package seasonsview

import "git.haelnorr.com/h/oslstats/internal/db"
import "git.haelnorr.com/h/oslstats/internal/permissions"
import "git.haelnorr.com/h/oslstats/internal/contexts"
import "git.haelnorr.com/h/oslstats/internal/view/baseview"
import "git.haelnorr.com/h/oslstats/internal/view/component/links"
import "fmt"
import "sort"
import "strings"

// seriesTeamName returns a display name for a team in the series, or "TBD" if nil
func seriesTeamName(team *db.Team) string {
	if team == nil {
		return "TBD"
	}
	return team.Name
}

// seriesTeamShortName returns a short name for a team in the series, or "TBD" if nil
func seriesTeamShortName(team *db.Team) string {
	if team == nil {
		return "TBD"
	}
	return team.ShortName
}

// roundDisplayName converts a round slug to a human-readable name
func roundDisplayName(round string) string {
	switch round {
	case "upper_bracket":
		return "Upper Bracket"
	case "lower_bracket":
		return "Lower Bracket"
	case "upper_final":
		return "Upper Final"
	case "lower_final":
		return "Lower Final"
	case "quarter_final":
		return "Quarter Final"
	case "semi_final":
		return "Semi Final"
	case "elimination_final":
		return "Elimination Final"
	case "qualifying_final":
		return "Qualifying Final"
	case "preliminary_final":
		return "Preliminary Final"
	case "third_place":
		return "Third Place Playoff"
	case "grand_final":
		return "Grand Final"
	default:
		return strings.ReplaceAll(round, "_", " ")
	}
}

// SeriesDetailLayout renders the series detail page layout with header and
// tab navigation. Tab content is rendered as children.
templ SeriesDetailLayout(activeTab string, series *db.PlayoffSeries, schedule *db.PlayoffSeriesSchedule) {
	{{
		backURL := fmt.Sprintf("/seasons/%s/leagues/%s/finals",
			series.Bracket.Season.ShortName, series.Bracket.League.ShortName)
		isCompleted := series.Status == db.SeriesStatusCompleted
		team1Name := seriesTeamName(series.Team1)
		team2Name := seriesTeamName(series.Team2)
		boLabel := fmt.Sprintf("BO%d", series.MatchesToWin*2-1)
	}}
	@baseview.Layout(fmt.Sprintf("%s — %s vs %s", series.Label, team1Name, team2Name)) {
		<div class="max-w-screen-lg mx-auto px-4 py-8">
			<!-- Header -->
			<div class="bg-mantle border border-surface1 rounded-lg overflow-hidden mb-6">
				<div class="bg-surface0 border-b border-surface1 px-6 py-8">
					<div class="flex flex-col sm:flex-row justify-between items-start sm:items-center gap-4">
						<div>
							<div class="flex items-center gap-4 mb-2">
								<h1 class="text-3xl font-bold text-text">
									{ team1Name }
									<span class="text-subtext0 font-normal">vs</span>
									{ team2Name }
								</h1>
							</div>
							<div class="flex items-center gap-2 flex-wrap">
								<span class="px-2 py-0.5 bg-yellow/20 text-yellow rounded text-xs font-medium">
									{ series.Label }
								</span>
								<span class="px-2 py-0.5 bg-surface1 text-subtext0 rounded text-xs font-mono">
									{ boLabel }
								</span>
								if series.Team1Seed != nil || series.Team2Seed != nil {
									<span class="px-2 py-0.5 bg-surface1 text-subtext0 rounded text-xs font-mono">
										if series.Team1Seed != nil && series.Team2Seed != nil {
											Seed { fmt.Sprint(*series.Team1Seed) } vs { fmt.Sprint(*series.Team2Seed) }
										} else if series.Team1Seed != nil {
											Seed { fmt.Sprint(*series.Team1Seed) }
										} else if series.Team2Seed != nil {
											Seed { fmt.Sprint(*series.Team2Seed) }
										}
									</span>
								}
								<span class="text-subtext1 text-sm">
									{ series.Bracket.Season.Name } — { series.Bracket.League.Name }
								</span>
							</div>
						</div>
						<a
							href={ templ.SafeURL(backURL) }
							class="rounded-lg px-4 py-2 hover:cursor-pointer text-center
								bg-surface1 hover:bg-surface2 text-text transition"
						>
							Back to Bracket
						</a>
					</div>
				</div>
				<!-- Tab Navigation -->
				<nav class="bg-surface0 border-b border-surface1" data-tab-nav="series-detail-content">
					<ul class="flex flex-wrap">
						@seriesTabItem("overview", "Overview", activeTab, series)
						if isCompleted {
							@seriesTabItem("analysis", "Match Analysis", activeTab, series)
						} else {
							@seriesTabItem("preview", "Match Preview", activeTab, series)
							@seriesTabItem("scheduling", "Schedule", activeTab, series)
						}
					</ul>
				</nav>
			</div>
			<!-- Content Area -->
			<main id="series-detail-content">
				{ children... }
			</main>
		</div>
		<script src="/static/js/tabs.js" defer></script>
	}
}

