import type { Prisma } from "@capakraken/db";
import type { TRPCContext } from "../../trpc.js";
import {
  CreateCountrySchema,
  CreateMetroCitySchema,
  UpdateCountrySchema,
  UpdateMetroCitySchema,
} from "@capakraken/shared";
import { z } from "zod";
import type { ToolContext, ToolDef, ToolExecutor } from "./shared.js";

type AssistantToolErrorResult = { error: string };

type CountryRecord = {
  id: string;
  code: string;
  name: string;
  dailyWorkingHours: number;
  scheduleRules?: Prisma.JsonValue | null;
  isActive?: boolean | null;
  metroCities?: Array<{ id: string; name: string }> | null;
  _count?: { resources?: number | null } | null;
};

type MetroCityRecord = {
  id: string;
  name: string;
};

type CountryMetroAdminDeps = {
  createCountryCaller: (ctx: TRPCContext) => {
    create: (params: z.input<typeof CreateCountrySchema>) => Promise<CountryRecord>;
    update: (params: {
      id: string;
      data: z.input<typeof UpdateCountrySchema>;
    }) => Promise<CountryRecord>;
    createCity: (params: z.input<typeof CreateMetroCitySchema>) => Promise<MetroCityRecord>;
    updateCity: (params: {
      id: string;
      data: z.input<typeof UpdateMetroCitySchema>;
    }) => Promise<MetroCityRecord>;
    deleteCity: (params: { id: string }) => Promise<{ name?: string | null }>;
  };
  createScopedCallerContext: (ctx: ToolContext) => TRPCContext;
  assertAdminRole: (ctx: ToolContext) => void;
  formatCountry: (country: CountryRecord) => unknown;
  toAssistantCountryMutationError: (
    error: unknown,
  ) => AssistantToolErrorResult | null;
  toAssistantMetroCityMutationError: (
    error: unknown,
  ) => AssistantToolErrorResult | null;
};

export const countryMetroAdminToolDefinitions: ToolDef[] = [
  {
    type: "function",
    function: {
      name: "create_country",
      description: "Create a country with daily working hours and optional schedule rules. Admin role required. Always confirm first.",
      parameters: {
        type: "object",
        properties: {
          code: { type: "string", description: "ISO country code such as DE or ES." },
          name: { type: "string", description: "Country name." },
          dailyWorkingHours: { type: "number", description: "Standard daily working hours." },
          scheduleRules: {
            type: "object",
            description: "Optional schedule rule object such as the Spain reduced-hours configuration.",
          },
        },
        required: ["code", "name"],
      },
    },
  },
  {
    type: "function",
    function: {
      name: "update_country",
      description: "Update a country including working hours, schedule rules, or active state. Admin role required. Always confirm first.",
      parameters: {
        type: "object",
        properties: {
          id: { type: "string", description: "Country ID." },
          data: {
            type: "object",
            properties: {
              code: { type: "string" },
              name: { type: "string" },
              dailyWorkingHours: { type: "number" },
              scheduleRules: { type: ["object", "null"] },
              isActive: { type: "boolean" },
            },
          },
        },
        required: ["id", "data"],
      },
    },
  },
  {
    type: "function",
    function: {
      name: "create_metro_city",
      description: "Create a metro city for a country. Admin role required. Always confirm first.",
      parameters: {
        type: "object",
        properties: {
          countryId: { type: "string", description: "Country ID." },
          name: { type: "string", description: "Metro city name." },
        },
        required: ["countryId", "name"],
      },
    },
  },
  {
    type: "function",
    function: {
      name: "update_metro_city",
      description: "Rename a metro city. Admin role required. Always confirm first.",
      parameters: {
        type: "object",
        properties: {
          id: { type: "string", description: "Metro city ID." },
          data: {
            type: "object",
            properties: {
              name: { type: "string" },
            },
          },
        },
        required: ["id", "data"],
      },
    },
  },
  {
    type: "function",
    function: {
      name: "delete_metro_city",
      description: "Delete a metro city when no resource is assigned to it. Admin role required. Always confirm first.",
      parameters: {
        type: "object",
        properties: {
          id: { type: "string", description: "Metro city ID." },
        },
        required: ["id"],
      },
    },
  },
];

