const BASE = '/energy/api'

async function request<T>(path: string, options?: RequestInit): Promise<T> {
  const res = await fetch(`${BASE}${path}`, {
    credentials: 'include',
    headers: { 'Content-Type': 'application/json' },
    ...options,
  })

  if (res.status === 401) {
    if (window.location.pathname !== '/energy/login') {
      window.location.href = '/energy/login'
    }
    throw new Error('Unauthorized')
  }

  if (!res.ok) {
    const body = await res.json().catch(() => ({ error: res.statusText }))
    throw new Error(body.error || res.statusText)
  }

  return res.json()
}

export interface EnergyBar {
  time: string
  buy: number
  sell: number
  produce: number
  consume: number
  charge: number
}

export interface PowerPoint {
  time: string
  pv: number
  house: number
  barn: number
  charger: number
}

export interface BatteryPoint {
  time: string
  level: number
}

export const api = {
  login(username: string, password: string) {
    return request<{ status: string }>('/login', {
      method: 'POST',
      body: JSON.stringify({ username, password }),
    })
  },

  logout() {
    return request<{ status: string }>('/logout', { method: 'POST' })
  },

  checkAuth() {
    return request<{ status: string }>('/auth/check')
  },

  getBars(period: 'day' | 'week' | 'month', count: number) {
    return request<{ bars: EnergyBar[] }>(`/bars?period=${period}&count=${count}`)
  },

  getPower(range: string) {
    return request<{ points: PowerPoint[] }>(`/power?range=${range}`)
  },

  getBattery(range: string) {
    return request<{ points: BatteryPoint[] }>(`/battery?range=${range}`)
  },
}