/**
 * Chart Suggestion Service
 * Frontend service for calling the AI chart suggestions API
 */

export interface ChartSuggestion {
  type: 'bar' | 'horizontal-bar' | 'line' | 'area' | 'pie' | 'radar' | 'funnel' | 'gauge'
  title: string
  data: { label: string; value: number }[]
  description: string
  rationale?: string
}

export interface SuggestChartsResponse {
  suggestions: ChartSuggestion[]
  analyzedText: string
  detectedData: string
  hasData: boolean
  error?: string
  quotaExceeded?: boolean
}

export interface SuggestChartsRequest {
  content: string
  selection?: string | null
  noteId?: string
}

/**
 * Call the AI chart suggestions API
 * @param request - The request parameters
 * @returns Promise with the chart suggestions
 */
export async function suggestCharts(request: SuggestChartsRequest): Promise<SuggestChartsResponse> {
  try {
    const response = await fetch('/api/ai/suggest-charts', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
      },
      body: JSON.stringify(request),
    })

    if (!response.ok) {
      const errorData = await response.json().catch(() => ({ error: 'Unknown error' }))
      const isQuotaError = response.status === 402 || errorData.error === 'QUOTA_EXCEEDED'
      return {
        suggestions: [],
        analyzedText: '',
        detectedData: '',
        hasData: false,
        error: isQuotaError
          ? 'AI quota exceeded. Please upgrade your plan to continue using AI features.'
          : (errorData.error || `HTTP ${response.status}`),
        quotaExceeded: isQuotaError,
      }
    }

    const data = await response.json()
    return data as SuggestChartsResponse
  } catch (error) {
    console.error('[suggestCharts] Network error:', error)
    return {
      suggestions: [],
      analyzedText: '',
      detectedData: '',
      hasData: false,
      error: error instanceof Error ? error.message : 'Network error',
    }
  }
}

/**
 * Convert a chart suggestion to raw chart format (no markdown ticks)
 * This is the content that goes inside <code class="language-chart">
 * @param suggestion - The chart suggestion to convert
 * @returns Raw chart content string
 */
export function chartSuggestionToMarkdown(suggestion: ChartSuggestion): string {
  const lines = [
    suggestion.type,
    suggestion.title,
    ...suggestion.data.map(d => `${d.label}: ${d.value}`),
  ]
  return lines.join('\n')
}