import { TRPCError } from "@trpc/server";
import { and, asc, eq } from "drizzle-orm";
import { z } from "zod";

import { connectedRepos } from "@tasks/database/schema";
import {
  connectedRepoSchema,
  forgeTypeSchema,
  parseGitRemoteUrl,
  type ConnectedRepo,
} from "@tasks/shared/connected-repos";

import { getForgeAdapter } from "@/server/lib/forge/adapters";
import { router, workspaceProcedure } from "@/server/trpc";
import type { WorkspaceProcedureContext } from "@/server/trpc";

type RepoRow = typeof connectedRepos.$inferSelect;

function assertWorkspaceAdmin(ctx: WorkspaceProcedureContext): void {
  if (ctx.workspace.role !== "owner" && ctx.workspace.role !== "admin") {
    throw new TRPCError({
      code: "FORBIDDEN",
      message: "Only workspace owners and admins can manage connected repos.",
    });
  }
}

function canManageWorkspace(ctx: WorkspaceProcedureContext): boolean {
  return ctx.workspace.role === "owner" || ctx.workspace.role === "admin";
}

function readToken(envVarName: string | null | undefined): string | undefined {
  if (!envVarName?.trim()) {
    return undefined;
  }
  return process.env[envVarName]?.trim() || undefined;
}

function mapRepoRow(row: RepoRow): ConnectedRepo {
  return connectedRepoSchema.parse({
    id: row.id,
    workspaceId: row.workspaceId,
    displayName: row.displayName,
    gitRemoteUrl: row.gitRemoteUrl,
    forgeType: row.forgeType,
    apiBaseUrl: row.apiBaseUrl,
    owner: row.owner,
    repoName: row.repoName,
    defaultBranch: row.defaultBranch,
    tokenEnvVar: row.tokenEnvVar,
    metadata: row.metadata,
    createdAt: row.createdAt,
    updatedAt: row.updatedAt,
  });
}

const connectInputSchema = z.object({
  workspace: z.string().min(1),
  remoteUrl: z.string().min(1),
  displayName: z.string().min(1).max(200).optional(),
  tokenEnvVar: z.string().min(1).max(120).nullable().optional(),
  forgeType: forgeTypeSchema.optional(),
});

export const connectedReposRouter = router({
  list: workspaceProcedure.query(async ({ ctx }) => {
    const rows = await ctx.db
      .select()
      .from(connectedRepos)
      .where(eq(connectedRepos.workspaceId, ctx.workspace.id))
      .orderBy(asc(connectedRepos.displayName));

    return {
      repos: rows.map(mapRepoRow),
      canManage: canManageWorkspace(ctx),
    };
  }),

  parseRemote: workspaceProcedure
    .input(
      z.object({
        workspace: z.string().min(1),
        remoteUrl: z.string().min(1),
      }),
    )
    .mutation(({ ctx, input }) => {
      assertWorkspaceAdmin(ctx);
      try {
        return parseGitRemoteUrl(input.remoteUrl);
      } catch (error) {
        throw new TRPCError({
          code: "BAD_REQUEST",
          message: error instanceof Error ? error.message : "Invalid remote URL.",
        });
      }
    }),

  connect: workspaceProcedure.input(connectInputSchema).mutation(async ({ ctx, input }) => {
    assertWorkspaceAdmin(ctx);

    let parsed;
    try {
      parsed = parseGitRemoteUrl(input.remoteUrl);
    } catch (error) {
      throw new TRPCError({
        code: "BAD_REQUEST",
        message: error instanceof Error ? error.message : "Invalid remote URL.",
      });
    }

    const forgeType = input.forgeType ?? parsed.forgeType;
    const displayName =
      input.displayName?.trim() ||
      `${parsed.owner}/${parsed.repoName}`;

    const [row] = await ctx.db
      .insert(connectedRepos)
      .values({
        workspaceId: ctx.workspace.id,
        displayName,
        gitRemoteUrl: parsed.gitRemoteUrl,
        forgeType,
        apiBaseUrl: parsed.apiBaseUrl,
        owner: parsed.owner,
        repoName: parsed.repoName,
        tokenEnvVar: input.tokenEnvVar ?? null,
        updatedAt: new Date(),
      })
      .returning();

