package bot

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

	"github.com/bwmarrin/discordgo"

	"cycling-discord-bot/db"
)

func (b *Bot) handleLeaderboard(ctx context.Context, s *discordgo.Session, i *discordgo.InteractionCreate) {
	since := b.challengeStart(ctx, i.GuildID)
	entries, err := b.db.GetLeaderboard(ctx, i.GuildID, since, 10)
	if err != nil {
		respondEphemeral(s, i, "Error fetching leaderboard.")
		return
	}
	if len(entries) == 0 {
		respondEphemeral(s, i, "No distances logged yet. Get riding! 🚴")
		return
	}
	name, _, _ := b.db.GetSetting(ctx, i.GuildID, "challenge_name")
	if name == "" {
		name = "Fitness Challenge"
	}
	respond(s, i, leaderboardText(fmt.Sprintf("🚴 %s — Leaderboard", name), entries))
}

func (b *Bot) handleYearlyLeaderboard(ctx context.Context, s *discordgo.Session, i *discordgo.InteractionCreate) {
	year := time.Now().Year()
	entries, err := b.db.GetYearlyLeaderboard(ctx, i.GuildID, year, 10)
	if err != nil {
		respondEphemeral(s, i, "Error fetching yearly leaderboard.")
		return
	}
	if len(entries) == 0 {
		respondEphemeral(s, i, fmt.Sprintf("No distances logged in %d yet.", year))
		return
	}
	respond(s, i, leaderboardText(fmt.Sprintf("📅 %d Yearly Leaderboard", year), entries))
}

func (b *Bot) handleTotalKM(ctx context.Context, s *discordgo.Session, i *discordgo.InteractionCreate) {
	since := b.challengeStart(ctx, i.GuildID)
	total, err := b.db.GetTotalKM(ctx, i.GuildID, since)
	if err != nil {
		respondEphemeral(s, i, "Error fetching total.")
		return
	}

	yearStart := time.Date(time.Now().Year(), 1, 1, 0, 0, 0, 0, time.UTC)
	yearTotal, _ := b.db.GetTotalKM(ctx, i.GuildID, yearStart)

	name, _, _ := b.db.GetSetting(ctx, i.GuildID, "challenge_name")
	if name == "" {
		name = "Challenge"
	}

	var sb strings.Builder
	sb.WriteString("## 🌍 Distance Totals\n\n")
	sb.WriteString(fmt.Sprintf("**%s:** %.1f km\n", name, total))
	sb.WriteString(fmt.Sprintf("**%d total:** %.1f km\n\n", time.Now().Year(), yearTotal))

	if goalStr, ok, _ := b.db.GetSetting(ctx, i.GuildID, "challenge_goal_km"); ok {
		var goal float64
		fmt.Sscanf(goalStr, "%f", &goal)
		if goal > 0 {
			sb.WriteString(fmt.Sprintf("**Goal:** %.1f km %s\n\n", goal, progressBar(total, goal, 12)))
		}
	}
	sb.WriteString(distanceComparison(total))
	respond(s, i, sb.String())
}

func leaderboardText(title string, entries []*db.UserStats) string {
	medals := []string{"🥇", "🥈", "🥉"}
	var sb strings.Builder
	sb.WriteString(fmt.Sprintf("## %s\n\n", title))
	for idx, e := range entries {
		medal := "  "
		if idx < len(medals) {
			medal = medals[idx]
		}
		sb.WriteString(fmt.Sprintf("%s **%d.** %s — **%.1f km** (%d ride%s)\n",
			medal, idx+1, e.Username, e.TotalKM, e.LogCount, plural(e.LogCount)))
	}
	return sb.String()
}