'use strict';

const { action, assert, REST, utils } = require( 'api-testing' );
const supertest = require( 'supertest' );

describe( 'Page History', () => {
	const title = utils.title( 'PageHistory_' );
	const titleToDelete = utils.title( 'PageHistoryDelete_' );
	const client = new REST();

	let mindy, bot, anon, alice, root;
	let autoCreateTempUserEnabled = false;

	const edits = {
		all: [],
		anon: [],
		temp: [],
		bot: [],
		reverts: []
	};

	async function setupDeletedPage() {
		const editOne = await bot.edit( titleToDelete, { text: 'Delete Me 1', summary: 'edit 1' } );
		const editTwo = await mindy.edit( titleToDelete, { text: 'Counting 1', summary: 'edit 2' } );
		return { editOne, editTwo };
	}

	async function assertGetStatus( url, status = 200 ) {
		const response = await supertest.agent( url ).get( '' );
		assert.equal( response.status, status, `Status of GET ${ url }` );
	}

	const addEditInfo = ( editInfo, editBuckets, anonUsername ) => {
		const obj = {
			id: editInfo.newrevid,
			comment: editInfo.param_summary,
			'user.name': anonUsername || editInfo.param_user,
			minor: !!editInfo.param_minor
		};

		edits.all.unshift( obj );
		editBuckets.forEach( ( editBucket ) => editBucket.unshift( obj ) );
	};

	before( async () => {
		// Users
		bot = await action.robby();
		anon = action.getAnon();
		alice = await action.alice();
		mindy = await action.mindy();
		root = await action.root();
		await root.addGroups( mindy.username, [ 'suppress' ] );

		const siteInfoQuery = await anon.action(
			'query',
			// fetch flag $wgAutoCreateTempUser['enabled'], and format to
			// true/false for convenience
			{ meta: 'siteinfo', siprop: 'autocreatetempuser', formatversion: 2 }
		);
		autoCreateTempUserEnabled = siteInfoQuery.query.autocreatetempuser.enabled;

		// Create a page and make edits by various users and store edit information
		addEditInfo( await alice.edit( title, { text: 'Counting 1', summary: 'creating page' } ), [] );

		if ( autoCreateTempUserEnabled ) {
			const resultAnonEdit = await anon.edit( title, { text: 'Counting 1 2', summary: 'anon edit 1' } );
			const anonInfo = await anon.meta( 'userinfo', {} );
			addEditInfo( resultAnonEdit, [ edits.temp ], anonInfo.name );

			// Second edit for new anonymous user (new temp account)
			anon = action.getAnon();
			const resultAnonEdit2 = await anon.edit( title, { text: 'Counting 1 2 3', summary: 'anon edit 2' } );
			const anonInfoEdit2 = await anon.meta( 'userinfo', {} );
			addEditInfo( resultAnonEdit2, [ edits.temp ], anonInfoEdit2.name );
		} else {
			const anonInfo = await anon.meta( 'userinfo', {} );
			anon.username = anonInfo.name;
			addEditInfo( await anon.edit( title, { text: 'Counting 1 2', summary: 'anon edit 1' } ), [ edits.anon ] );
			addEditInfo( await anon.edit( title, { text: 'Counting 1 2 3', summary: 'anon edit 2' } ), [ edits.anon ] );
		}
		addEditInfo( await bot.edit( title, { text: 'Counting 1 2 3 4', summary: 'bot edit 1' } ), [ edits.bot ] );
		addEditInfo( await bot.edit( title, { text: 'Counting 1 2 3 4 5', summary: 'bot edit 2' } ), [ edits.bot ] );

		// Rollback edits by bot
		const summary = 'revert edits by bot';
		const { rollback } = await mindy.action( 'rollback', {
			title,
			user: bot.username,
			summary,
			token: await mindy.token( 'rollback' )
		}, 'POST' );

		// record info for use by addEditInfo()
		rollback.newrevid = rollback.revid;
		rollback.param_summary = summary;
		rollback.param_user = mindy.username;
		// Rollbacks are minor by default
		rollback.param_minor = true;

		// Make sure we have something in cache in MW, so that we can verify later on it's updated
		await client.get( `/page/${ title }/history/counts/edits` );
		await utils.sleep();

		addEditInfo( rollback, [ edits.reverts ] );