export function createCountryMetroAdminExecutors(
  deps: CountryMetroAdminDeps,
): Record<string, ToolExecutor> {
  return {
    async create_country(params: {
      code: string;
      name: string;
      dailyWorkingHours?: number;
      scheduleRules?: Prisma.JsonValue | null;
    }, ctx: ToolContext) {
      deps.assertAdminRole(ctx);
      const caller = deps.createCountryCaller(deps.createScopedCallerContext(ctx));

      let created;
      try {
        created = await caller.create(CreateCountrySchema.parse(params));
      } catch (error) {
        const mapped = deps.toAssistantCountryMutationError(error);
        if (mapped) {
          return mapped;
        }
        throw error;
      }

      return {
        __action: "invalidate" as const,
        scope: ["country", "resource", "holidayCalendar", "vacation"],
        success: true,
        country: deps.formatCountry(created),
        message: `Created country: ${created.name}`,
      };
    },

    async update_country(params: {
      id: string;
      data: {
        code?: string;
        name?: string;
        dailyWorkingHours?: number;
        scheduleRules?: Prisma.JsonValue | null;
        isActive?: boolean;
      };
    }, ctx: ToolContext) {
      deps.assertAdminRole(ctx);
      const caller = deps.createCountryCaller(deps.createScopedCallerContext(ctx));
      const input = {
        id: params.id,
        data: UpdateCountrySchema.parse(params.data),
      };

      let updated;
      try {
        updated = await caller.update(input);
      } catch (error) {
        const mapped = deps.toAssistantCountryMutationError(error);
        if (mapped) {
          return mapped;
        }
        throw error;
      }

      return {
        __action: "invalidate" as const,
        scope: ["country", "resource", "holidayCalendar", "vacation"],
        success: true,
        country: deps.formatCountry(updated),
        message: `Updated country: ${updated.name}`,
      };
    },

    async create_metro_city(params: { countryId: string; name: string }, ctx: ToolContext) {
      deps.assertAdminRole(ctx);
      const caller = deps.createCountryCaller(deps.createScopedCallerContext(ctx));

      let created;
      try {
        created = await caller.createCity(CreateMetroCitySchema.parse(params));
      } catch (error) {
        const mapped = deps.toAssistantMetroCityMutationError(error);
        if (mapped) {
          return mapped;
        }
        throw error;
      }

      return {
        __action: "invalidate" as const,
        scope: ["country", "resource", "holidayCalendar", "vacation"],
        success: true,
        metroCity: created,
        message: `Created metro city: ${created.name}`,
      };
    },

    async update_metro_city(params: { id: string; data: { name?: string } }, ctx: ToolContext) {
      deps.assertAdminRole(ctx);
      const caller = deps.createCountryCaller(deps.createScopedCallerContext(ctx));
      const input = {
        id: params.id,
        data: UpdateMetroCitySchema.parse(params.data),
      };

      let updated;
      try {
        updated = await caller.updateCity(input);
      } catch (error) {
        const mapped = deps.toAssistantMetroCityMutationError(error);
        if (mapped) {
          return mapped;
        }
        throw error;
      }

      return {
        __action: "invalidate" as const,
        scope: ["country", "resource", "holidayCalendar", "vacation"],
        success: true,
        metroCity: updated,
        message: `Updated metro city: ${updated.name}`,
      };
    },

    async delete_metro_city(params: { id: string }, ctx: ToolContext) {
      deps.assertAdminRole(ctx);
      const caller = deps.createCountryCaller(deps.createScopedCallerContext(ctx));

      let deleted;
      try {
        deleted = await caller.deleteCity({ id: params.id });
      } catch (error) {
        const mapped = deps.toAssistantMetroCityMutationError(error);
        if (mapped) {
          return mapped;
        }
        throw error;
      }

      return {
        __action: "invalidate" as const,
        scope: ["country", "resource", "holidayCalendar", "vacation"],
        success: true,
        message: `Deleted metro city: ${deleted.name ?? params.id}`,
      };
    },
  };
}