import { query } from "./db";

// 真实模型名表达式：优先取 other 里的 upstream_model_name
const REAL_MODEL = `COALESCE(
  CASE WHEN other IS NOT NULL AND other != '' AND other::jsonb ? 'upstream_model_name'
       THEN other::jsonb->>'upstream_model_name' END,
  model_name)`;

// ── 数据时间边界 ────────────────────────────────────────────────

export async function getDateRange(): Promise<{ minDate: string; maxDate: string }> {
  const rows = await query(
    `SELECT
       ((MIN(to_timestamp(created_at)) AT TIME ZONE 'Asia/Shanghai')::date)::text as min_date,
       ((MAX(to_timestamp(created_at)) AT TIME ZONE 'Asia/Shanghai')::date)::text as max_date
     FROM logs WHERE type = 2`
  );
  return { minDate: rows[0]?.min_date ?? "", maxDate: rows[0]?.max_date ?? "" };
}

// 时间条件构建
function timeWhere(
  params: (string | number | boolean | null)[],
  startTs?: number,
  endTs?: number
): string {
  let where = "type = 2";
  if (startTs) {
    params.push(startTs);
    where += ` AND created_at >= $${params.length}`;
  }
  if (endTs) {
    params.push(endTs);
    where += ` AND created_at <= $${params.length}`;
  }
  return where;
}

// ── 总览 ──────────────────────────────────────────────────────

export interface OverviewData {
  total_calls: number;
  total_tokens: number;
  total_prompt: number;
  total_completion: number;
  total_quota: number;
  active_users: number;
  active_models: number;
  active_channels: number;
}

export async function getOverview(
  startTs?: number,
  endTs?: number
): Promise<OverviewData> {
  const params: (string | number | boolean | null)[] = [];
  const where = timeWhere(params, startTs, endTs);

  const rows = await query(
    `SELECT
       COUNT(*)::int as total_calls,
       COALESCE(SUM(prompt_tokens + completion_tokens), 0)::bigint as total_tokens,
       COALESCE(SUM(prompt_tokens), 0)::bigint as total_prompt,
       COALESCE(SUM(completion_tokens), 0)::bigint as total_completion,
       COALESCE(SUM(quota), 0)::bigint as total_quota,
       COUNT(DISTINCT user_id)::int as active_users,
       COUNT(DISTINCT ${REAL_MODEL})::int as active_models,
       COUNT(DISTINCT channel_id)::int as active_channels
     FROM logs WHERE ${where}`,
    params
  );
  const r = rows[0];
  return {
    total_calls: Number(r.total_calls),
    total_tokens: Number(r.total_tokens),
    total_prompt: Number(r.total_prompt),
    total_completion: Number(r.total_completion),
    total_quota: Number(r.total_quota),
    active_users: Number(r.active_users),
    active_models: Number(r.active_models),
    active_channels: Number(r.active_channels),
  };
}

// ── 趋势 ──────────────────────────────────────────────────────

export interface TrendPoint {
  date: string;
  calls: number;
  prompt_tokens: number;
  completion_tokens: number;
  total_tokens: number;
  quota: number;
}

export async function getTrends(
  granularity: "day" | "week" | "month" = "day",
  startTs?: number,
  endTs?: number
): Promise<TrendPoint[]> {
  const params: (string | number | boolean | null)[] = [];
  const where = timeWhere(params, startTs, endTs);

  const truncExpr =
    granularity === "day"
      ? `((to_timestamp(created_at) AT TIME ZONE 'Asia/Shanghai')::date)::text`
      : `(date_trunc('${granularity}', to_timestamp(created_at) AT TIME ZONE 'Asia/Shanghai')::date)::text`;

  const rows = await query(
    `SELECT
       ${truncExpr} as date,
       COUNT(*)::int as calls,
       COALESCE(SUM(prompt_tokens), 0)::bigint as prompt_tokens,
       COALESCE(SUM(completion_tokens), 0)::bigint as completion_tokens,
       COALESCE(SUM(quota), 0)::bigint as quota
     FROM logs WHERE ${where}
     GROUP BY date ORDER BY date`,
    params
  );

  return rows.map((r) => ({
    date: String(r.date).slice(0, 10),
    calls: Number(r.calls),
    prompt_tokens: Number(r.prompt_tokens),
    completion_tokens: Number(r.completion_tokens),
    total_tokens: Number(r.prompt_tokens) + Number(r.completion_tokens),
    quota: Number(r.quota),
  }));
}

