import type { AgentEvent } from "@mariozechner/pi-agent-core";
import { describe, expect, it, vi } from "vitest";
import type { MessagingToolSend } from "./pi-embedded-messaging.js";
import {
  handleToolExecutionEnd,
  handleToolExecutionStart,
} from "./pi-embedded-subscribe.handlers.tools.js";
import type {
  ToolCallSummary,
  ToolHandlerContext,
} from "./pi-embedded-subscribe.handlers.types.js";

type ToolExecutionStartEvent = Extract<AgentEvent, { type: "tool_execution_start" }>;
type ToolExecutionEndEvent = Extract<AgentEvent, { type: "tool_execution_end" }>;

function createTestContext(): {
  ctx: ToolHandlerContext;
  warn: ReturnType<typeof vi.fn>;
  onBlockReplyFlush: ReturnType<typeof vi.fn>;
} {
  const onBlockReplyFlush = vi.fn();
  const warn = vi.fn();
  const ctx: ToolHandlerContext = {
    params: {
      runId: "run-test",
      onBlockReplyFlush,
      onAgentEvent: undefined,
      onToolResult: undefined,
    },
    flushBlockReplyBuffer: vi.fn(),
    hookRunner: undefined,
    log: {
      debug: vi.fn(),
      warn,
    },
    state: {
      toolMetaById: new Map<string, ToolCallSummary>(),
      toolMetas: [],
      toolSummaryById: new Set<string>(),
      pendingMessagingTargets: new Map<string, MessagingToolSend>(),
      pendingMessagingTexts: new Map<string, string>(),
      pendingMessagingMediaUrls: new Map<string, string[]>(),
      messagingToolSentTexts: [],
      messagingToolSentTextsNormalized: [],
      messagingToolSentMediaUrls: [],
      messagingToolSentTargets: [],
      successfulCronAdds: 0,
    },
    shouldEmitToolResult: () => false,
    shouldEmitToolOutput: () => false,
    emitToolSummary: vi.fn(),
    emitToolOutput: vi.fn(),
    trimMessagingToolSent: vi.fn(),
  };

  return { ctx, warn, onBlockReplyFlush };
}

describe("handleToolExecutionStart read path checks", () => {
  it("does not warn when read tool uses file_path alias", async () => {
    const { ctx, warn, onBlockReplyFlush } = createTestContext();

    const evt: ToolExecutionStartEvent = {
      type: "tool_execution_start",
      toolName: "read",
      toolCallId: "tool-1",
      args: { file_path: "/tmp/example.txt" },
    };

    await handleToolExecutionStart(ctx, evt);

    expect(onBlockReplyFlush).toHaveBeenCalledTimes(1);
    expect(warn).not.toHaveBeenCalled();
  });

  it("warns when read tool has neither path nor file_path", async () => {
    const { ctx, warn } = createTestContext();

    const evt: ToolExecutionStartEvent = {
      type: "tool_execution_start",
      toolName: "read",
      toolCallId: "tool-2",
      args: {},
    };

    await handleToolExecutionStart(ctx, evt);

    expect(warn).toHaveBeenCalledTimes(1);
    expect(String(warn.mock.calls[0]?.[0] ?? "")).toContain("read tool called without path");
  });

  it("awaits onBlockReplyFlush before continuing tool start processing", async () => {
    const { ctx, onBlockReplyFlush } = createTestContext();
    let releaseFlush: (() => void) | undefined;
    onBlockReplyFlush.mockImplementation(
      () =>
        new Promise<void>((resolve) => {
          releaseFlush = resolve;
        }),
    );

    const evt: ToolExecutionStartEvent = {
      type: "tool_execution_start",
      toolName: "exec",
      toolCallId: "tool-await-flush",
      args: { command: "echo hi" },
    };

    const pending = handleToolExecutionStart(ctx, evt);
    // Let the async function reach the awaited flush Promise.
    await Promise.resolve();

    // If flush isn't awaited, tool metadata would already be recorded here.
    expect(ctx.state.toolMetaById.has("tool-await-flush")).toBe(false);
    expect(releaseFlush).toBeTypeOf("function");

    releaseFlush?.();
    await pending;

    expect(ctx.state.toolMetaById.has("tool-await-flush")).toBe(true);
  });
});

describe("handleToolExecutionEnd cron.add commitment tracking", () => {
  it("increments successfulCronAdds when cron add succeeds", async () => {
    const { ctx } = createTestContext();
    await handleToolExecutionStart(
      ctx as never,
      {
        type: "tool_execution_start",
        toolName: "cron",
        toolCallId: "tool-cron-1",
        args: { action: "add", job: { name: "reminder" } },
      } as never,
    );

    await handleToolExecutionEnd(
      ctx as never,
      {
        type: "tool_execution_end",
        toolName: "cron",
        toolCallId: "tool-cron-1",
        isError: false,
        result: { details: { status: "ok" } },
      } as never,
    );

    expect(ctx.state.successfulCronAdds).toBe(1);
  });

  it("does not increment successfulCronAdds when cron add fails", async () => {
    const { ctx } = createTestContext();
    await handleToolExecutionStart(
      ctx as never,
      {
        type: "tool_execution_start",
        toolName: "cron",
        toolCallId: "tool-cron-2",
        args: { action: "add", job: { name: "reminder" } },
      } as never,
    );

    await handleToolExecutionEnd(
      ctx as never,
      {
        type: "tool_execution_end",
        toolName: "cron",
        toolCallId: "tool-cron-2",
        isError: true,
        result: { details: { status: "error" } },
      } as never,
    );

    expect(ctx.state.successfulCronAdds).toBe(0);
  });
});

describe("messaging tool media URL tracking", () => {
  it("tracks media arg from messaging tool as pending", async () => {
    const { ctx } = createTestContext();

    const evt: ToolExecutionStartEvent = {
      type: "tool_execution_start",
      toolName: "message",
      toolCallId: "tool-m1",
      args: { action: "send", to: "channel:123", content: "hi", media: "file:///img.jpg" },
    };

    await handleToolExecutionStart(ctx, evt);

    expect(ctx.state.pendingMessagingMediaUrls.get("tool-m1")).toEqual(["file:///img.jpg"]);
  });

  it("commits pending media URL on tool success", async () => {
    const { ctx } = createTestContext();

