#!/bin/bash

# Gemini API Reliability Harvester
# -------------------------------
# This script gathers data about 500 API errors encountered during evaluation runs
# (eval.yml) from GitHub Actions. It is used to analyze developer friction caused 
# by transient API failures.
#
# Usage:
#   ./scripts/harvest_api_reliability.sh [SINCE] [LIMIT] [BRANCH]
#
# Examples:
#   ./scripts/harvest_api_reliability.sh           # Last 7 days, all branches
#   ./scripts/harvest_api_reliability.sh 14d 500   # Last 14 days, limit 500
#   ./scripts/harvest_api_reliability.sh 2026-03-01 100 my-branch # Specific date and branch
#
# Prerequisites:
#   - GitHub CLI (gh) installed and authenticated (`gh auth login`)
#   - jq installed

# Arguments & Defaults
if [[ -n "${1}" && "${1}" =~ ^[0-9]{4}-[0-9]{2}-[0-9]{2}$ ]]; then
    SINCE="${1}"
elif [[ -n "${1}" && "${1}" =~ ^([0-9]+)d$ ]]; then
    DAYS="${BASH_REMATCH[1]}"
    os_type="$(uname || true)"
    if [[ "${os_type}" == "darwin"* ]]; then
        SINCE=$(date -u -v-"${DAYS}"d +%Y-%m-%d)
    else
        SINCE=$(date -u -d "${DAYS} days ago" +%Y-%m-%d)
    fi
else
    # Default to 7 days ago in YYYY-MM-DD format (UTC)
    os_type="$(uname || true)"
    if [[ "${os_type}" == "darwin"* ]]; then
        SINCE=$(date -u -v-7d +%Y-%m-%d)
    else
        SINCE=$(date -u -d "7 days ago" +%Y-%m-%d)
    fi
fi

LIMIT=${2:-300}
BRANCH=${3:-""}
WORKFLOWS=("Testing: E2E (Chained)" "Evals: Nightly")
DEST_DIR="$(mktemp -d -t gemini-reliability-XXXXXX)"
MERGED_FILE="api-reliability-summary.jsonl"

# Ensure cleanup on exit
trap 'rm -rf "${DEST_DIR}"' EXIT

if ! command -v gh &> /dev/null; then
    echo "❌ Error: GitHub CLI (gh) is not installed."
    exit 1
fi

if ! command -v jq &> /dev/null; then
    echo "❌ Error: jq is not installed."
    exit 1
fi

# Clean start
rm -f "${MERGED_FILE}"

# gh run list --created expects a date (YYYY-MM-DD) or a range
CREATED_QUERY=">=${SINCE}"

for WORKFLOW in "${WORKFLOWS[@]}"; do
    echo "🔍 Fetching runs for '${WORKFLOW}' created since ${SINCE} (max ${LIMIT} runs, branch: ${BRANCH:-all})..."

    # Construct arguments for gh run list
    GH_ARGS=("--workflow" "${WORKFLOW}" "--created" "${CREATED_QUERY}" "--limit" "${LIMIT}" "--json" "databaseId" "--jq" ".[].databaseId")
    if [[ -n "${BRANCH}" ]]; then
        GH_ARGS+=("--branch" "${BRANCH}")
    fi

    RUN_IDS=$(gh run list "${GH_ARGS[@]}")
    exit_code=$?

    if [[ "${exit_code}" -ne 0 ]]; then
        echo "❌ Failed to fetch runs for '${WORKFLOW}' (exit code: ${exit_code}). Please check 'gh auth status' and permissions." >&2
        continue
    fi

    if [[ -z "${RUN_IDS}" ]]; then
        echo "📭 No runs found for workflow '${WORKFLOW}' since ${SINCE}."
        continue
    fi

    for ID in ${RUN_IDS}; do
        # Download artifacts named 'eval-logs-*'
        # Silencing output because many older runs won't have artifacts
        gh run download "${ID}" -p "eval-logs-*" -D "${DEST_DIR}/${ID}" &>/dev/null || continue
        
        # Append to master log
        # Use find to locate api-reliability.jsonl in any subdirectory of $DEST_DIR/$ID
        find "${DEST_DIR}/${ID}" -type f -name "api-reliability.jsonl" -exec cat {} + >> "${MERGED_FILE}" 2>/dev/null
    done
done

if [[ ! -f "${MERGED_FILE}" ]]; then
    echo "📭 No reliability data found in the retrieved logs."
    exit 0
fi

echo -e "\n✅ Harvest Complete! Data merged into: ${MERGED_FILE}"
echo "------------------------------------------------"
echo "📊 Gemini API Reliability Summary (Since ${SINCE})"
echo "------------------------------------------------"

# shellcheck disable=SC2312
cat "${MERGED_FILE}" | jq -s '
  group_by(.model) | map({
    model: .[0].model,
    "500s": (map(select(.errorCode == "500")) | length),
    "503s": (map(select(.errorCode == "503")) | length),
    retries: (map(select(.status == "RETRY")) | length),
    skips: (map(select(.status == "SKIP")) | length)
  })'

# shellcheck disable=SC2312
echo -e "\n💡 Total events captured: $(wc -l < "${MERGED_FILE}")"