import { Body, Controller, Delete, Get, Param, ParseUUIDPipe, Patch, Post, Query } from '@nestjs/common';
import { IsIn, IsOptional, IsString, IsUUID } from 'class-validator';
import { and, desc, eq, isNull } from 'drizzle-orm';
import { CurrentSession } from '../auth/session.decorator';
import type { AuthenticatedSession } from '../auth/tenant.guard';
import { db } from '../db/client';
import { actionPlans } from '../db/schema';

class CreateActionPlanDto {
  @IsString() title!: string;
  @IsOptional() @IsString() description?: string;
  @IsOptional() @IsIn(['draft','active','completed','cancelled']) status?: string;
  @IsOptional() @IsIn(['low','medium','high','critical']) priority?: string;
  @IsOptional() @IsString() owner?: string;
  @IsOptional() @IsString() dueDate?: string;
  @IsOptional() @IsUUID() decisionId?: string;
  @IsOptional() @IsUUID() goalId?: string;
  @IsOptional() @IsUUID() projectId?: string;
}

class UpdateActionPlanDto {
  @IsOptional() @IsString() title?: string;
  @IsOptional() @IsString() description?: string;
  @IsOptional() @IsIn(['draft','active','completed','cancelled']) status?: string;
  @IsOptional() @IsIn(['low','medium','high','critical']) priority?: string;
  @IsOptional() @IsString() owner?: string;
  @IsOptional() @IsString() dueDate?: string;
}

@Controller('action-plans')
export class ActionPlansController {
  @Get()
  async list(
    @CurrentSession() session: AuthenticatedSession,
    @Query('status') status?: string,
  ) {
    const tid = session.tenantId;
    const where = status
      ? and(eq(actionPlans.tenantId, tid), isNull(actionPlans.deletedAt), eq(actionPlans.status, status))
      : and(eq(actionPlans.tenantId, tid), isNull(actionPlans.deletedAt));
    return db.query.actionPlans.findMany({ where, orderBy: [desc(actionPlans.createdAt)], limit: 200 });
  }

  @Post()
  async create(@CurrentSession() session: AuthenticatedSession, @Body() dto: CreateActionPlanDto) {
    const [row] = await db.insert(actionPlans).values({
      tenantId: session.tenantId,
      title: dto.title,
      description: dto.description,
      status: dto.status ?? 'draft',
      priority: dto.priority ?? 'medium',
      owner: dto.owner,
      dueDate: dto.dueDate ?? null,
      decisionId: dto.decisionId ?? null,
      goalId: dto.goalId ?? null,
      projectId: dto.projectId ?? null,
    }).returning();
    return row;
  }

  @Patch(':id')
  async update(
    @CurrentSession() session: AuthenticatedSession,
    @Param('id', ParseUUIDPipe) id: string,
    @Body() dto: UpdateActionPlanDto,
  ) {
    const updates: Record<string, unknown> = { updatedAt: new Date() };
    if (dto.title !== undefined)       updates.title = dto.title;
    if (dto.description !== undefined) updates.description = dto.description;
    if (dto.status !== undefined) {
      updates.status = dto.status;
      if (dto.status === 'completed') updates.completedAt = new Date();
    }
    if (dto.priority !== undefined) updates.priority = dto.priority;
    if (dto.owner !== undefined)    updates.owner = dto.owner;
    if (dto.dueDate !== undefined)  updates.dueDate = dto.dueDate;
    const [row] = await db.update(actionPlans)
      .set(updates)
      .where(and(eq(actionPlans.id, id), eq(actionPlans.tenantId, session.tenantId)))
      .returning();
    return row;
  }

  @Delete(':id')
  async remove(@CurrentSession() session: AuthenticatedSession, @Param('id', ParseUUIDPipe) id: string) {
    await db.update(actionPlans)
      .set({ deletedAt: new Date() })
      .where(and(eq(actionPlans.id, id), eq(actionPlans.tenantId, session.tenantId)));
    return { deleted: true };
  }
}