    // Simulate start
    const startEvt: ToolExecutionStartEvent = {
      type: "tool_execution_start",
      toolName: "message",
      toolCallId: "tool-m2",
      args: { action: "send", to: "channel:123", content: "hi", media: "file:///img.jpg" },
    };

    await handleToolExecutionStart(ctx, startEvt);

    // Simulate successful end
    const endEvt: ToolExecutionEndEvent = {
      type: "tool_execution_end",
      toolName: "message",
      toolCallId: "tool-m2",
      isError: false,
      result: { ok: true },
    };

    await handleToolExecutionEnd(ctx, endEvt);

    expect(ctx.state.messagingToolSentMediaUrls).toContain("file:///img.jpg");
    expect(ctx.state.pendingMessagingMediaUrls.has("tool-m2")).toBe(false);
  });

  it("commits mediaUrls from tool result payload", async () => {
    const { ctx } = createTestContext();

    const startEvt: ToolExecutionStartEvent = {
      type: "tool_execution_start",
      toolName: "message",
      toolCallId: "tool-m2b",
      args: { action: "send", to: "channel:123", content: "hi" },
    };
    await handleToolExecutionStart(ctx, startEvt);

    const endEvt: ToolExecutionEndEvent = {
      type: "tool_execution_end",
      toolName: "message",
      toolCallId: "tool-m2b",
      isError: false,
      result: {
        content: [
          {
            type: "text",
            text: JSON.stringify({
              mediaUrls: ["file:///img-a.jpg", "file:///img-b.jpg"],
            }),
          },
        ],
      },
    };
    await handleToolExecutionEnd(ctx, endEvt);

    expect(ctx.state.messagingToolSentMediaUrls).toEqual([
      "file:///img-a.jpg",
      "file:///img-b.jpg",
    ]);
  });

  it("trims messagingToolSentMediaUrls to 200 on commit (FIFO)", async () => {
    const { ctx } = createTestContext();

    // Replace mock with a real trim that replicates production cap logic.
    const MAX = 200;
    ctx.trimMessagingToolSent = () => {
      if (ctx.state.messagingToolSentTexts.length > MAX) {
        const overflow = ctx.state.messagingToolSentTexts.length - MAX;
        ctx.state.messagingToolSentTexts.splice(0, overflow);
        ctx.state.messagingToolSentTextsNormalized.splice(0, overflow);
      }
      if (ctx.state.messagingToolSentTargets.length > MAX) {
        const overflow = ctx.state.messagingToolSentTargets.length - MAX;
        ctx.state.messagingToolSentTargets.splice(0, overflow);
      }
      if (ctx.state.messagingToolSentMediaUrls.length > MAX) {
        const overflow = ctx.state.messagingToolSentMediaUrls.length - MAX;
        ctx.state.messagingToolSentMediaUrls.splice(0, overflow);
      }
    };

    // Pre-fill with 200 URLs (url-0 .. url-199)
    for (let i = 0; i < 200; i++) {
      ctx.state.messagingToolSentMediaUrls.push(`file:///img-${i}.jpg`);
    }
    expect(ctx.state.messagingToolSentMediaUrls).toHaveLength(200);

    // Commit one more via start → end
    const startEvt: ToolExecutionStartEvent = {
      type: "tool_execution_start",
      toolName: "message",
      toolCallId: "tool-cap",
      args: { action: "send", to: "channel:123", content: "hi", media: "file:///img-new.jpg" },
    };
    await handleToolExecutionStart(ctx, startEvt);

    const endEvt: ToolExecutionEndEvent = {
      type: "tool_execution_end",
      toolName: "message",
      toolCallId: "tool-cap",
      isError: false,
      result: { ok: true },
    };
    await handleToolExecutionEnd(ctx, endEvt);

    // Should be capped at 200, oldest removed, newest appended.
    expect(ctx.state.messagingToolSentMediaUrls).toHaveLength(200);
    expect(ctx.state.messagingToolSentMediaUrls[0]).toBe("file:///img-1.jpg");
    expect(ctx.state.messagingToolSentMediaUrls[199]).toBe("file:///img-new.jpg");
    expect(ctx.state.messagingToolSentMediaUrls).not.toContain("file:///img-0.jpg");
  });

  it("discards pending media URL on tool error", async () => {
    const { ctx } = createTestContext();

    const startEvt: ToolExecutionStartEvent = {
      type: "tool_execution_start",
      toolName: "message",
      toolCallId: "tool-m3",
      args: { action: "send", to: "channel:123", content: "hi", media: "file:///img.jpg" },
    };

    await handleToolExecutionStart(ctx, startEvt);

    const endEvt: ToolExecutionEndEvent = {
      type: "tool_execution_end",
      toolName: "message",
      toolCallId: "tool-m3",
      isError: true,
      result: "Error: failed",
    };

    await handleToolExecutionEnd(ctx, endEvt);

    expect(ctx.state.messagingToolSentMediaUrls).toHaveLength(0);
    expect(ctx.state.pendingMessagingMediaUrls.has("tool-m3")).toBe(false);
  });
});
