const fs = require('fs-extra');
const path = require('path');
const isExample = process.env.IS_EXAMPLE === 'TRUE';
const DEFAULT_FILE_NAME = 'keys.development.json';
const PROJECT_ROOT_DIR_PATH = path.join(__dirname, isExample ? '../../example/' : '../../../../');
const PACKAGE_ROOT_DIR_PATH = path.join(__dirname, '../../');
const KEYS_IOS_PATH = path.join('node_modules', 'react-native-keys', 'ios');
const KEYS_ANDROID_PATH = path.join('node_modules', 'react-native-keys', 'android');
const KEYS_IOS_EXAMPLE_PATH = path.join('../', 'ios');
const KEYS_ANDROID_EXAMPLE_PATH = path.join('../', 'android');
const IOS_DIR_PATH = path.join(PROJECT_ROOT_DIR_PATH, isExample ? KEYS_IOS_EXAMPLE_PATH : KEYS_IOS_PATH);
const ANDROID_DIR_PATH = path.join(PROJECT_ROOT_DIR_PATH, isExample ? KEYS_ANDROID_EXAMPLE_PATH : KEYS_ANDROID_PATH, 'cpp');
const ANDROID_KEYS_DIR_PATH = path.join(PACKAGE_ROOT_DIR_PATH, 'android', 'src', 'main', 'java', 'com', 'reactnativekeysjsi');
const PROJECT_DIRECTORY_IOS_PATH = path.join(PROJECT_ROOT_DIR_PATH, 'ios');
module.exports.getKeys = KEYS_FILE_NAME => {
  const jniJsonFilePath = `${PROJECT_ROOT_DIR_PATH}${KEYS_FILE_NAME}`;
  const keysJson = fs.readJSONSync(jniJsonFilePath);
  const secureKeys = keysJson;
  return secureKeys;
};
module.exports.makeFileInIosDir = (fileContent, fileName) => {
  try {
    const iosCppFilePath = path.join(IOS_DIR_PATH, fileName);
    fs.outputFileSync(iosCppFilePath, fileContent);
    return true;
  } catch (error) {
    return false;
  }
};
module.exports.makeFileInProjectDirectoryIos = (fileContent, fileName) => {
  try {
    const iosCppFilePath = path.join(PROJECT_DIRECTORY_IOS_PATH, fileName);
    fs.outputFileSync(iosCppFilePath, fileContent);
    return true;
  } catch (error) {
    return false;
  }
};
module.exports.makeFileInCppAndroidDirectory = (fileContent, fileName) => {
  try {
    const filePath = path.join(ANDROID_DIR_PATH, fileName);
    fs.outputFileSync(filePath, fileContent);
    return true;
  } catch (error) {
    return false;
  }
};
module.exports.getIosEnviromentFile = () => {
  try {
    let KEYS_FILE_NAME = process.env.KEYSFILE;
    if (KEYS_FILE_NAME) {
      return KEYS_FILE_NAME;
    } else if (process.env.CONFIGURATION === 'Debug') {
      const debugFile = process.env.DEBUG_KEYSFILE || DEFAULT_FILE_NAME;
      return debugFile;
    } else if (process.env.CONFIGURATION === 'Release') {
      const debugFile = process.env.RELEASE_KEYSFILE || DEFAULT_FILE_NAME;
      return debugFile;
    }
    return DEFAULT_FILE_NAME;
  } catch (error) {
    return DEFAULT_FILE_NAME;
  }
};
module.exports.getAndroidEnviromentFile = () => {
  try {
    let KEYS_FILE_NAME = process.env.KEYSFILE;
    if (KEYS_FILE_NAME) {
      return KEYS_FILE_NAME;
    }
    return DEFAULT_FILE_NAME;
  } catch (error) {
    return DEFAULT_FILE_NAME;
  }
};
module.exports.makeFileInAndroidMainAssetsFolder = (fileContent, fileName) => {
  try {
    const filePath = path.join(ANDROID_KEYS_DIR_PATH, fileName);
    fs.outputFileSync(filePath, fileContent);
    return true;
  } catch (error) {
    return false;
  }
};
module.exports.makeEncryptionFile = key => {
  return `
  #include<iostream>
  #include<string.h>
  using namespace std;
  #define uchar unsigned char
  #define uint unsigned int

