/**
 * The contents of this file are subject to the license and copyright
 * detailed in the LICENSE and NOTICE files at the root of the source
 * tree and available online at
 *
 * http://www.dspace.org/license/
 */
import {
  ESLintUtils,
  TSESTree,
} from '@typescript-eslint/utils';
import { RuleContext } from '@typescript-eslint/utils/ts-eslint';

import { fixture } from '../../../test/fixture';
import {
  removeWithCommas,
  replaceOrRemoveArrayIdentifier,
} from '../../util/fix';
import { DSpaceESLintRuleInfo } from '../../util/structure';
import {
  allThemeableComponents,
  DISALLOWED_THEME_SELECTORS,
  fixSelectors,
  getThemeableComponentByBaseClass,
  isAllowedUnthemedUsage,
} from '../../util/theme-support';
import {
  findImportSpecifier,
  findUsages,
  findUsagesByName,
  getFilename,
  relativePath,
} from '../../util/typescript';

export enum Message {
  WRONG_CLASS = 'mustUseThemedWrapperClass',
  WRONG_IMPORT = 'mustImportThemedWrapper',
  WRONG_SELECTOR = 'mustUseThemedWrapperSelector',
  BASE_IN_MODULE = 'baseComponentNotNeededInModule',
}

export const info = {
  name: 'themed-component-usages',
  meta: {
    docs: {
      description: `Themeable components should be used via their \`ThemedComponent\` wrapper class

This ensures that custom themes can correctly override _all_ instances of this component.
There are a few exceptions where the base class can still be used:
- Class declaration expressions (otherwise we can't declare, extend or override the class in the first place)
- Angular modules (except for routing modules)
- Angular \`@ViewChild\` decorators
- Type annotations
      `,
    },
    type: 'problem',
    schema: [],
    fixable: 'code',
    messages: {
      [Message.WRONG_CLASS]: 'Themeable components should be used via their ThemedComponent wrapper',
      [Message.WRONG_IMPORT]: 'Themeable components should be used via their ThemedComponent wrapper',
      [Message.WRONG_SELECTOR]: 'Themeable components should be used via their ThemedComponent wrapper',
      [Message.BASE_IN_MODULE]: 'Base themeable components shouldn\'t be declared in modules',
    },
  },
  defaultOptions: [],
} as DSpaceESLintRuleInfo;

export const rule = ESLintUtils.RuleCreator.withoutDocs({
  ...info,
  create(context: RuleContext<Message, unknown[]>) {
    const filename = getFilename(context);

    function handleUnthemedUsagesInTypescript(node: TSESTree.Identifier) {
      if (isAllowedUnthemedUsage(node)) {
        return;
      }

      const entry = getThemeableComponentByBaseClass(node.name);

      if (entry === undefined) {
        // this should never happen
        throw new Error(`No such themeable component in registry: '${node.name}'`);
      }

      context.report({
        messageId: Message.WRONG_CLASS,
        node: node,
        fix(fixer) {
          if (node.parent.type === TSESTree.AST_NODE_TYPES.ArrayExpression) {
            return replaceOrRemoveArrayIdentifier(context, fixer, node, entry.wrapperClass);
          } else {
            return fixer.replaceText(node, entry.wrapperClass);
          }
        },
      });
    }

    function handleThemedSelectorQueriesInTests(node: TSESTree.Literal) {
      context.report({
        node,
        messageId: Message.WRONG_SELECTOR,
        fix(fixer){
          const newSelector = fixSelectors(node.raw);
          return fixer.replaceText(node, newSelector);
        },
      });
    }

    function handleUnthemedImportsInTypescript(specifierNode: TSESTree.ImportSpecifier) {
      const allUsages = findUsages(context, specifierNode.local);
      const badUsages = allUsages.filter(usage => !isAllowedUnthemedUsage(usage));

      if (badUsages.length === 0) {
        return;
      }

      const importedNode = specifierNode.imported;
      const declarationNode = specifierNode.parent as TSESTree.ImportDeclaration;

      const entry = getThemeableComponentByBaseClass(importedNode.name);
      if (entry === undefined) {
        // this should never happen
        throw new Error(`No such themeable component in registry: '${importedNode.name}'`);
      }

      context.report({
        messageId: Message.WRONG_IMPORT,
        node: importedNode,
        fix(fixer) {
          const ops = [];

          const wrapperImport = findImportSpecifier(context, entry.wrapperClass);

          if (findUsagesByName(context, entry.wrapperClass).length === 0) {
            // Wrapper is not present in this file, safe to add import

            const newImportLine = `import { ${entry.wrapperClass} } from '${relativePath(filename, entry.wrapperPath)}';`;

