/**
 * Tests for template matching.
 */

import { describe, it, expect, beforeEach, vi } from "vitest";
import type { App, TFile } from "obsidian";
import { matchTemplates } from "../../analysis/templateMatching";
import type { ChainTemplatesConfig, ChainRolesConfig } from "../../dictionary/types";
import type { IndexedEdge } from "../../analysis/graphIndex";
import type { EdgeVocabulary } from "../../vocab/types";

describe("templateMatching", () => {
  let mockApp: App;
  let mockChainRoles: ChainRolesConfig;
  let mockEdgeVocabulary: EdgeVocabulary | null;

  beforeEach(() => {
    // Mock App
    mockApp = {
      vault: {
        getAbstractFileByPath: vi.fn(),
        cachedRead: vi.fn(),
      },
      metadataCache: {
        getFileCache: vi.fn(),
        getFirstLinkpathDest: vi.fn(),
      },
    } as any;

    // Mock Chain Roles
    mockChainRoles = {
      roles: {
        causal: {
          edge_types: ["causes", "caused_by", "resulted_in"],
        },
        influences: {
          edge_types: ["influences", "influenced_by", "wirkt_auf"],
        },
        structural: {
          edge_types: ["part_of", "contains"],
        },
      },
    };

    mockEdgeVocabulary = null;
  });

  it("should match template with rich format and all slots filled (including 1-hop outgoing neighbors)", async () => {
    const templatesConfig: ChainTemplatesConfig = {
      templates: [
        {
          name: "trigger_transformation_outcome",
          description: "Test template",
          slots: [
            { id: "trigger", allowed_node_types: ["experience"] },
            { id: "transformation", allowed_node_types: ["insight"] },
            { id: "outcome", allowed_node_types: ["decision"] },
          ],
          links: [
            {
              from: "trigger",
              to: "transformation",
              allowed_edge_roles: ["causal", "influences"],
            },
            {
              from: "transformation",
              to: "outcome",
              allowed_edge_roles: ["causal"],
            },
          ],
        },
      ],
    };

    // Mock edges: A -> B -> C
    // A is current context, B is outgoing neighbor, C is 1-hop from B
    const allEdges: IndexedEdge[] = [
      {
        rawEdgeType: "wirkt_auf",
        source: { file: "Tests/01_experience_trigger.md", sectionHeading: "Kontext" },
        target: { file: "03_insight_transformation", heading: "Kern" },
        scope: "section",
        evidence: {
          file: "Tests/01_experience_trigger.md",
          sectionHeading: "Kontext",
          lineRange: { start: 5, end: 6 },
        },
      },
      {
        rawEdgeType: "resulted_in",
        source: { file: "Tests/03_insight_transformation.md", sectionHeading: "Kern" },
        target: { file: "04_decision_outcome", heading: "Entscheidung" },
        scope: "section",
        evidence: {
          file: "Tests/03_insight_transformation.md",
          sectionHeading: "Kern",
          lineRange: { start: 3, end: 4 },
        },
      },
    ];

    // Mock metadataCache for link resolution (basename -> full path)
    // Note: buildCandidateNodes resolves from currentContext.file, not from edge source
    (mockApp.metadataCache.getFirstLinkpathDest as any) = vi.fn((link: string, source: string) => {
      if (link === "03_insight_transformation" && source === "Tests/01_experience_trigger.md") {
        return { path: "Tests/03_insight_transformation.md", extension: "md" } as TFile;
      }
      if (link === "04_decision_outcome") {
        // Can be resolved from any source in Tests/ folder
        if (source.startsWith("Tests/")) {
          return { path: "Tests/04_decision_outcome.md", extension: "md" } as TFile;
        }
      }
      return null;
    });

    // Mock file reads
    (mockApp.vault.getAbstractFileByPath as any).mockImplementation((path: string) => {
      if (path === "Tests/01_experience_trigger.md" || 
          path === "Tests/03_insight_transformation.md" || 
          path === "Tests/04_decision_outcome.md") {
        return { extension: "md", path } as TFile;
      }
      return null;
    });

