import { integer, pgSequence, pgTable } from 'drizzle-orm/pg-core';
import { expect, test } from 'vitest';
import { diffTestSchemas } from './schemaDiffer';

// same table - no diff
// 2. identity always/by default - no params +
// 3. identity always/by default - with a few params +
// 4. identity always/by default - with all params +

// diff table with create statement
// 2. identity always/by default - no params +
// 3. identity always/by default - with a few params +
// 4. identity always/by default - with all params +

// diff for drop statement
// 2. identity always/by default - no params, with params +

// diff for alters
// 2. identity always/by default - no params -> add param +
// 3. identity always/by default - with a few params - remove/add/change params +
// 4. identity always/by default - with all params - remove/add/change params +

test('create table: identity always/by default - no params', async () => {
	const from = {};

	const to = {
		users: pgTable('users', {
			id: integer('id').generatedByDefaultAsIdentity(),
		}),
	};

	const { statements, sqlStatements } = await diffTestSchemas(from, to, []);

	expect(statements).toStrictEqual([
		{
			columns: [
				{
					identity: 'users_id_seq;byDefault;1;2147483647;1;1;1;false',
					name: 'id',
					notNull: true,
					primaryKey: false,
					type: 'integer',
				},
			],
			compositePKs: [],
			compositePkName: '',
			schema: '',
			policies: [],
			isRLSEnabled: false,
			tableName: 'users',
			type: 'create_table',
			uniqueConstraints: [],
			checkConstraints: [],
		},
	]);
	expect(sqlStatements).toStrictEqual([
		'CREATE TABLE "users" (\n\t"id" integer GENERATED BY DEFAULT AS IDENTITY (sequence name "users_id_seq" INCREMENT BY 1 MINVALUE 1 MAXVALUE 2147483647 START WITH 1 CACHE 1)\n);\n',
	]);
});

test('create table: identity always/by default - few params', async () => {
	const from = {};

	const to = {
		users: pgTable('users', {
			id: integer('id').generatedByDefaultAsIdentity({
				name: 'custom_seq',
				increment: 4,
			}),
		}),
	};

	const { statements, sqlStatements } = await diffTestSchemas(from, to, []);

	expect(statements).toStrictEqual([
		{
			columns: [
				{
					identity: 'custom_seq;byDefault;1;2147483647;4;1;1;false',
					name: 'id',
					notNull: true,
					primaryKey: false,
					type: 'integer',
				},
			],
			compositePKs: [],
			compositePkName: '',
			policies: [],
			schema: '',
			isRLSEnabled: false,
			tableName: 'users',
			type: 'create_table',
			uniqueConstraints: [],
			checkConstraints: [],
		},
	]);
	expect(sqlStatements).toStrictEqual([
		'CREATE TABLE "users" (\n\t"id" integer GENERATED BY DEFAULT AS IDENTITY (sequence name "custom_seq" INCREMENT BY 4 MINVALUE 1 MAXVALUE 2147483647 START WITH 1 CACHE 1)\n);\n',
	]);
});

test('create table: identity always/by default - all params', async () => {
	const from = {};

	const to = {
		users: pgTable('users', {
			id: integer('id').generatedByDefaultAsIdentity({
				name: 'custom_seq',
				increment: 4,
				minValue: 3,
				maxValue: 1000,
				cache: 200,
				cycle: false,
			}),
		}),
	};

	const { statements, sqlStatements } = await diffTestSchemas(from, to, []);

	expect(statements).toStrictEqual([
		{
			columns: [
				{
					identity: 'custom_seq;byDefault;3;1000;4;3;200;false',
					name: 'id',
					notNull: true,
					primaryKey: false,
					type: 'integer',
				},
			],
			compositePKs: [],
			compositePkName: '',
			policies: [],
			isRLSEnabled: false,
			schema: '',
			tableName: 'users',
			type: 'create_table',
			uniqueConstraints: [],
			checkConstraints: [],
		},
	]);
	expect(sqlStatements).toStrictEqual([
		'CREATE TABLE "users" (\n\t"id" integer GENERATED BY DEFAULT AS IDENTITY (sequence name "custom_seq" INCREMENT BY 4 MINVALUE 3 MAXVALUE 1000 START WITH 3 CACHE 200)\n);\n',
	]);
});

