import { resolve } from "node:path";
import { loadConfig, type AppConfig } from "../config.js";
import { parseEnvFile, writeEnvFileUpdates } from "./env-store.js";

export type RuntimeNotificationSettings = {
  webhookUrl: string;
  minSeverity: "info" | "warning" | "critical";
  alwaysNotifyTypes: string[];
};

export type SecurityPolicySettings = {
  violationMode: "hard_abort" | "validation_fail";
  allowedBinaries: string[];
  commandTimeoutMs: number;
  inheritedEnv: string[];
  scrubbedEnv: string[];
};

export type LimitSettings = {
  maxConcurrent: number;
  maxSession: number;
  maxRecursiveDepth: number;
  topologyMaxDepth: number;
  topologyMaxRetries: number;
  relationshipMaxChildren: number;
  mergeConflictMaxAttempts: number;
  portBase: number;
  portBlockSize: number;
  portBlockCount: number;
  portPrimaryOffset: number;
};

export type UiConfigSnapshot = {
  envFilePath: string;
  runtimeEvents: RuntimeNotificationSettings;
  security: SecurityPolicySettings;
  limits: LimitSettings;
  paths: {
    stateRoot: string;
    projectContextPath: string;
    runtimeEventLogPath: string;
    claudeTraceLogPath: string;
    securityAuditLogPath: string;
  };
};

function toCsv(values: readonly string[]): string {
  return values.join(",");
}

function sanitizeCsv(values: readonly string[]): string[] {
  const output: string[] = [];
  const seen = new Set<string>();

  for (const value of values) {
    const normalized = value.trim();
    if (!normalized || seen.has(normalized)) {
      continue;
    }
    seen.add(normalized);
    output.push(normalized);
  }

  return output;
}

function toRuntimeEvents(config: Readonly<AppConfig>): RuntimeNotificationSettings {
  return {
    webhookUrl: config.runtimeEvents.discordWebhookUrl ?? "",
    minSeverity: config.runtimeEvents.discordMinSeverity,
    alwaysNotifyTypes: [...config.runtimeEvents.discordAlwaysNotifyTypes],
  };
}

function toSecurity(config: Readonly<AppConfig>): SecurityPolicySettings {
  return {
    violationMode: config.security.violationHandling,
    allowedBinaries: [...config.security.shellAllowedBinaries],
    commandTimeoutMs: config.security.commandTimeoutMs,
    inheritedEnv: [...config.security.inheritedEnvVars],
    scrubbedEnv: [...config.security.scrubbedEnvVars],
  };
}

function toLimits(config: Readonly<AppConfig>): LimitSettings {
  return {
    maxConcurrent: config.agentManager.maxConcurrentAgents,
    maxSession: config.agentManager.maxSessionAgents,
    maxRecursiveDepth: config.agentManager.maxRecursiveDepth,
    topologyMaxDepth: config.orchestration.maxDepth,
    topologyMaxRetries: config.orchestration.maxRetries,
    relationshipMaxChildren: config.orchestration.maxChildren,
    mergeConflictMaxAttempts: config.orchestration.mergeConflictMaxAttempts,
    portBase: config.provisioning.portRange.basePort,
    portBlockSize: config.provisioning.portRange.blockSize,
    portBlockCount: config.provisioning.portRange.blockCount,
    portPrimaryOffset: config.provisioning.portRange.primaryPortOffset,
  };
}

function toSnapshot(config: Readonly<AppConfig>, envFilePath: string): UiConfigSnapshot {
  return {
    envFilePath,
    runtimeEvents: toRuntimeEvents(config),
    security: toSecurity(config),
    limits: toLimits(config),
    paths: {
      stateRoot: config.orchestration.stateRoot,
      projectContextPath: config.orchestration.projectContextPath,
      runtimeEventLogPath: config.runtimeEvents.logPath,
      claudeTraceLogPath: config.provider.claudeObservability.logPath,
      securityAuditLogPath: config.security.auditLogPath,
    },
  };
}

function mergeEnv(fileValues: Record<string, string>): NodeJS.ProcessEnv {
  return {
    ...process.env,
    ...fileValues,
  };
}

export class UiConfigStore {
  private readonly envFilePath: string;

  constructor(input: { workspaceRoot: string; envFilePath?: string }) {
    this.envFilePath = resolve(input.workspaceRoot, input.envFilePath ?? ".env");
  }

  getEnvFilePath(): string {
    return this.envFilePath;
  }

  async readSnapshot(): Promise<UiConfigSnapshot> {
    const parsed = await parseEnvFile(this.envFilePath);
    const config = loadConfig(mergeEnv(parsed.values));
    return toSnapshot(config, this.envFilePath);
  }

  async updateRuntimeEvents(input: RuntimeNotificationSettings): Promise<UiConfigSnapshot> {
    const alwaysNotifyTypes = sanitizeCsv(input.alwaysNotifyTypes);

    const updates: Record<string, string> = {
      AGENT_RUNTIME_DISCORD_WEBHOOK_URL: input.webhookUrl.trim(),
      AGENT_RUNTIME_DISCORD_MIN_SEVERITY: input.minSeverity,
      AGENT_RUNTIME_DISCORD_ALWAYS_NOTIFY_TYPES: toCsv(alwaysNotifyTypes),
    };

    const parsed = await writeEnvFileUpdates(this.envFilePath, updates);
    const config = loadConfig(mergeEnv(parsed.values));
    return toSnapshot(config, this.envFilePath);
  }

  async updateSecurityPolicy(input: SecurityPolicySettings): Promise<UiConfigSnapshot> {
    const updates: Record<string, string> = {
      AGENT_SECURITY_VIOLATION_MODE: input.violationMode,
      AGENT_SECURITY_ALLOWED_BINARIES: toCsv(sanitizeCsv(input.allowedBinaries)),
      AGENT_SECURITY_COMMAND_TIMEOUT_MS: String(input.commandTimeoutMs),
      AGENT_SECURITY_ENV_INHERIT: toCsv(sanitizeCsv(input.inheritedEnv)),
      AGENT_SECURITY_ENV_SCRUB: toCsv(sanitizeCsv(input.scrubbedEnv)),
    };

    const parsed = await writeEnvFileUpdates(this.envFilePath, updates);
    const config = loadConfig(mergeEnv(parsed.values));
    return toSnapshot(config, this.envFilePath);
  }

  async updateLimits(input: LimitSettings): Promise<UiConfigSnapshot> {
    const updates: Record<string, string> = {
      AGENT_MAX_CONCURRENT: String(input.maxConcurrent),
      AGENT_MAX_SESSION: String(input.maxSession),
      AGENT_MAX_RECURSIVE_DEPTH: String(input.maxRecursiveDepth),
      AGENT_TOPOLOGY_MAX_DEPTH: String(input.topologyMaxDepth),
      AGENT_TOPOLOGY_MAX_RETRIES: String(input.topologyMaxRetries),
      AGENT_RELATIONSHIP_MAX_CHILDREN: String(input.relationshipMaxChildren),
      AGENT_MERGE_CONFLICT_MAX_ATTEMPTS: String(input.mergeConflictMaxAttempts),
      AGENT_PORT_BASE: String(input.portBase),
      AGENT_PORT_BLOCK_SIZE: String(input.portBlockSize),
      AGENT_PORT_BLOCK_COUNT: String(input.portBlockCount),
      AGENT_PORT_PRIMARY_OFFSET: String(input.portPrimaryOffset),
    };

    const parsed = await writeEnvFileUpdates(this.envFilePath, updates);
    const config = loadConfig(mergeEnv(parsed.values));
    return toSnapshot(config, this.envFilePath);
  }
}