// ── 排名 ──────────────────────────────────────────────────────

export interface RankingItem {
  rank: number;
  name: string;
  id?: number;
  calls: number;
  prompt_tokens: number;
  completion_tokens: number;
  total_tokens: number;
  quota: number;
  quota_usd: number;
}

// 用户显示名称映射
async function getDisplayNames(): Promise<Record<number, string>> {
  const rows = await query(
    "SELECT id, display_name FROM users WHERE display_name IS NOT NULL AND display_name != ''"
  );
  return Object.fromEntries(rows.map((r) => [r.id, r.display_name]));
}

// 渠道名称映射
async function getChannelNames(): Promise<Record<number, string>> {
  const rows = await query("SELECT id, name FROM channels");
  return Object.fromEntries(rows.map((r) => [r.id, r.name]));
}

export async function getUserRanking(
  startTs?: number,
  endTs?: number,
  limit = 50
): Promise<RankingItem[]> {
  const params: (string | number | boolean | null)[] = [];
  const where = timeWhere(params, startTs, endTs);
  params.push(limit);

  const displayNames = await getDisplayNames();

  const rows = await query(
    `SELECT user_id, username,
       COUNT(*)::int as calls,
       COALESCE(SUM(prompt_tokens), 0)::bigint as prompt,
       COALESCE(SUM(completion_tokens), 0)::bigint as completion,
       COALESCE(SUM(quota), 0)::bigint as quota
     FROM logs WHERE ${where}
     GROUP BY user_id, username
     ORDER BY COALESCE(SUM(prompt_tokens),0) + COALESCE(SUM(completion_tokens),0) DESC
     LIMIT $${params.length}`,
    params
  );

  return rows.map((r, i) => ({
    rank: i + 1,
    name: displayNames[r.user_id] || r.username,
    id: Number(r.user_id),
    calls: Number(r.calls),
    prompt_tokens: Number(r.prompt),
    completion_tokens: Number(r.completion),
    total_tokens: Number(r.prompt) + Number(r.completion),
    quota: Number(r.quota),
    quota_usd: Number(r.quota) / 500000,
  }));
}

export async function getModelRanking(
  startTs?: number,
  endTs?: number,
  limit = 50
): Promise<RankingItem[]> {
  const params: (string | number | boolean | null)[] = [];
  const where = timeWhere(params, startTs, endTs);
  params.push(limit);

  const rows = await query(
    `SELECT ${REAL_MODEL} as model,
       COUNT(*)::int as calls,
       COALESCE(SUM(prompt_tokens), 0)::bigint as prompt,
       COALESCE(SUM(completion_tokens), 0)::bigint as completion,
       COALESCE(SUM(quota), 0)::bigint as quota
     FROM logs WHERE ${where}
     GROUP BY model
     ORDER BY COALESCE(SUM(prompt_tokens),0) + COALESCE(SUM(completion_tokens),0) DESC
     LIMIT $${params.length}`,
    params
  );

  return rows.map((r, i) => ({
    rank: i + 1,
    name: r.model || "(unknown)",
    calls: Number(r.calls),
    prompt_tokens: Number(r.prompt),
    completion_tokens: Number(r.completion),
    total_tokens: Number(r.prompt) + Number(r.completion),
    quota: Number(r.quota),
    quota_usd: Number(r.quota) / 500000,
  }));
}

export async function getChannelRanking(
  startTs?: number,
  endTs?: number,
  limit = 50
): Promise<RankingItem[]> {
  const params: (string | number | boolean | null)[] = [];
  const where = timeWhere(params, startTs, endTs);
  params.push(limit);

  const channelNames = await getChannelNames();

  const rows = await query(
    `SELECT channel_id,
       COUNT(*)::int as calls,
       COALESCE(SUM(prompt_tokens), 0)::bigint as prompt,
       COALESCE(SUM(completion_tokens), 0)::bigint as completion,
       COALESCE(SUM(quota), 0)::bigint as quota
     FROM logs WHERE ${where}
     GROUP BY channel_id
     ORDER BY COALESCE(SUM(prompt_tokens),0) + COALESCE(SUM(completion_tokens),0) DESC
     LIMIT $${params.length}`,
    params
  );

  return rows.map((r, i) => ({
    rank: i + 1,
    name: channelNames[r.channel_id] || `已删除(${r.channel_id})`,
    id: Number(r.channel_id),
    calls: Number(r.calls),
    prompt_tokens: Number(r.prompt),
    completion_tokens: Number(r.completion),
    total_tokens: Number(r.prompt) + Number(r.completion),
    quota: Number(r.quota),
    quota_usd: Number(r.quota) / 500000,
  }));
}

