import * as plugins from './tstest.plugins.js';
import type { DenoOptions, RuntimeOptions } from './tstest.classes.runtime.adapter.js';
import type { Runtime } from './tstest.classes.runtime.parser.js';
import { DENO_DEFAULT_PERMISSIONS } from './tstest.classes.runtime.deno.js';

type DirectiveScope = Runtime | 'global';

export interface ITestFileDirective {
  scope: DirectiveScope;
  key: string;
  value?: string;
}

export interface IParsedDirectives {
  deno: ITestFileDirective[];
  node: ITestFileDirective[];
  bun: ITestFileDirective[];
  chromium: ITestFileDirective[];
  global: ITestFileDirective[];
}

const VALID_SCOPES = new Set<string>(['deno', 'node', 'bun', 'chromium']);

const DENO_PERMISSION_MAP: Record<string, string> = {
  allowAll: '--allow-all',
  allowRun: '--allow-run',
  allowFfi: '--allow-ffi',
  allowHrtime: '--allow-hrtime',
  allowRead: '--allow-read',
  allowWrite: '--allow-write',
  allowNet: '--allow-net',
  allowEnv: '--allow-env',
  allowSys: '--allow-sys',
};

function createEmptyDirectives(): IParsedDirectives {
  return { deno: [], node: [], bun: [], chromium: [], global: [] };
}

/**
 * Parse tstest directives from file content.
 * Scans comments at the top of the file (before any code).
 */
export function parseDirectivesFromContent(content: string): IParsedDirectives {
  const result = createEmptyDirectives();
  const lines = content.split('\n');
  const maxLines = Math.min(lines.length, 30);

  for (let i = 0; i < maxLines; i++) {
    const line = lines[i].trim();

    // Skip empty lines
    if (line === '') continue;

    // Stop at first non-comment line
    if (!line.startsWith('//')) break;

    // Match tstest directive: // tstest:<rest>
    const match = line.match(/^\/\/\s*tstest:(.+)$/);
    if (!match) continue;

    const parts = match[1].split(':');
    if (parts.length < 2) {
      console.warn(`Warning: malformed tstest directive: "${line}"`);
      continue;
    }

    const scopeStr = parts[0].trim();
    const key = parts[1].trim();
    const value = parts.length > 2 ? parts.slice(2).join(':').trim() : undefined;

    // Handle global directives (env, timeout)
    if (scopeStr === 'env' || scopeStr === 'timeout') {
      result.global.push({
        scope: 'global',
        key: scopeStr,
        value: key + (value !== undefined ? ':' + value : ''),
      });
      continue;
    }

    if (!VALID_SCOPES.has(scopeStr)) {
      console.warn(`Warning: unknown tstest directive scope "${scopeStr}" in: "${line}"`);
      continue;
    }

    const scope = scopeStr as Runtime;
    result[scope].push({ scope, key, value });
  }

  return result;
}

/**
 * Parse directives from a test file on disk.
 */
export async function parseDirectivesFromFile(filePath: string): Promise<IParsedDirectives> {
  try {
    const content = plugins.fs.readFileSync(filePath, 'utf8');
    return parseDirectivesFromContent(content);
  } catch {
    return createEmptyDirectives();
  }
}

/**
 * Merge directives from 00init.ts and the test file.
 * Test file directives are appended (take effect after init directives).
 */
export function mergeDirectives(init: IParsedDirectives, testFile: IParsedDirectives): IParsedDirectives {
  return {
    deno: [...init.deno, ...testFile.deno],
    node: [...init.node, ...testFile.node],
    bun: [...init.bun, ...testFile.bun],
    chromium: [...init.chromium, ...testFile.chromium],
    global: [...init.global, ...testFile.global],
  };
}

/**
 * Check if any directives exist for any scope.
 */
export function hasDirectives(directives: IParsedDirectives): boolean {
  return (
    directives.deno.length > 0 ||
    directives.node.length > 0 ||
    directives.bun.length > 0 ||
    directives.chromium.length > 0 ||
    directives.global.length > 0
  );
}

/**
 * Convert parsed directives into DenoOptions.
 */
function directivesToDenoOptions(directives: IParsedDirectives): DenoOptions | undefined {
  const denoDirectives = directives.deno;
  if (denoDirectives.length === 0 && directives.global.length === 0) return undefined;

  const options: DenoOptions = {};
  const extraPermissions: string[] = [];
  const extraArgs: string[] = [];
  const env: Record<string, string> = {};
  let useAllowAll = false;

  for (const d of denoDirectives) {
    if (d.key === 'allowAll') {
      useAllowAll = true;
    } else if (DENO_PERMISSION_MAP[d.key]) {
      extraPermissions.push(DENO_PERMISSION_MAP[d.key]);
    } else if (d.key === 'flag' && d.value) {
      extraArgs.push(d.value);
    }
  }

  // Process global directives
  for (const d of directives.global) {
    if (d.key === 'env' && d.value) {
      const eqIndex = d.value.indexOf('=');
      if (eqIndex > 0) {
        env[d.value.substring(0, eqIndex)] = d.value.substring(eqIndex + 1);
      }
    }
  }

  if (useAllowAll) {
    // --allow-all replaces individual permissions, but keep compatibility flags
    options.permissions = ['--allow-all', '--node-modules-dir', '--sloppy-imports'];
  } else if (extraPermissions.length > 0) {
    // Start with defaults and add extra permissions (deduplicated)
    const allPermissions = [...DENO_DEFAULT_PERMISSIONS];
    for (const p of extraPermissions) {
      if (!allPermissions.includes(p)) {
        allPermissions.push(p);
      }
    }
    options.permissions = allPermissions;
  }

  if (extraArgs.length > 0) options.extraArgs = extraArgs;
  if (Object.keys(env).length > 0) options.env = env;

  // Return undefined if nothing was set
  if (!options.permissions && !options.extraArgs && !options.env) return undefined;
  return options;
}

/**
 * Convert parsed directives into RuntimeOptions for Node/Bun (flag directives only).
 */
function directivesToGenericOptions(directives: ITestFileDirective[], globalDirectives: ITestFileDirective[]): RuntimeOptions | undefined {
  const extraArgs: string[] = [];
  const env: Record<string, string> = {};

  for (const d of directives) {
    if (d.key === 'flag' && d.value) {
      extraArgs.push(d.value);
    }
  }

  for (const d of globalDirectives) {
    if (d.key === 'env' && d.value) {
      const eqIndex = d.value.indexOf('=');
      if (eqIndex > 0) {
        env[d.value.substring(0, eqIndex)] = d.value.substring(eqIndex + 1);
      }
    }
  }

  if (extraArgs.length === 0 && Object.keys(env).length === 0) return undefined;

  const options: RuntimeOptions = {};
  if (extraArgs.length > 0) options.extraArgs = extraArgs;
  if (Object.keys(env).length > 0) options.env = env;
  return options;
}

/**
 * Convert parsed directives into RuntimeOptions for a specific runtime.
 */
export function directivesToRuntimeOptions(directives: IParsedDirectives, runtime: Runtime): RuntimeOptions | undefined {
  if (runtime === 'deno') {
    return directivesToDenoOptions(directives);
  }
  return directivesToGenericOptions(directives[runtime] || [], directives.global);
}