'use client';

import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
import { toast } from 'sonner';
import type { ProcessInfo, SystemInfo, LogTailResult } from '@/lib/supervisor/types';

// Query Keys
export const supervisorKeys = {
  all: ['supervisor'] as const,
  system: () => [...supervisorKeys.all, 'system'] as const,
  processes: () => [...supervisorKeys.all, 'processes'] as const,
  process: (name: string) => [...supervisorKeys.processes(), name] as const,
  logs: (name: string, type: 'stdout' | 'stderr') =>
    [...supervisorKeys.process(name), 'logs', type] as const,
};

// API Client Functions
async function fetchSystemInfo(): Promise<SystemInfo> {
  const response = await fetch('/api/supervisor/system');
  if (!response.ok) {
    const error = await response.json();
    throw new Error(error.error || 'Failed to fetch system info');
  }
  return response.json();
}

async function fetchProcesses(): Promise<ProcessInfo[]> {
  const response = await fetch('/api/supervisor/processes');
  if (!response.ok) {
    const error = await response.json();
    throw new Error(error.error || 'Failed to fetch processes');
  }
  return response.json();
}

async function fetchProcessInfo(name: string): Promise<ProcessInfo> {
  const response = await fetch(`/api/supervisor/processes/${encodeURIComponent(name)}`);
  if (!response.ok) {
    const error = await response.json();
    throw new Error(error.error || 'Failed to fetch process info');
  }
  return response.json();
}

async function fetchProcessLogs(
  name: string,
  type: 'stdout' | 'stderr',
  offset: number = -4096,
  length: number = 4096
): Promise<LogTailResult> {
  const response = await fetch(
    `/api/supervisor/processes/${encodeURIComponent(name)}/logs/${type}?offset=${offset}&length=${length}`
  );
  if (!response.ok) {
    const error = await response.json();
    throw new Error(error.error || `Failed to fetch ${type} logs`);
  }
  return response.json();
}

async function startProcess(name: string, wait: boolean = true): Promise<{ success: boolean; message: string }> {
  const response = await fetch(`/api/supervisor/processes/${encodeURIComponent(name)}/start`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ wait }),
  });
  if (!response.ok) {
    const error = await response.json();
    throw new Error(error.error || 'Failed to start process');
  }
  return response.json();
}

async function stopProcess(name: string, wait: boolean = true): Promise<{ success: boolean; message: string }> {
  const response = await fetch(`/api/supervisor/processes/${encodeURIComponent(name)}/stop`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ wait }),
  });
  if (!response.ok) {
    const error = await response.json();
    throw new Error(error.error || 'Failed to stop process');
  }
  return response.json();
}

async function restartProcess(name: string): Promise<{ success: boolean; message: string }> {
  const response = await fetch(`/api/supervisor/processes/${encodeURIComponent(name)}/restart`, {
    method: 'POST',
  });
  if (!response.ok) {
    const error = await response.json();
    throw new Error(error.error || 'Failed to restart process');
  }
  return response.json();
}

// Custom Hooks

export function useSystemInfo() {
  return useQuery({
    queryKey: supervisorKeys.system(),
    queryFn: fetchSystemInfo,
    refetchInterval: 5000, // Refetch every 5 seconds
  });
}

export function useProcesses(options?: { refetchInterval?: number }) {
  return useQuery({
    queryKey: supervisorKeys.processes(),
    queryFn: fetchProcesses,
    refetchInterval: options?.refetchInterval ?? 3000, // Default 3 seconds
  });
}

export function useProcessInfo(name: string, enabled: boolean = true) {
  return useQuery({
    queryKey: supervisorKeys.process(name),
    queryFn: () => fetchProcessInfo(name),
    enabled,
    refetchInterval: 3000,
  });
}

export function useProcessLogs(
  name: string,
  type: 'stdout' | 'stderr',
  options?: {
    offset?: number;
    length?: number;
    enabled?: boolean;
    refetchInterval?: number;
  }
) {
  return useQuery({
    queryKey: [...supervisorKeys.logs(name, type), options?.offset, options?.length],
    queryFn: () => fetchProcessLogs(name, type, options?.offset, options?.length),
    enabled: options?.enabled ?? true,
    refetchInterval: options?.refetchInterval ?? 2000,
  });
}

export function useStartProcess() {
  const queryClient = useQueryClient();

  return useMutation({
    mutationFn: ({ name, wait }: { name: string; wait?: boolean }) => startProcess(name, wait),
    onSuccess: (data, variables) => {
      toast.success(data.message);
      // Invalidate and refetch
      queryClient.invalidateQueries({ queryKey: supervisorKeys.processes() });
      queryClient.invalidateQueries({ queryKey: supervisorKeys.process(variables.name) });
    },
    onError: (error: Error) => {
      toast.error(`Failed to start process: ${error.message}`);
    },
  });
}

export function useStopProcess() {
  const queryClient = useQueryClient();

  return useMutation({
    mutationFn: ({ name, wait }: { name: string; wait?: boolean }) => stopProcess(name, wait),
    onSuccess: (data, variables) => {
      toast.success(data.message);
      queryClient.invalidateQueries({ queryKey: supervisorKeys.processes() });
      queryClient.invalidateQueries({ queryKey: supervisorKeys.process(variables.name) });
    },
    onError: (error: Error) => {
      toast.error(`Failed to stop process: ${error.message}`);
    },
  });
}

export function useRestartProcess() {
  const queryClient = useQueryClient();

  return useMutation({
    mutationFn: (name: string) => restartProcess(name),
    onSuccess: (data, name) => {
      toast.success(data.message);
      queryClient.invalidateQueries({ queryKey: supervisorKeys.processes() });
      queryClient.invalidateQueries({ queryKey: supervisorKeys.process(name) });
    },
    onError: (error: Error) => {
      toast.error(`Failed to restart process: ${error.message}`);
    },
  });
}