import type { DatabaseClient } from "./database";
import {
  createAppChat,
  getAppChat,
  hasAppCredentials,
  sanitizeChatid,
  updateAppChat,
  type WecomConfig,
} from "./wecom-client";

type FetchLike = typeof fetch;

export type ProjectRow = {
  id: string;
  name: string;
  brand: string;
  main_group_member_ids: string;
  owner_userid: string;
  main_chat_id: string;
  status: string;
  note: string;
  created_at: string;
};

export type ProjectSummary = {
  id: string;
  name: string;
  brand: string;
  status: string;
  note: string;
  createdAt: string;
  mainGroupMemberIds: string[];
  ownerUserid: string;
  mainChatId: string;
  taskCount: number;
};

export type ProjectTaskRow = {
  id: string;
  name: string;
  brand: string;
  quantity: number;
  claimed_quantity: number;
  due_at: string;
  status: string;
  task_type: string;
  platform: string;
  content_format: string;
  share_token: string | null;
  owner_userid: string;
  task_chat_id: string;
  recovery_enabled: number;
  recovery_due_at: string;
  dist_total: number;
  recovery_submitted: number;
};

export type ProjectMainChat = {
  chatId: string;
  members: string[];
};

export type ProjectDetail = {
  project: ProjectSummary;
  tasks: ProjectTaskRow[];
  mainChat: ProjectMainChat;
};

export type MainChatEnsureReason =
  | "no_project"
  | "no_credentials"
  | "not_enough_members";

export type MainChatEnsureResult = {
  chatId: string | null;
  members: string[];
  reason?: MainChatEnsureReason;
  warning?: string;
};

export type GroupOwnerPartnerRow = {
  id: string;
  name: string;
  wecom_userid: string;
  partner_type: string;
};

function text(value: unknown) {
  return String(value ?? "").trim();
}

export class ProjectError extends Error {
  status: number;
  constructor(message: string, status = 400) {
    super(message);
    this.status = status;
  }
}

export function parseMemberIds(value: unknown): string[] {
  const raw = Array.isArray(value)
    ? value.map((item) => text(item))
    : text(value).split(/[\s,;，；]+/);
  const seen = new Set<string>();
  for (const item of raw) {
    if (item) seen.add(item);
  }
  return [...seen];
}

function parseJsonArray(value: string): string[] {
  try {
    const parsed = JSON.parse(value);
    return Array.isArray(parsed) ? parsed.map((item) => String(item)) : [];
  } catch {
    return [];
  }
}

export function effectiveProjectMembers(
  memberIdsValue: unknown,
  ownerUserid: unknown,
): string[] {
  const raw =
    typeof memberIdsValue === "string" && memberIdsValue.trim().startsWith("[")
      ? parseJsonArray(memberIdsValue)
      : memberIdsValue;
  const members = parseMemberIds(raw);
  const owner = text(ownerUserid);
  if (owner && !members.includes(owner)) members.push(owner);
  return members;
}

export function projectMainChatId(projectId: string) {
  return `pgc${sanitizeChatid(text(projectId))}`;
}

export async function ensureProjectMainChat(
  db: DatabaseClient,
  projectId: string,
  config: WecomConfig,
  fetchImpl: FetchLike = fetch,
): Promise<MainChatEnsureResult> {
  const id = text(projectId);
  if (!id) return { chatId: null, members: [], reason: "no_project" };
  const project = await db
    .prepare(
      "SELECT id, name, main_group_member_ids, owner_userid, main_chat_id FROM projects WHERE id = ?",
    )
    .bind(id)
    .first<ProjectRow>();
  if (!project) return { chatId: null, members: [], reason: "no_project" };

  const members = effectiveProjectMembers(
    project.main_group_member_ids,
    project.owner_userid,
  );
  const existingChatId = text(project.main_chat_id);
  if (!hasAppCredentials(config)) {
    return {
      chatId: existingChatId || null,
      members,
      reason: existingChatId ? undefined : "no_credentials",
    };
  }

  if (existingChatId) {
    try {
      const info = await getAppChat(config, existingChatId, fetchImpl);
      if (info) {
        const inGroup = new Set(info.userlist);
        const addUserList = members.filter((userid) => !inGroup.has(userid));
        const delUserList = info.userlist.filter(
          (userid) => !members.includes(userid),
        );
        if (addUserList.length > 0 || delUserList.length > 0) {
          await updateAppChat(
            config,
            { chatid: existingChatId, addUserList, delUserList },
            fetchImpl,
          );
        }
      } else {
        // appchat/get 要求应用可见范围为根部门，查不到成员时降级为只增同步（重复添加按成功处理）
        await updateAppChat(
          config,
          { chatid: existingChatId, addUserList: members },
          fetchImpl,
        );
      }
      return { chatId: existingChatId, members };
    } catch (error) {
      return {
        chatId: existingChatId,
        members,
        warning: `项目总群成员同步失败：${error instanceof Error ? error.message : String(error)}`,
      };
    }
  }

