import type {
  AgentBrowserDetailsV1,
  ChangedFileDetailsV1,
  GameAssetsDetailsV1,
  KnownToolDetails,
  RuntimeContextDetailsV1,
  TaskStateDetailsV1,
} from './coding-conversation-contracts';

const PRODUCT_TOOL_NAMES = new Set([
  'agent_browser',
  'game_asset_browser',
  'game_asset_review',
  'task_state',
  'changed_file',
  'runtime_context',
]);

function record(value: unknown): Record<string, unknown> | null {
  return value !== null && typeof value === 'object' && !Array.isArray(value)
    ? value as Record<string, unknown>
    : null;
}

function text(value: unknown, max = 4096): string | null {
  return typeof value === 'string' && value.trim() && value.length <= max ? value : null;
}

function strings(value: unknown, maxItems = 200): string[] | null {
  if (!Array.isArray(value) || value.length > maxItems) return null;
  const result: string[] = [];
  for (const item of value) {
    const normalized = text(item);
    if (!normalized) return null;
    result.push(normalized);
  }
  return result;
}

function relativePaths(value: unknown): string[] | null {
  const paths = strings(value);
  if (!paths) return null;
  const result: string[] = [];
  for (const candidate of paths) {
    const normalized = candidate.replaceAll('\\', '/').replace(/^\.\//, '');
    if (!normalized || normalized.startsWith('/') || /^[A-Za-z]:\//.test(normalized)
      || normalized.split('/').some((segment) => segment === '..')) return null;
    result.push(normalized);
  }
  return result;
}

function browserDetails(value: Record<string, unknown>): AgentBrowserDetailsV1 | null {
  const actions = new Set([
    'open', 'status', 'close', 'reset_profile', 'navigate', 'send_cdp', 'read_events', 'read_payload',
  ]);
  if (!actions.has(String(value.action))) return null;
  const attachmentId = value.attachmentId === undefined ? undefined : text(value.attachmentId, 128);
  const mime = value.mime === undefined ? undefined : text(value.mime, 128);
  if ((value.attachmentId !== undefined && !attachmentId) || (value.mime !== undefined && !mime)) return null;
  if (Boolean(attachmentId) !== Boolean(mime) || (attachmentId && value.action !== 'send_cdp')) return null;
  return {
    schema: 'agent-browser.v1',
    action: value.action as AgentBrowserDetailsV1['action'],
    ...(attachmentId ? { attachmentId } : {}),
    ...(mime ? { mime } : {}),
  };
}

function gameAssetDetails(value: Record<string, unknown>): GameAssetsDetailsV1 | null {
  const invocationId = text(value.invocationId, 200);
  const candidateIds = strings(value.candidateIds);
  const pendingAssetIds = strings(value.pendingAssetIds);
  const approvedAssetIds = strings(value.approvedAssetIds);
  const discardedAssetIds = strings(value.discardedAssetIds);
  if (!invocationId || !candidateIds || !pendingAssetIds || !approvedAssetIds || !discardedAssetIds) return null;
  if (value.status !== 'pending' && value.status !== 'resolved') return null;
  return {
    schema: 'game-assets.v1',
    invocationId,
    candidateIds,
    status: value.status,
    pendingAssetIds,
    approvedAssetIds,
    discardedAssetIds,
  };
}

function taskDetails(value: Record<string, unknown>): TaskStateDetailsV1 | null {
  if (!Array.isArray(value.tasks) || value.tasks.length === 0 || value.tasks.length > 100) return null;
  const tasks: TaskStateDetailsV1['tasks'] = [];
  for (const candidate of value.tasks) {
    const item = record(candidate);
    const id = text(item?.id, 128);
    const title = text(item?.title, 500);
    if (!item || !id || !title || !['pending', 'running', 'complete', 'error'].includes(String(item.status))) {
      return null;
    }
    tasks.push({ id, title, status: item.status as TaskStateDetailsV1['tasks'][number]['status'] });
  }
  return { schema: 'task-state.v1', tasks };
}

function runtimeContextDetails(value: Record<string, unknown>): RuntimeContextDetailsV1 | null {
  if (!Array.isArray(value.skills) || value.skills.length > 100
    || !Array.isArray(value.commands) || value.commands.length > 200) return null;
  const skills: RuntimeContextDetailsV1['skills'] = [];
  const commands: RuntimeContextDetailsV1['commands'] = [];
  for (const candidate of value.skills) {
    const item = record(candidate);
    const id = text(item?.id, 128);
    const name = text(item?.name, 200);
    if (!item || !id || !name || typeof item.description !== 'string' || item.description.length > 2000
      || typeof item.selected !== 'boolean') return null;
    skills.push({ id, name, description: item.description, selected: item.selected });
  }
  for (const candidate of value.commands) {
    const item = record(candidate);
    const name = text(item?.name, 128);
    const title = text(item?.title, 200);
    if (!item || !name || !title || typeof item.description !== 'string' || item.description.length > 2000
      || !['makelore', 'pi', 'skill'].includes(String(item.source))) return null;
    const skillId = item.skillId === undefined ? undefined : text(item.skillId, 128);
    if (item.skillId !== undefined && !skillId) return null;
    commands.push({
      name,
      title,
      description: item.description,
      source: item.source as RuntimeContextDetailsV1['commands'][number]['source'],
      ...(skillId ? { skillId } : {}),
    });
  }
  return { schema: 'runtime-context.v1', skills, commands };
}

export function productToolDetails(value: unknown): Exclude<KnownToolDetails, { schema: 'subagent.v1' | 'write-lease.v1' }> | null {
  const details = record(value);
  if (!details) return null;
  if (details.schema === 'changed-file.v1') {
    const paths = relativePaths(details.paths);
    return paths ? { schema: 'changed-file.v1', paths } satisfies ChangedFileDetailsV1 : null;
  }
  if (details.schema === 'task-state.v1') return taskDetails(details);
  if (details.schema === 'agent-browser.v1') return browserDetails(details);
  if (details.schema === 'game-assets.v1') return gameAssetDetails(details);
  if (details.schema === 'runtime-context.v1') return runtimeContextDetails(details);
  return null;
}

export function productToolDetailsOfResult(value: unknown) {
  return productToolDetails(record(value)?.details);
}

export function isProductToolName(value: string): boolean {
  return PRODUCT_TOOL_NAMES.has(value);
}