templ seriesTabItem(section string, label string, activeTab string, series *db.PlayoffSeries) {
	{{
		isActive := section == activeTab
		baseClasses := "inline-block px-6 py-3 transition-colors cursor-pointer border-b-2"
		activeClasses := "border-blue text-blue font-semibold"
		inactiveClasses := "border-transparent text-subtext0 hover:text-text hover:border-surface2"
		url := fmt.Sprintf("/series/%d/%s", series.ID, section)
	}}
	<li class="inline-block">
		<a
			href={ templ.SafeURL(url) }
			hx-post={ url }
			hx-target="#series-detail-content"
			hx-swap="innerHTML"
			hx-push-url={ url }
			class={ baseClasses, templ.KV(activeClasses, isActive), templ.KV(inactiveClasses, !isActive) }
		>
			{ label }
		</a>
	</li>
}

// ==================== Full page wrappers (for GET requests / direct navigation) ====================

templ SeriesDetailOverviewPage(
	series *db.PlayoffSeries,
	currentSchedule *db.PlayoffSeriesSchedule,
	canSchedule bool,
	userTeamID int,
	rosters map[string][]*db.PlayerWithPlayStatus,
) {
	@SeriesDetailLayout("overview", series, currentSchedule) {
		@SeriesDetailOverviewContent(series, currentSchedule, canSchedule, userTeamID, rosters)
	}
}

templ SeriesDetailPreviewPage(
	series *db.PlayoffSeries,
	currentSchedule *db.PlayoffSeriesSchedule,
	rosters map[string][]*db.PlayerWithPlayStatus,
	previewData *db.MatchPreviewData,
) {
	@SeriesDetailLayout("preview", series, currentSchedule) {
		@SeriesDetailPreviewContent(series, rosters, previewData)
	}
}

templ SeriesDetailAnalysisPage(
	series *db.PlayoffSeries,
	currentSchedule *db.PlayoffSeriesSchedule,
	rosters map[string][]*db.PlayerWithPlayStatus,
	previewData *db.MatchPreviewData,
) {
	@SeriesDetailLayout("analysis", series, currentSchedule) {
		@SeriesDetailAnalysisContent(series, rosters, previewData)
	}
}

templ SeriesDetailSchedulePage(
	series *db.PlayoffSeries,
	currentSchedule *db.PlayoffSeriesSchedule,
	history []*db.PlayoffSeriesSchedule,
	canSchedule bool,
	userTeamID int,
) {
	@SeriesDetailLayout("scheduling", series, currentSchedule) {
		@SeriesDetailScheduleContent(series, currentSchedule, history, canSchedule, userTeamID)
	}
}

