import {
	InclusionMode,
	KanbanSortType,
	MatrixConfig,
	MatrixMode,
	URGENT_TAG,
	IMPORTANT_TAG,
	IN_PROGRESS_TAG,
} from "./types";
import { parseNotebookOption } from "./resolveNotebook";

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

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

	// mode
	let mode: MatrixMode = "skeleton";
	if (input.mode !== undefined) {
		const candidate = String(input.mode).toLowerCase();
		if (candidate === "skeleton" || candidate === "eisenhower") {
			mode = candidate as MatrixMode;
		} else {
			warnings.push(`Invalid mode "${input.mode}" (using "skeleton")`);
		}
	}

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

	// scope (shared semantics with gtd-calendar / gtd-kanban)
	let scopeDepth = 0;
	let scopeAll = false;
	if (input.scope !== undefined) {
		const value = input.scope;
		if (value === "all") {
			scopeAll = true;
		} else 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")`);
		}
	}

	const notebook = parseNotebookOption(input.notebook);
	if (scopeAll && notebook) {
		warnings.push(
			`"notebook" is ignored when scope: all (scanning every notebook)`
		);
	}

	// 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: MatrixConfig["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")`);
		}
	}

	// axis tags (configurable; lowercased for tag comparison)
	const urgentTag = parseTag(input["urgent-tag"], URGENT_TAG);
	const importantTag = parseTag(input["important-tag"], IMPORTANT_TAG);
	if (urgentTag === importantTag) {
		warnings.push(
			`urgent-tag and important-tag are both "${urgentTag}" — quadrants will not separate`
		);
	}

	// skeleton mode: in-progress tag + urgent window
	const inProgressTag = parseTag(input["in-progress-tag"], IN_PROGRESS_TAG);

	let urgentWindow = 3;
	if (input["urgent-window"] !== undefined) {
		const value = input["urgent-window"];
		if (Number.isInteger(Number(value)) && Number(value) >= 0) {
			urgentWindow = Number(value);
		} else {
			warnings.push(`Invalid urgent-window "${value}" (using 3)`);
		}
	}

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

	return {
		mode,
		title,
		scopeDepth,
		scopeAll,
		notebook,
		todos,
		sortType,
		sort,
		urgentTag,
		importantTag,
		inProgressTag,
		urgentWindow,
		cardDetail,
		warnings,
	};
}

function parseTag(value: any, fallback: string): string {
	if (value === undefined || value === null) return fallback;
	const candidate = String(value).trim().toLowerCase();
	return candidate === "" ? fallback : candidate;
}