diff --git a/Cargo.lock b/Cargo.lock
index 0881763..7da89c0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -29,21 +29,27 @@ dependencies = [
  "zerocopy",
 ]
 
-[[package]]
-name = "aho-corasick"
-version = "1.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b2969dcb958b36655471fc61f7e416fa76033bdd4bfed0678d8fee1e2d07a1f0"
-dependencies = [
- "memchr",
-]
-
 [[package]]
 name = "allocator-api2"
 version = "0.2.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0942ffc6dcaadf03badf6e6a2d0228460359d5e34b57ccdc720b7382dfbd5ec5"
 
+[[package]]
+name = "android-tzdata"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e999941b234f3131b00bc13c22d06e8c5ff726d1b6318ac7eb276997bbb4fef0"
+
+[[package]]
+name = "android_system_properties"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "819e7219dbd41043ac279b19830f2efc897156490d7fd6ea916720117ee66311"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "aquamarine"
 version = "0.1.12"
@@ -98,9 +104,9 @@ checksum = "ed570934406eb16438a4e976b1b4500774099c13b8cb96eec99f620f05090ddf"
 
 [[package]]
 name = "bumpalo"
-version = "3.14.0"
+version = "3.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7f30e7476521f6f8af1a1c4c0b8cc94f0bee37d91763d0ca2665f299b6cd8aec"
+checksum = "d32a994c2b3ca201d9b263612a374263f05e7adde37c4707f693dcd375076d1f"
 
 [[package]]
 name = "bytes"
@@ -125,11 +131,16 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "chrono"
-version = "0.4.33"
+version = "0.4.34"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9f13690e35a5e4ace198e7beea2895d29f3a9cc55015fcebe6336bd2010af9eb"
+checksum = "5bc015644b92d5890fab7489e49d21f879d5c990186827d42ec511919404f38b"
 dependencies = [
+ "android-tzdata",
+ "iana-time-zone",
+ "js-sys",
  "num-traits",
+ "wasm-bindgen",
+ "windows-targets 0.52.0",
 ]
 
 [[package]]
@@ -202,6 +213,12 @@ dependencies = [
  "syn 1.0.109",
 ]
 
+[[package]]
+name = "dotenv"
+version = "0.15.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77c90badedccf4105eca100756a0b1289e191f6fcbdadd3cee1d2f614f97da8f"
+
 [[package]]
 name = "dptree"
 version = "0.3.0"
@@ -213,9 +230,9 @@ dependencies = [
 
 [[package]]
 name = "either"
-version = "1.9.0"
+version = "1.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a26ae43d7bcc3b814de94796a5e736d4029efb0ee900c12e2d54c993ad1a1e07"
+checksum = "11157ac094ffbdde99aa67b23417ebdd801842852b500e395a45a9c0aac03e4a"
 
 [[package]]
 name = "encoding_rs"
@@ -226,19 +243,6 @@ dependencies = [
  "cfg-if",
 ]
 
-[[package]]
-name = "env_logger"
-version = "0.10.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4cd405aab171cb85d6735e5c8d9db038c17d3ca007a4d2c25f337935c3d90580"
-dependencies = [
- "humantime",
- "is-terminal",
- "log",
- "regex",
- "termcolor",
-]
-
 [[package]]
 name = "equivalent"
 version = "1.0.1"
@@ -457,20 +461,28 @@ dependencies = [
  "hashbrown",
 ]
 
+[[package]]
+name = "heck"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "95505c38b4572b2d910cecb0281560f54b440a19336cbbcb27bf6ce6adc6f5a8"
+
 [[package]]
 name = "hermit-abi"
-version = "0.3.5"
+version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d0c62115964e08cb8039170eb33c1d0e2388a256930279edca206fff675f82c3"
+checksum = "bd5256b483761cd23699d0da46cc6fd2ee3be420bbe6d020ae4a091e70b7e9fd"
 
 [[package]]
 name = "hh"
 version = "0.1.0"
 dependencies = [
+ "chrono",
+ "dotenv",
  "log",
- "pretty_env_logger",
  "rusqlite",
  "teloxide",
+ "thiserror",
  "tokio",
 ]
 
@@ -508,12 +520,6 @@ version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "df3b46402a9d5adb4c86a0cf463f42e19994e3ee891101b1841f30a545cb49a9"
 
-[[package]]
-name = "humantime"
-version = "2.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9a3a5bfb195931eeb336b2a7b4d761daec841b97f947d34394601737a7bba5e4"
-
 [[package]]
 name = "hyper"
 version = "0.14.28"
@@ -551,6 +557,29 @@ dependencies = [
  "tokio-native-tls",
 ]
 
