/**
 * Copyright (c) 2020-present, Goldman Sachs
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import {
  type TestAssertion,
  type AssertionStatus,
  type ValueSpecification,
  AssertFail,
  type TestResult,
  TestExecuted,
  TestError,
  EqualToJson,
  ExternalFormatData,
  EqualToJsonAssertFail,
  MultiExecutionServiceTestResult,
  AssertPass,
  TestExecutionStatus,
  EqualTo,
  observe_ValueSpecification,
} from '@finos/legend-graph';
import {
  type GeneratorFn,
  ActionState,
  assertErrorThrown,
  ContentType,
  UnsupportedOperationError,
  assertTrue,
  isNonNullable,
  IllegalStateError,
  guaranteeNonNullable,
  guaranteeType,
  returnUndefOnError,
  type PlainObject,
} from '@finos/legend-shared';
import { action, flow, flowResult, makeObservable, observable } from 'mobx';
import type { EditorStore } from '../../../EditorStore.js';
import { externalFormatData_setData } from '../../../../graph-modifier/DSL_Data_GraphModifierHelper.js';
import {
  getTestableResultFromAssertionStatus,
  TESTABLE_RESULT,
} from '../../../sidebar-state/testable/GlobalTestRunnerState.js';
import type { TestableTestEditorState } from './TestableEditorState.js';
import { isTestPassing } from '../../../utils/TestableUtils.js';
import { equalTo_setExpected } from '../../../../graph-modifier/Testable_GraphModifierHelper.js';

export enum TEST_ASSERTION_TAB {
  EXPECTED = 'EXPECTED',
  RESULT = 'RESULT',
}

export abstract class TestAssertionStatusState {
  resultState: TestAssertionResultState;
  status: AssertionStatus;

  constructor(resultState: TestAssertionResultState, status: AssertionStatus) {
    this.resultState = resultState;
    this.status = status;
  }
}

export class AssertFailState extends TestAssertionStatusState {
  declare status: AssertFail;

  constructor(resultState: TestAssertionResultState, status: AssertFail) {
    super(resultState, status);
    this.status = status;
    makeObservable(this, {
      status: observable,
    });
  }
}

export class EqualToJsonAssertFailState extends AssertFailState {
  declare status: EqualToJsonAssertFail;
  diffModal = false;

  constructor(
    resultState: TestAssertionResultState,
    status: EqualToJsonAssertFail,
  ) {
    super(resultState, status);
    this.status = status;
    makeObservable(this, {
      diffModal: observable,
      setDiffModal: action,
    });
  }

  setDiffModal(val: boolean): void {
    this.diffModal = val;
  }
}

export class UnsupportedAssertionStatusState extends TestAssertionStatusState {}

export class TestAssertionResultState {
  testResult: TestResult | undefined;
  statusState:
    | TestAssertionStatusState
    | Map<string, TestAssertionResultState>
    | undefined;
  readonly editorStore: EditorStore;
  readonly assertionState: TestAssertionEditorState;
  constructor(
    editorStore: EditorStore,
    assertionState: TestAssertionEditorState,
  ) {
    makeObservable(this, {
      testResult: observable,
      setTestResult: action,
      statusState: observable,
    });
    this.editorStore = editorStore;
    this.assertionState = assertionState;
  }

  setTestResult(val: TestResult | undefined): void {
    this.testResult = val;
    this.statusState = undefined;
    if (val instanceof TestExecuted) {
      const status = val.assertStatuses.find(
        (_status) => _status.assertion === this.assertionState.assertion,
      );
      this.statusState = this.buildStatus(status);
    } else if (val instanceof MultiExecutionServiceTestResult) {
      const statusMap = new Map<string, TestAssertionResultState>();
      Array.from(val.keyIndexedTestResults.entries()).forEach((keyedResult) => {
        const resultState = new TestAssertionResultState(
          this.editorStore,
          this.assertionState,
        );
        resultState.setTestResult(keyedResult[1]);
        statusMap.set(keyedResult[0], resultState);
      });
      this.statusState = statusMap;
    }
  }

  buildStatus(
    val: AssertionStatus | undefined,
  ): TestAssertionStatusState | undefined {
    if (val) {
      if (val instanceof EqualToJsonAssertFail) {
        return new EqualToJsonAssertFailState(this, val);
      }
      if (val instanceof AssertFail) {
        return new AssertFailState(this, val);
      }
      return new UnsupportedAssertionStatusState(this, val);
    }
    return undefined;
  }

