package cli

import (
	"fmt"
	"log/slog"

	"git.avsdev.uk/Go/job-search/internal/config"
	"git.avsdev.uk/Go/job-search/internal/logging"
	"github.com/spf13/cobra"
)

// Options holds the flags shared by every command. Bind registers them on the
// root command and RunSetup acts on them.
type Options struct {
	configFile string
	debug      bool
	quiet      bool
}

// Bind registers the shared flags as persistent flags on the root command cmd.
func (o *Options) Bind(cmd *cobra.Command) {
	pf := cmd.PersistentFlags()
	pf.StringVarP(&o.configFile, "config", "c", "", "configuration file")
	pf.BoolVarP(&o.debug, "debug", "d", false, "enable debug messages")
	pf.BoolVarP(
		&o.quiet, "quiet", "q", false, "don't report info or warning messages",
	)
}

// RunSetup prepares a command to run and returns its configuration. When
// loadConfig is true it loads the configuration (from the --config file if
// given), with --debug and --quiet overriding its log level, and then, unless
// terminalLog is true, switches logging to the configured log file (staying
// on the terminal, with a warning, if none is configured).
func (o *Options) RunSetup(
	cmd *cobra.Command, loadConfig bool, terminalLog bool,
) (*config.JobSearchConfig, error) {
	// Flags and arguments are valid from here on, so errors are runtime
	// failures: report them without cobra's usage text.
	cmd.SilenceUsage = true

	// Check for debug level or quiet supression via args
	conf := &config.JobSearchConfig{
		Logging: config.JobSearchConfigLogging{},
	}
	if o.debug {
		conf.Logging.Level = "debug"
	} else if o.quiet {
		conf.Logging.Level = "error"
	}

	// Only load config if command requests it (nearly always true)
	if loadConfig {
		// Load config - from specified file if provided
		if err := config.Init(o.configFile, conf); err != nil {
			return nil, err
		}

		// Change logging level based off newly loaded config
		if conf.Logging.LogLevel() <= slog.LevelDebug && !logging.IsDebugEnabled() {
			logging.EnableDebug()
		}

		// Check if the logging should be switched to file
		if !terminalLog {
			if len(conf.Logging.File) == 0 {
				slog.Warn("No log file configured, remaining in console logging mode!")
			} else if err := logging.LogToFile(conf.Logging.File); err != nil {
				return nil, fmt.Errorf("opening log file: %w", err)
			}
		}
	}

	return conf, nil
}

// Finish shuts down any open file logger
func (o *Options) Finish() error {
	if logging.IsFileLogger() {
		return logging.Shutdown()
	}

	return nil
}