import type {
  AgentBrowserDetailsV1,
  CapabilityBillingReceiptV1,
  CapabilityResultV1,
  ChangedFileDetailsV1,
  GameAssetsDetailsV1,
  KnownToolDetails,
  RuntimeContextDetailsV1,
  TaskStateDetailsV1,
} from './coding-conversation-contracts';
import type { ModelToolDetailsV1, ModelWebSearchErrorCode } from './model-tools';
import {
  DEVICE_PACKAGE_TOOL_NAMES,
  type DevicePackageIndexV1,
  type DevicePackageRecordV1,
  type DevicePackageToolDetailsV1,
  type InstallPreviewV1,
} from './device-packages';
import { DATA_SERVICE_PI_TOOL_NAMES } from './data-service';

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

const CAPABILITY_CONTEXT_KEYS = new Set([
  'resource', 'limit', 'current', 'attempted', 'actual', 'current_revision',
]);
const CAPABILITY_CONTEXT_RESOURCES = new Set(['instances', 'collections', 'documents', 'bytes']);
const CAPABILITY_ID_PATTERN = /^[a-z][a-z0-9.-]{0,63}$/u;
const CAPABILITY_OPERATION_PATTERN = /^[a-z][a-z0-9._-]{0,63}$/u;
const CAPABILITY_PLUGIN_ID_PATTERN = /^[a-z][a-z0-9.-]{0,47}$/u;
const CAPABILITY_DECIMAL_PATTERN = /^(?:0|[1-9]\d*)(?:\.\d+)?$/u;
const MAX_CAPABILITY_DATA_BYTES = 1_310_720;

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 };
}

function capabilityContext(value: unknown): Readonly<Record<string, string | number>> | undefined | null {
  if (value === undefined) return undefined;
  const source = record(value);
  if (!source || Object.keys(source).length > 6) return null;
  const context: Record<string, string | number> = {};
  for (const [key, item] of Object.entries(source)) {
    if (!CAPABILITY_CONTEXT_KEYS.has(key)) return null;
    if (key === 'resource') {
      if (typeof item !== 'string' || item.length === 0 || item.length > 32
        || !CAPABILITY_CONTEXT_RESOURCES.has(item)) return null;
      context[key] = item;
    } else if (Number.isSafeInteger(item) && (item as number) >= 0) {
      context[key] = item as number;
    } else {
      return null;
    }
  }
  return Object.keys(context).length > 0 ? context : undefined;
}

function exactKeys(value: Record<string, unknown>, required: readonly string[], optional: readonly string[] = []): boolean {
  const allowed = new Set([...required, ...optional]);
  return required.every((key) => Object.prototype.hasOwnProperty.call(value, key))
    && Object.keys(value).every((key) => allowed.has(key));
}

function capabilityBilling(value: unknown): CapabilityBillingReceiptV1 | null {
  const billing = record(value);
  if (!billing || typeof billing.mode !== 'string' || typeof billing.status !== 'string') return null;
  if (billing.status === 'not_started') {
    if (!exactKeys(billing, ['mode', 'status'])
      || !['unknown', 'included', 'platform_metered', 'external_account'].includes(billing.mode)) return null;
    return {
      mode: billing.mode as CapabilityBillingReceiptV1['mode'],
      status: 'not_started',
    };
  }
  if (billing.mode === 'included' && billing.status === 'included') {
    return exactKeys(billing, ['mode', 'status']) ? { mode: 'included', status: 'included' } : null;
  }
  if (billing.mode === 'external_account' && billing.status === 'external') {
    return exactKeys(billing, ['mode', 'status'])
      ? { mode: 'external_account', status: 'external' }
      : null;
  }
  if (billing.mode === 'platform_metered' && billing.status === 'receipt_unavailable') {
    return exactKeys(billing, ['mode', 'status'])
      ? { mode: 'platform_metered', status: 'receipt_unavailable' }
      : null;
  }
  if (billing.mode !== 'platform_metered' || typeof billing.reserved_points !== 'string'
    || !CAPABILITY_DECIMAL_PATTERN.test(billing.reserved_points)
    || billing.reserved_points.length > 32) return null;
  if (!exactKeys(billing, ['mode', 'status', 'reserved_points'], ['actual_points', 'usage_amount', 'unit'])) return null;
  if (billing.actual_points !== undefined
    && (typeof billing.actual_points !== 'string' || billing.actual_points.length > 32
      || !CAPABILITY_DECIMAL_PATTERN.test(billing.actual_points))) return null;
  if (billing.usage_amount !== undefined
    && (typeof billing.usage_amount !== 'number' || !Number.isFinite(billing.usage_amount)
      || billing.usage_amount < 0 || billing.usage_amount > Number.MAX_SAFE_INTEGER)) return null;
  if (billing.unit !== undefined
    && (typeof billing.unit !== 'string' || billing.unit.length === 0 || billing.unit.length > 80)) return null;
  if (['settled', 'refunded'].includes(billing.status)) {
    return billing.actual_points === undefined ? null : {
      mode: 'platform_metered',
      status: billing.status as 'settled' | 'refunded',
      reserved_points: billing.reserved_points,
      actual_points: billing.actual_points,
      ...(billing.usage_amount === undefined ? {} : { usage_amount: billing.usage_amount as number }),
      ...(billing.unit === undefined ? {} : { unit: billing.unit as string }),
    };
  }
  if (!['reserved', 'dispatched', 'released', 'pending_review', 'expired'].includes(billing.status)) return null;
  return {
    mode: 'platform_metered',
    status: billing.status as 'reserved' | 'dispatched' | 'released' | 'pending_review' | 'expired',
    reserved_points: billing.reserved_points,
    ...(billing.actual_points === undefined ? {} : { actual_points: billing.actual_points as string }),
    ...(billing.usage_amount === undefined ? {} : { usage_amount: billing.usage_amount as number }),
    ...(billing.unit === undefined ? {} : { unit: billing.unit as string }),
  };
}