    if (!row) {
      throw new TRPCError({
        code: "INTERNAL_SERVER_ERROR",
        message: "Failed to create connected repo.",
      });
    }

    return mapRepoRow(row);
  }),

  update: workspaceProcedure
    .input(
      z.object({
        workspace: z.string().min(1),
        repoId: z.string().uuid(),
        displayName: z.string().min(1).max(200).optional(),
        tokenEnvVar: z.string().min(1).max(120).nullable().optional(),
      }),
    )
    .mutation(async ({ ctx, input }) => {
      assertWorkspaceAdmin(ctx);

      const [row] = await ctx.db
        .update(connectedRepos)
        .set({
          ...(input.displayName !== undefined ? { displayName: input.displayName } : {}),
          ...(input.tokenEnvVar !== undefined ? { tokenEnvVar: input.tokenEnvVar } : {}),
          updatedAt: new Date(),
        })
        .where(
          and(
            eq(connectedRepos.id, input.repoId),
            eq(connectedRepos.workspaceId, ctx.workspace.id),
          ),
        )
        .returning();

      if (!row) {
        throw new TRPCError({ code: "NOT_FOUND", message: "Connected repo not found." });
      }

      return mapRepoRow(row);
    }),

  disconnect: workspaceProcedure
    .input(
      z.object({
        workspace: z.string().min(1),
        repoId: z.string().uuid(),
      }),
    )
    .mutation(async ({ ctx, input }) => {
      assertWorkspaceAdmin(ctx);

      const [row] = await ctx.db
        .delete(connectedRepos)
        .where(
          and(
            eq(connectedRepos.id, input.repoId),
            eq(connectedRepos.workspaceId, ctx.workspace.id),
          ),
        )
        .returning({ id: connectedRepos.id });

      if (!row) {
        throw new TRPCError({ code: "NOT_FOUND", message: "Connected repo not found." });
      }

      return { ok: true as const };
    }),

  testConnection: workspaceProcedure
    .input(
      z.object({
        workspace: z.string().min(1),
        repoId: z.string().uuid(),
      }),
    )
    .mutation(async ({ ctx, input }) => {
      assertWorkspaceAdmin(ctx);

      const [row] = await ctx.db
        .select()
        .from(connectedRepos)
        .where(
          and(
            eq(connectedRepos.id, input.repoId),
            eq(connectedRepos.workspaceId, ctx.workspace.id),
          ),
        )
        .limit(1);

      if (!row) {
        throw new TRPCError({ code: "NOT_FOUND", message: "Connected repo not found." });
      }

      const started = Date.now();
      const adapter = getForgeAdapter(forgeTypeSchema.parse(row.forgeType));
      const token = readToken(row.tokenEnvVar);

      try {
        const metadata = await adapter.fetchRepoMetadata({
          apiBaseUrl: row.apiBaseUrl,
          owner: row.owner,
          repo: row.repoName,
          token,
        });

        await ctx.db
          .update(connectedRepos)
          .set({
            defaultBranch: metadata.defaultBranch,
            metadata: {
              ...(row.metadata ?? {}),
              cloneUrl: metadata.cloneUrl,
              description: metadata.description ?? null,
              lastTestedAt: new Date().toISOString(),
            },
            updatedAt: new Date(),
          })
          .where(
            and(
              eq(connectedRepos.id, row.id),
              eq(connectedRepos.workspaceId, ctx.workspace.id),
            ),
          );

        return {
          ok: true as const,
          latencyMs: Date.now() - started,
          defaultBranch: metadata.defaultBranch,
          cloneUrl: metadata.cloneUrl,
        };
      } catch (error) {
        return {
          ok: false as const,
          latencyMs: Date.now() - started,
          error: error instanceof Error ? error.message : "Connection test failed.",
        };
      }
    }),
});