import { assert } from "./assert.ts";
import {
	LEVEL_NAMES,
	GraduationChange,
	fetchGraduation,
	submitGraduationChange,
	deleteGraduationChange,
} from "./graduation-ENV.ts";

import { fetchStudent, fetchStudents } from "./student-ENV.ts";
import { getName, DATETIME_FMT } from "./utils-ENV.js";
import { initSelection } from "./selection.js";

let name;
let student;

async function loadStudent(studentToLoad) {
	student = studentToLoad;
	await fetchAndUpdateStudentInfo();
	// updateStudentCalendar();
	// updateStudentProgress();
	updateStudentGraduation();
}

function initStudentSelection() {
	initSelection(
		"student-selection",
		fetchStudents,
		(student) => `${student.name} ${student.getGroup()}`,
		loadStudent,
	);
}

function pointClickHandler(color) {
	const textareaDiv = document.getElementById("student-info-point-reason-container");
	const textarea = document.getElementById("student-info-point-reason");
	const submitBtn = document.getElementById("student-info-point-reason-submit");

	// TODO(muhq): Prefill the textarea with common reasons
	switch (color) {
		case "green":
			textarea.style.background = "rgb(from green r g b / 20%)";
			textarea.value = "";
			break;
		case "orange":
			textarea.style.background = "rgb(from orange r g b / 20%)";
			textarea.value = "";
			break;
		case "red":
			textarea.style.background = "rgb(from red r g b / 20%)";
			textarea.value = "";
			break;
	}
	textareaDiv.style.display = "block";
	textarea.focus();

	const coach = name;

	const submit = function () {
		let change;
		switch (color) {
			case "green":
				change = GraduationChange.newGreenPointChange(false, textarea.value, coach);
				break;
			case "orange":
				change = GraduationChange.newOrangePointChange(false, textarea.value, coach);
				break;
			case "red":
				change = GraduationChange.newRedPointChange(false, textarea.value, coach);
				break;
			default:
				throw new Error("Invalid color");
		}
		submitGraduationChange(change, student.graduation);
		textareaDiv.style.display = "none";
		updateStudentInfo();
		fetchGraduation(student).then(() => updateStudentGraduation());
	};
	// Use onEVENT to override any previous handler
	textarea.onkeydown = function (e) {
		if (e.shiftKey && e.key === "Enter") {
			submit();
		}
		if (e.key === "Escape") {
			textareaDiv.style.display = "none";
		}
	};
	submitBtn.onclick = submit;
}

async function fetchAndUpdateStudentInfo() {
	student.graduation = await fetchGraduation(student);
	updateStudentInfo();
}

let DEFAULT_STUDENT_ICON;

function updateStudentInfo() {
	// Reset the student icon
	document.getElementById("student-info-icon").src = DEFAULT_STUDENT_ICON;

	// Try to replace the generic icon with the user's icon
	var img = document.createElement("img");
	img.onload = function () {
		document.getElementById("student-info-icon").src = img.src;
		img = img.onload = null;
	};
	student.getIconUrl().then((url) => (img.src = url));

	document.getElementById("student-info-name").innerHTML = `${student.name}`;

	if (student.graduation) {
		const tag = document.getElementById("student-info-tag");
		tag.innerHTML = student.graduation.getLevelName();
		tag.style.display = "block";

		document.getElementById("student-info-points-green").innerHTML = student.graduation.green;
		document.getElementById("student-info-points-orange").innerHTML = student.graduation.orange;
		document.getElementById("student-info-points-red").innerHTML = student.graduation.red;
		document.getElementById("student-info-points-sum").innerHTML =
			student.graduation.getNettoPoints();

		document
			.getElementById("student-info-green")
			.addEventListener("click", () => pointClickHandler("green"));
		document
			.getElementById("student-info-orange")
			.addEventListener("click", () => pointClickHandler("orange"));
		document
			.getElementById("student-info-red")
			.addEventListener("click", () => pointClickHandler("red"));

		const icon = document.getElementById("student-level-icon");
		icon.src = student.graduation.getIcon();

		document.getElementById("student-info-coach").innerHTML = student.graduation.coaches[0] ?? "";
	}

	document.getElementById("student-content").style.display = "block";
}

async function updateStudentGraduation() {
	assert(student.graduation, "Student has no graduation");
	const graduation = student.graduation;

