import { ItemView, WorkspaceLeaf, Modal, App, Setting } from "obsidian";
import TaskWeaverPlugin from "./main";
import { Task, Category } from "./types";
import { formatDuration, generateUniqueId } from "./utils";

export const VIEW_TYPE_TASKWEAVER = "taskweaver-view";

export class TaskWeaverView extends ItemView {
	plugin: TaskWeaverPlugin;
	private updateInterval: number | null = null;

	constructor(leaf: WorkspaceLeaf, plugin: TaskWeaverPlugin) {
		super(leaf);
		this.plugin = plugin;
	}

	getViewType(): string {
		return VIEW_TYPE_TASKWEAVER;
	}

	getDisplayText(): string {
		return "TaskWeaver";
	}

	getIcon(): string {
		return "clock";
	}

	async onOpen(): Promise<void> {
		this.render();
		this.updateInterval = window.setInterval(() => {
			this.updateTimers();
		}, 1000);
	}

	async onClose(): Promise<void> {
		if (this.updateInterval !== null) {
			window.clearInterval(this.updateInterval);
		}
	}

	render(): void {
		const container = this.containerEl.children[1] as HTMLElement;
		container.empty();
		container.addClass("taskweaver-container");

		const headerDiv = container.createDiv({ cls: "taskweaver-header" });
		headerDiv.createEl("h4", { text: "TaskWeaver" });

		const buttonContainer = headerDiv.createDiv({ cls: "taskweaver-button-group" });

		const addTaskBtn = buttonContainer.createEl("button", {
			text: "Add Task",
			cls: "taskweaver-btn"
		});
		addTaskBtn.onclick = () => this.openAddTaskModal();

		const manageCategoriesBtn = buttonContainer.createEl("button", {
			text: "Categories",
			cls: "taskweaver-btn"
		});
		manageCategoriesBtn.onclick = () => this.openManageCategoriesModal();

		const categoriesMap = new Map(this.plugin.settings.categories.map(c => [c.id, c]));

		const activeTask = this.plugin.settings.tasks.find(t => t.startTime !== null);
		if (activeTask) {
			const category = categoriesMap.get(activeTask.categoryId);
			this.renderActiveTimer(container, activeTask, category);
		}

		this.plugin.settings.categories.forEach(category => {
			const categoryTasks = this.plugin.settings.tasks.filter(t => t.categoryId === category.id && !t.completed);

			if (categoryTasks.length > 0) {
				this.renderCategory(container, category, categoryTasks);
			}
		});

		const completedTasks = this.plugin.settings.tasks.filter(t => t.completed);
		if (completedTasks.length > 0) {
			const completedSection = container.createDiv({ cls: "taskweaver-category" });
			const completedHeader = completedSection.createDiv({ cls: "taskweaver-category-header" });
			completedHeader.createEl("span", { text: "✓ Completed", cls: "taskweaver-category-name" });

			completedTasks.forEach(task => {
				const category = categoriesMap.get(task.categoryId);
				this.renderTask(completedSection, task, category);
			});
		}
	}

	renderActiveTimer(container: HTMLElement, task: Task, category?: Category): void {
		const timerSection = container.createDiv({ cls: "taskweaver-active-timer" });

		if (category) {
			timerSection.style.borderColor = category.color;
		}

		const timerHeader = timerSection.createDiv({ cls: "taskweaver-active-timer-header" });
		timerHeader.createEl("span", { text: "Active Task", cls: "taskweaver-active-timer-label" });

		const taskTitleDiv = timerSection.createDiv({ cls: "taskweaver-active-timer-title" });
		if (category?.emoji) {
			taskTitleDiv.createSpan({ text: `${category.emoji} `, cls: "taskweaver-emoji" });
		}
		taskTitleDiv.createSpan({ text: task.title });

		const timerDisplay = timerSection.createDiv({
			cls: "taskweaver-active-timer-display",
			attr: { "data-task-id": task.id }
		});
		timerDisplay.setText(formatDuration(this.plugin.getTaskElapsed(task)));

		const timerControls = timerSection.createDiv({ cls: "taskweaver-active-timer-controls" });

		const pauseBtn = timerControls.createEl("button", {
			text: "Pause",
			cls: "taskweaver-timer-control-btn pause"
		});
		pauseBtn.onclick = async () => {
			await this.plugin.toggleTaskTimer(task.id);
		};

		const stopBtn = timerControls.createEl("button", {
			text: "Stop",
			cls: "taskweaver-timer-control-btn stop"
		});
		stopBtn.onclick = async () => {
			await this.plugin.stopTaskTimer(task.id);
		};

		const completeBtn = timerControls.createEl("button", {
			text: "Complete",
			cls: "taskweaver-timer-control-btn complete"
		});
		completeBtn.onclick = async () => {
			await this.plugin.toggleTaskComplete(task.id);
		};
	}

	renderCategory(container: HTMLElement, category: Category, tasks: Task[]): void {
		const categoryDiv = container.createDiv({ cls: "taskweaver-category" });

		const categoryHeader = categoryDiv.createDiv({ cls: "taskweaver-category-header" });
		categoryHeader.style.borderLeftColor = category.color;