            if (declarationNode.specifiers.length === 1) {
              if (allUsages.length === badUsages.length) {
                ops.push(fixer.replaceText(declarationNode, newImportLine));
              } else if (wrapperImport === undefined) {
                ops.push(fixer.insertTextAfter(declarationNode, '\n' + newImportLine));
              }
            } else {
              ops.push(...removeWithCommas(context, fixer, specifierNode));
              if (wrapperImport === undefined) {
                ops.push(fixer.insertTextAfter(declarationNode, '\n' + newImportLine));
              }
            }
          } else {
            // Wrapper already present in the file, remove import instead

            if (allUsages.length === badUsages.length) {
              if (declarationNode.specifiers.length === 1) {
                // Make sure we remove the newline as well
                ops.push(fixer.removeRange([declarationNode.range[0], declarationNode.range[1] + 1]));
              } else {
                ops.push(...removeWithCommas(context, fixer, specifierNode));
              }
            }
          }

          return ops;
        },
      });
    }

    // ignore tests and non-routing modules
    if (filename.endsWith('.spec.ts')) {
      return {
        [`CallExpression[callee.object.name = "By"][callee.property.name = "css"] > Literal:first-child[value = /.*${DISALLOWED_THEME_SELECTORS}.*/]`]: handleThemedSelectorQueriesInTests,
      };
    } else if (filename.endsWith('.cy.ts')) {
      return {
        [`CallExpression[callee.object.name = "cy"][callee.property.name = "get"] > Literal:first-child[value = /.*${DISALLOWED_THEME_SELECTORS}.*/]`]: handleThemedSelectorQueriesInTests,
      };
    } else if (
      filename.match(/(?!src\/themes\/).*(?!routing).module.ts$/)
      || filename.match(/themed-.+\.component\.ts$/)
    ) {
      // do nothing
      return {};
    } else {
      return allThemeableComponents().reduce(
        (rules, entry) => {
          return {
            ...rules,
            [`:not(:matches(ClassDeclaration, ImportSpecifier)) > Identifier[name = "${entry.baseClass}"]`]: handleUnthemedUsagesInTypescript,
            [`ImportSpecifier[imported.name = "${entry.baseClass}"]`]: handleUnthemedImportsInTypescript,
          };
        }, {},
      );
    }

  },
});

export const tests = {
  plugin: info.name,
  valid: [
    {
      name: 'allow wrapper class usages',
      code: `
import { ThemedTestThemeableComponent } from './app/test/themed-test-themeable.component';

const config = {
  a: ThemedTestThemeableComponent,
  b: ChipsComponent,
}
        `,
    },
    {
      name: 'allow base class in class declaration',
      code: `
export class TestThemeableComponent {
}
        `,
    },
    {
      name: 'allow inheriting from base class',
      code: `
import { TestThemeableComponent } from './app/test/test-themeable.component';

export class ThemedAdminSidebarComponent extends ThemedComponent<TestThemeableComponent> {
}
        `,
    },
    {
      name: 'allow base class in ViewChild',
      code: `
import { TestThemeableComponent } from './app/test/test-themeable.component';

export class Something {
  @ViewChild(TestThemeableComponent) test: TestThemeableComponent;
}
        `,
    },
    {
      name: 'allow wrapper selectors in test queries',
      filename: fixture('src/app/test/test.component.spec.ts'),
      code: `
By.css('ds-themeable');
By.css('#test > ds-themeable > #nest');
        `,
    },
    {
      name: 'allow wrapper selectors in cypress queries',
      filename: fixture('src/app/test/test.component.cy.ts'),
      code: `
By.css('ds-themeable');
By.css('#test > ds-themeable > #nest');
        `,
    },
  ],
  invalid: [
    {
      name: 'disallow direct usages of base class',
      code: `
import { TestThemeableComponent } from './app/test/test-themeable.component';
import { TestComponent } from './app/test/test.component';

const config = {
  a: TestThemeableComponent,
  b: TestComponent,
}
        `,
      errors: [
        {
          messageId: Message.WRONG_IMPORT,
        },
        {
          messageId: Message.WRONG_CLASS,
        },
      ],
      output: `
import { ThemedTestThemeableComponent } from './app/test/themed-test-themeable.component';
import { TestComponent } from './app/test/test.component';

const config = {
  a: ThemedTestThemeableComponent,
  b: TestComponent,
}
        `,
    },
    {
      name: 'disallow direct usages of base class, keep other imports',
      code: `
import { Something, TestThemeableComponent } from './app/test/test-themeable.component';
import { TestComponent } from './app/test/test.component';

const config = {
  a: TestThemeableComponent,
  b: TestComponent,
  c: Something,
}
        `,
      errors: [
        {
          messageId: Message.WRONG_IMPORT,
        },
        {
          messageId: Message.WRONG_CLASS,
        },
      ],
      output: `
import { Something } from './app/test/test-themeable.component';
import { ThemedTestThemeableComponent } from './app/test/themed-test-themeable.component';
import { TestComponent } from './app/test/test.component';