	// Only the coach is allowed to graduate
	if (student.graduation.coaches.includes(name)) {
		document.getElementById("graduation-level-change").style.display = "block";
		const levelChangeLvl = document.getElementById("graduation-level-change-level");
		levelChangeLvl.value = Math.min(graduation.level + 1, 4);

		const levelChangeBtn = document.getElementById("graduation-level-change-submit");
		levelChangeBtn.onclick = () => {
			const change = GraduationChange.newLevelChange(Number(levelChangeLvl.value), "", name);
			submitGraduationChange(change, student.graduation);
			updateStudentInfo();
			updateStudentGraduation();
		};
	} else {
		document.getElementById("graduation-level-change").style.display = "hidden";
	}

	const changesTbl = document.getElementById("graduation-changes");
	changesTbl.innerHTML = "";
	for (const change of graduation.changes) {
		const changeTr = document.createElement("tr");

		switch (change.change) {
			case "Grün":
				changeTr.style.background = "rgb(from green r g b / 50%)";
				break;
			case "Rot":
				changeTr.style.background = "rgb(from red r g b / 50%)";
				break;
			case "Orange":
				changeTr.style.background = "rgb(from orange r g b / 50%)";
				break;
		}

		const tds = [];
		const addTd = (s) => {
			const changeTd = document.createElement("td");
			changeTd.innerHTML = s;
			changeTr.appendChild(changeTd);
			tds.push(changeTd);
		};

		addTd(change.change);
		addTd(DATETIME_FMT.format(change.date));
		addTd(change.reason);
		addTd(change.coach);
		let ctxFmt = "";
		switch (change.change) {
			case "CoachZuweisung":
				ctxFmt = change.context.zuweisungen[student.id];
				break;
			case "LevelÄnderung":
				ctxFmt = LEVEL_NAMES[change.context.level];
				break;
			case "Grün":
			case "Orange":
			case "Rot":
				ctxFmt = change.context.mandatory ? "erforderlich" : "";
				break;
			default:
				ctxFmt = JSON.stringify(change.context);
				break;
		}
		addTd(ctxFmt);

		if (change.coach === name) {
			const delBtn = document.createElement("button");
			delBtn.innerHTML = "Löschen";

			delBtn.addEventListener("click", () => {
				const state = document.createElement("span");
				state.classList.add("graduation-delete-state");

				const inprogress = document.createElement("span");
				inprogress.classList.add("graduation-delete-inprogress");
				state.appendChild(inprogress);

				delBtn.replaceWith(state);
				deleteGraduationChange(graduation, change)
					.then(() => {
						updateStudentInfo();
						state.style.display = "inline";
						state.innerHTML = "✓";
						for (const td of tds) {
							td.style["text-decoration"] = "line-through";
						}
					})
					.catch(() => {
						state.style.display = "inline";
						state.innerHTML = "X";
					})
					.finally(() => {
						inprogress.remove();
					});
			});
			changeTr.appendChild(delBtn);
		}

		changesTbl.appendChild(changeTr);
	}
}

async function initCockpit() {
	initStudentSelection();
	const params = new URLSearchParams(location.search);
	const userId = params.get("userToLoad");
	if (userId) {
		student = await fetchStudent(userId);
		await loadStudent(student);
	}
}

window.onload = function () {
	DEFAULT_STUDENT_ICON = document.getElementById("student-info-icon").src;
	name = getName();
	initCockpit();
};