,
  cleanupExecutionWorkspaceArtifacts,
  ensurePersistedExecutionWorkspaceAvailable,
  listConfiguredRuntimeServiceEntries,
  runWorkspaceJobForControl,
  startRuntimeServicesForWorkspaceControl,
  stopRuntimeServicesForExecutionWorkspace,
} from "../services/workspace-runtime.js";
import { assertCompanyAccess, getActorInfo } from "./authz.js";
import {
  assertNoAgentHostWorkspaceCommandMutation,
  collectExecutionWorkspaceCommandPaths,
} from "./workspace-command-authz.js";
import { assertCanManageExecutionWorkspaceRuntimeServices } from "./workspace-runtime-service-authz.js";
import { appendWithCap } from "../adapters/utils.js";

const WORKSPACE_CONTROL_OUTPUT_MAX_CHARS = 256 * 1024;

export function executionWorkspaceRoutes(db: Db) {
  const router = Router();
  const svc = executionWorkspaceService(db);
  const workspaceOperationsSvc = workspaceOperationService(db);

  router.get("/companies/:companyId/execution-workspaces", async (req, res) => {
    const companyId = req.params.companyId as string;
    assertCompanyAccess(req, companyId);
    const filters = {
      projectId: req.query.projectId as string | undefined,
      projectWorkspaceId: req.query.projectWorkspaceId as string | undefined,
      issueId: req.query.issueId as string | undefined,
      status: req.query.status as string | undefined,
      reuseEligible: req.query.reuseEligible === "true",
    };
    const workspaces = req.query.summary === "true"
      ? await svc.listSummaries(companyId, filters)
      : await svc.list(companyId, filters);
    res.json(workspaces);
  });

  router.get("/execution-workspaces/:id", async (req, res) => {
    const id = req.params.id as string;
    const workspace = await svc.getById(id);
    if (!workspace) {
      res.status(404).json({ error: "Execution workspace not found" });
      return;
    }
    assertCompanyAccess(req, workspace.companyId);
    res.json(workspace);
  });

  router.get("/execution-workspaces/:id/close-readiness", async (req, res) => {
    const id = req.params.id as string;
    const workspace = await svc.getById(id);
    if (!workspace) {
      res.status(404).json({ error: "Execution workspace not found" });
      return;
    }
    assertCompanyAccess(req, workspace.companyId);
    const readiness = await svc.getCloseReadiness(id);
    if (!readiness) {
      res.status(404).json({ error: "Execution workspace not found" });
      return;
    }
    res.json(readiness);
  });

  router.get("/execution-workspaces/:id/workspace-operations", async (req, res) => {
    const id = req.params.id as string;
    const workspace = await svc.getById(id);
    if (!workspace) {
      res.status(404).json({ error: "Execution workspace not found" });
      return;
    }
    assertCompanyAccess(req, workspace.companyId);
    const operations = await workspaceOperationsSvc.listForExecutionWorkspace(id);
    res.json(operations);
  });

  async function handleExecutionWorkspaceRuntimeCommand(req: Request, res: Response) {
    const id = req.params.id as string;
    const action = String(req.params.action ?? "").trim().toLowerCase();
    if (action !== "start" && action !== "stop" && action !== "restart" && action !== "run") {
      res.status(404).json({ error: "Workspace command action not found" });
      return;
    }

    const existing = await svc.getById(id);
    if (!existing) {
      res.status(404).json({ error: "Execution workspace not found" });
      return;
    }
    assertCompanyAccess(req, existing.companyId);

    await assertCanManageExecutionWorkspaceRuntimeServices(db, req, {
      companyId: existing.companyId,
      executionWorkspaceId: existing.id,
      sourceIssueId: existing.sourceIssueId,
    });

    const workspaceCwd = existing.cwd;
    if (!workspaceCwd) {
      res.status(422).json({ error: "Execution workspace needs a local path before Paperclip can run workspace commands" });
      return;
    }