+[[package]]
+name = "iana-time-zone"
+version = "0.1.60"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e7ffbb5a1b541ea2561f8c41c087286cc091e21e556a4f09a8f6cbf17b69b141"
+dependencies = [
+ "android_system_properties",
+ "core-foundation-sys",
+ "iana-time-zone-haiku",
+ "js-sys",
+ "wasm-bindgen",
+ "windows-core",
+]
+
+[[package]]
+name = "iana-time-zone-haiku"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f31827a206f56af32e590ba56d5d2d085f558508192593743f16b2306495269f"
+dependencies = [
+ "cc",
+]
+
 [[package]]
 name = "ident_case"
 version = "1.0.1"
@@ -569,9 +598,9 @@ dependencies = [
 
 [[package]]
 name = "indexmap"
-version = "2.2.0"
+version = "2.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cf2a4f498956c7723dc280afc6a37d0dec50b39a29e232c6187ce4503703e8c2"
+checksum = "233cf39063f058ea2caae4091bf4a3ef70a653afbc026f5c4a4135d114e3c177"
 dependencies = [
  "equivalent",
  "hashbrown",
@@ -583,17 +612,6 @@ version = "2.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8f518f335dce6725a761382244631d86cf0ccb2863413590b31338feb467f9c3"
 
-[[package]]
-name = "is-terminal"
-version = "0.4.10"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0bad00257d07be169d870ab665980b06cdb366d792ad690bf2e76876dc503455"
-dependencies = [
- "hermit-abi",
- "rustix",
- "windows-sys 0.52.0",
-]
-
 [[package]]
 name = "itertools"
 version = "0.9.0"
@@ -611,9 +629,9 @@ checksum = "b1a46d1a171d865aa5f83f92695765caa047a9b4cbae2cbf37dbd613a793fd4c"
 
 [[package]]
 name = "js-sys"
-version = "0.3.67"
+version = "0.3.68"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9a1d36f1235bc969acba30b7f5990b864423a6068a10f7c90ae8f0112e3a59d1"
+checksum = "406cda4b368d531c842222cf9d2600a9a4acce8d29423695379c6868a143a9ee"
 dependencies = [
  "wasm-bindgen",
 ]
@@ -626,9 +644,9 @@ checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
 [[package]]
 name = "libc"
-version = "0.2.152"
+version = "0.2.153"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "13e3bf6590cbc649f4d1a3eefc9d5d6eb746f5200ffb04e5e142700b8faa56e7"
+checksum = "9c198f91728a82281a64e1f4f9eeb25d82cb32a5de251c6bd1b5154d63a8e7bd"
 
 [[package]]
 name = "libsqlite3-sys"
@@ -636,6 +654,7 @@ version = "0.27.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf4e226dcd58b4be396f7bd3c20da8fdee2911400705297ba7d2d7cc2c30f716"
 dependencies = [
+ "cc",
  "pkg-config",
  "vcpkg",
 ]
@@ -686,9 +705,9 @@ dependencies = [
 
 [[package]]
 name = "miniz_oxide"
-version = "0.7.1"
+version = "0.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e7810e0be55b428ada41041c41f32c9f1a42817901b4ccf45fa3d4b6561e74c7"
+checksum = "9d811f3e15f28568be3407c8e7fdb6514c1cda3cb30683f15b6a1a1dc4ea14a7"
 dependencies = [
  "adler",
 ]
@@ -730,9 +749,9 @@ checksum = "c96aba5aa877601bb3f6dd6a63a969e1f82e60646e81e71b14496995e9853c91"
 
 [[package]]
 name = "num-traits"
-version = "0.2.17"
+version = "0.2.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "39e3200413f237f41ab11ad6d161bc7239c84dcb631773ccd7de3dfe4b5c267c"
+checksum = "da0df0e5185db44f69b44f26786fe401b6c293d1907744beaa7fa62b2e5a517a"
 dependencies = [
  "autocfg",
 ]
@@ -869,19 +888,9 @@ checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
 
 [[package]]
 name = "pkg-config"
-version = "0.3.29"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2900ede94e305130c13ddd391e0ab7cbaeb783945ae07a279c268cb05109c6cb"
-
-[[package]]
-name = "pretty_env_logger"
-version = "0.5.0"
+version = "0.3.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "865724d4dbe39d9f3dd3b52b88d859d66bcb2d6a0acfd5ea68a65fb66d4bdc1c"
-dependencies = [
- "env_logger",
- "log",
-]
+checksum = "d231b230927b5e4ad203db57bbcbee2802f6bce620b1e4a9024a07d94e2907ec"
 
