package webhook

import (
	"context"
	"fmt"
	"strings"
	"time"

	"gitea.oblak.solutions/dimitar/gitFlow/internal/httpclient"
)

// DiscordSender posts to a Discord webhook URL using a single rich embed.
type DiscordSender struct {
	cfg  Config
	http *httpclient.Client
}

func newDiscord(cfg Config) *DiscordSender {
	return &DiscordSender{cfg: cfg, http: httpclient.New(httpclient.WithTimeout(cfg.TimeoutOrDefault()))}
}

func (s *DiscordSender) Name() string { return s.cfg.Name }

type discordMessage struct {
	Embeds []discordEmbed `json:"embeds"`
}

type discordEmbed struct {
	Title       string         `json:"title"`
	Description string         `json:"description"`
	Color       int            `json:"color"`
	Footer      *discordFooter `json:"footer,omitempty"`
	Timestamp   string         `json:"timestamp,omitempty"`
}

type discordFooter struct {
	Text string `json:"text"`
}

// Status-to-color mapping: green=clean, yellow=attention, red=errors.
func embedColor(s Payload) int {
	switch {
	case s.Summary.Errored > 0:
		return 15158332 // red
	case s.Summary.Attention > 0:
		return 16776960 // yellow
	default:
		return 3066993 // green
	}
}

func (s *DiscordSender) Send(ctx context.Context, payload Payload) error {
	msg := discordMessage{
		Embeds: []discordEmbed{{
			Title:       "gitflow scan",
			Description: discordBody(payload),
			Color:       embedColor(payload),
			Footer:      &discordFooter{Text: "gitflow"},
			Timestamp:   payload.Timestamp.Format(time.RFC3339),
		}},
	}
	return s.http.PostJSON(ctx, s.cfg.URL, nil, msg, nil)
}

func discordBody(p Payload) string {
	var b strings.Builder
	s := p.Summary
	fmt.Fprintf(&b, "**%s** — %d repos: %d clean, %d attention, %d errors\n\n",
		p.ParentDir, s.Total, s.Clean, s.Attention, s.Errored)
	if len(p.Changed) > 0 {
		b.WriteString("**Changed:**\n")
		for _, r := range p.Changed {
			sym := statusSymbol(r.Status)
			line := fmt.Sprintf("%s **%s** — %s (%s)", sym, r.Name, r.Status, r.Branch)
			if r.AheadBy > 0 || r.BehindBy > 0 {
				line += fmt.Sprintf(" +%d/-%d", r.AheadBy, r.BehindBy)
			}
			if n := r.FileCount(); n > 0 {
				line += fmt.Sprintf(" %d file(s)", n)
			}
			b.WriteString(line + "\n")
		}
	}
	return b.String()
}