package com.kaidi.oa.web;

import com.kaidi.oa.common.ApiException;
import com.kaidi.oa.common.ApiResp;
import com.kaidi.oa.common.NotFoundException;
import com.kaidi.oa.domain.ContractTemplate;
import com.kaidi.oa.repository.ContractTemplateRepository;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import java.time.Instant;
import java.util.List;

/**
 * Contract template library in the unified contract center (business chain 3).
 * contractType is one of 经营合同 / 采购合同 / 成本合同 / 销售合同 / 法务合同;
 * applicableSubject is one of 总公司 / 分公司 / 集团小公司 / 不限;
 * status is one of 启用 / 停用.
 */
@RestController
@RequestMapping("/api/oa/contract-templates")
public class ContractTemplateController {

    private final ContractTemplateRepository templateRepo;

    public ContractTemplateController(ContractTemplateRepository templateRepo) {
        this.templateRepo = templateRepo;
    }

    @GetMapping
    public ApiResp<List<ContractTemplate>> list(@RequestParam(required = false) String contractType,
                                                @RequestParam(required = false) String status) {
        List<ContractTemplate> list;
        if (contractType != null && !contractType.isBlank()) {
            list = templateRepo.findByContractType(contractType);
        } else if (status != null && !status.isBlank()) {
            list = templateRepo.findByStatus(status);
        } else {
            list = templateRepo.findAll();
        }
        return ApiResp.ok(list);
    }

    @GetMapping("/{id}")
    public ApiResp<ContractTemplate> get(@PathVariable Long id) {
        return ApiResp.ok(templateRepo.findById(id)
                .orElseThrow(() -> new NotFoundException("contract template not found: " + id)));
    }

    /**
     * 取模板正文（供「模板起草」页消费 bodyTemplate，并附必备条款与占位符列表）。
     * 之前 bodyTemplate 字段已存却无页面消费（LOGIC_GAP），此端点把模板正文显式端出，
     * 让起草页能"选模板 → 拉正文 → 填占位符 → 生成草稿"。占位符抽取 {xxx} 形式。
     */
    @GetMapping("/{id}/body")
    public ApiResp<TemplateBody> body(@PathVariable Long id) {
        ContractTemplate t = templateRepo.findById(id)
                .orElseThrow(() -> new NotFoundException("contract template not found: " + id));
        List<String> placeholders = extractPlaceholders(t.getBodyTemplate());
        return ApiResp.ok(new TemplateBody(t.getId(), t.getName(), t.getContractType(),
                t.getApplicableSubject(), t.getVersion(), t.getBodyTemplate(),
                t.getRequiredClauses(), placeholders));
    }

    public record TemplateBody(Long id, String name, String contractType, String applicableSubject,
                               String version, String bodyTemplate, String requiredClauses,
                               List<String> placeholders) {
    }

    /** 抽取 {占位符} 形式的占位符名（去重保序），供起草页生成填充表单。 */
    private static List<String> extractPlaceholders(String body) {
        List<String> out = new java.util.ArrayList<>();
        if (body == null || body.isBlank()) {
            return out;
        }
        java.util.regex.Matcher m = java.util.regex.Pattern.compile("\\{([^{}]{1,40})\\}").matcher(body);
        while (m.find()) {
            String name = m.group(1).trim();
            if (!name.isEmpty() && !out.contains(name)) {
                out.add(name);
            }
        }
        return out;
    }

    public record CreateContractTemplateRequest(
            String name, String contractType, String applicableSubject, String bodyTemplate,
            String requiredClauses, String version, String status, String updatedBy) {
    }

    @PostMapping
    public ApiResp<ContractTemplate> create(@RequestBody CreateContractTemplateRequest req) {
        if (req.name() == null || req.name().isBlank()) {
            throw new ApiException(400, "name is required");
        }
        ContractTemplate t = new ContractTemplate();
        t.setName(req.name());
        t.setContractType(req.contractType());
        t.setApplicableSubject(req.applicableSubject());
        t.setBodyTemplate(req.bodyTemplate());
        t.setRequiredClauses(req.requiredClauses());
        t.setVersion(req.version() == null || req.version().isBlank() ? "V1.0" : req.version());
        t.setStatus(req.status() == null || req.status().isBlank() ? "启用" : req.status());
        t.setUpdatedBy(req.updatedBy());
        t.setCreatedAt(Instant.now());
        return ApiResp.ok(templateRepo.save(t));
    }
}