  get result(): TESTABLE_RESULT {
    if (this.assertionState.testState.runningTestAction.isInProgress) {
      return TESTABLE_RESULT.IN_PROGRESS;
    }
    if (this.testResult instanceof TestError) {
      return TESTABLE_RESULT.ERROR;
    } else if (
      this.testResult instanceof TestExecuted &&
      this.testResult.testExecutionStatus === TestExecutionStatus.PASS
    ) {
      return TESTABLE_RESULT.PASSED;
    } else if (
      this.testResult instanceof TestExecuted &&
      this.testResult.testExecutionStatus === TestExecutionStatus.FAIL &&
      this.statusState instanceof TestAssertionStatusState
    ) {
      return getTestableResultFromAssertionStatus(this.statusState.status);
    } else if (this.testResult instanceof MultiExecutionServiceTestResult) {
      const passed = Array.from(
        this.testResult.keyIndexedTestResults.entries(),
      ).every((keyResult) => {
        const result = keyResult[1];
        if (
          result instanceof TestExecuted &&
          result.testExecutionStatus === TestExecutionStatus.PASS
        ) {
          return true;
        }
        if (
          result instanceof TestExecuted &&
          result.testExecutionStatus === TestExecutionStatus.FAIL
        ) {
          const status = result.assertStatuses.find(
            (_status) => _status.assertion === this.assertionState.assertion,
          );
          if (status instanceof AssertPass) {
            return true;
          }
        }
        return false;
      });
      if (passed) {
        return TESTABLE_RESULT.PASSED;
      }
      const assertionErrors = Array.from(
        this.testResult.keyIndexedTestResults.values(),
      ).find((t) => t instanceof TestError);
      if (assertionErrors) {
        return TESTABLE_RESULT.ERROR;
      }
      return TESTABLE_RESULT.FAILED;
    }
    return TESTABLE_RESULT.DID_NOT_RUN;
  }
}
export abstract class TestAssertionState {
  readonly editorStore: EditorStore;
  assertion: TestAssertion;
  result: TestAssertionResultState;

  constructor(
    editorStore: EditorStore,
    assertionState: TestAssertionEditorState,
  ) {
    this.editorStore = editorStore;
    this.assertion = assertionState.assertion;
    this.result = new TestAssertionResultState(editorStore, assertionState);
  }

  abstract generateExpected(status: AssertFail): boolean;

  abstract generateBare(): TestAssertion;

  abstract label(): string;

  abstract get supportsGeneratingAssertion(): boolean;
}

export class EqualToJsonAssertionState extends TestAssertionState {
  declare assertion: EqualToJson;

  setExpectedValue(val: string): void {
    externalFormatData_setData(this.assertion.expected, val);
  }

  override get supportsGeneratingAssertion(): boolean {
    return true;
  }

  generateExpected(status: AssertFail): boolean {
    if (status instanceof EqualToJsonAssertFail) {
      const expected = status.actual;
      this.setExpectedValue(expected);
      return true;
    }
    return false;
  }
  generateBare(): TestAssertion {
    const bareAssertion = new EqualToJson();
    bareAssertion.expected = new ExternalFormatData();
    bareAssertion.expected.contentType = ContentType.APPLICATION_JSON;
    bareAssertion.expected.data = '';
    return bareAssertion;
  }

  label(): string {
    return 'EqualToJSON';
  }
}

export class EqualToAssertionState extends TestAssertionState {
  declare assertion: EqualTo;
  valueSpec: ValueSpecification;

  constructor(
    editorStore: EditorStore,
    assertionState: TestAssertionEditorState,
    valueSpec: ValueSpecification,
  ) {
    super(editorStore, assertionState);
    makeObservable(this, {
      valueSpec: observable,
      assertion: observable,
      updateValueSpec: action,
    });
    this.valueSpec = observe_ValueSpecification(
      valueSpec,
      this.editorStore.changeDetectionState.observerContext,
    );
  }

  updateValueSpec(val: ValueSpecification): void {
    this.valueSpec = observe_ValueSpecification(
      val,
      this.editorStore.changeDetectionState.observerContext,
    );
    const object =
      this.editorStore.graphManagerState.graphManager.serializeValueSpecification(
        val,
      );
    equalTo_setExpected(this.assertion, object);
  }

