/**
 * Schema drift detection — ports `get-shit-done/bin/lib/schema-detect.cjs`.
 * Used by `verify.schema-drift` to match gsd-tools.cjs JSON output.
 */

// ─── ORM patterns ─────────────────────────────────────────────────────────

const SCHEMA_PATTERNS: Array<{ pattern: RegExp; orm: string }> = [
  { pattern: /^src\/collections\/.*\.ts$/, orm: 'payload' },
  { pattern: /^src\/globals\/.*\.ts$/, orm: 'payload' },
  { pattern: /^prisma\/schema\.prisma$/, orm: 'prisma' },
  { pattern: /^prisma\/schema\/.*\.prisma$/, orm: 'prisma' },
  { pattern: /^drizzle\/schema\.ts$/, orm: 'drizzle' },
  { pattern: /^src\/db\/schema\.ts$/, orm: 'drizzle' },
  { pattern: /^drizzle\/.*\.ts$/, orm: 'drizzle' },
  { pattern: /^supabase\/migrations\/.*\.sql$/, orm: 'supabase' },
  { pattern: /^src\/entities\/.*\.ts$/, orm: 'typeorm' },
  { pattern: /^src\/migrations\/.*\.ts$/, orm: 'typeorm' },
];

const ORM_INFO: Record<
  string,
  {
    pushCommand: string;
    envHint: string | null;
    interactiveWarning: string | null;
    evidencePatterns: RegExp[];
  }
> = {
  payload: {
    pushCommand: 'npx payload migrate',
    envHint: 'CI=true PAYLOAD_MIGRATING=true npx payload migrate',
    interactiveWarning:
      'Payload migrate may require interactive prompts — use CI=true PAYLOAD_MIGRATING=true to suppress',
    evidencePatterns: [/payload\s+migrate/i, /PAYLOAD_MIGRATING/],
  },
  prisma: {
    pushCommand: 'npx prisma db push',
    envHint: 'npx prisma db push --accept-data-loss (if destructive changes are intended)',
    interactiveWarning:
      'Prisma db push may prompt for confirmation on destructive changes — use --accept-data-loss to bypass',
    evidencePatterns: [/prisma\s+db\s+push/i, /prisma\s+migrate\s+deploy/i, /prisma\s+migrate\s+dev/i],
  },
  drizzle: {
    pushCommand: 'npx drizzle-kit push',
    envHint: 'npx drizzle-kit push',
    interactiveWarning: null,
    evidencePatterns: [/drizzle-kit\s+push/i, /drizzle-kit\s+migrate/i],
  },
  supabase: {
    pushCommand: 'supabase db push',
    envHint: 'supabase db push',
    interactiveWarning:
      'Supabase db push may require authentication — ensure SUPABASE_ACCESS_TOKEN is set',
    evidencePatterns: [/supabase\s+db\s+push/i, /supabase\s+migration\s+up/i],
  },
  typeorm: {
    pushCommand: 'npx typeorm migration:run',
    envHint: 'npx typeorm migration:run -d src/data-source.ts',
    interactiveWarning: null,
    evidencePatterns: [/typeorm\s+migration:run/i, /typeorm\s+schema:sync/i],
  },
};

// ─── Public API ───────────────────────────────────────────────────────────

export function detectSchemaFiles(files: string[]): {
  detected: boolean;
  matches: string[];
  orms: string[];
} {
  const matches: string[] = [];
  const orms = new Set<string>();

  for (const rawFile of files) {
    const file = rawFile.replace(/\\/g, '/');
    for (const { pattern, orm } of SCHEMA_PATTERNS) {
      if (pattern.test(file)) {
        matches.push(rawFile);
        orms.add(orm);
        break;
      }
    }
  }

  return {
    detected: matches.length > 0,
    matches,
    orms: [...orms],
  };
}

export function checkSchemaDrift(
  changedFiles: string[],
  executionLog: string,
  options: { skipCheck?: boolean } = {},
): {
  driftDetected: boolean;
  blocking: boolean;
  schemaFiles: string[];
  orms: string[];
  unpushedOrms: string[];
  message: string;
  skipped?: boolean;
} {
  const { skipCheck = false } = options;

  const detection = detectSchemaFiles(changedFiles);

  if (!detection.detected) {
    return {
      driftDetected: false,
      blocking: false,
      schemaFiles: [],
      orms: [],
      unpushedOrms: [],
      message: '',
    };
  }

  const pushedOrms = new Set<string>();
  const unpushedOrms: string[] = [];

  for (const orm of detection.orms) {
    const info = ORM_INFO[orm];
    if (!info) continue;

    const hasPushEvidence = info.evidencePatterns.some(p => p.test(executionLog));
    if (hasPushEvidence) {
      pushedOrms.add(orm);
    } else {
      unpushedOrms.push(orm);
    }
  }

  const driftDetected = unpushedOrms.length > 0;

  if (!driftDetected) {
    return {
      driftDetected: false,
      blocking: false,
      schemaFiles: detection.matches,
      orms: detection.orms,
      unpushedOrms: [],
      message: '',
    };
  }

  const pushCommands = unpushedOrms
    .map(orm => {
      const info = ORM_INFO[orm];
      return info ? `  ${orm}: ${info.envHint || info.pushCommand}` : null;
    })
    .filter(Boolean)
    .join('\n');

  const message = [
    'Schema drift detected: schema-relevant files changed but no database push was executed.',
    '',
    `Schema files changed: ${detection.matches.join(', ')}`,
    `ORMs requiring push: ${unpushedOrms.join(', ')}`,
    '',
    'Required push commands:',
    pushCommands,
    '',
    'Run the appropriate push command, or set GSD_SKIP_SCHEMA_CHECK=true to bypass this gate.',
  ].join('\n');

  if (skipCheck) {
    return {
      driftDetected: true,
      blocking: false,
      skipped: true,
      schemaFiles: detection.matches,
      orms: detection.orms,
      unpushedOrms,
      message: 'Schema drift detected but check was skipped (GSD_SKIP_SCHEMA_CHECK=true).',
    };
  }

  return {
    driftDetected: true,
    blocking: true,
    schemaFiles: detection.matches,
    orms: detection.orms,
    unpushedOrms,
    message,
  };
}