package carddata

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

	"github.com/lerko/nib/internal/db"
)

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
}

func DetectCardType(body string) *db.CardType {
	if TemplateSlotRe.MatchString(body) {
		ct := db.CardTemplate
		return &ct
	}
	if strings.Contains(body, "chose:") || strings.Contains(body, "why:") {
		ct := db.CardDecision
		return &ct
	}
	if strings.Contains(body, "[ ]") || strings.Contains(body, "[x]") {
		ct := db.CardChecklist
		return &ct
	}
	for _, word := range strings.Fields(body) {
		if strings.HasPrefix(word, "http://") || strings.HasPrefix(word, "https://") {
			ct := db.CardLink
			return &ct
		}
	}
	return nil
}