		const categoryName = categoryHeader.createSpan({ cls: "taskweaver-category-name" });
		if (category.emoji) {
			categoryName.createSpan({ text: `${category.emoji} `, cls: "taskweaver-emoji" });
		}
		categoryName.createSpan({ text: category.name });

		tasks.forEach(task => {
			this.renderTask(categoryDiv, task, category);
		});
	}

	renderTask(container: HTMLElement, task: Task, category?: Category): void {
		const taskDiv = container.createDiv({ cls: "taskweaver-task" });

		if (task.startTime) {
			taskDiv.addClass("taskweaver-task-running");
		}

		const taskInfo = taskDiv.createDiv({ cls: "taskweaver-task-info" });

		const taskTitle = taskInfo.createSpan({
			text: task.title,
			cls: task.completed ? "taskweaver-task-title taskweaver-task-completed" : "taskweaver-task-title"
		});

		const taskControls = taskDiv.createDiv({ cls: "taskweaver-task-controls" });

		const timerSpan = taskControls.createSpan({
			cls: "taskweaver-timer-small",
			attr: { "data-task-id": task.id }
		});
		timerSpan.setText(formatDuration(this.plugin.getTaskElapsed(task)));

		if (!task.completed) {
			if (!task.startTime) {
				const startBtn = taskControls.createEl("button", {
					text: "Start",
					cls: "taskweaver-start-btn"
				});
				startBtn.onclick = async () => {
					await this.plugin.toggleTaskTimer(task.id);
				};
			}

			const deleteBtn = taskControls.createEl("button", {
				text: "Delete",
				cls: "taskweaver-delete-btn"
			});
			deleteBtn.onclick = async () => {
				await this.plugin.deleteTask(task.id);
			};
		} else {
			const checkbox = taskControls.createEl("input", { type: "checkbox" });
			checkbox.checked = true;
			checkbox.addClass("taskweaver-checkbox");
			checkbox.onclick = async () => {
				await this.plugin.toggleTaskComplete(task.id);
			};
		}
	}

	updateTimers(): void {
		const container = this.containerEl.children[1] as HTMLElement;

		const activeTimerDisplay = container.querySelector(".taskweaver-active-timer-display");
		if (activeTimerDisplay) {
			const taskId = activeTimerDisplay.getAttribute("data-task-id");
			if (taskId) {
				const task = this.plugin.settings.tasks.find(t => t.id === taskId);
				if (task) {
					activeTimerDisplay.setText(formatDuration(this.plugin.getTaskElapsed(task)));
				}
			}
		}

		const timerElements = container.querySelectorAll(".taskweaver-timer-small");
		timerElements.forEach((element) => {
			const taskId = element.getAttribute("data-task-id");
			if (taskId) {
				const task = this.plugin.settings.tasks.find(t => t.id === taskId);
				if (task) {
					element.setText(formatDuration(this.plugin.getTaskElapsed(task)));
				}
			}
		});
	}

	openAddTaskModal(): void {
		new AddTaskModal(this.app, this.plugin, (title, categoryId) => {
			this.plugin.addTask(title, categoryId);
		}).open();
	}

	openManageCategoriesModal(): void {
		new ManageCategoriesModal(this.app, this.plugin).open();
	}
}

class AddTaskModal extends Modal {
	plugin: TaskWeaverPlugin;
	onSubmit: (title: string, categoryId: string) => void;

	constructor(app: App, plugin: TaskWeaverPlugin, onSubmit: (title: string, categoryId: string) => void) {
		super(app);
		this.plugin = plugin;
		this.onSubmit = onSubmit;
	}

	onOpen(): void {
		const { contentEl } = this;
		contentEl.empty();

		contentEl.createEl("h3", { text: "Add New Task" });

		let taskTitle = "";
		let selectedCategoryId = this.plugin.settings.categories[0]?.id || "";

		new Setting(contentEl)
			.setName("Task title")
			.addText(text => text
				.setPlaceholder("Enter task title")
				.onChange(value => {
					taskTitle = value;
				}));

		if (this.plugin.settings.categories.length === 0) {
			contentEl.createEl("p", {
				text: "Please create a category first",
				cls: "taskweaver-warning"
			});

			new Setting(contentEl)
				.addButton(btn => btn
					.setButtonText("Create Category")
					.setCta()
					.onClick(() => {
						this.close();
						new ManageCategoriesModal(this.app, this.plugin).open();
					}));
		} else {
			const categorySection = contentEl.createDiv({ cls: "taskweaver-modal-section" });
			categorySection.createEl("label", { text: "Category", cls: "taskweaver-modal-label" });

			const categoriesGrid = categorySection.createDiv({ cls: "taskweaver-categories-grid" });

			this.plugin.settings.categories.forEach(cat => {
				const categoryBtn = categoriesGrid.createDiv({ cls: "taskweaver-category-btn" });
				categoryBtn.style.borderColor = cat.color;

				if (cat.id === selectedCategoryId) {
					categoryBtn.addClass("selected");
					categoryBtn.style.backgroundColor = cat.color + "20";
				}

