import type {
  PaginatedResponse,
  Credential,
  Environment,
  ScenarioCredential,
  Session,
  Scenario,
  ScenarioRun,
  ScenarioRunDetail,
  ScenarioRunStep,
  ScenarioStep,
  Snippet,
} from './types';

// In dev, Vite proxies /environments /sessions /scenarios to localhost:3000.
// In production (or when VITE_API_URL is set) we hit the configured origin directly.
const BASE_URL: string = (import.meta.env.VITE_API_URL as string | undefined) ?? '';

async function request<T>(path: string, init?: RequestInit): Promise<T> {
  const res = await fetch(`${BASE_URL}${path}`, {
    headers: { 'Content-Type': 'application/json', ...init?.headers },
    ...init,
  });
  if (!res.ok) {
    const text = await res.text().catch(() => res.statusText);
    throw new Error(`${res.status} ${text}`);
  }
  const contentLength = res.headers.get('content-length');
  if (res.status === 204 || contentLength === '0') return undefined as T;
  const contentType = res.headers.get('content-type')?.toLowerCase() ?? '';
  const text = await res.text();
  if (!text) return undefined as T;
  if (contentType.includes('application/json')) {
    return JSON.parse(text) as T;
  }
  return text as T;
}

// ── Credentials ───────────────────────────────────────────────────────────────

export const credentials = {
  list(page = 1, limit = 50): Promise<PaginatedResponse<Credential>> {
    return request(`/credentials?page=${page}&limit=${limit}`);
  },
  get(id: string): Promise<Credential> {
    return request(`/credentials/${id}`);
  },
  create(name: string, data?: string): Promise<Credential> {
    return request('/credentials', {
      method: 'POST',
      body: JSON.stringify({ name, data }),
    });
  },
  update(id: string, patch: Partial<Pick<Credential, 'name' | 'data'>>): Promise<Credential> {
    return request(`/credentials/${id}`, {
      method: 'PATCH',
      body: JSON.stringify(patch),
    });
  },
  remove(id: string): Promise<void> {
    return request(`/credentials/${id}`, { method: 'DELETE' });
  },
  exportCredential(id: string): Promise<unknown> {
    return request(`/credentials/${id}/export`);
  },
  importCredential(payload: unknown): Promise<Credential> {
    return request('/credentials/import', {
      method: 'POST',
      body: JSON.stringify(payload),
    });
  },
};

// ── Snippets ──────────────────────────────────────────────────────────────────

export const snippets = {
  list(page = 1, limit = 50): Promise<PaginatedResponse<Snippet>> {
    return request(`/snippets?page=${page}&limit=${limit}`);
  },
  get(id: string): Promise<Snippet> {
    return request(`/snippets/${id}`);
  },
  create(payload: Pick<Snippet, 'name' | 'code'> & { description?: string }): Promise<Snippet> {
    return request('/snippets', {
      method: 'POST',
      body: JSON.stringify(payload),
    });
  },
  update(
    id: string,
    patch: Partial<Pick<Snippet, 'name' | 'description' | 'code'>>,
  ): Promise<Snippet> {
    return request(`/snippets/${id}`, {
      method: 'PATCH',
      body: JSON.stringify(patch),
    });
  },
  remove(id: string): Promise<void> {
    return request(`/snippets/${id}`, { method: 'DELETE' });
  },
  exportSnippet(id: string): Promise<unknown> {
    return request(`/snippets/${id}/export`);
  },
  importSnippet(payload: unknown): Promise<Snippet> {
    return request('/snippets/import', {
      method: 'POST',
      body: JSON.stringify(payload),
    });
  },
};

// ── Environments ──────────────────────────────────────────────────────────────

export const environments = {
  list(page = 1, limit = 50): Promise<PaginatedResponse<Environment>> {
    return request(`/environments?page=${page}&limit=${limit}`);
  },
  get(id: string): Promise<Environment> {
    return request(`/environments/${id}`);
  },
  create(name: string, urls: Environment['urls']): Promise<Environment> {
    return request('/environments', {
      method: 'POST',
      body: JSON.stringify({ name, urls }),
    });
  },
  update(id: string, patch: Partial<Pick<Environment, 'name' | 'urls'>>): Promise<Environment> {
    return request(`/environments/${id}`, {
      method: 'PATCH',
      body: JSON.stringify(patch),
    });
  },
  remove(id: string): Promise<void> {
    return request(`/environments/${id}`, { method: 'DELETE' });
  },
  exportEnvironment(id: string): Promise<unknown> {
    return request(`/environments/${id}/export`);
  },
  importEnvironment(payload: unknown): Promise<Environment> {
    return request('/environments/import', {
      method: 'POST',
      body: JSON.stringify(payload),
    });
  },
};

// ── Sessions ──────────────────────────────────────────────────────────────────

export const sessions = {
  list(page = 1, limit = 50): Promise<PaginatedResponse<Session>> {
    return request(`/sessions?page=${page}&limit=${limit}`);
  },
  get(id: string): Promise<Session> {
    return request(`/sessions/${id}`);
  },
  remove(id: string): Promise<void> {
    return request(`/sessions/${id}`, { method: 'DELETE' });
  },
};