    (mockApp.vault.cachedRead as any).mockImplementation((file: TFile) => {
      if (file.path === "Tests/01_experience_trigger.md") {
        return Promise.resolve(`---
type: experience
---

## Kontext
`);
      }
      if (file.path === "Tests/03_insight_transformation.md") {
        return Promise.resolve(`---
type: insight
---

## Kern
`);
      }
      if (file.path === "Tests/04_decision_outcome.md") {
        return Promise.resolve(`---
type: decision
---

## Entscheidung
`);
      }
      return Promise.resolve(`---
type: unknown
---
`);
    });

    const matches = await matchTemplates(
      mockApp,
      { file: "Tests/01_experience_trigger.md", heading: "Kontext" },
      allEdges,
      templatesConfig,
      mockChainRoles,
      mockEdgeVocabulary,
      { includeNoteLinks: true, includeCandidates: false }
    );

    expect(matches.length).toBeGreaterThan(0);
    const match = matches[0];
    expect(match?.templateName).toBe("trigger_transformation_outcome");
    expect(match?.missingSlots).toEqual([]);
    expect(match?.slotAssignments["trigger"]?.file).toBe("Tests/01_experience_trigger.md");
    expect(match?.slotAssignments["transformation"]?.file).toBe("Tests/03_insight_transformation.md");
    expect(match?.slotAssignments["outcome"]?.file).toBe("Tests/04_decision_outcome.md");
    expect(match?.satisfiedLinks).toBe(2);
    expect(match?.requiredLinks).toBe(2);
  });

  it("should detect missing slot when edge is missing", async () => {
    const templatesConfig: ChainTemplatesConfig = {
      templates: [
        {
          name: "trigger_transformation_outcome",
          slots: [
            { id: "trigger", allowed_node_types: ["experience"] },
            { id: "transformation", allowed_node_types: ["insight"] },
            { id: "outcome", allowed_node_types: ["decision"] },
          ],
          links: [
            {
              from: "trigger",
              to: "transformation",
              allowed_edge_roles: ["causal"],
            },
            {
              from: "transformation",
              to: "outcome",
              allowed_edge_roles: ["causal"],
            },
          ],
        },
      ],
    };

    // Mock edges: A -> B (missing B -> C)
    const allEdges: IndexedEdge[] = [
      {
        rawEdgeType: "causes",
        source: { file: "NoteA.md", sectionHeading: "Kontext" },
        target: { file: "NoteB.md", heading: null },
        scope: "section",
        evidence: {
          file: "NoteA.md",
          sectionHeading: "Kontext",
          lineRange: { start: 5, end: 6 },
        },
      },
    ];

    // Mock metadataCache for link resolution
    (mockApp.metadataCache.getFirstLinkpathDest as any) = vi.fn((link: string, source: string) => {
      if (link === "03_insight_transformation" && source === "Tests/01_experience_trigger.md") {
        return { path: "Tests/03_insight_transformation.md", extension: "md" } as TFile;
      }
      return null;
    });

    (mockApp.vault.getAbstractFileByPath as any).mockImplementation((path: string) => {
      if (path === "Tests/01_experience_trigger.md" || path === "Tests/03_insight_transformation.md") {
        return { extension: "md", path } as TFile;
      }
      return null;
    });

    (mockApp.vault.cachedRead as any).mockImplementation((file: TFile) => {
      if (file.path === "Tests/01_experience_trigger.md") {
        return Promise.resolve(`---
type: experience
---

