package com.wok.supportbot.service;

import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.stream.Collectors;

@Service
@Slf4j
public class CustomerServiceRoleService {

    @Autowired
    private JdbcTemplate jdbcTemplate;

    @Autowired
    private ObjectMapper objectMapper;

    public List<Map<String, Object>> listRoles() {
        return listRoles(false);
    }

    /**
     * @param includeDisabled true=包含已停用角色（管理页用）；false=仅启用角色（对话页用）
     */
    public List<Map<String, Object>> listRoles(boolean includeDisabled) {
        StringBuilder roleSql = new StringBuilder(
                "SELECT id::text AS id, role_key, name, description, prompt, enabled, allowed_mcp_tools "
                + "FROM customer_service_role WHERE is_delete = false ");
        if (!includeDisabled) {
            roleSql.append("AND enabled = true ");
        }
        roleSql.append("ORDER BY id ASC");
        List<Map<String, Object>> roles = jdbcTemplate.queryForList(roleSql.toString());

        // 查询角色-分类关联
        String categorySql = """
                SELECT rc.role_id::text AS role_id, rc.category_id::text AS category_id, c.name AS category_name
                FROM customer_service_role_category rc
                LEFT JOIN knowledge_category c ON c.id = rc.category_id AND c.is_delete = false
                WHERE rc.is_delete = false
                ORDER BY rc.role_id ASC, rc.id ASC
                """;
        List<Map<String, Object>> relations = jdbcTemplate.queryForList(categorySql);

        Map<String, List<String>> categoryIdsByRole = new LinkedHashMap<>();
        Map<String, List<Map<String, Object>>> categoriesByRole = new LinkedHashMap<>();
        for (Map<String, Object> relation : relations) {
            String roleId = String.valueOf(relation.get("role_id"));
            String categoryId = String.valueOf(relation.get("category_id"));
            categoryIdsByRole.computeIfAbsent(roleId, key -> new ArrayList<>()).add(categoryId);
            categoriesByRole.computeIfAbsent(roleId, key -> new ArrayList<>()).add(Map.of(
                    "id", categoryId,
                    "name", Objects.toString(relation.get("category_name"), "")
            ));
        }

        for (Map<String, Object> role : roles) {
            String roleId = String.valueOf(role.get("id"));
            role.put("categoryIds", categoryIdsByRole.getOrDefault(roleId, List.of()));
            role.put("categories", categoriesByRole.getOrDefault(roleId, List.of()));
        }
        return roles;
    }

    @Transactional(rollbackFor = Exception.class)
    public void updateRoleCategories(Long roleId, List<Long> categoryIds) {
        jdbcTemplate.update("UPDATE customer_service_role_category SET is_delete = true WHERE role_id = ?", roleId);

        if (categoryIds == null || categoryIds.isEmpty()) {
            return;
        }

        List<Long> normalizedIds = categoryIds.stream()
                .filter(Objects::nonNull)
                .filter(id -> id > 0)
                .distinct()
                .toList();
        for (Long categoryId : normalizedIds) {
            jdbcTemplate.update("""
                    INSERT INTO customer_service_role_category (role_id, category_id, is_delete)
                    VALUES (?, ?, false)
                    ON CONFLICT (role_id, category_id)
                    DO UPDATE SET is_delete = false
                    """, roleId, categoryId);
        }
    }

    /**
     * 新增角色。role_key 缺省时自动生成。
     */
    @Transactional(rollbackFor = Exception.class)
    public void createRole(String roleKey, String name, String description, String prompt, Boolean enabled) {
        if (name == null || name.trim().isEmpty()) {
            throw new IllegalArgumentException("角色名称不能为空");
        }
        String key = (roleKey == null || roleKey.trim().isEmpty())
                ? "role_" + System.currentTimeMillis()
                : roleKey.trim();
        jdbcTemplate.update("""
                    INSERT INTO customer_service_role (role_key, name, description, prompt, enabled)
                    VALUES (?, ?, ?, ?, ?)
                    """,
                key, name.trim(), description, prompt,
                enabled != null ? enabled : true);
    }

    /**
     * 编辑角色基本信息（不含知识库分类，分类走 {@link #updateRoleCategories}）。
     */
    @Transactional(rollbackFor = Exception.class)
    public void updateRole(Long roleId, String name, String description, String prompt, Boolean enabled) {
        if (roleId == null || roleId <= 0) {
            throw new IllegalArgumentException("角色ID无效");
        }
        if (name == null || name.trim().isEmpty()) {
            throw new IllegalArgumentException("角色名称不能为空");
        }
        jdbcTemplate.update("""
                UPDATE customer_service_role
                SET name = ?, description = ?, prompt = ?, enabled = ?, update_time = CURRENT_TIMESTAMP
                WHERE id = ? AND is_delete = false
                """,
                name.trim(), description, prompt,
                enabled != null ? enabled : true,
                roleId);
    }

    /**
     * 逻辑删除角色，并连带逻辑删除其知识库分类关联。
     */
    @Transactional(rollbackFor = Exception.class)
    public void deleteRole(Long roleId) {
        if (roleId == null || roleId <= 0) {
            return;
        }
        jdbcTemplate.update("UPDATE customer_service_role SET is_delete = true, update_time = CURRENT_TIMESTAMP WHERE id = ?", roleId);
        jdbcTemplate.update("UPDATE customer_service_role_category SET is_delete = true WHERE role_id = ?", roleId);
    }

