import type { FastifyInstance } from 'fastify';
import type {
  AdoptWorktreeRequest,
  CommitWorktreeRequest,
  CreateWorktreeRequest,
  CreateWorktreeResponse,
  PromoteWorktreeRequest,
  PushWorktreeRequest,
  RepoBranchesResponse,
  SessionResponse,
  StartRepoSessionRequest,
  WorktreeBranchMode,
  WorktreeResponse,
  WorktreesListResponse,
} from '@arboretum/shared';
import type { WorktreeManager } from '../core/worktree-manager.js';
import type { Db } from '../db/index.js';
import { recordAudit } from '../core/audit-log.js';
import { sendManagerError } from './repos.js';

/** Mappe l'API (mode prioritaire ; `newBranch` déprécié) vers la stratégie de résolution de branche. */
function resolveMode(body: { mode?: unknown; newBranch?: unknown }): WorktreeBranchMode {
  if (body.mode === 'auto' || body.mode === 'create' || body.mode === 'checkout') return body.mode;
  if (body.newBranch === true) return 'create';
  if (body.newBranch === false) return 'checkout';
  return 'auto';
}

export function registerWorktreeRoutes(app: FastifyInstance, wt: WorktreeManager, db: Db): void {
  app.get('/api/v1/worktrees', async (): Promise<WorktreesListResponse> => ({ worktrees: await wt.listAllWorktrees() }));

  app.get('/api/v1/repos/:id/worktrees', async (req): Promise<WorktreesListResponse> => {
    const { id } = req.params as { id: string };
    return { worktrees: await wt.listRepoWorktrees(id) };
  });

  app.post('/api/v1/repos/:id/worktrees', async (req, reply) => {
    const { id } = req.params as { id: string };
    const body = req.body as Partial<CreateWorktreeRequest> | null;
    if (!body || typeof body.branch !== 'string' || body.branch.trim() === '') {
      return reply.status(400).send({ error: { code: 'BAD_REQUEST', message: 'branch is required' } });
    }
    if (body.startSession != null && body.startSession !== 'claude' && body.startSession !== 'bash') {
      return reply.status(400).send({ error: { code: 'BAD_REQUEST', message: 'startSession must be claude, bash or null' } });
    }
    try {
      const out = await wt.createWorktree(id, {
        branch: body.branch,
        mode: resolveMode(body), // défaut : auto (détecte créer / checkout / suivi remote)
        ...(body.baseRef !== undefined ? { baseRef: body.baseRef } : {}),
        ...(body.path !== undefined ? { path: body.path } : {}),
        ...(body.runHooks !== undefined ? { runHooks: body.runHooks } : {}),
        ...(body.preTrust !== undefined ? { preTrust: body.preTrust } : {}),
        ...(body.startSession !== undefined ? { startSession: body.startSession } : {}),
      });
      const res: CreateWorktreeResponse = out;
      return reply.status(201).send(res);
    } catch (err) {
      return sendManagerError(reply, err);
    }
  });

  // Branches du repo (locales + suivies de origin + défaut) : alimente le sélecteur de base côté UI.
  app.get('/api/v1/repos/:id/branches', async (req, reply) => {
    const { id } = req.params as { id: string };
    try {
      const out = await wt.listRepoBranches(id);
      return reply.send(out satisfies RepoBranchesResponse);
    } catch (err) {
      return sendManagerError(reply, err);
    }
  });

  // Session sur le checkout principal (« bosser sur la branche principale » sans worktree),
  // avec création/bascule de branche optionnelle côté serveur.
  app.post('/api/v1/repos/:id/session', async (req, reply) => {
    const { id } = req.params as { id: string };
    const body = (req.body as Partial<StartRepoSessionRequest> | null) ?? {};
    if (body.command != null && body.command !== 'claude' && body.command !== 'bash') {
      return reply.status(400).send({ error: { code: 'BAD_REQUEST', message: 'command must be claude or bash' } });
    }
    if (body.branch != null && typeof body.branch !== 'string') {
      return reply.status(400).send({ error: { code: 'BAD_REQUEST', message: 'branch must be a string' } });
    }
    if (body.newBranch != null && typeof body.newBranch !== 'boolean') {
      return reply.status(400).send({ error: { code: 'BAD_REQUEST', message: 'newBranch must be a boolean' } });
    }
    try {
      const out = await wt.startMainSession(id, {
        ...(body.command !== undefined ? { command: body.command } : {}),
        ...(body.branch !== undefined ? { branch: body.branch } : {}),
        ...(body.newBranch !== undefined ? { newBranch: body.newBranch } : {}),
      });
      const res: SessionResponse = { session: out.session };
      return reply.status(201).send(res);
    } catch (err) {
      return sendManagerError(reply, err);
    }
  });