  #define DBL_INT_ADD(a,b,c) if (a > 0xffffffff - (c)) ++b; a += c;
  #define ROTLEFT(a,b) (((a) << (b)) | ((a) >> (32-(b))))
  #define ROTRIGHT(a,b) (((a) >> (b)) | ((a) << (32-(b))))

  #define CH(x,y,z) (((x) & (y)) ^ (~(x) & (z)))
  #define MAJ(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
  #define EP0(x) (ROTRIGHT(x,2) ^ ROTRIGHT(x,13) ^ ROTRIGHT(x,22))
  #define EP1(x) (ROTRIGHT(x,6) ^ ROTRIGHT(x,11) ^ ROTRIGHT(x,25))
  #define SIG0(x) (ROTRIGHT(x,7) ^ ROTRIGHT(x,18) ^ ((x) >> 3))
  #define SIG1(x) (ROTRIGHT(x,17) ^ ROTRIGHT(x,19) ^ ((x) >> 10))

  typedef struct {
    uchar data[64];
    uint datalen;
    uint bitlen[2];
    uint state[8];
  } SHA256_CTX;

  uint k[64] = {
    0x428a2f98,0x71374491,0xb5c0fbcf,0xe9b5dba5,0x3956c25b,0x59f111f1,0x923f82a4,0xab1c5ed5,
    0xd807aa98,0x12835b01,0x243185be,0x550c7dc3,0x72be5d74,0x80deb1fe,0x9bdc06a7,0xc19bf174,
    0xe49b69c1,0xefbe4786,0x0fc19dc6,0x240ca1cc,0x2de92c6f,0x4a7484aa,0x5cb0a9dc,0x76f988da,
    0x983e5152,0xa831c66d,0xb00327c8,0xbf597fc7,0xc6e00bf3,0xd5a79147,0x06ca6351,0x14292967,
    0x27b70a85,0x2e1b2138,0x4d2c6dfc,0x53380d13,0x650a7354,0x766a0abb,0x81c2c92e,0x92722c85,
    0xa2bfe8a1,0xa81a664b,0xc24b8b70,0xc76c51a3,0xd192e819,0xd6990624,0xf40e3585,0x106aa070,
    0x19a4c116,0x1e376c08,0x2748774c,0x34b0bcb5,0x391c0cb3,0x4ed8aa4a,0x5b9cca4f,0x682e6ff3,
    0x748f82ee,0x78a5636f,0x84c87814,0x8cc70208,0x90befffa,0xa4506ceb,0xbef9a3f7,0xc67178f2
  };

  void SHA256Transform(SHA256_CTX *ctx, uchar data[])
  {
    uint a, b, c, d, e, f, g, h, i, j, t1, t2, m[64];

    for (i = 0, j = 0; i < 16; ++i, j += 4)
      m[i] = (data[j] << 24) | (data[j + 1] << 16) | (data[j + 2] << 8) | (data[j + 3]);
    for (; i < 64; ++i)
      m[i] = SIG1(m[i - 2]) + m[i - 7] + SIG0(m[i - 15]) + m[i - 16];

    a = ctx->state[0];
    b = ctx->state[1];
    c = ctx->state[2];
    d = ctx->state[3];
    e = ctx->state[4];
    f = ctx->state[5];
    g = ctx->state[6];
    h = ctx->state[7];

    for (i = 0; i < 64; ++i) {
      t1 = h + EP1(e) + CH(e, f, g) + k[i] + m[i];
      t2 = EP0(a) + MAJ(a, b, c);
      h = g;
      g = f;
      f = e;
      e = d + t1;
      d = c;
      c = b;
      b = a;
      a = t1 + t2;
    }