    /**
     * 更新角色的 MCP 工具权限。
     *
     * @param roleId          角色ID
     * @param allowedMcpTools 允许的 MCP 工具名列表；["*"]=全部允许，空/null=不允许任何工具
     */
    @Transactional(rollbackFor = Exception.class)
    public void updateRoleMcpTools(Long roleId, List<String> allowedMcpTools) {
        if (roleId == null || roleId <= 0) {
            throw new IllegalArgumentException("角色ID无效");
        }
        String json;
        try {
            json = objectMapper.writeValueAsString(allowedMcpTools != null ? allowedMcpTools : List.of());
        } catch (Exception e) {
            json = "[]";
        }
        jdbcTemplate.update(
                "UPDATE customer_service_role SET allowed_mcp_tools = ?::jsonb, update_time = CURRENT_TIMESTAMP WHERE id = ? AND is_delete = false",
                json, roleId);
    }

    /**
     * 服务端解析角色的知识库范围与人设。
     * 用于对话时强制约束：角色只能检索其绑定分类下的内容，由后端决定，客户端无法越权跨域。
     *
     * @param roleId 角色ID
     * @return 角色范围；角色不存在或被禁用时返回 {@link RoleScope#empty()}
     */
    public RoleScope getRoleScope(Long roleId) {
        if (roleId == null || roleId <= 0) {
            return RoleScope.empty();
        }
        List<Map<String, Object>> rows = jdbcTemplate.queryForList(
                "SELECT name, prompt, allowed_mcp_tools FROM customer_service_role WHERE id = ? AND is_delete = false AND enabled = true",
                roleId);
        if (rows.isEmpty()) {
            return RoleScope.empty();
        }
        String name = Objects.toString(rows.get(0).get("name"), "");
        String prompt = Objects.toString(rows.get(0).get("prompt"), "");
        List<Long> categoryIds = jdbcTemplate.queryForList(
                "SELECT category_id FROM customer_service_role_category WHERE role_id = ? AND is_delete = false",
                Long.class, roleId);
        // 解析 allowed_mcp_tools JSONB 字段
        List<String> allowedMcpTools = parseAllowedMcpTools(rows.get(0).get("allowed_mcp_tools"));
        return new RoleScope(true, name, prompt, categoryIds, allowedMcpTools);
    }

    /**
     * 解析 allowed_mcp_tools JSONB 字段为 List<String>
     * 兼容 PostgreSQL JSONB、Java List、String 等多种输入类型
     */
    private List<String> parseAllowedMcpTools(Object raw) {
        if (raw == null) {
            return List.of();
        }
        try {
            if (raw instanceof List<?> list) {
                return list.stream().map(Objects::toString).toList();
            }
            String json = raw.toString().trim();
            if (json.isEmpty() || "[]".equals(json) || "null".equals(json)) {
                return List.of();
            }
            return objectMapper.readValue(json, new TypeReference<>() {});
        } catch (Exception e) {
            log.warn("解析 allowed_mcp_tools 失败: {}", raw, e);
            return List.of();
        }
    }

    /**
     * 精简角色信息（Token 换取接口用）
     */
    public record RoleBrief(Long id, String roleKey, String name) {}

    /**
     * 查询所有启用的客服角色（精简字段）
     *
     * @return 精简角色信息列表
     */
    public List<RoleBrief> listEnabledRolesBrief() {
        String sql = "SELECT id, role_key, name FROM customer_service_role " +
                     "WHERE enabled = true AND is_delete = false ORDER BY id";
        return jdbcTemplate.query(sql, (rs, i) -> new RoleBrief(
                rs.getLong("id"),
                rs.getString("role_key"),
                rs.getString("name")
        ));
    }

    /**
     * 根据 ID 列表查询启用的客服角色（精简字段，用于 API Key 角色绑定的 Token 换取）
     *
     * @param roleIds 角色 ID 列表
     * @return 精简角色信息列表
     */
    public List<RoleBrief> listRolesByIds(List<Long> roleIds) {
        if (roleIds == null || roleIds.isEmpty()) {
            return List.of();
        }
        String placeholders = roleIds.stream().map(id -> "?").collect(Collectors.joining(","));
        String sql = "SELECT id, role_key, name FROM customer_service_role " +
                     "WHERE enabled = true AND is_delete = false AND id IN (" + placeholders + ") ORDER BY id";
        return jdbcTemplate.query(sql, (rs, i) -> new RoleBrief(
                rs.getLong("id"),
                rs.getString("role_key"),
                rs.getString("name")
        ), roleIds.toArray());
    }

    /**
     * 角色范围：是否命中角色、角色人设、可检索的知识库分类、MCP 工具权限。
     */
    public record RoleScope(boolean present, String name, String prompt, List<Long> categoryIds, List<String> allowedMcpTools) {

        public static RoleScope empty() {
            return new RoleScope(false, "", "", List.of(), List.of());
        }

        public boolean hasRole() {
            return present;
        }

        /** 是否允许使用 MCP 工具（非空即允许） */
        public boolean isMcpToolsAllowed() {
            return allowedMcpTools != null && !allowedMcpTools.isEmpty();
        }

        /** 是否允许使用所有 MCP 工具（["*"] 表示全部允许） */
        public boolean isAllMcpToolsAllowed() {
            return allowedMcpTools != null && allowedMcpTools.contains("*");
        }

        /**
         * 组合角色系统提示词：当前客服角色 + 人设；都为空时返回 null（退回基础提示词）。
         */
        public String systemPrompt() {
            if (!present) {
                return null;
            }
            String trimmedName = name == null ? "" : name.trim();
            String trimmedPrompt = prompt == null ? "" : prompt.trim();
            if (trimmedName.isEmpty() && trimmedPrompt.isEmpty()) {
                return null;
            }
            StringBuilder sb = new StringBuilder();
//            if (!trimmedName.isEmpty()) {
//                sb.append("当前客服角色：").append(trimmedName).append("。");
//            }
            if (!trimmedPrompt.isEmpty()) {
                sb.append(trimmedPrompt);
            }
            return sb.toString();
        }
    }
}