import {
  mapCalculateScoresResponse,
  mapFinishGameResponse,
  mapHealthResponse,
  mapJoinSessionResponse,
  mapMixAnswersResponse,
  mapScoreboardResponse,
  mapSessionDetailResponse,
  mapShowQuestionResponse,
  mapStartNextRoundResponse,
  mapStartRoundResponse,
  mapSubmitGuessResponse,
  mapSubmitLieResponse
} from './mappers';
import type {
  ApiFailure,
  ApiResult,
  CalculateScoresResponse,
  FinishGameResponse,
  HealthResponse,
  JoinSessionRequest,
  JoinSessionResponse,
  MixAnswersResponse,
  ScoreboardResponse,
  SessionDetailResponse,
  ShowQuestionResponse,
  StartNextRoundResponse,
  StartRoundRequest,
  StartRoundResponse,
  SubmitGuessRequest,
  SubmitGuessResponse,
  SubmitLieRequest,
  SubmitLieResponse
} from './types';

export interface AngularHttpError {
  status?: number;
  message?: string;
  error?: unknown;
}

export interface AngularHttpClientLike {
  get<T>(url: string, options?: { withCredentials?: boolean }): Promise<T>;
  post<T>(url: string, body: unknown, options?: { withCredentials?: boolean }): Promise<T>;
}

export interface AngularApiClient {
  health(): Promise<ApiResult<HealthResponse>>;
  getSession(code: string): Promise<ApiResult<SessionDetailResponse>>;
  joinSession(payload: JoinSessionRequest): Promise<ApiResult<JoinSessionResponse>>;
  startRound(code: string, payload: StartRoundRequest): Promise<ApiResult<StartRoundResponse>>;
  showQuestion(code: string): Promise<ApiResult<ShowQuestionResponse>>;
  mixAnswers(code: string, roundQuestionId: number): Promise<ApiResult<MixAnswersResponse>>;
  calculateScores(code: string, roundQuestionId: number): Promise<ApiResult<CalculateScoresResponse>>;
  getScoreboard(code: string): Promise<ApiResult<ScoreboardResponse>>;
  startNextRound(code: string): Promise<ApiResult<StartNextRoundResponse>>;
  finishGame(code: string): Promise<ApiResult<FinishGameResponse>>;
  submitLie(code: string, roundQuestionId: number, payload: SubmitLieRequest): Promise<ApiResult<SubmitLieResponse>>;
  submitGuess(
    code: string,
    roundQuestionId: number,
    payload: SubmitGuessRequest
  ): Promise<ApiResult<SubmitGuessResponse>>;
}

function toFailure(error: unknown): ApiFailure {
  const candidate = (error ?? {}) as AngularHttpError;
  const status = typeof candidate.status === 'number' ? candidate.status : 0;
  const payload = candidate.error;

  if (status === 0) {
    return {
      kind: 'network',
      status: 0,
      message: candidate.message ?? 'Network error while contacting API'
    };
  }

  return {
    kind: 'http',
    status,
    message: candidate.message ?? `HTTP ${status}`,
    ...(payload === undefined ? {} : { payload })
  };
}

function normalizeCode(code: string): string {
  return code.trim().toUpperCase();
}

function normalizeBaseUrl(baseUrl: string): string {
  return baseUrl.endsWith('/') ? baseUrl.slice(0, -1) : baseUrl;
}

function buildUrl(baseUrl: string, path: string): string {
  return `${normalizeBaseUrl(baseUrl)}${path}`;
}

async function wrap<T>(call: () => Promise<unknown>, mapper: (payload: unknown) => T): Promise<ApiResult<T>> {
  let payload: unknown;
  try {
    payload = await call();
  } catch (error: unknown) {
    return {
      ok: false,
      status: typeof (error as AngularHttpError)?.status === 'number' ? (error as AngularHttpError).status! : 0,
      error: toFailure(error)
    };
  }

  try {
    return { ok: true, status: 200, data: mapper(payload) };
  } catch (error: unknown) {
    return {
      ok: false,
      status: 200,
      error: {
        kind: 'parse',
        status: 200,
        message: error instanceof Error ? error.message : 'Invalid API response contract',
        payload
      }
    };
  }
}

