package cmd

import (
	"encoding/json"
	"fmt"
	"regexp"
	"strings"

	"github.com/lerko/nib/internal/db"
	"github.com/lerko/nib/internal/display"
	"github.com/spf13/cobra"
)

var promoteCmd = &cobra.Command{
	Use:   "promote <id> [type]",
	Short: "promote a fluid entity to a card",
	Args:  cobra.RangeArgs(1, 2),
	RunE:  runPromote,
}

func init() {
	rootCmd.AddCommand(promoteCmd)
}

func runPromote(_ *cobra.Command, args []string) error {
	store, err := openStore()
	if err != nil {
		return err
	}
	defer store.Close()

	id, err := store.Resolve(args[0])
	if err != nil {
		return fmt.Errorf("not_found — no entity with id %s", args[0])
	}

	cardType := db.CardSnippet
	if len(args) > 1 {
		if !db.ValidCardType(args[1]) {
			return fmt.Errorf("invalid_type — %q is not a valid card type", args[1])
		}
		cardType = db.CardType(args[1])
	}

	e, err := store.Get(id)
	if err != nil {
		return err
	}

	cardData := generateCardData(cardType, e.Body)

	if err := store.Promote(id, cardType, cardData); err != nil {
		if err == db.ErrAlreadyPromoted {
			return fmt.Errorf("invalid_promote — entity %s is already a %s",
				display.FormatID(id), *e.CardType)
		}
		return err
	}

	fmt.Printf("promoted %s → %s\n", display.FormatID(id), cardType)
	return nil
}

var templateSlotRe = regexp.MustCompile(`\$\{(\w+)\}`)

func generateCardData(ct db.CardType, body string) *string {
	var data string
	switch ct {
	case db.CardTemplate:
		matches := templateSlotRe.FindAllStringSubmatch(body, -1)
		type slot struct {
			Name    string `json:"name"`
			Default string `json:"default"`
		}
		var slots []slot
		seen := map[string]bool{}
		for _, m := range matches {
			name := m[1]
			if !seen[name] {
				slots = append(slots, slot{Name: name, Default: ""})
				seen[name] = true
			}
		}
		if slots == nil {
			slots = []slot{}
		}
		b, _ := json.Marshal(map[string]any{"slots": slots})
		data = string(b)

	case db.CardChecklist:
		type step struct {
			Text string `json:"text"`
			Done bool   `json:"done"`
		}
		var steps []step
		for _, line := range strings.Split(body, "\n") {
			line = strings.TrimSpace(line)
			if strings.HasPrefix(line, "[ ]") || strings.HasPrefix(line, "[x]") {
				text := strings.TrimSpace(line[3:])
				done := strings.HasPrefix(line, "[x]")
				steps = append(steps, step{Text: text, Done: done})
			}
		}
		if steps == nil {
			steps = []step{{Text: body, Done: false}}
		}
		b, _ := json.Marshal(map[string]any{"steps": steps})
		data = string(b)

	case db.CardDecision:
		b, _ := json.Marshal(map[string]any{
			"chose":    "",
			"why":      "",
			"rejected": []string{},
		})
		data = string(b)

	case db.CardLink:
		url := ""
		for _, word := range strings.Fields(body) {
			if strings.HasPrefix(word, "http://") || strings.HasPrefix(word, "https://") {
				url = word
				break
			}
		}
		b, _ := json.Marshal(map[string]any{"url": url})
		data = string(b)

	default:
		data = "{}"
	}
	return &data
}