const functions = require("firebase-functions");
const admin = require("firebase-admin");

let key = "./serviceAccountKey.json";

if (process.env.GCLOUD_PROJECT === "monkey-type") {
  key = "./serviceAccountKey_live.json";
}

var serviceAccount = require(key);

admin.initializeApp({
  credential: admin.credential.cert(serviceAccount),
});

const db = admin.firestore();

exports.moveResults = functions
  .runWith({ timeoutSeconds: 540, memory: "2GB" })
  .https.onCall((request, response) => {
    return db
      .collection("results")
      .orderBy("timestamp", "desc")
      .limit(2000)
      .get()
      .then((data) => {
        data.docs.forEach((doc) => {
          let result = doc.data();
          if (result.moved === undefined || result.moved === false) {
            db.collection(`results`).doc(doc.id).update({ moved: true });
            db.collection(`users/${result.uid}/results`).add(result);
            console.log(`moving doc ${doc.id}`);
          }
        });
        return;
      });
  });

function getAllNames() {
  return admin
    .auth()
    .listUsers()
    .then((data) => {
      let names = [];
      data.users.forEach((user) => {
        names.push(user.displayName);
      });
      return names;
    });
}

function getAllUsers() {
  return admin
    .auth()
    .listUsers()
    .then((data) => {
      return data.users;
    });
}

function isUsernameValid(name) {
  if (name === null || name === undefined || name === "") return false;
  if (/miodec/.test(name)) return false;
  if (name.length > 12) return false;
  return /^[0-9a-zA-Z_.-]+$/.test(name);
}

exports.checkNameAvailability = functions.https.onCall((request, response) => {
  // 1 - available
  // -1 - unavailable (taken)
  // -2 - not valid name
  // -999 - unknown error
  try {
    if (!isUsernameValid(request.name)) return -2;
    return getAllNames().then((data) => {
      let available = 1;
      data.forEach((name) => {
        try {
          if (name.toLowerCase() === request.name.toLowerCase()) available = -1;
        } catch (e) {
          //
        }
      });
      return available;
    });
  } catch (e) {
    return -999;
  }
});

exports.changeName = functions.https.onCall((request, response) => {
  try {
    if (!isUsernameValid(request.name)) {
      console.warn(
        `${request.uid} tried to change their name to ${request.name} - not valid`
      );
      return 0;
    }
    return getAllNames().then((data) => {
      let available = 1;
      data.forEach((name) => {
        try {
          if (name.toLowerCase() === request.name.toLowerCase()) available = 0;
        } catch (e) {
          //
        }
      });
      if (available === 1) {
        return admin
          .auth()
          .updateUser(request.uid, {
            displayName: request.name,
          })
          .then((d) => {
            console.log(
              `${request.uid} changed their name to ${request.name} - done`
            );
            return 1;
          })
          .catch((e) => {
            console.error(
              `${request.uid} tried to change their name to ${request.name} - ${e.message}`
            );
            return -1;
          });
      } else {
        console.warn(
          `${request.uid} tried to change their name to ${request.name} - already taken`
        );
        return 0;
      }
    });
  } catch (e) {
    console.error(
      `${request.uid} tried to change their name to ${request.name} - ${e}`
    );
    return -1;
  }
});

exports.checkIfNeedsToChangeName = functions.https.onCall(
  (request, response) => {
    try {
      return admin
        .auth()
        .getUser(request.uid)
        .then((requestUser) => {
          if (!isUsernameValid(requestUser.displayName)) {
            //invalid name, needs to change
            console.log(
              `user ${requestUser.uid} ${requestUser.displayName} needs to change name`
            );
            return 1;
          } else {
            //valid name, but need to change if not duplicate

            return getAllUsers().then((users) => {
              let sameName = [];

              //look for name names
              users.forEach((user) => {
                if (user.uid !== requestUser.uid) {
                  try {
                    if (
                      user.displayName.toLowerCase() ===
                      requestUser.displayName.toLowerCase()
                    ) {
                      sameName.push(user);
                    }
                  } catch (e) {
                    //
                  }
                }
              });

              if (sameName.length === 0) {
                return 0;
              } else {
                //check when the request user made the account compared to others
                let earliestTimestamp = 999999999999999;
                sameName.forEach((sn) => {
                  let ts = new Date(sn.metadata.creationTime).getTime() / 1000;
                  if (ts <= earliestTimestamp) {
                    earliestTimestamp = ts;
                  }
                });

