package cli

import (
	"path/filepath"
	"strings"

	"git.eeqj.de/sneak/secret/internal/vault"
	"github.com/spf13/afero"
	"github.com/spf13/cobra"
)

// getSecretNamesCompletionFunc returns a completion function that provides
// secret names
func getSecretNamesCompletionFunc(fs afero.Fs, stateDir string) func(
	cmd *cobra.Command, args []string, toComplete string,
) ([]string, cobra.ShellCompDirective) {
	return func(
		_ *cobra.Command, _ []string, toComplete string,
	) ([]string, cobra.ShellCompDirective) {
		// Get current vault
		vlt, err := vault.GetCurrentVault(fs, stateDir)
		if err != nil {
			return nil, cobra.ShellCompDirectiveNoFileComp
		}

		// Get list of secrets
		secrets, err := vlt.ListSecrets()
		if err != nil {
			return nil, cobra.ShellCompDirectiveNoFileComp
		}

		// Filter secrets based on what user has typed
		var completions []string

		for _, secret := range secrets {
			if strings.HasPrefix(secret, toComplete) {
				completions = append(completions, secret)
			}
		}

		return completions, cobra.ShellCompDirectiveNoFileComp
	}
}

// getUnlockerIDsCompletionFunc returns a completion function that provides
// unlocker IDs
func getUnlockerIDsCompletionFunc(fs afero.Fs, stateDir string) func(
	cmd *cobra.Command, args []string, toComplete string,
) ([]string, cobra.ShellCompDirective) {
	return func(
		_ *cobra.Command, _ []string, toComplete string,
	) ([]string, cobra.ShellCompDirective) {
		// Get current vault
		vlt, err := vault.GetCurrentVault(fs, stateDir)
		if err != nil {
			return nil, cobra.ShellCompDirectiveNoFileComp
		}

		// Get unlocker metadata list
		unlockerMetadataList, err := vlt.ListUnlockers()
		if err != nil {
			return nil, cobra.ShellCompDirectiveNoFileComp
		}

		// Get vault directory
		vaultDir, err := vlt.GetDirectory()
		if err != nil {
			return nil, cobra.ShellCompDirectiveNoFileComp
		}

		// Collect unlocker IDs
		var completions []string

		unlockersDir := filepath.Join(vaultDir, "unlockers.d")

		for _, metadata := range unlockerMetadataList {
			// Get the actual unlocker ID by creating the unlocker instance
			id := findUnlockerIDByMetadata(fs, unlockersDir, metadata, false)
			if id != "" && strings.HasPrefix(id, toComplete) {
				completions = append(completions, id)
			}
		}

		return completions, cobra.ShellCompDirectiveNoFileComp
	}
}

// getVaultNamesCompletionFunc returns a completion function that provides
// vault names
func getVaultNamesCompletionFunc(fs afero.Fs, stateDir string) func(
	cmd *cobra.Command, args []string, toComplete string,
) ([]string, cobra.ShellCompDirective) {
	return func(
		_ *cobra.Command, _ []string, toComplete string,
	) ([]string, cobra.ShellCompDirective) {
		vaults, err := vault.ListVaults(fs, stateDir)
		if err != nil {
			return nil, cobra.ShellCompDirectiveNoFileComp
		}

		var completions []string

		for _, v := range vaults {
			if strings.HasPrefix(v, toComplete) {
				completions = append(completions, v)
			}
		}

		return completions, cobra.ShellCompDirectiveNoFileComp
	}
}

// completeVaultQualifiedSecrets completes "vault:secret" references once a
// colon is present in the input
func completeVaultQualifiedSecrets(
	fs afero.Fs, stateDir, toComplete string,
) []string {
	var completions []string

	// Complete secret names for the specified vault
	parts := strings.SplitN(toComplete, ":", vaultSecretParts)
	vaultName := parts[0]
	secretPrefix := parts[1]

	vlt := vault.NewVault(fs, stateDir, vaultName)

	secrets, err := vlt.ListSecrets()
	if err == nil {
		for _, secretName := range secrets {
			if strings.HasPrefix(secretName, secretPrefix) {
				completions = append(completions, vaultName+":"+secretName)
			}
		}
	}

	return completions
}

// completeUnqualifiedVaultSecrets completes vault names (with a ":"
// suffix) and secrets from the current vault
func completeUnqualifiedVaultSecrets(
	fs afero.Fs, stateDir, toComplete string,
) []string {
	var completions []string

	// Complete vault names with ":" suffix
	vaults, err := vault.ListVaults(fs, stateDir)
	if err == nil {
		for _, v := range vaults {
			if strings.HasPrefix(v, toComplete) {
				completions = append(completions, v+":")
			}
		}
	}

	// Also complete secrets from current vault (for within-vault moves)
	currentVlt, err := vault.GetCurrentVault(fs, stateDir)
	if err == nil {
		secrets, err := currentVlt.ListSecrets()
		if err == nil {
			for _, secretName := range secrets {
				if strings.HasPrefix(secretName, toComplete) {
					completions = append(completions, secretName)
				}
			}
		}
	}

	return completions
}

// getVaultSecretCompletionFunc returns a completion function for the
// vault:secret format. It completes vault names with ":" suffix, and
// after ":" it completes secrets from that vault.
func getVaultSecretCompletionFunc(fs afero.Fs, stateDir string) func(
	cmd *cobra.Command, args []string, toComplete string,
) ([]string, cobra.ShellCompDirective) {
	return func(
		_ *cobra.Command, _ []string, toComplete string,
	) ([]string, cobra.ShellCompDirective) {
		// Check if we're completing after a vault: prefix
		if strings.Contains(toComplete, ":") {
			return completeVaultQualifiedSecrets(fs, stateDir, toComplete),
				cobra.ShellCompDirectiveNoFileComp
		}

		return completeUnqualifiedVaultSecrets(fs, stateDir, toComplete),
			cobra.ShellCompDirectiveNoSpace
	}
}