import { z } from "zod";

import {
  procedureClassificationSchema,
  procedureIdentitySchema,
  localVariableSchema,
  functionDossierSchema,
  functionBodySchema,
} from "../domain/hopperValues.js";
import { analysisProfileSchema } from "../domain/analysisProfile.js";
import {
  evidenceSchema,
  validateAnalysisProfileProvider,
} from "../domain/evidence.js";
import { jsonValueSchema } from "../domain/jsonValue.js";
import {
  PROVIDER_REJECTION_CODES,
  type ProviderRejectionCode,
} from "./providerSelection.js";
import {
  PROVIDER_FAILURE_STAGES,
  PROVIDER_OPERATION_STATES,
  PROVIDER_RETRY_ACTIONS,
} from "../domain/providerOperationHealth.js";
import { analysisErrorProjectionSchema } from "./errorSchemas.js";

/** Specialize the single normalized result inside a complete Evidence record. */
export const evidenceResultOf = <Schema extends z.ZodType>(schema: Schema) =>
  z
    .strictObject({ ...evidenceSchema.shape, normalized_result: schema })
    .superRefine(validateAnalysisProfileProvider);

/** Wrap a lifecycle result while preserving its exact schema type. */
export const lifecycleResultOf = <Schema extends z.ZodType>(schema: Schema) =>
  z.object({ result: schema });

/** Resolve a required named output schema or reject contract drift. */
export const requireOutputSchema = <
  Schemas extends Readonly<Record<string, z.ZodObject>>,
  Name extends keyof Schemas & string,
>(
  schemas: Schemas,
  name: Name,
): Schemas[Name] => {
  const schema = schemas[name];
  if (schema === undefined)
    throw new Error(`Missing output schema for ${name}`);
  return schema;
};

export const targetFormatSchema = z.enum([
  "hopper",
  "analysis-database",
  "mach-o",
  "elf",
  "pe",
  "dos-mz",
  "dos-com",
  "zip",
  "ipa",
  "apk",
  "msix",
  "appx",
  "asar",
  "dmg",
  "pkg",
  "plist",
  "javascript",
  "source-map",
]);

export const targetKindSchema = z.enum([
  "executable",
  "database",
  "archive",
  "artifact",
]);

const providerCapabilityFacts = {
  operation: z.string(),
  effects: z.object({
    mutates_artifact: z.boolean(),
    launches_process: z.boolean(),
    may_show_ui: z.boolean(),
    may_access_network: z.boolean(),
    may_write_filesystem: z.boolean(),
    changes_permissions: z.boolean(),
    requires_root: z.boolean(),
  }),
  limitations: z.array(z.string()),
};

export const providerCapability = z.discriminatedUnion("available", [
  z.object({
    ...providerCapabilityFacts,
    available: z.literal(true),
    reason: z.null(),
    availability_code: z.null(),
  }),
  z.object({
    ...providerCapabilityFacts,
    available: z.literal(false),
    reason: z.string().nullable(),
    availability_code: z.enum(PROVIDER_REJECTION_CODES).nullable(),
  }),
]);
export type ProviderCapability = z.output<typeof providerCapability>;

export const providerIdentity = z.object({
  id: z.string(),
  name: z.string(),
  version: z.string().nullable(),
});

const processCoordinates = {
  launcher_pid: z.number().int().min(1),
  process_group_id: z.number().int().min(1),
};

const processLineageObservation = z.discriminatedUnion("status", [
  z.object({
    status: z.literal("unavailable"),
    observed_at: z.iso.datetime(),
    ...processCoordinates,
    reason: z.string().min(1),
  }),
  z.object({
    status: z.literal("verified"),
    observed_at: z.iso.datetime(),
    ...processCoordinates,
    launcher_parent_pid: z.number().int().min(0),
    descendants: z.array(
      z.object({
        pid: z.number().int().min(1),
        parent_pid: z.number().int().min(0),
        process_group_id: z.number().int().min(1),
      }),
    ),
  }),
]);

const analysisRun = z
  .object({
    run_id: z.string().uuid(),
    process_lineage: z.discriminatedUnion("status", [
      z.object({ status: z.literal("not_observed") }),
      z.object({
        status: z.literal("snapshots"),
        snapshots: z.array(
          z.object({
            provider: providerIdentity,
            observation: processLineageObservation,
          }),
        ),
      }),
    ]),
  })
  .nullable();

export const analysisActivity = z.object({
  status: z.enum(["not_observed", "idle", "busy"]),
  providers: z.array(
    z.object({
      provider: providerIdentity,
      active: z
        .object({
          request_id: z.number().int().min(1),
          operation: z.string().min(1),
          elapsed_ms: z.number().int().min(0),
          caller_state: z.enum(["waiting", "cancelled"]),
        })
        .nullable(),
      queued_requests: z.number().int().min(0),
    }),
  ),
});

