import type { GatewayToolResultContentBlock } from '@electron/providers/BaseProvider';
import type {
  AttachedFileMeta,
  RawMessage,
  ToolArtifact,
  ToolErrorInfo,
  ToolLifecycleStatus,
  ToolRenderHints,
  ToolResultPayload,
} from '@runtime/shared/chat-model';

type MaybePromise<T> = T | Promise<T>;

export type ToolRuntimePreflightStatus = 'ready' | 'blocked';
export type ToolRuntimeTerminalStatus = Exclude<ToolLifecycleStatus, 'running'>;
export type ToolRuntimeSource = 'planner' | 'provider' | 'manual';
export type ToolRuntimePhase = 'preflight' | 'execute' | 'normalize';

export interface ToolRuntimeLifecycleEvent {
  phase: ToolRuntimePhase;
  toolCallId: string;
  toolName: string;
  summary?: string;
  ok?: boolean;
  error?: ToolErrorInfo;
  metadata?: Record<string, unknown>;
}

export interface ToolRuntimeContext {
  sessionKey?: string;
  runId?: string;
  signal?: AbortSignal;
  workingDirectory?: string;
  files?: AttachedFileMeta[];
  metadata?: Record<string, unknown>;
  emitStatus?: (event: ToolRuntimeLifecycleEvent) => void;
}

export interface ToolRuntimeInvocation {
  toolCallId: string;
  toolName: string;
  input?: unknown;
  summary?: string;
  source?: ToolRuntimeSource;
  metadata?: Record<string, unknown>;
}

export interface ToolRuntimePreflightResult {
  ok: boolean;
  status: ToolRuntimePreflightStatus;
  toolCallId: string;
  toolName: string;
  summary?: string;
  normalizedInput?: unknown;
  warnings?: string[];
  missing?: string[];
  error?: ToolErrorInfo;
  metadata?: Record<string, unknown>;
}

export interface ToolRuntimeExecutionResult {
  ok: boolean;
  status: ToolRuntimeTerminalStatus;
  toolCallId: string;
  toolName: string;
  normalizedInput?: unknown;
  summary?: string;
  raw?: unknown;
  files?: AttachedFileMeta[];
  artifacts?: ToolArtifact[];
  logs?: Array<string | Record<string, unknown>>;
  error?: ToolErrorInfo;
  retryable?: boolean;
  skillType?: string;
  renderHints?: ToolRenderHints;
  metadata?: Record<string, unknown>;
  durationMs: number;
}

export interface ToolRuntimeNormalizedResult {
  ok: boolean;
  status: ToolRuntimeTerminalStatus;
  toolCallId: string;
  toolName: string;
  summary?: string;
  payload: ToolResultPayload;
  block: GatewayToolResultContentBlock;
  transcriptMessage: RawMessage;
}

export interface ToolRuntimeRunResult {
  preflight: ToolRuntimePreflightResult;
  execution: ToolRuntimeExecutionResult;
  normalized: ToolRuntimeNormalizedResult;
}

export interface ToolRuntimeAdapter {
  readonly toolName: string;
  matchesTool?(toolName: string): boolean;
  preflight(
    invocation: ToolRuntimeInvocation,
    context: ToolRuntimeContext
  ): MaybePromise<ToolRuntimePreflightResult>;
  execute(
    invocation: ToolRuntimeInvocation,
    context: ToolRuntimeContext
  ): MaybePromise<ToolRuntimeExecutionResult>;
  normalize?(
    execution: ToolRuntimeExecutionResult,
    context: ToolRuntimeContext
  ): MaybePromise<ToolRuntimeNormalizedResult>;
}

function normalizeToolError(error: unknown, fallbackCode = 'tool_runtime_error'): ToolErrorInfo {
  if (typeof error === 'string') {
    return { code: fallbackCode, message: error };
  }

  if (error instanceof Error) {
    return {
      code: fallbackCode,
      message: error.message,
      details: error,
    };
  }

  return {
    code: fallbackCode,
    message: 'Unknown tool runtime error',
    details: error,
  };
}

function buildFallbackSummary(execution: ToolRuntimeExecutionResult): string {
  if (execution.summary?.trim()) {
    return execution.summary;
  }

  if (execution.error?.message?.trim()) {
    return execution.error.message;
  }

  return execution.ok
    ? `Tool ${execution.toolName} completed`
    : `Tool ${execution.toolName} failed`;
}

function buildToolResultText(payload: ToolResultPayload, execution: ToolRuntimeExecutionResult): string {
  if (payload.summary?.trim()) {
    return payload.summary;
  }

  if (typeof payload.error === 'string' && payload.error.trim()) {
    return payload.error;
  }