// ── Scenarios ─────────────────────────────────────────────────────────────────

export const scenarios = {
  list(page = 1, limit = 50): Promise<PaginatedResponse<Scenario>> {
    return request(`/scenarios?page=${page}&limit=${limit}&orderBy=updatedAt&orderDir=DESC`);
  },
  get(id: string): Promise<Scenario & { steps: ScenarioStep[] }> {
    return request(`/scenarios/${id}`);
  },
  create(name: string): Promise<Scenario> {
    return request('/scenarios', {
      method: 'POST',
      body: JSON.stringify({ name }),
    });
  },
  update(id: string, patch: Partial<Pick<Scenario, 'name'>>): Promise<Scenario> {
    return request(`/scenarios/${id}`, {
      method: 'PATCH',
      body: JSON.stringify(patch),
    });
  },
  remove(id: string): Promise<void> {
    return request(`/scenarios/${id}`, { method: 'DELETE' });
  },
  run(id: string): Promise<ScenarioRun> {
    return request(`/scenarios/${id}/run`, { method: 'POST' });
  },
  getRun(scenarioId: string, runId: string): Promise<ScenarioRunDetail> {
    return request(`/scenarios/${scenarioId}/run/${runId}`);
  },
  waitForRun(scenarioId: string, runId: string): Promise<ScenarioRunDetail> {
    return request(`/scenarios/${scenarioId}/run/${runId}/wait`, { method: 'POST' });
  },
  listRuns(
    scenarioId: string,
    page = 1,
    limit = 20,
  ): Promise<PaginatedResponse<ScenarioRun & { stepRuns: ScenarioRunStep[] }>> {
    return request(`/scenarios/${scenarioId}/runs?page=${page}&limit=${limit}`);
  },
  exportScenario(id: string): Promise<string> {
    return request(`/scenarios/${id}/export`);
  },
  importScenario(payload: unknown): Promise<Scenario> {
    return request('/scenarios/import', {
      method: 'POST',
      body: JSON.stringify(payload),
    });
  },
};

// ── Runs ─────────────────────────────────────────────────────────────────────

export const runs = {
  listAll(
    page = 1,
    limit = 20,
    status?: string,
  ): Promise<
    PaginatedResponse<
      ScenarioRun & { stepRuns: ScenarioRunStep[]; scenario: { id: string; name: string } }
    >
  > {
    const q = new URLSearchParams({ page: String(page), limit: String(limit) });
    if (status) q.set('status', status);
    return request(`/scenarios/runs?${q}`);
  },
  list(
    scenarioId: string,
    page = 1,
    limit = 20,
  ): Promise<PaginatedResponse<ScenarioRun & { stepRuns: ScenarioRunStep[] }>> {
    return request(`/scenarios/${scenarioId}/runs?page=${page}&limit=${limit}`);
  },
  get(scenarioId: string, runId: string, q?: string): Promise<ScenarioRunDetail> {
    const qs = q?.trim() ? `?q=${encodeURIComponent(q.trim())}` : '';
    return request(`/scenarios/${scenarioId}/run/${runId}${qs}`);
  },
};

// ── Scenario Credentials ──────────────────────────────────────────────────────

export const scenarioCredentials = {
  list(scenarioId: string): Promise<ScenarioCredential[]> {
    return request(`/scenarios/${scenarioId}/credentials`);
  },
  add(scenarioId: string, credentialId: string, alias: string): Promise<ScenarioCredential> {
    return request(`/scenarios/${scenarioId}/credentials`, {
      method: 'POST',
      body: JSON.stringify({ credentialId, alias }),
    });
  },
  remove(scenarioId: string, scCredId: string): Promise<void> {
    return request(`/scenarios/${scenarioId}/credentials/${scCredId}`, {
      method: 'DELETE',
    });
  },
};

// ── Scenario Steps ────────────────────────────────────────────────────────────
export interface CreateStepPayload {
  title?: string;
  execCode?: string;
  validateCode?: string;
}

export interface UpdateStepPayload {
  title?: string;
  order?: number;
  execCode?: string;
  validateCode?: string;
}

export const steps = {
  get(scenarioId: string, stepId: string): Promise<ScenarioStep> {
    return request(`/scenarios/${scenarioId}/steps/${stepId}`);
  },
  create(scenarioId: string, payload: CreateStepPayload): Promise<ScenarioStep> {
    return request(`/scenarios/${scenarioId}/steps`, {
      method: 'POST',
      body: JSON.stringify(payload),
    });
  },
  update(scenarioId: string, stepId: string, payload: UpdateStepPayload): Promise<ScenarioStep> {
    return request(`/scenarios/${scenarioId}/steps/${stepId}`, {
      method: 'PATCH',
      body: JSON.stringify(payload),
    });
  },
  remove(scenarioId: string, stepId: string): Promise<void> {
    return request(`/scenarios/${scenarioId}/steps/${stepId}`, { method: 'DELETE' });
  },
};