import { cleanUpSvgCode, isMermaidCodeComplete, prepareMermaidCode, processSvgForTheme, sanitizeMermaidCode, svgToBase64, waitForDOMElement } from '../utils'

const FILL_HEX_RE = /fill="#[a-fA-F0-9]{6}"/g

describe('cleanUpSvgCode', () => {
  it('should replace old-style <br> tags with self-closing <br/>', () => {
    const result = cleanUpSvgCode('<br>test<br>')
    expect(result).toEqual('<br/>test<br/>')
  })
})

describe('sanitizeMermaidCode', () => {
  describe('Edge Cases', () => {
    it('should handle null/non-string input', () => {
      // @ts-expect-error need to test null input
      expect(sanitizeMermaidCode(null)).toBe('')
      // @ts-expect-error need to test undefined input
      expect(sanitizeMermaidCode(undefined)).toBe('')
      // @ts-expect-error need to test non-string input
      expect(sanitizeMermaidCode(123)).toBe('')
    })
  })

  describe('Security', () => {
    it('should remove click directives to prevent link/callback injection', () => {
      const unsafeProtocol = ['java', 'script:'].join('')
      const input = [
        'gantt',
        'title Demo',
        'section S1',
        'Task 1 :a1, 2020-01-01, 1d',
        `click A href "${unsafeProtocol}alert(location.href)"`,
        'click B call callback()',
      ].join('\n')

      const result = sanitizeMermaidCode(input)

      expect(result).toContain('gantt')
      expect(result).toContain('Task 1')
      expect(result).not.toContain('click A')
      expect(result).not.toContain('click B')
      expect(result).not.toContain(unsafeProtocol)
    })

    it('should remove Mermaid init directives to prevent config overrides', () => {
      const input = [
        '%%{init: {"securityLevel":"loose"}}%%',
        'graph TD',
        'A-->B',
      ].join('\n')

      const result = sanitizeMermaidCode(input)

      expect(result).toEqual(['graph TD', 'A-->B'].join('\n'))
    })
  })
})

describe('prepareMermaidCode', () => {
  describe('Edge Cases', () => {
    it('should handle null/non-string input', () => {
      // @ts-expect-error need to test null input
      expect(prepareMermaidCode(null, 'classic')).toBe('')
    })
  })

  describe('Sanitization', () => {
    it('should sanitize click directives in flowcharts', () => {
      const unsafeProtocol = ['java', 'script:'].join('')
      const input = [
        'graph TD',
        'A[Click]-->B',
        `click A href "${unsafeProtocol}alert(1)"`,
      ].join('\n')

      const result = prepareMermaidCode(input, 'classic')

      expect(result).toContain('graph TD')
      expect(result).not.toContain('click ')
      expect(result).not.toContain(unsafeProtocol)
    })

    it('should replace <br> with newline', () => {
      const input = 'graph TD\nA[Node<br>Line]-->B'
      const result = prepareMermaidCode(input, 'classic')
      expect(result).toContain('Node\nLine')
    })
  })

  describe('HandDrawn Style', () => {
    it('should handle handDrawn style specifically', () => {
      const input = 'flowchart TD\nstyle A fill:#fff\nlinkStyle 0 stroke:#000\nA-->B'
      const result = prepareMermaidCode(input, 'handDrawn')
      expect(result).toContain('graph TD')
      expect(result).not.toContain('style ')
      expect(result).not.toContain('linkStyle ')
      expect(result).toContain('A-->B')
    })

    it('should add TD fallback for handDrawn if missing', () => {
      const input = 'A-->B'
      const result = prepareMermaidCode(input, 'handDrawn')
      expect(result).toBe('graph TD\nA-->B')
    })
  })
})

describe('svgToBase64', () => {
  describe('Rendering', () => {
    it('should return empty string for empty input', async () => {
      expect(await svgToBase64('')).toBe('')
    })

    it('should convert svg to base64', async () => {
      const svg = '<svg>test</svg>'
      const result = await svgToBase64(svg)
      expect(result).toContain('base64,')
      expect(result).toContain('image/svg+xml')
    })

    it('should convert svg with xml declaration to base64', async () => {
      const svg = '<?xml version="1.0" encoding="UTF-8"?><svg>test</svg>'
      const result = await svgToBase64(svg)
      expect(result).toContain('base64,')
      expect(result).toContain('image/svg+xml')
    })
  })

  describe('Edge Cases', () => {
    it('should handle errors gracefully', async () => {
      const encoderSpy = vi.spyOn(globalThis, 'TextEncoder').mockImplementation(() => ({
        encoding: 'utf-8',
        encode: () => { throw new Error('Encoder fail') },
        encodeInto: () => ({ read: 0, written: 0 }),
      } as unknown as TextEncoder))

      const result = await svgToBase64('<svg>fail</svg>')
      expect(result).toBe('')

      encoderSpy.mockRestore()
    })
  })
})