  app.post('/api/v1/repos/:id/worktrees/adopt', async (req, reply) => {
    const { id } = req.params as { id: string };
    const body = req.body as Partial<AdoptWorktreeRequest> | null;
    if (!body || typeof body.path !== 'string') {
      return reply.status(400).send({ error: { code: 'BAD_REQUEST', message: 'path is required' } });
    }
    try {
      const out = await wt.adoptWorktree(id, {
        path: body.path,
        ...(body.runHooks !== undefined ? { runHooks: body.runHooks } : {}),
        ...(body.preTrust !== undefined ? { preTrust: body.preTrust } : {}),
      });
      const res: WorktreeResponse & { hookResults: typeof out.hookResults } = { worktree: out.worktree, hookResults: out.hookResults };
      return reply.send(res);
    } catch (err) {
      return sendManagerError(reply, err);
    }
  });

  app.post('/api/v1/repos/:id/worktrees/prune', async (req, reply) => {
    const { id } = req.params as { id: string };
    try {
      await wt.prune(id);
      return reply.send({ ok: true });
    } catch (err) {
      return sendManagerError(reply, err);
    }
  });

  // Commit (git add -A + commit) dans un worktree (ou le checkout principal).
  app.post('/api/v1/repos/:id/worktrees/commit', async (req, reply) => {
    const { id } = req.params as { id: string };
    const body = req.body as Partial<CommitWorktreeRequest> | null;
    if (!body || typeof body.path !== 'string') {
      return reply.status(400).send({ error: { code: 'BAD_REQUEST', message: 'path is required' } });
    }
    const amend = body.amend === true;
    if (!amend && (typeof body.message !== 'string' || body.message.trim() === '')) {
      return reply.status(400).send({ error: { code: 'BAD_REQUEST', message: 'message is required' } });
    }
    const mode = body.mode === 'staged' ? 'staged' : 'all';
    try {
      const worktree = await wt.commitWorktree(id, body.path, {
        message: typeof body.message === 'string' ? body.message.trim() : '',
        mode,
        amend,
      });
      recordAudit(db, { actor: req.authContext?.tokenId ?? 'unknown', action: 'worktree.commit', resourceId: id, details: { path: body.path, mode, amend } });
      return reply.send({ worktree } satisfies WorktreeResponse);
    } catch (err) {
      return sendManagerError(reply, err);
    }
  });

  // Push de la branche d'un worktree (upstream auto si absent).
  app.post('/api/v1/repos/:id/worktrees/push', async (req, reply) => {
    const { id } = req.params as { id: string };
    const body = req.body as Partial<PushWorktreeRequest> | null;
    if (!body || typeof body.path !== 'string') {
      return reply.status(400).send({ error: { code: 'BAD_REQUEST', message: 'path is required' } });
    }
    try {
      const worktree = await wt.pushWorktree(id, body.path);
      recordAudit(db, { actor: req.authContext?.tokenId ?? 'unknown', action: 'worktree.push', resourceId: id, details: { path: body.path } });
      return reply.send({ worktree } satisfies WorktreeResponse);
    } catch (err) {
      return sendManagerError(reply, err);
    }
  });

  // Promotion « en principal » : la branche du worktree devient le checkout principal (worktree supprimé).
  app.post('/api/v1/repos/:id/worktrees/promote', async (req, reply) => {
    const { id } = req.params as { id: string };
    const body = req.body as Partial<PromoteWorktreeRequest> | null;
    if (!body || typeof body.path !== 'string') {
      return reply.status(400).send({ error: { code: 'BAD_REQUEST', message: 'path is required' } });
    }
    try {
      const worktree = await wt.promoteWorktree(id, body.path, body.force === true);
      recordAudit(db, { actor: req.authContext?.tokenId ?? 'unknown', action: 'worktree.promote', resourceId: id, details: { path: body.path } });
      return reply.send({ worktree });
    } catch (err) {
      return sendManagerError(reply, err);
    }
  });

  app.delete('/api/v1/repos/:id/worktrees', async (req, reply) => {
    const { id } = req.params as { id: string };
    const query = req.query as { path?: string; force?: string };
    if (typeof query.path !== 'string') {
      return reply.status(400).send({ error: { code: 'BAD_REQUEST', message: 'path query param is required' } });
    }
    try {
      await wt.deleteWorktree(id, query.path, query.force === 'true');
      return reply.send({ ok: true });
    } catch (err) {
      return sendManagerError(reply, err);
    }
  });
}