package main

import (
	"fmt"
	"os"

	"git.hangman-lab.top/zhi/HarborForge.Cli/internal/commands"
	"git.hangman-lab.top/zhi/HarborForge.Cli/internal/help"
	"git.hangman-lab.top/zhi/HarborForge.Cli/internal/mode"
	"git.hangman-lab.top/zhi/HarborForge.Cli/internal/output"
)

func main() {
	args := os.Args[1:]

	// Parse global flags first
	args = parseGlobalFlags(args)

	if len(args) == 0 {
		fmt.Print(help.RenderTopHelp(commands.Version, help.CommandSurface()))
		return
	}

	switch args[0] {
	case "--help", "-h":
		fmt.Print(help.RenderTopHelp(commands.Version, help.CommandSurface()))
	case "--help-brief":
		fmt.Print(help.RenderTopHelpBrief(commands.Version, help.CommandSurface()))
	case "version":
		handleLeafOrRun("version", args[1:], commands.RunVersion)
	case "health":
		handleLeafOrRun("health", args[1:], commands.RunHealth)
	case "config":
		handleConfig(args[1:])
	default:
		if group, ok := findGroup(args[0]); ok {
			handleGroup(group, args[1:])
			return
		}
		fmt.Fprintf(os.Stderr, "unknown command: %s\n", args[0])
		fmt.Fprintf(os.Stderr, "Run 'hf --help' for usage.\n")
		os.Exit(1)
	}
}

// parseGlobalFlags extracts --json from anywhere in the args and returns remaining args.
func parseGlobalFlags(args []string) []string {
	var remaining []string
	for _, a := range args {
		switch a {
		case "--json":
			output.JSONMode = true
		default:
			remaining = append(remaining, a)
		}
	}
	return remaining
}

func handleLeafOrRun(name string, args []string, run func()) {
	if isHelpFlagOnly(args) {
		fmt.Printf("hf %s\n", name)
		return
	}
	if len(args) > 0 {
		output.Errorf("unknown arguments for %s: %v", name, args)
	}
	run()
}

func handleConfig(args []string) {
	if isHelpFlagOnly(args) {
		runConfigHelp()
		return
	}
	if len(args) == 0 {
		commands.RunConfigShow()
		return
	}
	for i := 0; i < len(args); i++ {
		switch args[i] {
		case "--url":
			if i+1 >= len(args) {
				output.Error("usage: hf config --url <hf-url>")
			}
			commands.RunConfigURL(args[i+1])
			return
		case "--acc-mgr-token":
			if i+1 >= len(args) {
				output.Error("usage: hf config --acc-mgr-token <token>")
			}
			commands.RunConfigAccMgrToken(args[i+1])
			return
		default:
			output.Errorf("unknown config flag: %s", args[i])
		}
	}
}

func runConfigHelp() {
	fmt.Println("hf config - View and manage CLI configuration")
	fmt.Println()
	fmt.Println("Usage:")
	fmt.Println("  hf config                    Show current config")
	fmt.Println("  hf config --url <hf-url>     Set HarborForge API URL")
	if !mode.IsPaddedCell() {
		fmt.Println("  hf config --acc-mgr-token <token>  Set account-manager token")
	}
}

func handleGroup(group help.Group, args []string) {
	if len(args) == 0 || isHelpFlagOnly(args) {
		fmt.Print(help.RenderGroupHelp(group.Name, group.SubCommands))
		return
	}
	if len(args) == 1 && args[0] == "--help-brief" {
		fmt.Print(help.RenderGroupHelpBrief(group.Name, group.SubCommands))
		return
	}

	sub, ok := findSubCommand(group, args[0])
	if !ok {
		output.Errorf("unknown %s subcommand: %s", group.Name, args[0])
	}

	if len(args) > 1 && isHelpFlagOnly(args[1:]) {
		if !sub.Permitted {
			fmt.Println(help.RenderNotPermitted(group.Name, sub.Name))
			return
		}
		fmt.Printf("hf %s %s\n", group.Name, sub.Name)
		return
	}

	if !sub.Permitted {
		fmt.Println(help.RenderNotPermitted(group.Name, sub.Name))
		return
	}

	// Dispatch implemented commands
	remaining := args[1:]
	switch group.Name {
	case "user":
		handleUserCommand(sub.Name, remaining)
		return
	}

	output.Errorf("hf %s %s is recognized but not implemented yet", group.Name, sub.Name)
}

func handleUserCommand(subCmd string, args []string) {
	// Extract --token and --acc-mgr-token flags from args
	tokenFlag := ""
	accMgrTokenFlag := ""
	var filtered []string
	for i := 0; i < len(args); i++ {
		switch args[i] {
		case "--token":
			if i+1 < len(args) {
				i++
				tokenFlag = args[i]
			}
		case "--acc-mgr-token":
			if i+1 < len(args) {
				i++
				accMgrTokenFlag = args[i]
			}
		default:
			filtered = append(filtered, args[i])
		}
	}

	switch subCmd {
	case "list":
		commands.RunUserList(tokenFlag)
	case "get":
		if len(filtered) < 1 {
			output.Error("usage: hf user get <username>")
		}
		commands.RunUserGet(filtered[0], tokenFlag)
	case "create":
		username, password, email, fullName := "", "", "", ""
		for i := 0; i < len(filtered); i++ {
			switch filtered[i] {
			case "--user":
				if i+1 < len(filtered) {
					i++
					username = filtered[i]
				}
			case "--pass":
				if i+1 < len(filtered) {
					i++
					password = filtered[i]
				}
			case "--email":
				if i+1 < len(filtered) {
					i++
					email = filtered[i]
				}
			case "--full-name":
				if i+1 < len(filtered) {
					i++
					fullName = filtered[i]
				}
			default:
				output.Errorf("unknown flag: %s", filtered[i])
			}
		}
		if username == "" {
			output.Error("usage: hf user create --user <username>")
		}
		commands.RunUserCreate(username, password, email, fullName, accMgrTokenFlag)
	case "update":
		if len(filtered) < 1 {
			output.Error("usage: hf user update <username> [--email ...] [--full-name ...] [--pass ...] [--active ...]")
		}
		commands.RunUserUpdate(filtered[0], filtered[1:], tokenFlag)
	case "activate":
		if len(filtered) < 1 {
			output.Error("usage: hf user activate <username>")
		}
		commands.RunUserActivate(filtered[0], tokenFlag)
	case "deactivate":
		if len(filtered) < 1 {
			output.Error("usage: hf user deactivate <username>")
		}
		commands.RunUserDeactivate(filtered[0], tokenFlag)
	case "delete":
		if len(filtered) < 1 {
			output.Error("usage: hf user delete <username>")
		}
		commands.RunUserDelete(filtered[0], tokenFlag)
	default:
		output.Errorf("hf user %s is not implemented yet", subCmd)
	}
}

func isHelpFlagOnly(args []string) bool {
	return len(args) == 1 && (args[0] == "--help" || args[0] == "-h")
}

func findGroup(name string) (help.Group, bool) {
	for _, group := range help.CommandSurface() {
		if group.Name == name {
			return group, true
		}
	}
	return help.Group{}, false
}

func findSubCommand(group help.Group, name string) (help.Command, bool) {
	for _, cmd := range group.SubCommands {
		if cmd.Name == name {
			return cmd, true
		}
	}
	return help.Command{}, false
}