const providerOperationRequest = z.object({
  request_id: z.number().int().min(1),
  operation: z.string().min(1),
  stage: z.enum(PROVIDER_FAILURE_STAGES),
});

export const providerOperationHealth = z
  .object({
    state: z.enum(PROVIDER_OPERATION_STATES),
    stage: z.enum(PROVIDER_FAILURE_STAGES).nullable(),
    retry_action: z.enum(PROVIDER_RETRY_ACTIONS).nullable(),
    exit_code: z.number().int().nullable(),
    requests: z.array(providerOperationRequest),
  })
  .nullable();

const providerRejectionCode: z.ZodType<ProviderRejectionCode> = z.enum(
  PROVIDER_REJECTION_CODES,
);

const providerDiagnostics = z.record(z.string(), jsonValueSchema);

const providerAvailability = z.discriminatedUnion("status", [
  z.object({
    status: z.literal("available"),
    code: z.null(),
    reason: z.null(),
    diagnostics: providerDiagnostics,
  }),
  z.object({
    status: z.literal("unavailable"),
    code: providerRejectionCode,
    reason: z.string().min(1),
    diagnostics: providerDiagnostics,
  }),
]);

const providerTargetSupport = z.discriminatedUnion("status", [
  z.object({
    status: z.literal("unknown"),
    code: z.null(),
    reason: z.string().min(1),
    diagnostics: providerDiagnostics,
  }),
  z.object({
    status: z.literal("supported"),
    code: z.null(),
    reason: z.null(),
    diagnostics: providerDiagnostics,
  }),
  z.object({
    status: z.literal("unsupported"),
    code: z.enum([
      "target_kind_unsupported",
      "target_format_unsupported",
      "architecture_unsupported",
      "target_role_unsupported",
      "managed_target_unsupported",
    ]),
    reason: z.string().min(1),
    diagnostics: providerDiagnostics,
  }),
]);

const clientFeatureNameSchema = z.enum([
  "elicitation_form",
  "elicitation_url",
  "roots",
  "sampling",
]);

/** Negotiated MCP client features that affect REA workflow availability. */
export const clientFeatureAvailabilitySchema = z.object({
  elicitation_form: z.boolean(),
  elicitation_url: z.boolean(),
  roots: z.boolean(),
  sampling: z.boolean(),
});
export type ClientFeatureAvailability = z.infer<
  typeof clientFeatureAvailabilitySchema
>;

const toolAvailabilityMode = z.discriminatedUnion("available", [
  z.object({
    name: z.string(),
    available: z.literal(true),
    missing_operations: z.array(z.string()).length(0),
    remediation: z.null(),
  }),
  z.object({
    name: z.string(),
    available: z.literal(false),
    missing_operations: z.array(z.string()).min(1),
    remediation: z.string().nullable(),
  }),
]);
export type ToolAvailabilityMode = z.output<typeof toolAvailabilityMode>;

const toolAvailabilityFacts = {
  name: z.string(),
  surface: z.string(),
  default_mode_available: z.boolean().optional(),
  modes: z.array(toolAvailabilityMode).optional(),
  client_requirements: z.object({
    required: z.array(clientFeatureNameSchema),
    optional: z.array(clientFeatureNameSchema),
    missing_required: z.array(clientFeatureNameSchema),
    missing_optional: z.array(clientFeatureNameSchema),
  }),
  effects: z.strictObject({
    mutatesTarget: z.boolean(),
    mutatesSession: z.boolean(),
    writesFilesystem: z.boolean(),
    launchesProcess: z.boolean(),
    accessesNetwork: z.boolean(),
    changesUiState: z.boolean(),
    mayDiscardData: z.boolean(),
    idempotent: z.boolean(),
  }),
  annotations: z.object({
    read_only: z.boolean(),
    destructive: z.boolean(),
    idempotent: z.boolean(),
    open_world: z.boolean(),
  }),
};

export const toolUnavailabilityReason = z.enum([
  "client_capability_missing",
  "target_required",
  "provider_missing",
  "provider_unavailable",
  "target_unsupported",
  "unsupported_host",
]);

export const toolAvailability = z.discriminatedUnion("available", [
  z.object({
    ...toolAvailabilityFacts,
    available: z.literal(true),
    reason: z.literal("available"),
    remediation: z.null(),
  }),
  z.object({
    ...toolAvailabilityFacts,
    available: z.literal(false),
    reason: toolUnavailabilityReason,
    remediation: z.string().nullable(),
  }),
]);
export type ToolAvailability = z.output<typeof toolAvailability>;
export type ToolUnavailabilityReason = z.output<
  typeof toolUnavailabilityReason
>;