		// The bot manually reverts the page to bot edit 1
		addEditInfo(
			await bot.edit( title, { text: 'Counting 1 2 3 4', summary: 'bot edit 3', minor: true } ),
			[ edits.bot, edits.reverts ]
		);
		addEditInfo( await bot.edit( title, { text: 'Counting 1 2 3 4 555', summary: 'bot edit 4' } ), [ edits.bot ] );

		// Undo last edit
		addEditInfo( await mindy.edit( title, { undo: edits.all[ 0 ].id } ), [ edits.reverts ] );

	} );

	describe( 'Revision deletion and un-deletion', () => {
		let deleteEdits;
		it( 'Should get total number of edits and editors when edits are hidden and shown', async () => {
			deleteEdits = await setupDeletedPage();
			const { editOne } = deleteEdits;

			// Populate cache
			const { body, status, headers } = await client.get(
				`/page/${ titleToDelete }/history/counts/edits`
			);
			assert.equal( status, 200 );
			assert.match( headers[ 'content-type' ], /^application\/json/ );
			assert.deepEqual( body, { count: 2, limit: false }, 'Initial edit count of 2 ' );

			// Hack: If edits are not > 1 sec apart the latest timestamp will not not be detected.
			// Handler uses logging table timestamps to determine last modified time,
			// which are MW timestamps down to the sec, not ms.
			await utils.sleep();

			// Hide revision
			await mindy.action( 'revisiondelete',
				{
					type: 'revision',
					token: await mindy.token(),
					target: titleToDelete,
					hide: 'content|comment|user',
					ids: editOne.newrevid
				},
				'POST'
			);

			const revHideEdits = await client.get( `/page/${ titleToDelete }/history/counts/edits` );
			assert.equal( revHideEdits.status, 200 );
			assert.match( revHideEdits.headers[ 'content-type' ], /^application\/json/ );
			assert.deepEqual( revHideEdits.body, { count: 1, limit: false }, 'Edit count of 1 after hiding a revision' );

			const revHideEditors = await client.get( `/page/${ titleToDelete }/history/counts/editors` );
			assert.equal( revHideEditors.status, 200 );
			assert.match( revHideEditors.headers[ 'content-type' ], /^application\/json/ );
			assert.deepEqual( revHideEditors.body, { count: 1, limit: false }, 'Editor count of 1 after hiding a revision' );

			await utils.sleep();

			// Show revision
			await mindy.action( 'revisiondelete',
				{
					type: 'revision',
					token: await mindy.token(),
					target: titleToDelete,
					show: 'content|comment|user',
					ids: editOne.newrevid
				},
				'POST'
			);

			const revShowEdits = await client.get( `/page/${ titleToDelete }/history/counts/edits` );
			assert.equal( revShowEdits.status, 200 );
			assert.match( revShowEdits.headers[ 'content-type' ], /^application\/json/ );
			assert.deepEqual( revShowEdits.body, { count: 2, limit: false }, 'Edit count of 2 after un-hiding the hidden revision' );

			const revShowEditors = await client.get( `/page/${ titleToDelete }/history/counts/editors` );
			assert.equal( revShowEditors.status, 200 );
			assert.match( revShowEditors.headers[ 'content-type' ], /^application\/json/ );
			assert.deepEqual( revShowEditors.body, { count: 2, limit: false }, 'Editor count of 2 after un-hiding the hidden revision' );
		} );

		it( 'Should update last-modified header after revision deletion', async () => {
			const { headers } = await client.get( `/page/${ titleToDelete }/history/counts/edits` );
			const { editTwo } = deleteEdits;
			assert.containsAllKeys( headers, [ 'last-modified' ] );
			const lastTouchedTS = Date.parse( editTwo.newtimestamp );
			const headerLastModTS = Date.parse( headers[ 'last-modified' ] );
			assert.isAbove( headerLastModTS, lastTouchedTS );
		} );
	} );

	describe( 'GET /page/{title}/history/counts/edits', () => {
		it( 'Should get total number of edits', async () => {
			// we do 2 requests to verify the second value coming from cache is the same
			for ( let i = 0; i < 2; i++ ) {
				const res = await client.get( `/page/${ title }/history/counts/edits` );
				assert.equal( res.status, 200 );
				assert.match( res.headers[ 'content-type' ], /^application\/json/ );
				assert.deepEqual( res.body, { count: 9, limit: false } );
			}
		} );

