import fs from 'fs-extra';
import { glob } from 'glob';
import { getOptions } from '../../lib/config/options/index.ts';
import type { UpdateType } from '../../lib/config/types.ts';
import { regEx } from '../../lib/util/regex.ts';
import { templateHelperNames } from '../../lib/util/template/index.ts';
import { isMinimumReleaseAgeApplicable } from '../../lib/workers/repository/process/lookup/filter-checks.ts';

const options = getOptions();
const markdownGlob = '{docs,lib}/**/*.md';

describe('docs/documentation', () => {
  it('has no invalid links', async () => {
    const markdownFiles = await glob(markdownGlob);

    await Promise.all(
      markdownFiles.map(async (markdownFile) => {
        const markdownText = await fs.readFile(markdownFile, 'utf8');
        expect(markdownText).not.toMatch(regEx(/\.md\/#/));
      }),
    );
  });

  describe('website-documentation', () => {
    async function getConfigOptionSubHeaders(
      file: string,
      configOption: string,
    ): Promise<string[]> {
      const subHeadings = [];
      const content = await fs.readFile(`docs/usage/${file}`, 'utf8');
      const reg = regEx(`##\\s\`?${configOption}\`?[\\s\\S]+?\n##\\s`);
      const match = reg.exec(content);
      const subHeadersMatch = match?.[0]?.matchAll(
        /\n###\s`?(?<child>[\w.]+)`?\n/g,
      );
      if (subHeadersMatch) {
        for (const subHeaderStr of subHeadersMatch) {
          if (subHeaderStr?.groups?.child) {
            subHeadings.push(subHeaderStr.groups.child);
          }
        }
      }
      return subHeadings;
    }

    describe('docs/usage/configuration-options.md', () => {
      async function getConfigHeaders(file: string): Promise<string[]> {
        const content = await fs.readFile(`docs/usage/${file}`, 'utf8');
        const matches = content.match(/\n## (?:.*?)\n/g) ?? [];
        return matches
          .map((match) =>
            match.substring(4, match.length - 1).replace(/^`|`$/g, ''),
          )
          .filter((header) => header !== 'managerFilePatterns')
          .filter(
            (header) => header !== 'Locations for configuration filenames',
          );
      }

      function getRequiredConfigOptions(): string[] {
        return (
          options
            .filter((option) => !option.globalOnly)
            // Only include top-level options, which have no parents (implicit root) or explicitly define the
            // root ('.') as their parent.
            .filter(
              (option) =>
                !option.parents ||
                option.parents.length === 0 ||
                option.parents.includes('.'),
            )
            .filter((option) => !option.autogenerated)
            .map((option) => option.name)
            .sort()
        );
      }

      it('has doc headers sorted alphabetically', async () => {
        await expect(
          getConfigHeaders('configuration-options.md'),
        ).resolves.toEqual(
          (await getConfigHeaders('configuration-options.md')).sort(),
        );
      });

      it('has headers for every required option', async () => {
        await expect(
          getConfigHeaders('configuration-options.md'),
        ).resolves.toEqual(getRequiredConfigOptions());
      });

      function getPostUpdateOptionsValues(): Set<string> {
        const option = options.find((o) => o.name === 'postUpdateOptions');
        return new Set(option?.allowedValues ?? []);
      }

      async function getConfigSubHeaders(file: string): Promise<string[]> {
        const postUpdateValues = getPostUpdateOptionsValues();
        const content = await fs.readFile(`docs/usage/${file}`, 'utf8');
        const matches = content.match(/\n### (?:.*?)\n/g) ?? [];
        return matches
          .map((match) =>
            match.substring(5, match.length - 1).replace(/^`|`$/g, ''),
          )
          .filter((header) => !postUpdateValues.has(header))
          .sort();
      }

      function getRequiredConfigSubOptions(): string[] {
        return (
          options
            .filter((option) => option.stage !== 'global')
            .filter((option) => !option.globalOnly)
            // Only include true sub-options: options which have parents but none of those are explicitly the root ('.').
            .filter(
              (option) =>
                option.parents &&
                option.parents.length > 0 &&
                !option.parents.includes('.'),
            )
            .filter((option) => option.name !== 'managerFilePatterns')
            .flatMap((option) =>
              (option.parents ?? [])
                .filter((parent) => parent !== '.')
                .map((parent) => `${parent}.${option.name}`),
            )
            .sort()
        );
      }

