const fs = require('fs-extra');
const path = require('path');
const execa = require('execa');
const inquirer = require('inquirer');
const Listr = require('listr');
const semver = require('semver');
const { bold, cyan, dim } = require('colorette');

const rootDir = path.join(__dirname, '../');

const packages = [
  'core',
  'docs',
  'angular',
  'packages/react',
  'packages/react-router',
  'packages/angular-server'
];

function readPkg(project) {
  const packageJsonPath = packagePath(project);
  return JSON.parse(fs.readFileSync(packageJsonPath, 'utf-8'));
}

function writePkg(project, pkg) {
  const packageJsonPath = packagePath(project);
  const text = JSON.stringify(pkg, null, 2);
  return fs.writeFileSync(packageJsonPath, `${text}\n`);
}

function packagePath(project) {
  return path.join(rootDir, project, 'package.json');
}

function projectPath(project) {
  return path.join(rootDir, project);
}

async function askNpmTag(version) {
  const prompts = [
    {
      type: 'list',
      name: 'npmTag',
      message: 'Select npm tag or specify a new tag',
      choices: ['latest', 'next', 'v4-lts']
        .concat([
          new inquirer.Separator(),
          {
            name: 'Other (specify)',
            value: null
          }
        ])
    },
    {
      type: 'confirm',
      name: 'confirm',
      message: answers => {
        return `Will publish ${cyan(version)} to ${cyan(answers.npmTag)}. Continue?`;
      }
    }
  ];

  const { npmTag, confirm } = await inquirer.prompt(prompts);
  return { npmTag, confirm };
}

function checkGit(tasks) {
  tasks.push(
    {
      title: 'Check current branch',
      task: () =>
        execa.stdout('git', ['symbolic-ref', '--short', 'HEAD']).then(branch => {
          if (branch.indexOf('release') === -1 && branch.indexOf('hotfix') === -1) {
            throw new Error(`Must be on a "release" or "hotfix" branch.`);
          }
        })
    },
    {
      title: 'Check local working tree',
      task: () =>
        execa.stdout('git', ['status', '--porcelain']).then(status => {
          if (status !== '') {
            throw new Error(`Unclean working tree. Commit or stash changes first.`);
          }
        })
    },
    {
      title: 'Check remote history',
      task: () =>
        execa.stdout('git', ['rev-list', '--count', '--left-only', '@{u}...HEAD']).then(result => {
          if (result !== '0') {
            throw new Error(`Remote history differs. Please pull changes.`);
          }
        })
    }
  );
}

function checkTestDist(tasks) {
  tasks.push({
    title: 'Check dist folders for required files',
    task: () =>
      execa.stdout('node', ['.scripts/test-dist.js']).then(status => {
        if (status.indexOf('✅ test.dist') === -1) {
          throw new Error(`Test Dist did not find some required files`);
        }
      })
  });
}

const isValidVersion = input => Boolean(semver.valid(input));

function preparePackage(tasks, package, version, install) {
  const projectRoot = projectPath(package);
  const pkg = readPkg(package);

  const projectTasks = [];
  if (version) {
    projectTasks.push({
      title: `${pkg.name}: validate new version`,
      task: () => {
        if (!isVersionGreater(pkg.version, version)) {
          throw new Error(
            `New version \`${version}\` should be higher than current version \`${pkg.version}\``
          );
        }
      }
    });
    if (install) {
      projectTasks.push({
        title: `${pkg.name}: install npm dependencies`,
        task: async () => {
          await fs.remove(path.join(projectRoot, 'node_modules'));
          await execa('npm', ['i'], { cwd: projectRoot });
        }
      });
    }
  }

  if (package !== 'docs') {
    if (package !== 'core') {
      projectTasks.push({
        title: `${pkg.name}: npm link @ionic/core`,
        task: () => execa('npm', ['link', '@ionic/core'], { cwd: projectRoot })
      });

      if (package === 'packages/react-router') {
        projectTasks.push({
          title: `${pkg.name}: npm link @ionic/react`,
          task: () => execa('npm', ['link', '@ionic/react'], { cwd: projectRoot })
        });
      }
    }

    // Lint, Test, Bump Core dependency
    if (version) {
      projectTasks.push({
        title: `${pkg.name}: lint`,
        task: () => execa('npm', ['run', 'lint'], { cwd: projectRoot })
      });
      // TODO will not work due to https://github.com/ionic-team/ionic/issues/20136
      // projectTasks.push({
      //   title: `${pkg.name}: test`,
      //   task: async () => await execa('npm', ['test'], { cwd: projectRoot })
      // });
    }

    // Build
    projectTasks.push({
      title: `${pkg.name}: build`,
      task: () => execa('npm', ['run', 'build'], { cwd: projectRoot })
    });

    // Link core or react for sub projects
    if (package === 'core' || package === 'packages/react') {
      projectTasks.push({
        title: `${pkg.name}: npm link`,
        task: () => execa('npm', ['link'], { cwd: projectRoot })
      });
    }

    if (version) {
      projectTasks.push({
        title: `${pkg.name}: update ionic/core dep to ${version}`,
        task: () => {
          updateDependency(pkg, '@ionic/core', version);
          writePkg(package, pkg);
        }
      });
    }
  }

