import { KanbanConfig, InclusionMode, KanbanSortType } from "./types";

const INCLUSION_MODES: InclusionMode[] = ["gtd-only", "all", "none"];
const SORT_TYPES: KanbanSortType[] = ["due-date", "title", "modified-date"];
const CARD_DETAILS = ["hover", "always", "none"];

/**
 * Normalise a parsed gtd-kanban YAML object into a KanbanConfig with
 * SPEC defaults. Invalid values produce warnings, not failures.
 */
export default function parseKanbanConfig(raw: any): KanbanConfig {
	const warnings: string[] = [];
	const input = raw && typeof raw === "object" ? raw : {};

	const knownKeys = [
		"title",
		"scope",
		"todos",
		"sort-type",
		"sort",
		"in-progress-tag",
		"card-detail",
		"done-window",
	];
	for (const key of Object.keys(input)) {
		if (!knownKeys.includes(key)) warnings.push(`Unknown option "${key}"`);
	}

	const title =
		input.title !== undefined && input.title !== null
			? String(input.title)
			: null;

	// scope (shared semantics with gtd-calendar)
	let scopeDepth = 0;
	if (input.scope !== undefined) {
		const value = input.scope;
		if (value === "this-folder") {
			scopeDepth = 0;
		} else if (value === "children") {
			scopeDepth = Infinity;
		} else if (Number.isInteger(Number(value)) && Number(value) >= 0) {
			scopeDepth = Number(value);
		} else {
			warnings.push(`Invalid scope "${value}" (using "this-folder")`);
		}
	}

	// todos inclusion
	let todos: InclusionMode = "gtd-only";
	if (input.todos !== undefined) {
		const candidate = String(input.todos).toLowerCase() as InclusionMode;
		if (INCLUSION_MODES.includes(candidate)) {
			todos = candidate;
		} else {
			warnings.push(`Invalid todos "${input.todos}" (using "gtd-only")`);
		}
	}

	// sort-type
	let sortType: KanbanSortType = "due-date";
	if (input["sort-type"] !== undefined) {
		let candidate = String(input["sort-type"]).toLowerCase();
		if (candidate === "modified_date") candidate = "modified-date"; // alias
		if (SORT_TYPES.includes(candidate as KanbanSortType)) {
			sortType = candidate as KanbanSortType;
		} else {
			warnings.push(
				`Invalid sort-type "${input["sort-type"]}" (using "due-date")`
			);
		}
	}

	// sort direction
	let sort: KanbanConfig["sort"] = "asc";
	if (input.sort !== undefined) {
		const candidate = String(input.sort).toLowerCase();
		if (candidate === "asc" || candidate === "desc") {
			sort = candidate;
		} else {
			warnings.push(`Invalid sort "${input.sort}" (using "asc")`);
		}
	}

	// in-progress tag (configurable; lowercased to match tag comparison)
	let inProgressTag = "in-progress";
	if (
		input["in-progress-tag"] !== undefined &&
		input["in-progress-tag"] !== null &&
		String(input["in-progress-tag"]).trim() !== ""
	) {
		inProgressTag = String(input["in-progress-tag"]).trim().toLowerCase();
	}

	// card-detail
	let cardDetail: KanbanConfig["cardDetail"] = "hover";
	if (input["card-detail"] !== undefined) {
		const candidate = String(input["card-detail"]).toLowerCase();
		if (CARD_DETAILS.includes(candidate)) {
			cardDetail = candidate as KanbanConfig["cardDetail"];
		} else {
			warnings.push(
				`Invalid card-detail "${input["card-detail"]}" (using "hover")`
			);
		}
	}

	// done-window (days; "all" => Infinity)
	let doneWindow = 7;
	if (input["done-window"] !== undefined) {
		const value = input["done-window"];
		if (String(value).toLowerCase() === "all") {
			doneWindow = Infinity;
		} else if (Number.isInteger(Number(value)) && Number(value) >= 0) {
			doneWindow = Number(value);
		} else {
			warnings.push(`Invalid done-window "${value}" (using 7)`);
		}
	}

	return {
		title,
		scopeDepth,
		todos,
		sortType,
		sort,
		inProgressTag,
		cardDetail,
		doneWindow,
		warnings,
	};
}