import {
  countPlanningEntries,
  listAssignmentBookings,
} from "@planarchy/application";
import { BlueprintTarget, CreateProjectSchema, FieldType, PermissionKey, ProjectStatus, UpdateProjectSchema } from "@planarchy/shared";
import { TRPCError } from "@trpc/server";
import { z } from "zod";
import { findUniqueOrThrow } from "../db/helpers.js";
import { paginate, paginateCursor, PaginationInputSchema, CursorInputSchema } from "../db/pagination.js";
import { assertBlueprintDynamicFields } from "./blueprint-validation.js";
import { buildDynamicFieldWhereClauses } from "./custom-field-filters.js";
import { loadProjectPlanningReadModel } from "./project-planning-read-model.js";
import { adminProcedure, controllerProcedure, createTRPCRouter, managerProcedure, protectedProcedure, requirePermission } from "../trpc.js";
import { createDalleClient, isDalleConfigured, parseAiError } from "../ai-client.js";
import { invalidateDashboardCache } from "../lib/cache.js";
import { dispatchWebhooks } from "../lib/webhook-dispatcher.js";

const MAX_COVER_SIZE = 4 * 1024 * 1024; // 4 MB base64 string length limit (client compresses before upload)

export const projectRouter = createTRPCRouter({
  list: protectedProcedure
    .input(
      PaginationInputSchema.extend({
        status: z.nativeEnum(ProjectStatus).optional(),
        search: z.string().optional(),
        // Custom field JSONB filters
        customFieldFilters: z.array(z.object({
          key: z.string(),
          value: z.string(),
          type: z.nativeEnum(FieldType),
        })).optional(),
      }),
    )
    .query(async ({ ctx, input }) => {
      const { status, search, cursor, customFieldFilters } = input;

      const cfConditions = buildDynamicFieldWhereClauses(customFieldFilters).map((dynamicFields) => ({ dynamicFields }));

      // eslint-disable-next-line @typescript-eslint/no-explicit-any
      const where: any = {
        ...(status ? { status } : {}),
        ...(search
          ? {
              OR: [
                { name: { contains: search, mode: "insensitive" as const } },
                { shortCode: { contains: search, mode: "insensitive" as const } },
              ],
            }
          : {}),
        ...(cfConditions.length > 0 ? { AND: cfConditions } : {}),
      };

      const whereWithCursor = cursor ? { ...where, id: { gt: cursor } } : where;

      const result = await paginate(
        ({ skip, take }) =>
          ctx.db.project.findMany({
            where: whereWithCursor,
            skip,
            take,
            orderBy: [{ startDate: "asc" }, { id: "asc" }],
          }),
        () => ctx.db.project.count({ where }),
        input,
      );

      const { countsByProjectId } = await countPlanningEntries(ctx.db, {
        projectIds: result.items.map((project) => project.id),
      });

      return {
        projects: result.items.map((project) => ({
          ...project,
          _count: {
            allocations: countsByProjectId.get(project.id) ?? 0,
          },
        })),
        total: result.total,
        page: result.page,
        limit: result.limit,
        nextCursor: result.nextCursor,
      };
    }),

  getById: protectedProcedure
    .input(z.object({ id: z.string() }))
    .query(async ({ ctx, input }) => {
      const [project, planningRead] = await Promise.all([
        ctx.db.project.findUnique({
          where: { id: input.id },
          include: { blueprint: true },
        }),
        loadProjectPlanningReadModel(ctx.db, { projectId: input.id }),
      ]);

      if (!project) {
        throw new TRPCError({ code: "NOT_FOUND", message: "Project not found" });
      }

      return {
        ...project,
        allocations: planningRead.readModel.assignments,
        demands: planningRead.readModel.demands,
        assignments: planningRead.readModel.assignments,
      };
    }),

