const API_BASE = '/api'

class ApiService {
  constructor() {
    this.token = null
  }

  setToken(token) {
    this.token = token
  }

  async request(endpoint, options = {}) {
    const headers = {
      'Content-Type': 'application/json',
      ...options.headers,
    }

    if (this.token) {
      headers['Authorization'] = `Bearer ${this.token}`
    }

    const response = await fetch(`${API_BASE}${endpoint}`, {
      ...options,
      headers,
    })

    if (!response.ok) {
      const error = await response.json().catch(() => ({ detail: 'Request failed' }))
      throw new Error(error.detail || 'Request failed')
    }

    return response.json()
  }

  // Grid endpoints
  async getGrid(system = 'case33bw') {
    return this.request(`/grid?system=${system}`)
  }

  async getBaseline(system = 'case33bw') {
    return this.request(`/baseline/${system}`)
  }

  // Optimization
  async optimize(data) {
    return this.request('/optimize', {
      method: 'POST',
      body: JSON.stringify(data),
    })
  }

  // Simulation
  async simulate(data) {
    return this.request('/simulate', {
      method: 'POST',
      body: JSON.stringify(data),
    })
  }

  async toggleSwitch(data) {
    return this.request('/simulate/toggle', {
      method: 'POST',
      body: JSON.stringify(data),
    })
  }

  // Grid - Set Out of Service Lines
  async setOutOfServiceLines(data) {
    return this.request('/grid/set-out-of-service', {
      method: 'POST',
      body: JSON.stringify(data),
    })
  }

  // Digital Twin
  async digitalTwin(data) {
    return this.request('/digital-twin', {
      method: 'POST',
      body: JSON.stringify(data),
    })
  }

  async getScenarios(system = 'case33bw') {
    return this.request(`/digital-twin/scenarios?system=${system}`)
  }

  // Usage & Stats
  async getUsage(limit = 100) {
    return this.request(`/usage?limit=${limit}`)
  }

  async getUsageStats() {
    return this.request('/usage/stats')
  }

  async getUsageSummary() {
    return this.request('/usage/summary')
  }

  // Audit
  async getAuditLogs(limit = 100) {
    return this.request(`/audit?limit=${limit}`)
  }

  async getAuditSummary() {
    return this.request('/audit/summary')
  }

  // ROI
  async calculateROI(data) {
    return this.request('/roi', {
      method: 'POST',
      body: JSON.stringify(data),
    })
  }

  async getPricing() {
    return this.request('/roi/pricing')
  }

  async compareROI(numberOfFeeders) {
    return this.request(`/roi/comparison?number_of_feeders=${numberOfFeeders}`)
  }

  // Reports
  async getReportData(system = 'case33bw', method = 'hybrid') {
    return this.request(`/report/data?system=${system}&method=${method}`)
  }

  async generateReport(data) {
    const headers = {
      'Content-Type': 'application/json',
    }
    if (this.token) {
      headers['Authorization'] = `Bearer ${this.token}`
    }

    const response = await fetch(`${API_BASE}/report`, {
      method: 'POST',
      headers,
      body: JSON.stringify(data),
    })

    return response.text()
  }
}

export const api = new ApiService()
export default api