export const sessionProvider = z
  .object({
    capabilities: z.array(providerCapability),
    analysis_run: analysisRun,
    analysis_activity: analysisActivity,
    provider_operation_health: providerOperationHealth,
    analysis_provider_binding: z
      .object({
        provider: providerIdentity,
        selection_source: z.enum([
          "request",
          "environment",
          "auto-single-candidate",
        ]),
        analysis_profile: analysisProfileSchema,
      })
      .nullable(),
    analysis_provider_candidates: z.array(
      z.object({
        provider: providerIdentity,
        availability: providerAvailability,
        target_support: providerTargetSupport,
        selected: z.boolean(),
        capabilities: z.array(providerCapability),
      }),
    ),
    tool_availability: z.array(toolAvailability),
    client_features: z.object({
      elicitation_form: z.boolean(),
      elicitation_url: z.boolean(),
      roots: z.boolean(),
      sampling: z.boolean(),
    }),
    server_identity: z.object({
      package: z.object({
        name: z.string(),
        version: z.string(),
        root_path: z.string(),
        build_commit: z.string().nullable(),
      }),
      server: z.object({
        name: z.string(),
        version: z.string(),
        started_at: z.string(),
        command_path: z.string(),
      }),
      sdk: z.object({
        server: z.string(),
        client_test: z.string(),
        core: z.string(),
      }),
      negotiated_protocol_version: z.string().nullable(),
      client: z.object({ name: z.string(), version: z.string() }).nullable(),
      skill: z.object({ name: z.string(), expected_version: z.string() }),
      catalog: z.record(z.string(), jsonValueSchema),
      protocol_features: z.object({
        progress: z.boolean(),
        cancellation: z.boolean(),
        elicitation: z.boolean(),
      }),
      alignment: z.object({
        state: z.enum(["aligned", "mcp_server_restart_required", "unknown"]),
        reasons: z.array(z.string()),
        remediation: z.string().nullable(),
      }),
    }),
  })
  .passthrough();

export const nullableText = z.string().nullable();
export const addressList = z.array(z.string());
export const addressedEntry = z.object({
  address: z.string(),
  name: z.string(),
});
export const containingProcedureResolution = z.discriminatedUnion("found", [
  z.object({
    query_address: z.string(),
    found: z.literal(true),
    procedure: procedureIdentitySchema,
  }),
  z.object({
    query_address: z.string(),
    found: z.literal(false),
    procedure: z.null(),
    reason: z.enum(["outside_segments", "not_in_procedure"]),
  }),
]);

const unavailable = z.object({
  available: z.literal(false),
  reason: z.string(),
});

const availableMemoryPermissions = z.object({
  available: z.literal(true),
  source: z.literal("ghidra-memory-block"),
});

export const addressedValue = z.object({
  address: z.string(),
  value: z.string(),
  symbol: z
    .object({
      primary: z.boolean(),
      dynamic: z.boolean(),
      external: z.boolean(),
      type: z.string(),
      source: z.enum(["default", "analysis", "ai", "imported", "user_defined"]),
    })
    .optional(),
  procedure: z
    .object({
      external: z.boolean(),
      thunk: z.boolean(),
      thunk_target: z.string().nullable(),
    })
    .optional(),
  string: z
    .object({
      encoding: z.string(),
      termination: z.enum(["missing", "present_or_not_required"]),
      byte_length: z.number().int().min(0),
    })
    .optional(),
});

const memoryRegionOutput = z.object({
  name: z.string(),
  start: z.string(),
  end: z.string(),
  readable: z.boolean().nullable(),
  writable: z.boolean().nullable(),
  executable: z.boolean().nullable(),
  permissions: z.union([unavailable, availableMemoryPermissions]),
  provenance: z.enum(["hopper-public-python-api", "ghidra-memory-block"]),
  address_space: z.string().optional(),
  image_base: z.string().optional(),
  initialized: z.boolean().optional(),
  overlay: z.boolean().optional(),
});

export const segmentOutput = evidenceResultOf(
  z.array(memoryRegionOutput.extend({ sections: z.array(memoryRegionOutput) })),
);

export const procedureInfoOutput = evidenceResultOf(
  z.object({
    name: z.string(),
    entrypoint: z.string(),
    basicblock_count: z.number().int().min(0),
    length: z.number().min(0),
    signature: nullableText,
    locals: z.array(localVariableSchema),
    classification: procedureClassificationSchema.nullable(),
    body: functionBodySchema,
  }),
);

export const symbolDiscoveryOutput = (property: "classes" | "protocols") =>
  evidenceResultOf(
    z.object({
      count: z.number().int().min(0),
      [property]: z.array(addressedEntry),
    }),
  );

export const graphNode = z.discriminatedUnion("status", [
  z.object({
    address: z.string(),
    status: z.literal("ok"),
    calls: z.array(z.string()),
  }),
  z.object({
    address: z.string(),
    status: z.literal("error"),
    error: analysisErrorProjectionSchema,
  }),
]);

export const functionDossierOutput = evidenceResultOf(functionDossierSchema);