#!/usr/bin/env bash
set -euo pipefail

TARGET_REPO="${1:-}"
WORKFLOW_FILE="${2:-}"
REF="${3:-}"
INPUTS_JSON="${4:-}"
GITEA_API_URL="${5:-}"
GITEA_TOKEN="${6:-}"
TIMEOUT_MINUTES="${7:-360}"
POLL_INTERVAL="${DISPATCH_POLL_INTERVAL:-10}"

[ -z "$TARGET_REPO" ] && echo "ERROR: target_repo argument is required" >&2 && exit 1
[ -z "$WORKFLOW_FILE" ] && echo "ERROR: workflow_file argument is required" >&2 && exit 1
[ -z "$REF" ] && echo "ERROR: ref argument is required" >&2 && exit 1
[ -z "$INPUTS_JSON" ] && echo "ERROR: inputs_json argument is required" >&2 && exit 1
[ -z "$GITEA_API_URL" ] && echo "ERROR: gitea_api_url argument is required" >&2 && exit 1
[ -z "$GITEA_TOKEN" ] && echo "ERROR: gitea_token argument is required" >&2 && exit 1

# Generate unique dispatch_id for display_title matching
# Can be overridden via DISPATCH_ID env var (for tests)
DISPATCH_ID="${DISPATCH_ID:-$(xxd -l 4 -p /dev/urandom 2>/dev/null || openssl rand -hex 4 2>/dev/null || date +%s | md5sum | head -c 8)}"
INPUTS_JSON=$(echo "$INPUTS_JSON" | jq --arg id "$DISPATCH_ID" '. + {dispatch_id: $id}')

DISPATCH_URL="$GITEA_API_URL/api/v1/repos/$TARGET_REPO/actions/workflows/$WORKFLOW_FILE/dispatches"
DISPATCH_BODY=$(jq -nc --arg ref "$REF" --argjson inputs "$INPUTS_JSON" '{ref: $ref, inputs: $inputs}')

DISPATCH_CODE=$(curl -s -o /dev/null -w "%{http_code}" \
  --connect-timeout 5 --max-time 10 \
  -X POST "$DISPATCH_URL" \
  -H "Authorization: token $GITEA_TOKEN" \
  -H "Content-Type: application/json" \
  -d "$DISPATCH_BODY")

if [ "$DISPATCH_CODE" != "201" ]; then
  echo "ERROR: Dispatch failed with HTTP $DISPATCH_CODE" >&2
  exit 1
fi

# Poll: find dispatched run by display_title matching
RUN_ID=""
TIMEOUT_SECONDS=$(awk "BEGIN {printf \"%.3f\", $TIMEOUT_MINUTES * 60}")
START_TIME=$(date +%s)

while [ -z "$RUN_ID" ]; do
  NOW=$(date +%s)
  ELAPSED=$((NOW - START_TIME))
  if awk -v e="$ELAPSED" -v t="$TIMEOUT_SECONDS" 'BEGIN { exit !(e >= t) }'; then
    echo "ERROR: Timeout after ${TIMEOUT_MINUTES} minutes — run not found" >&2
    exit 124
  fi

  RUNS_RESP=$(curl -s --connect-timeout 5 --max-time 10 \
    "$GITEA_API_URL/api/v1/repos/$TARGET_REPO/actions/runs?event=workflow_dispatch&limit=10" \
    -H "Authorization: token $GITEA_TOKEN")

  RUN_ID=$(echo "$RUNS_RESP" | jq -r --arg id "$DISPATCH_ID" \
    '[.workflow_runs[] | select(.display_title | contains($id))] | .[0].id // empty')

  [ -z "$RUN_ID" ] && sleep "$POLL_INTERVAL"
done

# Poll: wait for run to complete
while true; do
  NOW=$(date +%s)
  ELAPSED=$((NOW - START_TIME))
  if awk -v e="$ELAPSED" -v t="$TIMEOUT_SECONDS" 'BEGIN { exit !(e >= t) }'; then
    echo "ERROR: Timeout after ${TIMEOUT_MINUTES} minutes" >&2
    exit 124
  fi

  RUN_URL="$GITEA_API_URL/api/v1/repos/$TARGET_REPO/actions/runs/$RUN_ID"
  RUN_RESP=$(curl -s --connect-timeout 5 --max-time 10 \
    -H "Authorization: token $GITEA_TOKEN" "$RUN_URL")

  STATUS=$(echo "$RUN_RESP" | jq -r '.status // "running"')
  if [ "$STATUS" = "completed" ]; then
    CONCLUSION=$(echo "$RUN_RESP" | jq -r '.conclusion // "failure"')
    if [ "$CONCLUSION" = "success" ]; then
      exit 0
    fi
    echo "ERROR: Workflow completed with conclusion: $CONCLUSION" >&2
    exit 1
  fi

  sleep "$POLL_INTERVAL"
done