    const projectWorkspace = existing.projectWorkspaceId
      ? await db
          .select({
            id: projectWorkspaces.id,
            cwd: projectWorkspaces.cwd,
            repoUrl: projectWorkspaces.repoUrl,
            repoRef: projectWorkspaces.repoRef,
            defaultRef: projectWorkspaces.defaultRef,
            metadata: projectWorkspaces.metadata,
          })
          .from(projectWorkspaces)
          .where(
            and(
              eq(projectWorkspaces.id, existing.projectWorkspaceId),
              eq(projectWorkspaces.companyId, existing.companyId),
            ),
          )
          .then((rows) => rows[0] ?? null)
      : null;
    const projectWorkspaceRuntime = readProjectWorkspaceRuntimeConfig(
      (projectWorkspace?.metadata as Record<string, unknown> | null) ?? null,
    )?.workspaceRuntime ?? null;
    const projectPolicy = existing.projectId
      ? await db
          .select({
            executionWorkspacePolicy: projects.executionWorkspacePolicy,
          })
          .from(projects)
          .where(
            and(
              eq(projects.id, existing.projectId),
              eq(projects.companyId, existing.companyId),
            ),
          )
          .then((rows) => parseProjectExecutionWorkspacePolicy(rows[0]?.executionWorkspacePolicy))
      : null;
    const effectiveRuntimeConfig = existing.config?.workspaceRuntime ?? projectWorkspaceRuntime ?? null;
    const target = req.body as { workspaceCommandId?: string | null; runtimeServiceId?: string | null; serviceIndex?: number | null };
    const configuredServices = effectiveRuntimeConfig
      ? listConfiguredRuntimeServiceEntries({ workspaceRuntime: effectiveRuntimeConfig })
      : [];
    const workspaceCommand = effectiveRuntimeConfig
      ? findWorkspaceCommandDefinition(effectiveRuntimeConfig, target.workspaceCommandId ?? null)
      : null;
    if (target.workspaceCommandId && !workspaceCommand) {
      res.status(404).json({ error: "Workspace command not found for this execution workspace" });
      return;
    }
    if (target.runtimeServiceId && !(existing.runtimeServices ?? []).some((service) => service.id === target.runtimeServiceId)) {
      res.status(404).json({ error: "Runtime service not found for this execution workspace" });
      return;
    }
    const matchedRuntimeService =
      workspaceCommand?.kind === "service" && !target.runtimeServiceId
        ? matchWorkspaceRuntimeServiceToCommand(workspaceCommand, existing.runtimeServices ?? [])
        : null;
    const selectedRuntimeServiceId = target.runtimeServiceId ?? matchedRuntimeService?.id ?? null;
    const selectedServiceIndex =
      workspaceCommand?.kind === "service"
        ? workspaceCommand.serviceIndex
        : target.serviceIndex ?? null;
    if (
      selectedServiceIndex !== undefined
      && selectedServiceIndex !== null
      && (selectedServiceIndex < 0 || selectedServiceIndex >= configuredServices.length)
    ) {
      res.status(422).json({ error: "Selected runtime service is not defined in this execution workspace runtime config" });
      return;
    }
    if (workspaceCommand?.kind === "job" && action !== "run") {
      res.status(422).json({ error: `Workspace job "${workspaceCommand.name}" can only be run` });
      return;
    }
    if (workspaceCommand?.kind === "service" && action === "run") {
      res.status(422).json({ error: `Workspace service "${workspaceCommand.name}" should be started or restarted, not run` });
      return;
    }
    if (action === "run" && !workspaceCommand) {
      res.status(422).json({ error: "Select a workspace job to run" });
      return;
    }

    if ((action === "start" || action === "restart") && !effectiveRuntimeConfig) {
      res.status(422).json({ error: "Execution workspace has no workspace command configuration or inherited project workspace default" });
      return;
    }

    const actor = getActorInfo(req);
    const recorder = workspaceOperationsSvc.createRecorder({
      companyId: existing.companyId,
      executionWorkspaceId: existing.id,
    });
    let runtimeServiceCount = existing.runtimeServices?.length ?? 0;
    let stdout = "";
    let stderr = "";