 [[package]]
 name = "proc-macro-error"
@@ -943,40 +952,11 @@ dependencies = [
  "bitflags 1.3.2",
 ]
 
-[[package]]
-name = "regex"
-version = "1.10.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b62dbe01f0b06f9d8dc7d49e05a0785f153b00b2c227856282f671e0318c9b15"
-dependencies = [
- "aho-corasick",
- "memchr",
- "regex-automata",
- "regex-syntax",
-]
-
-[[package]]
-name = "regex-automata"
-version = "0.4.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5bb987efffd3c6d0d8f5f89510bb458559eab11e4f869acb20bf845e016259cd"
-dependencies = [
- "aho-corasick",
- "memchr",
- "regex-syntax",
-]
-
-[[package]]
-name = "regex-syntax"
-version = "0.8.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c08c74e62047bb2de4ff487b251e4a92e24f48745648451635cec7d591162d9f"
-
 [[package]]
 name = "reqwest"
-version = "0.11.23"
+version = "0.11.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "37b1ae8d9ac08420c66222fb9096fc5de435c3c48542bc5336c51892cffafb41"
+checksum = "c6920094eb85afde5e4a138be3f2de8bbdf28000f0029e72c45025a56b042251"
 dependencies = [
  "base64",
  "bytes",
@@ -997,9 +977,11 @@ dependencies = [
  "once_cell",
  "percent-encoding",
  "pin-project-lite",
+ "rustls-pemfile",
  "serde",
  "serde_json",
  "serde_urlencoded",
+ "sync_wrapper",
  "system-configuration",
  "tokio",
  "tokio-native-tls",
@@ -1044,9 +1026,9 @@ dependencies = [
 
 [[package]]
 name = "rustix"
-version = "0.38.30"
+version = "0.38.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "322394588aaf33c24007e8bb3238ee3e4c5c09c084ab32bc73890b99ff326bca"
+checksum = "6ea3e1a662af26cd7a3ba09c0297a31af215563ecf42817c98df621387f4e949"
 dependencies = [
  "bitflags 2.4.2",
  "errno",
@@ -1055,6 +1037,15 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
+[[package]]
+name = "rustls-pemfile"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1c74cae0a4cf6ccbbf5f359f08efdf8ee7e1dc532573bf0db71968cb56b1448c"
+dependencies = [
+ "base64",
+]
+
 [[package]]
 name = "ryu"
 version = "1.0.16"
@@ -1127,9 +1118,9 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.112"
+version = "1.0.113"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d1bd37ce2324cf3bf85e5a25f96eb4baf0d5aa6eba43e7ae8958870c4ec48ed"
+checksum = "69801b70b1c3dac963ecb03a364ba0ceda9cf60c71cfe475e99864759c8b8a79"
 dependencies = [
  "itoa",
  "ryu",
@@ -1222,6 +1213,12 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "sync_wrapper"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2047c6ded9c721764247e62cd3b03c09ffc529b2ba5b10ec482ae507a4a70160"
+
 [[package]]
 name = "system-configuration"
 version = "0.5.1"
@@ -1273,6 +1270,7 @@ dependencies = [
  "serde_json",
  "serde_with_macros",
  "teloxide-core",
+ "teloxide-macros",
  "thiserror",
  "tokio",
  "tokio-stream",
@@ -1312,41 +1310,43 @@ dependencies = [
 ]
 
 [[package]]
-name = "tempfile"
-version = "3.9.0"
+name = "teloxide-macros"
+version = "0.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "01ce4141aa927a6d1bd34a041795abd0db1cccba5d5f24b009f694bdf3a1f3fa"
+checksum = "0f1d653b093dba5e44cada57a516f572167df37b8a619443e59c8c517bb6d804"
 dependencies = [
- "cfg-if",
- "fastrand",
- "redox_syscall",
- "rustix",
- "windows-sys 0.52.0",
+ "heck",
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
 ]
 
 [[package]]
-name = "termcolor"
-version = "1.4.1"
+name = "tempfile"
+version = "3.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "06794f8f6c5c898b3275aebefa6b8a1cb24cd2c6c79397ab15774837a0bc5755"
+checksum = "a365e8cd18e44762ef95d87f284f4b5cd04107fec2ff3052bd6a3e6069669e67"
 dependencies = [
- "winapi-util",
+ "cfg-if",
+ "fastrand",
+ "rustix",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
 name = "thiserror"
-version = "1.0.56"
+version = "1.0.57"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d54378c645627613241d077a3a79db965db602882668f9136ac42af9ecb730ad"
+checksum = "1e45bcbe8ed29775f228095caf2cd67af7a4ccf756ebff23a306bf3e8b47b24b"
 dependencies = [
  "thiserror-impl",
 ]
 