                if (
                  new Date(requestUser.metadata.creationTime).getTime() / 1000 >
                  earliestTimestamp
                ) {
                  console.log(
                    `user ${requestUser.uid} ${requestUser.displayName} needs to change name`
                  );
                  return 2;
                } else {
                  return 0;
                }
              }
            });
          }
        });
    } catch (e) {
      return -1;
    }
  }
);

function checkIfPB(uid, obj) {
  return db
    .collection(`users`)
    .doc(uid)
    .get()
    .then((data) => {
      let pbs = null;
      try {
        pbs = data.data().personalBests;
        if (pbs === undefined) {
          throw new Error("pb is undefined");
        }
      } catch (e) {
        return db
          .collection("users")
          .doc(uid)
          .update({
            personalBests: {
              [obj.mode]: {
                [obj.mode2]: [
                  {
                    language: obj.language,
                    difficulty: obj.difficulty,
                    punctuation: obj.punctuation,
                    wpm: obj.wpm,
                  },
                ],
              },
            },
          })
          .then((e) => {
            return true;
          })
          .catch((e) => {
            return db
              .collection("users")
              .doc(uid)
              .set({
                personalBests: {
                  [obj.mode]: {
                    [obj.mode2]: [
                      {
                        language: obj.language,
                        difficulty: obj.difficulty,
                        punctuation: obj.punctuation,
                        wpm: obj.wpm,
                      },
                    ],
                  },
                },
              })
              .then((e) => {
                return true;
              });
          });
      }
      // //check mode, mode2, punctuation, language and difficulty

      let toUpdate = false;
      let found = false;
      try {
        pbs[obj.mode][obj.mode2].forEach((pb) => {
          if (
            pb.punctuation === obj.punctuation &&
            pb.difficulty === obj.difficulty &&
            pb.language === obj.language
          ) {
            //entry like this already exists, compare wpm
            found = true;
            if (pb.wpm < obj.wpm) {
              //new pb
              pb.wpm = obj.wpm;
              toUpdate = true;
            } else {
              //no pb
              return false;
            }
          }
        });
        //checked all pbs, nothing found - meaning this is a new pb
        if (!found) {
          pbs[obj.mode][obj.mode2].push({
            language: obj.language,
            difficulty: obj.difficulty,
            punctuation: obj.punctuation,
            wpm: obj.wpm,
          });
          toUpdate = true;
        }
      } catch (e) {
        // console.log(e);
        pbs[obj.mode] = {};
        pbs[obj.mode][obj.mode2] = [
          {
            language: obj.language,
            difficulty: obj.difficulty,
            punctuation: obj.punctuation,
            wpm: obj.wpm,
          },
        ];
        toUpdate = true;
      }

      if (toUpdate) {
        return db
          .collection("users")
          .doc(uid)
          .update({ personalBests: pbs })
          .then((e) => {
            return true;
          });
      } else {
        return false;
      }
    });
}

exports.testCompleted = functions.https.onCall((request, response) => {
  try {
    if (request.uid === undefined || request.obj === undefined) {
      console.error(`error saving result for ${request.uid} - missing input`);
      return -1;
    }

    let obj = request.obj;

    let err = false;
    Object.keys(obj).forEach((key) => {
      let val = obj[key];
      if (Array.isArray(val)) {
        val.forEach((valarr) => {
          if (!/^[0-9a-zA-Z._]+$/.test(valarr)) err = true;
        });
      } else {
        if (val === undefined || !/^[0-9a-zA-Z._]+$/.test(val)) err = true;
      }
    });
    if (err) {
      console.error(
        `error saving result for ${request.uid} - bad input - ${JSON.stringify(
          request.obj
        )}`
      );
      return -1;
    }

    if (obj.wpm <= 0 || obj.wpm > 350 || obj.acc < 50 || obj.acc > 100) {
      return -1;
    }

    db.collection("users")
      .doc(request.uid)
      .get()
      .then((ret) => {
        let userdata = ret.data();
        return db
          .collection(`users/${request.uid}/results`)
          .add(obj)
          .then((e) => {
            return checkIfPB(request.uid, request.obj).then((e) => {
              if (e) {
                console.log(
                  `saved result for ${request.uid} (new PB) - ${JSON.stringify(
                    request.obj
                  )}`
                );
                if (obj.mode === "time" && String(obj.mode2) === "60") {
                  let besttime60 = 0;
                  try {
                    userdata.personalBests.time[60].forEach((result) => {
                      if (result.wpm > besttime60) besttime60 = result.wpm;
                    });
                  } catch (e) {
                    besttime60 = 0;
                  }

