// Copyright 2023 Woodpecker Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package lint

import (
	"fmt"
	"os"
	"path/filepath"
	"strings"

	"github.com/urfave/cli/v2"

	"github.com/woodpecker-ci/woodpecker/cli/common"
	"github.com/woodpecker-ci/woodpecker/pipeline/schema"
)

// Command exports the info command.
var Command = &cli.Command{
	Name:      "lint",
	Usage:     "lint a pipeline configuration file",
	ArgsUsage: "[path/to/.woodpecker.yaml]",
	Action:    lint,
	Flags:     common.GlobalFlags,
}

func lint(c *cli.Context) error {
	return common.RunPipelineFunc(c, lintFile, lintDir)
}

func lintDir(c *cli.Context, dir string) error {
	var errorStrings []string
	if err := filepath.Walk(dir, func(path string, info os.FileInfo, e error) error {
		if e != nil {
			return e
		}

		// check if it is a regular file (not dir)
		if info.Mode().IsRegular() && (strings.HasSuffix(info.Name(), ".yaml") || strings.HasSuffix(info.Name(), ".yml")) {
			fmt.Println("#", info.Name())
			if err := lintFile(c, path); err != nil {
				errorStrings = append(errorStrings, err.Error())
			}
			fmt.Println("")
			return nil
		}

		return nil
	}); err != nil {
		return err
	}

	if len(errorStrings) != 0 {
		return fmt.Errorf("ERRORS: %s", strings.Join(errorStrings, "; "))
	}
	return nil
}

func lintFile(_ *cli.Context, file string) error {
	fi, err := os.Open(file)
	if err != nil {
		return err
	}
	defer fi.Close()

	configErrors, err := schema.Lint(fi)
	if err != nil {
		fmt.Println("❌ Config is invalid")
		for _, configError := range configErrors {
			fmt.Println("In", configError.Field()+":", configError.Description())
		}
		return err
	}

	fmt.Println("✅ Config is valid")
	return nil
}