test('no diff: identity always/by default - no params', async () => {
	const from = {
		users: pgTable('users', {
			id: integer('id').generatedByDefaultAsIdentity(),
		}),
	};

	const to = {
		users: pgTable('users', {
			id: integer('id').generatedByDefaultAsIdentity(),
		}),
	};

	const { statements, sqlStatements } = await diffTestSchemas(from, to, []);

	expect(statements).toStrictEqual([]);
	expect(sqlStatements).toStrictEqual([]);
});

test('no diff: identity always/by default - few params', async () => {
	const from = {
		users: pgTable('users', {
			id: integer('id').generatedByDefaultAsIdentity({
				name: 'custom_seq',
				increment: 4,
			}),
		}),
	};

	const to = {
		users: pgTable('users', {
			id: integer('id').generatedByDefaultAsIdentity({
				name: 'custom_seq',
				increment: 4,
			}),
		}),
	};

	const { statements, sqlStatements } = await diffTestSchemas(from, to, []);

	expect(statements).toStrictEqual([]);
	expect(sqlStatements).toStrictEqual([]);
});

test('no diff: identity always/by default - all params', async () => {
	const from = {
		users: pgTable('users', {
			id: integer('id').generatedByDefaultAsIdentity({
				name: 'custom_seq',
				increment: 4,
				minValue: 3,
				maxValue: 1000,
				cache: 200,
				cycle: false,
			}),
		}),
	};

	const to = {
		users: pgTable('users', {
			id: integer('id').generatedByDefaultAsIdentity({
				name: 'custom_seq',
				increment: 4,
				minValue: 3,
				maxValue: 1000,
				cache: 200,
				cycle: false,
			}),
		}),
	};

	const { statements, sqlStatements } = await diffTestSchemas(from, to, []);

	expect(statements).toStrictEqual([]);
	expect(sqlStatements).toStrictEqual([]);
});

test('drop identity from a column - no params', async () => {
	const from = {
		users: pgTable('users', {
			id: integer('id').generatedByDefaultAsIdentity(),
		}),
	};

	const to = {
		users: pgTable('users', {
			id: integer('id'),
		}),
	};

	const { statements, sqlStatements } = await diffTestSchemas(from, to, []);

	expect(statements).toStrictEqual([
		{
			columnName: 'id',
			schema: '',
			tableName: 'users',
			type: 'alter_table_alter_column_drop_identity',
		},
	]);
	expect(sqlStatements).toStrictEqual([
		`ALTER TABLE \"users\" ALTER COLUMN \"id\" DROP IDENTITY;`,
	]);
});

test('drop identity from a column - few params', async () => {
	const from = {
		users: pgTable('users', {
			id: integer('id').generatedByDefaultAsIdentity({
				startWith: 100,
				increment: 3,
			}),
		}),
	};

	const to = {
		users: pgTable('users', {
			id: integer('id'),
		}),
	};

	const { statements, sqlStatements } = await diffTestSchemas(from, to, []);

	expect(statements).toStrictEqual([
		{
			columnName: 'id',
			schema: '',
			tableName: 'users',
			type: 'alter_table_alter_column_drop_identity',
		},
	]);
	expect(sqlStatements).toStrictEqual([
		`ALTER TABLE \"users\" ALTER COLUMN \"id\" DROP IDENTITY;`,
	]);
});

test('drop identity from a column - all params', async () => {
	const from = {
		users: pgTable('users', {
			id: integer('id').generatedByDefaultAsIdentity({
				startWith: 100,
				increment: 3,
				cache: 100,
				cycle: true,
			}),
		}),
	};

	const to = {
		users: pgTable('users', {
			id: integer('id'),
		}),
	};

	const { statements, sqlStatements } = await diffTestSchemas(from, to, []);

	expect(statements).toStrictEqual([
		{
			columnName: 'id',
			schema: '',
			tableName: 'users',
			type: 'alter_table_alter_column_drop_identity',
		},
	]);
	expect(sqlStatements).toStrictEqual([
		`ALTER TABLE \"users\" ALTER COLUMN \"id\" DROP IDENTITY;`,
	]);
});