				if (cat.emoji) {
					categoryBtn.createSpan({ text: cat.emoji, cls: "taskweaver-category-btn-emoji" });
				}
				categoryBtn.createSpan({ text: cat.name, cls: "taskweaver-category-btn-name" });

				categoryBtn.onclick = () => {
					selectedCategoryId = cat.id;
					categoriesGrid.querySelectorAll(".taskweaver-category-btn").forEach(btn => {
						btn.removeClass("selected");
						(btn as HTMLElement).style.backgroundColor = "";
					});
					categoryBtn.addClass("selected");
					categoryBtn.style.backgroundColor = cat.color + "20";
				};
			});

			new Setting(contentEl)
				.addButton(btn => btn
					.setButtonText("Cancel")
					.onClick(() => {
						this.close();
					}))
				.addButton(btn => btn
					.setButtonText("Add")
					.setCta()
					.onClick(() => {
						if (taskTitle && selectedCategoryId) {
							this.onSubmit(taskTitle, selectedCategoryId);
							this.close();
						}
					}));
		}
	}

	onClose(): void {
		const { contentEl } = this;
		contentEl.empty();
	}
}

class ManageCategoriesModal extends Modal {
	plugin: TaskWeaverPlugin;

	constructor(app: App, plugin: TaskWeaverPlugin) {
		super(app);
		this.plugin = plugin;
	}

	onOpen(): void {
		this.render();
	}

	render(): void {
		const { contentEl } = this;
		contentEl.empty();

		contentEl.createEl("h3", { text: "Manage Categories" });

		const categoriesList = contentEl.createDiv({ cls: "taskweaver-categories-list" });

		this.plugin.settings.categories.forEach(category => {
			const categoryItem = categoriesList.createDiv({ cls: "taskweaver-category-item" });

			const colorPreview = categoryItem.createDiv({ cls: "taskweaver-color-preview" });
			colorPreview.style.backgroundColor = category.color;

			const categoryInfo = categoryItem.createDiv({ cls: "taskweaver-category-info" });
			if (category.emoji) {
				categoryInfo.createSpan({ text: `${category.emoji} `, cls: "taskweaver-emoji" });
			}
			categoryInfo.createSpan({ text: category.name });

			const deleteBtn = categoryItem.createEl("button", {
				text: "Delete",
				cls: "taskweaver-btn-small"
			});
			deleteBtn.onclick = async () => {
				await this.plugin.deleteCategory(category.id);
				this.render();
			};
		});

		contentEl.createEl("h4", { text: "Add New Category" });

		let categoryName = "";
		let categoryColor = "#4a9eff";
		let categoryEmoji = "";

		new Setting(contentEl)
			.setName("Category name")
			.addText(text => text
				.setPlaceholder("e.g., Work, Personal")
				.onChange(value => {
					categoryName = value;
				}));

		const colorSetting = new Setting(contentEl)
			.setName("Color");

		const colorContainer = colorSetting.settingEl.createDiv({ cls: "taskweaver-color-picker-container" });

		const presetColors = [
			"#4a9eff", "#ff6b6b", "#51cf66", "#ffd43b",
			"#ff8787", "#cc5de8", "#339af0", "#ff922b",
			"#20c997", "#e599f7", "#74c0fc", "#a9e34b"
		];

		const presetContainer = colorContainer.createDiv({ cls: "taskweaver-preset-colors" });

		presetColors.forEach(color => {
			const colorOption = presetContainer.createDiv({ cls: "taskweaver-color-option" });
			colorOption.style.backgroundColor = color;
			if (color === categoryColor) {
				colorOption.addClass("selected");
			}
			colorOption.onclick = () => {
				categoryColor = color;
				presetContainer.querySelectorAll(".taskweaver-color-option").forEach(el =>
					el.removeClass("selected")
				);
				colorOption.addClass("selected");
				colorPicker.value = color;
			};
		});

		const customColorContainer = colorContainer.createDiv({ cls: "taskweaver-custom-color" });
		customColorContainer.createEl("label", { text: "Custom: " });
		const colorPicker = customColorContainer.createEl("input", { type: "color" });
		colorPicker.value = categoryColor;
		colorPicker.oninput = () => {
			categoryColor = colorPicker.value;
			presetContainer.querySelectorAll(".taskweaver-color-option").forEach(el =>
				el.removeClass("selected")
			);
		};

		new Setting(contentEl)
			.setName("Emoji (optional)")
			.addText(text => text
				.setPlaceholder("💼")
				.onChange(value => {
					categoryEmoji = value;
				}));

		new Setting(contentEl)
			.addButton(btn => btn
				.setButtonText("Close")
				.onClick(() => {
					this.close();
				}))
			.addButton(btn => btn
				.setButtonText("Add Category")
				.setCta()
				.onClick(async () => {
					if (categoryName) {
						await this.plugin.addCategory(categoryName, categoryColor, categoryEmoji);
						this.render();
					}
				}));
	}

	onClose(): void {
		const { contentEl } = this;
		contentEl.empty();
	}
}