    const operation = await recorder.recordOperation({
      phase: action === "stop" ? "workspace_teardown" : "workspace_provision",
      command: workspaceCommand?.command ?? `workspace command ${action}`,
      cwd: existing.cwd,
      metadata: {
        action,
        executionWorkspaceId: existing.id,
        workspaceCommandId: workspaceCommand?.id ?? target.workspaceCommandId ?? null,
        workspaceCommandKind: workspaceCommand?.kind ?? null,
        workspaceCommandName: workspaceCommand?.name ?? null,
        runtimeServiceId: selectedRuntimeServiceId,
        serviceIndex: selectedServiceIndex,
      },
      run: async () => {
        const ensureWorkspaceAvailable = async () =>
          await ensurePersistedExecutionWorkspaceAvailable({
            base: {
              baseCwd: projectWorkspace?.cwd ?? workspaceCwd,
              source: existing.mode === "shared_workspace" ? "project_primary" : "task_session",
              projectId: existing.projectId,
              workspaceId: existing.projectWorkspaceId,
              repoUrl: existing.repoUrl,
              repoRef: existing.baseRef,
            },
            workspace: {
              mode: existing.mode,
              strategyType: existing.strategyType,
              cwd: existing.cwd,
              providerRef: existing.providerRef,
              projectId: existing.projectId,
              projectWorkspaceId: existing.projectWorkspaceId,
              repoUrl: existing.repoUrl,
              baseRef: existing.baseRef,
              branchName: existing.branchName,
              config: {
                ...existing.config,
                provisionCommand:
                  existing.config?.provisionCommand
                  ?? projectPolicy?.workspaceStrategy?.provisionCommand
                  ?? null,
              },
            },
            issue: existing.sourceIssueId
              ? {
                  id: existing.sourceIssueId,
                  identifier: null,
                  title: existing.name,
                }
              : null,
            agent: {
              id: actor.agentId ?? null,
              name: actor.actorType === "user" ? "Board" : "Agent",
              companyId: existing.companyId,
            },
            recorder,
          });

        if (action === "run") {
          if (!workspaceCommand || workspaceCommand.kind !== "job") {
            throw new Error("Workspace job selection is required");
          }
          const availableWorkspace = await ensureWorkspaceAvailable();
          if (!availableWorkspace) {
            throw new Error("Execution workspace needs a local path before Paperclip can run workspace commands");
          }
          return await runWorkspaceJobForControl({
            actor: {
              id: actor.agentId ?? null,
              name: actor.actorType === "user" ? "Board" : "Agent",
              companyId: existing.companyId,
            },
            issue: existing.sourceIssueId
              ? {
                  id: existing.sourceIssueId,
                  identifier: null,
                  title: existing.name,
                }
              : null,
            workspace: availableWorkspace,
            command: workspaceCommand.rawConfig,
            adapterEnv: {},
            recorder,
            metadata: {
              action,
              executionWorkspaceId: existing.id,
              workspaceCommandId: workspaceCommand.id,
            },
          }).then((nestedOperation) => ({
            status: "succeeded" as const,
            exitCode: 0,
            metadata: {
              nestedOperationId: nestedOperation?.id ?? null,
              runtimeServiceCount,
            },
          }));
        }

        const onLog = async (stream: "stdout" | "stderr", chunk: string) => {
          if (stream === "stdout") stdout = appendWithCap(stdout, chunk, WORKSPACE_CONTROL_OUTPUT_MAX_CHARS);
          else stderr = appendWithCap(stderr, chunk, WORKSPACE_CONTROL_OUTPUT_MAX_CHARS);
        };

        if (action === "stop" || action === "restart") {
          await stopRuntimeServicesForExecutionWorkspace({
            db,
            executionWorkspaceId: existing.id,
            workspaceCwd,
            runtimeServiceId: selectedRuntimeServiceId,
          });
        }

        if (action === "start" || action === "restart") {
          const availableWorkspace = await ensureWorkspaceAvailable();
          if (!availableWorkspace) {
            throw new Error("Execution workspace needs a local path before Paperclip can manage local runtime services");
          }
          const startedServices = await startRuntimeServicesForWorkspaceControl({
            db,
            actor: {
              id: actor.agentId ?? null,
              name: actor.actorType === "user" ? "Board" : "Agent",
              companyId: existing.companyId,
            },
            issue: existing.sourceIssueId
              ? {
                  id: existing.sourceIssueId,
                  identifier: null,
                  title: existing.name,
                }
              : null,
            workspace: availableWorkspace,
            executionWorkspaceId: existing.id,
            config: { workspaceRuntime: effectiveRuntimeConfig },
            adapterEnv: {},
            onLog,
            serviceIndex: selectedServiceIndex,
          });
          runtimeServiceCount = startedServices.length;
        } else {
          runtimeServiceCount = selectedRuntimeServiceId ? Math.max(0, (existing.runtimeServices?.length ?? 1) - 1) : 0;
        }

