import Wrapper from './shared/Wrapper.js';
import create_debugging_comment from './shared/create_debugging_comment.js';
import { b, x } from 'code-red';
import FragmentWrapper from './Fragment.js';
import ThenBlock from '../../nodes/ThenBlock.js';
import CatchBlock from '../../nodes/CatchBlock.js';
import { add_const_tags, add_const_tags_context } from './shared/add_const_tags.js';
import Expression from '../../nodes/shared/Expression.js';

/** @extends Wrapper<import('../../nodes/PendingBlock.js').default | import('../../nodes/ThenBlock.js').default | import('../../nodes/CatchBlock.js').default> */
class AwaitBlockBranch extends Wrapper {
	/** @typedef {'pending' | 'then' | 'catch'} Status */

	/** @type {import('../Block.js').default} */
	block;

	/** @type {import('./Fragment.js').default} */
	fragment;

	/** @type {boolean} */
	is_dynamic;

	var = null;

	/** @type {Status} */
	status;

	/** @type {string} */
	value;

	/** @type {import('estree').Literal} */
	value_index;

	/** @type {import('../../nodes/shared/Context.js').Context[]} */
	value_contexts;

	/** @type {boolean} */
	is_destructured;

	/**
	 * @param {Status} status
	 * @param {import('../Renderer.js').default} renderer
	 * @param {import('../Block.js').default} block
	 * @param {AwaitBlockWrapper} parent
	 * @param {import('../../nodes/PendingBlock.js').default | import('../../nodes/ThenBlock.js').default | import('../../nodes/CatchBlock.js').default} node
	 * @param {boolean} strip_whitespace
	 * @param {import('./shared/Wrapper.js').default} next_sibling
	 */
	constructor(status, renderer, block, parent, node, strip_whitespace, next_sibling) {
		super(renderer, block, parent, node);
		this.status = status;
		this.block = block.child({
			comment: create_debugging_comment(node, this.renderer.component),
			name: this.renderer.component.get_unique_name(`create_${status}_block`),
			type: status
		});
		this.add_context(parent.node[status + '_node'], parent.node[status + '_contexts']);
		this.fragment = new FragmentWrapper(
			renderer,
			this.block,
			this.node.children,
			parent,
			strip_whitespace,
			next_sibling
		);
		this.is_dynamic = this.block.dependencies.size > 0;
	}

	/**
	 * @param {import('estree').Node | null} node
	 * @param {import('../../nodes/shared/Context.js').Context[]} contexts
	 */
	add_context(node, contexts) {
		if (!node) return;
		if (node.type === 'Identifier') {
			this.value = node.name;
			this.renderer.add_to_context(this.value, true);
		} else {
			contexts.forEach((context) => {
				if (context.type !== 'DestructuredVariable') return;
				this.renderer.add_to_context(context.key.name, true);
			});
			this.value = this.block.parent.get_unique_name('value').name;
			this.value_contexts = contexts;
			this.renderer.add_to_context(this.value, true);
			this.is_destructured = true;
		}
		this.value_index = this.renderer.context_lookup.get(this.value).index;
		if (this.has_consts(this.node)) {
			add_const_tags_context(this.renderer, this.node.const_tags);
		}
	}

	/**
	 * @param {import('../../nodes/PendingBlock.js').default | import('../../nodes/ThenBlock.js').default | import('../../nodes/CatchBlock.js').default} node
	 * @returns {node is import('../../nodes/ThenBlock.js').default | import('../../nodes/CatchBlock.js').default}
	 */
	has_consts(node) {
		return node instanceof ThenBlock || node instanceof CatchBlock;
	}

	/**
	 * @param {import('../Block.js').default} block
	 * @param {import('estree').Identifier} parent_node
	 * @param {import('estree').Identifier} parent_nodes
	 */
	render(block, parent_node, parent_nodes) {
		this.fragment.render(block, parent_node, parent_nodes);
		if (this.is_destructured || (this.has_consts(this.node) && this.node.const_tags.length > 0)) {
			this.render_get_context();
		}
	}
	render_get_context() {
		const props = this.is_destructured
			? this.value_contexts.map((prop) => {
					if (prop.type === 'ComputedProperty') {
						const expression = new Expression(
							this.renderer.component,
							this.node,
							this.has_consts(this.node) ? this.node.scope : null,
							prop.key
						);
						return b`const ${prop.property_name} = ${expression.manipulate(this.block, '#ctx')};`;
					} else {
						/** @param {any} name */
						const to_ctx = (name) => this.renderer.reference(name);
						return b`#ctx[${
							this.block.renderer.context_lookup.get(prop.key.name).index
						}] = ${prop.default_modifier(prop.modifier(x`#ctx[${this.value_index}]`), to_ctx)};`;
					}
			  })
			: null;
		const const_tags_props = this.has_consts(this.node)
			? add_const_tags(this.block, this.node.const_tags, '#ctx')
			: null;
		const get_context = this.block.renderer.component.get_unique_name(`get_${this.status}_context`);
		this.block.renderer.blocks.push(b`
			function ${get_context}(#ctx) {
				${props}
				${const_tags_props}
			}
		`);
		this.block.chunks.declarations.push(b`${get_context}(#ctx)`);
		if (this.block.has_update_method) {
			this.block.chunks.update.unshift(b`${get_context}(#ctx)`);
		}
	}
}