      function getParentNames(): Set<string> {
        const childrens = options
          .filter((option) => option.stage !== 'global')
          .filter((option) => !option.globalOnly)
          .filter((option) => option.parents);

        const parentNames = new Set<string>();
        for (const children of childrens) {
          const parents = children.parents ?? [];
          for (const parent of parents) {
            parentNames.add(parent);
          }
        }

        return parentNames;
      }

      it('has headers for every required sub-option', async () => {
        await expect(
          getConfigSubHeaders('configuration-options.md'),
        ).resolves.toEqual(getRequiredConfigSubOptions());
      });

      it.each([...getParentNames()])(
        '%s has sub-headers sorted alphabetically',
        async (parentName: string) => {
          await expect(
            getConfigOptionSubHeaders('configuration-options.md', parentName),
          ).resolves.toEqual(
            (
              await getConfigOptionSubHeaders(
                'configuration-options.md',
                parentName,
              )
            ).sort(),
          );
        },
      );

      it('has a sorted header for every postUpdateOptions value', async () => {
        const postUpdateHeaders = await getConfigOptionSubHeaders(
          'configuration-options.md',
          'postUpdateOptions',
        );
        const postUpdateOption = options.find(
          (o) => o.name === 'postUpdateOptions',
        );
        const allowedValues = [
          ...(postUpdateOption?.allowedValues ?? []),
        ].sort();
        expect(postUpdateHeaders).toEqual(allowedValues);
      });
    });

    describe('docs/usage/self-hosted-configuration.md', () => {
      async function getSelfHostedHeaders(file: string): Promise<string[]> {
        const content = await fs.readFile(`docs/usage/${file}`, 'utf8');
        const matches = content.match(/\n## (?:.*?)\n/g) ?? [];
        return matches.map((match) =>
          match.substring(4, match.length - 1).replace(/^`|`$/g, ''),
        );
      }

      // Sub-options (e.g. `hostRules.allowInternal`) are only valid in self-hosted
      // config, so their parent (e.g. `hostRules`) needs its own top-level header
      // here even though the parent option itself isn't `globalOnly`.
      function getSelfHostedParentNames(): Set<string> {
        const childrens = options
          .filter((option) => option.globalOnly)
          .filter(
            (option) =>
              option.parents &&
              option.parents.length > 0 &&
              !option.parents.includes('.'),
          );

        const parentNames = new Set<string>();
        for (const children of childrens) {
          for (const parent of children.parents ?? []) {
            parentNames.add(parent);
          }
        }

        return parentNames;
      }

      function getRequiredSelfHostedOptions(): string[] {
        const topLevelOptions = options
          .filter((option) => option.globalOnly)
          // Only include top-level options, which have no parents (implicit root) or explicitly define the
          // root ('.') as their parent.
          .filter(
            (option) =>
              !option.parents ||
              option.parents.length === 0 ||
              option.parents.includes('.'),
          )
          .map((option) => option.name);

        return [
          ...new Set([...topLevelOptions, ...getSelfHostedParentNames()]),
        ].sort();
      }

      async function getSelfHostedSubHeaders(file: string): Promise<string[]> {
        const content = await fs.readFile(`docs/usage/${file}`, 'utf8');
        const matches = content.matchAll(/\n###\s`?(?<child>[\w.]+)`?\n/g);
        return [...matches]
          .map((match) => match.groups?.child)
          .filter((child): child is string => !!child)
          .sort();
      }

      function getRequiredSelfHostedSubOptions(): string[] {
        return (
          options
            .filter((option) => option.globalOnly)
            // Only include true sub-options: options which have parents but none of those are explicitly the root ('.').
            .filter(
              (option) =>
                option.parents &&
                option.parents.length > 0 &&
                !option.parents.includes('.'),
            )
            .flatMap((option) =>
              (option.parents ?? [])
                .filter((parent) => parent !== '.')
                .map((parent) => `${parent}.${option.name}`),
            )
            .sort()
        );
      }