        const currentDesiredState: "running" | "stopped" =
          existing.config?.desiredState
          ?? ((existing.runtimeServices ?? []).some((service) => service.status === "starting" || service.status === "running")
            ? "running"
            : "stopped");
        const nextRuntimeState: {
          desiredState: "running" | "stopped";
          serviceStates: Record<string, "running" | "stopped"> | null | undefined;
        } = selectedRuntimeServiceId && (selectedServiceIndex === undefined || selectedServiceIndex === null)
          ? {
              desiredState: currentDesiredState,
              serviceStates: existing.config?.serviceStates ?? null,
            }
          : buildWorkspaceRuntimeDesiredStatePatch({
              config: { workspaceRuntime: effectiveRuntimeConfig },
              currentDesiredState,
              currentServiceStates: existing.config?.serviceStates ?? null,
              action,
              serviceIndex: selectedServiceIndex,
            });
        const metadata = mergeExecutionWorkspaceConfig(existing.metadata as Record<string, unknown> | null, {
          desiredState: nextRuntimeState.desiredState,
          serviceStates: nextRuntimeState.serviceStates,
        });
        await svc.update(existing.id, { metadata });

        return {
          status: "succeeded",
          stdout,
          stderr,
          system:
            action === "stop"
              ? "Stopped execution workspace runtime services.\n"
              : action === "restart"
                ? "Restarted execution workspace runtime services.\n"
                : "Started execution workspace runtime services.\n",
          metadata: {
            runtimeServiceCount,
            workspaceCommandId: workspaceCommand?.id ?? target.workspaceCommandId ?? null,
            runtimeServiceId: selectedRuntimeServiceId,
            serviceIndex: selectedServiceIndex,
          },
        };
      },
    });

    const workspace = await svc.getById(id);
    if (!workspace) {
      res.status(404).json({ error: "Execution workspace not found" });
      return;
    }

    await logActivity(db, {
      companyId: existing.companyId,
      actorType: actor.actorType,
      actorId: actor.actorId,
      agentId: actor.agentId,
      runId: actor.runId,
      action: `execution_workspace.runtime_${action}`,
      entityType: "execution_workspace",
      entityId: existing.id,
      details: {
        runtimeServiceCount,
        workspaceCommandId: workspaceCommand?.id ?? target.workspaceCommandId ?? null,
        workspaceCommandKind: workspaceCommand?.kind ?? null,
        workspaceCommandName: workspaceCommand?.name ?? null,
        runtimeServiceId: selectedRuntimeServiceId,
        serviceIndex: selectedServiceIndex,
      },
    });

    res.json({
      workspace,
      operation,
    });
  }

  router.post("/execution-workspaces/:id/runtime-services/:action", validate(workspaceRuntimeControlTargetSchema), handleExecutionWorkspaceRuntimeCommand);
  router.post("/execution-workspaces/:id/runtime-commands/:action", validate(workspaceRuntimeControlTargetSchema), handleExecutionWorkspaceRuntimeCommand);

  router.patch("/execution-workspaces/:id", validate(updateExecutionWorkspaceSchema), async (req, res) => {
    const id = req.params.id as string;
    const existing = await svc.getById(id);
    if (!existing) {
      res.status(404).json({ error: "Execution workspace not found" });
      return;
    }
    assertCompanyAccess(req, existing.companyId);
    assertNoAgentHostWorkspaceCommandMutation(
      req,
      collectExecutionWorkspaceCommandPaths({
        config: req.body.config,
        metadata: req.body.metadata,
      }),
    );
    const patch: Record<string, unknown> = {
      ...(req.body.name === undefined ? {} : { name: req.body.name }),
      ...(req.body.cwd === undefined ? {} : { cwd: req.body.cwd }),
      ...(req.body.repoUrl === undefined ? {} : { repoUrl: req.body.repoUrl }),
      ...(req.body.baseRef === undefined ? {} : { baseRef: req.body.baseRef }),
      ...(req.body.branchName === undefined ? {} : { branchName: req.body.branchName }),
      ...(req.body.providerRef === undefined ? {} : { providerRef: req.body.providerRef }),
      ...(req.body.status === undefined ? {} : { status: req.body.status }),
      ...(req.body.cleanupReason === undefined ? {} : { cleanupReason: req.body.cleanupReason }),
      ...(req.body.cleanupEligibleAt !== undefined
        ? { cleanupEligibleAt: req.body.cleanupEligibleAt ? new Date(req.body.cleanupEligibleAt) : null }
        : {}),
    };
    if (req.body.metadata !== undefined || req.body.config !== undefined) {
      const requestedMetadata = req.body.metadata === undefined
        ? (existing.metadata as Record<string, unknown> | null)
        : (req.body.metadata as Record<string, unknown> | null);
      patch.metadata = req.body.config === undefined
        ? requestedMetadata
        : mergeExecutionWorkspaceConfig(requestedMetadata, req.body.config ?? null);
    }
    let workspace = existing;
    let cleanupWarnings: string[] = [];
    const configForCleanup = readExecutionWorkspaceConfig(
      ((patch.metadata as Record<string, unknown> | null | undefined) ?? (existing.metadata as Record<string, unknown> | null)) ?? null,
    );