		it( 'Should return 400 for invalid parameter', async () => {
			const res = await client.get( `/page/${ title }/history/counts/editts` );
			assert.equal( res.status, 400 );
		} );

		it( 'Should return 404 for title that does not exist', async () => {
			const title2 = utils.title( 'Random_' );
			const res = await client.get( `/page/${ title2 }/history/counts/edits` );

			assert.equal( res.status, 404 );
		} );

		it( 'Should get total number of edits between revisions, normal order', async () => {
			const fromRev = edits.all[ 1 ].id;
			const toRev = edits.all[ edits.all.length - 2 ].id;
			const res = await client.get( `/page/${ title }/history/counts/edits?from=${ fromRev }&to=${ toRev }` );

			assert.strictEqual( res.status, 200 );
			assert.match( res.headers[ 'content-type' ], /^application\/json/ );
			assert.deepEqual( res.body, { count: 5, limit: false } );
		} );

		it( 'Should get total number of edits between revisions, reverse order', async () => {
			const fromRev = edits.all[ 1 ].id;
			const toRev = edits.all[ edits.all.length - 2 ].id;
			const res = await client.get( `/page/${ title }/history/counts/edits?from=${ toRev }&to=${ fromRev }` );

			assert.strictEqual( res.status, 200 );
			assert.match( res.headers[ 'content-type' ], /^application\/json/ );
			assert.deepEqual( res.body, { count: 5, limit: false } );
		} );

		it( 'Should return 404 for deleted page', async () => {
			await mindy.action( 'delete', { title: titleToDelete, token: await mindy.token() }, 'POST' );
			const { status: editsStatus } = await client.get( `/page/${ titleToDelete }/history/counts/edits` );
			assert.equal( editsStatus, 404 );
		} );
	} );

	describe( 'GET /page/{title}/history/counts/anonymous', () => {
		it( 'Should get total number of anonymous edits', async () => {
			const res = await client.get( `/page/${ title }/history/counts/anonymous` );

			assert.equal( res.status, 200 );
			assert.match( res.headers[ 'content-type' ], /^application\/json/ );
			const expectedCount = autoCreateTempUserEnabled ? 0 : 2;
			assert.deepEqual( res.body, { count: expectedCount, limit: false } );
		} );
	} );

	describe( 'GET /page/{title}/history/counts/temporary', () => {
		it( 'Should get total number of edits by temporary users', async () => {
			const res = await client.get( `/page/${ title }/history/counts/temporary` );

			assert.equal( res.status, 200 );
			assert.match( res.headers[ 'content-type' ], /^application\/json/ );
			const expectedCount = autoCreateTempUserEnabled ? 2 : 0;
			assert.deepEqual( res.body, { count: expectedCount, limit: false } );
		} );
	} );

	describe( 'GET /page/{title}/history/counts/bot', () => {
		it( 'Should get total number of edits by bots', async () => {
			const res = await client.get( `/page/${ title }/history/counts/bot` );

			assert.equal( res.status, 200 );
			assert.match( res.headers[ 'content-type' ], /^application\/json/ );
			assert.deepEqual( res.body, { count: 4, limit: false } );
		} );
	} );

	describe( 'GET /page/{title}/history/counts/reverted', () => {
		it( 'Should get total number of reverted edits', async () => {
			const res = await client.get( `/page/${ title }/history/counts/reverted` );

			assert.equal( res.status, 200 );
			assert.match( res.headers[ 'content-type' ], /^application\/json/ );
			assert.deepEqual( res.body, { count: 3, limit: false } );
		} );
	} );

	describe( 'GET /page/{title}/history/counts/editors', () => {
		it( 'Should return 404 for deleted page', async () => {
			const { status: editorsStatus, header: editorsHeader } = await client.get( `/page/${ titleToDelete }/history/counts/editors` );
			assert.equal( editorsStatus, 404 );
			assert.match( editorsHeader[ 'content-type' ], /^application\/json/ );
		} );

		it( 'Should get total number of unique editors', async () => {
			const res = await client.get( `/page/${ title }/history/counts/editors` );

