import type { QualityProfile, RailsConfig } from './types.js';

const PROFILE_TO_MAX_WARNINGS: Record<QualityProfile, number> = {
  strict: 0,
  standard: 10,
  minimal: 50,
};

const PROFILE_TO_LINE_LENGTH: Record<QualityProfile, number> = {
  strict: 100,
  standard: 110,
  minimal: 120,
};

export function eslintTemplate(profile: QualityProfile): string {
  return `${JSON.stringify(
    {
      root: true,
      parser: '@typescript-eslint/parser',
      plugins: ['@typescript-eslint'],
      extends: ['eslint:recommended', 'plugin:@typescript-eslint/recommended'],
      env: {
        node: true,
        es2022: true,
      },
      parserOptions: {
        ecmaVersion: 'latest',
        sourceType: 'module',
      },
      rules: {
        'no-console': profile === 'strict' ? 'error' : 'warn',
        '@typescript-eslint/no-explicit-any':
          profile === 'minimal' ? 'off' : profile === 'strict' ? 'error' : 'warn',
        '@typescript-eslint/explicit-function-return-type': profile === 'strict' ? 'warn' : 'off',
        'max-lines-per-function': [
          profile === 'minimal' ? 'off' : 'warn',
          {
            max: profile === 'strict' ? 60 : 100,
            skipBlankLines: true,
            skipComments: true,
          },
        ],
      },
    },
    null,
    2,
  )}\n`;
}

export function biomeTemplate(profile: QualityProfile): string {
  return `${JSON.stringify(
    {
      $schema: 'https://biomejs.dev/schemas/1.8.3/schema.json',
      formatter: {
        enabled: true,
        indentStyle: 'space',
        indentWidth: 2,
        lineWidth: PROFILE_TO_LINE_LENGTH[profile],
      },
      linter: {
        enabled: true,
        rules: {
          recommended: true,
          suspicious: {
            noConsole: profile === 'strict' ? 'error' : 'warn',
          },
          complexity: {
            noExcessiveCognitiveComplexity:
              profile === 'strict' ? 'warn' : profile === 'standard' ? 'info' : 'off',
          },
        },
      },
      javascript: {
        formatter: {
          quoteStyle: 'single',
          trailingCommas: 'all',
        },
      },
    },
    null,
    2,
  )}\n`;
}

export function pyprojectSection(profile: QualityProfile): string {
  const lineLength = PROFILE_TO_LINE_LENGTH[profile];
  return [
    '# >>> mosaic-quality-rails >>>',
    '[tool.ruff]',
    `line-length = ${lineLength}`,
    'target-version = "py311"',
    '',
    '[tool.ruff.lint]',
    'select = ["E", "F", "I", "UP", "B"]',
    `ignore = ${profile === 'minimal' ? '[]' : '["E501"]'}`,
    '',
    '[tool.black]',
    `line-length = ${lineLength}`,
    '',
    '# <<< mosaic-quality-rails <<<',
    '',
  ].join('\n');
}

export function rustfmtTemplate(profile: QualityProfile): string {
  const maxWidth = PROFILE_TO_LINE_LENGTH[profile];
  const useSmallHeuristics = profile === 'strict' ? 'Max' : 'Default';

  return [
    `max_width = ${maxWidth}`,
    `use_small_heuristics = "${useSmallHeuristics}"`,
    `imports_granularity = "${profile === 'minimal' ? 'Crate' : 'Module'}"`,
    `group_imports = "${profile === 'strict' ? 'StdExternalCrate' : 'Preserve'}"`,
    '',
  ].join('\n');
}

function resolveHookCommands(config: RailsConfig): string[] {
  const commands: string[] = [];

  if (config.kind === 'node') {
    if (config.linters.some((linter) => linter.toLowerCase() === 'eslint')) {
      commands.push('pnpm lint');
    }
    if (config.linters.some((linter) => linter.toLowerCase() === 'biome')) {
      commands.push('pnpm biome check .');
    }
    if (config.formatters.some((formatter) => formatter.toLowerCase() === 'prettier')) {
      commands.push('pnpm prettier --check .');
    }
    commands.push('pnpm test --if-present');
  }

  if (config.kind === 'python') {
    commands.push('ruff check .');
    commands.push('black --check .');
  }

  if (config.kind === 'rust') {
    commands.push('cargo fmt --check');
    commands.push('cargo clippy --all-targets --all-features -- -D warnings');
  }

  if (commands.length === 0) {
    commands.push('echo "No quality commands configured for this project kind"');
  }

  return commands;
}

export function preCommitHookTemplate(config: RailsConfig): string {
  const commands = resolveHookCommands(config)
    .map((command) => `${command} || exit 1`)
    .join('\n');

  return [
    '#!/usr/bin/env sh',
    'set -eu',
    '',
    'echo "[quality-rails] Running pre-commit checks..."',
    commands,
    'echo "[quality-rails] Checks passed."',
    '',
  ].join('\n');
}

export function prChecklistTemplate(profile: QualityProfile): string {
  return [
    '# Code Review Checklist',
    '',
    `Profile: **${profile}**`,
    '',
    '- [ ] Requirements mapped to tests',
    '- [ ] Error handling covers unhappy paths',
    '- [ ] Lint and typecheck are clean',
    '- [ ] Test suite passes',
    '- [ ] Security-sensitive paths reviewed',
    `- [ ] Warnings count <= ${PROFILE_TO_MAX_WARNINGS[profile]}`,
    '',
  ].join('\n');
}