  // Add project tasks
  tasks.push({
    title: `Prepare ${bold(pkg.name)}`,
    task: () => new Listr(projectTasks)
  });
}

function prepareDevPackage(tasks, package, version) {
  const projectRoot = projectPath(package);
  const pkg = readPkg(package);

  const projectTasks = [];

  if (package !== 'docs') {
    if (package !== 'core') {
      projectTasks.push({
        title: `${pkg.name}: npm link @ionic/core`,
        task: () => execa('npm', ['link', '@ionic/core'], { cwd: projectRoot })
      });
    }

    projectTasks.push({
      title: `${pkg.name}: update ionic/core dep to ${version}`,
      task: () => {
        updateDependency(pkg, '@ionic/core', version);
        writePkg(package, pkg);
      }
    });

    projectTasks.push({
      title: `${pkg.name}: build`,
      task: () => execa('npm', ['run', 'build'], { cwd: projectRoot })
    });

    if (package === 'core' || package === 'packages/react') {
      projectTasks.push({
        title: `${pkg.name}: npm link`,
        task: () => execa('npm', ['link'], { cwd: projectRoot })
      });
    }
  }

  // Add project tasks
  tasks.push({
    title: `Prepare dev build: ${bold(pkg.name)}`,
    task: () => new Listr(projectTasks)
  });
}

function updatePackageVersions(tasks, packages, version) {
  packages.forEach(package => {
    updatePackageVersion(tasks, package, version);

    tasks.push({
      title: `${package} update @ionic/core dependency, if present ${dim(`(${version})`)}`,
      task: async () => {
        if (package !== 'core') {
          const pkg = readPkg(package);
          updateDependency(pkg, '@ionic/core', version);
          writePkg(package, pkg);
        }
      }
    });

    // angular & angular-server need to update their dist versions
    if (package === 'angular' || package === 'packages/angular-server') {
      const distPackage = path.join(package, 'dist');

      updatePackageVersion(tasks, distPackage, version);

      tasks.push({
        title: `${package} update @ionic/core dependency, if present ${dim(`(${version})`)}`,
        task: async () => {
          const pkg = readPkg(distPackage);
          updateDependency(pkg, '@ionic/core', version);
          writePkg(distPackage, pkg);
        }
      });
    }

    if (package === 'packages/react-router') {
      tasks.push({
        title: `${package} update @ionic/react dependency, if present ${dim(`(${version})`)}`,
        task: async () => {
          const pkg = readPkg(package);
          updateDependency(pkg, '@ionic/react', version);
          writePkg(package, pkg);
        }
      });
    }
  });
}

function updatePackageVersion(tasks, package, version) {
  const projectRoot = projectPath(package);

  tasks.push({
    title: `${package}: update package.json ${dim(`(${version})`)}`,
    task: async () => {
      await execa('npm', ['version', version], { cwd: projectRoot });
    }
  });
}

function copyPackageToDist(tasks, packages) {
  packages.forEach(package => {
    const projectRoot = projectPath(package);

    // angular and angular-server are the only packages that publish dist
    if (package !== 'angular' && package !== 'packages/angular-server') {
      return;
    }

    tasks.push({
      title: `${package}: Copy package.json to dist`,
      task: () => execa('node', ['copy-package.js', package], { cwd: path.join(rootDir, '.scripts') })
    });
  });
}

function publishPackages(tasks, packages, version, npmTag = 'latest') {
  // first verify version
  packages.forEach(package => {
    if (package === 'core') {
      return;
    }

    tasks.push({
      title: `${package}: check version (must match: ${version})`,
      task: () => {
        const pkg = readPkg(package);

        if (version !== pkg.version) {
          throw new Error(`${pkg.name} version ${pkg.version} must match ${version}`);
        }
      }
    });
  });

  // Publish
  packages.forEach(package => {
    let projectRoot = projectPath(package);

    if (package === 'packages/angular-server' || package === 'angular') {
      projectRoot = path.join(projectRoot, 'dist')
    }

    tasks.push({
      title: `${package}: publish to ${npmTag} tag`,
      task: async () => {
        await execa('npm', ['publish', '--tag', npmTag], { cwd: projectRoot });
      }
    });
  });
}

function updateDependency(pkg, dependency, version) {
  if (pkg.dependencies && pkg.dependencies[dependency]) {
    pkg.dependencies[dependency] = version;
  }
  if (pkg.devDependencies && pkg.devDependencies[dependency]) {
    pkg.devDependencies[dependency] = version;
  }
  if (pkg.peerDependencies && pkg.peerDependencies[dependency]) {
    pkg.peerDependencies[dependency] = version;
  }
}

function isVersionGreater(oldVersion, newVersion) {
  if (!isValidVersion(newVersion)) {
    throw new Error('Version should be a valid semver version.');
  }
  return true;
}

function copyCDNLoader(tasks, version) {
  tasks.push({
    title: `Copy CDN loader`,
    task: () => execa('node', ['copy-cdn-loader.js', version], { cwd: path.join(rootDir, 'core', 'scripts') })
  });
}

module.exports = {
  checkTestDist,
  checkGit,
  askNpmTag,
  isValidVersion,
  isVersionGreater,
  copyCDNLoader,
  copyPackageToDist,
  packages,
  packagePath,
  prepareDevPackage,
  preparePackage,
  projectPath,
  publishPackages,
  readPkg,
  rootDir,
  updateDependency,
  updatePackageVersion,
  updatePackageVersions,
  writePkg
};