  create: managerProcedure
    .input(CreateProjectSchema)
    .mutation(async ({ ctx, input }) => {
      requirePermission(ctx, PermissionKey.MANAGE_PROJECTS);
      const existing = await ctx.db.project.findUnique({
        where: { shortCode: input.shortCode },
      });

      if (existing) {
        throw new TRPCError({
          code: "CONFLICT",
          message: `Project with short code "${input.shortCode}" already exists`,
        });
      }

      await assertBlueprintDynamicFields({
        db: ctx.db,
        blueprintId: input.blueprintId,
        dynamicFields: input.dynamicFields,
        target: BlueprintTarget.PROJECT,
      });

      const project = await ctx.db.project.create({
        data: {
          shortCode: input.shortCode,
          name: input.name,
          orderType: input.orderType,
          allocationType: input.allocationType,
          winProbability: input.winProbability,
          budgetCents: input.budgetCents,
          startDate: input.startDate,
          endDate: input.endDate,
          status: input.status,
          responsiblePerson: input.responsiblePerson,
          ...(input.color !== undefined ? { color: input.color } : {}),
          staffingReqs: input.staffingReqs as unknown as import("@planarchy/db").Prisma.InputJsonValue,
          dynamicFields: input.dynamicFields as unknown as import("@planarchy/db").Prisma.InputJsonValue,
          blueprintId: input.blueprintId,
          ...(input.utilizationCategoryId !== undefined ? { utilizationCategoryId: input.utilizationCategoryId || null } : {}),
          ...(input.clientId !== undefined ? { clientId: input.clientId || null } : {}),
        } as unknown as Parameters<typeof ctx.db.project.create>[0]["data"],
      });

      await ctx.db.auditLog.create({
        data: {
          entityType: "Project",
          entityId: project.id,
          action: "CREATE",
          changes: { after: project },
        },
      });

      void invalidateDashboardCache();
      void dispatchWebhooks(ctx.db, "project.created", {
        id: project.id,
        shortCode: project.shortCode,
        name: project.name,
        status: project.status,
      });
      return project;
    }),

  update: managerProcedure
    .input(z.object({ id: z.string(), data: UpdateProjectSchema }))
    .mutation(async ({ ctx, input }) => {
      requirePermission(ctx, PermissionKey.MANAGE_PROJECTS);
      const existing = await findUniqueOrThrow(
        ctx.db.project.findUnique({ where: { id: input.id } }),
        "Project",
      );

      const nextBlueprintId = input.data.blueprintId ?? existing.blueprintId ?? undefined;
      const nextDynamicFields = (input.data.dynamicFields ?? existing.dynamicFields ?? {}) as Record<string, unknown>;

      await assertBlueprintDynamicFields({
        db: ctx.db,
        blueprintId: nextBlueprintId,
        dynamicFields: nextDynamicFields,
        target: BlueprintTarget.PROJECT,
      });

      const updated = await ctx.db.project.update({
        where: { id: input.id },
        data: {
          ...(input.data.name !== undefined ? { name: input.data.name } : {}),
          ...(input.data.orderType !== undefined ? { orderType: input.data.orderType } : {}),
          ...(input.data.allocationType !== undefined ? { allocationType: input.data.allocationType } : {}),
          ...(input.data.winProbability !== undefined ? { winProbability: input.data.winProbability } : {}),
          ...(input.data.budgetCents !== undefined ? { budgetCents: input.data.budgetCents } : {}),
          ...(input.data.startDate !== undefined ? { startDate: input.data.startDate } : {}),
          ...(input.data.endDate !== undefined ? { endDate: input.data.endDate } : {}),
          ...(input.data.status !== undefined ? { status: input.data.status } : {}),
          ...(input.data.responsiblePerson !== undefined ? { responsiblePerson: input.data.responsiblePerson } : {}),
          ...(input.data.color !== undefined ? { color: input.data.color } : {}),
          ...(input.data.staffingReqs !== undefined ? { staffingReqs: input.data.staffingReqs as unknown as import("@planarchy/db").Prisma.InputJsonValue } : {}),
          ...(input.data.dynamicFields !== undefined ? { dynamicFields: input.data.dynamicFields as unknown as import("@planarchy/db").Prisma.InputJsonValue } : {}),
          ...(input.data.blueprintId !== undefined ? { blueprintId: input.data.blueprintId } : {}),
          ...(input.data.utilizationCategoryId !== undefined ? { utilizationCategoryId: input.data.utilizationCategoryId || null } : {}),
          ...(input.data.clientId !== undefined ? { clientId: input.data.clientId || null } : {}),
        } as unknown as Parameters<typeof ctx.db.project.update>[0]["data"],
      });