    if (req.body.status === "archived" && existing.status !== "archived") {
      const readiness = await svc.getCloseReadiness(existing.id);
      if (!readiness) {
        res.status(404).json({ error: "Execution workspace not found" });
        return;
      }

      if (readiness.state === "blocked") {
        res.status(409).json({
          error: readiness.blockingReasons[0] ?? "Execution workspace cannot be closed right now",
          closeReadiness: readiness,
        });
        return;
      }

      const closedAt = new Date();
      const archivedWorkspace = await svc.update(id, {
        ...patch,
        status: "archived",
        closedAt,
        cleanupReason: null,
      });
      if (!archivedWorkspace) {
        res.status(404).json({ error: "Execution workspace not found" });
        return;
      }
      workspace = archivedWorkspace;

      if (existing.mode === "shared_workspace") {
        await db
          .update(issues)
          .set({
            executionWorkspaceId: null,
            updatedAt: new Date(),
          })
          .where(
            and(
              eq(issues.companyId, existing.companyId),
              eq(issues.executionWorkspaceId, existing.id),
            ),
          );
      }

      try {
        await stopRuntimeServicesForExecutionWorkspace({
          db,
          executionWorkspaceId: existing.id,
          workspaceCwd: existing.cwd,
        });
        const projectWorkspace = existing.projectWorkspaceId
          ? await db
              .select({
                cwd: projectWorkspaces.cwd,
                cleanupCommand: projectWorkspaces.cleanupCommand,
              })
              .from(projectWorkspaces)
            .where(
                and(
                  eq(projectWorkspaces.id, existing.projectWorkspaceId),
                  eq(projectWorkspaces.companyId, existing.companyId),
                ),
              )
              .then((rows) => rows[0] ?? null)
          : null;
        const projectPolicy = existing.projectId
          ? await db
              .select({
                executionWorkspacePolicy: projects.executionWorkspacePolicy,
              })
              .from(projects)
              .where(and(eq(projects.id, existing.projectId), eq(projects.companyId, existing.companyId)))
              .then((rows) => parseProjectExecutionWorkspacePolicy(rows[0]?.executionWorkspacePolicy))
          : null;
        const cleanupResult = await cleanupExecutionWorkspaceArtifacts({
          workspace: existing,
          projectWorkspace,
          teardownCommand: configForCleanup?.teardownCommand ?? projectPolicy?.workspaceStrategy?.teardownCommand ?? null,
          cleanupCommand: configForCleanup?.cleanupCommand ?? null,
          recorder: workspaceOperationsSvc.createRecorder({
            companyId: existing.companyId,
            executionWorkspaceId: existing.id,
          }),
        });
        cleanupWarnings = cleanupResult.warnings;
        const cleanupPatch: Record<string, unknown> = {
          closedAt,
          cleanupReason: cleanupWarnings.length > 0 ? cleanupWarnings.join(" | ") : null,
        };
        if (!cleanupResult.cleaned) {
          cleanupPatch.status = "cleanup_failed";
        }
        if (cleanupResult.warnings.length > 0 || !cleanupResult.cleaned) {
          workspace = (await svc.update(id, cleanupPatch)) ?? workspace;
        }
      } catch (error) {
        const failureReason = error instanceof Error ? error.message : String(error);
        workspace =
          (await svc.update(id, {
            status: "cleanup_failed",
            closedAt,
            cleanupReason: failureReason,
          })) ?? workspace;
        res.status(500).json({
          error: `Failed to archive execution workspace: ${failureReason}`,
        });
        return;
      }
    } else {
      const updatedWorkspace = await svc.update(id, patch);
      if (!updatedWorkspace) {
        res.status(404).json({ error: "Execution workspace not found" });
        return;
      }
      workspace = updatedWorkspace;
    }
    const actor = getActorInfo(req);
    await logActivity(db, {
      companyId: existing.companyId,
      actorType: actor.actorType,
      actorId: actor.actorId,
      agentId: actor.agentId,
      runId: actor.runId,
      action: "execution_workspace.updated",
      entityType: "execution_workspace",
      entityId: workspace.id,
      details: {
        changedKeys: Object.keys(req.body).sort(),
        ...(cleanupWarnings.length > 0 ? { cleanupWarnings } : {}),
      },
    });
    res.json(workspace);
  });

  return router;
}