 [[package]]
 name = "thiserror-impl"
-version = "1.0.56"
+version = "1.0.57"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fa0faa943b50f3db30a20aa7e265dbc66076993efed8463e8de414e5d06d3471"
+checksum = "a953cb265bef375dae3de6663da4d3804eee9682ea80d8e2542529b73c531c81"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1544,9 +1544,9 @@ checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
 
 [[package]]
 name = "wasm-bindgen"
-version = "0.2.90"
+version = "0.2.91"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b1223296a201415c7fad14792dbefaace9bd52b62d33453ade1c5b5f07555406"
+checksum = "c1e124130aee3fb58c5bdd6b639a0509486b0338acaaae0c84a5124b0f588b7f"
 dependencies = [
  "cfg-if",
  "wasm-bindgen-macro",
@@ -1554,9 +1554,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-backend"
-version = "0.2.90"
+version = "0.2.91"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fcdc935b63408d58a32f8cc9738a0bffd8f05cc7c002086c6ef20b7312ad9dcd"
+checksum = "c9e7e1900c352b609c8488ad12639a311045f40a35491fb69ba8c12f758af70b"
 dependencies = [
  "bumpalo",
  "log",
@@ -1569,9 +1569,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-futures"
-version = "0.4.40"
+version = "0.4.41"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bde2032aeb86bdfaecc8b261eef3cba735cc426c1f3a3416d1e0791be95fc461"
+checksum = "877b9c3f61ceea0e56331985743b13f3d25c406a7098d45180fb5f09bc19ed97"
 dependencies = [
  "cfg-if",
  "js-sys",
@@ -1581,9 +1581,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-macro"
-version = "0.2.90"
+version = "0.2.91"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3e4c238561b2d428924c49815533a8b9121c664599558a5d9ec51f8a1740a999"
+checksum = "b30af9e2d358182b5c7449424f017eba305ed32a7010509ede96cdc4696c46ed"
 dependencies = [
  "quote",
  "wasm-bindgen-macro-support",
@@ -1591,9 +1591,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-macro-support"
-version = "0.2.90"
+version = "0.2.91"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bae1abb6806dc1ad9e560ed242107c0f6c84335f1749dd4e8ddb012ebd5e25a7"
+checksum = "642f325be6301eb8107a83d12a8ac6c1e1c54345a7ef1a9261962dfefda09e66"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1604,15 +1604,15 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-shared"
-version = "0.2.90"
+version = "0.2.91"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d91413b1c31d7539ba5ef2451af3f0b833a005eb27a631cec32bc0635a8602b"
+checksum = "4f186bd2dcf04330886ce82d6f33dd75a7bfcf69ecf5763b89fcde53b6ac9838"
 
 [[package]]
 name = "wasm-streams"
-version = "0.3.0"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b4609d447824375f43e1ffbc051b50ad8f4b3ae8219680c94452ea05eb240ac7"
+checksum = "b65dc4c90b63b118468cf747d8bf3566c1913ef60be765b5730ead9e0a3ba129"
 dependencies = [
  "futures-util",
  "js-sys",
@@ -1623,45 +1623,23 @@ dependencies = [
 
 [[package]]
 name = "web-sys"
-version = "0.3.67"
+version = "0.3.68"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "58cd2333b6e0be7a39605f0e255892fd7418a682d8da8fe042fe25128794d2ed"
+checksum = "96565907687f7aceb35bc5fc03770a8a0471d82e479f25832f54a0e3f4b28446"
 dependencies = [
  "js-sys",
  "wasm-bindgen",
 ]
 
 [[package]]
-name = "winapi"
-version = "0.3.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
-dependencies = [
- "winapi-i686-pc-windows-gnu",
- "winapi-x86_64-pc-windows-gnu",
-]
-
-[[package]]
-name = "winapi-i686-pc-windows-gnu"
-version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
-
-[[package]]
-name = "winapi-util"
-version = "0.1.6"
+name = "windows-core"
+version = "0.52.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f29e6f9198ba0d26b4c9f07dbe6f9ed633e1f3d5b8b414090084349e46a52596"
+checksum = "33ab640c8d7e35bf8ba19b884ba838ceb4fba93a4e8c65a9059d08afcfc683d9"
 dependencies = [
- "winapi",
+ "windows-targets 0.52.0",
 ]
 
