package vip.mate.agent.runtime;

import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.tags.Tag;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.web.bind.annotation.*;
import vip.mate.agent.delegation.SubagentRegistry;
import vip.mate.audit.service.AuditEventService;
import vip.mate.channel.web.ChatStreamTracker;
import vip.mate.common.result.R;
import vip.mate.exception.MateClawException;
import vip.mate.i18n.I18nService;
import vip.mate.workspace.conversation.ConversationService;

import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import vip.mate.workspace.core.annotation.RequireGlobalAdmin;
import vip.mate.agent.runtime.dsh.DshRuntimeService;

/**
 * Admin-only live runtime surface: the workspace view of every in-flight agent
 * turn plus the controls to friendly-stop, force-recycle, or sweep stuck
 * runs. Distinct from {@code /api/v1/subagents/...} which is per-conversation
 * owner-scoped.
 */
@Slf4j
@Tag(name = "Agent Runtime (Live)")
@RestController
@RequestMapping("/api/v1/admin/agent-runtime")
@RequiredArgsConstructor
public class AgentRuntimeController {

    private final AgentRuntimeAggregator aggregator;
    private final ChatStreamTracker streamTracker;
    private final SubagentRegistry subagentRegistry;
    private final AuditEventService auditEventService;
    private final ConversationService conversationService;
    private final I18nService i18nService;
    private final DshRuntimeService dshRuntimeService;

    @Operation(summary = "Snapshot of every in-flight agent turn")
    @GetMapping("/snapshot")
    @RequireGlobalAdmin
    public R<AgentRuntimeAggregator.RuntimeSnapshot> snapshot(
            @RequestHeader(value = "X-Workspace-Id", required = false) Long workspaceId,
            Authentication auth) {
        requireAdmin(auth);
        requireWorkspace(workspaceId);
        return R.ok(aggregator.snapshot(workspaceId));
    }

    @Operation(summary = "DSH runtime availability and capability diagnostics")
    @GetMapping("/dsh/diagnostics")
    @RequireGlobalAdmin
    public R<Map<String, Object>> dshDiagnostics(Authentication auth) {
        requireAdmin(auth);
        return R.ok(dshRuntimeService.diagnostics());
    }

    @Operation(summary = "Friendly stop — request the run to wind down at its next checkpoint")
    @PostMapping("/runs/{conversationId}/stop")
    @RequireGlobalAdmin
    public R<Map<String, Object>> stopFriendly(@PathVariable String conversationId,
                                               @RequestHeader(value = "X-Workspace-Id", required = false) Long workspaceId,
                                               Authentication auth) {
        requireAdmin(auth);
        requireRunInWorkspace(conversationId, workspaceId);
        boolean ok = streamTracker.requestStop(conversationId);
        recordAudit(auth, "agent-runtime.stop", conversationId, Map.of("result", ok));
        return R.ok(Map.of("stopped", ok));
    }

    @Operation(summary = "Force recycle — dispose flux + drop RunState; use after friendly stop ignored")
    @PostMapping("/runs/{conversationId}/recycle")
    @RequireGlobalAdmin
    public R<Map<String, Object>> recycle(@PathVariable String conversationId,
                                          @RequestHeader(value = "X-Workspace-Id", required = false) Long workspaceId,
                                          Authentication auth) {
        requireAdmin(auth);
        requireRunInWorkspace(conversationId, workspaceId);
        boolean ok = streamTracker.forceRecycle(conversationId);
        if (ok) {
            finalizeRecycledConversation(conversationId);
        }
        recordAudit(auth, "agent-runtime.recycle", conversationId, Map.of("result", ok));
        return R.ok(Map.of("recycled", ok));
    }

    @Operation(summary = "Interrupt one sub-agent (admin override of ownership check)")
    @PostMapping("/subagents/{subagentId}/interrupt")
    @RequireGlobalAdmin
    public R<Map<String, Object>> interruptSubagent(@PathVariable String subagentId,
                                                    @RequestHeader(value = "X-Workspace-Id", required = false) Long workspaceId,
                                                    Authentication auth) {
        requireAdmin(auth);
        requireSubagentInWorkspace(subagentId, workspaceId);
        boolean ok = subagentRegistry.interrupt(subagentId);
        recordAudit(auth, "agent-runtime.subagent.interrupt", subagentId, Map.of("result", ok));
        return R.ok(Map.of("interrupted", ok));
    }