// ── 下钻详情 ──────────────────────────────────────────────────

export interface DetailBreakdown {
  name: string;
  calls: number;
  total_tokens: number;
  quota: number;
}

export async function getUserDetail(
  username: string,
  startTs?: number,
  endTs?: number
) {
  const params: (string | number | boolean | null)[] = [];
  const where = timeWhere(params, startTs, endTs);
  params.push(username);

  // 用户总览
  const overview = await query(
    `SELECT COUNT(*)::int as calls,
       COALESCE(SUM(prompt_tokens),0)::bigint as prompt,
       COALESCE(SUM(completion_tokens),0)::bigint as completion,
       COALESCE(SUM(quota),0)::bigint as quota
     FROM logs WHERE ${where} AND username = $${params.length}`,
    params
  );

  // 用户的模型分布
  const params2: (string | number | boolean | null)[] = [];
  const where2 = timeWhere(params2, startTs, endTs);
  params2.push(username);

  const models = await query(
    `SELECT ${REAL_MODEL} as model,
       COUNT(*)::int as calls,
       COALESCE(SUM(prompt_tokens + completion_tokens),0)::bigint as tokens,
       COALESCE(SUM(quota),0)::bigint as quota
     FROM logs WHERE ${where2} AND username = $${params2.length}
     GROUP BY model
     ORDER BY tokens DESC LIMIT 20`,
    params2
  );

  const o = overview[0];
  return {
    calls: Number(o.calls),
    prompt_tokens: Number(o.prompt),
    completion_tokens: Number(o.completion),
    total_tokens: Number(o.prompt) + Number(o.completion),
    quota: Number(o.quota),
    models: models.map((m) => ({
      name: m.model,
      calls: Number(m.calls),
      total_tokens: Number(m.tokens),
      quota: Number(m.quota),
    })),
  };
}

export async function getModelDetail(
  model: string,
  startTs?: number,
  endTs?: number
) {
  const params: (string | number | boolean | null)[] = [];
  const where = timeWhere(params, startTs, endTs);
  params.push(model);

  const overview = await query(
    `SELECT COUNT(*)::int as calls,
       COALESCE(SUM(prompt_tokens),0)::bigint as prompt,
       COALESCE(SUM(completion_tokens),0)::bigint as completion,
       COALESCE(SUM(quota),0)::bigint as quota
     FROM logs WHERE ${where} AND ${REAL_MODEL} = $${params.length}`,
    params
  );

  const params2: (string | number | boolean | null)[] = [];
  const where2 = timeWhere(params2, startTs, endTs);
  params2.push(model);

  const displayNames = await getDisplayNames();
  const users = await query(
    `SELECT user_id, username,
       COUNT(*)::int as calls,
       COALESCE(SUM(prompt_tokens + completion_tokens),0)::bigint as tokens,
       COALESCE(SUM(quota),0)::bigint as quota
     FROM logs WHERE ${where2} AND ${REAL_MODEL} = $${params2.length}
     GROUP BY user_id, username
     ORDER BY tokens DESC LIMIT 20`,
    params2
  );

  const o = overview[0];
  return {
    calls: Number(o.calls),
    prompt_tokens: Number(o.prompt),
    completion_tokens: Number(o.completion),
    total_tokens: Number(o.prompt) + Number(o.completion),
    quota: Number(o.quota),
    users: users.map((u) => ({
      name: displayNames[u.user_id] || u.username,
      calls: Number(u.calls),
      total_tokens: Number(u.tokens),
      quota: Number(u.quota),
    })),
  };
}

export async function getChannelDetail(
  channelId: number,
  startTs?: number,
  endTs?: number
) {
  const params: (string | number | boolean | null)[] = [];
  const where = timeWhere(params, startTs, endTs);
  params.push(channelId);

  const channelNames = await getChannelNames();

  const overview = await query(
    `SELECT COUNT(*)::int as calls,
       COALESCE(SUM(prompt_tokens),0)::bigint as prompt,
       COALESCE(SUM(completion_tokens),0)::bigint as completion,
       COALESCE(SUM(quota),0)::bigint as quota
     FROM logs WHERE ${where} AND channel_id = $${params.length}`,
    params
  );