                  if (obj.wpm >= besttime60) {
                    console.log(
                      `sending command to the bot to update the role for user ${request.uid} with wpm ${obj.wpm}`
                    );
                    updateDiscordRole(userdata.discordId, obj.wpm);
                  }
                  return;
                }
                return 2;
              } else {
                console.log(
                  `saved result for ${request.uid} - ${JSON.stringify(
                    request.obj
                  )}`
                );
                return 1;
              }
            });
          })
          .catch((e) => {
            console.error(
              `error saving result when checking for PB for ${request.uid} - ${e.message}`
            );
            return -1;
          });
      })
      .catch((e) => {
        console.error(
          `error saving result when getting user info ${request.uid} - ${e.message}`
        );
        return -1;
      });
  } catch (e) {
    console.error(`error saving result for ${request.uid} - ${e}`);
    return -1;
  }
});

function updateDiscordRole(discordId, wpm) {
  db.collection("bot-commands").add({
    command: "updateRole",
    arguments: [discordId, wpm],
    executed: false,
    requestTimestamp: Date.now(),
  });
}

function isTagValid(name) {
  if (name === null || name === undefined || name === "") return false;
  if (name.length > 16) return false;
  return /^[0-9a-zA-Z_.-]+$/.test(name);
}

exports.addTag = functions.https.onCall((request, response) => {
  try {
    if (!isTagValid(request.name)) {
      return { resultCode: -1 };
    } else {
      return db
        .collection(`users/${request.uid}/tags`)
        .add({
          name: request.name,
        })
        .then((e) => {
          console.log(`user ${request.uid} created a tag: ${request.name}`);
          return {
            resultCode: 1,
            id: e.id,
          };
        })
        .catch((e) => {
          console.error(
            `error while creating tag for user ${request.uid}: ${e.message}`
          );
          return { resultCode: -999 };
        });
    }
  } catch (e) {
    console.error(`error adding tag for ${request.uid} - ${e}`);
    return { resultCode: -999 };
  }
});

exports.editTag = functions.https.onCall((request, response) => {
  try {
    if (!isTagValid(request.name)) {
      return { resultCode: -1 };
    } else {
      return db
        .collection(`users/${request.uid}/tags`)
        .doc(request.tagid)
        .update({
          name: request.name,
        })
        .then((e) => {
          console.log(`user ${request.uid} updated a tag: ${request.name}`);
          return {
            resultCode: 1,
          };
        })
        .catch((e) => {
          console.error(
            `error while updating tag for user ${request.uid}: ${e.message}`
          );
          return { resultCode: -999 };
        });
    }
  } catch (e) {
    console.error(`error updating tag for ${request.uid} - ${e}`);
    return { resultCode: -999 };
  }
});

exports.removeTag = functions.https.onCall((request, response) => {
  try {
    return db
      .collection(`users/${request.uid}/tags`)
      .doc(request.tagid)
      .delete()
      .then((e) => {
        console.log(`user ${request.uid} deleted a tag`);
        return {
          resultCode: 1,
        };
      })
      .catch((e) => {
        console.error(
          `error deleting tag for user ${request.uid}: ${e.message}`
        );
        return { resultCode: -999 };
      });
  } catch (e) {
    console.error(`error deleting tag for ${request.uid} - ${e}`);
    return { resultCode: -999 };
  }
});

exports.updateResultTags = functions.https.onCall((request, response) => {
  try {
    let validTags = true;
    request.tags.forEach((tag) => {
      if (!/^[0-9a-zA-Z]+$/.test(tag)) validTags = false;
    });
    if (validTags) {
      return db
        .collection(`users/${request.uid}/results`)
        .doc(request.resultid)
        .update({
          tags: request.tags,
        })
        .then((e) => {
          console.log(
            `user ${request.uid} updated tags for result ${request.resultid}`
          );
          return {
            resultCode: 1,
          };
        })
        .catch((e) => {
          console.error(
            `error while updating tags for result by user ${request.uid}: ${e.message}`
          );
          return { resultCode: -999 };
        });
    } else {
      console.error(`invalid tags for user ${request.uid}: ${request.tags}`);
      return { resultCode: -1 };
    }
  } catch (e) {
    console.error(`error updating tags by ${request.uid} - ${e}`);
    return { resultCode: -999 };
  }
});