    ctx->state[0] += a;
    ctx->state[1] += b;
    ctx->state[2] += c;
    ctx->state[3] += d;
    ctx->state[4] += e;
    ctx->state[5] += f;
    ctx->state[6] += g;
    ctx->state[7] += h;
  }

  void SHA256Init(SHA256_CTX *ctx)
  {
    ctx->datalen = 0;
    ctx->bitlen[0] = 0;
    ctx->bitlen[1] = 0;
    ctx->state[0] = 0x6a09e667;
    ctx->state[1] = 0xbb67ae85;
    ctx->state[2] = 0x3c6ef372;
    ctx->state[3] = 0xa54ff53a;
    ctx->state[4] = 0x510e527f;
    ctx->state[5] = 0x9b05688c;
    ctx->state[6] = 0x1f83d9ab;
    ctx->state[7] = 0x5be0cd19;
  }

  void SHA256Update(SHA256_CTX *ctx, uchar data[], uint len)
  {
    for (uint i = 0; i < len; ++i) {
      ctx->data[ctx->datalen] = data[i];
      ctx->datalen++;
      if (ctx->datalen == 64) {
        SHA256Transform(ctx, ctx->data);
        DBL_INT_ADD(ctx->bitlen[0], ctx->bitlen[1], 512);
        ctx->datalen = 0;
      }
    }
  }

  void SHA256Final(SHA256_CTX *ctx, uchar hash[])
  {
    uint i = ctx->datalen;

    if (ctx->datalen < 56) {
      ctx->data[i++] = 0x80;

      while (i < 56)
        ctx->data[i++] = 0x00;
    }
    else {
      ctx->data[i++] = 0x80;

      while (i < 64)
        ctx->data[i++] = 0x00;

      SHA256Transform(ctx, ctx->data);
      memset(ctx->data, 0, 56);
    }

    DBL_INT_ADD(ctx->bitlen[0], ctx->bitlen[1], ctx->datalen * 8);
    ctx->data[63] = ctx->bitlen[0];
    ctx->data[62] = ctx->bitlen[0] >> 8;
    ctx->data[61] = ctx->bitlen[0] >> 16;
    ctx->data[60] = ctx->bitlen[0] >> 24;
    ctx->data[59] = ctx->bitlen[1];
    ctx->data[58] = ctx->bitlen[1] >> 8;
    ctx->data[57] = ctx->bitlen[1] >> 16;
    ctx->data[56] = ctx->bitlen[1] >> 24;
    SHA256Transform(ctx, ctx->data);

    for (i = 0; i < 4; ++i) {
      hash[i] = (ctx->state[0] >> (24 - i * 8)) & 0x000000ff;
      hash[i + 4] = (ctx->state[1] >> (24 - i * 8)) & 0x000000ff;
      hash[i + 8] = (ctx->state[2] >> (24 - i * 8)) & 0x000000ff;
      hash[i + 12] = (ctx->state[3] >> (24 - i * 8)) & 0x000000ff;
      hash[i + 16] = (ctx->state[4] >> (24 - i * 8)) & 0x000000ff;
      hash[i + 20] = (ctx->state[5] >> (24 - i * 8)) & 0x000000ff;
      hash[i + 24] = (ctx->state[6] >> (24 - i * 8)) & 0x000000ff;
      hash[i + 28] = (ctx->state[7] >> (24 - i * 8)) & 0x000000ff;
    }
  }

  string SHA256(char* data) {
    int strLen = strlen(data);
    SHA256_CTX ctx;
    unsigned char hash[32];
    string hashStr = "";

    SHA256Init(&ctx);
    SHA256Update(&ctx, (unsigned char*)data, strLen);
    SHA256Final(&ctx, hash);

    char s[3];
    for (int i = 0; i < 32; i++) {
      sprintf(s, "%02x", hash[i]);
      hashStr += s;
    }

    return hashStr;
  }
  `;
};
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