using System;
using System.Collections.Generic;
using System.Text.Json;
using System.IO;
using System.Text.RegularExpressions;

namespace wikicreachia {
	class Program {
		static void Main(string[] args) {
			(string major, int minor) status = ("base", 0);
			var creachers = new Dictionary<string, Creacher>();
			var userCreacher = new Dictionary<string, object>();
			string prompt = "";
			string input;
			string inputLower;
			bool readKey;
			Regex inputTrimmer = new Regex(@" *(.+) *");

			if (File.Exists("wikicreachia.json")) {
				using (var sr = new StreamReader("wikicreachia.json")) {
					creachers = JsonSerializer.Deserialize<Dictionary<string, Creacher>>(sr.ReadToEnd());
				}
			}

			while (true) {
				readKey = false;
				switch (status.major) {
					case "base":
						prompt = "Welcome to Wikicreachia! Type 'help' for help, or 'q' to quit.";
						break;

					case "add":
						if (status.minor <= 2) {
							string[] prompts = {
							"Input the name of your creacher, or 'c' to cancel.",
							"Input the desired number of footsies (number).",
							"Input the biome your creacher inhabits most often (freeform text).",
						};
							prompt = prompts[status.minor];
						}

						else if (status.minor == 3) {
							prompt = "Press the number corresponding to your creacher's primary method of locomotion:";
							foreach (Locomotion option in Enum.GetValues(typeof(Locomotion))) {
								prompt += $"\n{(int)option + 1}. {option}";
							}
							readKey = true;
						}

						else if (status.minor == 4) {
							prompt = "Press the number corresponding to the elevation level your creacher is usually found at:\n1. Below sea level\n2. At sea level\n3. Above sea level";
							readKey = true;
						}
						break;

					default:
						prompt = $"Unknown status {status.major}!";
						break;
				}

				Console.Write($"\n{prompt}\n> ");
				if (readKey) {
					input = Console.ReadKey().KeyChar.ToString();
					Console.WriteLine(); // insert a newline after the character
				}
				else {
					input = Console.ReadLine();
					if (input.Length > 0) {
						input = inputTrimmer.Match(input).Groups[1].Value; // trim leading/traling whitespace
					}
				}

				inputLower = input.ToLower();

				// general cases - commands that can be used at any time, such as "quit"
				if (String.IsNullOrWhiteSpace(input)) {
					Console.WriteLine("I can't hear you!");
					continue;
				}
				if (inputLower == "q" || inputLower == "quit") {
					Console.WriteLine("Thanks for using WikiCreachia!");
					using (var sw = new StreamWriter("wikicreachia.json")) {
						sw.Write(JsonSerializer.Serialize(creachers));
					}
					return;
				}
				else if (new List<string> { "h", "help", "?" }.Contains(inputLower)) {
					Console.WriteLine("WikiCreachia is a program for creating and viewing info about creachers.");
					Console.WriteLine("To add a new creacher, type 'add'.");
					Console.WriteLine("To view info about a creacher, type its name.");
					Console.WriteLine("To see the list of creachers, type 'list'.");
					Console.WriteLine();
					continue;
				}

				// specific cases - commands that depend on status.major

				if (status.major == "base") {
					if (input == "add") {
						status.major = "add";
						continue;
					}
					else if (input == "list") {
						if (creachers.Count == 0) {
							Console.WriteLine("We don't have even a single creacher! 0uo\nWhy not crete one?");
						}
						else {
							Console.WriteLine("Here comes the creacher parade!");
							foreach (Creacher entry in creachers.Values) {
								Console.WriteLine(entry);
							}
						}
					}

					else if (creachers.ContainsKey(input)) {
						Console.WriteLine(creachers[input]);
					}

					else {
						Console.WriteLine($"I don't have any info on \"{input}\".");
					}
				}

				else if (status.major == "add") {
					if (input == "c") {
						Console.WriteLine("Creacher creation cancelled.");
						status.major = "base";
						continue;
					}

					if (status.minor == 0) {
						if (creachers.ContainsKey(input)) {
							Console.WriteLine("Such a creacher already exists! 0uo");
						}
						else {
							// create new dict to ensure all values are empty
							userCreacher = new Dictionary<string, object>();
							userCreacher["name"] = input;
							status.minor++;
						}
					}

					else if (status.minor == 1) {
						if (int.TryParse(input, out int footsies) && footsies >= 0) {
							userCreacher["footsies"] = footsies;
							status.minor++;
						}
						else {
							Console.WriteLine("Please enter a valid number.");
						}
					}

					else if (status.minor == 2) {
						userCreacher["biome"] = input;
						status.minor++;
					}

					else if (status.minor == 3) {
						if (int.TryParse(input, out int choice) && Enum.IsDefined(typeof(Locomotion), choice - 1)) {
							userCreacher["locomotion"] = (Locomotion)choice - 1;
							status.minor++;
						}
						else {
							Console.WriteLine("Invalid choice - please try again.");
						}
					}

					else if (status.minor == 4) {
						if (int.TryParse(input, out int choice) && Enum.IsDefined(typeof(RelativeElevation), choice - 1)) {
							userCreacher["elevation"] = (RelativeElevation)choice - 1;

							// try to create the new creacher
							creachers.Add(
								(string)userCreacher["name"], new Creacher(
									(string)userCreacher["name"],
									(int)userCreacher["footsies"],
									(string)userCreacher["biome"],
									(Locomotion)userCreacher["locomotion"],
									(RelativeElevation)userCreacher["elevation"]
								)
							);

							Console.WriteLine("Added {0}!", userCreacher["name"]);
							using (var sw = new StreamWriter("wikicreachia.json")) {
								sw.Write(JsonSerializer.Serialize(creachers));
							}
							status.major = "base";
							status.minor = 0;

						}
						else {
							Console.WriteLine("Invalid choice - please try again.");
						}
					}
				}
			}
		}
	}
}