// ==================== Tab content components (for POST requests / HTMX swaps) ====================

templ SeriesDetailOverviewContent(
	series *db.PlayoffSeries,
	currentSchedule *db.PlayoffSeriesSchedule,
	canSchedule bool,
	userTeamID int,
	rosters map[string][]*db.PlayerWithPlayStatus,
) {
	{{
		permCache := contexts.Permissions(ctx)
		canManage := permCache.HasPermission(permissions.PlayoffsManage)
	}}
	@seriesOverviewTab(series, currentSchedule, rosters, canSchedule, canManage, userTeamID)
}

templ SeriesDetailPreviewContent(
	series *db.PlayoffSeries,
	rosters map[string][]*db.PlayerWithPlayStatus,
	previewData *db.MatchPreviewData,
) {
	@seriesMatchPreviewTab(series, rosters, previewData)
}

templ SeriesDetailAnalysisContent(
	series *db.PlayoffSeries,
	rosters map[string][]*db.PlayerWithPlayStatus,
	previewData *db.MatchPreviewData,
) {
	@seriesMatchAnalysisTab(series, rosters, previewData)
}

templ SeriesDetailScheduleContent(
	series *db.PlayoffSeries,
	currentSchedule *db.PlayoffSeriesSchedule,
	history []*db.PlayoffSeriesSchedule,
	canSchedule bool,
	userTeamID int,
) {
	{{
		permCache := contexts.Permissions(ctx)
		canManage := permCache.HasPermission(permissions.PlayoffsManage)
	}}
	@seriesScheduleTab(series, currentSchedule, history, canSchedule, canManage, userTeamID)
}

// ==================== Overview Tab ====================
templ seriesOverviewTab(
	series *db.PlayoffSeries,
	currentSchedule *db.PlayoffSeriesSchedule,
	rosters map[string][]*db.PlayerWithPlayStatus,
	canSchedule bool,
	canManage bool,
	userTeamID int,
) {
	{{
		isCompleted := series.Status == db.SeriesStatusCompleted
		isBye := series.Status == db.SeriesStatusBye
		bothTeamsAssigned := series.Team1ID != nil && series.Team2ID != nil
		showUploadPrompt := canManage && !isCompleted && !isBye && bothTeamsAssigned
	}}
	<div class="space-y-6">
		<!-- Series Score + Schedule Row -->
		<div class="grid grid-cols-1 lg:grid-cols-3 gap-6">
			<div class="lg:col-span-2">
				@seriesScoreDisplay(series)
			</div>
			<div>
				@seriesScheduleSummary(series, currentSchedule)
			</div>
		</div>

		<!-- Upload Prompt (for admins when series is in progress) -->
		if showUploadPrompt {
			@seriesUploadPrompt(series)
		}

		<!-- Match List -->
		if len(series.Matches) > 0 {
			@seriesMatchList(series)
		}

		<!-- Series Context -->
		@seriesContextCard(series)

		<!-- Team Rosters -->
		<div class="grid grid-cols-1 md:grid-cols-2 gap-6">
			if series.Team1 != nil {
				@seriesTeamSection(series.Team1, rosters["team1"], series.Bracket.Season, series.Bracket.League)
			}
			if series.Team2 != nil {
				@seriesTeamSection(series.Team2, rosters["team2"], series.Bracket.Season, series.Bracket.League)
			}
		</div>
	</div>
}

templ seriesUploadPrompt(series *db.PlayoffSeries) {
	{{
		// Check if there are pending results waiting for review
		hasPendingMatches := false
		for _, match := range series.Matches {
			if match.FixtureID != nil && match.Status == "pending" {
				hasPendingMatches = true
				break
			}
		}
	}}
	<div class="bg-mantle border border-surface1 rounded-lg p-6 text-center">
		if hasPendingMatches {
			<div class="text-4xl mb-3">📋</div>
			<p class="text-lg text-text font-medium mb-2">Results Pending Review</p>
			<p class="text-sm text-subtext1 mb-4">Uploaded results are waiting to be reviewed and finalized.</p>
			<a
				href={ templ.SafeURL(fmt.Sprintf("/series/%d/results/review", series.ID)) }
				class="inline-block px-4 py-2 bg-green hover:bg-green/75 text-mantle rounded-lg
					font-medium transition hover:cursor-pointer"
			>
				Review Results
			</a>
		} else {
			<div class="text-4xl mb-3">📋</div>
			<p class="text-lg text-text font-medium mb-2">No Results Uploaded</p>
			<p class="text-sm text-subtext1 mb-4">Upload match log files to record the series results.</p>
			<a
				href={ templ.SafeURL(fmt.Sprintf("/series/%d/results/upload", series.ID)) }
				class="inline-block px-4 py-2 bg-blue hover:bg-blue/80 text-mantle rounded-lg
					font-medium transition hover:cursor-pointer"
			>
				Upload Match Logs
			</a>
		}
	</div>
}