-[[package]]
-name = "winapi-x86_64-pc-windows-gnu"
-version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
-
 [[package]]
 name = "windows-sys"
 version = "0.48.0"
diff --git a/Cargo.toml b/Cargo.toml
index e97ef35..8f922fe 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,17 +2,15 @@
 name = "hh"
 version = "0.1.0"
 edition = "2021"
-authors = ["github.com/DmitroPodolsky", "github.com/geekenji"]
-description = "Centralized platform to manage and access your university homework information."
-license = "MIT"
-repository = "github.com/seadclub/hh.git"
 readme = "README.md"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
 log = "0.4.20"
-pretty_env_logger = "0.5.0"
-rusqlite = "0.30.0"
-teloxide = "0.12.2"
+rusqlite = { version = "0.30.0", features = ["bundled"] }
+teloxide = { version = "0.12.2", features = ["macros"] }
 tokio = { version = "1.36.0", features = ["full"] }
+dotenv = "0.15.0"
+thiserror = "1.0.56"
+chrono = "0.4.34"
diff --git a/src/commands.rs b/src/commands.rs
new file mode 100644
index 0000000..f3b28db
--- /dev/null
+++ b/src/commands.rs
@@ -0,0 +1,43 @@
+use crate::models::{State, Command};
+use crate::telegram::basic_methods::*;
+use teloxide::dispatching::dialogue::InMemStorage;
+use teloxide::dispatching::{dialogue, DpHandlerDescription};
+use teloxide::dptree;
+use teloxide::dptree::{case, Handler};
+use teloxide::prelude::*;
+
+
+pub fn schema() -> Handler<'static, DependencyMap, crate::errors::Result<()>, DpHandlerDescription>
+{
+    let command_handler = teloxide::filter_command::<Command, _>()
+        .branch(
+            case![State::Start]
+                .branch(case![Command::Help].endpoint(help))
+                .branch(case![Command::Add].endpoint(add)),
+        )
+        .branch(case![Command::Cancel].endpoint(cancel));
+
+    let callback_query_handler = Update::filter_callback_query().branch(
+            case![State::ReceiveProductChoice].endpoint(receive_add_button),
+        );
+
+    // let callback_query_handler = Update::filter_message()
+    //     .branch(case![State::GetEmail { phone_number }].endpoint(get_email))
+    //     .branch(case![State::GetAge { phone_number }].endpoint(get_age))
+    //     .branch(case![State::GetWeightAndHeight { phone_number }].endpoint(get_height_and_weight));
+
+    let message_handler = Update::filter_message()
+        .branch(command_handler)
+        // .branch(case![State::GetPhoneNumber].endpoint(get_number))
+        // .branch(case![State::HomeTrainingMenu { phone_number }].endpoint(home_training_menu))
+        // .branch(case![State::GymTrainingMenu { phone_number }].endpoint(gym_training_menu))
+        .branch(case![State::CreateCategorie].endpoint(send_categorie))
+        .branch(case![State::AddTaskName { categorie }].endpoint(send_taskname))
+        .branch(case![State::AddDescription { categorie, taskname }].endpoint(send_description))
+        .branch(case![State::CreateTask { categorie, taskname, description }].endpoint(send_deadline))
+        .branch(dptree::endpoint(invalid_state));
+
+
+    dialogue::enter::<Update, InMemStorage<State>, State, _>().branch(message_handler).branch(callback_query_handler)
+    //State::Start - initial state
+}
\ No newline at end of file
diff --git a/src/db.rs b/src/db.rs
index 0474038..920e54b 100644
--- a/src/db.rs
+++ b/src/db.rs
@@ -1,4 +1,6 @@
-use rusqlite::Connection;
+use rusqlite::{Connection, Error};
+
+use crate::models::MyDialogue;
 
 pub fn create_db() {
     let conn = Connection::open("your_database.db").expect("Failed to open database");
@@ -33,4 +35,71 @@ pub fn create_db() {
     ).expect("Failed to create homework_hub table");
 
