package command

import (
    "os"
    "path/filepath"
    "testing"
)

func TestParseCustomCommand(t *testing.T) {
    tests := []struct {
        name    string
        content string
        wantOK  bool
        wantCmd CustomCommand
    }{
        {
            name: "valid command",
            content: `---
name: review
description: Code review prompt
---
Review this code: {{input}}`,
            wantOK: true,
            wantCmd: CustomCommand{
                Name:        "review",
                Description: "Code review prompt",
                Template:    "Review this code: {{input}}",
            },
        },
        {
            name: "no description",
            content: `---
name: explain
---
Explain this: {{input}}`,
            wantOK: true,
            wantCmd: CustomCommand{
                Name:     "explain",
                Template: "Explain this: {{input}}",
            },
        },
        {
            name:    "no frontmatter",
            content: "just some text",
            wantOK:  false,
        },
        {
            name: "no name",
            content: `---
description: something
---
body`,
            wantOK: false,
        },
        {
            name: "no body",
            content: `---
name: empty
---`,
            wantOK: false,
        },
    }

    for _, tt := range tests {
        t.Run(tt.name, func(t *testing.T) {
            cmd, ok := parseCustomCommand(tt.content)
            if ok != tt.wantOK {
                t.Fatalf("parseCustomCommand() ok = %v, want %v", ok, tt.wantOK)
            }
            if !ok {
                return
            }
            if cmd.Name != tt.wantCmd.Name {
                t.Errorf("Name = %q, want %q", cmd.Name, tt.wantCmd.Name)
            }
            if cmd.Description != tt.wantCmd.Description {
                t.Errorf("Description = %q, want %q", cmd.Description, tt.wantCmd.Description)
            }
            if cmd.Template != tt.wantCmd.Template {
                t.Errorf("Template = %q, want %q", cmd.Template, tt.wantCmd.Template)
            }
        })
    }
}

func TestLoadCustomCommands(t *testing.T) {
    dir := t.TempDir()

    // Write a valid command file.
    err := os.WriteFile(filepath.Join(dir, "review.md"), []byte(`---
name: review
description: Review code
---
Review: {{input}}`), 0o644)
    if err != nil {
        t.Fatal(err)
    }

    // Write an invalid file (no frontmatter).
    err = os.WriteFile(filepath.Join(dir, "invalid.md"), []byte("just text"), 0o644)
    if err != nil {
        t.Fatal(err)
    }

    // Write a non-md file (should be ignored).
    err = os.WriteFile(filepath.Join(dir, "notes.txt"), []byte("not a command"), 0o644)
    if err != nil {
        t.Fatal(err)
    }

    cmds := LoadCustomCommands(dir)
    if len(cmds) != 1 {
        t.Fatalf("LoadCustomCommands() returned %d commands, want 1", len(cmds))
    }
    if cmds[0].Name != "review" {
        t.Errorf("Name = %q, want %q", cmds[0].Name, "review")
    }
}

func TestLoadCustomCommands_MissingDir(t *testing.T) {
    cmds := LoadCustomCommands("/nonexistent/path")
    if len(cmds) != 0 {
        t.Errorf("expected empty result for missing dir, got %d", len(cmds))
    }
}

func TestRegisterCustomCommands(t *testing.T) {
    dir := t.TempDir()
    err := os.WriteFile(filepath.Join(dir, "test.md"), []byte(`---
name: testcmd
description: A test command
---
Do this: {{input}}`), 0o644)
    if err != nil {
        t.Fatal(err)
    }

    reg := NewRegistry()
    RegisterCustomCommands(reg, dir)

    result := reg.Execute(&Context{}, "testcmd", []string{"hello", "world"})
    if result.Action != ActionSendPrompt {
        t.Errorf("Action = %v, want ActionSendPrompt", result.Action)
    }
    if result.Data != "Do this: hello world" {
        t.Errorf("Data = %q, want %q", result.Data, "Do this: hello world")
    }
}