  if (
    payload.error &&
    typeof payload.error === 'object' &&
    'message' in payload.error &&
    typeof payload.error.message === 'string' &&
    payload.error.message.trim()
  ) {
    return payload.error.message;
  }

  if (typeof payload.raw === 'string' && payload.raw.trim()) {
    return payload.raw;
  }

  if (payload.logs?.length) {
    const firstLog = payload.logs[0];
    return typeof firstLog === 'string' ? firstLog : JSON.stringify(firstLog);
  }

  return buildFallbackSummary(execution);
}

export function buildToolResultPayload(
  execution: ToolRuntimeExecutionResult
): ToolResultPayload {
  const summary = buildFallbackSummary(execution);

  return {
    ok: execution.ok,
    summary,
    structuredData: execution.raw,
    files: execution.files,
    artifacts: execution.artifacts,
    logs: execution.logs,
    error: execution.error,
    retryable: execution.retryable,
    skillType: execution.skillType,
    renderHints: execution.renderHints,
    raw: execution.raw,
  };
}

export function normalizeToolExecutionResult(
  execution: ToolRuntimeExecutionResult
): ToolRuntimeNormalizedResult {
  const payload = buildToolResultPayload(execution);
  const summary = payload.summary ?? buildFallbackSummary(execution);
  const block: GatewayToolResultContentBlock = {
    type: 'tool_result',
    toolCallId: execution.toolCallId,
    content: buildToolResultText(payload, execution),
    result: payload,
    summary,
    ok: payload.ok,
    error: payload.error,
  };

  return {
    ok: execution.ok,
    status: execution.status,
    toolCallId: execution.toolCallId,
    toolName: execution.toolName,
    summary,
    payload,
    block,
    transcriptMessage: {
      role: 'tool_result',
      content: [block],
      timestamp: Date.now(),
      toolCallId: execution.toolCallId,
      toolName: execution.toolName,
      toolCall: {
        id: execution.toolCallId,
        name: execution.toolName,
        input: execution.normalizedInput,
        summary,
      },
      toolResult: payload,
      details: execution.raw,
      isError: !execution.ok,
    },
  };
}

export function createUnsupportedToolPreflightResult(
  invocation: ToolRuntimeInvocation
): ToolRuntimePreflightResult {
  return {
    ok: false,
    status: 'blocked',
    toolCallId: invocation.toolCallId,
    toolName: invocation.toolName,
    summary: `No adapter registered for ${invocation.toolName}`,
    error: {
      code: 'tool_adapter_not_found',
      message: `No adapter registered for ${invocation.toolName}`,
    },
  };
}

export function createBlockedToolExecutionResult(
  preflight: ToolRuntimePreflightResult
): ToolRuntimeExecutionResult {
  return {
    ok: false,
    status: 'error',
    toolCallId: preflight.toolCallId,
    toolName: preflight.toolName,
    normalizedInput: preflight.normalizedInput,
    summary: preflight.summary,
    error: preflight.error ?? {
      code: 'tool_preflight_blocked',
      message: preflight.summary || `Tool ${preflight.toolName} was blocked in preflight`,
    },
    metadata: preflight.metadata,
    durationMs: 0,
  };
}

function toolMatches(adapter: ToolRuntimeAdapter, toolName: string): boolean {
  return adapter.toolName === toolName || adapter.matchesTool?.(toolName) === true;
}

function emitStatus(
  context: ToolRuntimeContext,
  event: ToolRuntimeLifecycleEvent
): void {
  context.emitStatus?.(event);
}

export class ToolRuntime {
  private readonly adapters: ToolRuntimeAdapter[];

  constructor(adapters: ToolRuntimeAdapter[] = []) {
    this.adapters = [...adapters];
  }

  register(adapter: ToolRuntimeAdapter): void {
    this.adapters.push(adapter);
  }

  listAdapters(): ToolRuntimeAdapter[] {
    return [...this.adapters];
  }

  resolveAdapter(toolName: string): ToolRuntimeAdapter | null {
    return this.adapters.find((adapter) => toolMatches(adapter, toolName)) ?? null;
  }

  async preflight(
    invocation: ToolRuntimeInvocation,
    context: ToolRuntimeContext = {}
  ): Promise<ToolRuntimePreflightResult> {
    const adapter = this.resolveAdapter(invocation.toolName);
    if (!adapter) {
      const blocked = createUnsupportedToolPreflightResult(invocation);
      emitStatus(context, {
        phase: 'preflight',
        toolCallId: blocked.toolCallId,
        toolName: blocked.toolName,
        summary: blocked.summary,
        ok: blocked.ok,
        error: blocked.error,
      });
      return blocked;
    }

