package main

import (
	"context"
	"fmt"
	"os"

	"github.com/spf13/cobra"

	"gitea.oblak.solutions/dimitar/gitFlow/internal/ai"
	"gitea.oblak.solutions/dimitar/gitFlow/internal/app"
	"gitea.oblak.solutions/dimitar/gitFlow/internal/config"
	"gitea.oblak.solutions/dimitar/gitFlow/internal/presenter"
	"gitea.oblak.solutions/dimitar/gitFlow/internal/rules"
	"gitea.oblak.solutions/dimitar/gitFlow/pkg/status"
)

// newScanCmd runs a single scan pass and renders the result.
func newScanCmd() *cobra.Command {
	cmd := &cobra.Command{
		Use:   "scan",
		Short: "Scan repositories under a directory once",
		Args:  cobra.NoArgs,
		RunE: func(cmd *cobra.Command, _ []string) error {
			cfg, err := config.Load(cmd.Flags())
			if err != nil {
				return err
			}
			// The README asks for the parent directory interactively;
			// prompt only when nothing was provided and stdin is a TTY.
			if !cmd.Flags().Changed("dir") && isTerminal(os.Stdin) {
				if d, err := promptDir(cfg.Dir); err == nil {
					cfg.Dir = d
				}
			}

			ctx, stop := signalContext()
			defer stop()

			a, err := app.New(cfg)
			if err != nil {
				return err
			}
			result, err := a.ScanOnce(ctx)
			if err != nil {
				return err
			}

			opts := presenter.Options{
				Color: presenter.ParseColorMode(cfg.Color),
				Theme: presenter.ParseTheme(cfg.Theme),
			}
			if err := presenter.Present(os.Stdout, cfg.Format, result, opts); err != nil {
				return err
			}

			// AI suggestions are a human-facing section; they are skipped
			// in JSON mode so the machine-readable stream stays clean.
			if cfg.AI.Enabled && cfg.Format != "json" {
				renderSuggestions(ctx, cfg, opts, result)
			}
			if err := renderRuleFlags(opts, cfg, result); err != nil {
				return err
			}
			return nil
		},
	}
	config.RegisterFlags(cmd.Flags())
	return cmd
}

// renderSuggestions asks the configured AI provider for next actions,
// renders them, and — when enabled — runs confirmed commands. Failures are
// warnings: a scan result is still useful without AI.
func renderSuggestions(ctx context.Context, cfg *config.Config, opts presenter.Options, result status.ScanResult) {
	provider, err := ai.NewProvider(cfg.AI)
	if err != nil {
		fmt.Fprintf(os.Stderr, "warning: %v\n", err)
		return
	}
	suggestions, err := provider.Suggest(ctx, result)
	if err != nil {
		fmt.Fprintf(os.Stderr, "warning: AI suggestions unavailable: %v\n", err)
		return
	}
	if err := presenter.Suggestions(os.Stdout, opts, suggestions); err != nil {
		fmt.Fprintf(os.Stderr, "warning: %v\n", err)
		return
	}
	if cfg.AI.Execute && isTerminal(os.Stdin) {
		if err := ai.RunConfirmed(ctx, suggestions, confirmSuggestion); err != nil {
			fmt.Fprintf(os.Stderr, "warning: %v\n", err)
		}
	}
}

// confirmSuggestion asks the user to approve running a suggested command.
func confirmSuggestion(s ai.Suggestion) (bool, error) {
	return promptYesNo(false, "Run in %s: $ %s", s.RepoPath, s.Command)
}

// renderRuleFlags evaluates the configured rules and renders any matches.
func renderRuleFlags(opts presenter.Options, cfg *config.Config, result status.ScanResult) error {
	if len(cfg.Rules) == 0 {
		return nil
	}
	flags, err := rules.Eval(cfg.Rules, result)
	if err != nil {
		return err
	}
	return presenter.Flags(os.Stdout, opts, flags)
}

// newConfigCmd prints the effective configuration.
func newConfigCmd() *cobra.Command {
	cmd := &cobra.Command{
		Use:   "config",
		Short: "Show the effective configuration",
		Args:  cobra.NoArgs,
		RunE: func(cmd *cobra.Command, _ []string) error {
			cfg, err := config.Load(cmd.Flags())
			if err != nil {
				return err
			}
			out, err := cfg.Dump()
			if err != nil {
				return err
			}
			fmt.Print(out)
			return nil
		},
	}
	config.RegisterFlags(cmd.Flags())
	return cmd
}