			assert.equal( res.status, 200 );
			assert.match( res.headers[ 'content-type' ], /^application\/json/ );
			const expectedCount = autoCreateTempUserEnabled ? 5 : 4;
			assert.deepEqual( res.body, { count: expectedCount, limit: false } );
		} );

		it( 'Should get total number of unique editors between revisions, normal order', async () => {
			const fromRev = edits.all[ 1 ].id;
			const toRev = edits.all[ edits.all.length - 2 ].id;
			const res = await client.get( `/page/${ title }/history/counts/editors?from=${ fromRev }&to=${ toRev }` );

			assert.strictEqual( res.status, 200 );
			assert.match( res.headers[ 'content-type' ], /^application\/json/ );
			assert.deepEqual( res.body, { count: 3, limit: false } );
		} );

		it( 'Should get total number of unique editors between revisions, reverse order', async () => {
			const fromRev = edits.all[ 1 ].id;
			const toRev = edits.all[ edits.all.length - 2 ].id;
			const res = await client.get( `/page/${ title }/history/counts/editors?from=${ toRev }&to=${ fromRev }` );

			assert.strictEqual( res.status, 200 );
			assert.match( res.headers[ 'content-type' ], /^application\/json/ );
			assert.deepEqual( res.body, { count: 3, limit: false } );
		} );
	} );

	describe( 'GET page/{title}/history?filter={tag}', () => {
		it( 'Should get all revisions', async () => {
			const res = await client.get( `/page/${ title }/history` );

			assert.equal( res.status, 200 );
			assert.match( res.headers[ 'content-type' ], /^application\/json/ );
			assert.lengthOf( res.body.revisions, edits.all.length );
			res.body.revisions
				.forEach( ( rev, i ) => assert.deepNestedInclude( rev, edits.all[ i ] ) );
			assert.include( res.body.latest, `page/${ title }/history` );

			await assertGetStatus( res.body.latest );
		} );

		it( 'Should get revisions by anonymous users', async () => {
			const res = await client.get( `/page/${ title }/history`, { filter: 'anonymous' } );

			assert.equal( res.status, 200 );
			assert.match( res.headers[ 'content-type' ], /^application\/json/ );
			assert.lengthOf( res.body.revisions, edits.anon.length );
			res.body.revisions
				.forEach( ( rev, i ) => assert.deepNestedInclude( rev, edits.anon[ i ] ) );
			assert.include( res.body.latest, `page/${ title }/history?filter=anonymous` );

			await assertGetStatus( res.body.latest );
		} );

		it( 'Should get revisions by bots', async () => {
			const res = await client.get( `/page/${ title }/history`, { filter: 'bot' } );

			assert.equal( res.status, 200 );
			assert.match( res.headers[ 'content-type' ], /^application\/json/ );
			assert.lengthOf( res.body.revisions, edits.bot.length );
			res.body.revisions
				.forEach( ( rev, i ) => assert.deepNestedInclude( rev, edits.bot[ i ] ) );
			assert.include( res.body.latest, `page/${ title }/history?filter=bot` );
		} );

		it( 'Should get reverted revisions', async () => {
			const res = await client.get( `/page/${ title }/history`, { filter: 'reverted' } );

			assert.equal( res.status, 200 );
			assert.match( res.headers[ 'content-type' ], /^application\/json/ );
			assert.lengthOf( res.body.revisions, edits.reverts.length );
			res.body.revisions
				.forEach( ( rev, i ) => assert.deepNestedInclude( rev, edits.reverts[ i ] ) );
			assert.include( res.body.latest, `page/${ title }/history?filter=reverted` );
		} );

		it( 'Should return 400 for invalid filter parameter', async () => {
			const res = await client.get( `/page/${ title }/history`, { filter: 'anon' } );

			assert.equal( res.status, 400 );
		} );

		it( 'Should return 404 for title that does not exist', async () => {
			const title2 = utils.title( 'Random_' );
			const res = await client.get( `/page/${ title2 }/history`, { filter: 'bot' } );

			assert.equal( res.status, 404 );
		} );