    try {
      const preflight = await adapter.preflight(invocation, context);
      emitStatus(context, {
        phase: 'preflight',
        toolCallId: preflight.toolCallId,
        toolName: preflight.toolName,
        summary: preflight.summary,
        ok: preflight.ok,
        error: preflight.error,
        metadata: preflight.metadata,
      });
      return preflight;
    } catch (error) {
      const normalizedError = normalizeToolError(error, 'tool_preflight_failed');
      const blocked: ToolRuntimePreflightResult = {
        ok: false,
        status: 'blocked',
        toolCallId: invocation.toolCallId,
        toolName: invocation.toolName,
        summary: normalizedError.message,
        error: normalizedError,
      };
      emitStatus(context, {
        phase: 'preflight',
        toolCallId: blocked.toolCallId,
        toolName: blocked.toolName,
        summary: blocked.summary,
        ok: blocked.ok,
        error: blocked.error,
      });
      return blocked;
    }
  }

  async execute(
    invocation: ToolRuntimeInvocation,
    context: ToolRuntimeContext = {},
    preflight?: ToolRuntimePreflightResult
  ): Promise<ToolRuntimeExecutionResult> {
    const resolvedPreflight = preflight ?? await this.preflight(invocation, context);
    if (!resolvedPreflight.ok || resolvedPreflight.status === 'blocked') {
      const blocked = createBlockedToolExecutionResult(resolvedPreflight);
      emitStatus(context, {
        phase: 'execute',
        toolCallId: blocked.toolCallId,
        toolName: blocked.toolName,
        summary: blocked.summary,
        ok: blocked.ok,
        error: blocked.error,
        metadata: blocked.metadata,
      });
      return blocked;
    }

    const adapter = this.resolveAdapter(invocation.toolName);
    if (!adapter) {
      const blocked = createBlockedToolExecutionResult(
        createUnsupportedToolPreflightResult(invocation)
      );
      emitStatus(context, {
        phase: 'execute',
        toolCallId: blocked.toolCallId,
        toolName: blocked.toolName,
        summary: blocked.summary,
        ok: blocked.ok,
        error: blocked.error,
      });
      return blocked;
    }

    const preparedInvocation: ToolRuntimeInvocation = {
      ...invocation,
      input: resolvedPreflight.normalizedInput ?? invocation.input,
    };

    const startTime = Date.now();
    try {
      const execution = await adapter.execute(preparedInvocation, context);
      const completed: ToolRuntimeExecutionResult = {
        ...execution,
        toolCallId: execution.toolCallId || preparedInvocation.toolCallId,
        toolName: execution.toolName || preparedInvocation.toolName,
        normalizedInput: execution.normalizedInput ?? preparedInvocation.input,
        durationMs: execution.durationMs ?? Date.now() - startTime,
      };
      emitStatus(context, {
        phase: 'execute',
        toolCallId: completed.toolCallId,
        toolName: completed.toolName,
        summary: completed.summary,
        ok: completed.ok,
        error: completed.error,
        metadata: completed.metadata,
      });
      return completed;
    } catch (error) {
      const normalizedError = normalizeToolError(error, 'tool_execute_failed');
      const failed: ToolRuntimeExecutionResult = {
        ok: false,
        status: 'error',
        toolCallId: preparedInvocation.toolCallId,
        toolName: preparedInvocation.toolName,
        normalizedInput: preparedInvocation.input,
        summary: normalizedError.message,
        error: normalizedError,
        durationMs: Date.now() - startTime,
      };
      emitStatus(context, {
        phase: 'execute',
        toolCallId: failed.toolCallId,
        toolName: failed.toolName,
        summary: failed.summary,
        ok: failed.ok,
        error: failed.error,
      });
      return failed;
    }
  }

  async normalize(
    execution: ToolRuntimeExecutionResult,
    context: ToolRuntimeContext = {}
  ): Promise<ToolRuntimeNormalizedResult> {
    const adapter = this.resolveAdapter(execution.toolName);
    const normalized = adapter?.normalize
      ? await adapter.normalize(execution, context)
      : normalizeToolExecutionResult(execution);

    emitStatus(context, {
      phase: 'normalize',
      toolCallId: normalized.toolCallId,
      toolName: normalized.toolName,
      summary: normalized.summary,
      ok: normalized.ok,
      error: typeof normalized.payload.error === 'string'
        ? { message: normalized.payload.error }
        : normalized.payload.error,
    });

    return normalized;
  }

  async run(
    invocation: ToolRuntimeInvocation,
    context: ToolRuntimeContext = {}
  ): Promise<ToolRuntimeRunResult> {
    const preflight = await this.preflight(invocation, context);
    const execution = await this.execute(invocation, context, preflight);
    const normalized = await this.normalize(execution, context);
    return {
      preflight,
      execution,
      normalized,
    };
  }
}

export function createToolRuntime(adapters: ToolRuntimeAdapter[] = []): ToolRuntime {
  return new ToolRuntime(adapters);
}