/** @extends Wrapper<import('../../nodes/AwaitBlock.js').default> */
export default class AwaitBlockWrapper extends Wrapper {
	/** @type {AwaitBlockBranch} */
	pending;

	/** @type {AwaitBlockBranch} */
	then;

	/** @type {AwaitBlockBranch} */
	catch;

	/** @type {import('estree').Identifier} */
	var = { type: 'Identifier', name: 'await_block' };

	/**
	 * @param {import('../Renderer.js').default} renderer
	 * @param {import('../Block.js').default} block
	 * @param {import('./shared/Wrapper.js').default} parent
	 * @param {import('../../nodes/AwaitBlock.js').default} node
	 * @param {boolean} strip_whitespace
	 * @param {import('./shared/Wrapper.js').default} next_sibling
	 */
	constructor(renderer, block, parent, node, strip_whitespace, next_sibling) {
		super(renderer, block, parent, node);
		block.add_dependencies(this.node.expression.dependencies);
		let is_dynamic = false;
		let has_intros = false;
		let has_outros = false;
		/** @type {const} */ (['pending', 'then', 'catch']).forEach((status) => {
			const child = this.node[status];
			const branch = new AwaitBlockBranch(
				status,
				renderer,
				block,
				this,
				child,
				strip_whitespace,
				next_sibling
			);
			renderer.blocks.push(branch.block);
			if (branch.is_dynamic) {
				is_dynamic = true;
				// TODO should blocks update their own parents?
				block.add_dependencies(branch.block.dependencies);
			}
			if (branch.block.has_intros) has_intros = true;
			if (branch.block.has_outros) has_outros = true;
			this[status] = branch;
		});
		['pending', 'then', 'catch'].forEach((status) => {
			this[status].block.has_update_method = is_dynamic;
			this[status].block.has_intro_method = has_intros;
			this[status].block.has_outro_method = has_outros;
		});
		if (has_outros) {
			block.add_outro();
		}
	}

	/**
	 * @param {import('../Block.js').default} block
	 * @param {import('estree').Identifier} parent_node
	 * @param {import('estree').Identifier} parent_nodes
	 */
	render(block, parent_node, parent_nodes) {
		const anchor = this.get_or_create_anchor(block, parent_node, parent_nodes);
		const update_mount_node = this.get_update_mount_node(anchor);
		const snippet = this.node.expression.manipulate(block);
		const info = block.get_unique_name('info');
		const promise = block.get_unique_name('promise');
		block.add_variable(promise);
		block.maintain_context = true;

		/** @type {any} */
		const info_props = x`{
			ctx: #ctx,
			current: null,
			token: null,
			hasCatch: ${this.catch.node.start !== null ? 'true' : 'false'},
			pending: ${this.pending.block.name},
			then: ${this.then.block.name},
			catch: ${this.catch.block.name},
			value: ${this.then.value_index},
			error: ${this.catch.value_index},
			blocks: ${this.pending.block.has_outro_method && x`[,,,]`}
		}`;
		block.chunks.init.push(b`
			let ${info} = ${info_props};
		`);
		block.chunks.init.push(b`
			@handle_promise(${promise} = ${snippet}, ${info});
		`);
		block.chunks.create.push(b`
			${info}.block.c();
		`);
		if (parent_nodes && this.renderer.options.hydratable) {
			block.chunks.claim.push(b`
				${info}.block.l(${parent_nodes});
			`);
		}
		const initial_mount_node = parent_node || '#target';
		const anchor_node = parent_node ? 'null' : '#anchor';
		const has_transitions =
			this.pending.block.has_intro_method || this.pending.block.has_outro_method;
		block.chunks.mount.push(b`
			${info}.block.m(${initial_mount_node}, ${info}.anchor = ${anchor_node});
			${info}.mount = () => ${update_mount_node};
			${info}.anchor = ${anchor};
		`);
		if (has_transitions) {
			block.chunks.intro.push(b`@transition_in(${info}.block);`);
		}
		const dependencies = this.node.expression.dynamic_dependencies();
		const update_await_block_branch = b`@update_await_block_branch(${info}, #ctx, #dirty)`;
		if (dependencies.length > 0) {
			const condition = x`
				${block.renderer.dirty(dependencies)} &&
				${promise} !== (${promise} = ${snippet}) &&
				@handle_promise(${promise}, ${info})`;
			block.chunks.update.push(b`${info}.ctx = #ctx;`);
			if (this.pending.block.has_update_method) {
				block.chunks.update.push(b`
					if (${condition}) {

					} else {
						${update_await_block_branch}
					}
				`);
			} else {
				block.chunks.update.push(b`
					${condition}
				`);
			}
		} else {
			if (this.pending.block.has_update_method) {
				block.chunks.update.push(b`
					${update_await_block_branch}
				`);
			}
		}
		if (this.pending.block.has_outro_method) {
			block.chunks.outro.push(b`
				for (let #i = 0; #i < 3; #i += 1) {
					const block = ${info}.blocks[#i];
					@transition_out(block);
				}
			`);
		}
		block.chunks.destroy.push(b`
			${info}.block.d(${parent_node ? null : 'detaching'});
			${info}.token = null;
			${info} = null;
		`);
		[this.pending, this.then, this.catch].forEach((branch) => {
			branch.render(branch.block, null, /** @type {import('estree').Identifier} */ (x`#nodes`));
		});
	}
}