/*
 * Copyright (C) 2026 Fluxer Contributors
 *
 * This file is part of Fluxer.
 *
 * Fluxer is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Fluxer is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with Fluxer. If not, see <https://www.gnu.org/licenses/>.
 */

import {createTestAccount, setUserACLs} from '@fluxer/api/src/auth/tests/AuthTestUtils';
import {createGuild, getUserGuilds} from '@fluxer/api/src/guild/tests/GuildTestUtils';
import {type ApiTestHarness, createApiTestHarness} from '@fluxer/api/src/test/ApiTestHarness';
import {HTTP_STATUS, TEST_IDS} from '@fluxer/api/src/test/TestConstants';
import {createBuilder, createBuilderWithoutAuth} from '@fluxer/api/src/test/TestRequestBuilder';
import {APIErrorCodes} from '@fluxer/constants/src/ApiErrorCodes';
import {DiscoveryCategories, DiscoveryCategoryLabels} from '@fluxer/constants/src/DiscoveryConstants';
import type {
	DiscoveryApplicationResponse,
	DiscoveryCategoryResponse,
	DiscoveryGuildListResponse,
} from '@fluxer/schema/src/domains/guild/GuildDiscoverySchemas';
import {afterEach, beforeEach, describe, expect, test} from 'vitest';

async function setGuildMemberCount(harness: ApiTestHarness, guildId: string, memberCount: number): Promise<void> {
	await createBuilder(harness, '')
		.post(`/test/guilds/${guildId}/member-count`)
		.body({member_count: memberCount})
		.execute();
}

async function applyAndApprove(
	harness: ApiTestHarness,
	ownerToken: string,
	adminToken: string,
	guildId: string,
	description: string,
	categoryId: number,
): Promise<void> {
	await createBuilder<DiscoveryApplicationResponse>(harness, ownerToken)
		.post(`/guilds/${guildId}/discovery`)
		.body({description, category_type: categoryId})
		.expect(HTTP_STATUS.OK)
		.execute();

	await createBuilder(harness, `Bearer ${adminToken}`)
		.post(`/admin/discovery/applications/${guildId}/approve`)
		.body({})
		.expect(HTTP_STATUS.OK)
		.execute();
}

describe('Discovery Search and Join', () => {
	let harness: ApiTestHarness;

	beforeEach(async () => {
		harness = await createApiTestHarness();
	});

	afterEach(async () => {
		await harness?.shutdown();
	});

	describe('categories', () => {
		test('should list all discovery categories', async () => {
			const user = await createTestAccount(harness);

			const categories = await createBuilder<Array<DiscoveryCategoryResponse>>(harness, user.token)
				.get('/discovery/categories')
				.expect(HTTP_STATUS.OK)
				.execute();

			const expectedCount = Object.keys(DiscoveryCategoryLabels).length;
			expect(categories).toHaveLength(expectedCount);

			for (const category of categories) {
				expect(category.id).toBeTypeOf('number');
				expect(category.name).toBeTypeOf('string');
				expect(category.name.length).toBeGreaterThan(0);
			}
		});

		test('should include known categories', async () => {
			const user = await createTestAccount(harness);

			const categories = await createBuilder<Array<DiscoveryCategoryResponse>>(harness, user.token)
				.get('/discovery/categories')
				.expect(HTTP_STATUS.OK)
				.execute();

			const names = categories.map((c) => c.name);
			expect(names).toContain('Gaming');
			expect(names).toContain('Music');
			expect(names).toContain('Education');
			expect(names).toContain('Science & Technology');
		});

		test('should require login to list categories', async () => {
			await createBuilderWithoutAuth(harness).get('/discovery/categories').expect(HTTP_STATUS.UNAUTHORIZED).execute();
		});
	});

	describe('search', () => {
		test('should return empty results when no guilds are discoverable', async () => {
			const user = await createTestAccount(harness);

			const results = await createBuilder<DiscoveryGuildListResponse>(harness, user.token)
				.get('/discovery/guilds')
				.expect(HTTP_STATUS.OK)
				.execute();

			expect(results.guilds).toHaveLength(0);
			expect(results.total).toBe(0);
		});

		test('should return approved guilds in search results', async () => {
			const owner = await createTestAccount(harness);
			const guild = await createGuild(harness, owner.token, 'Searchable Guild');
			await setGuildMemberCount(harness, guild.id, 10);

			const admin = await createTestAccount(harness);
			await setUserACLs(harness, admin, ['admin:authenticate', 'discovery:review']);

			await applyAndApprove(
				harness,
				owner.token,
				admin.token,
				guild.id,
				'A searchable community for all',
				DiscoveryCategories.GAMING,
			);

			const searcher = await createTestAccount(harness);
			const results = await createBuilder<DiscoveryGuildListResponse>(harness, searcher.token)
				.get('/discovery/guilds')
				.expect(HTTP_STATUS.OK)
				.execute();

			expect(results.guilds.length).toBeGreaterThanOrEqual(1);
			const found = results.guilds.find((g) => g.id === guild.id);
			expect(found).toBeDefined();
			expect(found!.name).toBe('Searchable Guild');
			expect(found!.description).toBe('A searchable community for all');
			expect(found!.category_type).toBe(DiscoveryCategories.GAMING);
		});

		test('should not return pending guilds in search results', async () => {
			const owner = await createTestAccount(harness);
			const guild = await createGuild(harness, owner.token, 'Pending Guild');
			await setGuildMemberCount(harness, guild.id, 1);

			await createBuilder<DiscoveryApplicationResponse>(harness, owner.token)
				.post(`/guilds/${guild.id}/discovery`)
				.body({description: 'Pending application guild', category_type: DiscoveryCategories.GAMING})
				.expect(HTTP_STATUS.OK)
				.execute();

