import * as path from 'path';
import * as vscode from 'vscode';
import { SidebarChatProvider } from '../sidebarProvider';
import { logError, logInfo } from '../utils';
import {
    resolveScopeForAgent,
    openKnowledgeMapEditor,
    getOrCreateAgentEntry,
    upsertAgentEntry,
} from '../skills/agentKnowledgeMap';
import { getActiveBrainProfile } from '../utils';

/**
 * Handles agent-skill messages: the per-conversation agent picker, agent CRUD,
 * persisting the user's last selected agent, and the knowledge-map dropdown.
 */
export async function handleAgentMessage(provider: SidebarChatProvider, data: any): Promise<boolean> {
    switch (data.type) {
        case 'getAgents':
            await provider._sendAgentsList();
            return true;
        case 'createAgent':
            await provider._createAgent();
            return true;
        case 'getAgentContent':
            await provider._sendAgentContent(data.path);
            return true;
        case 'updateAgent':
            await provider._updateAgent(data.path, data.content, data.negativePrompt);
            return true;
        case 'deleteAgent':
            await provider._deleteAgent(data.path);
            return true;
        case 'saveAgentSelection':
            await provider._context.globalState.update(SidebarChatProvider.lastAgentStateKey, data.path || 'none');
            logInfo(`Agent selection saved: ${data.path}`);
            void provider._sendReadyStatus();
            return true;
        case 'getKnowledgeScope': {
            const view = (provider as any)._view as vscode.WebviewView | undefined;
            if (!view) return true;
            const brain = getActiveBrainProfile();
            const brainRoot = brain?.localBrainPath || '';
            const scope = resolveScopeForAgent(data.agentPath || '', brainRoot);
            const folders = scope.folders.map((abs) => ({
                absolute: abs,
                relative: brainRoot ? path.relative(brainRoot, abs) || abs : abs,
            }));
            view.webview.postMessage({
                type: 'knowledgeScope',
                value: {
                    agent: scope.agent?.name ?? null,
                    folders,
                    source: scope.source,
                    brainRoot,
                },
            });
            void provider._sendReadyStatus();
            return true;
        }
        case 'editKnowledgeMap':
            await openKnowledgeMapEditor();
            return true;
        case 'getAgentMap': {
            const view = (provider as any)._view as vscode.WebviewView | undefined;
            if (!view) return true;
            try {
                const entry = getOrCreateAgentEntry(data.agentPath || '');
                const hasWeightOverride = typeof entry.secondBrainWeight === 'number';
                const knowledgeMapHasEntry = entry.knowledgeFolders.length > 0
                    || (entry.skillFolders?.length ?? 0) > 0
                    || !!(entry.model && entry.model.trim())
                    || hasWeightOverride;
                view.webview.postMessage({
                    type: 'agentMapData',
                    value: {
                        name: entry.name,
                        knowledgeFolders: entry.knowledgeFolders,
                        skillFolders: entry.skillFolders || [],
                        // Per-agent model override — empty string means "use current default model".
                        model: entry.model || '',
                        // null = no override (fall back to global slider); number = pinned 0–100.
                        secondBrainWeight: hasWeightOverride ? entry.secondBrainWeight : null,
                        exists: knowledgeMapHasEntry,
                    },
                });
            } catch (e: any) {
                logError('agent-map: load failed.', { error: e?.message ?? String(e) });
                view.webview.postMessage({
                    type: 'agentMapData',
                    value: { name: '', knowledgeFolders: [], skillFolders: [], model: '', secondBrainWeight: null, exists: false },
                });
            }
            return true;
        }
        case 'saveAgentMap': {
            const view = (provider as any)._view as vscode.WebviewView | undefined;
            if (!view) return true;
            const agentPath = typeof data.agentPath === 'string' ? data.agentPath : '';
            const name = path.basename(agentPath).replace(/\.(md|markdown)$/i, '').trim();
            const knowledgeFolders = Array.isArray(data.knowledgeFolders)
                ? data.knowledgeFolders.filter((f: unknown) => typeof f === 'string')
                : [];
            const skillFolders = Array.isArray(data.skillFolders)
                ? data.skillFolders.filter((f: unknown) => typeof f === 'string')
                : [];
            // Treat blank / "Use current model" as no override — drop the field entirely
            // so the JSON stays clean and the resolver falls back to the global default.
            const modelOverride = typeof data.model === 'string' ? data.model.trim() : '';
            // null / undefined / non-finite = "Use global setting" → drop the field.
            let weightOverride: number | undefined;
            if (typeof data.secondBrainWeight === 'number' && Number.isFinite(data.secondBrainWeight)) {
                weightOverride = Math.max(0, Math.min(100, Math.round(data.secondBrainWeight)));
            }
            const result = upsertAgentEntry({
                name,
                knowledgeFolders,
                skillFolders,
                model: modelOverride || undefined,
                secondBrainWeight: weightOverride,
            });
            view.webview.postMessage({
                type: 'agentMapSaved',
                value: { ok: result.ok, path: result.path, error: result.error },
            });
            return true;
        }
        case 'pickPath': {
            const view = (provider as any)._view as vscode.WebviewView | undefined;
            if (!view) return true;
            const kind = data.kind === 'skillFile' ? 'skillFile'
                : data.kind === 'skillFolder' ? 'skillFolder'
                : 'knowledgeFolder';
            const isFile = kind === 'skillFile';
            const label = kind === 'knowledgeFolder' ? 'Select Knowledge Folder'
                : kind === 'skillFolder' ? 'Select Skill Folder'
                : 'Select Skill File (.md)';
            const defaultUri = (() => {
                if (kind === 'knowledgeFolder') {
                    const brain = getActiveBrainProfile();
                    if (brain?.localBrainPath) return vscode.Uri.file(brain.localBrainPath);
                }
                return undefined;
            })();
            try {
                const picked = await vscode.window.showOpenDialog({
                    canSelectFiles: isFile,
                    canSelectFolders: !isFile,
                    canSelectMany: false,
                    openLabel: label,
                    defaultUri,
                    filters: isFile ? { Markdown: ['md', 'markdown'] } : undefined,
                });
                const fsPath = picked?.[0]?.fsPath || '';
                if (fsPath) {
                    view.webview.postMessage({
                        type: 'pickedPath',
                        value: { kind, path: fsPath },
                    });
                }
            } catch (e: any) {
                logError('agent-map: pick failed.', { kind, error: e?.message ?? String(e) });
            }
            return true;
        }
        default:
            return false;
    }
}