package com.kaidi.oa.web;

import com.kaidi.oa.common.Money;

import com.kaidi.oa.common.ApiException;
import com.kaidi.oa.common.ApiResp;
import com.kaidi.oa.common.NotFoundException;
import com.kaidi.oa.domain.Declaration;
import com.kaidi.oa.repository.DeclarationRepository;
import org.springframework.web.bind.annotation.DeleteMapping;
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.PutMapping;
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;

/**
 * R&D innovation center: government program declarations (政府项目申报). program
 * is one of 高新技术企业 / 科技型中小企业 / 省重点研发计划 / 专精特新 / 创新平台;
 * status is one of 准备中 / 已申报 / 已立项 / 已结题 / 未通过. Tail link of business
 * chain 6: rdProjectId (nullable) references an RdProject.
 */
@RestController
@RequestMapping("/api/oa/declarations")
public class DeclarationController {

    private final DeclarationRepository declarationRepo;

    public DeclarationController(DeclarationRepository declarationRepo) {
        this.declarationRepo = declarationRepo;
    }

    @GetMapping
    public ApiResp<List<Declaration>> list(@RequestParam(required = false) String program,
                                           @RequestParam(required = false) String status) {
        List<Declaration> list;
        if (program != null && !program.isBlank()) {
            list = declarationRepo.findByProgram(program);
        } else if (status != null && !status.isBlank()) {
            list = declarationRepo.findByStatus(status);
        } else {
            list = declarationRepo.findAll();
        }
        return ApiResp.ok(list);
    }

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

    public record CreateDeclarationRequest(
            String name, String program, String authority, Long rdProjectId, Double amount,
            String deadline, String status, String owner) {
    }

    @PostMapping
    public ApiResp<Declaration> create(@RequestBody CreateDeclarationRequest req) {
        if (req.name() == null || req.name().isBlank()) {
            throw new ApiException(400, "name is required");
        }
        Declaration d = new Declaration();
        d.setName(req.name());
        d.setProgram(req.program());
        d.setAuthority(req.authority());
        d.setRdProjectId(req.rdProjectId());
        d.setAmount(Money.of(req.amount() == null ? 0 : req.amount()));
        d.setDeadline(req.deadline());
        d.setStatus(req.status() == null || req.status().isBlank() ? "准备中" : req.status());
        d.setOwner(req.owner());
        d.setCreatedAt(Instant.now());
        return ApiResp.ok(declarationRepo.save(d));
    }

    /** PUT /{id} -> 编辑政府项目申报; 只覆盖请求体里给出的字段。 */
    @PutMapping("/{id}")
    public ApiResp<Declaration> update(@PathVariable Long id, @RequestBody CreateDeclarationRequest req) {
        Declaration d = declarationRepo.findById(id)
                .orElseThrow(() -> new NotFoundException("declaration not found: " + id));
        if (req.name() != null) {
            if (req.name().isBlank()) {
                throw new ApiException(400, "name is required");
            }
            d.setName(req.name());
        }
        if (req.program() != null) d.setProgram(req.program());
        if (req.authority() != null) d.setAuthority(req.authority());
        if (req.rdProjectId() != null) d.setRdProjectId(req.rdProjectId());
        if (req.amount() != null) d.setAmount(Money.of(req.amount()));
        if (req.deadline() != null) d.setDeadline(req.deadline());
        if (req.status() != null && !req.status().isBlank()) d.setStatus(req.status());
        // 归属仅 create 定调, update 不接收客户端 owner, 不得被篡改。
        return ApiResp.ok(declarationRepo.save(d));
    }

    /** DELETE /{id} -> 删除政府项目申报。 */
    @DeleteMapping("/{id}")
    public ApiResp<Void> delete(@PathVariable Long id) {
        if (!declarationRepo.existsById(id)) {
            throw new NotFoundException("declaration not found: " + id);
        }
        declarationRepo.deleteById(id);
        return ApiResp.ok(null);
    }
}