function capabilityDetails(value: Record<string, unknown>): CapabilityResultV1 | null {
  const required = [
    'schema', 'plugin_id', 'plugin_version', 'capability_id', 'operation', 'request_id',
    'success', 'status', 'code', 'error', 'retryable', 'billing', 'payload_schema', 'data',
  ];
  if (!exactKeys(value, required, ['retry_after_seconds', 'context'])
    || value.schema !== 'makelore-capability.v1') return null;
  if (typeof value.plugin_id !== 'string' || value.plugin_id.length > 48
    || !CAPABILITY_PLUGIN_ID_PATTERN.test(value.plugin_id)
    || value.plugin_id === 'makelore.web-search'
    || !text(value.plugin_version, 64)
    || typeof value.capability_id !== 'string' || !CAPABILITY_ID_PATTERN.test(value.capability_id)
    || typeof value.operation !== 'string' || !CAPABILITY_OPERATION_PATTERN.test(value.operation)
    || typeof value.request_id !== 'string' || value.request_id.length === 0 || value.request_id.length > 128
    || typeof value.payload_schema !== 'string' || value.payload_schema.length === 0 || value.payload_schema.length > 128) return null;
  if (typeof value.success !== 'boolean'
    || !Number.isSafeInteger(value.status)
    || (value.status as number) < 100 || (value.status as number) > 599
    || (value.code !== null && text(value.code, 128) === null)
    || (value.error !== null && text(value.error, 2_000) === null)
    || typeof value.retryable !== 'boolean'
    || !Object.prototype.hasOwnProperty.call(value, 'data')) return null;
  if (value.success) {
    if ((value.status as number) < 200 || (value.status as number) > 299
      || value.code !== null || value.error !== null || value.retryable !== false) return null;
  } else if ((value.status as number) < 400 || value.code === null || value.error === null) {
    return null;
  }
  const retryAfter = value.retry_after_seconds;
  if (retryAfter !== undefined
    && (!Number.isSafeInteger(retryAfter) || (retryAfter as number) < 0 || (retryAfter as number) > 86_400)) {
    return null;
  }
  const context = capabilityContext(value.context);
  if (context === null) return null;
  const billing = capabilityBilling(value.billing);
  if (!billing) return null;
  const data = value.data === null ? null : record(value.data);
  if (value.data !== null && !data) return null;
  if (data !== null) {
    try {
      const encoded = JSON.stringify(data);
      if (typeof encoded !== 'string' || new TextEncoder().encode(encoded).byteLength > MAX_CAPABILITY_DATA_BYTES) {
        return null;
      }
    } catch {
      return null;
    }
  }
  return {
    schema: 'makelore-capability.v1',
    plugin_id: value.plugin_id as string,
    plugin_version: value.plugin_version as string,
    capability_id: value.capability_id as string,
    operation: value.operation as string,
    request_id: value.request_id as string,
    success: value.success,
    status: value.status as number,
    code: value.code as string | null,
    error: value.error as string | null,
    retryable: value.retryable,
    ...(retryAfter === undefined ? {} : { retry_after_seconds: retryAfter as number }),
    ...(context === undefined ? {} : { context }),
    billing,
    payload_schema: value.payload_schema as string,
    data,
  };
}