      await ctx.db.auditLog.create({
        data: {
          entityType: "Project",
          entityId: input.id,
          action: "UPDATE",
          changes: { before: existing, after: updated },
        },
      });

      void invalidateDashboardCache();
      return updated;
    }),

  updateStatus: managerProcedure
    .input(z.object({ id: z.string(), status: z.nativeEnum(ProjectStatus) }))
    .mutation(async ({ ctx, input }) => {
      requirePermission(ctx, PermissionKey.MANAGE_PROJECTS);
      const result = await ctx.db.project.update({
        where: { id: input.id },
        data: { status: input.status },
      });
      void invalidateDashboardCache();
      void dispatchWebhooks(ctx.db, "project.status_changed", {
        id: result.id,
        shortCode: result.shortCode,
        name: result.name,
        status: result.status,
      });
      return result;
    }),

  batchUpdateStatus: managerProcedure
    .input(
      z.object({
        ids: z.array(z.string()).min(1).max(100),
        status: z.nativeEnum(ProjectStatus),
      }),
    )
    .mutation(async ({ ctx, input }) => {
      requirePermission(ctx, PermissionKey.MANAGE_PROJECTS);
      const updated = await ctx.db.$transaction(
        input.ids.map((id) =>
          ctx.db.project.update({ where: { id }, data: { status: input.status } }),
        ),
      );

      await ctx.db.auditLog.create({
        data: {
          entityType: "Project",
          entityId: input.ids.join(","),
          action: "UPDATE",
          changes: { after: { status: input.status, ids: input.ids } },
        },
      });

      void invalidateDashboardCache();
      return { count: updated.length };
    }),

  listWithCosts: controllerProcedure
    .input(
      CursorInputSchema.extend({
        status: z.nativeEnum(ProjectStatus).optional(),
        search: z.string().optional(),
      }),
    )
    .query(async ({ ctx, input }) => {
      const { status, search, cursor } = input;
      const where = {
        ...(status ? { status } : {}),
        ...(search
          ? {
              OR: [
                { name: { contains: search, mode: "insensitive" as const } },
                { shortCode: { contains: search, mode: "insensitive" as const } },
              ],
            }
          : {}),
      };
      const whereWithCursor = cursor ? { ...where, id: { gt: cursor } } : where;

      const result = await paginateCursor(
        ({ take }) =>
          ctx.db.project.findMany({
            where: whereWithCursor,
            take,
            orderBy: [{ startDate: "asc" }, { id: "asc" }],
          }),
        input,
      );

      const projectIds = result.items.map((project) => project.id);
      const bookings = projectIds.length
        ? await listAssignmentBookings(ctx.db, {
            startDate: new Date("1900-01-01T00:00:00.000Z"),
            endDate: new Date("2100-12-31T23:59:59.999Z"),
            projectIds,
          })
        : [];