     log::info!("created database successfully!");
-}
\ No newline at end of file
+}
+
+pub fn select_all_categories() -> Result<Vec<String>, Error> {
+    let conn = Connection::open("your_database.db")?;
+
+    let mut stmt = conn.prepare("SELECT name FROM category")?;
+
+    let category_iter = stmt.query_map([], |row| {
+        Ok(row.get(0)?)
+    })?;
+
+    let mut categories = Vec::new();
+
+    for name in category_iter {
+        categories.push(name?);
+    }
+
+    Ok(categories)
+}
+
+pub fn insert_user(msg: MyDialogue) -> Result<(), Error> {
+    let conn = Connection::open("your_database.db")?;
+
+    let mut stmt = conn.prepare("SELECT COUNT(*) FROM users WHERE id = ?")?;
+    let user_exists: i64 = stmt.query_row([msg.chat_id().to_string()], |row| row.get(0))?;
+
+    if user_exists == 0 {
+        conn.execute("INSERT INTO users(id) VALUES (?)", [&msg.chat_id().to_string()])?;
+    } else {
+
+    }
+
+    Ok(())
+}
+
+pub fn insert_category(name: &str) -> Result<(), Error> {
+    let conn = Connection::open("your_database.db")?;
+
+    conn.execute(
+        "INSERT INTO category (name) VALUES (?)",
+        &[name],
+    )?;
+
+    Ok(())
+}
+
+pub fn select_categorie(name: &str) -> Result<i32, Error> {
+    let conn = Connection::open("your_database.db")?;
+
+    let category_id: i32 = conn.query_row(
+        "SELECT id FROM category WHERE name = ?",
+        &[name],
+        |row| row.get(0)
+    )?;
+
+    Ok(category_id)
+}
+
+pub fn insert_homework(name: &str, desc: &str, deadline: &str, category_id: &i32, msg: MyDialogue) -> Result<(), Error> {
+    let conn = Connection::open("your_database.db")?;
+
+    conn.execute(
+        "INSERT INTO homework_hub (name, desc, deadline, category_id, user_id) VALUES (?, ?, ?, ?, ?)",
+        &[name, desc, deadline, &category_id.to_string(), &msg.chat_id().to_string()],
+    )?;
+
+    Ok(())
+}
diff --git a/src/errors.rs b/src/errors.rs
new file mode 100644
index 0000000..8fb7ae4
--- /dev/null
+++ b/src/errors.rs
@@ -0,0 +1,18 @@
+#[allow(clippy::enum_variant_names)]
+#[derive(Debug, thiserror::Error)]
+pub enum Errors {
+    #[error(transparent)]
+    EnvError(#[from] dotenv::Error),
+
+    #[error(transparent)]
+    TeloxideError(#[from] teloxide::RequestError),
+
+    #[error(transparent)]
+    InMemStorageError(#[from] teloxide::dispatching::dialogue::InMemStorageError),
+
+
+    #[error(transparent)]
+    ParseIntError(#[from] std::num::ParseIntError),
+}
+
+pub type Result<T> = std::result::Result<T, Errors>;
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
index c42a9c0..c62e65a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,32 +1,35 @@
-pub mod bot;
+pub mod telegram;
 pub mod db;
-
+use crate::errors::Result;
+use crate::commands::schema;
+use crate::models::State;
+use dotenv::dotenv;
+use std::sync::Arc;
 use db::create_db;
-use bot::*;
-use teloxide::{dispatching::dialogue::InMemStorage, prelude::*};
+use teloxide::dispatching::dialogue::InMemStorage;
+use teloxide::prelude::*;
+
+mod models;
+mod commands;
+mod errors;
 
 #[tokio::main]
-async fn main() {
+async fn main() -> Result<()> {
+    dotenv().ok();
     log::info!("Starting dialogue bot...");
     create_db();
-    pretty_env_logger::init();
 
-    let bot = Bot::from_env();
+    let bot = Bot::new(dotenv::var("TELOXIDE_TOKEN")?);
+    let state = Arc::new(State::Start);
 