const MODEL_WEB_SEARCH_ERROR_CONTRACT = Object.freeze({
  model_web_search_unsupported: { httpStatus: 400, retryable: false },
  model_context_changed: { httpStatus: 409, retryable: false },
  model_web_search_rate_limited: { httpStatus: 429, retryable: false },
  model_web_search_unavailable: { httpStatus: 503, retryable: true },
  model_web_search_invalid_result: { httpStatus: 502, retryable: false },
} satisfies Record<ModelWebSearchErrorCode, { httpStatus: number; retryable: boolean }>);

function modelToolSource(value: unknown): { title: string; url: string } | null {
  const source = record(value);
  const title = text(source?.title, 240);
  const rawUrl = text(source?.url, 2_048);
  if (!source || !exactKeys(source, ['title', 'url']) || !title || !rawUrl) return null;
  try {
    const url = new URL(rawUrl);
    if ((url.protocol !== 'http:' && url.protocol !== 'https:') || url.username || url.password) return null;
    return { title, url: url.toString() };
  } catch {
    return null;
  }
}

function modelToolDetails(value: Record<string, unknown>): ModelToolDetailsV1 | null {
  if (value.schema !== 'makelore-model-tool.v1' || value.tool !== 'web_search') return null;
  const modelId = text(value.modelId, 256);
  if (!modelId) return null;
  if (value.status === 'succeeded') {
    if (!exactKeys(value, [
      'schema', 'tool', 'status', 'modelId', 'answer', 'sources', 'sourceMode',
    ])) return null;
    const answer = text(value.answer, 20_000);
    if (!answer || !Array.isArray(value.sources) || value.sources.length > 20
      || (value.sourceMode !== 'structured' && value.sourceMode !== 'inline-or-structured')) return null;
    const sources = value.sources.map(modelToolSource);
    if (sources.some((source) => source === null)
      || (value.sourceMode === 'structured' && sources.length === 0)) return null;
    return {
      schema: 'makelore-model-tool.v1',
      tool: 'web_search',
      status: 'succeeded',
      modelId,
      answer,
      sources: sources as Array<{ title: string; url: string }>,
      sourceMode: value.sourceMode,
    };
  }
  if (value.status !== 'failed'
    || !exactKeys(value, ['schema', 'tool', 'status', 'modelId', 'error'])) return null;
  const error = record(value.error);
  const code = error?.code;
  const contract = typeof code === 'string'
    ? MODEL_WEB_SEARCH_ERROR_CONTRACT[code as ModelWebSearchErrorCode]
    : undefined;
  const message = text(error?.message, 2_000);
  if (!error || !contract || !message
    || !exactKeys(error, ['code', 'message', 'httpStatus', 'retryable'])
    || error.httpStatus !== contract.httpStatus
    || error.retryable !== contract.retryable) return null;
  return {
    schema: 'makelore-model-tool.v1',
    tool: 'web_search',
    status: 'failed',
    modelId,
    error: {
      code: code as ModelWebSearchErrorCode,
      message,
      httpStatus: contract.httpStatus as 400 | 409 | 429 | 502 | 503,
      retryable: contract.retryable,
    },
  };
}

function deviceSkillEntries(value: unknown): DevicePackageRecordV1['skillEntries'] | null {
  if (!Array.isArray(value) || value.length > 100) return null;
  const entries: Array<{ id: string; entryPath: string }> = [];
  for (const candidate of value) {
    const item = record(candidate);
    const id = text(item?.id, 128);
    const entryPath = text(item?.entryPath, 1_024);
    if (!item || !exactKeys(item, ['id', 'entryPath']) || !id || !entryPath) return null;
    entries.push({ id, entryPath });
  }
  return entries;
}

function devicePackageKind(value: unknown): DevicePackageRecordV1['kind'] | null {
  return value === 'skill-only' || value === 'pi-extension' || value === 'mixed' ? value : null;
}