templ seriesScoreDisplay(series *db.PlayoffSeries) {
	{{
		isCompleted := series.Status == db.SeriesStatusCompleted
		team1Won := series.WinnerTeamID != nil && series.Team1ID != nil && *series.WinnerTeamID == *series.Team1ID
		team2Won := series.WinnerTeamID != nil && series.Team2ID != nil && *series.WinnerTeamID == *series.Team2ID
		isBye := series.Status == db.SeriesStatusBye
	}}
	<div class="bg-mantle border border-surface1 rounded-lg overflow-hidden">
		<div class="bg-surface0 border-b border-surface1 px-4 py-3 flex items-center justify-between">
			<h2 class="text-lg font-bold text-text">Series Score</h2>
			<div class="flex items-center gap-2">
				@seriesStatusBadge(series.Status)
				@seriesFormatBadge(series.MatchesToWin)
			</div>
		</div>
		<div class="p-6">
			if isBye {
				<div class="text-center py-4">
					<p class="text-lg text-subtext0">Bye — team advances automatically</p>
				</div>
			} else if series.Team1 == nil && series.Team2 == nil {
				<div class="text-center py-4">
					<p class="text-lg text-subtext0">Teams not yet determined</p>
				</div>
			} else {
				<div class="flex items-center justify-center gap-6 py-4">
					<div class="flex items-center gap-3">
						if team1Won {
							<span class="text-2xl">&#127942;</span>
						}
						if series.Team1 != nil && series.Team1.Color != "" {
							<span
								class="px-2.5 py-1 rounded text-sm font-bold"
								style={ fmt.Sprintf("background-color: %s22; color: %s; border: 1px solid %s44",
									series.Team1.Color, series.Team1.Color, series.Team1.Color) }
							>
								{ seriesTeamShortName(series.Team1) }
							</span>
						} else {
							<span class="px-2.5 py-1 bg-surface1 text-text rounded text-sm font-bold">
								{ seriesTeamShortName(series.Team1) }
							</span>
						}
						<span class="text-4xl font-bold text-text">{ fmt.Sprint(series.Team1Wins) }</span>
					</div>
					<div class="flex flex-col items-center">
						<span class="text-4xl text-subtext0 font-light leading-none">–</span>
						if isCompleted {
							<span class="px-1.5 py-0.5 bg-green/20 text-green rounded text-xs font-semibold mt-1">
								FINAL
							</span>
						}
					</div>
					<div class="flex items-center gap-3">
						<span class="text-4xl font-bold text-text">{ fmt.Sprint(series.Team2Wins) }</span>
						if series.Team2 != nil && series.Team2.Color != "" {
							<span
								class="px-2.5 py-1 rounded text-sm font-bold"
								style={ fmt.Sprintf("background-color: %s22; color: %s; border: 1px solid %s44",
									series.Team2.Color, series.Team2.Color, series.Team2.Color) }
							>
								{ seriesTeamShortName(series.Team2) }
							</span>
						} else {
							<span class="px-2.5 py-1 bg-surface1 text-text rounded text-sm font-bold">
								{ seriesTeamShortName(series.Team2) }
							</span>
						}
						if team2Won {
							<span class="text-2xl">&#127942;</span>
						}
					</div>
				</div>
			}
		</div>
	</div>
}