  const params2: (string | number | boolean | null)[] = [];
  const where2 = timeWhere(params2, startTs, endTs);
  params2.push(channelId);

  const models = await query(
    `SELECT ${REAL_MODEL} as model,
       COUNT(*)::int as calls,
       COALESCE(SUM(prompt_tokens + completion_tokens),0)::bigint as tokens,
       COALESCE(SUM(quota),0)::bigint as quota
     FROM logs WHERE ${where2} AND channel_id = $${params2.length}
     GROUP BY model
     ORDER BY tokens DESC LIMIT 20`,
    params2
  );

  const o = overview[0];
  return {
    channel_name: channelNames[channelId] || `已删除(${channelId})`,
    calls: Number(o.calls),
    prompt_tokens: Number(o.prompt),
    completion_tokens: Number(o.completion),
    total_tokens: Number(o.prompt) + Number(o.completion),
    quota: Number(o.quota),
    models: models.map((m) => ({
      name: m.model,
      calls: Number(m.calls),
      total_tokens: Number(m.tokens),
      quota: Number(m.quota),
    })),
  };
}

// ── 明细日志 ──────────────────────────────────────────────────

export interface LogEntry {
  id: number;
  created_at: string;
  username: string;
  display_name: string;
  real_model: string;
  request_model: string;
  channel_name: string;
  channel_id: number;
  prompt_tokens: number;
  completion_tokens: number;
  total_tokens: number;
  quota: number;
  quota_usd: number;
  use_time: number;
  is_stream: boolean;
  token_name: string;
}

export interface LogsResult {
  logs: LogEntry[];
  total: number;
  page: number;
  page_size: number;
}

export async function getLogs(options: {
  page?: number;
  pageSize?: number;
  startTs?: number;
  endTs?: number;
  username?: string;
  model?: string;
  channelId?: number;
  tokenName?: string;
}): Promise<LogsResult> {
  const { page = 1, pageSize = 100 } = options;
  const params: (string | number | boolean | null)[] = [];
  let where = timeWhere(params, options.startTs, options.endTs);

  if (options.username) {
    params.push(options.username);
    where += ` AND username = $${params.length}`;
  }
  if (options.model) {
    params.push(options.model);
    where += ` AND ${REAL_MODEL} = $${params.length}`;
  }
  if (options.channelId) {
    params.push(options.channelId);
    where += ` AND channel_id = $${params.length}`;
  }
  if (options.tokenName) {
    params.push(`%${options.tokenName}%`);
    where += ` AND token_name ILIKE $${params.length}`;
  }

  // Count
  const countRows = await query(
    `SELECT COUNT(*)::int as total FROM logs WHERE ${where}`,
    params
  );
  const total = Number(countRows[0].total);

  // Data
  const offset = (page - 1) * pageSize;
  const dataParams = [...params, pageSize, offset];

  const displayNames = await getDisplayNames();
  const channelNames = await getChannelNames();

  const rows = await query(
    `SELECT id, created_at, user_id, username, model_name,
       ${REAL_MODEL} as real_model,
       channel_id, prompt_tokens, completion_tokens, quota,
       use_time, is_stream, token_name
     FROM logs WHERE ${where}
     ORDER BY id DESC
     LIMIT $${dataParams.length - 1} OFFSET $${dataParams.length}`,
    dataParams
  );

  return {
    total,
    page,
    page_size: pageSize,
    logs: rows.map((r) => ({
      id: Number(r.id),
      created_at: new Date(Number(r.created_at) * 1000).toISOString(),
      username: r.username,
      display_name: displayNames[r.user_id] || r.username,
      real_model: r.real_model || r.model_name,
      request_model: r.model_name,
      channel_name: channelNames[r.channel_id] || `已删除(${r.channel_id})`,
      channel_id: Number(r.channel_id),
      prompt_tokens: Number(r.prompt_tokens),
      completion_tokens: Number(r.completion_tokens),
      total_tokens: Number(r.prompt_tokens) + Number(r.completion_tokens),
      quota: Number(r.quota),
      quota_usd: Number(r.quota) / 500000,
      use_time: Number(r.use_time),
      is_stream: Boolean(r.is_stream),
      token_name: r.token_name || "",
    })),
  };
}