package csconfig

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

	"github.com/pkg/errors"
	log "github.com/sirupsen/logrus"

	"github.com/crowdsecurity/crowdsec/pkg/types"
)

// CrowdsecServiceCfg contains the location of parsers/scenarios/... and acquisition files
type CrowdsecServiceCfg struct {
	Enable              *bool  `yaml:"enable"`
	AcquisitionFilePath string `yaml:"acquisition_path,omitempty"`
	AcquisitionDirPath  string `yaml:"acquisition_dir,omitempty"`

	AcquisitionFiles     []string          `yaml:"-"`
	ParserRoutinesCount  int               `yaml:"parser_routines"`
	BucketsRoutinesCount int               `yaml:"buckets_routines"`
	OutputRoutinesCount  int               `yaml:"output_routines"`
	SimulationConfig     *SimulationConfig `yaml:"-"`
	LintOnly             bool              `yaml:"-"`                          // if set to true, exit after loading configs
	BucketStateFile      string            `yaml:"state_input_file,omitempty"` // if we need to unserialize buckets at start
	BucketStateDumpDir   string            `yaml:"state_output_dir,omitempty"` // if we need to unserialize buckets on shutdown
	BucketsGCEnabled     bool              `yaml:"-"`                          // we need to garbage collect buckets when in forensic mode

	HubDir             string `yaml:"-"`
	DataDir            string `yaml:"-"`
	ConfigDir          string `yaml:"-"`
	HubIndexFile       string `yaml:"-"`
	SimulationFilePath string `yaml:"-"`
}

func (c *Config) LoadCrowdsec() error {
	var err error

	// Configuration paths are dependency to load crowdsec configuration
	if err = c.LoadConfigurationPaths(); err != nil {
		return err
	}

	if c.Crowdsec == nil {
		log.Warning("crowdsec agent is disabled")
		c.DisableAgent = true
		return nil
	}

	if c.Crowdsec.Enable == nil {
		// if the option is not present, it is enabled by default
		c.Crowdsec.Enable = types.BoolPtr(true)
	}

	if !*c.Crowdsec.Enable {
		log.Warning("crowdsec agent is disabled")
		c.DisableAgent = true
		return nil
	}

	if c.Crowdsec.AcquisitionFiles == nil {
		c.Crowdsec.AcquisitionFiles = []string{}
	}

	if c.Crowdsec.AcquisitionFilePath != "" {
		log.Debugf("non-empty acquisition_path %s", c.Crowdsec.AcquisitionFilePath)
		if _, err = os.Stat(c.Crowdsec.AcquisitionFilePath); err != nil {
			return fmt.Errorf("while checking acquisition_path: %w", err)
		}
		c.Crowdsec.AcquisitionFiles = append(c.Crowdsec.AcquisitionFiles, c.Crowdsec.AcquisitionFilePath)
	}

	if c.Crowdsec.AcquisitionDirPath != "" {
		c.Crowdsec.AcquisitionDirPath, err = filepath.Abs(c.Crowdsec.AcquisitionDirPath)
		if err != nil {
			return errors.Wrapf(err, "can't get absolute path of '%s'", c.Crowdsec.AcquisitionDirPath)
		}

		var files []string

		files, err = filepath.Glob(c.Crowdsec.AcquisitionDirPath + "/*.yaml")
		if err != nil {
			return errors.Wrap(err, "while globbing acquis_dir")
		}
		c.Crowdsec.AcquisitionFiles = append(c.Crowdsec.AcquisitionFiles, files...)

		files, err = filepath.Glob(c.Crowdsec.AcquisitionDirPath + "/*.yml")
		if err != nil {
			return errors.Wrap(err, "while globbing acquis_dir")
		}
		c.Crowdsec.AcquisitionFiles = append(c.Crowdsec.AcquisitionFiles, files...)
	}

	if c.Crowdsec.AcquisitionDirPath == "" && c.Crowdsec.AcquisitionFilePath == "" {
		log.Warning("no acquisition_path or acquisition_dir specified")
	}

	if len(c.Crowdsec.AcquisitionFiles) == 0 {
		log.Warning("no acquisition file found")
	}

	if err = c.LoadSimulation(); err != nil {
		return errors.Wrap(err, "load error (simulation)")
	}

	c.Crowdsec.ConfigDir = c.ConfigPaths.ConfigDir
	c.Crowdsec.DataDir = c.ConfigPaths.DataDir
	c.Crowdsec.HubDir = c.ConfigPaths.HubDir
	c.Crowdsec.HubIndexFile = c.ConfigPaths.HubIndexFile

	if c.Crowdsec.ParserRoutinesCount <= 0 {
		c.Crowdsec.ParserRoutinesCount = 1
	}

	if c.Crowdsec.BucketsRoutinesCount <= 0 {
		c.Crowdsec.BucketsRoutinesCount = 1
	}

	if c.Crowdsec.OutputRoutinesCount <= 0 {
		c.Crowdsec.OutputRoutinesCount = 1
	}

	var crowdsecCleanup = []*string{
		&c.Crowdsec.AcquisitionFilePath,
	}

	for _, k := range crowdsecCleanup {
		if *k == "" {
			continue
		}
		*k, err = filepath.Abs(*k)
		if err != nil {
			return errors.Wrapf(err, "failed to get absolute path of '%s'", *k)
		}
	}

	// Convert relative paths to absolute paths
	for i, file := range c.Crowdsec.AcquisitionFiles {
		f, err := filepath.Abs(file)
		if err != nil {
			return errors.Wrapf(err, "failed to get absolute path of '%s'", file)
		}
		c.Crowdsec.AcquisitionFiles[i] = f
	}

	if err := c.LoadAPIClient(); err != nil {
		return fmt.Errorf("loading api client: %s", err)
	}

	if err := c.LoadHub(); err != nil {
		return errors.Wrap(err, "while loading hub")
	}

	return nil
}
