/**
 * Initiative Router — create, list, get, update, merge config
 */

import { TRPCError } from '@trpc/server';
import { z } from 'zod';
import type { ProcedureBuilder } from '../trpc.js';
import { requireAgentManager, requireInitiativeRepository, requireProjectRepository, requireTaskRepository } from './_helpers.js';
import { deriveInitiativeActivity } from './initiative-activity.js';
import { buildDiscussPrompt } from '../../agent/prompts/index.js';

export function initiativeProcedures(publicProcedure: ProcedureBuilder) {
  return {
    createInitiative: publicProcedure
      .input(z.object({
        name: z.string().min(1),
        description: z.string().optional(),
        branch: z.string().nullable().optional(),
        projectIds: z.array(z.string().min(1)).min(1).optional(),
        executionMode: z.enum(['yolo', 'review_per_phase']).optional(),
      }))
      .mutation(async ({ ctx, input }) => {
        const repo = requireInitiativeRepository(ctx);

        if (input.projectIds && input.projectIds.length > 0) {
          const projectRepo = requireProjectRepository(ctx);
          for (const pid of input.projectIds) {
            const project = await projectRepo.findById(pid);
            if (!project) {
              throw new TRPCError({
                code: 'NOT_FOUND',
                message: `Project '${pid}' not found`,
              });
            }
          }
        }

        const initiative = await repo.create({
          name: input.name,
          status: 'active',
          ...(input.executionMode && { executionMode: input.executionMode }),
          ...(input.branch && { branch: input.branch }),
        });

        if (input.projectIds && input.projectIds.length > 0) {
          const projectRepo = requireProjectRepository(ctx);
          await projectRepo.setInitiativeProjects(initiative.id, input.projectIds);
        }

        if (ctx.pageRepository) {
          await ctx.pageRepository.create({
            initiativeId: initiative.id,
            parentPageId: null,
            title: input.name,
            content: null,
            sortOrder: 0,
          });
        }

        // Auto-spawn discuss agent when description is provided
        if (input.description?.trim() && ctx.agentManager && ctx.taskRepository) {
          try {
            const taskRepo = requireTaskRepository(ctx);
            const agentManager = requireAgentManager(ctx);

            const task = await taskRepo.create({
              initiativeId: initiative.id,
              name: `Discuss: ${initiative.name}`,
              description: input.description.trim(),
              category: 'discuss',
              status: 'in_progress',
            });

            const prompt = buildDiscussPrompt();

            agentManager.spawn({
              taskId: task.id,
              prompt,
              mode: 'discuss',
              initiativeId: initiative.id,
              inputContext: { initiative },
            });
          } catch {
            // Fire-and-forget — don't fail initiative creation if agent spawn fails
          }
        }

        return initiative;
      }),

    listInitiatives: publicProcedure
      .input(z.object({
        status: z.enum(['active', 'completed', 'archived']).optional(),
      }).optional())
      .query(async ({ ctx, input }) => {
        const repo = requireInitiativeRepository(ctx);
        const initiatives = input?.status
          ? await repo.findByStatus(input.status)
          : await repo.findAll();

        // Fetch active detail agents once for all initiatives
        const allAgents = ctx.agentManager ? await ctx.agentManager.list() : [];
        const activeDetailAgents = allAgents
          .filter(a =>
            a.mode === 'detail'
            && (a.status === 'running' || a.status === 'waiting_for_input')
            && !a.userDismissedAt,
          )
          .map(a => ({ initiativeId: a.initiativeId ?? '', mode: a.mode ?? '', status: a.status }));

        if (ctx.phaseRepository) {
          const phaseRepo = ctx.phaseRepository;
          return Promise.all(initiatives.map(async (init) => {
            const phases = await phaseRepo.findByInitiativeId(init.id);
            return { ...init, activity: deriveInitiativeActivity(init, phases, activeDetailAgents) };
          }));
        }

        return initiatives.map(init => ({
          ...init,
          activity: deriveInitiativeActivity(init, [], activeDetailAgents),
        }));
      }),

    getInitiative: publicProcedure
      .input(z.object({ id: z.string().min(1) }))
      .query(async ({ ctx, input }) => {
        const repo = requireInitiativeRepository(ctx);
        const initiative = await repo.findById(input.id);
        if (!initiative) {
          throw new TRPCError({
            code: 'NOT_FOUND',
            message: `Initiative '${input.id}' not found`,
          });
        }

        let projects: Array<{ id: string; name: string; url: string }> = [];
        if (ctx.projectRepository) {
          const fullProjects = await ctx.projectRepository.findProjectsByInitiativeId(input.id);
          projects = fullProjects.map((p) => ({ id: p.id, name: p.name, url: p.url }));
        }

        let branchLocked = false;
        if (ctx.taskRepository) {
          const tasks = await ctx.taskRepository.findByInitiativeId(input.id);
          branchLocked = tasks.some((t) => t.status !== 'pending');
        }

        return { ...initiative, projects, branchLocked };
      }),

    updateInitiative: publicProcedure
      .input(z.object({
        id: z.string().min(1),
        name: z.string().min(1).optional(),
        status: z.enum(['active', 'completed', 'archived']).optional(),
      }))
      .mutation(async ({ ctx, input }) => {
        const repo = requireInitiativeRepository(ctx);
        const { id, ...data } = input;
        return repo.update(id, data);
      }),

    deleteInitiative: publicProcedure
      .input(z.object({ id: z.string().min(1) }))
      .mutation(async ({ ctx, input }) => {
        const repo = requireInitiativeRepository(ctx);
        await repo.delete(input.id);
        return { success: true };
      }),

    updateInitiativeConfig: publicProcedure
      .input(z.object({
        initiativeId: z.string().min(1),
        mergeRequiresApproval: z.boolean().optional(),
        executionMode: z.enum(['yolo', 'review_per_phase']).optional(),
        branch: z.string().nullable().optional(),
      }))
      .mutation(async ({ ctx, input }) => {
        const repo = requireInitiativeRepository(ctx);
        const { initiativeId, ...data } = input;

        const existing = await repo.findById(initiativeId);
        if (!existing) {
          throw new TRPCError({
            code: 'NOT_FOUND',
            message: `Initiative '${initiativeId}' not found`,
          });
        }

        // Prevent branch changes once work has started
        if (data.branch !== undefined && ctx.taskRepository) {
          const tasks = await ctx.taskRepository.findByInitiativeId(initiativeId);
          const hasStarted = tasks.some((t) => t.status !== 'pending');
          if (hasStarted) {
            throw new TRPCError({
              code: 'PRECONDITION_FAILED',
              message: 'Cannot change branch after work has started',
            });
          }
        }

        return repo.update(initiativeId, data);
      }),
  };
}