  override generateExpected(status: AssertFail): boolean {
    throw new Error('Method not implemented.');
  }
  override generateBare(): TestAssertion {
    const equal = new EqualTo();
    equal.expected = {};
    return equal;
  }
  override label(): string {
    return 'Equal To';
  }
  override get supportsGeneratingAssertion(): boolean {
    return false;
  }
}

export class UnsupportedAssertionState extends TestAssertionState {
  override get supportsGeneratingAssertion(): boolean {
    return false;
  }
  generateBare(): TestAssertion {
    throw new UnsupportedOperationError();
  }
  generateExpected(status: AssertFail): boolean {
    return false;
  }

  label(): string {
    return 'Unsupported';
  }
}

export class TestAssertionEditorState {
  readonly editorStore: EditorStore;
  readonly testState: TestableTestEditorState;
  assertionState: TestAssertionState;
  assertionResultState: TestAssertionResultState;
  assertion: TestAssertion;
  selectedTab = TEST_ASSERTION_TAB.EXPECTED;
  generatingExpectedAction = ActionState.create();
  constructor(
    editorStore: EditorStore,
    assertion: TestAssertion,
    testState: TestableTestEditorState,
  ) {
    makeObservable(this, {
      selectedTab: observable,
      assertionResultState: observable,
      setSelectedTab: action,
      generateExpected: flow,
    });
    this.editorStore = editorStore;
    this.assertion = assertion;
    this.testState = testState;
    this.assertionState = this.buildAssertionState(assertion);
    this.assertionResultState = new TestAssertionResultState(editorStore, this);
  }

  setSelectedTab(val: TEST_ASSERTION_TAB): void {
    this.selectedTab = val;
  }

  *generateExpected(): GeneratorFn<void> {
    try {
      assertTrue(
        this.assertionState.supportsGeneratingAssertion,
        'Assertion does not support generation',
      );
      this.generatingExpectedAction.inProgress();
      const result = (yield flowResult(
        this.testState.fetchTestResult(),
      )) as TestResult;
      let testExecuted: TestExecuted;
      if (result instanceof TestExecuted) {
        testExecuted = result;
      } else if (result instanceof MultiExecutionServiceTestResult) {
        testExecuted = guaranteeNonNullable(
          Array.from(result.keyIndexedTestResults.values())
            .map((testResult) => {
              if (testResult instanceof TestExecuted) {
                return testResult;
              } else if (testResult instanceof TestError) {
                throw new IllegalStateError(testResult.error);
              }
              return undefined;
            })
            .filter(isNonNullable)[0],
          'Unable to derive expected result from test result',
        );
      } else {
        throw new UnsupportedOperationError(
          'Unable to derive expected result from test result',
        );
      }
      // if test is passing, update UI and return
      // if test errors report error
      if (isTestPassing(testExecuted)) {
        this.testState.handleTestResult(testExecuted);
        return;
      } else if (testExecuted instanceof TestError) {
        throw new IllegalStateError(testExecuted.error);
      }
      const assertionStatus = testExecuted.assertStatuses.find(
        (aStatus) =>
          aStatus.assertion.id === this.assertion.id &&
          aStatus instanceof AssertFail,
      );
      const assertFail = guaranteeType(
        assertionStatus,
        AssertFail,
        'Unable to derive expected result from test result',
      );
      const generated = this.assertionState.generateExpected(assertFail);

      if (generated) {
        this.setSelectedTab(TEST_ASSERTION_TAB.EXPECTED);
      }
      this.editorStore.applicationStore.notificationService.notifySuccess(
        `Expected results generated!`,
      );
    } catch (error) {
      assertErrorThrown(error);
      this.editorStore.applicationStore.notificationService.notifyError(
        `Error generating expected result, please check data input: ${error.message}.`,
      );
      this.setSelectedTab(TEST_ASSERTION_TAB.EXPECTED);
      this.generatingExpectedAction.fail();
    } finally {
      this.generatingExpectedAction.complete();
    }
  }

  buildAssertionState(assertion: TestAssertion): TestAssertionState {
    if (assertion instanceof EqualToJson) {
      return new EqualToJsonAssertionState(this.editorStore, this);
    } else if (assertion instanceof EqualTo) {
      const val = returnUndefOnError(() =>
        this.editorStore.graphManagerState.graphManager.buildValueSpecification(
          assertion.expected as PlainObject<ValueSpecification>,
          this.editorStore.graphManagerState.graph,
        ),
      );
      if (val) {
        return new EqualToAssertionState(this.editorStore, this, val);
      }
    }
    return new UnsupportedAssertionState(this.editorStore, this);
  }
}