import {Client, CredentialManager, ok} from '@atcute/client';
import {fetchPDSMooverDIDWeb, handleAndPDSResolver} from './atprotoUtils.js';


class BackupService {
  constructor() {
    /**
         *
         * @type {Client}
         */
    this.atCuteClient = null;
    /**
         *
         * @type {CredentialManager}
         */
    this.atCuteCredentialManager = null;
  }

  // Perform backup sign-up using user credentials. If the server requires 2FA,
  // it will throw with error.error === 'AuthFactorTokenRequired'.
  async loginAndStatus(identifier, password, onStatus = null, twoFactorCode = null) {
    let {pds} = await handleAndPDSResolver(identifier);


    const manager = new CredentialManager({
      service: pds
    });

    //TODO prob should be a function param, but eh
    const didWeb = await fetchPDSMooverDIDWeb(window.location.origin);

    const rpc = new Client({
      handler: manager,
      proxy: {
        did: didWeb,
        serviceId: '#repo_backup'
      }
    });

    try {
      if (onStatus) onStatus('Signing in…');

      let loginInput = {
        identifier,
        password,

      };
      if (twoFactorCode) {
        loginInput.code = twoFactorCode;
      }
      await manager.login(loginInput);


      // Make the client/manager available regardless of repo status so we can sign up if needed.
      this.atCuteClient = rpc;
      this.atCuteCredentialManager = manager;

      if (onStatus) onStatus('Checking backup status');
      const result = await rpc.get('com.pdsmoover.backup.getRepoStatus', {
        params: {
          did: manager.session.did.toString()
        }
      });
      if (result.ok) {
        return result.data;
      } else {
        switch (result.data.error) {
        case 'RepoNotFound':
          console.log('Repo not found');
          return null;
        default:
          throw result.data.error;
        }

      }
    } catch (err) {
      throw err;
    }
  }

  // Sign up for backups. Optionally create a new recovery key on signup.
  async signUp(onStatus = null) {
    if (!this.atCuteClient || !this.atCuteCredentialManager) {
      throw new Error('Not signed in');
    }
    if (onStatus) onStatus('Creating backup registration…');
    const data = await ok(
      this.atCuteClient.post('com.pdsmoover.backup.signUp', {
        as: null,
      })
    );
    if (onStatus) onStatus('Backup registration complete');
    return data;
  }

  async requestAPlcToken() {
    if (!this.atCuteClient || !this.atCuteCredentialManager) {
      throw new Error('Not signed in');
    }
    const rpc = new Client({
      handler: this.atCuteCredentialManager,
    });

    let response = await rpc.post('com.atproto.identity.requestPlcOperationSignature', {
      as: null,
    });
    if (!response.ok) {
      throw new Error(response.data?.message || 'Failed to request PLC token');
    }
  }

  async addANewRotationKey(plcToken, rotationKey) {
    if (!this.atCuteClient || !this.atCuteCredentialManager) {
      throw new Error('Not signed in');
    }


    const rpc = new Client({
      handler: this.atCuteCredentialManager,
    });

    let getDidCredentials = await rpc.get('com.atproto.identity.getRecommendedDidCredentials');

    if (getDidCredentials.ok) {
      const pdsProvidedRotationKeys = getDidCredentials.data.rotationKeys ?? [];
      const updatedRotationKeys = [rotationKey, ...pdsProvidedRotationKeys];

      const credentials = {
        ...getDidCredentials.data,
        rotationKeys: updatedRotationKeys,
      };

      const signDocRes = await rpc.post('com.atproto.identity.signPlcOperation', {
        input: {
          token: plcToken,
          ...credentials,
        }
      });

      if (signDocRes.ok) {
        const submitDocRes = await rpc.post('com.atproto.identity.submitPlcOperation', {
          input: signDocRes.data,
          as: null,
        });

        if (!submitDocRes.ok) {
          throw new Error(submitDocRes.data?.message || 'Failed to submit PLC operation');
        }

      } else {
        throw new Error(signDocRes.data?.message || 'Failed to sign PLC operation');
      }


    } else {
      throw new Error(getDidCredentials.data?.message || 'Failed to get status');
    }
  }

  async getUsersRepoStatus(onStatus = null) {
    if (!this.atCuteClient || !this.atCuteCredentialManager) {
      throw new Error('Not signed in');
    }
    if (onStatus) onStatus('Refreshing backup status…');
    const result = await this.atCuteClient.get('com.pdsmoover.backup.getRepoStatus', {
      params: {did: this.atCuteCredentialManager.session.did.toString()}
    });
    if (result.ok) {
      return result.data;
    } else {
      throw new Error(result.data?.message || 'Failed to get status');
    }
  }

  async runBackupNow(onStatus = null) {
    if (!this.atCuteClient || !this.atCuteCredentialManager) {
      throw new Error('Not signed in');
    }
    if (onStatus) onStatus('Requesting backup…');
    const res = await this.atCuteClient.post('com.pdsmoover.backup.requestBackup', {as: null, data: {}});
    if (res.ok) {
      if (onStatus) onStatus('Backup requested.');
      // After requesting, refresh status to reflect any immediate changes
      try {
        await this.refreshStatus(onStatus);
      } catch (_) { /* ignore */
      }
      return true;
    } else {
      const err = res.data;
      if (err?.error === 'Timeout') {
        throw {error: 'Timeout', message: err?.message || 'Please wait a few minutes before requesting again.'};
      }
      throw new Error(err?.message || 'Failed to request backup');
    }
  }

  // Remove (delete) the user's backup repository
  async removeRepo(onStatus = null) {
    if (!this.atCuteClient || !this.atCuteCredentialManager) {
      throw new Error('Not signed in');
    }
    if (onStatus) onStatus('Deleting backup repository…');
    const res = await this.atCuteClient.post('com.pdsmoover.backup.removeRepo', {as: null, data: {}});
    if (res.ok) {
      if (onStatus) onStatus('Backup repository deleted.');
      return true;
    } else {
      const err = res.data;
      throw new Error(err?.message || 'Failed to delete backup repository');
    }
  }
}


export {BackupService};