templ seriesScheduleSummary(series *db.PlayoffSeries, schedule *db.PlayoffSeriesSchedule) {
	{{
		isCompleted := series.Status == db.SeriesStatusCompleted
	}}
	<div class="bg-mantle border border-surface1 rounded-lg overflow-hidden h-full">
		<div class="bg-surface0 border-b border-surface1 px-4 py-3">
			<h2 class="text-lg font-bold text-text">Schedule</h2>
		</div>
		<div class="p-4 flex flex-col justify-center h-[calc(100%-3rem)]">
			if schedule == nil {
				<div class="text-center">
					<p class="text-subtext1 text-sm">No time scheduled</p>
				</div>
			} else if schedule.Status == db.ScheduleStatusAccepted && schedule.ScheduledTime != nil {
				<div class="text-center space-y-2">
					if isCompleted {
						<span class="px-2 py-0.5 bg-blue/20 text-blue rounded text-xs font-medium">
							Played
						</span>
					} else {
						<span class="px-2 py-0.5 bg-green/20 text-green rounded text-xs font-medium">
							Confirmed
						</span>
					}
					<p class="text-text font-medium">
						@localtime(schedule.ScheduledTime, "date")
					</p>
					<p class="text-text text-lg font-bold">
						@localtime(schedule.ScheduledTime, "time")
					</p>
				</div>
			} else if schedule.Status == db.ScheduleStatusPending && schedule.ScheduledTime != nil {
				<div class="text-center space-y-2">
					<span class="px-2 py-0.5 bg-yellow/20 text-yellow rounded text-xs font-medium">
						Proposed
					</span>
					<p class="text-text font-medium">
						@localtime(schedule.ScheduledTime, "date")
					</p>
					<p class="text-text text-lg font-bold">
						@localtime(schedule.ScheduledTime, "time")
					</p>
					<p class="text-subtext1 text-xs">Awaiting confirmation</p>
				</div>
			} else if schedule.Status == db.ScheduleStatusCancelled {
				<div class="text-center space-y-2">
					<span class="px-2 py-0.5 bg-red/20 text-red rounded text-xs font-medium">
						Cancelled
					</span>
					if schedule.RescheduleReason != nil {
						<p class="text-subtext1 text-xs">{ *schedule.RescheduleReason }</p>
					}
				</div>
			} else {
				<div class="text-center">
					<p class="text-subtext1 text-sm">No time confirmed</p>
				</div>
			}
		</div>
	</div>
}

templ seriesMatchList(series *db.PlayoffSeries) {
	<div class="bg-mantle border border-surface1 rounded-lg overflow-hidden">
		<div class="bg-surface0 border-b border-surface1 px-4 py-3">
			<h2 class="text-lg font-bold text-text">Matches</h2>
		</div>
		<div class="divide-y divide-surface1">
			for _, match := range series.Matches {
				@seriesMatchRow(series, match)
			}
		</div>
	</div>
}

templ seriesMatchRow(series *db.PlayoffSeries, match *db.PlayoffMatch) {
	{{
		matchLabel := fmt.Sprintf("Game %d", match.MatchNumber)
		isPending := match.Status == "pending"
		isCompleted := match.Status == "completed"
		hasFixture := match.FixtureID != nil
		_ = hasFixture
	}}
	<div class="flex items-center justify-between px-4 py-3 hover:bg-surface0 transition-colors">
		<div class="flex items-center gap-3">
			<span class="text-sm font-medium text-text">{ matchLabel }</span>
			if isPending {
				<span class="px-1.5 py-0.5 bg-surface1 text-subtext0 rounded text-xs">
					Pending
				</span>
			} else if isCompleted {
				<span class="px-1.5 py-0.5 bg-green/20 text-green rounded text-xs">
					Complete
				</span>
			} else {
				<span class="px-1.5 py-0.5 bg-blue/20 text-blue rounded text-xs">
					{ match.Status }
				</span>
			}
		</div>
		if match.FixtureID != nil {
			<a
				href={ templ.SafeURL(fmt.Sprintf("/fixtures/%d/overview", *match.FixtureID)) }
				class="px-3 py-1 bg-surface1 hover:bg-surface2 text-text rounded text-xs
					font-medium transition hover:cursor-pointer"
			>
				View Details
			</a>
		}
	</div>
}

templ seriesContextCard(series *db.PlayoffSeries) {
	{{
		// Determine advancement info
		winnerAdvances := ""
		loserAdvances := ""

