import type { WebApiTeam } from 'azure-devops-node-api/interfaces/CoreInterfaces.js';
import type {
  GitCommit,
  GitRef,
} from 'azure-devops-node-api/interfaces/GitInterfaces.js';
import { GitPullRequestMergeStrategy } from 'azure-devops-node-api/interfaces/GitInterfaces.js';
import type {
  PolicyConfiguration,
  PolicyEvaluationRecord,
} from 'azure-devops-node-api/interfaces/PolicyInterfaces.js';
import { logger } from '../../../logger/index.ts';
import { streamToString } from '../../../util/streams.ts';
import { getNewBranchName } from '../util.ts';
import * as azureApi from './azure-got-wrapper.ts';
import { WrappedException } from './schema.ts';
import type { AzureBranchObj } from './types.ts';
import {
  getBranchNameWithoutRefsPrefix,
  getBranchNameWithoutRefsheadsPrefix,
} from './util.ts';

const mergePolicyGuid = 'fa4e907d-c16b-4a4c-9dfa-4916e5d171ab'; // Magic GUID for merge strategy policy configurations

export async function getRefs(
  repoId: string,
  branchName?: string,
): Promise<GitRef[]> {
  logger.debug(`getRefs(${repoId}, ${branchName!})`);
  const azureApiGit = await azureApi.gitApi();
  const refs = await azureApiGit.getRefs(
    repoId,
    undefined,
    getBranchNameWithoutRefsPrefix(branchName),
  );
  return refs;
}

export async function getAzureBranchObj(
  repoId: string,
  branchName: string,
  from?: string,
): Promise<AzureBranchObj> {
  const fromBranchName = getNewBranchName(from);
  const refs = await getRefs(repoId, fromBranchName);
  if (refs.length === 0) {
    logger.debug(`getAzureBranchObj without a valid from, so initial commit.`);
    // TODO: fix undefined
    return {
      name: getNewBranchName(branchName)!,
      oldObjectId: '0000000000000000000000000000000000000000',
    };
  }
  return {
    // TODO: fix undefined (#22198)
    name: getNewBranchName(branchName)!,
    oldObjectId: refs[0].objectId!,
  };
}

// if no branchName, look globally
export async function getFile(
  repoId: string,
  filePath: string,
  branchName: string,
): Promise<string | null> {
  logger.trace(`getFile(filePath=${filePath}, branchName=${branchName})`);
  const azureApiGit = await azureApi.gitApi();
  const item = await azureApiGit.getItemText(
    repoId,
    filePath,
    undefined,
    undefined,
    0, // because we look for 1 file
    false,
    false,
    true,
    {
      versionType: 0, // branch
      versionOptions: 0,
      version: getBranchNameWithoutRefsheadsPrefix(branchName),
    },
  );

  if (item?.readable) {
    const fileContent = await streamToString(item);
    try {
      const result = WrappedException.safeParse(fileContent);
      if (result.success) {
        if (result.data.typeKey === 'GitItemNotFoundException') {
          logger.warn({ filePath }, 'Unable to find file');
          return null;
        }
        // v8 ignore else -- TODO: add test #40625
        if (result.data.typeKey === 'GitUnresolvableToCommitException') {
          logger.warn({ branchName }, 'Unable to find branch');
          return null;
        }
      }
    } catch /* v8 ignore next -- non-JSON error body falls through to raw file content, parse failure not simulated in specs */ {
      // it 's not a JSON, so I send the content directly with the line under
    }

    return fileContent;
  }

  return null; // no file found
}

export async function getCommitDetails(
  commit: string,
  repoId: string,
): Promise<GitCommit> {
  logger.debug(`getCommitDetails(${commit}, ${repoId})`);
  const azureApiGit = await azureApi.gitApi();
  const results = await azureApiGit.getCommit(commit, repoId);
  return results;
}

interface MergeStrategyPolicyConfiguration {
  allowNoFastForward?: boolean;
  allowSquash?: boolean;
  allowRebase?: boolean;
  allowRebaseMerge?: boolean;
}

const policyKeyByStrategy: Record<
  GitPullRequestMergeStrategy,
  keyof MergeStrategyPolicyConfiguration
> = {
  [GitPullRequestMergeStrategy.NoFastForward]: 'allowNoFastForward',
  [GitPullRequestMergeStrategy.Squash]: 'allowSquash',
  [GitPullRequestMergeStrategy.Rebase]: 'allowRebase',
  [GitPullRequestMergeStrategy.RebaseMerge]: 'allowRebaseMerge',
};

export async function getMergeMethod(
  repoId: string,
  project: string,
  branchRef?: string | null,
  defaultBranch?: string,
): Promise<GitPullRequestMergeStrategy> {
  logger.debug(
    `getMergeMethod(branchRef=${branchRef}, defaultBranch=${defaultBranch})`,
  );
  interface Scope {
    repositoryId: string;
    refName?: string;
    matchKind: 'Prefix' | 'Exact' | 'DefaultBranch';
  }
  function isRelevantScope(scope: Scope): boolean {
    if (
      scope.matchKind === 'DefaultBranch' &&
      // TODO: types (#22198)
      (!branchRef || branchRef === `refs/heads/${defaultBranch!}`)
    ) {
      return true;
    }
    if (scope.repositoryId !== repoId && scope.repositoryId !== null) {
      return false;
    }
    if (!branchRef) {
      return true;
    }
    // TODO #22198
    return scope.matchKind === 'Exact'
      ? scope.refName === branchRef
      : branchRef.startsWith(scope.refName!);
  }

  const policyConfigurations = (
    await (
      await azureApi.policyApi()
    ).getPolicyConfigurations(project, undefined, mergePolicyGuid)
  )
    .filter((p: PolicyConfiguration) => p.settings.scope.some(isRelevantScope))
    .map((p: PolicyConfiguration) => p.settings)[0];

  logger.debug(
    { policyConfigurations },
    // TODO: types (#22198)
    `getMergeMethod(branchRef=${branchRef!}) determining mergeMethod from matched policy`,
  );

  // Note that this will iterate in the order of GitPullRequestMergeStrategy
  for (const [key, policyKey] of Object.entries(policyKeyByStrategy)) {
    if (policyConfigurations?.[policyKey] === true) {
      const method = parseInt(key, 10) satisfies GitPullRequestMergeStrategy;
      logger.debug(
        { policyConfigurations },
        `getMergeMethod(branchRef=${branchRef!})=${GitPullRequestMergeStrategy[method]}`,
      );
      return method;
    }
  }

  logger.debug(
    { policyConfigurations },
    // TODO: types (#22198)
    `getMergeMethod(branchRef=${branchRef!})=${GitPullRequestMergeStrategy[GitPullRequestMergeStrategy.NoFastForward]}`,
  );
  return GitPullRequestMergeStrategy.NoFastForward;
}

export async function getPolicyEvaluations(
  project: string,
  artifactId: string,
): Promise<PolicyEvaluationRecord[]> {
  logger.debug(`getPolicyEvaluations(${project}, ${artifactId})`);
  const policyEvaluations = await (
    await azureApi.policyApi()
  ).getPolicyEvaluations(project, artifactId);
  return policyEvaluations;
}

export async function getAllProjectTeams(
  projectId: string,
): Promise<WebApiTeam[]> {
  const allTeams: WebApiTeam[] = [];
  const azureApiCore = await azureApi.coreApi();
  const top = 100;
  let skip = 0;
  let length = 0;

  do {
    const teams = await azureApiCore.getTeams(projectId, undefined, top, skip);
    length = teams.length;
    allTeams.push(...teams);
    skip += top;
  } while (top <= length);

  return allTeams;
}