import { apiClient } from './apiClient';

export interface QuestionBank {
  id: string;
  name: string;
  description?: string;
  status: 'DRAFT' | 'PENDING_REVIEW' | 'PUBLISHED' | 'REJECTED';
  templateId?: string | null;
  createdAt: string;
  updatedAt: string;
}

export interface QuestionBankItem {
  id: string;
  bankId: string;
  questionText: string;
  questionType: 'SHORT_ANSWER' | 'MULTIPLE_CHOICE' | 'TRUE_FALSE';
  options?: string[] | null;
  correctAnswer?: string | null;
  judgment?: string | null;
  followupHints?: string[] | null;
  keyPoints: string[];
  difficulty: 'STANDARD' | 'ADVANCED' | 'SPECIALIST';
  dimension: 'PROMPT' | 'LLM' | 'IDE' | 'DEV_PATTERN' | 'WORK_CAPABILITY';
  basis?: string | null;
  status: 'PENDING_REVIEW' | 'PUBLISHED';
  createdAt: string;
}

export interface CreateQuestionBankDto {
  name: string;
  description?: string;
  templateId?: string;
}

export interface CreateQuestionBankItemDto {
  questionText: string;
  questionType: 'SHORT_ANSWER' | 'MULTIPLE_CHOICE' | 'TRUE_FALSE';
  options?: string[];
  correctAnswer?: string;
  keyPoints: string[];
  difficulty: 'STANDARD' | 'ADVANCED' | 'SPECIALIST';
  dimension: 'PROMPT' | 'LLM' | 'IDE' | 'DEV_PATTERN' | 'WORK_CAPABILITY';
}

export const questionBankService = {
  async getBanks(): Promise<QuestionBank[]> {
    const response = await apiClient.request('/question-banks', {});
    if (!response.ok) throw new Error('Failed to fetch question banks');
    const data = await response.json();
    return Array.isArray(data) ? data : data.data || [];
  },

  async getBank(id: string): Promise<QuestionBank> {
    const response = await apiClient.request(`/question-banks/${id}`, {});
    if (!response.ok) throw new Error('Failed to fetch question bank');
    return await response.json();
  },

  async createBank(data: CreateQuestionBankDto): Promise<QuestionBank> {
    const response = await apiClient.post<QuestionBank>('/question-banks', data);
    if (response.status >= 400) throw new Error('Failed to create question bank');
    return response.data;
  },

  async updateBank(id: string, data: Partial<CreateQuestionBankDto>): Promise<QuestionBank> {
    const response = await apiClient.request(`/question-banks/${id}`, {
      method: 'PUT',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(data),
    });
    if (!response.ok) throw new Error('Failed to update question bank');
    return await response.json();
  },

  async deleteBank(id: string): Promise<void> {
    const response = await apiClient.request(`/question-banks/${id}`, { method: 'DELETE' });
    if (!response.ok) throw new Error('Failed to delete question bank');
  },

  async submitForReview(id: string): Promise<QuestionBank> {
    const response = await apiClient.request(`/question-banks/${id}/submit`, { method: 'PUT' });
    if (!response.ok) throw new Error('Failed to submit for review');
    return await response.json();
  },

  async approveBank(id: string): Promise<QuestionBank> {
    const response = await apiClient.request(`/question-banks/${id}/review`, { 
      method: 'PUT',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ approved: true }),
    });
    if (!response.ok) throw new Error('Failed to approve');
    return await response.json();
  },

  async rejectBank(id: string): Promise<QuestionBank> {
    const response = await apiClient.request(`/question-banks/${id}/review`, { 
      method: 'PUT',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ approved: false }),
    });
    if (!response.ok) throw new Error('Failed to reject');
    return await response.json();
  },

  async publishBank(id: string): Promise<QuestionBank> {
    const response = await apiClient.request(`/question-banks/${id}/publish`, { method: 'PUT' });
    if (!response.ok) throw new Error('Failed to publish');
    return await response.json();
  },

  async getBankItems(bankId: string): Promise<QuestionBankItem[]> {
    const response = await apiClient.request(`/question-banks/${bankId}`, {});
    if (!response.ok) throw new Error('Failed to fetch items');
    const data = await response.json();
    return data.items || [];
  },

  async createItem(bankId: string, data: CreateQuestionBankItemDto): Promise<QuestionBankItem> {
    const response = await apiClient.request(`/question-banks/${bankId}/items`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(data),
    });
    if (!response.ok) throw new Error('Failed to create item');
    return await response.json();
  },

  async updateItem(bankId: string, itemId: string, data: Partial<CreateQuestionBankItemDto>): Promise<QuestionBankItem> {
    const response = await apiClient.request(`/question-banks/${bankId}/items/${itemId}`, {
      method: 'PUT',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(data),
    });
    if (!response.ok) throw new Error('Failed to update item');
    return await response.json();
  },

  async deleteItem(bankId: string, itemId: string): Promise<void> {
    const response = await apiClient.request(`/question-banks/${bankId}/items/${itemId}`, { method: 'DELETE' });
    if (!response.ok) throw new Error('Failed to delete item');
  },

  async generateQuestions(bankId: string, count: number, knowledgeBaseContent: string): Promise<QuestionBankItem[]> {
    const response = await apiClient.request(`/question-banks/${bankId}/generate`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ count, knowledgeBaseContent }),
    });
    if (!response.ok) {
      const errBody = await response.text().catch(() => '');
      let msg = 'Failed to generate questions';
      try { const parsed = JSON.parse(errBody); if (parsed.message) msg = parsed.message; } catch {}
      throw new Error(msg);
    }
    return await response.json();
  },

  async batchReviewItems(bankId: string, itemIds: string[], approved: boolean, comment?: string): Promise<QuestionBankItem[]> {
    const response = await apiClient.request(`/question-banks/${bankId}/items/batch-review`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ itemIds, approved, comment }),
    });
    if (!response.ok) throw new Error('Failed to batch review items');
    return await response.json();
  },
};