describe('processSvgForTheme', () => {
  const themes = {
    light: {
      nodeColors: [{ bg: '#fefefe' }, { bg: '#eeeeee' }],
      connectionColor: '#cccccc',
    },
    dark: {
      nodeColors: [{ bg: '#121212' }, { bg: '#222222' }],
      connectionColor: '#333333',
    },
  }

  describe('Light Theme', () => {
    it('should process light theme node colors', () => {
      const svg = '<rect fill="#ffffff" class="node-1"/>'
      const result = processSvgForTheme(svg, false, false, themes)
      expect(result).toContain('fill="#fefefe"')
    })

    it('should process handDrawn style for light theme', () => {
      const svg = '<path fill="#ffffff" stroke="#ffffff"/>'
      const result = processSvgForTheme(svg, false, true, themes)
      expect(result).toContain('fill="#fefefe"')
      expect(result).toContain('stroke="#cccccc"')
    })
  })

  describe('Dark Theme', () => {
    it('should process dark theme node colors and general elements', () => {
      const svg = '<rect fill="#ffffff" class="node-1"/><path stroke="#ffffff"/><rect fill="#ffffff" style="fill: #000000; stroke: #000000"/>'
      const result = processSvgForTheme(svg, true, false, themes)
      expect(result).toContain('fill="#121212"')
      expect(result).toContain('fill="#1e293b"') // Generic rect replacement
      expect(result).toContain('stroke="#333333"')
    })

    it('should handle multiple node colors in cyclic manner', () => {
      const svg = '<rect fill="#ffffff" class="node-1"/><rect fill="#ffffff" class="node-2"/><rect fill="#ffffff" class="node-3"/>'
      const result = processSvgForTheme(svg, true, false, themes)
      const fillMatches = result.match(FILL_HEX_RE)
      expect(fillMatches).toContain('fill="#121212"')
      expect(fillMatches).toContain('fill="#222222"')
      expect(fillMatches?.filter(f => f === 'fill="#121212"').length).toBe(2)
    })

    it('should process handDrawn style for dark theme', () => {
      const svg = '<path fill="#ffffff" stroke="#ffffff"/>'
      const result = processSvgForTheme(svg, true, true, themes)
      expect(result).toContain('fill="#121212"')
      expect(result).toContain('stroke="#333333"')
    })
  })
})

describe('isMermaidCodeComplete', () => {
  describe('Edge Cases', () => {
    it('should return false for empty input', () => {
      expect(isMermaidCodeComplete('')).toBe(false)
      expect(isMermaidCodeComplete('   ')).toBe(false)
    })

    it('should detect common syntax errors', () => {
      expect(isMermaidCodeComplete('graph TD\nA--> undefined')).toBe(false)
      expect(isMermaidCodeComplete('graph TD\nA--> [object Object]')).toBe(false)
      expect(isMermaidCodeComplete('graph TD\nA-->')).toBe(false)
    })

    it('should handle validation error gracefully', () => {
      const consoleSpy = vi.spyOn(console, 'error').mockImplementation(() => { })
      const startsWithSpy = vi.spyOn(String.prototype, 'startsWith').mockImplementation(() => {
        throw new Error('Start fail')
      })

      expect(isMermaidCodeComplete('graph TD')).toBe(false)
      expect(consoleSpy).toHaveBeenCalledWith('Mermaid code validation error:', expect.any(Error))

      startsWithSpy.mockRestore()
      consoleSpy.mockRestore()
    })
  })

  describe('Chart Types', () => {
    it('should validate gantt charts', () => {
      expect(isMermaidCodeComplete('gantt\ntitle T\nsection S\nTask')).toBe(true)
      expect(isMermaidCodeComplete('gantt\ntitle T')).toBe(false)
    })

    it('should validate mindmaps', () => {
      expect(isMermaidCodeComplete('mindmap\nroot')).toBe(true)
      expect(isMermaidCodeComplete('mindmap')).toBe(false)
    })

    it('should validate other chart types', () => {
      expect(isMermaidCodeComplete('graph TD\nA-->B')).toBe(true)
      expect(isMermaidCodeComplete('pie title P\n"A": 10')).toBe(true)
      expect(isMermaidCodeComplete('invalid chart')).toBe(false)
    })
  })
})

describe('waitForDOMElement', () => {
  it('should resolve when callback resolves', async () => {
    const cb = vi.fn().mockResolvedValue('success')
    const result = await waitForDOMElement(cb)
    expect(result).toBe('success')
    expect(cb).toHaveBeenCalledTimes(1)
  })

  it('should retry on failure', async () => {
    const cb = vi.fn()
      .mockRejectedValueOnce(new Error('fail'))
      .mockResolvedValue('success')
    const result = await waitForDOMElement(cb, 3, 10)
    expect(result).toBe('success')
    expect(cb).toHaveBeenCalledTimes(2)
  })

  it('should reject after max attempts', async () => {
    const cb = vi.fn().mockRejectedValue(new Error('fail'))
    await expect(waitForDOMElement(cb, 2, 10)).rejects.toThrow('fail')
    expect(cb).toHaveBeenCalledTimes(2)
  })
})