  if (members.length < 3) {
    return { chatId: null, members, reason: "not_enough_members" };
  }

  const candidate = projectMainChatId(id);
  try {
    const probed = await getAppChat(config, candidate, fetchImpl);
    let chatId = candidate;
    if (!probed) {
      const created = await createAppChat(
        config,
        { name: `【总群】${project.name}`, userlist: members, chatid: candidate },
        fetchImpl,
      );
      chatId = created.chatid || candidate;
    }
    await db
      .prepare("UPDATE projects SET main_chat_id = ? WHERE id = ?")
      .bind(chatId, id)
      .run();
    return { chatId, members };
  } catch (error) {
    return {
      chatId: null,
      members,
      warning: `项目总群创建失败：${error instanceof Error ? error.message : String(error)}`,
    };
  }
}

export async function listProjects(
  db: DatabaseClient,
  ownerUserid?: string,
): Promise<ProjectSummary[]> {
  // undefined=全量；""=已登录未绑定企微（空范围，不能绑定 '' 否则漏出无主项目）
  if (ownerUserid !== undefined && String(ownerUserid).trim() === "") {
    return [];
  }
  const ownerFilter = String(ownerUserid ?? "").trim();
  const result = await (ownerFilter
    ? db
        .prepare(
          `SELECT p.id, p.name, p.brand, p.main_group_member_ids, p.owner_userid, p.main_chat_id, p.status, p.note, p.created_at,
                  (SELECT COUNT(*) FROM tasks t WHERE t.project_id = p.id) AS task_count
           FROM projects p
           WHERE p.owner_userid = ?
           ORDER BY p.created_at DESC`,
        )
        .bind(ownerFilter)
    : db
        .prepare(
          `SELECT p.id, p.name, p.brand, p.main_group_member_ids, p.owner_userid, p.main_chat_id, p.status, p.note, p.created_at,
                  (SELECT COUNT(*) FROM tasks t WHERE t.project_id = p.id) AS task_count
           FROM projects p
           ORDER BY p.created_at DESC`,
        )
  ).all<ProjectRow & { task_count: number }>();
  return result.results.map((row) => ({
    id: row.id,
    name: row.name,
    brand: row.brand,
    status: row.status,
    note: row.note,
    createdAt: row.created_at,
    mainGroupMemberIds: parseJsonArray(row.main_group_member_ids),
    ownerUserid: row.owner_userid ?? "",
    mainChatId: row.main_chat_id ?? "",
    taskCount: Number(row.task_count),
  }));
}

export async function getProjectDetail(
  db: DatabaseClient,
  projectId: string,
): Promise<ProjectDetail> {
  const id = text(projectId);
  const project = await db
    .prepare(
      `SELECT id, name, brand, main_group_member_ids, owner_userid, main_chat_id, status, note, created_at
       FROM projects WHERE id = ?`,
    )
    .bind(id)
    .first<ProjectRow>();
  if (!project) throw new ProjectError("项目不存在", 404);

  const tasks = await db
    .prepare(
      `SELECT id, name, brand, quantity, claimed_quantity, due_at, status,
              task_type, platform, content_format, share_token, owner_userid, task_chat_id,
              recovery_enabled, recovery_due_at,
              (SELECT COUNT(*) FROM distributions d WHERE d.task_id = t.id) AS dist_total,
              (SELECT COUNT(*) FROM distributions d WHERE d.task_id = t.id AND d.result_submitted_at IS NOT NULL) AS recovery_submitted
       FROM tasks t WHERE t.project_id = ?
       ORDER BY t.created_at DESC`,
    )
    .bind(id)
    .all<ProjectTaskRow>();

  return {
    project: {
      id: project.id,
      name: project.name,
      brand: project.brand,
      status: project.status,
      note: project.note,
      createdAt: project.created_at,
      mainGroupMemberIds: parseJsonArray(project.main_group_member_ids),
      ownerUserid: project.owner_userid ?? "",
      mainChatId: project.main_chat_id ?? "",
      taskCount: tasks.results.length,
    },
    tasks: tasks.results,
    mainChat: {
      chatId: project.main_chat_id ?? "",
      members: effectiveProjectMembers(
        project.main_group_member_ids,
        project.owner_userid,
      ),
    },
  };
}

export type SaveProjectInput = {
  id?: unknown;
  name?: unknown;
  brand?: unknown;
  mainGroupMemberIds?: unknown;
  ownerUserid?: unknown;
  note?: unknown;
};