      // Compute cost + person days per project
      const projects = result.items.map((p) => {
        const projectBookings = bookings.filter((booking) => booking.projectId === p.id);
        let totalCostCents = 0;
        let totalPersonDays = 0;
        for (const a of projectBookings) {
          const days =
            (new Date(a.endDate).getTime() - new Date(a.startDate).getTime()) /
              (1000 * 60 * 60 * 24) +
            1;
          totalCostCents += a.dailyCostCents * days;
          totalPersonDays += (a.hoursPerDay * days) / 8;
        }
        const utilizationPercent = p.budgetCents > 0
          ? Math.round((totalCostCents / p.budgetCents) * 100)
          : 0;
        return {
          ...p,
          totalCostCents: Math.round(totalCostCents),
          totalPersonDays: Math.round(totalPersonDays * 10) / 10,
          utilizationPercent,
        };
      });

      return { projects, nextCursor: result.nextCursor };
    }),

  delete: adminProcedure
    .input(z.object({ id: z.string() }))
    .mutation(async ({ ctx, input }) => {
      const project = await ctx.db.project.findUnique({
        where: { id: input.id },
        select: { id: true, name: true, shortCode: true },
      });
      if (!project) throw new TRPCError({ code: "NOT_FOUND", message: "Project not found" });

      // Delete all related records in a transaction
      await ctx.db.$transaction(async (tx) => {
        // Delete assignments (which reference demandRequirements)
        await tx.assignment.deleteMany({ where: { projectId: input.id } });
        // Delete demand requirements
        await tx.demandRequirement.deleteMany({ where: { projectId: input.id } });
        // Unlink calculation rules
        await tx.calculationRule.updateMany({
          where: { projectId: input.id },
          data: { projectId: null },
        });
        // Delete the project
        await tx.project.delete({ where: { id: input.id } });
        // Audit log
        await tx.auditLog.create({
          data: {
            entityType: "Project",
            entityId: input.id,
            action: "DELETE",
            ...(ctx.dbUser?.id ? { userId: ctx.dbUser.id } : {}),
            changes: { before: { id: project.id, name: project.name, shortCode: project.shortCode } } as never,
          },
        });
      });

      void invalidateDashboardCache();
      return { id: input.id, name: project.name };
    }),

  batchDelete: adminProcedure
    .input(
      z.object({
        ids: z.array(z.string()).min(1).max(50),
      }),
    )
    .mutation(async ({ ctx, input }) => {
      const projects = await ctx.db.project.findMany({
        where: { id: { in: input.ids } },
        select: { id: true, name: true, shortCode: true },
      });

      if (projects.length === 0) {
        throw new TRPCError({ code: "NOT_FOUND", message: "No projects found" });
      }

      await ctx.db.$transaction(async (tx) => {
        const ids = projects.map((p) => p.id);
        await tx.assignment.deleteMany({ where: { projectId: { in: ids } } });
        await tx.demandRequirement.deleteMany({ where: { projectId: { in: ids } } });
        await tx.calculationRule.updateMany({
          where: { projectId: { in: ids } },
          data: { projectId: null },
        });
        await tx.project.deleteMany({ where: { id: { in: ids } } });
        await tx.auditLog.create({
          data: {
            entityType: "Project",
            entityId: ids.join(","),
            action: "DELETE",
            ...(ctx.dbUser?.id ? { userId: ctx.dbUser.id } : {}),
            changes: { before: projects } as never,
          },
        });
      });

      void invalidateDashboardCache();
      return { count: projects.length };
    }),

  // ─── Cover Art ──────────────────────────────────────────────────────────────

  generateCover: managerProcedure
    .input(z.object({
      projectId: z.string(),
      prompt: z.string().max(500).optional(),
    }))
    .mutation(async ({ ctx, input }) => {
      requirePermission(ctx, PermissionKey.MANAGE_PROJECTS);

      const project = await findUniqueOrThrow(
        ctx.db.project.findUnique({
          where: { id: input.projectId },
          include: { client: { select: { name: true } } },
        }),
        "Project",
      );

      const settings = await ctx.db.systemSettings.findUnique({
        where: { id: "singleton" },
      });