const config = {
  a: ThemedTestThemeableComponent,
  b: TestComponent,
  c: Something,
}
        `,
    },
    {
      name: 'handle array replacements correctly',
      code: `
const DECLARATIONS = [
  Something,
  TestThemeableComponent,
  Something,
  ThemedTestThemeableComponent,
];
        `,
      errors: [
        {
          messageId: Message.WRONG_CLASS,
        },
      ],
      output: `
const DECLARATIONS = [
  Something,
  Something,
  ThemedTestThemeableComponent,
];
        `,
    },
    {
      name: 'disallow override selector in test queries',
      filename: fixture('src/app/test/test.component.spec.ts'),
      code: `
By.css('ds-themed-themeable');
By.css('#test > ds-themed-themeable > #nest');
        `,
      errors: [
        {
          messageId: Message.WRONG_SELECTOR,
        },
        {
          messageId: Message.WRONG_SELECTOR,
        },
      ],
      output: `
By.css('ds-themeable');
By.css('#test > ds-themeable > #nest');
        `,
    },
    {
      name: 'disallow base selector in test queries',
      filename: fixture('src/app/test/test.component.spec.ts'),
      code: `
By.css('ds-base-themeable');
By.css('#test > ds-base-themeable > #nest');
        `,
      errors: [
        {
          messageId: Message.WRONG_SELECTOR,
        },
        {
          messageId: Message.WRONG_SELECTOR,
        },
      ],
      output: `
By.css('ds-themeable');
By.css('#test > ds-themeable > #nest');
        `,
    },
    {
      name: 'disallow override selector in cypress queries',
      filename: fixture('src/app/test/test.component.cy.ts'),
      code: `
cy.get('ds-themed-themeable');
cy.get('#test > ds-themed-themeable > #nest');
        `,
      errors: [
        {
          messageId: Message.WRONG_SELECTOR,
        },
        {
          messageId: Message.WRONG_SELECTOR,
        },
      ],
      output: `
cy.get('ds-themeable');
cy.get('#test > ds-themeable > #nest');
        `,
    },
    {
      name: 'disallow base selector in cypress queries',
      filename: fixture('src/app/test/test.component.cy.ts'),
      code: `
cy.get('ds-base-themeable');
cy.get('#test > ds-base-themeable > #nest');
        `,
      errors: [
        {
          messageId: Message.WRONG_SELECTOR,
        },
        {
          messageId: Message.WRONG_SELECTOR,
        },
      ],
      output: `
cy.get('ds-themeable');
cy.get('#test > ds-themeable > #nest');
        `,
    },
    {
      name: 'edge case: unable to find usage node through usage token, but import is still flagged and fixed',
      filename: fixture('src/themes/test/app/test/other-themeable.component.ts'),
      code: `
import { Component } from '@angular/core';

import { Context } from './app/core/shared/context.model';
import { TestThemeableComponent } from '../../../../app/test/test-themeable.component';

@Component({
  standalone: true,
  imports: [TestThemeableComponent],
})
export class UsageComponent {
}
      `,
      errors: [
        {
          messageId: Message.WRONG_IMPORT,
        },
        {
          messageId: Message.WRONG_CLASS,
        },
      ],
      output: `
import { Component } from '@angular/core';

import { Context } from './app/core/shared/context.model';
import { ThemedTestThemeableComponent } from '../../../../app/test/themed-test-themeable.component';

@Component({
  standalone: true,
  imports: [ThemedTestThemeableComponent],
})
export class UsageComponent {
}
      `,
    },
    {
      name: 'edge case edge case: both are imported, only wrapper is retained',
      filename: fixture('src/themes/test/app/test/other-themeable.component.ts'),
      code: `
import { Component } from '@angular/core';

import { Context } from './app/core/shared/context.model';
import { TestThemeableComponent } from '../../../../app/test/test-themeable.component';
import { ThemedTestThemeableComponent } from '../../../../app/test/themed-test-themeable.component';

@Component({
  standalone: true,
  imports: [TestThemeableComponent, ThemedTestThemeableComponent],
})
export class UsageComponent {
}
      `,
      errors: [
        {
          messageId: Message.WRONG_IMPORT,
        },
        {
          messageId: Message.WRONG_CLASS,
        },
      ],
      output: `
import { Component } from '@angular/core';

import { Context } from './app/core/shared/context.model';
import { ThemedTestThemeableComponent } from '../../../../app/test/themed-test-themeable.component';

@Component({
  standalone: true,
  imports: [ThemedTestThemeableComponent],
})
export class UsageComponent {
}
      `,
    },
  ],
};

export default rule;