-    Dispatcher::builder(
-        bot,
-        Update::filter_message()
-            .enter_dialogue::<Message, InMemStorage<State>, State>()
-            .branch(dptree::case![State::Start].endpoint(start))
-            .branch(dptree::case![State::ReceiveFullName].endpoint(receive_full_name))
-            .branch(dptree::case![State::ReceiveAge { full_name }].endpoint(receive_age))
-            .branch(
-                dptree::case![State::ReceiveLocation { full_name, age }].endpoint(receive_location),
-            ),
-    )
-    .dependencies(dptree::deps![InMemStorage::<State>::new()])
+    Dispatcher::builder(bot, schema())
+    .dependencies(dptree::deps![
+        InMemStorage::<State>::new(),
+        Arc::clone(&state)
+    ])
     .enable_ctrlc_handler()
     .build()
     .dispatch()
     .await;
+    Ok(())
 }
diff --git a/src/models.rs b/src/models.rs
index e69de29..5f90a16 100644
--- a/src/models.rs
+++ b/src/models.rs
@@ -0,0 +1,32 @@
+
+use teloxide::dispatching::dialogue::InMemStorage;
+use teloxide::prelude::Dialogue;
+use teloxide::utils::command::BotCommands;
+
+pub type MyDialogue = Dialogue<State, InMemStorage<State>>;
+
+/// These commands are supported:
+#[derive(BotCommands, Clone)]
+#[command(
+    rename_rule = "lowercase",
+    description = "These commands are supported:"
+)]
+pub enum Command {
+    #[command(description = "display this text.")]
+    Help,
+    #[command(description = "cancel the purchase procedure.")]
+    Cancel,
+    #[command(description = "create new hometask")]
+    Add,
+}
+
+#[derive(Clone, Default)]
+pub enum State {
+    #[default]
+    Start,
+    ReceiveProductChoice,
+    CreateCategorie,
+    AddTaskName { categorie: String },
+    AddDescription { categorie: String, taskname: String },
+    CreateTask { categorie: String, taskname: String, description: String },
+}
diff --git a/src/telegram/basic_methods.rs b/src/telegram/basic_methods.rs
new file mode 100644
index 0000000..2a87e7b
--- /dev/null
+++ b/src/telegram/basic_methods.rs
@@ -0,0 +1,214 @@
+
+use crate::models::Command;
+use crate::models::{MyDialogue, State};
+use crate::db::{select_all_categories, insert_category, select_categorie, insert_homework, insert_user};
+use teloxide::prelude::*;
+use teloxide::requests::Requester;
+use teloxide::types::{InlineKeyboardButton, InlineKeyboardMarkup};
+use teloxide::utils::command::BotCommands;
+use chrono::NaiveDate;
+// use crate::utils::check_deadline; // Commented out as it's causing an error
+use teloxide::Bot;
+
+pub async fn help(bot: Bot, msg: Message) -> crate::errors::Result<()> {
+    bot.send_message(msg.chat.id, Command::descriptions().to_string())
+        .await?;
+    Ok(())
+}
+
+pub async fn cancel(bot: Bot, dialogue: MyDialogue, msg: Message) -> crate::errors::Result<()> {
+    bot.send_message(msg.chat.id, "Cancelling the dialogue.")
+        .await?;
+    dialogue.exit().await?;
+    Ok(())
+}
+
+pub async fn invalid_state(bot: Bot, msg: Message) -> crate::errors::Result<()> {
+    bot.send_message(
+        msg.chat.id,
+        "Я тебе не розумію, подивись будь-ласка на команду /help",
+    )
+    .await?;
+    Ok(())
+}
+
+pub async fn add(bot: Bot, dialogue: MyDialogue, msg: Message) -> crate::errors::Result<()> {
+    let categories = select_all_categories().unwrap();
+    let create_row =  InlineKeyboardButton::callback("create categorie", "create");
+    let mut products = categories
+        .iter()
+        .map(|product| vec![InlineKeyboardButton::callback(product.to_string(), product.to_string())])
+        .collect::<Vec<_>>();
+
+
+    if categories.len() <= 4 {
+        products.push(vec![create_row]);
+        bot.send_message(msg.chat.id, "Select a product:")
+            .reply_markup(InlineKeyboardMarkup::new(products))
+            .await?;
+        
+        dialogue.update(State::ReceiveProductChoice).await?;
+        return Ok(());
+    } else {
+        let mut products = categories[..4]
+            .iter()
+            .map(|product| vec![InlineKeyboardButton::callback(product.to_string(), product.to_string())])
+            .collect::<Vec<_>>();
+
+        let additional_row = ["next"]
+            .iter()
+            .map(|&product| InlineKeyboardButton::callback(product.to_string(), "next_2"))
+            .collect();
+
+        products.push(additional_row);
+        products.push(vec![create_row]);
+
+        bot.send_message(msg.chat.id, "Select a product:")
+            .reply_markup(InlineKeyboardMarkup::new(products))
+            .await?;
+        
+        dialogue.update(State::ReceiveProductChoice).await?;
+    }
+
+    // let additional_row = ["next", "previous"]
+    //     .iter()
+    //     .map(|&product| InlineKeyboardButton::callback(product.to_string(), product.to_string()))
+    //     .collect();
+    Ok(())
+}
+
+pub async fn receive_add_button(
+    bot: Bot,
+    dialogue: MyDialogue,
+    q: CallbackQuery,
+) -> crate::errors::Result<()> {
+    insert_user(dialogue.clone()).unwrap();
