package main

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

// Flags holds all parsed CLI flags.
type Flags struct {
	JSON      bool
	Domain    string
	IssueType string // --type
	Status    string
	Prio      string
	App       string
	Pattern   string
	Risk      string
}

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

	if len(args) == 0 {
		printUsage()
		os.Exit(0)
	}

	// Parse global flags and collect remaining args
	var noun, verb string
	var rest []string
	flags := Flags{}

	// First arg is noun, second is verb, rest are flags/args
	pos := 0
	for pos < len(args) {
		arg := args[pos]
		if strings.HasPrefix(arg, "--") {
			flag, val, ok := parseFlag(args, pos)
			pos += flag.consumed
			if !ok {
				fmt.Fprintf(os.Stderr, "unknown flag: %s\n", arg)
				os.Exit(1)
			}
			applyFlag(&flags, flag.name, val)
		} else {
			// Positional
			if noun == "" {
				noun = arg
			} else if verb == "" {
				verb = arg
			} else {
				rest = append(rest, arg)
			}
			pos++
		}
	}

	// Dispatch
	switch noun {
	case "issue":
		if verb == "" {
			fmt.Fprintln(os.Stderr, "usage: dev_console issue <list|show|status|board>")
			os.Exit(1)
		}
		cmdIssue(append([]string{verb}, rest...), flags)
	case "flow":
		if verb == "" {
			fmt.Fprintln(os.Stderr, "usage: dev_console flow <list|show|status>")
			os.Exit(1)
		}
		cmdFlow(append([]string{verb}, rest...), flags)
	case "work":
		if verb == "" {
			fmt.Fprintln(os.Stderr, "usage: dev_console work <today|dashboard>")
			os.Exit(1)
		}
		cmdWork(append([]string{verb}, rest...), flags)
	case "help", "--help", "-h":
		printUsage()
		os.Exit(0)
	default:
		fmt.Fprintf(os.Stderr, "unknown command: %s\n", noun)
		printUsage()
		os.Exit(1)
	}
}

type parsedFlag struct {
	name     string
	consumed int
}

func parseFlag(args []string, pos int) (parsedFlag, string, bool) {
	arg := args[pos]
	// Strip leading --
	name := strings.TrimPrefix(arg, "--")

	// Check for --key=value form
	if idx := strings.Index(name, "="); idx != -1 {
		key := name[:idx]
		val := name[idx+1:]
		return parsedFlag{name: key, consumed: 1}, val, true
	}

	// Boolean flags (no value)
	switch name {
	case "json":
		return parsedFlag{name: name, consumed: 1}, "true", true
	}

	// Flags that take a value
	switch name {
	case "domain", "type", "status", "prio", "app", "pattern", "risk", "epic", "days":
		if pos+1 < len(args) && !strings.HasPrefix(args[pos+1], "--") {
			return parsedFlag{name: name, consumed: 2}, args[pos+1], true
		}
		return parsedFlag{name: name, consumed: 1}, "", true
	}

	return parsedFlag{consumed: 1}, "", false
}

func applyFlag(flags *Flags, name, val string) {
	switch name {
	case "json":
		flags.JSON = true
	case "domain":
		flags.Domain = val
	case "type":
		flags.IssueType = val
	case "status":
		flags.Status = val
	case "prio":
		flags.Prio = val
	case "app":
		flags.App = val
	case "pattern":
		flags.Pattern = val
	case "risk":
		flags.Risk = val
	}
}

func printUsage() {
	fmt.Print(`dev_console — CLI unificado para issues + flows del registry

Usage:
  dev_console issue list [--domain X] [--type Y] [--status Z] [--prio P] [--json]
  dev_console issue show NNNN [--json]
  dev_console issue status NNNN [--json]
  dev_console issue board [--json]

  dev_console flow list [--app X] [--pattern P] [--risk R] [--json]
  dev_console flow show NNNN [--json]
  dev_console flow status NNNN [--json]

  dev_console work today [--json]
  dev_console work dashboard

Stubs (v2):
  issue dep|roadmap|tag|done|stale|create
  flow create|dod|trace|user-test|run|chain|done
  work weekly|search

Env:
  FN_REGISTRY_ROOT  Root of the fn_registry repo (auto-detected if not set)
`)
}

// mustRegistryRoot returns the registry root or exits.
func mustRegistryRoot() string {
	root, err := findRegistryRoot()
	if err != nil {
		fatalf("cannot find registry root: %v\nSet FN_REGISTRY_ROOT env var or run from within fn_registry.", err)
	}
	return root
}

// findRegistryRoot tries FN_REGISTRY_ROOT, then walks up from cwd looking for registry.db.
func findRegistryRoot() (string, error) {
	if r := os.Getenv("FN_REGISTRY_ROOT"); r != "" {
		return r, nil
	}

	cwd, err := os.Getwd()
	if err != nil {
		return "", err
	}

	dir := cwd
	for {
		if _, err := os.Stat(filepath.Join(dir, "registry.db")); err == nil {
			return dir, nil
		}
		parent := filepath.Dir(dir)
		if parent == dir {
			break
		}
		dir = parent
	}
	return "", fmt.Errorf("registry.db not found walking up from %s", cwd)
}

// fatalf prints an error to stderr and exits with code 1.
func fatalf(format string, args ...any) {
	fmt.Fprintf(os.Stderr, "error: "+format+"\n", args...)
	os.Exit(1)
}