      it('has headers sorted alphabetically', async () => {
        await expect(
          getSelfHostedHeaders('self-hosted-configuration.md'),
        ).resolves.toEqual(
          (await getSelfHostedHeaders('self-hosted-configuration.md')).sort(),
        );
      });

      it('has headers for every required option', async () => {
        await expect(
          getSelfHostedHeaders('self-hosted-configuration.md'),
        ).resolves.toEqual(getRequiredSelfHostedOptions());
      });

      it('has headers for every required sub-option', async () => {
        await expect(
          getSelfHostedSubHeaders('self-hosted-configuration.md'),
        ).resolves.toEqual(getRequiredSelfHostedSubOptions());
      });

      it.each([...getSelfHostedParentNames()])(
        '%s has sub-headers sorted alphabetically',
        async (parentName: string) => {
          await expect(
            getConfigOptionSubHeaders(
              'self-hosted-configuration.md',
              parentName,
            ),
          ).resolves.toEqual(
            (
              await getConfigOptionSubHeaders(
                'self-hosted-configuration.md',
                parentName,
              )
            ).sort(),
          );
        },
      );
    });

    describe('docs/usage/self-hosted-experimental.md', () => {
      async function getSelfHostedExperimentalConfigHeaders(
        file: string,
      ): Promise<string[]> {
        const content = await fs.readFile(`docs/usage/${file}`, 'utf8');
        const matches = content.match(/\n## (?:.*?)\n/g) ?? [];
        return matches.map((match) => match.substring(4, match.length - 1));
      }

      it('has headers sorted alphabetically', async () => {
        await expect(
          getSelfHostedExperimentalConfigHeaders('self-hosted-experimental.md'),
        ).resolves.toEqual(
          (
            await getSelfHostedExperimentalConfigHeaders(
              'self-hosted-experimental.md',
            )
          ).sort(),
        );
      });
    });

    describe('docs/usage/templates.md', async () => {
      async function getAdditionalHandlebarsHelpersHeaders(): Promise<
        string[]
      > {
        const content = await fs.readFile(`docs/usage/templates.md`, 'utf8');
        const matches = content.match(/\n### (?:.*?)\n/g) ?? [];
        return matches.map((match) => match.substring(5, match.length - 1));
      }

      const additionalHandlebarsHelpers =
        await getAdditionalHandlebarsHelpersHeaders();

      it('has headers sorted alphabetically', () => {
        expect(additionalHandlebarsHelpers).toEqual(
          additionalHandlebarsHelpers.toSorted(),
        );
      });

      it('documents all added Handlebars helpers', () => {
        expect(additionalHandlebarsHelpers).toEqual(
          templateHelperNames.toSorted(),
        );
      });
    });

    describe('docs/usage/key-concepts/minimum-release-age.md', () => {
      const supportEmoji: Record<string, boolean> = {
        '✅': true,
        '🟡': true,
        '❌': false,
      };

      async function getUpdateTypeSupportTable(): Promise<
        Record<string, boolean>
      > {
        const content = await fs.readFile(
          'docs/usage/key-concepts/minimum-release-age.md',
          'utf8',
        );
        // RE2 (renovate's regex engine) doesn't support lookahead, so bound
        // the section with plain index lookups instead of `(?=\n### )`.
        const start = regEx(/### Which update types take/).exec(content)?.index;
        let section: string | undefined;
        if (start !== undefined) {
          const end = content.indexOf('\n### ', start + 1);
          section = content.slice(start, end === -1 ? undefined : end);
        }
        const rows =
          section?.matchAll(
            /^\|\s*`(?<updateType>\w+)`\s*\|\s*(?<emoji>[^\s|]+)\s*\|/gm,
          ) ?? [];
        const table: Record<string, boolean> = {};
        for (const row of rows) {
          const { updateType, emoji } = row.groups!;
          table[updateType] = supportEmoji[emoji];
        }
        return table;
      }

      it('matches isMinimumReleaseAgeApplicable() for every documented update type', async () => {
        const table = await getUpdateTypeSupportTable();
        for (const [updateType, docsSupport] of Object.entries(table)) {
          expect(isMinimumReleaseAgeApplicable(updateType as UpdateType)).toBe(
            docsSupport,
          );
        }
      });
    });
  });
});