export function createAngularApiClient(http: AngularHttpClientLike, baseUrl = ''): AngularApiClient {
  return {
    health: () =>
      wrap(() => http.get<HealthResponse>(buildUrl(baseUrl, '/healthz'), { withCredentials: true }), mapHealthResponse),
    getSession: (code: string) =>
      wrap(
        () =>
          http.get<SessionDetailResponse>(buildUrl(baseUrl, `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}`), {
            withCredentials: true
          }),
        mapSessionDetailResponse
      ),
    joinSession: (payload: JoinSessionRequest) =>
      wrap(
        () =>
          http.post<JoinSessionResponse>(
            buildUrl(baseUrl, '/lobby/sessions/join'),
            {
              code: normalizeCode(payload.code),
              nickname: payload.nickname.trim()
            },
            { withCredentials: true }
          ),
        mapJoinSessionResponse
      ),
    startRound: (code: string, payload: StartRoundRequest) =>
      wrap(
        () =>
          http.post<StartRoundResponse>(
            buildUrl(baseUrl, `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}/rounds/start`),
            payload,
            { withCredentials: true }
          ),
        mapStartRoundResponse
      ),
    showQuestion: (code: string) =>
      wrap(
        () =>
          http.post<ShowQuestionResponse>(
            buildUrl(baseUrl, `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}/questions/show`),
            {},
            { withCredentials: true }
          ),
        mapShowQuestionResponse
      ),
    mixAnswers: (code: string, roundQuestionId: number) =>
      wrap(
        () =>
          http.post<MixAnswersResponse>(
            buildUrl(
              baseUrl,
              `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}/questions/${roundQuestionId}/answers/mix`
            ),
            {},
            { withCredentials: true }
          ),
        mapMixAnswersResponse
      ),
    calculateScores: (code: string, roundQuestionId: number) =>
      wrap(
        () =>
          http.post<CalculateScoresResponse>(
            buildUrl(
              baseUrl,
              `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}/questions/${roundQuestionId}/scores/calculate`
            ),
            {},
            { withCredentials: true }
          ),
        mapCalculateScoresResponse
      ),
    getScoreboard: (code: string) =>
      wrap(
        () =>
          http.get<ScoreboardResponse>(
            buildUrl(baseUrl, `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}/scoreboard`),
            { withCredentials: true }
          ),
        mapScoreboardResponse
      ),
    startNextRound: (code: string) =>
      wrap(
        () =>
          http.post<StartNextRoundResponse>(
            buildUrl(baseUrl, `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}/rounds/next`),
            {},
            { withCredentials: true }
          ),
        mapStartNextRoundResponse
      ),
    finishGame: (code: string) =>
      wrap(
        () =>
          http.post<FinishGameResponse>(
            buildUrl(baseUrl, `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}/finish`),
            {},
            { withCredentials: true }
          ),
        mapFinishGameResponse
      ),
    submitLie: (code: string, roundQuestionId: number, payload: SubmitLieRequest) =>
      wrap(
        () =>
          http.post<SubmitLieResponse>(
            buildUrl(
              baseUrl,
              `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}/questions/${roundQuestionId}/lies/submit`
            ),
            {
              player_id: payload.player_id,
              session_token: payload.session_token,
              text: payload.text
            },
            { withCredentials: true }
          ),
        mapSubmitLieResponse
      ),
    submitGuess: (code: string, roundQuestionId: number, payload: SubmitGuessRequest) =>
      wrap(
        () =>
          http.post<SubmitGuessResponse>(
            buildUrl(
              baseUrl,
              `/lobby/sessions/${encodeURIComponent(normalizeCode(code))}/questions/${roundQuestionId}/guesses/submit`
            ),
            {
              player_id: payload.player_id,
              session_token: payload.session_token,
              selected_text: payload.selected_text
            },
            { withCredentials: true }
          ),
        mapSubmitGuessResponse
      )
  };
}