		it( 'Should update cache control headers', async () => {
			const title2 = utils.title( 'Random_' );
			const edit1 = await alice.edit( title2, { text: 'Old Content', summary: 'make page' } );
			const res1a = await client.get( `/page/${ title2 }/history`, { filter: 'bot' } );
			const res1b = await client.get( `/page/${ title2 }/history`, { filter: 'bot' } );

			assert.equal( res1a.headers[ 'last-modified' ], res1b.headers[ 'last-modified' ] );
			assert.equal( res1a.headers.etag, res1b.headers.etag );

			const edit2 = await alice.edit( title2, { text: 'New Content', summary: 'poke page' } );
			const res2 = await client.get( `/page/${ title2 }/history`, { filter: 'bot' } );

			assert.equal( Date.parse( res1a.headers[ 'last-modified' ] ),
				Date.parse( edit1.newtimestamp ) );

			assert.equal( Date.parse( res2.headers[ 'last-modified' ] ),
				Date.parse( edit2.newtimestamp ) );

			assert.notEqual( res1a.headers.etag, res2.headers.etag );
		} );
	} );

	describe( 'GET /page/{title}/history?{older_than|newer_than={id}}', () => {
		it( 'Should get revisions newer than specified id for a page', async () => {
			const { id } = edits.all[ 3 ];
			const expected = edits.all.slice( 0, 3 );
			const res = await client.get( `/page/${ title }/history`, { newer_than: id } );

			assert.equal( res.status, 200 );
			assert.match( res.headers[ 'content-type' ], /^application\/json/ );
			assert.lengthOf( res.body.revisions, expected.length );
			res.body.revisions
				.forEach( ( rev, i ) => assert.deepNestedInclude( rev, expected[ i ] ) );
			assert.include( res.body.latest, `page/${ title }/history` );
			assert.include( res.body.older, `page/${ title }/history?older_than=${ expected[ expected.length - 1 ].id }` );
		} );

		it( 'Should get revisions older than specified id for a page', async () => {
			const { id } = edits.all[ 3 ];
			const expected = edits.all.slice( 4 );
			const res = await client.get( `/page/${ title }/history`, { older_than: id } );

			assert.equal( res.status, 200 );
			assert.match( res.headers[ 'content-type' ], /^application\/json/ );
			assert.lengthOf( res.body.revisions, expected.length );
			res.body.revisions
				.forEach( ( rev, i ) => assert.deepNestedInclude( rev, expected[ i ] ) );
			assert.include( res.body.latest, `page/${ title }/history` );
			assert.include( res.body.newer, `page/${ title }/history?newer_than=${ expected[ 0 ].id }` );

			await assertGetStatus( res.body.newer );
		} );

		it( 'Should get revisions using both filter and newer_than|older_than parameters', async () => {
			const { id } = edits.all[ 3 ];
			const res = await client.get( `/page/${ title }/history`, { newer_than: id, filter: 'bot' } );

			assert.equal( res.status, 200 );
			assert.match( res.headers[ 'content-type' ], /^application\/json/ );
			assert.lengthOf( res.body.revisions, 2 );
			res.body.revisions
				.forEach( ( rev, i ) => assert.deepNestedInclude( rev, edits.bot[ i ] ) );
			assert.include( res.body.latest, `page/${ title }/history?filter=bot` );
			assert.include( res.body.older, `page/${ title }/history?filter=bot&older_than=${ edits.bot[ 1 ].id }` );

			await assertGetStatus( res.body.older );
		} );

		it( 'Should return 400 for revision id less than 0 ', async () => {
			const res = await client.get( `/page/${ title }/history`, { newer_than: -1 } );

			assert.equal( res.status, 400 );
		} );

		it( 'Should return 400 when using both newer_than and older_than', async () => {
			const id1 = edits.all[ 8 ].id;
			const id2 = edits.all[ 2 ].id;
			const res = await client.get( `/page/${ title }/history`, { newer_than: id1, older_than: id2 } );

			assert.equal( res.status, 400 );
		} );

		it( 'Should return 404 for a revision that does not exist for a specified page', async () => {
			const anon2 = action.getAnon();
			const title2 = utils.title( 'AnotherPage' );
			const edit = await anon2.edit( title2, { text: 'Hello world' } );
			const res = await client.get( `/page/${ title }/history`, { newer_than: edit.newrevid } );

			assert.equal( res.status, 404 );
		} );
	} );
} );