      if (!isDalleConfigured(settings)) {
        throw new TRPCError({
          code: "PRECONDITION_FAILED",
          message: "DALL-E is not configured. Set up the DALL-E deployment in Admin → Settings.",
        });
      }

      const clientName = project.client?.name ? ` for ${project.client.name}` : "";
      const basePrompt = `Professional cover art for a 3D automotive visualization project: "${project.name}"${clientName}. Style: cinematic, modern, photorealistic CGI rendering, dramatic lighting, studio environment. No text or typography in the image.`;
      const finalPrompt = input.prompt
        ? `${basePrompt} Additional direction: ${input.prompt}`
        : basePrompt;

      const dalleClient = createDalleClient(settings!);
      const model = settings!.aiProvider === "azure" ? settings!.azureDalleDeployment! : "dall-e-3";

      // eslint-disable-next-line @typescript-eslint/no-explicit-any
      let response: any;
      try {
        response = await dalleClient.images.generate({
          model,
          prompt: finalPrompt,
          size: "1024x1024",
          n: 1,
          response_format: "b64_json",
        });
      } catch (err) {
        throw new TRPCError({
          code: "INTERNAL_SERVER_ERROR",
          message: `DALL-E error: ${parseAiError(err)}`,
        });
      }

      const b64 = response.data?.[0]?.b64_json;
      if (!b64) {
        throw new TRPCError({
          code: "INTERNAL_SERVER_ERROR",
          message: "No image data returned from DALL-E",
        });
      }

      const coverImageUrl = `data:image/png;base64,${b64}`;

      await ctx.db.project.update({
        where: { id: input.projectId },
        data: { coverImageUrl },
      });

      return { coverImageUrl };
    }),

  uploadCover: managerProcedure
    .input(z.object({
      projectId: z.string(),
      imageDataUrl: z.string(),
    }))
    .mutation(async ({ ctx, input }) => {
      requirePermission(ctx, PermissionKey.MANAGE_PROJECTS);

      if (!input.imageDataUrl.startsWith("data:image/")) {
        throw new TRPCError({
          code: "BAD_REQUEST",
          message: "Invalid image format. Must be a data URL starting with 'data:image/'.",
        });
      }

      if (input.imageDataUrl.length > MAX_COVER_SIZE) {
        throw new TRPCError({
          code: "BAD_REQUEST",
          message: "Image too large. Maximum compressed size is 4 MB.",
        });
      }

      await findUniqueOrThrow(
        ctx.db.project.findUnique({ where: { id: input.projectId } }),
        "Project",
      );

      await ctx.db.project.update({
        where: { id: input.projectId },
        data: { coverImageUrl: input.imageDataUrl },
      });

      return { coverImageUrl: input.imageDataUrl };
    }),

  removeCover: managerProcedure
    .input(z.object({ projectId: z.string() }))
    .mutation(async ({ ctx, input }) => {
      requirePermission(ctx, PermissionKey.MANAGE_PROJECTS);

      await findUniqueOrThrow(
        ctx.db.project.findUnique({ where: { id: input.projectId } }),
        "Project",
      );

      await ctx.db.project.update({
        where: { id: input.projectId },
        data: { coverImageUrl: null },
      });

      return { ok: true };
    }),

  updateCoverFocus: managerProcedure
    .input(z.object({
      projectId: z.string(),
      coverFocusY: z.number().int().min(0).max(100),
    }))
    .mutation(async ({ ctx, input }) => {
      requirePermission(ctx, PermissionKey.MANAGE_PROJECTS);
      await ctx.db.project.update({
        where: { id: input.projectId },
        data: { coverFocusY: input.coverFocusY },
      });
      return { ok: true };
    }),

  isDalleConfigured: protectedProcedure
    .query(async ({ ctx }) => {
      const settings = await ctx.db.systemSettings.findUnique({
        where: { id: "singleton" },
      });
      return { configured: isDalleConfigured(settings) };
    }),
});