function devicePackagePreview(value: unknown): InstallPreviewV1 | null {
  const preview = record(value);
  if (!preview || !exactKeys(preview, [
    'schemaVersion', 'planId', 'expiresAt', 'requestedSource', 'resolvedSource',
    'packageId', 'displayName', 'resolvedVersion', 'kind', 'skillEntries',
    'extensionEntries', 'includesExecutableCode', 'ignoredLifecycleScripts', 'warnings',
    'scope',
  ]) || preview.schemaVersion !== 1 || preview.scope !== 'device-parent-workers'
    || typeof preview.includesExecutableCode !== 'boolean') return null;
  const planId = text(preview.planId, 128);
  const expiresAt = text(preview.expiresAt, 64);
  const requestedSource = text(preview.requestedSource, 2_048);
  const resolvedSource = text(preview.resolvedSource, 4_096);
  const packageId = text(preview.packageId, 128);
  const displayName = text(preview.displayName, 240);
  const resolvedVersion = text(preview.resolvedVersion, 128);
  const kind = devicePackageKind(preview.kind);
  const skillEntries = deviceSkillEntries(preview.skillEntries);
  const extensionEntries = strings(preview.extensionEntries, 100);
  const ignoredLifecycleScripts = strings(preview.ignoredLifecycleScripts, 20);
  const warnings = strings(preview.warnings, 20);
  if (!planId || !expiresAt || !requestedSource || !resolvedSource || !packageId
    || !displayName || !resolvedVersion || !kind || !skillEntries || !extensionEntries
    || !ignoredLifecycleScripts || !warnings) return null;
  return {
    schemaVersion: 1, planId, expiresAt, requestedSource, resolvedSource, packageId,
    displayName, resolvedVersion, kind, skillEntries, extensionEntries,
    includesExecutableCode: preview.includesExecutableCode,
    ignoredLifecycleScripts, warnings, scope: 'device-parent-workers',
  };
}

function devicePackageRecord(value: unknown): DevicePackageRecordV1 | null {
  const item = record(value);
  if (!item || !exactKeys(item, [
    'schemaVersion', 'packageId', 'displayName', 'resolvedVersion', 'source', 'kind',
    'skillEntries', 'extensionEntries', 'enabled', 'confirmedExecutableCode', 'installedAt',
  ]) || item.schemaVersion !== 1 || typeof item.enabled !== 'boolean'
    || typeof item.confirmedExecutableCode !== 'boolean') return null;
  const source = record(item.source);
  const packageId = text(item.packageId, 128);
  const displayName = text(item.displayName, 240);
  const resolvedVersion = text(item.resolvedVersion, 128);
  const kind = devicePackageKind(item.kind);
  const installedAt = text(item.installedAt, 64);
  const skillEntries = deviceSkillEntries(item.skillEntries);
  const extensionEntries = strings(item.extensionEntries, 100);
  if (!source || !exactKeys(source, ['kind', 'requested', 'resolved'])
    || !['npm', 'git', 'file'].includes(String(source.kind))
    || !packageId || !displayName || !resolvedVersion || !kind || !installedAt
    || !skillEntries || !extensionEntries) return null;
  const requested = text(source.requested, 2_048);
  const resolved = text(source.resolved, 4_096);
  if (!requested || !resolved) return null;
  return {
    schemaVersion: 1, packageId, displayName, resolvedVersion,
    source: { kind: source.kind as DevicePackageRecordV1['source']['kind'], requested, resolved },
    kind, skillEntries, extensionEntries, enabled: item.enabled,
    confirmedExecutableCode: item.confirmedExecutableCode, installedAt,
  };
}

function devicePackageIndex(value: unknown): DevicePackageIndexV1 | null {
  const index = record(value);
  if (!index || !exactKeys(index, ['schemaVersion', 'generation', 'packages'])
    || index.schemaVersion !== 1 || !Number.isSafeInteger(index.generation)
    || (index.generation as number) < 0 || !Array.isArray(index.packages)
    || index.packages.length > 200) return null;
  const packages = index.packages.map(devicePackageRecord);
  if (packages.some((item) => item === null)) return null;
  return { schemaVersion: 1, generation: index.generation as number, packages: packages as DevicePackageRecordV1[] };
}

function devicePackageDetails(value: Record<string, unknown>): DevicePackageToolDetailsV1 | null {
  if (value.schema !== 'makelore-device-package.v1' || value.success !== true
    || !['prepare', 'commit', 'list', 'set_enabled', 'uninstall'].includes(String(value.operation))) return null;
  if (value.operation === 'prepare') {
    if (!exactKeys(value, ['schema', 'operation', 'success', 'preview'])) return null;
    const preview = devicePackagePreview(value.preview);
    return preview ? { schema: 'makelore-device-package.v1', operation: 'prepare', success: true, preview } : null;
  }
  if (!exactKeys(value, ['schema', 'operation', 'success', 'index'])) return null;
  const index = devicePackageIndex(value.index);
  return index ? {
    schema: 'makelore-device-package.v1',
    operation: value.operation as Exclude<DevicePackageToolDetailsV1['operation'], 'prepare'>,
    success: true,
    index,
  } : null;
}

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);
  if (details.schema === 'makelore-capability.v1') return capabilityDetails(details);
  if (details.schema === 'makelore-model-tool.v1') return modelToolDetails(details);
  if (details.schema === 'makelore-device-package.v1') return devicePackageDetails(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);
}