import { and, desc, eq, inArray } from "drizzle-orm";
import type { Db } from "@paperclipai/db";
import { executionWorkspaces, workspaceRuntimeServices } from "@paperclipai/db";
import type { ExecutionWorkspace, ExecutionWorkspaceConfig, WorkspaceRuntimeService } from "@paperclipai/shared";

type ExecutionWorkspaceRow = typeof executionWorkspaces.$inferSelect;
type WorkspaceRuntimeServiceRow = typeof workspaceRuntimeServices.$inferSelect;

function isRecord(value: unknown): value is Record<string, unknown> {
  return typeof value === "object" && value !== null && !Array.isArray(value);
}

function readNullableString(value: unknown): string | null {
  if (typeof value !== "string") return null;
  const trimmed = value.trim();
  return trimmed.length > 0 ? trimmed : null;
}

function cloneRecord(value: unknown): Record<string, unknown> | null {
  if (!isRecord(value)) return null;
  return { ...value };
}

export function readExecutionWorkspaceConfig(metadata: Record<string, unknown> | null | undefined): ExecutionWorkspaceConfig | null {
  const raw = isRecord(metadata?.config) ? metadata.config : null;
  if (!raw) return null;

  const config: ExecutionWorkspaceConfig = {
    provisionCommand: readNullableString(raw.provisionCommand),
    teardownCommand: readNullableString(raw.teardownCommand),
    cleanupCommand: readNullableString(raw.cleanupCommand),
    workspaceRuntime: cloneRecord(raw.workspaceRuntime),
  };

  const hasConfig = Object.values(config).some((value) => {
    if (value === null) return false;
    if (typeof value === "object") return Object.keys(value).length > 0;
    return true;
  });

  return hasConfig ? config : null;
}

export function mergeExecutionWorkspaceConfig(
  metadata: Record<string, unknown> | null | undefined,
  patch: Partial<ExecutionWorkspaceConfig> | null,
): Record<string, unknown> | null {
  const nextMetadata = isRecord(metadata) ? { ...metadata } : {};
  const current = readExecutionWorkspaceConfig(metadata) ?? {
    provisionCommand: null,
    teardownCommand: null,
    cleanupCommand: null,
    workspaceRuntime: null,
  };

  if (patch === null) {
    delete nextMetadata.config;
    return Object.keys(nextMetadata).length > 0 ? nextMetadata : null;
  }

  const nextConfig: ExecutionWorkspaceConfig = {
    provisionCommand: patch.provisionCommand !== undefined ? readNullableString(patch.provisionCommand) : current.provisionCommand,
    teardownCommand: patch.teardownCommand !== undefined ? readNullableString(patch.teardownCommand) : current.teardownCommand,
    cleanupCommand: patch.cleanupCommand !== undefined ? readNullableString(patch.cleanupCommand) : current.cleanupCommand,
    workspaceRuntime: patch.workspaceRuntime !== undefined ? cloneRecord(patch.workspaceRuntime) : current.workspaceRuntime,
  };

  const hasConfig = Object.values(nextConfig).some((value) => {
    if (value === null) return false;
    if (typeof value === "object") return Object.keys(value).length > 0;
    return true;
  });

  if (hasConfig) {
    nextMetadata.config = {
      provisionCommand: nextConfig.provisionCommand,
      teardownCommand: nextConfig.teardownCommand,
      cleanupCommand: nextConfig.cleanupCommand,
      workspaceRuntime: nextConfig.workspaceRuntime,
    };
  } else {
    delete nextMetadata.config;
  }

  return Object.keys(nextMetadata).length > 0 ? nextMetadata : null;
}

function toRuntimeService(row: WorkspaceRuntimeServiceRow): WorkspaceRuntimeService {
  return {
    id: row.id,
    companyId: row.companyId,
    projectId: row.projectId ?? null,
    projectWorkspaceId: row.projectWorkspaceId ?? null,
    executionWorkspaceId: row.executionWorkspaceId ?? null,
    issueId: row.issueId ?? null,
    scopeType: row.scopeType as WorkspaceRuntimeService["scopeType"],
    scopeId: row.scopeId ?? null,
    serviceName: row.serviceName,
    status: row.status as WorkspaceRuntimeService["status"],
    lifecycle: row.lifecycle as WorkspaceRuntimeService["lifecycle"],
    reuseKey: row.reuseKey ?? null,
    command: row.command ?? null,
    cwd: row.cwd ?? null,
    port: row.port ?? null,
    url: row.url ?? null,
    provider: row.provider as WorkspaceRuntimeService["provider"],
    providerRef: row.providerRef ?? null,
    ownerAgentId: row.ownerAgentId ?? null,
    startedByRunId: row.startedByRunId ?? null,
    lastUsedAt: row.lastUsedAt,
    startedAt: row.startedAt,
    stoppedAt: row.stoppedAt ?? null,
    stopPolicy: (row.stopPolicy as Record<string, unknown> | null) ?? null,
    healthStatus: row.healthStatus as WorkspaceRuntimeService["healthStatus"],
    createdAt: row.createdAt,
    updatedAt: row.updatedAt,
  };
}