    /**
     * Bulk recycle every run that the aggregator currently flags as stuck.
     * Returns the conversationIds that were touched so the caller can render
     * a confirmation toast without re-fetching.
     */
    @Operation(summary = "Recycle every run currently flagged as stuck")
    @PostMapping("/sweep")
    @RequireGlobalAdmin
    public R<Map<String, Object>> sweep(
            @RequestHeader(value = "X-Workspace-Id", required = false) Long workspaceId,
            Authentication auth) {
        requireAdmin(auth);
        requireWorkspace(workspaceId);
        AgentRuntimeAggregator.RuntimeSnapshot snap = aggregator.snapshot(workspaceId);
        List<String> ids = snap.runs().stream()
                .filter(r -> r.stuckReason() != null)
                .map(AgentRuntimeAggregator.RunCard::conversationId)
                .toList();
        int recycled = 0;
        for (String cid : ids) {
            if (streamTracker.forceRecycle(cid)) {
                recycled++;
                finalizeRecycledConversation(cid);
            }
        }
        recordAudit(auth, "agent-runtime.sweep", "all",
                Map.of("targets", ids, "recycled", recycled));
        return R.ok(Map.of("recycled", recycled, "ids", ids));
    }

    /**
     * Common DB-side cleanup after a successful {@code forceRecycle}:
     * <ol>
     *   <li>Flip {@code stream_status} off 'running' so the sidebar drops the
     *       生成中 badge immediately. (The late doOnCancel / doOnComplete may
     *       re-set this to 'idle' when the agent finally yields — same value,
     *       no-op.)</li>
     *   <li>If the conversation's last message is still a user turn — i.e.
     *       the agent was disposed before any text streamed and the
     *       emergencySaveCallback found nothing to persist — write a
     *       "已被用户中止" assistant marker so the UI shows what happened
     *       instead of a blank reply.</li>
     * </ol>
     */
    private void finalizeRecycledConversation(String conversationId) {
        try {
            conversationService.updateStreamStatus(conversationId, "idle");
        } catch (Exception e) {
            log.warn("recycle: failed to reset stream_status for {}: {}",
                    conversationId, e.getMessage());
        }
        try {
            conversationService.saveStopMarkerIfDangling(
                    conversationId, i18nService.msg("chat.stopMarker.userAborted"), "stopped");
        } catch (Exception e) {
            log.warn("recycle: failed to save stop marker for {}: {}",
                    conversationId, e.getMessage());
        }
    }

    private void requireAdmin(Authentication auth) {
        if (auth == null) {
            throw new MateClawException(401, "authentication required");
        }
        boolean isAdmin = auth.getAuthorities().stream()
                .map(GrantedAuthority::getAuthority)
                .anyMatch("ROLE_ADMIN"::equals);
        if (!isAdmin) {
            throw new MateClawException(403, "admin role required");
        }
    }

    private void requireWorkspace(Long workspaceId) {
        if (workspaceId == null) {
            throw new MateClawException(400, "workspace id required");
        }
    }

    private void requireRunInWorkspace(String conversationId, Long workspaceId) {
        requireWorkspace(workspaceId);
        if (!aggregator.runBelongsToWorkspace(conversationId, workspaceId)) {
            throw new MateClawException(404, "runtime run not found in workspace");
        }
    }

    private void requireSubagentInWorkspace(String subagentId, Long workspaceId) {
        requireWorkspace(workspaceId);
        if (!aggregator.subagentBelongsToWorkspace(subagentId, workspaceId)) {
            throw new MateClawException(404, "subagent not found in workspace");
        }
    }

    private void recordAudit(Authentication auth, String action,
                             String resourceId, Map<String, Object> detail) {
        try {
            String username = auth != null ? auth.getName() : "anonymous";
            Map<String, Object> payload = new LinkedHashMap<>();
            payload.put("by", username);
            payload.putAll(detail);
            auditEventService.record(action, "agent-runtime", resourceId, resourceId,
                    new com.fasterxml.jackson.databind.ObjectMapper().writeValueAsString(payload));
        } catch (Exception e) {
            log.warn("audit serialization failed for {}: {}", action, e.getMessage());
        }
    }
}