import type { TaskReportRow } from "./mvp-db";

const CSV_HEADERS = [
  "任务ID",
  "任务名称",
  "任务类型",
  "品牌",
  "平台",
  "所属项目",
  "任务状态",
  "计划数量",
  "领取数",
  "发布数",
  "完成数",
  "完成率",
  "截止日期",
  "创建时间",
  "曝光量合计",
  "阅读量合计",
  "D2点赞",
  "D2评论",
  "D2收藏",
  "D5点赞",
  "D5评论",
  "D5收藏",
  "D7点赞",
  "D7评论",
  "D7收藏",
  "最新点赞",
  "最新评论",
  "最新收藏",
  "最新转发",
  "关联任务",
  "截图提交数",
];

function taskTypeLabel(value: string) {
  return value === "screenshot_collect" ? "截图采集" : "内容发布";
}

function taskStatusLabel(value: string) {
  return value === "active" ? "进行中" : value === "completed" ? "已完结" : value;
}

function completionRate(row: TaskReportRow) {
  if (!row.claimed_count) return "";
  return `${Math.round((row.completed_count / row.claimed_count) * 100)}%`;
}

function csvCell(value: string | number | null | undefined) {
  const text = value === null || value === undefined ? "" : String(value);
  if (/[",\r\n]/.test(text)) return `"${text.replaceAll('"', '""')}"`;
  return text;
}

export function buildTaskReportCsv(rows: TaskReportRow[]) {
  const lines = [CSV_HEADERS.join(",")];
  for (const row of rows) {
    lines.push(
      [
        row.id,
        row.name,
        taskTypeLabel(row.task_type),
        row.brand,
        row.platform,
        row.project_name ?? "",
        taskStatusLabel(row.status),
        row.quantity,
        row.claimed_count,
        row.published_count,
        row.completed_count,
        completionRate(row),
        row.due_at,
        row.created_at,
        row.exposure_total,
        row.views_total,
        row.d2_likes,
        row.d2_comments,
        row.d2_collects,
        row.d5_likes,
        row.d5_comments,
        row.d5_collects,
        row.d7_likes,
        row.d7_comments,
        row.d7_collects,
        row.latest_likes,
        row.latest_comments,
        row.latest_collects,
        row.latest_shares,
        row.related_task_name ?? row.reverse_related_task_name ?? "",
        row.task_type === "screenshot_collect" ? row.submitted_count : "",
      ]
        .map(csvCell)
        .join(","),
    );
  }
  return `\uFEFF${lines.join("\r\n")}`;
}