export async function saveProject(
  db: DatabaseClient,
  input: SaveProjectInput,
  config?: WecomConfig,
  fetchImpl: FetchLike = fetch,
): Promise<{ project: ProjectSummary; mainChat: MainChatEnsureResult }> {
  const id = text(input.id);
  const name = text(input.name);
  const brand = text(input.brand);
  const note = text(input.note ?? "");
  const ownerUserid = text(input.ownerUserid).slice(0, 64);
  const memberIds = effectiveProjectMembers(input.mainGroupMemberIds, ownerUserid);
  if (!name) throw new ProjectError("请填写项目名称");

  const now = new Date().toISOString();
  let projectId = id;
  if (id) {
    const result = await db
      .prepare(
        `UPDATE projects
         SET name = ?, brand = ?, main_group_member_ids = ?, owner_userid = ?, note = ?
         WHERE id = ?`,
      )
      .bind(name, brand, JSON.stringify(memberIds), ownerUserid, note, id)
      .run();
    if (result.meta.changes === 0) throw new ProjectError("项目不存在", 404);
  } else {
    projectId = `proj-${crypto.randomUUID().slice(0, 12)}`;
    await db
      .prepare(
        `INSERT INTO projects
          (id, name, brand, main_group_member_ids, owner_userid, status, note, created_at)
         VALUES (?, ?, ?, ?, ?, 'active', ?, ?)`,
      )
      .bind(
        projectId,
        name,
        brand,
        JSON.stringify(memberIds),
        ownerUserid,
        note,
        now,
      )
      .run();
  }
  const mainChat = config
    ? await ensureProjectMainChat(db, projectId, config, fetchImpl)
    : {
        chatId: null,
        members: memberIds,
        reason: "no_credentials" as MainChatEnsureReason,
      };
  const detail = await getProjectDetail(db, projectId);
  return { project: detail.project, mainChat };
}

export async function deleteProject(
  db: DatabaseClient,
  projectId: string,
): Promise<void> {
  const id = text(projectId);
  if (!id) throw new ProjectError("缺少项目 ID");
  const result = await db
    .prepare("DELETE FROM projects WHERE id = ?")
    .bind(id)
    .run();
  if (result.meta.changes === 0) throw new ProjectError("项目不存在", 404);
  await db
    .prepare("UPDATE tasks SET project_id = '' WHERE project_id = ?")
    .bind(id)
    .run();
}

export async function listGroupOwnerPartners(
  db: DatabaseClient,
): Promise<GroupOwnerPartnerRow[]> {
  const result = await db
    .prepare(
      `SELECT id, name, wecom_userid, partner_type
       FROM partners
       WHERE partner_type = 'group_owner'
       ORDER BY created_at DESC`,
    )
    .all<GroupOwnerPartnerRow>();
  return result.results;
}

export type SavePartnerInput = {
  id?: unknown;
  name?: unknown;
  wecomUserid?: unknown;
};

export async function saveGroupOwnerPartner(
  db: DatabaseClient,
  input: SavePartnerInput,
): Promise<GroupOwnerPartnerRow> {
  const id = text(input.id);
  const name = text(input.name);
  const wecomUserid = text(input.wecomUserid);
  if (!name) throw new ProjectError("请填写合作方名称");
  if (!wecomUserid) throw new ProjectError("请填写企业微信 userid");

  let partnerId = id;
  if (id) {
    const result = await db
      .prepare(
        `UPDATE partners
         SET name = ?, wecom_userid = ?, partner_type = 'group_owner'
         WHERE id = ?`,
      )
      .bind(name, wecomUserid, id)
      .run();
    if (result.meta.changes === 0) throw new ProjectError("合作方不存在", 404);
  } else {
    partnerId = `partner-go-${crypto.randomUUID().slice(0, 12)}`;
    await db
      .prepare(
        `INSERT INTO partners
          (id, name, wecom_name, owner, claimed_total, completed_total,
           partner_type, wecom_userid, created_at)
         VALUES (?, ?, '', '运营组', 0, 0, 'group_owner', ?, ?)`,
      )
      .bind(partnerId, name, wecomUserid, new Date().toISOString())
      .run();
  }
  const row = await db
    .prepare(
      "SELECT id, name, wecom_userid, partner_type FROM partners WHERE id = ?",
    )
    .bind(partnerId)
    .first<GroupOwnerPartnerRow>();
  if (!row) throw new ProjectError("合作方保存失败", 500);
  return row;
}

export async function findOrCreateGroupOwnerPartner(
  db: DatabaseClient,
  wecomUserid: string,
): Promise<GroupOwnerPartnerRow> {
  const userid = text(wecomUserid).slice(0, 128);
  if (!userid) throw new ProjectError("缺少企业微信 userid");
  const existing = await db
    .prepare(
      `SELECT id, name, wecom_userid, partner_type
       FROM partners
       WHERE partner_type = 'group_owner' AND wecom_userid = ?
       ORDER BY created_at
       LIMIT 1`,
    )
    .bind(userid)
    .first<GroupOwnerPartnerRow>();
  if (existing) return existing;
  return saveGroupOwnerPartner(db, { name: userid, wecomUserid: userid });
}