+    if let Some(product) = &q.data {
+        if product == "create" {
+            bot.send_message(
+                dialogue.chat_id(),
+                "Enter the name of the new product:",
+            )
+            .await?;
+            dialogue.update(State::CreateCategorie).await?;
+        } else if product.starts_with("next") || product.starts_with("previous") {
+            let page = product.chars().last().unwrap().to_digit(10).unwrap() as usize;
+            let create_row =  InlineKeyboardButton::callback("create categorie", "create");
+            let mut products = pages(page);
+            products.push(vec![create_row]);
+            bot.send_message(
+                dialogue.chat_id(),
+                "Select a product:",
+            )
+            .reply_markup(InlineKeyboardMarkup::new(products))
+            .await?;
+        } else {
+            bot.send_message(
+                dialogue.chat_id(),
+                "send task name:",
+            )
+            .await?;
+            dialogue.update(State::AddTaskName { categorie: product.to_string() }).await?;
+        }
+    }
+
+    Ok(())
+}
+
+
+pub async fn send_categorie(bot: Bot, dialogue: MyDialogue, msg: Message) -> crate::errors::Result<()> {
+    insert_category(&msg.text().unwrap()).unwrap();
+    bot.send_message(
+        dialogue.chat_id(),
+        "send task name:",
+    )
+    .await?;
+    dialogue.update(State::AddTaskName { categorie: msg.text().unwrap().to_string() }).await?;
+
+    Ok(())
+}
+
+pub async fn send_taskname(bot: Bot, dialogue: MyDialogue, msg: Message, categorie: String) -> crate::errors::Result<()> {
+    bot.send_message(
+        dialogue.chat_id(),
+        "send description:",
+    )
+    .await?;
+    dialogue.update(State::AddDescription { categorie: categorie, taskname: msg.text().unwrap().to_string() }).await?;
+    Ok(())
+}
+
+pub async fn send_description(bot: Bot, dialogue: MyDialogue, msg: Message, (categorie, taskname) : (String, String)) -> crate::errors::Result<()> {
+    bot.send_message(
+        dialogue.chat_id(),
+        "send deadline(example: 2023-04-12):",
+    )
+    .await?;
+    dialogue.update(State::CreateTask { categorie: categorie, taskname: taskname, description: msg.text().unwrap().to_string() }).await?;
+    Ok(())
+}
+
+pub async fn send_deadline(bot: Bot, dialogue: MyDialogue, msg: Message, (categorie, taskname, description) : (String, String, String)) -> crate::errors::Result<()> {
+    if check_deadline(&msg.text().unwrap()) {
+        insert_homework(&taskname, &description, &msg.text().unwrap(), &select_categorie(&categorie).unwrap(), dialogue.clone()).unwrap();
+        bot.send_message(
+            dialogue.chat_id(),
+            "Task has been created successfully!",
+        )
+        .await?;
+        dialogue.exit().await?;
+    } else {
+        bot.send_message(
+            dialogue.chat_id(),
+            "Invalid deadline format. Please enter the deadline in the format: YYYY-MM-DD",
+        )
+        .await?;
+    }
+    Ok(())
+}
+
+pub fn check_deadline(deadline: &str) -> bool {
+    let date = NaiveDate::parse_from_str(deadline, "%Y-%m-%d");
+    match date {
+        Ok(_) => true,
+        Err(_) => false,
+    }
+}
+
+pub fn pages(page: usize) -> Vec<Vec<InlineKeyboardButton>> {
+    let categories = select_all_categories().unwrap();
+    let additional_row: Vec<InlineKeyboardButton> = ["next", "previous"]
+        .iter()
+        .map(|&product| {
+            let callback_data = match product {
+                "next" => format!("next_{}", page + 1),
+                "previous" => format!("previous_{}", page - 1),
+                _ => panic!("Unknown product type"),
+            };
+            InlineKeyboardButton::callback(product.to_string(), callback_data)
+        })
+        .collect();
+
+    if categories.len() <= page * 4 {
+        let mut products = categories[((page - 1) * 4)..]
+            .iter()
+            .map(|product| vec![InlineKeyboardButton::callback(product.to_string(), product.to_string())])
+            .collect::<Vec<_>>();
+        products.push(vec![additional_row[1].clone()]);
+        return products;
+    } else if page == 1 {
+        let mut products = categories[..4]
+            .iter()
+            .map(|product| vec![InlineKeyboardButton::callback(product.to_string(), product.to_string())])
+            .collect::<Vec<_>>();
+        products.push(vec![additional_row[0].clone()]);
+        return products;
+    } else {
+        let mut products = categories[((page - 1) * 4)..(page * 4)]
+            .iter()
+            .map(|product| vec![InlineKeyboardButton::callback(product.to_string(), product.to_string())])
+            .collect::<Vec<_>>();
+        products.push(additional_row);
+        return products;
+    }
+}
diff --git a/src/telegram/mod.rs b/src/telegram/mod.rs
index e69de29..e679bea 100644
--- a/src/telegram/mod.rs
+++ b/src/telegram/mod.rs
@@ -0,0 +1 @@
+pub mod basic_methods;
\ No newline at end of file