## Kontext
`);
      }
      if (file.path === "Tests/03_insight_transformation.md") {
        return Promise.resolve(`---
type: insight
---
`);
      }
      return Promise.resolve(`---
type: unknown
---
`);
    });

    const matches = await matchTemplates(
      mockApp,
      { file: "Tests/01_experience_trigger.md", heading: "Kontext" },
      allEdges,
      templatesConfig,
      mockChainRoles,
      mockEdgeVocabulary,
      { includeNoteLinks: true, includeCandidates: false }
    );

    expect(matches.length).toBeGreaterThan(0);
    const match = matches[0];
    expect(match?.templateName).toBe("trigger_transformation_outcome");
    // Should have missing slots (outcome slot cannot be filled)
    expect(match?.missingSlots.length).toBeGreaterThan(0);
  });

  it("should produce deterministic results regardless of edge order", async () => {
    const templatesConfig: ChainTemplatesConfig = {
      templates: [
        {
          name: "simple_chain",
          slots: [
            { id: "start", allowed_node_types: ["experience"] },
            { id: "end", allowed_node_types: ["decision"] },
          ],
          links: [
            {
              from: "start",
              to: "end",
              allowed_edge_roles: ["causal"],
            },
          ],
        },
      ],
    };

    // Create edges in different orders
    const edges1: IndexedEdge[] = [
      {
        rawEdgeType: "causes",
        source: { file: "Tests/01_experience_trigger.md", sectionHeading: "Kontext" },
        target: { file: "02_decision_outcome", heading: null },
        scope: "section",
        evidence: {
          file: "Tests/01_experience_trigger.md",
          sectionHeading: "Kontext",
          lineRange: { start: 5, end: 6 },
        },
      },
    ];

    const edges2: IndexedEdge[] = [
      {
        rawEdgeType: "causes",
        source: { file: "Tests/01_experience_trigger.md", sectionHeading: "Kontext" },
        target: { file: "02_decision_outcome", heading: null },
        scope: "section",
        evidence: {
          file: "Tests/01_experience_trigger.md",
          sectionHeading: "Kontext",
          lineRange: { start: 5, end: 6 },
        },
      },
    ];

    // Mock metadataCache for link resolution
    (mockApp.metadataCache.getFirstLinkpathDest as any) = vi.fn((link: string, source: string) => {
      if (link === "02_decision_outcome" && source === "Tests/01_experience_trigger.md") {
        return { path: "Tests/02_decision_outcome.md", extension: "md" } as TFile;
      }
      return null;
    });

    (mockApp.vault.getAbstractFileByPath as any).mockImplementation((path: string) => {
      if (path === "Tests/01_experience_trigger.md" || path === "Tests/02_decision_outcome.md") {
        return { extension: "md", path } as TFile;
      }
      return null;
    });

    (mockApp.vault.cachedRead as any).mockImplementation((file: TFile) => {
      if (file.path === "Tests/01_experience_trigger.md") {
        return Promise.resolve(`---
type: experience
---

## Kontext
`);
      }
      if (file.path === "Tests/02_decision_outcome.md") {
        return Promise.resolve(`---
type: decision
---
`);
      }
      return Promise.resolve(`---
type: unknown
---
`);
    });

    const matches1 = await matchTemplates(
      mockApp,
      { file: "Tests/01_experience_trigger.md", heading: "Kontext" },
      edges1,
      templatesConfig,
      mockChainRoles,
      mockEdgeVocabulary,
      { includeNoteLinks: true, includeCandidates: false }
    );

    const matches2 = await matchTemplates(
      mockApp,
      { file: "Tests/01_experience_trigger.md", heading: "Kontext" },
      edges2,
      templatesConfig,
      mockChainRoles,
      mockEdgeVocabulary,
      { includeNoteLinks: true, includeCandidates: false }
    );

    expect(matches1.length).toBe(matches2.length);
    if (matches1.length > 0 && matches2.length > 0) {
      expect(matches1[0]?.templateName).toBe(matches2[0]?.templateName);
      expect(matches1[0]?.score).toBe(matches2[0]?.score);
      expect(matches1[0]?.missingSlots).toEqual(matches2[0]?.missingSlots);
    }
  });
});