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

	"github.com/urfave/cli/v3"

	"go.woodpecker-ci.org/woodpecker/v2/cli/common"
	"go.woodpecker-ci.org/woodpecker/v2/pipeline/frontend/yaml"
	"go.woodpecker-ci.org/woodpecker/v2/pipeline/frontend/yaml/linter"
)

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

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

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

	buf, err := os.ReadFile(file)
	if err != nil {
		return err
	}

	rawConfig := string(buf)

	c, err := yaml.ParseString(rawConfig)
	if err != nil {
		return err
	}

	config := &linter.WorkflowConfig{
		File:      path.Base(file),
		RawConfig: rawConfig,
		Workflow:  c,
	}

	// TODO: lint multiple files at once to allow checks for sth like "depends_on" to work
	err = linter.New(linter.WithTrusted(true)).Lint([]*linter.WorkflowConfig{config})
	if err != nil {
		str, err := FormatLintError(config.File, err)

		if str != "" {
			fmt.Print(str)
		}

		return err
	}

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