test('alter identity from a column - no params', async () => {
	const from = {
		users: pgTable('users', {
			id: integer('id').generatedByDefaultAsIdentity(),
		}),
	};

	const to = {
		users: pgTable('users', {
			id: integer('id').generatedByDefaultAsIdentity({ startWith: 100 }),
		}),
	};

	const { statements, sqlStatements } = await diffTestSchemas(from, to, []);

	expect(statements).toStrictEqual([
		{
			columnName: 'id',
			identity: 'users_id_seq;byDefault;1;2147483647;1;100;1;false',
			oldIdentity: 'users_id_seq;byDefault;1;2147483647;1;1;1;false',
			schema: '',
			tableName: 'users',
			type: 'alter_table_alter_column_change_identity',
		},
	]);
	expect(sqlStatements).toStrictEqual([
		'ALTER TABLE "users" ALTER COLUMN "id" SET START WITH 100;',
	]);
});

test('alter identity from a column - few params', async () => {
	const from = {
		users: pgTable('users', {
			id: integer('id').generatedByDefaultAsIdentity({ startWith: 100 }),
		}),
	};

	const to = {
		users: pgTable('users', {
			id: integer('id').generatedByDefaultAsIdentity({
				startWith: 100,
				cache: 10,
			}),
		}),
	};

	const { statements, sqlStatements } = await diffTestSchemas(from, to, []);

	expect(statements).toStrictEqual([
		{
			columnName: 'id',
			identity: 'users_id_seq;byDefault;1;2147483647;1;100;10;false',
			oldIdentity: 'users_id_seq;byDefault;1;2147483647;1;100;1;false',
			schema: '',
			tableName: 'users',
			type: 'alter_table_alter_column_change_identity',
		},
	]);
	expect(sqlStatements).toStrictEqual([
		'ALTER TABLE "users" ALTER COLUMN "id" SET CACHE 10;',
	]);
});

test('alter identity from a column - by default to always', async () => {
	const from = {
		users: pgTable('users', {
			id: integer('id').generatedByDefaultAsIdentity(),
		}),
	};

	const to = {
		users: pgTable('users', {
			id: integer('id').generatedAlwaysAsIdentity({
				startWith: 100,
				cache: 10,
			}),
		}),
	};

	const { statements, sqlStatements } = await diffTestSchemas(from, to, []);

	expect(statements).toStrictEqual([
		{
			columnName: 'id',
			identity: 'users_id_seq;always;1;2147483647;1;100;10;false',
			oldIdentity: 'users_id_seq;byDefault;1;2147483647;1;1;1;false',
			schema: '',
			tableName: 'users',
			type: 'alter_table_alter_column_change_identity',
		},
	]);
	expect(sqlStatements).toStrictEqual([
		'ALTER TABLE "users" ALTER COLUMN "id" SET GENERATED ALWAYS;',
		'ALTER TABLE "users" ALTER COLUMN "id" SET START WITH 100;',
		'ALTER TABLE "users" ALTER COLUMN "id" SET CACHE 10;',
	]);
});

test('alter identity from a column - always to by default', async () => {
	const from = {
		users: pgTable('users', {
			id: integer('id').generatedAlwaysAsIdentity(),
		}),
	};

	const to = {
		users: pgTable('users', {
			id: integer('id').generatedByDefaultAsIdentity({
				startWith: 100,
				cache: 10,
			}),
		}),
	};

	const { statements, sqlStatements } = await diffTestSchemas(from, to, []);

	expect(statements).toStrictEqual([
		{
			columnName: 'id',
			identity: 'users_id_seq;byDefault;1;2147483647;1;100;10;false',
			oldIdentity: 'users_id_seq;always;1;2147483647;1;1;1;false',
			schema: '',
			tableName: 'users',
			type: 'alter_table_alter_column_change_identity',
		},
	]);
	expect(sqlStatements).toStrictEqual([
		'ALTER TABLE "users" ALTER COLUMN "id" SET GENERATED BY DEFAULT;',
		'ALTER TABLE "users" ALTER COLUMN "id" SET START WITH 100;',
		'ALTER TABLE "users" ALTER COLUMN "id" SET CACHE 10;',
	]);
});