			const searcher = await createTestAccount(harness);
			const results = await createBuilder<DiscoveryGuildListResponse>(harness, searcher.token)
				.get('/discovery/guilds')
				.expect(HTTP_STATUS.OK)
				.execute();

			const found = results.guilds.find((g) => g.id === guild.id);
			expect(found).toBeUndefined();
		});

		test('should filter by category', async () => {
			const admin = await createTestAccount(harness);
			await setUserACLs(harness, admin, ['admin:authenticate', 'discovery:review']);

			const owner1 = await createTestAccount(harness);
			const gamingGuild = await createGuild(harness, owner1.token, 'Gaming Community');
			await setGuildMemberCount(harness, gamingGuild.id, 10);
			await applyAndApprove(
				harness,
				owner1.token,
				admin.token,
				gamingGuild.id,
				'All about gaming',
				DiscoveryCategories.GAMING,
			);

			const owner2 = await createTestAccount(harness);
			const musicGuild = await createGuild(harness, owner2.token, 'Music Community');
			await setGuildMemberCount(harness, musicGuild.id, 10);
			await applyAndApprove(
				harness,
				owner2.token,
				admin.token,
				musicGuild.id,
				'All about music',
				DiscoveryCategories.MUSIC,
			);

			const searcher = await createTestAccount(harness);
			const results = await createBuilder<DiscoveryGuildListResponse>(harness, searcher.token)
				.get(`/discovery/guilds?category=${DiscoveryCategories.GAMING}`)
				.expect(HTTP_STATUS.OK)
				.execute();

			for (const guild of results.guilds) {
				expect(guild.category_type).toBe(DiscoveryCategories.GAMING);
			}
		});

		test('should respect limit parameter', async () => {
			const admin = await createTestAccount(harness);
			await setUserACLs(harness, admin, ['admin:authenticate', 'discovery:review']);

			for (let i = 0; i < 3; i++) {
				const owner = await createTestAccount(harness);
				const guild = await createGuild(harness, owner.token, `Limit Test Guild ${i}`);
				await setGuildMemberCount(harness, guild.id, 10);
				await applyAndApprove(
					harness,
					owner.token,
					admin.token,
					guild.id,
					`Community number ${i} for testing`,
					DiscoveryCategories.GAMING,
				);
			}

			const searcher = await createTestAccount(harness);
			const results = await createBuilder<DiscoveryGuildListResponse>(harness, searcher.token)
				.get('/discovery/guilds?limit=2')
				.expect(HTTP_STATUS.OK)
				.execute();

			expect(results.guilds.length).toBeLessThanOrEqual(2);
		});

		test('should require login to search', async () => {
			await createBuilderWithoutAuth(harness).get('/discovery/guilds').expect(HTTP_STATUS.UNAUTHORIZED).execute();
		});
	});

	describe('join', () => {
		test('should join a discoverable guild', async () => {
			const owner = await createTestAccount(harness);
			const guild = await createGuild(harness, owner.token, 'Joinable Guild');
			await setGuildMemberCount(harness, guild.id, 10);

			const admin = await createTestAccount(harness);
			await setUserACLs(harness, admin, ['admin:authenticate', 'discovery:review']);
			await applyAndApprove(
				harness,
				owner.token,
				admin.token,
				guild.id,
				'Join this community',
				DiscoveryCategories.GAMING,
			);

			const joiner = await createTestAccount(harness);
			await createBuilder(harness, joiner.token)
				.post(`/discovery/guilds/${guild.id}/join`)
				.expect(HTTP_STATUS.NO_CONTENT)
				.execute();

			const guilds = await getUserGuilds(harness, joiner.token);
			const joined = guilds.find((g) => g.id === guild.id);
			expect(joined).toBeDefined();
		});

		test('should not allow joining non-discoverable guild', async () => {
			const owner = await createTestAccount(harness);
			const guild = await createGuild(harness, owner.token, 'Not Discoverable');

			const joiner = await createTestAccount(harness);
			await createBuilder(harness, joiner.token)
				.post(`/discovery/guilds/${guild.id}/join`)
				.expect(HTTP_STATUS.BAD_REQUEST, APIErrorCodes.DISCOVERY_NOT_DISCOVERABLE)
				.execute();
		});

		test('should not allow joining guild with only pending application', async () => {
			const owner = await createTestAccount(harness);
			const guild = await createGuild(harness, owner.token, 'Pending Join Guild');
			await setGuildMemberCount(harness, guild.id, 1);

			await createBuilder<DiscoveryApplicationResponse>(harness, owner.token)
				.post(`/guilds/${guild.id}/discovery`)
				.body({description: 'Pending but not yet approved', category_type: DiscoveryCategories.GAMING})
				.expect(HTTP_STATUS.OK)
				.execute();

			const joiner = await createTestAccount(harness);
			await createBuilder(harness, joiner.token)
				.post(`/discovery/guilds/${guild.id}/join`)
				.expect(HTTP_STATUS.BAD_REQUEST, APIErrorCodes.DISCOVERY_NOT_DISCOVERABLE)
				.execute();
		});

		test('should not allow joining with nonexistent guild ID', async () => {
			const joiner = await createTestAccount(harness);
			await createBuilder(harness, joiner.token)
				.post(`/discovery/guilds/${TEST_IDS.NONEXISTENT_GUILD}/join`)
				.expect(HTTP_STATUS.BAD_REQUEST, APIErrorCodes.DISCOVERY_NOT_DISCOVERABLE)
				.execute();
		});

		test('should require login to join', async () => {
			await createBuilderWithoutAuth(harness)
				.post(`/discovery/guilds/${TEST_IDS.NONEXISTENT_GUILD}/join`)
				.expect(HTTP_STATUS.UNAUTHORIZED)
				.execute();
		});
	});
});