import { z } from 'zod/v4';
import { logger } from '../../../logger/index.ts';
import {
  DeepNullish,
  LooseArray,
  Nullish,
} from '../../../util/schema-utils/index.ts';

const Ecosystem = z.enum([
  'actions',
  'composer',
  'go',
  'maven',
  'npm',
  'nuget',
  'pip',
  'rubygems',
  'rust',
]);
export type Ecosystem = z.infer<typeof Ecosystem>;

const Package = z.object({
  ecosystem: Ecosystem.catch((ctx) => {
    logger.debug(
      { ecosystem: ctx.input },
      'Skipping vulnerability alert with unsupported ecosystem',
    );
    return undefined as any;
  }),
  name: z.string(),
});

const Severity = z.enum(['low', 'medium', 'high', 'critical']);

const SecurityVulnerability = z
  .object({
    first_patched_version: Nullish(z.object({ identifier: z.string() })),
    package: Package,
    severity: Severity,
    vulnerable_version_range: z.string(),
  })
  .nullable();

const CvssSeverity = z.object({
  vector_string: z.string().nullable(),
  score: z.number().nullable(),
});

const SecurityAdvisory = z.object({
  ghsa_id: z.string(),
  summary: z.string(),
  description: z.string(),
  identifiers: z.array(
    z.object({
      type: z.string(),
      value: z.string(),
    }),
  ),
  references: z.array(z.object({ url: z.string() })).optional(),
  severity: Severity,
  cvss_severities: Nullish(
    DeepNullish(
      z.object({
        cvss_v3: CvssSeverity.optional(),
        cvss_v4: CvssSeverity.optional(),
      }),
    ),
  ),
});
export type SecurityAdvisory = z.infer<typeof SecurityAdvisory>;

export const GithubVulnerabilityAlerts = LooseArray(
  z.object({
    dismissed_reason: Nullish(z.string()),
    security_advisory: SecurityAdvisory,
    security_vulnerability: SecurityVulnerability,
    dependency: z.object({
      manifest_path: z.string(),
    }),
  }),
  {
    onError: ({ error }) => {
      logger.debug(
        { err: error },
        'Vulnerability Alert: Failed to parse some alerts',
      );
    },
  },
).transform((alerts) =>
  alerts.filter((alert) => alert.security_vulnerability?.package?.ecosystem),
);
export type GithubVulnerabilityAlerts = z.infer<
  typeof GithubVulnerabilityAlerts
>;
export type GithubVulnerabilityAlert = GithubVulnerabilityAlerts[number];

// https://docs.github.com/en/rest/repos/contents?apiVersion=2022-11-28#get-repository-content
const GithubResponseMetadata = z.object({
  name: z.string(),
  path: z.string(),
});

export const GithubFileMeta = GithubResponseMetadata.extend({
  type: z.literal('file'),
});
export type GithubFileMeta = z.infer<typeof GithubFileMeta>;

export const GithubFile = GithubFileMeta.extend({
  content: z.string(),
  encoding: z.string(),
});
export type GithubFile = z.infer<typeof GithubFile>;

export const GithubDirectory = GithubResponseMetadata.extend({
  type: z.literal('dir'),
});

export type GithubDirectory = z.infer<typeof GithubDirectory>;

export const GithubOtherContent = GithubResponseMetadata.extend({
  type: z.literal('symlink').or(z.literal('submodule')),
});

export type GithubOtherContent = z.infer<typeof GithubOtherContent>;

export const GithubElement = GithubFile.or(GithubFileMeta)
  .or(GithubDirectory)
  .or(GithubOtherContent);
export type GithubElement = z.infer<typeof GithubElement>;

export const GithubContentResponse = z.array(GithubElement).or(GithubElement);

export const GithubBranchProtection = z.object({
  required_status_checks: Nullish(
    z.object({
      strict: z.boolean(),
    }),
  ),
});
export type GithubBranchProtection = z.infer<typeof GithubBranchProtection>;

const GithubRulesetRule = z.discriminatedUnion('type', [
  z.object({
    type: z.literal('non_fast_forward'),
  }),
  z.object({
    type: z.literal('required_status_checks'),
    parameters: z.object({
      strict_required_status_checks_policy: z.boolean().optional(),
    }),
  }),
  // prevents deletion
  z.object({
    type: z.literal('deletion'),
  }),
]);

export const GithubBranchRulesets = LooseArray(GithubRulesetRule);
export type GithubBranchRulesets = z.infer<typeof GithubBranchRulesets>;

const GithubIssueBase = z.object({
  number: z.number(),
  state: z.string().transform((val) => val.toLowerCase()),
  title: z.string(),
  body: z.string(),
});

const GithubGraphqlIssue = GithubIssueBase.extend({
  updatedAt: z.string(),
}).transform((issue) => {
  const lastModified = issue.updatedAt;
  const { number, state, title, body } = issue;
  return { number, state, title, body, lastModified };
});

const GithubRestIssue = GithubIssueBase.extend({
  updated_at: z.string(),
}).transform((issue) => {
  const lastModified = issue.updated_at;
  const { number, state, title, body } = issue;
  return { number, state, title, body, lastModified };
});

export const GithubIssue = z.union([GithubGraphqlIssue, GithubRestIssue]);
export type GithubIssue = z.infer<typeof GithubIssue>;