function toExecutionWorkspace(
  row: ExecutionWorkspaceRow,
  runtimeServices: WorkspaceRuntimeService[] = [],
): ExecutionWorkspace {
  return {
    id: row.id,
    companyId: row.companyId,
    projectId: row.projectId,
    projectWorkspaceId: row.projectWorkspaceId ?? null,
    sourceIssueId: row.sourceIssueId ?? null,
    mode: row.mode as ExecutionWorkspace["mode"],
    strategyType: row.strategyType as ExecutionWorkspace["strategyType"],
    name: row.name,
    status: row.status as ExecutionWorkspace["status"],
    cwd: row.cwd ?? null,
    repoUrl: row.repoUrl ?? null,
    baseRef: row.baseRef ?? null,
    branchName: row.branchName ?? null,
    providerType: row.providerType as ExecutionWorkspace["providerType"],
    providerRef: row.providerRef ?? null,
    derivedFromExecutionWorkspaceId: row.derivedFromExecutionWorkspaceId ?? null,
    lastUsedAt: row.lastUsedAt,
    openedAt: row.openedAt,
    closedAt: row.closedAt ?? null,
    cleanupEligibleAt: row.cleanupEligibleAt ?? null,
    cleanupReason: row.cleanupReason ?? null,
    config: readExecutionWorkspaceConfig((row.metadata as Record<string, unknown> | null) ?? null),
    metadata: (row.metadata as Record<string, unknown> | null) ?? null,
    runtimeServices,
    createdAt: row.createdAt,
    updatedAt: row.updatedAt,
  };
}

export function executionWorkspaceService(db: Db) {
  return {
    list: async (companyId: string, filters?: {
      projectId?: string;
      projectWorkspaceId?: string;
      issueId?: string;
      status?: string;
      reuseEligible?: boolean;
    }) => {
      const conditions = [eq(executionWorkspaces.companyId, companyId)];
      if (filters?.projectId) conditions.push(eq(executionWorkspaces.projectId, filters.projectId));
      if (filters?.projectWorkspaceId) {
        conditions.push(eq(executionWorkspaces.projectWorkspaceId, filters.projectWorkspaceId));
      }
      if (filters?.issueId) conditions.push(eq(executionWorkspaces.sourceIssueId, filters.issueId));
      if (filters?.status) {
        const statuses = filters.status.split(",").map((value) => value.trim()).filter(Boolean);
        if (statuses.length === 1) conditions.push(eq(executionWorkspaces.status, statuses[0]!));
        else if (statuses.length > 1) conditions.push(inArray(executionWorkspaces.status, statuses));
      }
      if (filters?.reuseEligible) {
        conditions.push(inArray(executionWorkspaces.status, ["active", "idle", "in_review"]));
      }

      const rows = await db
        .select()
        .from(executionWorkspaces)
        .where(and(...conditions))
        .orderBy(desc(executionWorkspaces.lastUsedAt), desc(executionWorkspaces.createdAt));
      return rows.map((row) => toExecutionWorkspace(row));
    },

    getById: async (id: string) => {
      const row = await db
        .select()
        .from(executionWorkspaces)
        .where(eq(executionWorkspaces.id, id))
        .then((rows) => rows[0] ?? null);
      if (!row) return null;
      const runtimeServiceRows = await db
        .select()
        .from(workspaceRuntimeServices)
        .where(eq(workspaceRuntimeServices.executionWorkspaceId, row.id))
        .orderBy(desc(workspaceRuntimeServices.updatedAt), desc(workspaceRuntimeServices.createdAt));
      return toExecutionWorkspace(row, runtimeServiceRows.map(toRuntimeService));
    },

    create: async (data: typeof executionWorkspaces.$inferInsert) => {
      const row = await db
        .insert(executionWorkspaces)
        .values(data)
        .returning()
        .then((rows) => rows[0] ?? null);
      return row ? toExecutionWorkspace(row) : null;
    },

    update: async (id: string, patch: Partial<typeof executionWorkspaces.$inferInsert>) => {
      const row = await db
        .update(executionWorkspaces)
        .set({ ...patch, updatedAt: new Date() })
        .where(eq(executionWorkspaces.id, id))
        .returning()
        .then((rows) => rows[0] ?? null);
      return row ? toExecutionWorkspace(row) : null;
    },
  };
}

export { toExecutionWorkspace };