function isConfigKeyValid(name) {
  if (name === null || name === undefined || name === "") return false;
  if (name.length > 30) return false;
  return /^[0-9a-zA-Z_.\-#]+$/.test(name);
}

exports.saveConfig = functions.https.onCall((request, response) => {
  try {
    if (request.uid === undefined || request.obj === undefined) {
      console.error(`error saving config for ${request.uid} - missing input`);
      return -1;
    }

    let obj = request.obj;

    let err = false;
    Object.keys(obj).forEach((key) => {
      let val = obj[key];
      if (Array.isArray(val)) {
        val.forEach((valarr) => {
          if (!isConfigKeyValid(valarr)) {
            err = true;
            console.error(`${key}: ${valarr} failed regex check`);
          }
        });
      } else {
        if (!isConfigKeyValid(val)) {
          err = true;
          console.error(`${key}: ${val} failed regex check`);
        }
      }
    });
    if (err) {
      console.error(
        `error saving config for ${request.uid} - bad input - ${JSON.stringify(
          request.obj
        )}`
      );
      return -1;
    }

    return db
      .collection(`users`)
      .doc(request.uid)
      .set(
        {
          config: obj,
        },
        { merge: true }
      )
      .then((e) => {
        return 1;
      })
      .catch((e) => {
        console.error(
          `error saving config to DB for ${request.uid} - ${e.message}`
        );
        return -1;
      });
  } catch (e) {
    console.error(`error saving config for ${request.uid} - ${e}`);
    return { resultCode: -999 };
  }
});

function generate(n) {
  var add = 1,
    max = 12 - add;

  if (n > max) {
    return generate(max) + generate(n - max);
  }

  max = Math.pow(10, n + add);
  var min = max / 10; // Math.pow(10, n) basically
  var number = Math.floor(Math.random() * (max - min + 1)) + min;

  return ("" + number).substring(add);
}

exports.generatePairingCode = functions.https.onCall((request, response) => {
  try {
    if (request === null) {
      console.error(
        `error while trying to generate discord pairing code - no input`
      );
      return {
        status: -999,
      };
    }

    return db
      .collection("users")
      .doc(request.uid)
      .get()
      .then((userDoc) => {
        userDocData = userDoc.data();
        if (userDocData.discordPairingCode !== undefined) {
          console.log(
            `user ${request.uid} already has code ${userDocData.discordPairingCode}`
          );
          return {
            status: 2,
            pairingCode: userDocData.discordPairingCode,
          };
        } else {
          return db
            .collection("users")
            .get()
            .then((res) => {
              let existingCodes = [];

              res.docs.forEach((doc) => {
                let docData = doc.data();
                if (docData.discordPairingCode !== undefined) {
                  existingCodes.push(docData.discordPairingCode);
                }
              });

              console.log(`existing codes ${JSON.stringify(existingCodes)}`);

              let randomCode = generate(9);

              while (existingCodes.includes(randomCode)) {
                randomCode = generate(9);
              }

              return db
                .collection("users")
                .doc(request.uid)
                .update(
                  {
                    discordPairingCode: randomCode,
                  },
                  { merge: true }
                )
                .then((res) => {
                  console.log(
                    `generated ${randomCode} for user ${request.uid}`
                  );
                  return {
                    status: 1,
                    pairingCode: randomCode,
                  };
                })
                .catch((e) => {
                  console.error(
                    `error while trying to set discord pairing code ${randomCode} for user ${request.uid} - ${e}`
                  );
                  return {
                    status: -999,
                  };
                });
            });
        }
      });
  } catch (e) {
    console.error(
      `error while trying to generate discord pairing code for user ${request.uid} - ${e}`
    );
    return {
      status: -999,
    };
  }
});

// exports.getConfig = functions.https.onCall((request,response) => {
//     try{
//         if(request.uid === undefined){
//             console.error(`error getting config for ${request.uid} - missing input`);
//             return -1;
//         }

//         return admin.firestore().collection(`users`).doc(request.uid).get().then(e => {
//             return e.data().config;
//         }).catch(e => {
//             console.error(`error getting config from DB for ${request.uid} - ${e.message}`);
//             return -1;
//         });
//     }catch(e){
//         console.error(`error getting config for ${request.uid} - ${e}`);
//         return {resultCode:-999};
//     }
// })