		if series.WinnerNextID != nil {
			// Look through bracket series for the target
			if series.Bracket != nil {
				for _, s := range series.Bracket.Series {
					if s.ID == *series.WinnerNextID {
						winnerAdvances = s.Label
						break
					}
				}
			}
			if winnerAdvances == "" {
				winnerAdvances = "next round"
			}
		}
		if series.LoserNextID != nil {
			if series.Bracket != nil {
				for _, s := range series.Bracket.Series {
					if s.ID == *series.LoserNextID {
						loserAdvances = s.Label
						break
					}
				}
			}
			if loserAdvances == "" {
				loserAdvances = "next round"
			}
		}
	}}
	<div class="bg-mantle border border-surface1 rounded-lg overflow-hidden">
		<div class="bg-surface0 border-b border-surface1 px-4 py-3">
			<h2 class="text-lg font-bold text-text">Series Info</h2>
		</div>
		<div class="p-4 space-y-3">
			<div class="flex items-center gap-3">
				<span class="text-sm text-subtext0 w-24 shrink-0">Round</span>
				<span class="text-sm font-medium text-text">{ roundDisplayName(series.Round) }</span>
			</div>
			<div class="flex items-center gap-3">
				<span class="text-sm text-subtext0 w-24 shrink-0">Format</span>
				<span class="text-sm font-medium text-text">Best of { fmt.Sprint(series.MatchesToWin*2 - 1) } (first to { fmt.Sprint(series.MatchesToWin) })</span>
			</div>
			if series.Team1Seed != nil && series.Team2Seed != nil {
				<div class="flex items-center gap-3">
					<span class="text-sm text-subtext0 w-24 shrink-0">Seeding</span>
					<span class="text-sm font-medium text-text">
						{ ordinal(*series.Team1Seed) } seed vs { ordinal(*series.Team2Seed) } seed
					</span>
				</div>
			}
			if winnerAdvances != "" {
				<div class="flex items-center gap-3">
					<span class="text-sm text-subtext0 w-24 shrink-0">Winner →</span>
					<span class="text-sm font-medium text-green">{ winnerAdvances }</span>
				</div>
			} else {
				<div class="flex items-center gap-3">
					<span class="text-sm text-subtext0 w-24 shrink-0">Winner →</span>
					<span class="text-sm font-medium text-yellow">Champion</span>
				</div>
			}
			if loserAdvances != "" {
				<div class="flex items-center gap-3">
					<span class="text-sm text-subtext0 w-24 shrink-0">Loser →</span>
					<span class="text-sm font-medium text-peach">{ loserAdvances }</span>
				</div>
			} else if series.WinnerNextID != nil {
				<div class="flex items-center gap-3">
					<span class="text-sm text-subtext0 w-24 shrink-0">Loser →</span>
					<span class="text-sm font-medium text-red">Eliminated</span>
				</div>
			}
		</div>
	</div>
}

templ seriesTeamSection(team *db.Team, players []*db.PlayerWithPlayStatus, season *db.Season, league *db.League) {
	{{
		// Sort with managers first
		sort.SliceStable(players, func(i, j int) bool {
			return players[i].IsManager && !players[j].IsManager
		})
	}}
	<div class="bg-mantle border border-surface1 rounded-lg overflow-hidden">
		<div class="bg-surface0 border-b border-surface1 px-4 py-3 flex items-center justify-between">
			<h3 class="text-md font-bold">
				@links.TeamNameLinkInSeason(team, season, league)
			</h3>
			if team.Color != "" {
				<span
					class="w-4 h-4 rounded-full border border-surface1"
					style={ fmt.Sprintf("background-color: %s", team.Color) }
				></span>
			}
		</div>
		if len(players) == 0 {
			<div class="p-4">
				<p class="text-subtext1 text-sm text-center py-2">No players on roster.</p>
			</div>
		} else {
			<div class="p-4">
				<div class="space-y-1">
					for _, p := range players {
						<div class="flex items-center gap-2 px-2 py-1.5 rounded hover:bg-surface0 transition">
							<span class="text-sm">
								@links.PlayerLink(p.Player)
							</span>
							if p.IsManager {
								<span class="px-1.5 py-0.5 bg-yellow/20 text-yellow rounded text-xs font-medium">
									&#9733; Manager
								</span>
							}
							if p.IsFreeAgent {
								<span class="px-1.5 py-0.5 bg-peach/20 text-peach rounded text-xs font-medium">
									FREE AGENT
								</span>
							}
						</div>
					}
				</div>
			</div>
		}
	</div>
}