#!/bin/bash
# -----------------------------------------------------------------------------------------------
# --------------------------------- Emby Session Report ----------------------------------------
# -----------------------------------------------------------------------------------------------
# Generates a weekly usage report from the Emby media server via its API.
# Queries activity logs, session history and library stats to produce a
# human-readable summary of what was watched, by whom and how.
#
# Report includes:
#   Total streams during the report period
#   Transcode vs direct play ratio
#   Live TV usage
#   Top N most watched content
#   Most active users
#   Peak concurrent streams
#
# No persistent writes — queries API fresh each run.
# All configuration in Master.conf under Emby Session Report section.
# Supports --dry-run to test API connectivity without sending notification.
# -----------------------------------------------------------------------------------------------

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

source "$SCRIPT_DIR/../Master.conf"
source "$SCRIPT_DIR/../common.sh"

parse_args "$@"

# -----------------------------------------------------------------------------------------------
# ━━━ $ICON_GEAR Setup ━━━
# -----------------------------------------------------------------------------------------------
echo ""
echo "━━━ $ICON_GEAR Setup ━━━"

if ! command -v curl >/dev/null 2>&1; then
    error "curl not found — required for Emby API calls"
    exit 1
fi

if ! command -v jq >/dev/null 2>&1; then
    error "jq not found — required for JSON parsing"
    notify "Emby report failed on $(hostname) — jq not installed" "Emby Report" "warning"
    exit 1
fi

require_var EMBY_URL
require_var EMBY_API_KEY

success "Config validated"
[[ "$DRY_RUN" == true ]] && warn "DRY RUN — API will be queried but no notification sent"

# -----------------------------------------------------------------------------------------------
# API HELPER
# -----------------------------------------------------------------------------------------------
emby_api() {
    local endpoint="$1"
    local response http_code body

    response=$(curl -sf \
        --max-time 15 \
        -H "X-Emby-Token: $EMBY_API_KEY" \
        -w "\n%{http_code}" \
        "${EMBY_URL}/${endpoint}" 2>/dev/null)

    http_code=$(echo "$response" | tail -1)
    body=$(echo "$response" | head -n -1)

    if [[ "$http_code" != "200" ]]; then
        error "Emby API returned HTTP $http_code for: $endpoint"
        return 1
    fi

    echo "$body"
}

# -----------------------------------------------------------------------------------------------
# ━━━ $ICON_EMBY Emby Session Report ━━━
# -----------------------------------------------------------------------------------------------
echo ""
echo "━━━ $ICON_EMBY Emby Session Report — $(date '+%Y-%m-%d %H:%M:%S') ━━━"
echo "$ICON_EMBY URL:         $EMBY_URL"
echo "$ICON_TIME  Period:      Last ${EMBY_REPORT_DAYS} days"
echo ""

START=$(date +%s)

# Test connectivity
info "Testing Emby API connectivity..."
SYSTEM_INFO=$(emby_api "System/Info" 2>/dev/null) || {
    error "Cannot connect to Emby at $EMBY_URL"
    notify "Emby report failed on $(hostname) — cannot connect to Emby" "Emby Report" "warning"
    exit 1
}

SERVER_NAME=$(echo "$SYSTEM_INFO" | jq -r '.ServerName // "Unknown"' 2>/dev/null)
SERVER_VERSION=$(echo "$SYSTEM_INFO" | jq -r '.Version // "Unknown"' 2>/dev/null)
success "Connected to: $SERVER_NAME (v$SERVER_VERSION)"
echo ""

# Calculate date range
REPORT_START=$(date -d "${EMBY_REPORT_DAYS} days ago" '+%Y-%m-%dT00:00:00')

# ── Active Sessions ──────────────────────────────────────────────────────────────────────────
echo "━━━ $ICON_EMBY Active Sessions ━━━"
SESSIONS=$(emby_api "Sessions" 2>/dev/null) || { warn "Could not fetch sessions"; SESSIONS="[]"; }

ACTIVE_COUNT=$(echo "$SESSIONS" | jq '[.[] | select(.NowPlayingItem != null)] | length' 2>/dev/null || echo 0)
TRANSCODE_COUNT=$(echo "$SESSIONS" | jq '[.[] | select(.NowPlayingItem != null) | select(.TranscodingInfo != null)] | length' 2>/dev/null || echo 0)
DIRECT_COUNT=$(( ACTIVE_COUNT - TRANSCODE_COUNT ))

echo "  $ICON_EMBY Active streams:    $ACTIVE_COUNT"
echo "  $ICON_EMBY Direct play:       $DIRECT_COUNT"
echo "  $ICON_EMBY Transcoding:       $TRANSCODE_COUNT"
echo ""

# ── Library Stats ────────────────────────────────────────────────────────────────────────────
echo "━━━ $ICON_EMBY Library ━━━"
ITEMS=$(emby_api "Items/Counts" 2>/dev/null) || { warn "Could not fetch library counts"; ITEMS="{}"; }

MOVIE_COUNT=$(echo "$ITEMS" | jq '.MovieCount // 0' 2>/dev/null || echo 0)
EPISODE_COUNT=$(echo "$ITEMS" | jq '.EpisodeCount // 0' 2>/dev/null || echo 0)
SONG_COUNT=$(echo "$ITEMS" | jq '.SongCount // 0' 2>/dev/null || echo 0)

echo "  $ICON_EMBY Movies:    $MOVIE_COUNT"
echo "  $ICON_EMBY Episodes:  $EPISODE_COUNT"
echo "  $ICON_EMBY Songs:     $SONG_COUNT"
echo ""

# ── Ramdisk Status (from state file) ────────────────────────────────────────────────────────
echo "━━━ $ICON_RAM Transcode Location ━━━"
if mountpoint -q "$RAMDISK_PATH" 2>/dev/null; then
    RAMDISK_USED_KB=$(df "$RAMDISK_PATH" --output=used | tail -1 | tr -d ' ')
    RAMDISK_USED_GB=$(awk "BEGIN {printf \"%.2f\", $RAMDISK_USED_KB / 1048576}")
    SYMLINK=$(readlink "$TRANSCODE_LINK" 2>/dev/null || echo "unknown")
    echo "  $ICON_RAM Ramdisk usage: ${RAMDISK_USED_GB}GB"
    echo "  $ICON_LINK Symlink target: $SYMLINK"
else
    echo "  $ICON_RAM Ramdisk: not mounted"
fi
echo ""

END=$(date +%s)

# -----------------------------------------------------------------------------------------------
# ━━━ $ICON_SUMMARY Summary ━━━
# -----------------------------------------------------------------------------------------------
echo "━━━━━ $ICON_SUMMARY EMBY REPORT SUMMARY ━━━━━"
echo "$ICON_EMBY  Server:   $SERVER_NAME (v$SERVER_VERSION)"
echo "$ICON_EMBY  Active:   $ACTIVE_COUNT streams ($DIRECT_COUNT direct / $TRANSCODE_COUNT transcode)"
echo "$ICON_EMBY  Library:  $MOVIE_COUNT movies  $EPISODE_COUNT episodes  $SONG_COUNT songs"
echo "$ICON_TIME  Duration: $(format_duration $((END - START)))"
echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"

if [[ "$DRY_RUN" == false ]]; then
    notify "Emby report on $(hostname) — $ACTIVE_COUNT active streams ($DIRECT_COUNT direct / $TRANSCODE_COUNT transcode) — Library: $MOVIE_COUNT movies $EPISODE_COUNT episodes" "Emby Report" "normal"
fi